Squashed 'third_party/allwpilib/' changes from 66b57f032..e473a00f9

e473a00f9 [wpiutil] Base64: Add unsigned span/vector variants (#3702)
52f2d580e [wpiutil] raw_uv_ostream: Add reset() (#3701)
d7b1e3576 [wpiutil] WebSocket: move std::function (#3700)
93799fbe9 [examples] Fix description of TrapezoidProfileSubsystem (#3699)
b84644740 [wpimath] Document pose estimator states, inputs, and outputs (#3698)
2dc35c139 [wpimath] Fix classpaths for JNI class loads (#3697)
2cb171f6f [docs] Set Doxygen extract_all to true and fix Doxygen failures (#3695)
a939cd9c8 [wpimath] Print uncontrollable/unobservable models in LQR and KF (#3694)
d5270d113 [wpimath] Clean up C++ StateSpaceUtil tests (#3692)
b20903960 [wpimath] Remove redundant discretization tests from StateSpaceUtilTest (#3689)
c0cb545b4 [wpilibc] Add deprecated Doxygen attribute to SpeedController (#3691)
35c9f66a7 [wpilib] Rename PneumaticsHub to PneumaticHub (#3686)
796d03d10 [wpiutil] Remove unused LLVM header (#3688)
8723caf78 [wpilibj] Make Java TrapezoidProfile.Constraints an immutable class (#3687)
187f50a34 [wpimath] Catch incorrect parameters to state-space models earlier (#3680)
8d04606c4 Replace instances of frc-characterization with SysId (NFC) (#3681)
b82d4f6e5 [hal, cscore, ntcore] Use WPI common handle type base
87e34967e [wpiutil] Add synchronization primitives
e32499c54 [wpiutil] Add ParallelTcpConnector (#3655)
aa0b49228 [wpilib] Remove redundant "quick turn" docs for curvature drive (NFC) (#3674)
57301a7f9 [hal] REVPH: Start closed-loop compressor control on init (#3673)
d1842ea8f [wpilib] Improve interrupt docs (NFC) (#3679)
558151061 [wpiutil] Add DsClient (#3654)
181723e57 Replace `.to<double>()` and `.template to<double>()` with `.value()` (#3667)
6bc1db44b [commands] Add pointer overload of AddRequirements (artf6003) (#3669)
737b57ed5 [wpimath] Update to drake v0.35.0 (#3665)
4d287d1ae [build] Upgrade WPIJREArtifact to JRE 2022-11.0.12u5 (#3666)
f26eb5ada [hal] Fix another typo (get -> gets) (NFC) (#3663)
94ed275ba [hal] Fix misspelling (numer -> number) (NFC) (#3662)
ac2f44da3 [wpiutil] uv: use move for std::function (#3653)
75fa1fbfb [wpiutil] json::serializer: Optimize construction (#3647)
5e689faea [wpiutil] Import MessagePack implementation (mpack) (#3650)
649a50b40 [wpiutil] Add LEB128 byte-by-byte reader (#3652)
e94397a97 [wpiutil] Move json_serializer.h to public headers (#3646)
4ec58724d [wpiutil] uv::Tcp: Clarify SetNoDelay documentation (#3649)
8cb294aa4 [wpiutil] WebSocket: Make Shutdown() public (#3651)
2b3a9a52b [wpiutil] json: Fix map iterator key() for std::string_view (#3645)
138cbb94b [wpiutil] uv::Async: Add direct call for no-parameter specialization (#3648)
e56d6dea8 [ci] Update testbench pool image to ubuntu-latest (#3643)
43f30e44e [build] Enable comments in doxygen source files (#3644)
9e6db17ef [build] Enable doxygen preprocessor expansion of WPI_DEPRECATED (#3642)
0e631ad2f Add WPILib version to issue template (#3641)
6229d8d2f [build] Docs: set case_sense_names to false (#3392)
4647d09b5 [docs] Fix Doxygen warnings, add CI docs lint job (#3639)
4ad3a5402 [hal] Fix PWM allocation channel (#3637)
05e5feac4 [docs] Fix brownout docs (NFC) (#3638)
67df469c5 [examples] Remove old command-based templates and examples (#3263)
689e9ccfb [hal, wpilib] Add brownout voltage configuration (#3632)
9cd4bc407 [docs] Add useLocal to avoid using installer artifacts (#3634)
61996c2bb [cscore] Fix Java direct callback notifications (#3631)
6d3dd99eb [build] Update to newest native-utils (#3633)
f0b484892 [wpiutil] Fix StringMap iterator equality check (#3629)
8352cbb7a Update development build instructions for 2022 (#3616)
6da08b71d [examples] Fix Intermediate Vision Java Example description (#3628)
5d99059bf [wpiutil] Remove optional.h (#3627)
fa41b106a [glass, wpiutil] Add missing format args (#3626)
4e3fd7d42 [build] Enable Zc:__cplusplus for Windows (#3625)
791d8354d [build] Suppress deprecation/removal warnings for old commands (#3618)
10f19e6fc [hal, wpilib] Add REV PneumaticsHub (#3600)
4c61a1305 [ntcore] Revert to per-element copy for toNative() (#3621)
7b3f62244 [wpiutil] SendableRegistry: Print exception stacktrace (#3620)
d347928e4 [hal] Use better error for when console out is enabled while attempting to use onboard serial port (#3622)
cc31079a1 [hal] Use setcap instead of setuid for setting thread priorities (#3613)
4676648b7 [wpimath] Upgrade to Drake v0.34.0 (#3607)
c7594c911 [build] Allow building wpilibc in cmake without cscore and opencv (#3605)
173cb7359 [wpilib] Add TimesliceRobot (#3502)
af295879f [hal] Set error status for I2C port out of range (#3603)
95dd20a15 [build] Enable spotbugs (#3601)
b65fce86b [wpilib] Remove Timer lock in wpilibj and update docs (#3602)
3b8d3bbcb Remove unused and add missing deprecated.h includes (#3599)
f9e976467 [examples] Rename DriveTrain classes to Drivetrain (#3594)
118a27be2 [wpilib] Add Timer tests (#3595)
59c89428e [wpilib] Deprecate Timer::HasPeriodPassed() (#3598)
202ca5e78 Force C++17 in .clang-format (#3597)
d6f185d8e Rename tests for consistency (#3592)
54ca474db [ci] Enable asan and tsan in CI for tests that pass (#3591)
1ca383b23 Add Debouncer (#3590)
179fde3a7 [build] Update to 2022 native utils and gradle 7 (#3588)
50198ffcf [examples] Add Mechanism2d visualization to Elevator Sim (#3587)
a446c2559 [examples] Synchronize C++ and Java Mechanism2d examples (#3589)
a7fb83103 [ci] clang-tidy: Generate compilation commands DB with Gradle (#3585)
4f5e0c9f8 [examples] Update ArmSimulation example to use Mechanism2d (#3572)
8164b91dc [CI] Print CMake test output on failure (#3583)
4d5fca27e [wpilib] Impove Mechanism2D documentation (NFC) (#3584)
fe59e4b9f Make C++ test names more consistent (#3586)
5c8868549 [wpilibc] Fix C++ MechanisimRoot2D to use same NT entries as Java/Glass (#3582)
9359431ba [wpimath] Clean up Eigen usage
72716f51c [wpimath] Upgrade to Eigen 3.4
382deef75 [wpimath] Explicitly export wpimath symbols
161e21173 [ntcore] Match standard handle layout, only allow 16 instances (#3577)
263a24811 [wpimath] Use jinja for codegen (#3574)
725251d29 [wpilib] Increase tolerances of DifferentialDriveSimTest (#3581)
4dff87301 [wpimath] Make LinearFilter::Factorial() constexpr (#3579)
60ede67ab [hal, wpilib] Switch PCM to be a single object that is allowed to be duplicated (#3475)
906bfc846 [build] Add CMake build support for sanitizers (#3576)
0d4f08ad9 [hal] Simplify string copy of joystick name (#3575)
a52bf87b7 [wpiutil] Add Java function package (#3570)
40c7645d6 [wpiutil] UidVector: Return old object from erase() (#3571)
5b886a23f [wpiutil] jni_util: Add size, operator[] to JArrayRef (#3569)
65797caa7 [sim] Fix halsim_ds_socket stringop overflow warning from GCC 10 (#3568)
66abb3988 [hal] Update runtime enum to allow selecting roborio 2 (#3565)
95a12e0ee [hal] UidSetter: Don't revert euid if its already current value (#3566)
27951442b [wpimath] Use external Eigen headers only (#3564)
c42e053ae [docs] Update to doxygen 1.9.2 (#3562)
e7048c8c8 [docs] Disable doxygen linking for common words that are also classes (#3563)
d8e0b6c97 [wpilibj] Fix java async interrupts (#3559)
5e6c34c61 Update to 2022 roborio image (#3537)
828f073eb [wpiutil] Fix uv::Buffer memory leaks caught by asan (#3555)
2dd5701ac [cscore] Fix mutex use-after-free in cscore test (#3557)
531439198 [ntcore] Fix NetworkTables memory leaks caught by asan (#3556)
3d9a4d585 [wpilibc] Fix AnalogTriggerOutput memory leak reported by asan (#3554)
54eda5928 [wpiutil] Ignore ubsan vptr upcast warning in SendableHelper moves (#3553)
5a4f75c9f [wpilib] Replace Speed controller comments with motor controller (NFC) (#3551)
7810f665f [wpiutil] Fix bug in uleb128 (#3540)
697e2dd33 [wpilib] Fix errant jaguar reference in comments (NFC) (#3550)
936c64ff5 [docs] Enable -linksource for javadocs (#3549)
1ea654954 [build] Upgrade CMake build to googletest 1.11.0 (#3548)
32d9949e4 [wpimath] Move controller tests to wpimath (#3541)
01ba56a8a [hal] Replace strncpy with memcpy (#3539)
e109c4251 [build] Rename makeSim flag to forceGazebo to better describe what it does (#3535)
e4c709164 [docs] Use a doxygen theme and add logo (#3533)
960b6e589 [wpimath] Fix Javadoc warning (#3532)
82eef8d5e [hal] Remove over current fault HAL functions from REV PDH (#3526)
aa3848b2c [wpimath] Move RobotDriveBase::ApplyDeadband() to MathUtil (#3529)
3b5d0d141 [wpimath] Add LinearFilter::BackwardFiniteDifference() (#3528)
c8fc715fe [wpimath] Upgrade drake files to v0.33.0 (#3531)
e5fe3a8e1 [build] Treat javadoc warnings as errors in CI and fix warnings (#3530)
e0c6cd3dc [wpimath] Add an operator for composing two Transform2ds (#3527)
2edd510ab [sim] Add sim wrappers for sensors that use SimDevice (#3517)
2b3e2ebc1 [hal] Fix HAL Notifier thread priority setting (#3522)
ab4cb5932 [gitignore] Update gitignore to ignore bazel / clion files (#3524)
57c8615af [build] Generate spotless patch on failure (#3523)
b90317321 Replace std::cout and std::cerr with fmt::print() (#3519)
10cc8b89c [hal] [wpilib] Add initial support for the REV PDH (#3503)
5d9ae3cdb [hal] Set HAL Notifier thread as RT by default (#3482)
192d251ee [wpilibcIntegrationTests] Properly disable DMA integration tests (#3514)
031962608 [wpilib] Add PS4Controller, remove Hand from GenericHID/XboxController (#3345)
25f6f478a [wpilib] Rename DriverStation::IsOperatorControl() to IsTeleop() (#3505)
e80f09f84 [wpilibj] Add unit tests (#3501)
c159f91f0 [wpilib] Only read DS control word once in IterativeRobotBase (#3504)
eb790a74d Add rio development docs documenting myRobot deploy tasks (#3508)
e47451f5a [wpimath] Replace auto with Eigen types (#3511)
252b8c83b Remove Java formatting from build task in CI (#3507)
09666ff29 Shorten Gazebo CI build (#3506)
baf2e501d Update myRobot to use 2021 java (#3509)
5ac60f0a2 [wpilib] Remove IterativeRobotBase mode init prints (#3500)
fb2ee8ec3 [wpilib] Add TimedRobot functions for running code on mode exit (#3499)
94e0db796 [wpilibc] Add more unit tests (#3494)
b25324695 [wpilibj] Add units to parameter names (NFC) (#3497)
1ac73a247 [hal] Rename PowerDistributionPanel to PowerDistribution (#3466)
2014115bc [examples] frisbeebot: Fix typo and reflow comments (NFC) (#3498)
4a944dc39 [examples] Consistently use 0 for controller port (#3496)
3838cc4ec Use unicode characters in docs equations (#3487)
85748f2e6 [examples] Add C++ TankDrive example (#3493)
d7b8aa56d [wpilibj] Rename DriverStation In[Mode] functions to follow style guide (#3488)
16e096cf8 [build] Fix CMake Windows CI (#3490)
50af74c38 [wpimath] Clean up NumericalIntegration and add Discretization tests (#3489)
bfc209b12 Automate fmt update (#3486)
e7f9331e4 [build] Update to Doxygen 1.9.1 (#3008)
ab8e8aa2a [wpimath] Update drake with upstream (#3484)
1ef826d1d [wpimath] Fix IOException path in WPIMath JNI (#3485)
52bddaa97 [wpimath] Disable iostream support for units and enable fmtlib (#3481)
e4dc3908b [wpiutil] Upgrade to fmtlib 8.0.1 (#3483)
1daadb812 [wpimath] Implement Dormand-Prince integration method (#3476)
9c2723391 [cscore] Add [[nodiscard]] to GrabFrame functions (#3479)
7a8796414 [wpilib] Add Notifier integration tests (#3480)
f8f13c536 [wpilibcExamples] Prefix decimal numbers with 0 (#3478)
1adb69c0f [ntcore] Use "NetworkTables" instead of "Network Tables" in NT specs (#3477)
5f5830b96 Upload wpiformat diff if one exists (#3474)
9fb4f35bb [wpimath] Add tests for DARE overload with Q, R, and N matrices (#3472)
c002e6f92 Run wpiformat (#3473)
c154e5262 [wpilib] Make solenoids exclusive use, PCM act like old sendable compressor (#3464)
6ddef1cca [hal] JNI setDIO: use a boolean and not a short (#3469)
9d68d9582 Remove extra newlines after open curly braces (NFC) (#3471)
a4233e1a1 [wpimath] Add script for updating Drake (#3470)
39373c6d2 Update README.md for new GCC version requirement (#3467)
d29acc90a [wpigui] Add option to reset UI on exit (#3463)
a371235b0 [ntcore] Fix dangling pointer in logger (#3465)
53b4891a5 [wpilibcintegrationtests] Fix deprecated Preferences usage (#3461)
646ded912 [wpimath] Remove incorrect discretization in pose estimators (#3460)
ea0b8f48e Fix some deprecation warnings due to fmtlib upgrade (#3459)
2067d7e30 [wpilibjexamples] Add wpimathjni, wpiutiljni to library path (#3455)
866571ab4 [wpiutil] Upgrade to fmtlib 8.0.0 (#3457)
4e1fa0308 [build] Skip PDB copy on windows build servers (#3458)
b45572167 [build] Change CI back to 18.04 docker images (#3456)
57a160f1b [wpilibc] Fix LiveWindow deprecation warning in RobotBase skeleton template (#3454)
29ae8640d [HLT] Implement duty cycle cross connect tests (#3453)
ee6377e54 [HLT] Add relay and analog cross connects (#3452)
b0f1ae7ea [build] CMake: Build the HAL even if WITH_CSCORE=OFF (#3449)
7aae2b72d Replace std::to_string() with fmt::format() (#3451)
73fcbbd74 [HLT] Add relay digital cross connect tests (#3450)
e7bedde83 [HLT] Add PWM tests that use DMA as the back end (#3447)
7253edb1e [wpilibc] Timer: Fix deprecated warning (#3446)
efa28125c [wpilibc] Add message to RobotBase on how to read stacktrace (#3444)
9832fcfe1 [hal] Fix DIO direction getter (#3445)
49c71f9f2 [wpilibj] Clarify robot quit message (#3364)
791770cf6 [wpimath] Move controller from wpilibj to wpimath (#3439)
9ce9188ff [wpimath] Add ReportWarning to MathShared (#3441)
362066a9b [wpilib] Deprecate getInstance() in favor of static functions (#3440)
26ff9371d Initial commit of cross connect integration test project (#3434)
4a36f86c8 [hal] Add support for DMA to Java (#3158)
85144e47f [commands] Unbreak build (#3438)
b417d961e Split Sendable into NT and non-NT portions (#3432)
ef4ea84cb [commands] Change grouping decorator impl to flatten nested group structures (#3335)
b422665a3 [examples] Invert right side of drive subsystems (#3437)
186dadf14 [hal] Error if attempting to set DIO output on an input port (#3436)
04e64db94 Remove redundant C++ lambda parentheses (NFC) (#3433)
f60994ad2 [wpiutil] Rename Java package to edu.wpi.first.util (#3431)
cfa1ca96f [wpilibc] Make ShuffleboardValue non-copyable (#3430)
4d9ff7643 Fix documentation warnings generated by JavaDoc (NFC) (#3428)
9e1b7e046 [build] Fix clang-tidy and clang-format (#3429)
a77c6ff3a [build] Upgrade clang-format and clang-tidy (NFC) (#3422)
099fde97d [wpilib] Improve PDP comments (NFC) (#3427)
f8fc2463e [wpilibc, wpiutil] Clean up includes (NFC) (#3426)
e246b7884 [wpimath] Clean up member initialization in feedforward classes (#3425)
c1e128bd5 Disable frivolous PMD warnings and enable PMD in ntcore (#3419)
8284075ee Run "Lint and Format" CI job on push as well as pull request (#3412)
f7db09a12 [wpimath] Move C++ filters into filter folder to match Java (#3417)
f9c3d54bd [wpimath] Reset error covariance in pose estimator ResetPosition() (#3418)
0773f4033 [hal] Ensure HAL status variables are initialized to zero (#3421)
d068fb321 [build] Upgrade CI to use 20.04 docker images (#3420)
8d054c940 [wpiutil] Remove STLExtras.h
80f1d7921 [wpiutil] Split function_ref to a separate header
64f541325 Use wpi::span instead of wpi::ArrayRef across all libraries (#3414)
2abbbd9e7 [build] clang-tidy: Remove bugprone-exception-escape (#3415)
a5c471af7 [wpimath] Add LQR template specialization for 2x2 system
edd2f0232 [wpimath] Add DARE solver for Q, R, and N with LQR ctor overloads
b2c3b2dd8 Use std::string_view and fmtlib across all libraries (#3402)
4f1cecb8e [wpiutil] Remove Path.h (#3413)
b336eac34 [build] Publish halsim_ws_core to Maven
2a09f6fa4 [build] Also build sim modules as static libraries
0e702eb79 [hal] Add a unified PCM object (#3331)
dea841103 [wpimath] Add fmtlib formatter overloads for Eigen::Matrix and units (#3409)
82856cf81 [wpiutil] Improve wpi::circular_buffer iterators (#3410)
8aecda03e [wpilib] Fix a documentation typo (#3408)
5c817082a [wpilib] Remove InterruptableSensorBase and replace with interrupt classes (#2410)
15c521a7f [wpimath] Fix drivetrain system identification (#3406)
989de4a1b [build] Force all linker warnings to be fatal for rio builds (#3407)
d9eeb45b0 [wpilibc] Add units to Ultrasonic class API (#3403)
fe570e000 [wpiutil] Replace llvm filesystem with C++17 filesystem (#3401)
01dc0249d [wpimath] Move SlewRateLimiter from wpilib to wpimath (#3399)
93523d572 [wpilibc] Clean up integration tests (#3400)
4f7a4464d [wpiutil] Rewrite StringExtras for std::string_view (#3394)
e09293a15 [wpilibc] Transition C++ classes to units::second_t (#3396)
827b17a52 [build] Create run tasks for Glass and OutlineViewer (#3397)
a61037996 [wpiutil] Avoid MSVC warning on span include (#3393)
4e2c3051b [wpilibc] Use std::string_view instead of Twine (#3380)
50915cb7e [wpilibc] MotorSafety::GetDescription(): Return std::string (#3390)
f4e2d26d5 [wpilibc] Move NullDeleter from frc/Base.h to wpi/NullDeleter.h (#3387)
cb0051ae6 [wpilibc] SimDeviceSim: use fmtlib (#3389)
a238cec12 [wpiutil] Deprecate wpi::math constants in favor of wpi::numbers (#3383)
393bf23c0 [ntcore, cscore, wpiutil] Standardize template impl files on .inc extension (NFC) (#3124)
e7d9ba135 [sim] Disable flaky web server integration tests (#3388)
0a0003c11 [wpilibjExamples] Fix name of Java swerve drive pose estimator example (#3382)
7e1b27554 [wpilibc] Use default copies and moves when possible (#3381)
fb2a56e2d [wpilibc] Remove START_ROBOT_CLASS macro (#3384)
84218bfb4 [wpilibc] Remove frc namespace shim (#3385)
dd7824340 [wpilibc] Remove C++ compiler version static asserts (#3386)
484cf9c0e [wpimath] Suppress the -Wmaybe-uninitialized warning in Eigen (#3378)
a04d1b4f9 [wpilibc] DriverStation: Remove ReportError and ReportWarning
831c10bdf [wpilibc] Errors: Use fmtlib
87603e400 [wpiutil] Import fmtlib (#3375)
442621672 [wpiutil] Add ArrayRef/std::span/wpi::span implicit conversions
bc15b953b [wpiutil] Add std::span implementation
6d20b1204 [wpiutil] StringRef, Twine, raw_ostream: Add std::string_view support (#3373)
2385c2a43 [wpilibc] Remove Utility.h (#3376)
87384ea68 [wpilib] Fix PIDController continuous range error calculations (#3170)
04dae799a [wpimath] Add SimpleMotorFeedforward::Calculate(velocity, nextVelocity) overload (#3183)
0768c3903 [wpilib] DifferentialDrive: Remove right side inversion (#3340)
8dd8d4d2d [wpimath] Fix redundant nested math package introduced by #3316 (#3368)
49b06beed [examples] Add Field2d to RamseteController example (#3371)
4c562a445 [wpimath] Fix typo in comment of update_eigen.py (#3369)
fdbbf1188 [wpimath] Add script for updating Eigen
f1e64b349 [wpimath] Move Eigen unsupported folder into eigeninclude
224f3a05c [sim] Fix build error when building with GCC 11.1 (#3361)
ff56d6861 [wpilibj] Fix SpeedController deprecated warnings (#3360)
1873fbefb [examples] Fix Swerve and Mecanum examples (#3359)
80b479e50 [examples] Fix SwerveBot example to use unique encoder ports (#3358)
1f7c9adee [wpilibjExamples] Fix pose estimator examples (#3356)
9ebc3b058 [outlineviewer] Change default size to 600x400 (#3353)
e21b443a4 [build] Gradle: Make C++ examples runnable (#3348)
da590120c [wpilibj] Add MotorController.setVoltage default (#3347)
561d53885 [build] Update opencv to 4.5.2, imgui/implot to latest (#3344)
44ad67ca8 [wpilibj] Preferences: Add missing Deprecated annotation (#3343)
3fe8fc75a [wpilibc] Revert "Return reference from GetInstance" (#3342)
3cc2da332 Merge branch '2022'
a3cd90dd7 [wpimath] Fix classpath used by generate_numbers.py (#3339)
d6cfdd3ba [wpilib] Preferences: Deprecate Put* in favor of Set* (#3337)
ba08baabb [wpimath] Update Drake DARE solver to v0.29.0 (#3336)
497b712f6 [wpilib] Make IterativeRobotBase::m_period private with getter
f00dfed7a [wpilib] Remove IterativeRobot base class
3c0846168 [hal] Use last error reporting instead of PARAMETER_OUT_OF_RANGE (#3328)
5ef2b4fdc [wpilibj] Fix @deprecated warning for SerialPort constructor (#3329)
23d2326d1 [hal] Report previous allocation location for indexed resource duplicates (#3322)
e338f9f19 [build] Fix wpilibc runCpp task (#3327)
c8ff626fe [wpimath] Move Java classes to edu.wpi.first.math (#3316)
4e424d51f [wpilibj] DifferentialDrivetrainSim: Rename constants to match the style guide (#3312)
6b50323b0 [cscore] Use Lock2DSize if possible for Windows USB cameras (#3326)
65c148536 [wpilibc] Fix "control reaches end of non-void function" warning (#3324)
f99f62bee [wpiutil] uv Handle: Use malloc/free instead of new/delete (#3325)
365f5449c [wpimath] Fix MecanumDriveKinematics (#3266)
ff52f207c [glass, wpilib] Rewrite Mechanism2d (#3281)
ee0eed143 [wpimath] Add DCMotor factory function for Romi motors (#3319)
512738072 [hal] Add HAL_GetLastError to enable better error messages from HAL calls (#3320)
ced654880 [glass, outlineviewer] Update Mac icons to macOS 11 style (#3313)
936d3b9f8 [templates] Add Java template for educational robot (#3309)
6e31230ad [examples] Fix odometry update in SwerveControllerCommand example (#3310)
05ebe9318 Merge branch 'main' into 2022
aaf24e255 [wpilib] Fix initial heading behavior in HolonomicDriveController (#3290)
8d961dfd2 [wpilibc] Remove ErrorBase (#3306)
659b37ef9 [wpiutil] StackTrace: Include offset on Linux (#3305)
0abf6c904 [wpilib] Move motor controllers to motorcontrol package (#3302)
4630191fa [wpiutil] circular_buffer: Use value initialization instead of passing zero (#3303)
b7b178f49 [wpilib] Remove Potentiometer interface
687066af3 [wpilib] Remove GyroBase
6b168ab0c [wpilib] Remove PIDController, PIDOutput, PIDSource
948625de9 [wpimath] Document conversion from filter cutoff frequency to time constant (#3299)
3848eb8b1 [wpilibc] Fix flywhel -> flywheel typo in FlywheelSim (#3298)
3abe0b9d4 [cscore] Move java package to edu.wpi.first.cscore (#3294)
d7fabe81f [wpilib] Remove RobotDrive (#3295)
1dc81669c [wpilib] Remove GearTooth (#3293)
01d0e1260 [wpilib] Revert move of RomiGyro into main wpilibc/j (#3296)
397e569aa [ntcore] Remove "using wpi" from nt namespace
79267f9e6 [ntcore] Remove NetworkTable -> nt::NetworkTable shim
48ebe5736 [ntcore] Remove deprecated Java interfaces and classes
c2064c78b [ntcore] Remove deprecated ITable interfaces
36608a283 [ntcore] Remove deprecated C++ APIs
a1c87e1e1 [glass] LogView: Add "copy to clipboard" button (#3274)
fa7240a50 [wpimath] Fix typo in quintic spline basis matrix
ffb4d38e2 [wpimath] Add derivation for spline basis matrices
f57c188f2 [wpilib] Add AnalogEncoder(int) ctor (#3273)
8471c4fb2 [wpilib] FieldObject2d: Add setTrajectory() method (#3277)
c97acd18e [glass] Field2d enhancements (#3234)
ffb590bfc [wpilib] Fix Compressor sendable properties (#3269)
6137f98eb [hal] Rename SimValueCallback2 to SimValueCallback (#3212)
a6f653969 [hal] Move registerSimPeriodic functions to HAL package (#3211)
10c038d9b [glass] Plot: Fix window creation after removal (#3264)
2d2eaa3ef [wpigui] Ensure window will be initially visible (#3256)
4d28b1f0c [wpimath] Use JNI for trajectory serialization (#3257)
3de800a60 [wpimath] TrajectoryUtil.h: Comment formatting (NFC) (#3262)
eff592377 [glass] Plot: Don't overwrite series ID (#3260)
a79faace1 [wpilibc] Return reference from GetInstance (#3247)
9550777b9 [wpilib] PWMSpeedController: Use PWM by composition (#3248)
c8521a3c3 [glass] Plot: Set reasonable default window size (#3261)
d71eb2cf3 [glass] Plot: Show full source name as tooltip and in popup (#3255)
160fb740f [hal] Use std::lround() instead of adding 0.5 and truncating (#3012)
48e9f3951 [wpilibj] Remove wpilibj package CameraServer (#3213)
8afa596fd [wpilib] Remove deprecated Sendable functions and SendableBase (#3210)
d3e45c297 [wpimath] Make C++ geometry classes immutable (#3249)
2c98939c1 [glass] StringChooser: Don't call SameLine() at end
a18a7409f [glass] NTStringChooser: Clear value of deleted entries
2f19cf452 [glass] NetworkTablesHelper: listen to delete events
da96707dc Merge branch 'main' into 2022
c3a8bdc24 [build] Fix clang-tidy action (#3246)
21624ef27 Add ImGui OutlineViewer (#3220)
1032c9b91 [wpiutil] Unbreak wpi::Format on Windows (#3242)
2e07902d7 [glass] NTField2D: Fix name lookup (#3233)
6e23e1840 [wpilibc] Remove WPILib.h (#3235)
3e22e4506 [wpilib] Make KoP drivetrain simulation weight 60 lbs (#3228)
79d1bd6c8 [glass] NetworkTablesSetting: Allow disable of server option (#3227)
fe341a16f [examples] Use more logical elevator setpoints in GearsBot (#3198)
62abf46b3 [glass] NetworkTablesSettings: Don't block GUI (#3226)
a95a5e0d9 [glass] Move NetworkTablesSettings to libglassnt (#3224)
d6f6ceaba [build] Run Spotless formatter (NFC) (#3221)
0922f8af5 [commands] CommandScheduler.requiring(): Note return can be null (NFC) (#2934)
6812302ff [examples] Make DriveDistanceOffboard example work in sim (#3199)
f3f86b8e7 [wpimath] Add pose estimator overload for vision + std dev measurement (#3200)
1a2680b9e [wpilibj] Change CommandBase.withName() to return CommandBase (#3209)
435bbb6a8 [command] RamseteCommand: Output 0 if interrupted (#3216)
3cf44e0a5 [hal] Add function for changing HAL Notifier thread priority (#3218)
40b367513 [wpimath] Units.java: Add kg-lb conversions (#3203)
9f563d584 [glass] NT: Fix return value in StringToDoubleArray (#3208)
af4adf537 [glass] Auto-size plots to fit window (#3193)
2560146da [sim] GUI: Add option to show prefix in Other Devices (#3186)
eae3a6397 gitignore: Ignore .cache directory (#3196)
959611420 [wpilib] Require non-zero positive value for PIDController.period (#3175)
9522f2e8c [wpimath] Add methods to concatenate trajectories (#3139)
e42a0b6cf [wpimath] Rotation2d comment formatting (NFC) (#3162)
d1c7032de [wpimath] Fix order of setting gyro offset in pose estimators (#3176)
d241bc81a [sim] Add DoubleSolenoidSim and SolenoidSim classes (#3177)
cb7f39afa [wpilibc] Add RobotController::GetBatteryVoltage() to C++ (#3179)
99b5ad9eb [wpilibj] Fix warnings that are not unused variables or deprecation (#3161)
c14b23775 [build] Fixup doxygen generated include dirs to match what users would need (#3154)
d447c7dc3 [sim] Add SimDeviceSim ctor overloads (#3134)
247420c9c [build] Remove jcenter repo (#3157)
04b112e00 [build] Include debug info in plugin published artifacts (#3149)
be0ce9900 [examples] Use PWMSparkMax instead of PWMVictorSPX (#3156)
69e8d0b65 [wpilib] Move RomiGyro into main wpilibc/j (#3143)
94e685e1b [wpimath] Add custom residual support to EKF (#3148)
5899f3dd2 [sim] GUI: Make keyboard settings loading more robust (#3167)
f82aa1d56 [wpilib] Fix HolonomicDriveController atReference() behavior (#3163)
fe5c2cf4b [wpimath] Remove ControllerUtil.java (#3169)
43d40c6e9 [wpiutil] Suppress unchecked cast in CombinedRuntimeLoader (#3155)
3d44d8f79 [wpimath] Fix argument order in UKF docs (NFC) (#3147)
ba6fe8ff2 [cscore] Add USB camera change event (#3123)
533725888 [build] Tweak OpenCV cmake search paths to work better on Linux (#3144)
29bf9d6ef [cscore] Add polled support to listener
483beb636 [ntcore] Move CallbackManager to wpiutil
fdaec7759 [examples] Instantiate m_ramseteController in example (#3142)
8494a5761 Rename default branch to main (#3140)
45590eea2 [wpigui] Hardcode window scale to 1 on macOS (#3135)
834a64920 [build] Publish libglass and libglassnt to Maven (#3127)
2c2ccb361 [wpimath] Fix Rotation2d equality operator (#3128)
fb5c8c39a [wpigui] clang-tidy: readability-braces-around-statements
f7d39193a [wpigui] Fix copyright in pfd and wpigui_metal.mm
aec796b21 [ntcore] Fix conditional jump on uninitialized value (#3125)
fb13bb239 [sim] GUI: Add right click popup for keyboard joystick settings (#3119)
c517ec677 [build] Update thirdparty-imgui to 1.79-2 (#3118)
e8cbf2a71 [wpimath] Fix typo in SwerveDrivePoseEstimator doc (NFC) (#3112)
e9c86df46 [wpimath] Add tests for swerve module optimization (#3100)
6ba8c289c [examples] Remove negative of ArcadeDrive(fwd, ..) in the C++ Getting Started Example (#3102)
3f1672e89 [hal] Add SimDevice createInt() and createLong() (#3110)
15be5cbf1 [examples] Fix segfault in GearsBot C++ example (#3111)
4cf0e5e6d Add quick links to API documentation in README (#3082)
6b1898f12 Fix RT priority docs (NFC) (#3098)
b3426e9c0 [wpimath] Fix missing whitespace in pose estimator doc (#3097)
38c1a1f3e [examples] Fix feildRelative -> fieldRelative typo in XControllerCommand examples (#3104)
4488e25f1 [glass] Shorten SmartDashboard window names (#3096)
cfdb3058e [wpilibj] Update SimDeviceSimTest (#3095)
64adff5fe [examples] Fix typo in ArcadeDrive constructor parameter name (#3092)
6efc58e3d [build] Fix issues with build on windows, deprecations, and native utils (#3090)
f393989a5 [wpimath, wpiutil] Add wpi::array for compile time size checking (#3087)
d6ed20c1e [build] Set macOS deployment target to 10.14 (#3088)
7c524014c [hal] Add [[nodiscard]] to HAL_WaitForNotifierAlarm() (#3085)
406d055f0 [wpilib] Fixup wouldHitLowerLimit in elevator and arm simulation classes. (#3076)
04a90b5dd [examples] Don't continually set setpoint in PotentiometerPID Examples (#3084)
8c5bfa013 [sim] GUI: Add max value setting for keyboard joysticks (#3083)
bc80c5535 [hal] Add SimValue reset() function (#3064)
9c3b51ca0 [wpilib] Document simulation APIs (#3079)
26584ff14 [wpimath] Add model description to LinearSystemId Javadocs (#3080)
42c3d5286 [examples] Sync Java and C++ trajectories in sim example (#3081)
64e72f710 [wpilibc] Add missing function RoboRioSim::ResetData (#3073)
e95503798 [wpimath] Add optimize() to SwerveModuleState (#3065)
fb99910c2 [hal] Add SimInt and SimLong wrappers for int/long SimValue (#3066)
e620bd4d3 [doc] Add machine-readable websocket specification (#3059)
a44e761d9 [glass] Add support for plot Y axis labels
ea1974d57 [wpigui] Update imgui and implot to latest
85a0bd43c [wpimath] Add RKF45 integration (#3047)
278e0f126 [glass] Use .controllable to set widgets' read-only state (#3035)
d8652cfd4 [wpimath] Make Java DCMotor API consistent with C++ and fix motor calcs (#3046)
377b7065a [build] Add toggleOffOn to Java spotless (#3053)
1e9c79c58 [sim] Use plant output to retrieve simulated position (#3043)
78147aa34 [sim] GUI: Fix Keyboard Joystick (#3052)
cd4a2265b [ntcore] Fix NetworkTableEntry::GetRaw() (#3051)
767ac1de1 [build] Use deploy key for doc publish (#3048)
d762215d1 [build] Add publish documentation script (#3040)
1fd09593c [examples] Add missing TestInit method to GettingStarted Example (#3039)
e45a0f6ce [examples] Add RomiGyro to the Romi Reference example (#3037)
94f852572 Update imaging link and fix typo (#3038)
d73cf64e5 [examples] Update RomiReference to match motor directions (#3036)
f945462ba Bump copyright year to 2021 (#3033)
b05946175 [wpimath] Catch Drake JNI exceptions and rethrow them (#3032)
62f0f8190 [wpimath] Deduplicate angle modulus functions (#2998)
bf8c0da4b [glass] Add "About" popup with version number (#3031)
dfdd6b389 [build] Increase Gradle heap size in Gazebo build (#3028)
f5e0fc3e9 Finish clang-tidy cleanups (#3003)
d741101fe [sim] Revert accidental commit of WSProvider_PDP.h (#3027)
e1620799c [examples] Add C++ RomiReference example (#2969)
749c7adb1 [command] Fix use-after-free in CommandScheduler (#3024)
921a73391 [sim] Add WS providers for AddressableLED, PCM, and Solenoid (#3026)
26d0004fe [build] Split Actions into different yml files (#3025)
948af6d5b [wpilib] PWMSpeedController.get(): Apply Inversion (#3016)
670a187a3 [wpilibc] SuppliedValueWidget.h: Forward declare ShuffleboardContainer (#3021)
be9f72502 [ntcore] NetworkTableValue: Use std::forward instead of std::move (#3022)
daf3f4cb1 [cscore] cscore_raw_cv.h: Fix error in PutFrame() (#3019)
5acda4cc7 [wpimath] ElevatorFeedforward.h: Add time.h include
8452af606 [wpimath] units/radiation.h: Add mass.h include
630d44952 [hal] ErrorsInternal.h: Add stdint.h include
7372cf7d9 [cscore] Windows NetworkUtil.cpp: Add missing include
b7e46c558 Include .h from .inc/.inl files (NFC) (#3017)
bf8f8710e [examples] Update Romi template and example (#2996)
6ffe5b775 [glass] Ensure NetworkTableTree parent context menu has an id (#3015)
be0805b85 [build] Update to WPILibVersioningPlugin 4.1.0 (#3014)
65b2359b2 [build] Add spotless for other files (#3007)
8651aa73e [examples] Enable NT Flush in Field2d examples (#3013)
78b542737 [build] Add Gazebo build to Actions CI (#3004)
fccf86532 [sim] DriverStationGui: Fix two bugs (#3010)
185741760 [sim] WSProvider_Joystick: Fix off-by-1 in incoming buttons (#3011)
ee7114a58 [glass] Add drive class widgets (#2975)
00fa91d0d [glass] Use ImGui style for gyro widget colors (#3009)
b7a25bfc3 ThirdPartyNotices: Add portable file dialogs license (#3005)
a2e46b9a1 [glass] modernize-use-nullptr (NFC) (#3006)
a751fa22d [build] Apply spotless for java formatting (#1768)
e563a0b7d [wpimath] Make LinearSystemLoop move-constructible and move-assignable (#2967)
49085ca94 [glass] Add context menus to remove and add NetworkTables values (#2979)
560a850a2 [glass] Add NetworkTables Log window (#2997)
66782e231 [sim] Create Left/Right drivetrain current accessors (#3001)
b60eb1544 clang-tidy: bugprone-virtual-near-miss
cbe59fa3b clang-tidy: google-explicit-constructor
c97c6dc06 clang-tidy: google-readability-casting (NFC)
32fa97d68 clang-tidy: modernize-use-nullptr (NFC)
aee460326 clang-tidy: modernize-pass-by-value
29c7da5f1 clang-tidy: modernize-make-unique
6131f4e32 clang-tidy: modernize-concat-nested-namespaces (NFC)
67e03e625 clang-tidy: modernize-use-equals-default
b124f9101 clang-tidy: modernize-use-default-member-init
d11a3a638 clang-tidy: modernize-use-override (NFC)
4cc0706b0 clang-tidy: modernize-use-using (NFC)
885f5a978 [wpilibc] Speed up ScopedTracerTest (#2999)
60b596457 [wpilibj] Fix typos (NFC) (#3000)
6e1919414 [build] Bring naming checkstyle rules up to date with Google Style guide (#1781)
8c8ec5e63 [wpilibj] Suppress unchecked cast warnings (#2995)
b8413ddd5 [wpiutil] Add noexcept to timestamp static functions (#2994)
5d976b6e1 [glass] Load NetworkTableView settings on first draw (#2993)
2b4317452 Replace NOLINT(runtime/explicit) comments with NOLINT (NFC) (#2992)
1c3011ba4 [glass] Fix handling of "/" NetworkTables key (#2991)
574a42f3b [hal] Fix UnsafeManipulateDIO status check (#2987)
9005cd59e [wpilib] Clamp input voltage in sim classes (#2955)
dd494d4ab [glass] NetworkTablesModel::Update(): Avoid use-after-move (#2988)
7cca469a1 [wpimath] NormalizeAngle: Make inline, remove unnamed namespace (#2986)
2aed432b4 Add braces to C++ single-line loops and conditionals (NFC) (#2973)
0291a3ff5 [wpiutil] StringRef: Add noexcept to several constructors (#2984)
5d7315280 [wpimath] Update UnitsTest.cpp copyright (#2985)
254931b9a [wpimath] Remove LinearSystem from LinearSystemLoop (#2968)
aa89744c9 Update OtherVersions.md to include wpimath info (#2983)
1cda3f5ad [glass] Fix styleguide (#2976)
8f1f64ffb Remove year from file copyright message (NFC) (#2972)
2bc0a7795 [examples] Fix wpiformat warning about utility include (#2971)
4204da6ad [glass] Add application icon
7ac39b10f [wpigui] Add icon support
6b567e006 [wpimath] Add support for varying vision standard deviations in pose estimators (#2956)
df299d6ed [wpimath] Add UnscentedKalmanFilter::Correct() overload (#2966)
4e34f0523 [examples] Use ADXRS450_GyroSim class in simulation example (#2964)
9962f6fd7 [wpilib] Give Field2d a default Sendable name (#2953)
f9d492f4b [sim] GUI: Show "Other Devices" window by default (#2961)
a8bb2ef1c [sim] Fix ADXRS450_GyroSim and DutyCycleEncoderSim (#2963)
240c629cd [sim] Try to guess "Map Gamepad" setting (#2960)
952567dd3 [wpilibc] Add missing move constructors and assignment operators (#2959)
10b396b4c [sim] Various WebSockets fixes and enhancements (#2952)
699bbe21a [examples] Fix comments in Gearsbot to match implementation (NFC) (#2957)
27b67deca [glass] Add more widgets (#2947)
581b7ec55 [wpilib] Add option to flush NetworkTables every iterative loop
acfbb1a44 [ntcore] DispatcherBase::Flush: Use wpi::Now()
d85a6d8fe [ntcore] Reduce limit on flush and update rate to 5 ms
20fbb5c63 [sim] Fix stringop truncation warning from GCC 10 (#2945)
1051a06a7 [glass] Show NT timestamps in seconds (#2944)
98dfc2620 [glass] Fix plots (#2943)
1ba0a2ced [sim] GUI: Add keyboard virtual joystick support (#2940)
4afb13f98 [examples] Replace M_PI with wpi::math::pi (#2938)
b27d33675 [examples] Enhance Romi templates (#2931)
00b9ae77f [sim] Change default WS port number to 3300 (#2932)
65219f309 [examples] Update Field2d position in periodic() (#2928)
f78d1d434 [sim] Process WS Encoder reset internally (#2927)
941edca59 [hal] Add Java SimDeviceDataJNI.getSimDeviceName (#2924)
a699435ed [wpilibj] Fix FlywheelSim argument order in constructor (#2922)
66d641718 [examples] Add tasks to run Java examples (#2920)
558e37c41 [examples] Add simple differential drive simulation example (#2918)
4f40d991e [glass] Switch name of Glass back to glass (#2919)
549af9900 [build] Update native-utils to 2021.0.6 (#2914)
b33693009 [glass] Change basename of glass to Glass (#2915)
c9a0edfb8 [glass] Package macOS application bundle
2c5668af4 [wpigui] Add platform-specific preferences save
751dea32a [wpilibc] Try to work around ABI break introduced in #2901 (#2917)
cd8f4bfb1 [build] Package up msvc runtime into maven artifact (#2913)
a6cfcc686 [wpilibc] Move SendableChooser Doxygen comments to header (NFC) (#2911)
b8c4f603d [wpimath] Upgrade to Eigen 3.3.9 (#2910)
0075e4b39 [wpilibj] Fix NPE in Field2d (#2909)
125af556c [simulation] Fix halsim_gui ntcore and wpiutil deps (#2908)
963ad5c25 [wpilib] Add noise to Differential Drive simulator (#2903)
387f56cb7 [examples] Add Romi reference Java example and templates (#2905)
b3deda38c [examples] Zero motors on disabledInit() in sim physics examples (#2906)
2a5ca7745 [glass] Add glass: an application for display of robot data
727940d84 [wpilib] Move Field2d to SmartDashboard
8cd42478e [wpilib] SendableBuilder: Make GetTable() visible
c11d34b26 [command] Use addCommands in command group templates (#2900)
339d7445b [sim] Add HAL hooks for simulationPeriodic (#2881)
d16f05f2c [wpilib] Fix SmartDashboard update order (#2896)
5427b32a4 [wpiutil] unique_function: Restrict implicit conversion (#2899)
f73701239 [ntcore] Add missing SetDefault initializer_list functions (#2898)
f5a6fc070 [sim] Add initialized flag for all solenoids on a PCM (#2897)
bdf5ba91a [wpilibj] Fix typo in ElevatorSim (#2895)
bc8f33877 [wpilib] Add pose estimators (#2867)
3413bfc06 [wpilib] PIDController: Recompute the error in AtSetpoint() (#2822)
2056f0ce0 [wpilib] Fix bugs in Hatchbot examples (#2893)
5eb8cfd69 [wpilibc] Fix MatchDataSender (#2892)
e6a425448 [build] Delete test folders after tests execute (#2891)
d478ad00d [imgui] Allow usage of imgui_stdlib (#2889)
53eda861d [build] Add unit-testing infrastructure to examples (#2863)
cc1d86ba6 [sim] Add title to simulator GUI window (#2888)
f0528f00e [build] CMake: Use project-specific binary and source dirs (#2886)
5cd2ad124 [wpilibc] Add Color::operator!= (#2887)
6c00e7a90 [build] CI CMake: build with GUI enabled (#2884)
53170bbb5 Update roboRIO toolchain installation instructions (#2883)
467258e05 [sim] GUI: Add option to not zero disconnected joysticks (#2876)
129be23c9 Clarify JDK installation instructions in readme (#2882)
8e9290e86 [build] Add separate CMake setting for wpimath (#2885)
7cf5bebf8 [wpilibj] Cache NT writes from DriverStation (#2780)
f7f9087fb [command] Fix timing issue in RamseteCommand (#2871)
256e7904f [wpilibj] SimDeviceSim: Fix sim value changed callback (#2880)
c8ea1b6c3 [wpilib] Add function to adjust LQR controller gain for pure time delay (#2878)
2816b06c0 [sim] HAL_GetControlWord: Fully zero output (#2873)
4c695ea08 Add toolchain installation instructions to README (#2875)
a14d51806 [wpimath] DCMotor: fix doc typo (NFC) (#2868)
017097791 [build] CMake: build sim extensions as shared libs (#2866)
f61726b5a [build] Fix cmake-config files (#2865)
fc27fdac5 [wpilibc] Cache NT values from driver station (#2768)
47c59859e [sim] Make SimDevice callbacks synchronous (#2861)
6e76ab9c0 [build] Turn on WITH_GUI for Windows cmake CI
5f78b7670 [build] Set GLFW_INSTALL to OFF
5e0808c84 [wpigui] Fix Windows cmake build
508f05a47 [imgui] Fix typo in Windows CMake target sources

Change-Id: I1737b45965f31803a96676bedc7dc40e337aa321
git-subtree-dir: third_party/allwpilib
git-subtree-split: e473a00f9785f9949e5ced30901baeaf426d2fc9
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/wpilibc/src/main/native/cpp/ADXL345_I2C.cpp b/wpilibc/src/main/native/cpp/ADXL345_I2C.cpp
index aff0802..484e690 100644
--- a/wpilibc/src/main/native/cpp/ADXL345_I2C.cpp
+++ b/wpilibc/src/main/native/cpp/ADXL345_I2C.cpp
@@ -1,28 +1,25 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/ADXL345_I2C.h"
 
 #include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <networktables/NTSendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 using namespace frc;
 
 ADXL345_I2C::ADXL345_I2C(I2C::Port port, Range range, int deviceAddress)
     : m_i2c(port, deviceAddress),
-      m_simDevice("ADXL345_I2C", port, deviceAddress) {
+      m_simDevice("Accel:ADXL345_I2C", port, deviceAddress) {
   if (m_simDevice) {
-    m_simRange =
-        m_simDevice.CreateEnum("Range", true, {"2G", "4G", "8G", "16G"}, 0);
-    m_simX = m_simDevice.CreateDouble("X Accel", false, 0.0);
-    m_simY = m_simDevice.CreateDouble("Y Accel", false, 0.0);
-    m_simZ = m_simDevice.CreateDouble("Z Accel", false, 0.0);
+    m_simRange = m_simDevice.CreateEnumDouble("range", hal::SimDevice::kOutput,
+                                              {"2G", "4G", "8G", "16G"},
+                                              {2.0, 4.0, 8.0, 16.0}, 0);
+    m_simX = m_simDevice.CreateDouble("x", hal::SimDevice::kInput, 0.0);
+    m_simY = m_simDevice.CreateDouble("y", hal::SimDevice::kInput, 0.0);
+    m_simZ = m_simDevice.CreateDouble("z", hal::SimDevice::kInput, 0.0);
   }
   // Turn on the measurements
   m_i2c.Write(kPowerCtlRegister, kPowerCtl_Measure);
@@ -32,7 +29,15 @@
   HAL_Report(HALUsageReporting::kResourceType_ADXL345,
              HALUsageReporting::kADXL345_I2C, 0);
 
-  SendableRegistry::GetInstance().AddLW(this, "ADXL345_I2C", port);
+  wpi::SendableRegistry::AddLW(this, "ADXL345_I2C", port);
+}
+
+I2C::Port ADXL345_I2C::GetI2CPort() const {
+  return m_i2c.GetPort();
+}
+
+int ADXL345_I2C::GetI2CDeviceAddress() const {
+  return m_i2c.GetDeviceAddress();
 }
 
 void ADXL345_I2C::SetRange(Range range) {
@@ -40,16 +45,28 @@
               kDataFormat_FullRes | static_cast<uint8_t>(range));
 }
 
-double ADXL345_I2C::GetX() { return GetAcceleration(kAxis_X); }
+double ADXL345_I2C::GetX() {
+  return GetAcceleration(kAxis_X);
+}
 
-double ADXL345_I2C::GetY() { return GetAcceleration(kAxis_Y); }
+double ADXL345_I2C::GetY() {
+  return GetAcceleration(kAxis_Y);
+}
 
-double ADXL345_I2C::GetZ() { return GetAcceleration(kAxis_Z); }
+double ADXL345_I2C::GetZ() {
+  return GetAcceleration(kAxis_Z);
+}
 
 double ADXL345_I2C::GetAcceleration(ADXL345_I2C::Axes axis) {
-  if (axis == kAxis_X && m_simX) return m_simX.Get();
-  if (axis == kAxis_Y && m_simY) return m_simY.Get();
-  if (axis == kAxis_Z && m_simZ) return m_simZ.Get();
+  if (axis == kAxis_X && m_simX) {
+    return m_simX.Get();
+  }
+  if (axis == kAxis_Y && m_simY) {
+    return m_simY.Get();
+  }
+  if (axis == kAxis_Z && m_simZ) {
+    return m_simZ.Get();
+  }
   int16_t rawAccel = 0;
   m_i2c.Read(kDataRegister + static_cast<int>(axis), sizeof(rawAccel),
              reinterpret_cast<uint8_t*>(&rawAccel));
@@ -74,12 +91,12 @@
   return data;
 }
 
-void ADXL345_I2C::InitSendable(SendableBuilder& builder) {
+void ADXL345_I2C::InitSendable(nt::NTSendableBuilder& builder) {
   builder.SetSmartDashboardType("3AxisAccelerometer");
   auto x = builder.GetEntry("X").GetHandle();
   auto y = builder.GetEntry("Y").GetHandle();
   auto z = builder.GetEntry("Z").GetHandle();
-  builder.SetUpdateTable([=]() {
+  builder.SetUpdateTable([=] {
     auto data = GetAccelerations();
     nt::NetworkTableEntry(x).SetDouble(data.XAxis);
     nt::NetworkTableEntry(y).SetDouble(data.YAxis);
diff --git a/wpilibc/src/main/native/cpp/ADXL345_SPI.cpp b/wpilibc/src/main/native/cpp/ADXL345_SPI.cpp
index 329b148..9a95bcc 100644
--- a/wpilibc/src/main/native/cpp/ADXL345_SPI.cpp
+++ b/wpilibc/src/main/native/cpp/ADXL345_SPI.cpp
@@ -1,27 +1,24 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/ADXL345_SPI.h"
 
 #include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <networktables/NTSendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 using namespace frc;
 
 ADXL345_SPI::ADXL345_SPI(SPI::Port port, ADXL345_SPI::Range range)
-    : m_spi(port), m_simDevice("ADXL345_SPI", port) {
+    : m_spi(port), m_simDevice("Accel:ADXL345_SPI", port) {
   if (m_simDevice) {
-    m_simRange =
-        m_simDevice.CreateEnum("Range", true, {"2G", "4G", "8G", "16G"}, 0);
-    m_simX = m_simDevice.CreateDouble("X Accel", false, 0.0);
-    m_simY = m_simDevice.CreateDouble("Y Accel", false, 0.0);
-    m_simZ = m_simDevice.CreateDouble("Z Accel", false, 0.0);
+    m_simRange = m_simDevice.CreateEnumDouble("range", hal::SimDevice::kOutput,
+                                              {"2G", "4G", "8G", "16G"},
+                                              {2.0, 4.0, 8.0, 16.0}, 0);
+    m_simX = m_simDevice.CreateDouble("x", hal::SimDevice::kInput, 0.0);
+    m_simY = m_simDevice.CreateDouble("y", hal::SimDevice::kInput, 0.0);
+    m_simZ = m_simDevice.CreateDouble("z", hal::SimDevice::kInput, 0.0);
   }
   m_spi.SetClockRate(500000);
   m_spi.SetMSBFirst();
@@ -40,7 +37,11 @@
   HAL_Report(HALUsageReporting::kResourceType_ADXL345,
              HALUsageReporting::kADXL345_SPI);
 
-  SendableRegistry::GetInstance().AddLW(this, "ADXL345_SPI", port);
+  wpi::SendableRegistry::AddLW(this, "ADXL345_SPI", port);
+}
+
+SPI::Port ADXL345_SPI::GetSpiPort() const {
+  return m_spi.GetPort();
 }
 
 void ADXL345_SPI::SetRange(Range range) {
@@ -51,19 +52,33 @@
   commands[1] = kDataFormat_FullRes | static_cast<uint8_t>(range & 0x03);
   m_spi.Transaction(commands, commands, 2);
 
-  if (m_simRange) m_simRange.Set(range);
+  if (m_simRange) {
+    m_simRange.Set(range);
+  }
 }
 
-double ADXL345_SPI::GetX() { return GetAcceleration(kAxis_X); }
+double ADXL345_SPI::GetX() {
+  return GetAcceleration(kAxis_X);
+}
 
-double ADXL345_SPI::GetY() { return GetAcceleration(kAxis_Y); }
+double ADXL345_SPI::GetY() {
+  return GetAcceleration(kAxis_Y);
+}
 
-double ADXL345_SPI::GetZ() { return GetAcceleration(kAxis_Z); }
+double ADXL345_SPI::GetZ() {
+  return GetAcceleration(kAxis_Z);
+}
 
 double ADXL345_SPI::GetAcceleration(ADXL345_SPI::Axes axis) {
-  if (axis == kAxis_X && m_simX) return m_simX.Get();
-  if (axis == kAxis_Y && m_simY) return m_simY.Get();
-  if (axis == kAxis_Z && m_simZ) return m_simZ.Get();
+  if (axis == kAxis_X && m_simX) {
+    return m_simX.Get();
+  }
+  if (axis == kAxis_Y && m_simY) {
+    return m_simY.Get();
+  }
+  if (axis == kAxis_Z && m_simZ) {
+    return m_simZ.Get();
+  }
   uint8_t buffer[3];
   uint8_t command[3] = {0, 0, 0};
   command[0] = (kAddress_Read | kAddress_MultiByte | kDataRegister) +
@@ -103,12 +118,12 @@
   return data;
 }
 
-void ADXL345_SPI::InitSendable(SendableBuilder& builder) {
+void ADXL345_SPI::InitSendable(nt::NTSendableBuilder& builder) {
   builder.SetSmartDashboardType("3AxisAccelerometer");
   auto x = builder.GetEntry("X").GetHandle();
   auto y = builder.GetEntry("Y").GetHandle();
   auto z = builder.GetEntry("Z").GetHandle();
-  builder.SetUpdateTable([=]() {
+  builder.SetUpdateTable([=] {
     auto data = GetAccelerations();
     nt::NetworkTableEntry(x).SetDouble(data.XAxis);
     nt::NetworkTableEntry(y).SetDouble(data.YAxis);
diff --git a/wpilibc/src/main/native/cpp/ADXL362.cpp b/wpilibc/src/main/native/cpp/ADXL362.cpp
index aff572f..deda965 100644
--- a/wpilibc/src/main/native/cpp/ADXL362.cpp
+++ b/wpilibc/src/main/native/cpp/ADXL362.cpp
@@ -1,17 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/ADXL362.h"
 
 #include <hal/FRCUsageReporting.h>
+#include <networktables/NTSendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/DriverStation.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -35,13 +32,14 @@
 ADXL362::ADXL362(Range range) : ADXL362(SPI::Port::kOnboardCS1, range) {}
 
 ADXL362::ADXL362(SPI::Port port, Range range)
-    : m_spi(port), m_simDevice("ADXL362", port) {
+    : m_spi(port), m_simDevice("Accel:ADXL362", port) {
   if (m_simDevice) {
-    m_simRange =
-        m_simDevice.CreateEnum("Range", true, {"2G", "4G", "8G", "16G"}, 0);
-    m_simX = m_simDevice.CreateDouble("X Accel", false, 0.0);
-    m_simY = m_simDevice.CreateDouble("Y Accel", false, 0.0);
-    m_simZ = m_simDevice.CreateDouble("Z Accel", false, 0.0);
+    m_simRange = m_simDevice.CreateEnumDouble("range", hal::SimDevice::kOutput,
+                                              {"2G", "4G", "8G", "16G"},
+                                              {2.0, 4.0, 8.0, 16.0}, 0);
+    m_simX = m_simDevice.CreateDouble("x", hal::SimDevice::kInput, 0.0);
+    m_simY = m_simDevice.CreateDouble("y", hal::SimDevice::kInput, 0.0);
+    m_simZ = m_simDevice.CreateDouble("z", hal::SimDevice::kInput, 0.0);
   }
 
   m_spi.SetClockRate(3000000);
@@ -58,7 +56,7 @@
     commands[2] = 0;
     m_spi.Transaction(commands, commands, 3);
     if (commands[2] != 0xF2) {
-      DriverStation::ReportError("could not find ADXL362");
+      FRC_ReportError(err::Error, "{}", "could not find ADXL362");
       m_gsPerLSB = 0.0;
       return;
     }
@@ -74,11 +72,17 @@
 
   HAL_Report(HALUsageReporting::kResourceType_ADXL362, port + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "ADXL362", port);
+  wpi::SendableRegistry::AddLW(this, "ADXL362", port);
+}
+
+SPI::Port ADXL362::GetSpiPort() const {
+  return m_spi.GetPort();
 }
 
 void ADXL362::SetRange(Range range) {
-  if (m_gsPerLSB == 0.0) return;
+  if (m_gsPerLSB == 0.0) {
+    return;
+  }
 
   uint8_t commands[3];
 
@@ -102,21 +106,37 @@
       kFilterCtl_ODR_100Hz | static_cast<uint8_t>((range & 0x03) << 6);
   m_spi.Write(commands, 3);
 
-  if (m_simRange) m_simRange.Set(range);
+  if (m_simRange) {
+    m_simRange.Set(range);
+  }
 }
 
-double ADXL362::GetX() { return GetAcceleration(kAxis_X); }
+double ADXL362::GetX() {
+  return GetAcceleration(kAxis_X);
+}
 
-double ADXL362::GetY() { return GetAcceleration(kAxis_Y); }
+double ADXL362::GetY() {
+  return GetAcceleration(kAxis_Y);
+}
 
-double ADXL362::GetZ() { return GetAcceleration(kAxis_Z); }
+double ADXL362::GetZ() {
+  return GetAcceleration(kAxis_Z);
+}
 
 double ADXL362::GetAcceleration(ADXL362::Axes axis) {
-  if (m_gsPerLSB == 0.0) return 0.0;
+  if (m_gsPerLSB == 0.0) {
+    return 0.0;
+  }
 
-  if (axis == kAxis_X && m_simX) return m_simX.Get();
-  if (axis == kAxis_Y && m_simY) return m_simY.Get();
-  if (axis == kAxis_Z && m_simZ) return m_simZ.Get();
+  if (axis == kAxis_X && m_simX) {
+    return m_simX.Get();
+  }
+  if (axis == kAxis_Y && m_simY) {
+    return m_simY.Get();
+  }
+  if (axis == kAxis_Z && m_simZ) {
+    return m_simZ.Get();
+  }
 
   uint8_t buffer[4];
   uint8_t command[4] = {0, 0, 0, 0};
@@ -162,12 +182,12 @@
   return data;
 }
 
-void ADXL362::InitSendable(SendableBuilder& builder) {
+void ADXL362::InitSendable(nt::NTSendableBuilder& builder) {
   builder.SetSmartDashboardType("3AxisAccelerometer");
   auto x = builder.GetEntry("X").GetHandle();
   auto y = builder.GetEntry("Y").GetHandle();
   auto z = builder.GetEntry("Z").GetHandle();
-  builder.SetUpdateTable([=]() {
+  builder.SetUpdateTable([=] {
     auto data = GetAccelerations();
     nt::NetworkTableEntry(x).SetDouble(data.XAxis);
     nt::NetworkTableEntry(y).SetDouble(data.YAxis);
diff --git a/wpilibc/src/main/native/cpp/ADXRS450_Gyro.cpp b/wpilibc/src/main/native/cpp/ADXRS450_Gyro.cpp
index 8ea5b41..5a2f625 100644
--- a/wpilibc/src/main/native/cpp/ADXRS450_Gyro.cpp
+++ b/wpilibc/src/main/native/cpp/ADXRS450_Gyro.cpp
@@ -1,22 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/ADXRS450_Gyro.h"
 
 #include <hal/FRCUsageReporting.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/DriverStation.h"
+#include "frc/Errors.h"
 #include "frc/Timer.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
-static constexpr auto kSamplePeriod = 0.0005_s;
-static constexpr double kCalibrationSampleTime = 5.0;
+static constexpr auto kSamplePeriod = 0.5_ms;
+static constexpr auto kCalibrationSampleTime = 5_s;
 static constexpr double kDegreePerSecondPerLSB = 0.0125;
 
 // static constexpr int kRateRegister = 0x00;
@@ -32,10 +30,11 @@
 ADXRS450_Gyro::ADXRS450_Gyro() : ADXRS450_Gyro(SPI::kOnboardCS0) {}
 
 ADXRS450_Gyro::ADXRS450_Gyro(SPI::Port port)
-    : m_spi(port), m_port(port), m_simDevice("ADXRS450_Gyro", port) {
+    : m_spi(port), m_port(port), m_simDevice("Gyro:ADXRS450", port) {
   if (m_simDevice) {
-    m_simAngle = m_simDevice.CreateDouble("Angle", false, 0.0);
-    m_simRate = m_simDevice.CreateDouble("Rate", false, 0.0);
+    m_simAngle =
+        m_simDevice.CreateDouble("angle_x", hal::SimDevice::kInput, 0.0);
+    m_simRate = m_simDevice.CreateDouble("rate_x", hal::SimDevice::kInput, 0.0);
   }
 
   m_spi.SetClockRate(3000000);
@@ -47,7 +46,7 @@
   if (!m_simDevice) {
     // Validate the part ID
     if ((ReadRegister(kPIDRegister) & 0xff00) != 0x5200) {
-      DriverStation::ReportError("could not find ADXRS450 gyro");
+      FRC_ReportError(err::Error, "{}", "could not find ADXRS450 gyro");
       return;
     }
 
@@ -59,7 +58,7 @@
 
   HAL_Report(HALUsageReporting::kResourceType_ADXRS450, port + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "ADXRS450_Gyro", port);
+  wpi::SendableRegistry::AddLW(this, "ADXRS450_Gyro", port);
 }
 
 static bool CalcParity(int v) {
@@ -81,7 +80,9 @@
 
 uint16_t ADXRS450_Gyro::ReadRegister(int reg) {
   int cmd = 0x80000000 | static_cast<int>(reg) << 17;
-  if (!CalcParity(cmd)) cmd |= 1u;
+  if (!CalcParity(cmd)) {
+    cmd |= 1u;
+  }
 
   // big endian
   uint8_t buf[4] = {static_cast<uint8_t>((cmd >> 24) & 0xff),
@@ -91,29 +92,36 @@
 
   m_spi.Write(buf, 4);
   m_spi.Read(false, buf, 4);
-  if ((buf[0] & 0xe0) == 0) return 0;  // error, return 0
+  if ((buf[0] & 0xe0) == 0) {
+    return 0;  // error, return 0
+  }
   return static_cast<uint16_t>((BytesToIntBE(buf) >> 5) & 0xffff);
 }
 
 double ADXRS450_Gyro::GetAngle() const {
-  if (m_simAngle) return m_simAngle.Get();
+  if (m_simAngle) {
+    return m_simAngle.Get();
+  }
   return m_spi.GetAccumulatorIntegratedValue() * kDegreePerSecondPerLSB;
 }
 
 double ADXRS450_Gyro::GetRate() const {
-  if (m_simRate) return m_simRate.Get();
+  if (m_simRate) {
+    return m_simRate.Get();
+  }
   return static_cast<double>(m_spi.GetAccumulatorLastValue()) *
          kDegreePerSecondPerLSB;
 }
 
 void ADXRS450_Gyro::Reset() {
-  if (m_simAngle) m_simAngle.Set(0.0);
-  if (m_simRate) m_simRate.Set(0.0);
+  if (m_simAngle) {
+    m_simAngle.Reset();
+  }
   m_spi.ResetAccumulator();
 }
 
 void ADXRS450_Gyro::Calibrate() {
-  Wait(0.1);
+  Wait(100_ms);
 
   m_spi.SetAccumulatorIntegratedCenter(0);
   m_spi.ResetAccumulator();
@@ -124,4 +132,12 @@
   m_spi.ResetAccumulator();
 }
 
-int ADXRS450_Gyro::GetPort() const { return m_port; }
+int ADXRS450_Gyro::GetPort() const {
+  return m_port;
+}
+
+void ADXRS450_Gyro::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Gyro");
+  builder.AddDoubleProperty(
+      "Value", [=] { return GetAngle(); }, nullptr);
+}
diff --git a/wpilibc/src/main/native/cpp/AddressableLED.cpp b/wpilibc/src/main/native/cpp/AddressableLED.cpp
index 81adc7b..759c386 100644
--- a/wpilibc/src/main/native/cpp/AddressableLED.cpp
+++ b/wpilibc/src/main/native/cpp/AddressableLED.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AddressableLED.h"
 
@@ -12,22 +9,25 @@
 #include <hal/HALBase.h>
 #include <hal/PWM.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
 
-#include "frc/WPIErrors.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
-AddressableLED::AddressableLED(int port) {
+AddressableLED::AddressableLED(int port) : m_port{port} {
   int32_t status = 0;
 
-  m_pwmHandle = HAL_InitializePWMPort(HAL_GetPort(port), &status);
-  wpi_setHALErrorWithRange(status, 0, HAL_GetNumPWMChannels(), port);
+  auto stack = wpi::GetStackTrace(1);
+  m_pwmHandle =
+      HAL_InitializePWMPort(HAL_GetPort(port), stack.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Port {}", port);
   if (m_pwmHandle == HAL_kInvalidHandle) {
     return;
   }
 
   m_handle = HAL_InitializeAddressableLED(m_pwmHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", port);
   if (m_handle == HAL_kInvalidHandle) {
     HAL_FreePWMPort(m_pwmHandle, &status);
   }
@@ -39,29 +39,30 @@
   HAL_FreeAddressableLED(m_handle);
   int32_t status = 0;
   HAL_FreePWMPort(m_pwmHandle, &status);
+  FRC_ReportError(status, "Port {}", m_port);
 }
 
 void AddressableLED::SetLength(int length) {
   int32_t status = 0;
   HAL_SetAddressableLEDLength(m_handle, length, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {} length {}", m_port, length);
 }
 
 static_assert(sizeof(AddressableLED::LEDData) == sizeof(HAL_AddressableLEDData),
               "LED Structs MUST be the same size");
 
-void AddressableLED::SetData(wpi::ArrayRef<LEDData> ledData) {
+void AddressableLED::SetData(wpi::span<const LEDData> ledData) {
   int32_t status = 0;
   HAL_WriteAddressableLEDData(m_handle, ledData.begin(), ledData.size(),
                               &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::SetData(std::initializer_list<LEDData> ledData) {
   int32_t status = 0;
   HAL_WriteAddressableLEDData(m_handle, ledData.begin(), ledData.size(),
                               &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::SetBitTiming(units::nanosecond_t lowTime0,
@@ -72,25 +73,25 @@
   HAL_SetAddressableLEDBitTiming(
       m_handle, lowTime0.to<int32_t>(), highTime0.to<int32_t>(),
       lowTime1.to<int32_t>(), highTime1.to<int32_t>(), &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::SetSyncTime(units::microsecond_t syncTime) {
   int32_t status = 0;
   HAL_SetAddressableLEDSyncTime(m_handle, syncTime.to<int32_t>(), &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::Start() {
   int32_t status = 0;
   HAL_StartAddressableLEDOutput(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::Stop() {
   int32_t status = 0;
   HAL_StopAddressableLEDOutput(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void AddressableLED::LEDData::SetHSV(int h, int s, int v) {
diff --git a/wpilibc/src/main/native/cpp/AnalogAccelerometer.cpp b/wpilibc/src/main/native/cpp/AnalogAccelerometer.cpp
index 09bc2f5..0b39e64 100644
--- a/wpilibc/src/main/native/cpp/AnalogAccelerometer.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogAccelerometer.cpp
@@ -1,42 +1,37 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogAccelerometer.h"
 
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/Base.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
 AnalogAccelerometer::AnalogAccelerometer(int channel)
     : AnalogAccelerometer(std::make_shared<AnalogInput>(channel)) {
-  SendableRegistry::GetInstance().AddChild(this, m_analogInput.get());
+  wpi::SendableRegistry::AddChild(this, m_analogInput.get());
 }
 
 AnalogAccelerometer::AnalogAccelerometer(AnalogInput* channel)
-    : m_analogInput(channel, NullDeleter<AnalogInput>()) {
-  if (channel == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitAccelerometer();
+    : m_analogInput(channel, wpi::NullDeleter<AnalogInput>()) {
+  if (!channel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "channel");
   }
+  InitAccelerometer();
 }
 
 AnalogAccelerometer::AnalogAccelerometer(std::shared_ptr<AnalogInput> channel)
     : m_analogInput(channel) {
-  if (channel == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitAccelerometer();
+  if (!channel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "channel");
   }
+  InitAccelerometer();
 }
 
 double AnalogAccelerometer::GetAcceleration() const {
@@ -47,20 +42,20 @@
   m_voltsPerG = sensitivity;
 }
 
-void AnalogAccelerometer::SetZero(double zero) { m_zeroGVoltage = zero; }
+void AnalogAccelerometer::SetZero(double zero) {
+  m_zeroGVoltage = zero;
+}
 
-double AnalogAccelerometer::PIDGet() { return GetAcceleration(); }
-
-void AnalogAccelerometer::InitSendable(SendableBuilder& builder) {
+void AnalogAccelerometer::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Accelerometer");
   builder.AddDoubleProperty(
-      "Value", [=]() { return GetAcceleration(); }, nullptr);
+      "Value", [=] { return GetAcceleration(); }, nullptr);
 }
 
 void AnalogAccelerometer::InitAccelerometer() {
   HAL_Report(HALUsageReporting::kResourceType_Accelerometer,
              m_analogInput->GetChannel() + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "Accelerometer",
-                                        m_analogInput->GetChannel());
+  wpi::SendableRegistry::AddLW(this, "Accelerometer",
+                               m_analogInput->GetChannel());
 }
diff --git a/wpilibc/src/main/native/cpp/AnalogEncoder.cpp b/wpilibc/src/main/native/cpp/AnalogEncoder.cpp
index c1f4e8d..5f26e87 100644
--- a/wpilibc/src/main/native/cpp/AnalogEncoder.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogEncoder.cpp
@@ -1,29 +1,30 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogEncoder.h"
 
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+
 #include "frc/AnalogInput.h"
-#include "frc/Base.h"
 #include "frc/Counter.h"
-#include "frc/DriverStation.h"
-#include "frc/smartdashboard/SendableBuilder.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
+AnalogEncoder::AnalogEncoder(int channel)
+    : AnalogEncoder(std::make_shared<AnalogInput>(channel)) {}
+
 AnalogEncoder::AnalogEncoder(AnalogInput& analogInput)
-    : m_analogInput{&analogInput, NullDeleter<AnalogInput>{}},
+    : m_analogInput{&analogInput, wpi::NullDeleter<AnalogInput>{}},
       m_analogTrigger{m_analogInput.get()},
       m_counter{} {
   Init();
 }
 
 AnalogEncoder::AnalogEncoder(AnalogInput* analogInput)
-    : m_analogInput{analogInput, NullDeleter<AnalogInput>{}},
+    : m_analogInput{analogInput, wpi::NullDeleter<AnalogInput>{}},
       m_analogTrigger{m_analogInput.get()},
       m_counter{} {
   Init();
@@ -49,12 +50,14 @@
   m_counter.SetDownSource(
       m_analogTrigger.CreateOutput(AnalogTriggerType::kFallingPulse));
 
-  SendableRegistry::GetInstance().AddLW(this, "DutyCycle Encoder",
-                                        m_analogInput->GetChannel());
+  wpi::SendableRegistry::AddLW(this, "DutyCycle Encoder",
+                               m_analogInput->GetChannel());
 }
 
 units::turn_t AnalogEncoder::Get() const {
-  if (m_simPosition) return units::turn_t{m_simPosition.Get()};
+  if (m_simPosition) {
+    return units::turn_t{m_simPosition.Get()};
+  }
 
   // As the values are not atomic, keep trying until we get 2 reads of the same
   // value If we don't within 10 attempts, error
@@ -70,13 +73,16 @@
     }
   }
 
-  frc::DriverStation::GetInstance().ReportWarning(
+  FRC_ReportError(
+      warn::Warning, "{}",
       "Failed to read Analog Encoder. Potential Speed Overrun. Returning last "
       "value");
   return m_lastPosition;
 }
 
-double AnalogEncoder::GetPositionOffset() const { return m_positionOffset; }
+double AnalogEncoder::GetPositionOffset() const {
+  return m_positionOffset;
+}
 
 void AnalogEncoder::SetDistancePerRotation(double distancePerRotation) {
   m_distancePerRotation = distancePerRotation;
@@ -87,7 +93,7 @@
 }
 
 double AnalogEncoder::GetDistance() const {
-  return Get().to<double>() * GetDistancePerRotation();
+  return Get().value() * GetDistancePerRotation();
 }
 
 void AnalogEncoder::Reset() {
@@ -95,9 +101,11 @@
   m_positionOffset = m_analogInput->GetVoltage();
 }
 
-int AnalogEncoder::GetChannel() const { return m_analogInput->GetChannel(); }
+int AnalogEncoder::GetChannel() const {
+  return m_analogInput->GetChannel();
+}
 
-void AnalogEncoder::InitSendable(SendableBuilder& builder) {
+void AnalogEncoder::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("AbsoluteEncoder");
   builder.AddDoubleProperty(
       "Distance", [this] { return this->GetDistance(); }, nullptr);
diff --git a/wpilibc/src/main/native/cpp/AnalogGyro.cpp b/wpilibc/src/main/native/cpp/AnalogGyro.cpp
index 2ec4439..106293b 100644
--- a/wpilibc/src/main/native/cpp/AnalogGyro.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogGyro.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogGyro.h"
 
@@ -13,89 +10,83 @@
 #include <hal/AnalogGyro.h>
 #include <hal/Errors.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 #include "frc/AnalogInput.h"
-#include "frc/Base.h"
+#include "frc/Errors.h"
 #include "frc/Timer.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 AnalogGyro::AnalogGyro(int channel)
     : AnalogGyro(std::make_shared<AnalogInput>(channel)) {
-  SendableRegistry::GetInstance().AddChild(this, m_analog.get());
+  wpi::SendableRegistry::AddChild(this, m_analog.get());
 }
 
 AnalogGyro::AnalogGyro(AnalogInput* channel)
-    : AnalogGyro(
-          std::shared_ptr<AnalogInput>(channel, NullDeleter<AnalogInput>())) {}
+    : AnalogGyro(std::shared_ptr<AnalogInput>(
+          channel, wpi::NullDeleter<AnalogInput>())) {}
 
 AnalogGyro::AnalogGyro(std::shared_ptr<AnalogInput> channel)
     : m_analog(channel) {
-  if (channel == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitGyro();
-    Calibrate();
+  if (!channel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "channel");
   }
+  InitGyro();
+  Calibrate();
 }
 
 AnalogGyro::AnalogGyro(int channel, int center, double offset)
     : AnalogGyro(std::make_shared<AnalogInput>(channel), center, offset) {
-  SendableRegistry::GetInstance().AddChild(this, m_analog.get());
+  wpi::SendableRegistry::AddChild(this, m_analog.get());
 }
 
 AnalogGyro::AnalogGyro(std::shared_ptr<AnalogInput> channel, int center,
                        double offset)
     : m_analog(channel) {
-  if (channel == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitGyro();
-    int32_t status = 0;
-    HAL_SetAnalogGyroParameters(m_gyroHandle, kDefaultVoltsPerDegreePerSecond,
-                                offset, center, &status);
-    if (status != 0) {
-      wpi_setHALError(status);
-      m_gyroHandle = HAL_kInvalidHandle;
-      return;
-    }
-    Reset();
+  if (!channel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "channel");
   }
+  InitGyro();
+  int32_t status = 0;
+  HAL_SetAnalogGyroParameters(m_gyroHandle, kDefaultVoltsPerDegreePerSecond,
+                              offset, center, &status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
+  Reset();
 }
 
-AnalogGyro::~AnalogGyro() { HAL_FreeAnalogGyro(m_gyroHandle); }
+AnalogGyro::~AnalogGyro() {
+  HAL_FreeAnalogGyro(m_gyroHandle);
+}
 
 double AnalogGyro::GetAngle() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double value = HAL_GetAnalogGyroAngle(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
   return value;
 }
 
 double AnalogGyro::GetRate() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double value = HAL_GetAnalogGyroRate(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
   return value;
 }
 
 int AnalogGyro::GetCenter() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetAnalogGyroCenter(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
   return value;
 }
 
 double AnalogGyro::GetOffset() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double value = HAL_GetAnalogGyroOffset(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
   return value;
 }
 
@@ -103,65 +94,51 @@
   int32_t status = 0;
   HAL_SetAnalogGyroVoltsPerDegreePerSecond(m_gyroHandle,
                                            voltsPerDegreePerSecond, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
 }
 
 void AnalogGyro::SetDeadband(double volts) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogGyroDeadband(m_gyroHandle, volts, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
 }
 
 void AnalogGyro::Reset() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_ResetAnalogGyro(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
 }
 
 void AnalogGyro::InitGyro() {
-  if (StatusIsFatal()) return;
   if (m_gyroHandle == HAL_kInvalidHandle) {
     int32_t status = 0;
-    m_gyroHandle = HAL_InitializeAnalogGyro(m_analog->m_port, &status);
-    if (status == PARAMETER_OUT_OF_RANGE) {
-      wpi_setWPIErrorWithContext(ParameterOutOfRange,
-                                 " channel (must be accumulator channel)");
-      m_analog = nullptr;
-      m_gyroHandle = HAL_kInvalidHandle;
-      return;
-    }
-    if (status != 0) {
-      wpi_setHALError(status);
-      m_analog = nullptr;
-      m_gyroHandle = HAL_kInvalidHandle;
-      return;
-    }
+    std::string stackTrace = wpi::GetStackTrace(1);
+    m_gyroHandle =
+        HAL_InitializeAnalogGyro(m_analog->m_port, stackTrace.c_str(), &status);
+    FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
   }
 
   int32_t status = 0;
   HAL_SetupAnalogGyro(m_gyroHandle, &status);
-  if (status != 0) {
-    wpi_setHALError(status);
-    m_analog = nullptr;
-    m_gyroHandle = HAL_kInvalidHandle;
-    return;
-  }
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
 
   HAL_Report(HALUsageReporting::kResourceType_Gyro, m_analog->GetChannel() + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "AnalogGyro",
-                                        m_analog->GetChannel());
+  wpi::SendableRegistry::AddLW(this, "AnalogGyro", m_analog->GetChannel());
 }
 
 void AnalogGyro::Calibrate() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_CalibrateAnalogGyro(m_gyroHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_analog->GetChannel());
 }
 
 std::shared_ptr<AnalogInput> AnalogGyro::GetAnalogInput() const {
   return m_analog;
 }
+
+void AnalogGyro::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Gyro");
+  builder.AddDoubleProperty(
+      "Value", [=] { return GetAngle(); }, nullptr);
+}
diff --git a/wpilibc/src/main/native/cpp/AnalogInput.cpp b/wpilibc/src/main/native/cpp/AnalogInput.cpp
index 11c30ee..dfa5764 100644
--- a/wpilibc/src/main/native/cpp/AnalogInput.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogInput.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogInput.h"
 
@@ -12,222 +9,193 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
 #include "frc/Timer.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 AnalogInput::AnalogInput(int channel) {
   if (!SensorUtil::CheckAnalogInputChannel(channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "Analog Input " + wpi::Twine(channel));
-    return;
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", channel);
   }
 
   m_channel = channel;
 
   HAL_PortHandle port = HAL_GetPort(channel);
   int32_t status = 0;
-  m_port = HAL_InitializeAnalogInputPort(port, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumAnalogInputs(), channel);
-    m_channel = std::numeric_limits<int>::max();
-    m_port = HAL_kInvalidHandle;
-    return;
-  }
+  std::string stackTrace = wpi::GetStackTrace(1);
+  m_port = HAL_InitializeAnalogInputPort(port, stackTrace.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   HAL_Report(HALUsageReporting::kResourceType_AnalogChannel, channel + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "AnalogInput", channel);
+  wpi::SendableRegistry::AddLW(this, "AnalogInput", channel);
 }
 
-AnalogInput::~AnalogInput() { HAL_FreeAnalogInputPort(m_port); }
+AnalogInput::~AnalogInput() {
+  HAL_FreeAnalogInputPort(m_port);
+}
 
 int AnalogInput::GetValue() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetAnalogValue(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return value;
 }
 
 int AnalogInput::GetAverageValue() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetAnalogAverageValue(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return value;
 }
 
 double AnalogInput::GetVoltage() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double voltage = HAL_GetAnalogVoltage(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return voltage;
 }
 
 double AnalogInput::GetAverageVoltage() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double voltage = HAL_GetAnalogAverageVoltage(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return voltage;
 }
 
 int AnalogInput::GetChannel() const {
-  if (StatusIsFatal()) return 0;
   return m_channel;
 }
 
 void AnalogInput::SetAverageBits(int bits) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogAverageBits(m_port, bits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 int AnalogInput::GetAverageBits() const {
   int32_t status = 0;
   int averageBits = HAL_GetAnalogAverageBits(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return averageBits;
 }
 
 void AnalogInput::SetOversampleBits(int bits) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogOversampleBits(m_port, bits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 int AnalogInput::GetOversampleBits() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int oversampleBits = HAL_GetAnalogOversampleBits(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return oversampleBits;
 }
 
 int AnalogInput::GetLSBWeight() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int lsbWeight = HAL_GetAnalogLSBWeight(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return lsbWeight;
 }
 
 int AnalogInput::GetOffset() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int offset = HAL_GetAnalogOffset(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return offset;
 }
 
 bool AnalogInput::IsAccumulatorChannel() const {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool isAccum = HAL_IsAccumulatorChannel(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return isAccum;
 }
 
 void AnalogInput::InitAccumulator() {
-  if (StatusIsFatal()) return;
   m_accumulatorOffset = 0;
   int32_t status = 0;
   HAL_InitAccumulator(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void AnalogInput::SetAccumulatorInitialValue(int64_t initialValue) {
-  if (StatusIsFatal()) return;
   m_accumulatorOffset = initialValue;
 }
 
 void AnalogInput::ResetAccumulator() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_ResetAccumulator(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
-  if (!StatusIsFatal()) {
-    // Wait until the next sample, so the next call to GetAccumulator*()
-    // won't have old values.
-    const double sampleTime = 1.0 / GetSampleRate();
-    const double overSamples = 1 << GetOversampleBits();
-    const double averageSamples = 1 << GetAverageBits();
-    Wait(sampleTime * overSamples * averageSamples);
-  }
+  // Wait until the next sample, so the next call to GetAccumulator*()
+  // won't have old values.
+  const double sampleTime = 1.0 / GetSampleRate();
+  const double overSamples = 1 << GetOversampleBits();
+  const double averageSamples = 1 << GetAverageBits();
+  Wait(units::second_t{sampleTime * overSamples * averageSamples});
 }
 
 void AnalogInput::SetAccumulatorCenter(int center) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAccumulatorCenter(m_port, center, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void AnalogInput::SetAccumulatorDeadband(int deadband) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAccumulatorDeadband(m_port, deadband, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 int64_t AnalogInput::GetAccumulatorValue() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int64_t value = HAL_GetAccumulatorValue(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return value + m_accumulatorOffset;
 }
 
 int64_t AnalogInput::GetAccumulatorCount() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int64_t count = HAL_GetAccumulatorCount(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return count;
 }
 
 void AnalogInput::GetAccumulatorOutput(int64_t& value, int64_t& count) const {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_GetAccumulatorOutput(m_port, &value, &count, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   value += m_accumulatorOffset;
 }
 
 void AnalogInput::SetSampleRate(double samplesPerSecond) {
   int32_t status = 0;
   HAL_SetAnalogSampleRate(samplesPerSecond, &status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetSampleRate");
 }
 
 double AnalogInput::GetSampleRate() {
   int32_t status = 0;
   double sampleRate = HAL_GetAnalogSampleRate(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetSampleRate");
   return sampleRate;
 }
 
-double AnalogInput::PIDGet() {
-  if (StatusIsFatal()) return 0.0;
-  return GetAverageVoltage();
-}
-
 void AnalogInput::SetSimDevice(HAL_SimDeviceHandle device) {
   HAL_SetAnalogInputSimDevice(m_port, device);
 }
 
-void AnalogInput::InitSendable(SendableBuilder& builder) {
+void AnalogInput::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Analog Input");
   builder.AddDoubleProperty(
-      "Value", [=]() { return GetAverageVoltage(); }, nullptr);
+      "Value", [=] { return GetAverageVoltage(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/AnalogOutput.cpp b/wpilibc/src/main/native/cpp/AnalogOutput.cpp
index bd8126a..a391271 100644
--- a/wpilibc/src/main/native/cpp/AnalogOutput.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogOutput.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogOutput.h"
 
@@ -14,62 +11,56 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 AnalogOutput::AnalogOutput(int channel) {
   if (!SensorUtil::CheckAnalogOutputChannel(channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "analog output " + wpi::Twine(channel));
-    m_channel = std::numeric_limits<int>::max();
-    m_port = HAL_kInvalidHandle;
-    return;
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", channel);
   }
 
   m_channel = channel;
 
   HAL_PortHandle port = HAL_GetPort(m_channel);
   int32_t status = 0;
-  m_port = HAL_InitializeAnalogOutputPort(port, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumAnalogOutputs(), channel);
-    m_channel = std::numeric_limits<int>::max();
-    m_port = HAL_kInvalidHandle;
-    return;
-  }
+  std::string stackTrace = wpi::GetStackTrace(1);
+  m_port = HAL_InitializeAnalogOutputPort(port, stackTrace.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   HAL_Report(HALUsageReporting::kResourceType_AnalogOutput, m_channel + 1);
-  SendableRegistry::GetInstance().AddLW(this, "AnalogOutput", m_channel);
+  wpi::SendableRegistry::AddLW(this, "AnalogOutput", m_channel);
 }
 
-AnalogOutput::~AnalogOutput() { HAL_FreeAnalogOutputPort(m_port); }
+AnalogOutput::~AnalogOutput() {
+  HAL_FreeAnalogOutputPort(m_port);
+}
 
 void AnalogOutput::SetVoltage(double voltage) {
   int32_t status = 0;
   HAL_SetAnalogOutput(m_port, voltage, &status);
-
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 double AnalogOutput::GetVoltage() const {
   int32_t status = 0;
   double voltage = HAL_GetAnalogOutput(m_port, &status);
-
-  wpi_setHALError(status);
-
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return voltage;
 }
 
-int AnalogOutput::GetChannel() const { return m_channel; }
+int AnalogOutput::GetChannel() const {
+  return m_channel;
+}
 
-void AnalogOutput::InitSendable(SendableBuilder& builder) {
+void AnalogOutput::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Analog Output");
   builder.AddDoubleProperty(
-      "Value", [=]() { return GetVoltage(); },
+      "Value", [=] { return GetVoltage(); },
       [=](double value) { SetVoltage(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/AnalogPotentiometer.cpp b/wpilibc/src/main/native/cpp/AnalogPotentiometer.cpp
index c7aedd6..ba94613 100644
--- a/wpilibc/src/main/native/cpp/AnalogPotentiometer.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogPotentiometer.cpp
@@ -1,16 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogPotentiometer.h"
 
-#include "frc/Base.h"
+#include <utility>
+
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
 #include "frc/RobotController.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
@@ -18,20 +18,22 @@
                                          double offset)
     : AnalogPotentiometer(std::make_shared<AnalogInput>(channel), fullRange,
                           offset) {
-  SendableRegistry::GetInstance().AddChild(this, m_analog_input.get());
+  wpi::SendableRegistry::AddChild(this, m_analog_input.get());
 }
 
 AnalogPotentiometer::AnalogPotentiometer(AnalogInput* input, double fullRange,
                                          double offset)
     : AnalogPotentiometer(
-          std::shared_ptr<AnalogInput>(input, NullDeleter<AnalogInput>()),
+          std::shared_ptr<AnalogInput>(input, wpi::NullDeleter<AnalogInput>()),
           fullRange, offset) {}
 
 AnalogPotentiometer::AnalogPotentiometer(std::shared_ptr<AnalogInput> input,
                                          double fullRange, double offset)
-    : m_analog_input(input), m_fullRange(fullRange), m_offset(offset) {
-  SendableRegistry::GetInstance().AddLW(this, "AnalogPotentiometer",
-                                        m_analog_input->GetChannel());
+    : m_analog_input(std::move(input)),
+      m_fullRange(fullRange),
+      m_offset(offset) {
+  wpi::SendableRegistry::AddLW(this, "AnalogPotentiometer",
+                               m_analog_input->GetChannel());
 }
 
 double AnalogPotentiometer::Get() const {
@@ -41,10 +43,8 @@
          m_offset;
 }
 
-double AnalogPotentiometer::PIDGet() { return Get(); }
-
-void AnalogPotentiometer::InitSendable(SendableBuilder& builder) {
+void AnalogPotentiometer::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Analog Input");
   builder.AddDoubleProperty(
-      "Value", [=]() { return Get(); }, nullptr);
+      "Value", [=] { return Get(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/AnalogTrigger.cpp b/wpilibc/src/main/native/cpp/AnalogTrigger.cpp
index 45821ba..ea33c73 100644
--- a/wpilibc/src/main/native/cpp/AnalogTrigger.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogTrigger.cpp
@@ -1,156 +1,129 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogTrigger.h"
 
 #include <utility>
 
+#include <hal/AnalogTrigger.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 #include "frc/AnalogInput.h"
-#include "frc/Base.h"
 #include "frc/DutyCycle.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
 AnalogTrigger::AnalogTrigger(int channel)
     : AnalogTrigger(new AnalogInput(channel)) {
   m_ownsAnalog = true;
-  SendableRegistry::GetInstance().AddChild(this, m_analogInput);
+  wpi::SendableRegistry::AddChild(this, m_analogInput);
 }
 
 AnalogTrigger::AnalogTrigger(AnalogInput* input) {
   m_analogInput = input;
   int32_t status = 0;
   m_trigger = HAL_InitializeAnalogTrigger(input->m_port, &status);
-  if (status != 0) {
-    wpi_setHALError(status);
-    m_trigger = HAL_kInvalidHandle;
-    return;
-  }
+  FRC_CheckErrorStatus(status, "Channel {}", input->GetChannel());
   int index = GetIndex();
 
   HAL_Report(HALUsageReporting::kResourceType_AnalogTrigger, index + 1);
-  SendableRegistry::GetInstance().AddLW(this, "AnalogTrigger", index);
+  wpi::SendableRegistry::AddLW(this, "AnalogTrigger", index);
 }
 
 AnalogTrigger::AnalogTrigger(DutyCycle* input) {
   m_dutyCycle = input;
   int32_t status = 0;
   m_trigger = HAL_InitializeAnalogTriggerDutyCycle(input->m_handle, &status);
-  if (status != 0) {
-    wpi_setHALError(status);
-    m_trigger = HAL_kInvalidHandle;
-    return;
-  }
+  FRC_CheckErrorStatus(status, "Channel {}", m_dutyCycle->GetSourceChannel());
   int index = GetIndex();
 
   HAL_Report(HALUsageReporting::kResourceType_AnalogTrigger, index + 1);
-  SendableRegistry::GetInstance().AddLW(this, "AnalogTrigger", index);
+  wpi::SendableRegistry::AddLW(this, "AnalogTrigger", index);
 }
 
 AnalogTrigger::~AnalogTrigger() {
   int32_t status = 0;
   HAL_CleanAnalogTrigger(m_trigger, &status);
+  FRC_ReportError(status, "Channel {}", GetSourceChannel());
 
   if (m_ownsAnalog) {
     delete m_analogInput;
   }
 }
 
-AnalogTrigger::AnalogTrigger(AnalogTrigger&& rhs)
-    : ErrorBase(std::move(rhs)),
-      SendableHelper(std::move(rhs)),
-      m_trigger(std::move(rhs.m_trigger)) {
-  std::swap(m_analogInput, rhs.m_analogInput);
-  std::swap(m_dutyCycle, rhs.m_dutyCycle);
-  std::swap(m_ownsAnalog, rhs.m_ownsAnalog);
-}
-
-AnalogTrigger& AnalogTrigger::operator=(AnalogTrigger&& rhs) {
-  ErrorBase::operator=(std::move(rhs));
-  SendableHelper::operator=(std::move(rhs));
-
-  m_trigger = std::move(rhs.m_trigger);
-  std::swap(m_analogInput, rhs.m_analogInput);
-  std::swap(m_dutyCycle, rhs.m_dutyCycle);
-  std::swap(m_ownsAnalog, rhs.m_ownsAnalog);
-
-  return *this;
-}
-
 void AnalogTrigger::SetLimitsVoltage(double lower, double upper) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogTriggerLimitsVoltage(m_trigger, lower, upper, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
 }
 
 void AnalogTrigger::SetLimitsDutyCycle(double lower, double upper) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogTriggerLimitsDutyCycle(m_trigger, lower, upper, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
 }
 
 void AnalogTrigger::SetLimitsRaw(int lower, int upper) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogTriggerLimitsRaw(m_trigger, lower, upper, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
 }
 
 void AnalogTrigger::SetAveraged(bool useAveragedValue) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogTriggerAveraged(m_trigger, useAveragedValue, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
 }
 
 void AnalogTrigger::SetFiltered(bool useFilteredValue) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetAnalogTriggerFiltered(m_trigger, useFilteredValue, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
 }
 
 int AnalogTrigger::GetIndex() const {
-  if (StatusIsFatal()) return -1;
   int32_t status = 0;
   auto ret = HAL_GetAnalogTriggerFPGAIndex(m_trigger, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return ret;
 }
 
 bool AnalogTrigger::GetInWindow() {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool result = HAL_GetAnalogTriggerInWindow(m_trigger, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return result;
 }
 
 bool AnalogTrigger::GetTriggerState() {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool result = HAL_GetAnalogTriggerTriggerState(m_trigger, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return result;
 }
 
 std::shared_ptr<AnalogTriggerOutput> AnalogTrigger::CreateOutput(
     AnalogTriggerType type) const {
-  if (StatusIsFatal()) return nullptr;
   return std::shared_ptr<AnalogTriggerOutput>(
-      new AnalogTriggerOutput(*this, type), NullDeleter<AnalogTriggerOutput>());
+      new AnalogTriggerOutput(*this, type));
 }
 
-void AnalogTrigger::InitSendable(SendableBuilder& builder) {
-  if (m_ownsAnalog) m_analogInput->InitSendable(builder);
+void AnalogTrigger::InitSendable(wpi::SendableBuilder& builder) {
+  if (m_ownsAnalog) {
+    m_analogInput->InitSendable(builder);
+  }
+}
+
+int AnalogTrigger::GetSourceChannel() const {
+  if (m_analogInput) {
+    return m_analogInput->GetChannel();
+  } else if (m_dutyCycle) {
+    return m_dutyCycle->GetSourceChannel();
+  } else {
+    return -1;
+  }
 }
diff --git a/wpilibc/src/main/native/cpp/AnalogTriggerOutput.cpp b/wpilibc/src/main/native/cpp/AnalogTriggerOutput.cpp
index 8fba479..93d1969 100644
--- a/wpilibc/src/main/native/cpp/AnalogTriggerOutput.cpp
+++ b/wpilibc/src/main/native/cpp/AnalogTriggerOutput.cpp
@@ -1,16 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/AnalogTriggerOutput.h"
 
+#include <hal/AnalogTrigger.h>
 #include <hal/FRCUsageReporting.h>
 
 #include "frc/AnalogTrigger.h"
-#include "frc/WPIErrors.h"
+#include "frc/AnalogTriggerType.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -19,7 +18,7 @@
   bool result = HAL_GetAnalogTriggerOutput(
       m_trigger->m_trigger, static_cast<HAL_AnalogTriggerType>(m_outputType),
       &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Get");
   return result;
 }
 
@@ -31,11 +30,15 @@
   return m_outputType;
 }
 
-bool AnalogTriggerOutput::IsAnalogTrigger() const { return true; }
+bool AnalogTriggerOutput::IsAnalogTrigger() const {
+  return true;
+}
 
-int AnalogTriggerOutput::GetChannel() const { return m_trigger->GetIndex(); }
+int AnalogTriggerOutput::GetChannel() const {
+  return m_trigger->GetIndex();
+}
 
-void AnalogTriggerOutput::InitSendable(SendableBuilder&) {}
+void AnalogTriggerOutput::InitSendable(wpi::SendableBuilder&) {}
 
 AnalogTriggerOutput::AnalogTriggerOutput(const AnalogTrigger& trigger,
                                          AnalogTriggerType outputType)
diff --git a/wpilibc/src/main/native/cpp/AsynchronousInterrupt.cpp b/wpilibc/src/main/native/cpp/AsynchronousInterrupt.cpp
new file mode 100644
index 0000000..d45d5e4
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/AsynchronousInterrupt.cpp
@@ -0,0 +1,67 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/AsynchronousInterrupt.h"
+
+#include <frc/DigitalSource.h>
+
+using namespace frc;
+
+AsynchronousInterrupt::AsynchronousInterrupt(
+    DigitalSource& source, std::function<void(bool, bool)> callback)
+    : m_interrupt{source}, m_callback{std::move(callback)} {}
+AsynchronousInterrupt::AsynchronousInterrupt(
+    DigitalSource* source, std::function<void(bool, bool)> callback)
+    : m_interrupt{source}, m_callback{std::move(callback)} {}
+AsynchronousInterrupt::AsynchronousInterrupt(
+    std::shared_ptr<DigitalSource> source,
+    std::function<void(bool, bool)> callback)
+    : m_interrupt{source}, m_callback{std::move(callback)} {}
+
+AsynchronousInterrupt::~AsynchronousInterrupt() {
+  Disable();
+}
+
+void AsynchronousInterrupt::ThreadMain() {
+  while (m_keepRunning) {
+    auto result = m_interrupt.WaitForInterrupt(10_s, false);
+    if (!m_keepRunning) {
+      break;
+    }
+    if (result == SynchronousInterrupt::WaitResult::kTimeout) {
+      continue;
+    }
+    m_callback((result & SynchronousInterrupt::WaitResult::kRisingEdge) != 0,
+               (result & SynchronousInterrupt::WaitResult::kFallingEdge) != 0);
+  }
+}
+
+void AsynchronousInterrupt::Enable() {
+  if (m_keepRunning) {
+    return;
+  }
+
+  m_keepRunning = true;
+  m_thread = std::thread([this] { this->ThreadMain(); });
+}
+
+void AsynchronousInterrupt::Disable() {
+  m_keepRunning = false;
+  m_interrupt.WakeupWaitingInterrupt();
+  if (m_thread.joinable()) {
+    m_thread.join();
+  }
+}
+
+void AsynchronousInterrupt::SetInterruptEdges(bool risingEdge,
+                                              bool fallingEdge) {
+  m_interrupt.SetInterruptEdges(risingEdge, fallingEdge);
+}
+
+units::second_t AsynchronousInterrupt::GetRisingTimestamp() {
+  return m_interrupt.GetRisingTimestamp();
+}
+units::second_t AsynchronousInterrupt::GetFallingTimestamp() {
+  return m_interrupt.GetFallingTimestamp();
+}
diff --git a/wpilibc/src/main/native/cpp/BuiltInAccelerometer.cpp b/wpilibc/src/main/native/cpp/BuiltInAccelerometer.cpp
index efc0fe6..1b8da85 100644
--- a/wpilibc/src/main/native/cpp/BuiltInAccelerometer.cpp
+++ b/wpilibc/src/main/native/cpp/BuiltInAccelerometer.cpp
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/BuiltInAccelerometer.h"
 
 #include <hal/Accelerometer.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -21,32 +18,38 @@
 
   HAL_Report(HALUsageReporting::kResourceType_Accelerometer, 0, 0,
              "Built-in accelerometer");
-  SendableRegistry::GetInstance().AddLW(this, "BuiltInAccel");
+  wpi::SendableRegistry::AddLW(this, "BuiltInAccel");
 }
 
 void BuiltInAccelerometer::SetRange(Range range) {
   if (range == kRange_16G) {
-    wpi_setWPIErrorWithContext(
-        ParameterOutOfRange, "16G range not supported (use k2G, k4G, or k8G)");
+    throw FRC_MakeError(err::ParameterOutOfRange, "{}",
+                        "16G range not supported (use k2G, k4G, or k8G)");
   }
 
   HAL_SetAccelerometerActive(false);
-  HAL_SetAccelerometerRange((HAL_AccelerometerRange)range);
+  HAL_SetAccelerometerRange(static_cast<HAL_AccelerometerRange>(range));
   HAL_SetAccelerometerActive(true);
 }
 
-double BuiltInAccelerometer::GetX() { return HAL_GetAccelerometerX(); }
+double BuiltInAccelerometer::GetX() {
+  return HAL_GetAccelerometerX();
+}
 
-double BuiltInAccelerometer::GetY() { return HAL_GetAccelerometerY(); }
+double BuiltInAccelerometer::GetY() {
+  return HAL_GetAccelerometerY();
+}
 
-double BuiltInAccelerometer::GetZ() { return HAL_GetAccelerometerZ(); }
+double BuiltInAccelerometer::GetZ() {
+  return HAL_GetAccelerometerZ();
+}
 
-void BuiltInAccelerometer::InitSendable(SendableBuilder& builder) {
+void BuiltInAccelerometer::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("3AxisAccelerometer");
   builder.AddDoubleProperty(
-      "X", [=]() { return GetX(); }, nullptr);
+      "X", [=] { return GetX(); }, nullptr);
   builder.AddDoubleProperty(
-      "Y", [=]() { return GetY(); }, nullptr);
+      "Y", [=] { return GetY(); }, nullptr);
   builder.AddDoubleProperty(
-      "Z", [=]() { return GetZ(); }, nullptr);
+      "Z", [=] { return GetZ(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/CAN.cpp b/wpilibc/src/main/native/cpp/CAN.cpp
index e56e435..e26ca37 100644
--- a/wpilibc/src/main/native/cpp/CAN.cpp
+++ b/wpilibc/src/main/native/cpp/CAN.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/CAN.h"
 
@@ -14,17 +11,15 @@
 #include <hal/Errors.h>
 #include <hal/FRCUsageReporting.h>
 
+#include "frc/Errors.h"
+
 using namespace frc;
 
 CAN::CAN(int deviceId) {
   int32_t status = 0;
   m_handle =
       HAL_InitializeCAN(kTeamManufacturer, deviceId, kTeamDeviceType, &status);
-  if (status != 0) {
-    wpi_setHALError(status);
-    m_handle = HAL_kInvalidHandle;
-    return;
-  }
+  FRC_CheckErrorStatus(status, "device id {}", deviceId);
 
   HAL_Report(HALUsageReporting::kResourceType_CAN, deviceId + 1);
 }
@@ -34,17 +29,13 @@
   m_handle = HAL_InitializeCAN(
       static_cast<HAL_CANManufacturer>(deviceManufacturer), deviceId,
       static_cast<HAL_CANDeviceType>(deviceType), &status);
-  if (status != 0) {
-    wpi_setHALError(status);
-    m_handle = HAL_kInvalidHandle;
-    return;
-  }
+  FRC_CheckErrorStatus(status, "device id {} mfg {} type {}", deviceId,
+                       deviceManufacturer, deviceType);
 
   HAL_Report(HALUsageReporting::kResourceType_CAN, deviceId + 1);
 }
 
 CAN::~CAN() {
-  if (StatusIsFatal()) return;
   if (m_handle != HAL_kInvalidHandle) {
     HAL_CleanCAN(m_handle);
     m_handle = HAL_kInvalidHandle;
@@ -54,20 +45,20 @@
 void CAN::WritePacket(const uint8_t* data, int length, int apiId) {
   int32_t status = 0;
   HAL_WriteCANPacket(m_handle, data, length, apiId, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "WritePacket");
 }
 
 void CAN::WritePacketRepeating(const uint8_t* data, int length, int apiId,
                                int repeatMs) {
   int32_t status = 0;
   HAL_WriteCANPacketRepeating(m_handle, data, length, apiId, repeatMs, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "WritePacketRepeating");
 }
 
 void CAN::WriteRTRFrame(int length, int apiId) {
   int32_t status = 0;
   HAL_WriteCANRTRFrame(m_handle, length, apiId, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "WriteRTRFrame");
 }
 
 int CAN::WritePacketNoError(const uint8_t* data, int length, int apiId) {
@@ -92,7 +83,7 @@
 void CAN::StopPacketRepeating(int apiId) {
   int32_t status = 0;
   HAL_StopCANPacketRepeating(m_handle, apiId, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "StopPacketRepeating");
 }
 
 bool CAN::ReadPacketNew(int apiId, CANData* data) {
@@ -103,7 +94,7 @@
     return false;
   }
   if (status != 0) {
-    wpi_setHALError(status);
+    FRC_CheckErrorStatus(status, "{}", "ReadPacketNew");
     return false;
   } else {
     return true;
@@ -118,7 +109,7 @@
     return false;
   }
   if (status != 0) {
-    wpi_setHALError(status);
+    FRC_CheckErrorStatus(status, "{}", "ReadPacketLatest");
     return false;
   } else {
     return true;
@@ -134,7 +125,7 @@
     return false;
   }
   if (status != 0) {
-    wpi_setHALError(status);
+    FRC_CheckErrorStatus(status, "{}", "ReadPacketTimeout");
     return false;
   } else {
     return true;
diff --git a/wpilibc/src/main/native/cpp/Compressor.cpp b/wpilibc/src/main/native/cpp/Compressor.cpp
index e40758f..0302acb 100644
--- a/wpilibc/src/main/native/cpp/Compressor.cpp
+++ b/wpilibc/src/main/native/cpp/Compressor.cpp
@@ -1,221 +1,72 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Compressor.h"
 
-#include <hal/Compressor.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/Ports.h>
-#include <hal/Solenoid.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
-Compressor::Compressor(int pcmID) : m_module(pcmID) {
-  int32_t status = 0;
-  m_compressorHandle = HAL_InitializeCompressor(m_module, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumPCMModules(), pcmID);
-    return;
+Compressor::Compressor(int module, PneumaticsModuleType moduleType)
+    : m_module{PneumaticsBase::GetForType(module, moduleType)} {
+  if (!m_module->ReserveCompressor()) {
+    throw FRC_MakeError(err::ResourceAlreadyAllocated, "{}", module);
   }
+
   SetClosedLoopControl(true);
 
-  HAL_Report(HALUsageReporting::kResourceType_Compressor, pcmID + 1);
-  SendableRegistry::GetInstance().AddLW(this, "Compressor", pcmID);
+  HAL_Report(HALUsageReporting::kResourceType_Compressor, module + 1);
+  wpi::SendableRegistry::AddLW(this, "Compressor", module);
+}
+
+Compressor::Compressor(PneumaticsModuleType moduleType)
+    : Compressor{PneumaticsBase::GetDefaultForType(moduleType), moduleType} {}
+
+Compressor::~Compressor() {
+  m_module->UnreserveCompressor();
 }
 
 void Compressor::Start() {
-  if (StatusIsFatal()) return;
   SetClosedLoopControl(true);
 }
 
 void Compressor::Stop() {
-  if (StatusIsFatal()) return;
   SetClosedLoopControl(false);
 }
 
 bool Compressor::Enabled() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressor(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
+  return m_module->GetCompressor();
 }
 
 bool Compressor::GetPressureSwitchValue() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorPressureSwitch(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
+  return m_module->GetPressureSwitch();
 }
 
 double Compressor::GetCompressorCurrent() const {
-  if (StatusIsFatal()) return 0;
-  int32_t status = 0;
-  double value;
-
-  value = HAL_GetCompressorCurrent(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
+  return m_module->GetCompressorCurrent();
 }
 
 void Compressor::SetClosedLoopControl(bool on) {
-  if (StatusIsFatal()) return;
-  int32_t status = 0;
-
-  HAL_SetCompressorClosedLoopControl(m_compressorHandle, on, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
+  m_module->SetClosedLoopControl(on);
 }
 
 bool Compressor::GetClosedLoopControl() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorClosedLoopControl(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
+  return m_module->GetClosedLoopControl();
 }
 
-bool Compressor::GetCompressorCurrentTooHighFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorCurrentTooHighFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-bool Compressor::GetCompressorCurrentTooHighStickyFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value =
-      HAL_GetCompressorCurrentTooHighStickyFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-bool Compressor::GetCompressorShortedStickyFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorShortedStickyFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-bool Compressor::GetCompressorShortedFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorShortedFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-bool Compressor::GetCompressorNotConnectedStickyFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorNotConnectedStickyFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-bool Compressor::GetCompressorNotConnectedFault() const {
-  if (StatusIsFatal()) return false;
-  int32_t status = 0;
-  bool value;
-
-  value = HAL_GetCompressorNotConnectedFault(m_compressorHandle, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-
-  return value;
-}
-
-void Compressor::ClearAllPCMStickyFaults() {
-  if (StatusIsFatal()) return;
-  int32_t status = 0;
-
-  HAL_ClearAllPCMStickyFaults(m_module, &status);
-
-  if (status) {
-    wpi_setWPIError(Timeout);
-  }
-}
-
-int Compressor::GetModule() const { return m_module; }
-
-void Compressor::InitSendable(SendableBuilder& builder) {
+void Compressor::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Compressor");
   builder.AddBooleanProperty(
-      "Enabled", [=]() { return Enabled(); },
-      [=](bool value) {
-        if (value)
-          Start();
-        else
-          Stop();
-      });
+      "Closed Loop Control", [=]() { return GetClosedLoopControl(); },
+      [=](bool value) { SetClosedLoopControl(value); });
+  builder.AddBooleanProperty(
+      "Enabled", [=] { return Enabled(); }, nullptr);
   builder.AddBooleanProperty(
       "Pressure switch", [=]() { return GetPressureSwitchValue(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/Counter.cpp b/wpilibc/src/main/native/cpp/Counter.cpp
index ca74ab8..a1ad9e7 100644
--- a/wpilibc/src/main/native/cpp/Counter.cpp
+++ b/wpilibc/src/main/native/cpp/Counter.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Counter.h"
 
@@ -11,25 +8,26 @@
 
 #include <hal/Counter.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 #include "frc/AnalogTrigger.h"
-#include "frc/Base.h"
 #include "frc/DigitalInput.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
 Counter::Counter(Mode mode) {
   int32_t status = 0;
-  m_counter = HAL_InitializeCounter((HAL_Counter_Mode)mode, &m_index, &status);
-  wpi_setHALError(status);
+  m_counter = HAL_InitializeCounter(static_cast<HAL_Counter_Mode>(mode),
+                                    &m_index, &status);
+  FRC_CheckErrorStatus(status, "{}", "InitializeCounter");
 
-  SetMaxPeriod(0.5);
+  SetMaxPeriod(0.5_s);
 
   HAL_Report(HALUsageReporting::kResourceType_Counter, m_index + 1, mode + 1);
-  SendableRegistry::GetInstance().AddLW(this, "Counter", m_index);
+  wpi::SendableRegistry::AddLW(this, "Counter", m_index);
 }
 
 Counter::Counter(int channel) : Counter(kTwoPulse) {
@@ -56,9 +54,9 @@
                  DigitalSource* downSource, bool inverted)
     : Counter(encodingType,
               std::shared_ptr<DigitalSource>(upSource,
-                                             NullDeleter<DigitalSource>()),
+                                             wpi::NullDeleter<DigitalSource>()),
               std::shared_ptr<DigitalSource>(downSource,
-                                             NullDeleter<DigitalSource>()),
+                                             wpi::NullDeleter<DigitalSource>()),
               inverted) {}
 
 Counter::Counter(EncodingType encodingType,
@@ -66,10 +64,8 @@
                  std::shared_ptr<DigitalSource> downSource, bool inverted)
     : Counter(kExternalDirection) {
   if (encodingType != k1X && encodingType != k2X) {
-    wpi_setWPIErrorWithContext(
-        ParameterOutOfRange,
-        "Counter only supports 1X and 2X quadrature decoding.");
-    return;
+    throw FRC_MakeError(err::ParameterOutOfRange, "{}",
+                        "Counter only supports 1X and 2X quadrature decoding");
   }
   SetUpSource(upSource);
   SetDownSource(downSource);
@@ -83,256 +79,235 @@
     HAL_SetCounterAverageSize(m_counter, 2, &status);
   }
 
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Counter constructor");
   SetDownSourceEdge(inverted, true);
 }
 
 Counter::~Counter() {
-  SetUpdateWhenEmpty(true);
+  try {
+    SetUpdateWhenEmpty(true);
+  } catch (const RuntimeError& e) {
+    e.Report();
+  }
 
   int32_t status = 0;
   HAL_FreeCounter(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "{}", "Counter destructor");
 }
 
 void Counter::SetUpSource(int channel) {
-  if (StatusIsFatal()) return;
   SetUpSource(std::make_shared<DigitalInput>(channel));
-  SendableRegistry::GetInstance().AddChild(this, m_upSource.get());
+  wpi::SendableRegistry::AddChild(this, m_upSource.get());
 }
 
 void Counter::SetUpSource(AnalogTrigger* analogTrigger,
                           AnalogTriggerType triggerType) {
   SetUpSource(std::shared_ptr<AnalogTrigger>(analogTrigger,
-                                             NullDeleter<AnalogTrigger>()),
+                                             wpi::NullDeleter<AnalogTrigger>()),
               triggerType);
 }
 
 void Counter::SetUpSource(std::shared_ptr<AnalogTrigger> analogTrigger,
                           AnalogTriggerType triggerType) {
-  if (StatusIsFatal()) return;
   SetUpSource(analogTrigger->CreateOutput(triggerType));
 }
 
 void Counter::SetUpSource(DigitalSource* source) {
-  SetUpSource(
-      std::shared_ptr<DigitalSource>(source, NullDeleter<DigitalSource>()));
+  SetUpSource(std::shared_ptr<DigitalSource>(
+      source, wpi::NullDeleter<DigitalSource>()));
 }
 
 void Counter::SetUpSource(std::shared_ptr<DigitalSource> source) {
-  if (StatusIsFatal()) return;
   m_upSource = source;
-  if (m_upSource->StatusIsFatal()) {
-    CloneError(*m_upSource);
-  } else {
-    int32_t status = 0;
-    HAL_SetCounterUpSource(
-        m_counter, source->GetPortHandleForRouting(),
-        (HAL_AnalogTriggerType)source->GetAnalogTriggerTypeForRouting(),
-        &status);
-    wpi_setHALError(status);
-  }
+  int32_t status = 0;
+  HAL_SetCounterUpSource(m_counter, source->GetPortHandleForRouting(),
+                         static_cast<HAL_AnalogTriggerType>(
+                             source->GetAnalogTriggerTypeForRouting()),
+                         &status);
+  FRC_CheckErrorStatus(status, "{}", "SetUpSource");
 }
 
 void Counter::SetUpSource(DigitalSource& source) {
-  SetUpSource(
-      std::shared_ptr<DigitalSource>(&source, NullDeleter<DigitalSource>()));
+  SetUpSource(std::shared_ptr<DigitalSource>(
+      &source, wpi::NullDeleter<DigitalSource>()));
 }
 
 void Counter::SetUpSourceEdge(bool risingEdge, bool fallingEdge) {
-  if (StatusIsFatal()) return;
   if (m_upSource == nullptr) {
-    wpi_setWPIErrorWithContext(
-        NullParameter,
+    throw FRC_MakeError(
+        err::NullParameter, "{}",
         "Must set non-nullptr UpSource before setting UpSourceEdge");
   }
   int32_t status = 0;
   HAL_SetCounterUpSourceEdge(m_counter, risingEdge, fallingEdge, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetUpSourceEdge");
 }
 
 void Counter::ClearUpSource() {
-  if (StatusIsFatal()) return;
   m_upSource.reset();
   int32_t status = 0;
   HAL_ClearCounterUpSource(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "ClearUpSource");
 }
 
 void Counter::SetDownSource(int channel) {
-  if (StatusIsFatal()) return;
   SetDownSource(std::make_shared<DigitalInput>(channel));
-  SendableRegistry::GetInstance().AddChild(this, m_downSource.get());
+  wpi::SendableRegistry::AddChild(this, m_downSource.get());
 }
 
 void Counter::SetDownSource(AnalogTrigger* analogTrigger,
                             AnalogTriggerType triggerType) {
-  SetDownSource(std::shared_ptr<AnalogTrigger>(analogTrigger,
-                                               NullDeleter<AnalogTrigger>()),
+  SetDownSource(std::shared_ptr<AnalogTrigger>(
+                    analogTrigger, wpi::NullDeleter<AnalogTrigger>()),
                 triggerType);
 }
 
 void Counter::SetDownSource(std::shared_ptr<AnalogTrigger> analogTrigger,
                             AnalogTriggerType triggerType) {
-  if (StatusIsFatal()) return;
   SetDownSource(analogTrigger->CreateOutput(triggerType));
 }
 
 void Counter::SetDownSource(DigitalSource* source) {
-  SetDownSource(
-      std::shared_ptr<DigitalSource>(source, NullDeleter<DigitalSource>()));
+  SetDownSource(std::shared_ptr<DigitalSource>(
+      source, wpi::NullDeleter<DigitalSource>()));
 }
 
 void Counter::SetDownSource(DigitalSource& source) {
-  SetDownSource(
-      std::shared_ptr<DigitalSource>(&source, NullDeleter<DigitalSource>()));
+  SetDownSource(std::shared_ptr<DigitalSource>(
+      &source, wpi::NullDeleter<DigitalSource>()));
 }
 
 void Counter::SetDownSource(std::shared_ptr<DigitalSource> source) {
-  if (StatusIsFatal()) return;
   m_downSource = source;
-  if (m_downSource->StatusIsFatal()) {
-    CloneError(*m_downSource);
-  } else {
-    int32_t status = 0;
-    HAL_SetCounterDownSource(
-        m_counter, source->GetPortHandleForRouting(),
-        (HAL_AnalogTriggerType)source->GetAnalogTriggerTypeForRouting(),
-        &status);
-    wpi_setHALError(status);
-  }
+  int32_t status = 0;
+  HAL_SetCounterDownSource(m_counter, source->GetPortHandleForRouting(),
+                           static_cast<HAL_AnalogTriggerType>(
+                               source->GetAnalogTriggerTypeForRouting()),
+                           &status);
+  FRC_CheckErrorStatus(status, "{}", "SetDownSource");
 }
 
 void Counter::SetDownSourceEdge(bool risingEdge, bool fallingEdge) {
-  if (StatusIsFatal()) return;
   if (m_downSource == nullptr) {
-    wpi_setWPIErrorWithContext(
-        NullParameter,
+    throw FRC_MakeError(
+        err::NullParameter, "{}",
         "Must set non-nullptr DownSource before setting DownSourceEdge");
   }
   int32_t status = 0;
   HAL_SetCounterDownSourceEdge(m_counter, risingEdge, fallingEdge, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetDownSourceEdge");
 }
 
 void Counter::ClearDownSource() {
-  if (StatusIsFatal()) return;
   m_downSource.reset();
   int32_t status = 0;
   HAL_ClearCounterDownSource(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "ClearDownSource");
 }
 
 void Counter::SetUpDownCounterMode() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterUpDownMode(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetUpDownCounterMode");
 }
 
 void Counter::SetExternalDirectionMode() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterExternalDirectionMode(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetExternalDirectionMode");
 }
 
 void Counter::SetSemiPeriodMode(bool highSemiPeriod) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterSemiPeriodMode(m_counter, highSemiPeriod, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSemiPeriodMode to {}",
+                       highSemiPeriod ? "true" : "false");
 }
 
 void Counter::SetPulseLengthMode(double threshold) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterPulseLengthMode(m_counter, threshold, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetPulseLengthMode");
 }
 
 void Counter::SetReverseDirection(bool reverseDirection) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterReverseDirection(m_counter, reverseDirection, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetReverseDirection to {}",
+                       reverseDirection ? "true" : "false");
 }
 
 void Counter::SetSamplesToAverage(int samplesToAverage) {
   if (samplesToAverage < 1 || samplesToAverage > 127) {
-    wpi_setWPIErrorWithContext(
-        ParameterOutOfRange,
-        "Average counter values must be between 1 and 127");
+    throw FRC_MakeError(
+        err::ParameterOutOfRange,
+        "Average counter values must be between 1 and 127, {} out of range",
+        samplesToAverage);
   }
   int32_t status = 0;
   HAL_SetCounterSamplesToAverage(m_counter, samplesToAverage, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSamplesToAverage to {}", samplesToAverage);
 }
 
 int Counter::GetSamplesToAverage() const {
   int32_t status = 0;
   int samples = HAL_GetCounterSamplesToAverage(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetSamplesToAverage");
   return samples;
 }
 
-int Counter::GetFPGAIndex() const { return m_index; }
+int Counter::GetFPGAIndex() const {
+  return m_index;
+}
 
 int Counter::Get() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetCounter(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Get");
   return value;
 }
 
 void Counter::Reset() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_ResetCounter(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Reset");
 }
 
-double Counter::GetPeriod() const {
-  if (StatusIsFatal()) return 0.0;
+units::second_t Counter::GetPeriod() const {
   int32_t status = 0;
   double value = HAL_GetCounterPeriod(m_counter, &status);
-  wpi_setHALError(status);
-  return value;
+  FRC_CheckErrorStatus(status, "{}", "GetPeriod");
+  return units::second_t{value};
 }
 
-void Counter::SetMaxPeriod(double maxPeriod) {
-  if (StatusIsFatal()) return;
+void Counter::SetMaxPeriod(units::second_t maxPeriod) {
   int32_t status = 0;
-  HAL_SetCounterMaxPeriod(m_counter, maxPeriod, &status);
-  wpi_setHALError(status);
+  HAL_SetCounterMaxPeriod(m_counter, maxPeriod.value(), &status);
+  FRC_CheckErrorStatus(status, "{}", "SetMaxPeriod");
 }
 
 void Counter::SetUpdateWhenEmpty(bool enabled) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetCounterUpdateWhenEmpty(m_counter, enabled, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetUpdateWhenEmpty");
 }
 
 bool Counter::GetStopped() const {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool value = HAL_GetCounterStopped(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetStopped");
   return value;
 }
 
 bool Counter::GetDirection() const {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool value = HAL_GetCounterDirection(m_counter, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetDirection");
   return value;
 }
 
-void Counter::InitSendable(SendableBuilder& builder) {
+void Counter::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Counter");
   builder.AddDoubleProperty(
-      "Value", [=]() { return Get(); }, nullptr);
+      "Value", [=] { return Get(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/DMA.cpp b/wpilibc/src/main/native/cpp/DMA.cpp
index 1861555..80c0adb 100644
--- a/wpilibc/src/main/native/cpp/DMA.cpp
+++ b/wpilibc/src/main/native/cpp/DMA.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DMA.h"
 
@@ -12,104 +9,154 @@
 #include <frc/DigitalSource.h>
 #include <frc/DutyCycle.h>
 #include <frc/Encoder.h>
+#include <frc/PWM.h>
+#include <frc/motorcontrol/PWMMotorController.h>
 
 #include <hal/DMA.h>
 #include <hal/HALBase.h>
 
+#include "frc/AnalogInput.h"
+#include "frc/Counter.h"
+#include "frc/DigitalSource.h"
+#include "frc/DutyCycle.h"
+#include "frc/Encoder.h"
+#include "frc/Errors.h"
+
 using namespace frc;
 
 DMA::DMA() {
   int32_t status = 0;
   dmaHandle = HAL_InitializeDMA(&status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "InitializeDMA");
 }
 
-DMA::~DMA() { HAL_FreeDMA(dmaHandle); }
+DMA::~DMA() {
+  HAL_FreeDMA(dmaHandle);
+}
 
 void DMA::SetPause(bool pause) {
   int32_t status = 0;
   HAL_SetDMAPause(dmaHandle, pause, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "SetPause");
 }
 
-void DMA::SetRate(int cycles) {
+void DMA::SetTimedTrigger(units::second_t seconds) {
   int32_t status = 0;
-  HAL_SetDMARate(dmaHandle, cycles, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  HAL_SetDMATimedTrigger(dmaHandle, seconds.value(), &status);
+  FRC_CheckErrorStatus(status, "{}", "SetTimedTrigger");
+}
+
+void DMA::SetTimedTriggerCycles(int cycles) {
+  int32_t status = 0;
+  HAL_SetDMATimedTriggerCycles(dmaHandle, cycles, &status);
+  FRC_CheckErrorStatus(status, "{}", "SetTimedTriggerCycles");
 }
 
 void DMA::AddEncoder(const Encoder* encoder) {
   int32_t status = 0;
   HAL_AddDMAEncoder(dmaHandle, encoder->m_encoder, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddEncoder");
 }
 
 void DMA::AddEncoderPeriod(const Encoder* encoder) {
   int32_t status = 0;
   HAL_AddDMAEncoderPeriod(dmaHandle, encoder->m_encoder, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddEncoderPeriod");
 }
 
 void DMA::AddCounter(const Counter* counter) {
   int32_t status = 0;
   HAL_AddDMACounter(dmaHandle, counter->m_counter, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddCounter");
 }
 
 void DMA::AddCounterPeriod(const Counter* counter) {
   int32_t status = 0;
   HAL_AddDMACounterPeriod(dmaHandle, counter->m_counter, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddCounterPeriod");
 }
 
 void DMA::AddDigitalSource(const DigitalSource* digitalSource) {
   int32_t status = 0;
   HAL_AddDMADigitalSource(dmaHandle, digitalSource->GetPortHandleForRouting(),
                           &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddDigitalSource");
 }
 
 void DMA::AddDutyCycle(const DutyCycle* dutyCycle) {
   int32_t status = 0;
   HAL_AddDMADutyCycle(dmaHandle, dutyCycle->m_handle, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddDutyCycle");
 }
 
 void DMA::AddAnalogInput(const AnalogInput* analogInput) {
   int32_t status = 0;
   HAL_AddDMAAnalogInput(dmaHandle, analogInput->m_port, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddAnalogInput");
 }
 
 void DMA::AddAveragedAnalogInput(const AnalogInput* analogInput) {
   int32_t status = 0;
   HAL_AddDMAAveragedAnalogInput(dmaHandle, analogInput->m_port, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddAveragedAnalogInput");
 }
 
 void DMA::AddAnalogAccumulator(const AnalogInput* analogInput) {
   int32_t status = 0;
   HAL_AddDMAAnalogAccumulator(dmaHandle, analogInput->m_port, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "AddAnalogAccumulator");
 }
 
-void DMA::SetExternalTrigger(DigitalSource* source, bool rising, bool falling) {
+int DMA::SetExternalTrigger(DigitalSource* source, bool rising, bool falling) {
   int32_t status = 0;
-  HAL_SetDMAExternalTrigger(dmaHandle, source->GetPortHandleForRouting(),
-                            static_cast<HAL_AnalogTriggerType>(
-                                source->GetAnalogTriggerTypeForRouting()),
-                            rising, falling, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  int32_t idx =
+      HAL_SetDMAExternalTrigger(dmaHandle, source->GetPortHandleForRouting(),
+                                static_cast<HAL_AnalogTriggerType>(
+                                    source->GetAnalogTriggerTypeForRouting()),
+                                rising, falling, &status);
+  FRC_CheckErrorStatus(status, "{}", "SetExternalTrigger");
+  return idx;
 }
 
-void DMA::StartDMA(int queueDepth) {
+int DMA::SetPwmEdgeTrigger(PWMMotorController* source, bool rising,
+                           bool falling) {
+  int32_t status = 0;
+  int32_t idx = HAL_SetDMAExternalTrigger(
+      dmaHandle, source->GetPwm()->m_handle,
+      HAL_AnalogTriggerType::HAL_Trigger_kInWindow, rising, falling, &status);
+  FRC_CheckErrorStatus(status, "{}", "SetPWmEdgeTrigger");
+  return idx;
+}
+
+int DMA::SetPwmEdgeTrigger(PWM* source, bool rising, bool falling) {
+  int32_t status = 0;
+  int32_t idx = HAL_SetDMAExternalTrigger(
+      dmaHandle, source->m_handle, HAL_AnalogTriggerType::HAL_Trigger_kInWindow,
+      rising, falling, &status);
+  FRC_CheckErrorStatus(status, "{}", "SetPWmEdgeTrigger");
+  return idx;
+}
+
+void DMA::ClearSensors() {
+  int32_t status = 0;
+  HAL_ClearDMASensors(dmaHandle, &status);
+  FRC_CheckErrorStatus(status, "{}", "ClearSensors");
+}
+
+void DMA::ClearExternalTriggers() {
+  int32_t status = 0;
+  HAL_ClearDMAExternalTriggers(dmaHandle, &status);
+  FRC_CheckErrorStatus(status, "{}", "ClearExternalTriggers");
+}
+
+void DMA::Start(int queueDepth) {
   int32_t status = 0;
   HAL_StartDMA(dmaHandle, queueDepth, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "Start");
 }
 
-void DMA::StopDMA() {
+void DMA::Stop() {
   int32_t status = 0;
   HAL_StopDMA(dmaHandle, &status);
-  wpi_setErrorWithContext(status, HAL_GetErrorMessage(status));
+  FRC_CheckErrorStatus(status, "{}", "Stop");
 }
diff --git a/wpilibc/src/main/native/cpp/DMC60.cpp b/wpilibc/src/main/native/cpp/DMC60.cpp
deleted file mode 100644
index e7d2c65..0000000
--- a/wpilibc/src/main/native/cpp/DMC60.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/DMC60.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-DMC60::DMC60(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_DigilentDMC60, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "DMC60", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/DSControlWord.cpp b/wpilibc/src/main/native/cpp/DSControlWord.cpp
new file mode 100644
index 0000000..15d209a
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/DSControlWord.cpp
@@ -0,0 +1,55 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/DSControlWord.h"
+
+#include <hal/DriverStation.h>
+
+using namespace frc;
+
+DSControlWord::DSControlWord() {
+  HAL_GetControlWord(&m_controlWord);
+}
+
+bool DSControlWord::IsEnabled() const {
+  return m_controlWord.enabled && m_controlWord.dsAttached;
+}
+
+bool DSControlWord::IsDisabled() const {
+  return !(m_controlWord.enabled && m_controlWord.dsAttached);
+}
+
+bool DSControlWord::IsEStopped() const {
+  return m_controlWord.eStop;
+}
+
+bool DSControlWord::IsAutonomous() const {
+  return m_controlWord.autonomous;
+}
+
+bool DSControlWord::IsAutonomousEnabled() const {
+  return m_controlWord.autonomous && m_controlWord.enabled &&
+         m_controlWord.dsAttached;
+}
+
+bool DSControlWord::IsTeleop() const {
+  return !(m_controlWord.autonomous || m_controlWord.test);
+}
+
+bool DSControlWord::IsTeleopEnabled() const {
+  return !m_controlWord.autonomous && !m_controlWord.test &&
+         m_controlWord.enabled && m_controlWord.dsAttached;
+}
+
+bool DSControlWord::IsTest() const {
+  return m_controlWord.test;
+}
+
+bool DSControlWord::IsDSAttached() const {
+  return m_controlWord.dsAttached;
+}
+
+bool DSControlWord::IsFMSAttached() const {
+  return m_controlWord.fmsAttached;
+}
diff --git a/wpilibc/src/main/native/cpp/Debouncer.cpp b/wpilibc/src/main/native/cpp/Debouncer.cpp
new file mode 100644
index 0000000..eb402cd
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/Debouncer.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/Debouncer.h"
+
+using namespace frc;
+
+Debouncer::Debouncer(units::second_t debounceTime, DebounceType type)
+    : m_debounceTime(debounceTime), m_debounceType(type) {
+  switch (type) {
+    case DebounceType::kBoth:  // fall-through
+    case DebounceType::kRising:
+      m_baseline = false;
+      break;
+    case DebounceType::kFalling:
+      m_baseline = true;
+      break;
+  }
+  m_timer.Start();
+}
+
+bool Debouncer::Calculate(bool input) {
+  if (input == m_baseline) {
+    m_timer.Reset();
+  }
+
+  if (m_timer.HasElapsed(m_debounceTime)) {
+    if (m_debounceType == DebounceType::kBoth) {
+      m_baseline = input;
+      m_timer.Reset();
+    }
+    return input;
+  } else {
+    return m_baseline;
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/DigitalGlitchFilter.cpp b/wpilibc/src/main/native/cpp/DigitalGlitchFilter.cpp
index 3cec3f1..3294a99 100644
--- a/wpilibc/src/main/native/cpp/DigitalGlitchFilter.cpp
+++ b/wpilibc/src/main/native/cpp/DigitalGlitchFilter.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DigitalGlitchFilter.h"
 
@@ -14,13 +11,12 @@
 #include <hal/Constants.h>
 #include <hal/DIO.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 #include "frc/Counter.h"
 #include "frc/Encoder.h"
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
@@ -32,15 +28,14 @@
   std::scoped_lock lock(m_mutex);
   auto index =
       std::find(m_filterAllocated.begin(), m_filterAllocated.end(), false);
-  wpi_assert(index != m_filterAllocated.end());
+  FRC_Assert(index != m_filterAllocated.end());
 
   m_channelIndex = std::distance(m_filterAllocated.begin(), index);
   *index = true;
 
   HAL_Report(HALUsageReporting::kResourceType_DigitalGlitchFilter,
              m_channelIndex + 1);
-  SendableRegistry::GetInstance().AddLW(this, "DigitalGlitchFilter",
-                                        m_channelIndex);
+  wpi::SendableRegistry::AddLW(this, "DigitalGlitchFilter", m_channelIndex);
 }
 
 DigitalGlitchFilter::~DigitalGlitchFilter() {
@@ -50,20 +45,6 @@
   }
 }
 
-DigitalGlitchFilter::DigitalGlitchFilter(DigitalGlitchFilter&& rhs)
-    : ErrorBase(std::move(rhs)), SendableHelper(std::move(rhs)) {
-  std::swap(m_channelIndex, rhs.m_channelIndex);
-}
-
-DigitalGlitchFilter& DigitalGlitchFilter::operator=(DigitalGlitchFilter&& rhs) {
-  ErrorBase::operator=(std::move(rhs));
-  SendableHelper::operator=(std::move(rhs));
-
-  std::swap(m_channelIndex, rhs.m_channelIndex);
-
-  return *this;
-}
-
 void DigitalGlitchFilter::Add(DigitalSource* input) {
   DoAdd(input, m_channelIndex + 1);
 }
@@ -74,60 +55,50 @@
   if (input) {
     // We don't support GlitchFilters on AnalogTriggers.
     if (input->IsAnalogTrigger()) {
-      wpi_setErrorWithContext(
-          -1, "Analog Triggers not supported for DigitalGlitchFilters");
-      return;
+      throw FRC_MakeError(
+          -1, "{}", "Analog Triggers not supported for DigitalGlitchFilters");
     }
     int32_t status = 0;
     HAL_SetFilterSelect(input->GetPortHandleForRouting(), requestedIndex,
                         &status);
-    wpi_setHALError(status);
+    FRC_CheckErrorStatus(status, "requested index {}", requestedIndex);
 
     // Validate that we set it correctly.
     int actualIndex =
         HAL_GetFilterSelect(input->GetPortHandleForRouting(), &status);
-    wpi_assertEqual(actualIndex, requestedIndex);
+    FRC_CheckErrorStatus(status, "requested index {}", requestedIndex);
+    FRC_Assert(actualIndex == requestedIndex);
   }
 }
 
 void DigitalGlitchFilter::Add(Encoder* input) {
   Add(input->m_aSource.get());
-  if (StatusIsFatal()) {
-    return;
-  }
   Add(input->m_bSource.get());
 }
 
 void DigitalGlitchFilter::Add(Counter* input) {
   Add(input->m_upSource.get());
-  if (StatusIsFatal()) {
-    return;
-  }
   Add(input->m_downSource.get());
 }
 
-void DigitalGlitchFilter::Remove(DigitalSource* input) { DoAdd(input, 0); }
+void DigitalGlitchFilter::Remove(DigitalSource* input) {
+  DoAdd(input, 0);
+}
 
 void DigitalGlitchFilter::Remove(Encoder* input) {
   Remove(input->m_aSource.get());
-  if (StatusIsFatal()) {
-    return;
-  }
   Remove(input->m_bSource.get());
 }
 
 void DigitalGlitchFilter::Remove(Counter* input) {
   Remove(input->m_upSource.get());
-  if (StatusIsFatal()) {
-    return;
-  }
   Remove(input->m_downSource.get());
 }
 
 void DigitalGlitchFilter::SetPeriodCycles(int fpgaCycles) {
   int32_t status = 0;
   HAL_SetFilterPeriod(m_channelIndex, fpgaCycles, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channelIndex);
 }
 
 void DigitalGlitchFilter::SetPeriodNanoSeconds(uint64_t nanoseconds) {
@@ -135,27 +106,22 @@
   int fpgaCycles =
       nanoseconds * HAL_GetSystemClockTicksPerMicrosecond() / 4 / 1000;
   HAL_SetFilterPeriod(m_channelIndex, fpgaCycles, &status);
-
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channelIndex);
 }
 
 int DigitalGlitchFilter::GetPeriodCycles() {
   int32_t status = 0;
   int fpgaCycles = HAL_GetFilterPeriod(m_channelIndex, &status);
-
-  wpi_setHALError(status);
-
+  FRC_CheckErrorStatus(status, "Channel {}", m_channelIndex);
   return fpgaCycles;
 }
 
 uint64_t DigitalGlitchFilter::GetPeriodNanoSeconds() {
   int32_t status = 0;
   int fpgaCycles = HAL_GetFilterPeriod(m_channelIndex, &status);
-
-  wpi_setHALError(status);
-
+  FRC_CheckErrorStatus(status, "Channel {}", m_channelIndex);
   return static_cast<uint64_t>(fpgaCycles) * 1000L /
          static_cast<uint64_t>(HAL_GetSystemClockTicksPerMicrosecond() / 4);
 }
 
-void DigitalGlitchFilter::InitSendable(SendableBuilder&) {}
+void DigitalGlitchFilter::InitSendable(wpi::SendableBuilder&) {}
diff --git a/wpilibc/src/main/native/cpp/DigitalInput.cpp b/wpilibc/src/main/native/cpp/DigitalInput.cpp
index d82f570..7bce921 100644
--- a/wpilibc/src/main/native/cpp/DigitalInput.cpp
+++ b/wpilibc/src/main/native/cpp/DigitalInput.cpp
@@ -1,77 +1,74 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DigitalInput.h"
 
+#include <iostream>
 #include <limits>
 
 #include <hal/DIO.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 DigitalInput::DigitalInput(int channel) {
   if (!SensorUtil::CheckDigitalChannel(channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "Digital Channel " + wpi::Twine(channel));
-    m_channel = std::numeric_limits<int>::max();
-    return;
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", channel);
   }
   m_channel = channel;
 
   int32_t status = 0;
-  m_handle = HAL_InitializeDIOPort(HAL_GetPort(channel), true, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumDigitalChannels(), channel);
-    m_handle = HAL_kInvalidHandle;
-    m_channel = std::numeric_limits<int>::max();
-    return;
-  }
+  std::string stackTrace = wpi::GetStackTrace(1);
+  m_handle = HAL_InitializeDIOPort(HAL_GetPort(channel), true,
+                                   stackTrace.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   HAL_Report(HALUsageReporting::kResourceType_DigitalInput, channel + 1);
-  SendableRegistry::GetInstance().AddLW(this, "DigitalInput", channel);
+  wpi::SendableRegistry::AddLW(this, "DigitalInput", channel);
 }
 
 DigitalInput::~DigitalInput() {
-  if (StatusIsFatal()) return;
   HAL_FreeDIOPort(m_handle);
 }
 
 bool DigitalInput::Get() const {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool value = HAL_GetDIO(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return value;
 }
 
-HAL_Handle DigitalInput::GetPortHandleForRouting() const { return m_handle; }
-
-AnalogTriggerType DigitalInput::GetAnalogTriggerTypeForRouting() const {
-  return (AnalogTriggerType)0;
+HAL_Handle DigitalInput::GetPortHandleForRouting() const {
+  return m_handle;
 }
 
-bool DigitalInput::IsAnalogTrigger() const { return false; }
+AnalogTriggerType DigitalInput::GetAnalogTriggerTypeForRouting() const {
+  return static_cast<AnalogTriggerType>(0);
+}
+
+bool DigitalInput::IsAnalogTrigger() const {
+  return false;
+}
 
 void DigitalInput::SetSimDevice(HAL_SimDeviceHandle device) {
   HAL_SetDIOSimDevice(m_handle, device);
 }
 
-int DigitalInput::GetChannel() const { return m_channel; }
+int DigitalInput::GetChannel() const {
+  return m_channel;
+}
 
-void DigitalInput::InitSendable(SendableBuilder& builder) {
+void DigitalInput::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Digital Input");
   builder.AddBooleanProperty(
-      "Value", [=]() { return Get(); }, nullptr);
+      "Value", [=] { return Get(); }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/DigitalOutput.cpp b/wpilibc/src/main/native/cpp/DigitalOutput.cpp
index 0bdc57c..5810e30 100644
--- a/wpilibc/src/main/native/cpp/DigitalOutput.cpp
+++ b/wpilibc/src/main/native/cpp/DigitalOutput.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DigitalOutput.h"
 
@@ -13,146 +10,138 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 DigitalOutput::DigitalOutput(int channel) {
   m_pwmGenerator = HAL_kInvalidHandle;
   if (!SensorUtil::CheckDigitalChannel(channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "Digital Channel " + wpi::Twine(channel));
-    m_channel = std::numeric_limits<int>::max();
-    return;
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", channel);
   }
   m_channel = channel;
 
   int32_t status = 0;
-  m_handle = HAL_InitializeDIOPort(HAL_GetPort(channel), false, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumDigitalChannels(), channel);
-    m_channel = std::numeric_limits<int>::max();
-    m_handle = HAL_kInvalidHandle;
-    return;
-  }
+  std::string stackTrace = wpi::GetStackTrace(1);
+  m_handle = HAL_InitializeDIOPort(HAL_GetPort(channel), false,
+                                   stackTrace.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   HAL_Report(HALUsageReporting::kResourceType_DigitalOutput, channel + 1);
-  SendableRegistry::GetInstance().AddLW(this, "DigitalOutput", channel);
+  wpi::SendableRegistry::AddLW(this, "DigitalOutput", channel);
 }
 
 DigitalOutput::~DigitalOutput() {
-  if (StatusIsFatal()) return;
   // Disable the PWM in case it was running.
-  DisablePWM();
+  try {
+    DisablePWM();
+  } catch (const RuntimeError& e) {
+    e.Report();
+  }
 
   HAL_FreeDIOPort(m_handle);
 }
 
 void DigitalOutput::Set(bool value) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
   HAL_SetDIO(m_handle, value, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 bool DigitalOutput::Get() const {
-  if (StatusIsFatal()) return false;
-
   int32_t status = 0;
   bool val = HAL_GetDIO(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return val;
 }
 
-HAL_Handle DigitalOutput::GetPortHandleForRouting() const { return m_handle; }
-
-AnalogTriggerType DigitalOutput::GetAnalogTriggerTypeForRouting() const {
-  return (AnalogTriggerType)0;
+HAL_Handle DigitalOutput::GetPortHandleForRouting() const {
+  return m_handle;
 }
 
-bool DigitalOutput::IsAnalogTrigger() const { return false; }
+AnalogTriggerType DigitalOutput::GetAnalogTriggerTypeForRouting() const {
+  return static_cast<AnalogTriggerType>(0);
+}
 
-int DigitalOutput::GetChannel() const { return m_channel; }
+bool DigitalOutput::IsAnalogTrigger() const {
+  return false;
+}
+
+int DigitalOutput::GetChannel() const {
+  return m_channel;
+}
 
 void DigitalOutput::Pulse(double length) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
   HAL_Pulse(m_handle, length, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 bool DigitalOutput::IsPulsing() const {
-  if (StatusIsFatal()) return false;
-
   int32_t status = 0;
   bool value = HAL_IsPulsing(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return value;
 }
 
 void DigitalOutput::SetPWMRate(double rate) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
   HAL_SetDigitalPWMRate(rate, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void DigitalOutput::EnablePWM(double initialDutyCycle) {
-  if (m_pwmGenerator != HAL_kInvalidHandle) return;
+  if (m_pwmGenerator != HAL_kInvalidHandle) {
+    return;
+  }
 
   int32_t status = 0;
 
-  if (StatusIsFatal()) return;
   m_pwmGenerator = HAL_AllocateDigitalPWM(&status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
-  if (StatusIsFatal()) return;
   HAL_SetDigitalPWMDutyCycle(m_pwmGenerator, initialDutyCycle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
-  if (StatusIsFatal()) return;
   HAL_SetDigitalPWMOutputChannel(m_pwmGenerator, m_channel, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void DigitalOutput::DisablePWM() {
-  if (StatusIsFatal()) return;
-  if (m_pwmGenerator == HAL_kInvalidHandle) return;
+  if (m_pwmGenerator == HAL_kInvalidHandle) {
+    return;
+  }
 
   int32_t status = 0;
 
   // Disable the output by routing to a dead bit.
   HAL_SetDigitalPWMOutputChannel(m_pwmGenerator, SensorUtil::kDigitalChannels,
                                  &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
   HAL_FreeDigitalPWM(m_pwmGenerator, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
   m_pwmGenerator = HAL_kInvalidHandle;
 }
 
 void DigitalOutput::UpdateDutyCycle(double dutyCycle) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
   HAL_SetDigitalPWMDutyCycle(m_pwmGenerator, dutyCycle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void DigitalOutput::SetSimDevice(HAL_SimDeviceHandle device) {
   HAL_SetDIOSimDevice(m_handle, device);
 }
 
-void DigitalOutput::InitSendable(SendableBuilder& builder) {
+void DigitalOutput::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Digital Output");
   builder.AddBooleanProperty(
-      "Value", [=]() { return Get(); }, [=](bool value) { Set(value); });
+      "Value", [=] { return Get(); }, [=](bool value) { Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/DoubleSolenoid.cpp b/wpilibc/src/main/native/cpp/DoubleSolenoid.cpp
index 67eb0b7..212673a 100644
--- a/wpilibc/src/main/native/cpp/DoubleSolenoid.cpp
+++ b/wpilibc/src/main/native/cpp/DoubleSolenoid.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DoubleSolenoid.h"
 
@@ -12,128 +9,92 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
-#include <hal/Solenoid.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
-DoubleSolenoid::DoubleSolenoid(int forwardChannel, int reverseChannel)
-    : DoubleSolenoid(SensorUtil::GetDefaultSolenoidModule(), forwardChannel,
-                     reverseChannel) {}
-
-DoubleSolenoid::DoubleSolenoid(int moduleNumber, int forwardChannel,
-                               int reverseChannel)
-    : SolenoidBase(moduleNumber),
-      m_forwardChannel(forwardChannel),
-      m_reverseChannel(reverseChannel) {
-  if (!SensorUtil::CheckSolenoidModule(m_moduleNumber)) {
-    wpi_setWPIErrorWithContext(ModuleIndexOutOfRange,
-                               "Solenoid Module " + wpi::Twine(m_moduleNumber));
-    return;
+DoubleSolenoid::DoubleSolenoid(int module, PneumaticsModuleType moduleType,
+                               int forwardChannel, int reverseChannel)
+    : m_module{PneumaticsBase::GetForType(module, moduleType)},
+      m_forwardChannel{forwardChannel},
+      m_reverseChannel{reverseChannel} {
+  if (!m_module->CheckSolenoidChannel(m_forwardChannel)) {
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}",
+                        m_forwardChannel);
   }
-  if (!SensorUtil::CheckSolenoidChannel(m_forwardChannel)) {
-    wpi_setWPIErrorWithContext(
-        ChannelIndexOutOfRange,
-        "Solenoid Channel " + wpi::Twine(m_forwardChannel));
-    return;
-  }
-  if (!SensorUtil::CheckSolenoidChannel(m_reverseChannel)) {
-    wpi_setWPIErrorWithContext(
-        ChannelIndexOutOfRange,
-        "Solenoid Channel " + wpi::Twine(m_reverseChannel));
-    return;
-  }
-  int32_t status = 0;
-  m_forwardHandle = HAL_InitializeSolenoidPort(
-      HAL_GetPortWithModule(moduleNumber, m_forwardChannel), &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumSolenoidChannels(),
-                             forwardChannel);
-    m_forwardHandle = HAL_kInvalidHandle;
-    m_reverseHandle = HAL_kInvalidHandle;
-    return;
+  if (!m_module->CheckSolenoidChannel(m_reverseChannel)) {
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}",
+                        m_reverseChannel);
   }
 
-  m_reverseHandle = HAL_InitializeSolenoidPort(
-      HAL_GetPortWithModule(moduleNumber, m_reverseChannel), &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumSolenoidChannels(),
-                             reverseChannel);
-    // free forward solenoid
-    HAL_FreeSolenoidPort(m_forwardHandle);
-    m_forwardHandle = HAL_kInvalidHandle;
-    m_reverseHandle = HAL_kInvalidHandle;
-    return;
-  }
+  m_forwardMask = 1 << forwardChannel;
+  m_reverseMask = 1 << reverseChannel;
+  m_mask = m_forwardMask | m_reverseMask;
 
-  m_forwardMask = 1 << m_forwardChannel;
-  m_reverseMask = 1 << m_reverseChannel;
+  int allocMask = m_module->CheckAndReserveSolenoids(m_mask);
+  if (allocMask != 0) {
+    if (allocMask == m_mask) {
+      throw FRC_MakeError(err::ResourceAlreadyAllocated, "Channels {} and {}",
+                          m_forwardChannel, m_reverseChannel);
+    } else if (allocMask == m_forwardMask) {
+      throw FRC_MakeError(err::ResourceAlreadyAllocated, "Channel {}",
+                          m_forwardChannel);
+    } else {
+      throw FRC_MakeError(err::ResourceAlreadyAllocated, "Channel {}",
+                          m_reverseChannel);
+    }
+  }
 
   HAL_Report(HALUsageReporting::kResourceType_Solenoid, m_forwardChannel + 1,
-             m_moduleNumber + 1);
+             m_module->GetModuleNumber() + 1);
   HAL_Report(HALUsageReporting::kResourceType_Solenoid, m_reverseChannel + 1,
-             m_moduleNumber + 1);
+             m_module->GetModuleNumber() + 1);
 
-  SendableRegistry::GetInstance().AddLW(this, "DoubleSolenoid", m_moduleNumber,
-                                        m_forwardChannel);
+  wpi::SendableRegistry::AddLW(this, "DoubleSolenoid",
+                               m_module->GetModuleNumber(), m_forwardChannel);
 }
 
+DoubleSolenoid::DoubleSolenoid(PneumaticsModuleType moduleType,
+                               int forwardChannel, int reverseChannel)
+    : DoubleSolenoid{PneumaticsBase::GetDefaultForType(moduleType), moduleType,
+                     forwardChannel, reverseChannel} {}
+
 DoubleSolenoid::~DoubleSolenoid() {
-  HAL_FreeSolenoidPort(m_forwardHandle);
-  HAL_FreeSolenoidPort(m_reverseHandle);
+  m_module->UnreserveSolenoids(m_mask);
 }
 
 void DoubleSolenoid::Set(Value value) {
-  if (StatusIsFatal()) return;
-
-  bool forward = false;
-  bool reverse = false;
+  int setValue = 0;
 
   switch (value) {
     case kOff:
-      forward = false;
-      reverse = false;
+      setValue = 0;
       break;
     case kForward:
-      forward = true;
-      reverse = false;
+      setValue = m_forwardMask;
       break;
     case kReverse:
-      forward = false;
-      reverse = true;
+      setValue = m_reverseMask;
       break;
   }
 
-  int fstatus = 0;
-  HAL_SetSolenoid(m_forwardHandle, forward, &fstatus);
-  int rstatus = 0;
-  HAL_SetSolenoid(m_reverseHandle, reverse, &rstatus);
-
-  wpi_setHALError(fstatus);
-  wpi_setHALError(rstatus);
+  m_module->SetSolenoids(m_mask, setValue);
 }
 
 DoubleSolenoid::Value DoubleSolenoid::Get() const {
-  if (StatusIsFatal()) return kOff;
+  auto values = m_module->GetSolenoids();
 
-  int fstatus = 0;
-  int rstatus = 0;
-  bool valueForward = HAL_GetSolenoid(m_forwardHandle, &fstatus);
-  bool valueReverse = HAL_GetSolenoid(m_reverseHandle, &rstatus);
-
-  wpi_setHALError(fstatus);
-  wpi_setHALError(rstatus);
-
-  if (valueForward) {
-    return kForward;
-  } else if (valueReverse) {
-    return kReverse;
+  if ((values & m_forwardMask) != 0) {
+    return Value::kForward;
+  } else if ((values & m_reverseMask) != 0) {
+    return Value::kReverse;
   } else {
-    return kOff;
+    return Value::kOff;
   }
 }
 
@@ -147,23 +108,29 @@
   }
 }
 
-bool DoubleSolenoid::IsFwdSolenoidBlackListed() const {
-  int blackList = GetPCMSolenoidBlackList(m_moduleNumber);
-  return (blackList & m_forwardMask) != 0;
+int DoubleSolenoid::GetFwdChannel() const {
+  return m_forwardChannel;
 }
 
-bool DoubleSolenoid::IsRevSolenoidBlackListed() const {
-  int blackList = GetPCMSolenoidBlackList(m_moduleNumber);
-  return (blackList & m_reverseMask) != 0;
+int DoubleSolenoid::GetRevChannel() const {
+  return m_reverseChannel;
 }
 
-void DoubleSolenoid::InitSendable(SendableBuilder& builder) {
+bool DoubleSolenoid::IsFwdSolenoidDisabled() const {
+  return (m_module->GetSolenoidDisabledList() & m_forwardMask) != 0;
+}
+
+bool DoubleSolenoid::IsRevSolenoidDisabled() const {
+  return (m_module->GetSolenoidDisabledList() & m_reverseMask) != 0;
+}
+
+void DoubleSolenoid::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Double Solenoid");
   builder.SetActuator(true);
-  builder.SetSafeState([=]() { Set(kOff); });
+  builder.SetSafeState([=] { Set(kOff); });
   builder.AddSmallStringProperty(
       "Value",
-      [=](wpi::SmallVectorImpl<char>& buf) -> wpi::StringRef {
+      [=](wpi::SmallVectorImpl<char>& buf) -> std::string_view {
         switch (Get()) {
           case kForward:
             return "Forward";
@@ -173,12 +140,13 @@
             return "Off";
         }
       },
-      [=](wpi::StringRef value) {
+      [=](std::string_view value) {
         Value lvalue = kOff;
-        if (value == "Forward")
+        if (value == "Forward") {
           lvalue = kForward;
-        else if (value == "Reverse")
+        } else if (value == "Reverse") {
           lvalue = kReverse;
+        }
         Set(lvalue);
       });
 }
diff --git a/wpilibc/src/main/native/cpp/DriverStation.cpp b/wpilibc/src/main/native/cpp/DriverStation.cpp
index dbb99f9..37fc65f 100644
--- a/wpilibc/src/main/native/cpp/DriverStation.cpp
+++ b/wpilibc/src/main/native/cpp/DriverStation.cpp
@@ -1,69 +1,163 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DriverStation.h"
 
-#include <chrono>
+#include <stdint.h>
 
+#include <array>
+#include <atomic>
+#include <chrono>
+#include <string>
+#include <string_view>
+#include <thread>
+#include <type_traits>
+
+#include <fmt/format.h>
 #include <hal/DriverStation.h>
+#include <hal/DriverStationTypes.h>
 #include <hal/HALBase.h>
 #include <hal/Power.h>
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableInstance.h>
-#include <wpi/SmallString.h>
-#include <wpi/StringRef.h>
+#include <wpi/condition_variable.h>
+#include <wpi/mutex.h>
 
+#include "frc/Errors.h"
 #include "frc/MotorSafety.h"
 #include "frc/Timer.h"
-#include "frc/WPIErrors.h"
-
-namespace frc {
-
-class MatchDataSender {
- public:
-  std::shared_ptr<nt::NetworkTable> table;
-  nt::NetworkTableEntry typeMetadata;
-  nt::NetworkTableEntry gameSpecificMessage;
-  nt::NetworkTableEntry eventName;
-  nt::NetworkTableEntry matchNumber;
-  nt::NetworkTableEntry replayNumber;
-  nt::NetworkTableEntry matchType;
-  nt::NetworkTableEntry alliance;
-  nt::NetworkTableEntry station;
-  nt::NetworkTableEntry controlWord;
-
-  MatchDataSender() {
-    table = nt::NetworkTableInstance::GetDefault().GetTable("FMSInfo");
-    typeMetadata = table->GetEntry(".type");
-    typeMetadata.ForceSetString("FMSInfo");
-    gameSpecificMessage = table->GetEntry("GameSpecificMessage");
-    gameSpecificMessage.ForceSetString("");
-    eventName = table->GetEntry("EventName");
-    eventName.ForceSetString("");
-    matchNumber = table->GetEntry("MatchNumber");
-    matchNumber.ForceSetDouble(0);
-    replayNumber = table->GetEntry("ReplayNumber");
-    replayNumber.ForceSetDouble(0);
-    matchType = table->GetEntry("MatchType");
-    matchType.ForceSetDouble(0);
-    alliance = table->GetEntry("IsRedAlliance");
-    alliance.ForceSetBoolean(true);
-    station = table->GetEntry("StationNumber");
-    station.ForceSetDouble(1);
-    controlWord = table->GetEntry("FMSControlData");
-    controlWord.ForceSetDouble(0);
-  }
-};
-}  // namespace frc
 
 using namespace frc;
 
-static constexpr double kJoystickUnpluggedMessageInterval = 1.0;
+namespace {
+// A simple class which caches the previous value written to an NT entry
+// Used to prevent redundant, repeated writes of the same value
+template <class T>
+class MatchDataSenderEntry {
+ public:
+  MatchDataSenderEntry(const std::shared_ptr<nt::NetworkTable>& table,
+                       std::string_view key, const T& initialVal) {
+    static_assert(std::is_same_v<T, bool> || std::is_same_v<T, double> ||
+                      std::is_same_v<T, std::string>,
+                  "Invalid type for MatchDataSenderEntry - must be "
+                  "to bool, double or std::string");
+
+    ntEntry = table->GetEntry(key);
+    if constexpr (std::is_same_v<T, bool>) {
+      ntEntry.ForceSetBoolean(initialVal);
+    } else if constexpr (std::is_same_v<T, double>) {
+      ntEntry.ForceSetDouble(initialVal);
+    } else if constexpr (std::is_same_v<T, std::string>) {
+      ntEntry.ForceSetString(initialVal);
+    }
+    prevVal = initialVal;
+  }
+
+  void Set(const T& val) {
+    if (val != prevVal) {
+      SetValue(val);
+      prevVal = val;
+    }
+  }
+
+ private:
+  nt::NetworkTableEntry ntEntry;
+  T prevVal;
+
+  void SetValue(bool val) { ntEntry.SetBoolean(val); }
+  void SetValue(double val) { ntEntry.SetDouble(val); }
+  void SetValue(std::string_view val) { ntEntry.SetString(val); }
+};
+
+struct MatchDataSender {
+  std::shared_ptr<nt::NetworkTable> table =
+      nt::NetworkTableInstance::GetDefault().GetTable("FMSInfo");
+  MatchDataSenderEntry<std::string> typeMetaData{table, ".type", "FMSInfo"};
+  MatchDataSenderEntry<std::string> gameSpecificMessage{
+      table, "GameSpecificMessage", ""};
+  MatchDataSenderEntry<std::string> eventName{table, "EventName", ""};
+  MatchDataSenderEntry<double> matchNumber{table, "MatchNumber", 0.0};
+  MatchDataSenderEntry<double> replayNumber{table, "ReplayNumber", 0.0};
+  MatchDataSenderEntry<double> matchType{table, "MatchType", 0.0};
+  MatchDataSenderEntry<bool> alliance{table, "IsRedAlliance", true};
+  MatchDataSenderEntry<double> station{table, "StationNumber", 1.0};
+  MatchDataSenderEntry<double> controlWord{table, "FMSControlData", 0.0};
+};
+
+struct Instance {
+  Instance();
+  ~Instance();
+
+  MatchDataSender matchDataSender;
+
+  // Joystick button rising/falling edge flags
+  wpi::mutex buttonEdgeMutex;
+  std::array<HAL_JoystickButtons, DriverStation::kJoystickPorts>
+      previousButtonStates;
+  std::array<uint32_t, DriverStation::kJoystickPorts> joystickButtonsPressed;
+  std::array<uint32_t, DriverStation::kJoystickPorts> joystickButtonsReleased;
+
+  // Internal Driver Station thread
+  std::thread dsThread;
+  std::atomic<bool> isRunning{false};
+
+  mutable wpi::mutex waitForDataMutex;
+  wpi::condition_variable waitForDataCond;
+  int waitForDataCounter = 0;
+
+  bool silenceJoystickWarning = false;
+
+  // Robot state status variables
+  bool userInDisabled = false;
+  bool userInAutonomous = false;
+  bool userInTeleop = false;
+  bool userInTest = false;
+
+  units::second_t nextMessageTime = 0_s;
+};
+}  // namespace
+
+static constexpr auto kJoystickUnpluggedMessageInterval = 1_s;
+
+static Instance& GetInstance() {
+  static Instance instance;
+  return instance;
+}
+
+static void Run();
+static void SendMatchData();
+
+/**
+ * Reports errors related to unplugged joysticks.
+ *
+ * Throttles the errors so that they don't overwhelm the DS.
+ */
+static void ReportJoystickUnpluggedErrorV(fmt::string_view format,
+                                          fmt::format_args args);
+
+template <typename S, typename... Args>
+static inline void ReportJoystickUnpluggedError(const S& format,
+                                                Args&&... args) {
+  ReportJoystickUnpluggedErrorV(
+      format, fmt::make_args_checked<Args...>(format, args...));
+}
+
+/**
+ * Reports errors related to unplugged joysticks.
+ *
+ * Throttles the errors so that they don't overwhelm the DS.
+ */
+static void ReportJoystickUnpluggedWarningV(fmt::string_view format,
+                                            fmt::format_args args);
+
+template <typename S, typename... Args>
+static inline void ReportJoystickUnpluggedWarning(const S& format,
+                                                  Args&&... args) {
+  ReportJoystickUnpluggedWarningV(
+      format, fmt::make_args_checked<Args...>(format, args...));
+}
 
 static int& GetDSLastCount() {
   // There is a rollover error condition here. At Packet# = n * (uintmax), this
@@ -74,51 +168,42 @@
   return lastCount;
 }
 
-DriverStation::~DriverStation() {
-  m_isRunning = false;
+Instance::Instance() {
+  HAL_Initialize(500, 0);
+
+  // All joysticks should default to having zero axes, povs and buttons, so
+  // uninitialized memory doesn't get sent to motor controllers.
+  for (unsigned int i = 0; i < DriverStation::kJoystickPorts; i++) {
+    joystickButtonsPressed[i] = 0;
+    joystickButtonsReleased[i] = 0;
+    previousButtonStates[i].count = 0;
+    previousButtonStates[i].buttons = 0;
+  }
+
+  dsThread = std::thread(&Run);
+}
+
+Instance::~Instance() {
+  isRunning = false;
   // Trigger a DS mutex release in case there is no driver station running.
   HAL_ReleaseDSMutex();
-  m_dsThread.join();
+  dsThread.join();
 }
 
 DriverStation& DriverStation::GetInstance() {
+  ::GetInstance();
   static DriverStation instance;
   return instance;
 }
 
-void DriverStation::ReportError(const wpi::Twine& error) {
-  wpi::SmallString<128> temp;
-  HAL_SendError(1, 1, 0, error.toNullTerminatedStringRef(temp).data(), "", "",
-                1);
-}
-
-void DriverStation::ReportWarning(const wpi::Twine& error) {
-  wpi::SmallString<128> temp;
-  HAL_SendError(0, 1, 0, error.toNullTerminatedStringRef(temp).data(), "", "",
-                1);
-}
-
-void DriverStation::ReportError(bool isError, int32_t code,
-                                const wpi::Twine& error,
-                                const wpi::Twine& location,
-                                const wpi::Twine& stack) {
-  wpi::SmallString<128> errorTemp;
-  wpi::SmallString<128> locationTemp;
-  wpi::SmallString<128> stackTemp;
-  HAL_SendError(isError, code, 0,
-                error.toNullTerminatedStringRef(errorTemp).data(),
-                location.toNullTerminatedStringRef(locationTemp).data(),
-                stack.toNullTerminatedStringRef(stackTemp).data(), 1);
-}
-
 bool DriverStation::GetStickButton(int stick, int button) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return false;
   }
   if (button <= 0) {
     ReportJoystickUnpluggedError(
-        "ERROR: Button indexes begin at 1 in WPILib for C++ and Java");
+        "Joystick Button {} index out of range; indexes begin at 1", button);
     return false;
   }
 
@@ -127,7 +212,9 @@
 
   if (button > buttons.count) {
     ReportJoystickUnpluggedWarning(
-        "Joystick Button missing, check if all controllers are plugged in");
+        "Joystick Button {} missing (max {}), check if all controllers are "
+        "plugged in",
+        button, buttons.count);
     return false;
   }
 
@@ -136,12 +223,12 @@
 
 bool DriverStation::GetStickButtonPressed(int stick, int button) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return false;
   }
   if (button <= 0) {
     ReportJoystickUnpluggedError(
-        "ERROR: Button indexes begin at 1 in WPILib for C++ and Java");
+        "Joystick Button {} index out of range; indexes begin at 1", button);
     return false;
   }
 
@@ -150,27 +237,29 @@
 
   if (button > buttons.count) {
     ReportJoystickUnpluggedWarning(
-        "Joystick Button missing, check if all controllers are plugged in");
+        "Joystick Button {} missing (max {}), check if all controllers are "
+        "plugged in",
+        button, buttons.count);
     return false;
   }
-  std::unique_lock lock(m_buttonEdgeMutex);
+  auto& inst = ::GetInstance();
+  std::unique_lock lock(inst.buttonEdgeMutex);
   // If button was pressed, clear flag and return true
-  if (m_joystickButtonsPressed[stick] & 1 << (button - 1)) {
-    m_joystickButtonsPressed[stick] &= ~(1 << (button - 1));
+  if (inst.joystickButtonsPressed[stick] & 1 << (button - 1)) {
+    inst.joystickButtonsPressed[stick] &= ~(1 << (button - 1));
     return true;
-  } else {
-    return false;
   }
+  return false;
 }
 
 bool DriverStation::GetStickButtonReleased(int stick, int button) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return false;
   }
   if (button <= 0) {
     ReportJoystickUnpluggedError(
-        "ERROR: Button indexes begin at 1 in WPILib for C++ and Java");
+        "Joystick Button {} index out of range; indexes begin at 1", button);
     return false;
   }
 
@@ -179,26 +268,28 @@
 
   if (button > buttons.count) {
     ReportJoystickUnpluggedWarning(
-        "Joystick Button missing, check if all controllers are plugged in");
+        "Joystick Button {} missing (max {}), check if all controllers are "
+        "plugged in",
+        button, buttons.count);
     return false;
   }
-  std::unique_lock lock(m_buttonEdgeMutex);
+  auto& inst = ::GetInstance();
+  std::unique_lock lock(inst.buttonEdgeMutex);
   // If button was released, clear flag and return true
-  if (m_joystickButtonsReleased[stick] & 1 << (button - 1)) {
-    m_joystickButtonsReleased[stick] &= ~(1 << (button - 1));
+  if (inst.joystickButtonsReleased[stick] & 1 << (button - 1)) {
+    inst.joystickButtonsReleased[stick] &= ~(1 << (button - 1));
     return true;
-  } else {
-    return false;
   }
+  return false;
 }
 
 double DriverStation::GetStickAxis(int stick, int axis) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return 0.0;
   }
   if (axis < 0 || axis >= HAL_kMaxJoystickAxes) {
-    wpi_setWPIError(BadJoystickAxis);
+    FRC_ReportError(warn::BadJoystickAxis, "axis {} out of range", axis);
     return 0.0;
   }
 
@@ -207,7 +298,9 @@
 
   if (axis >= axes.count) {
     ReportJoystickUnpluggedWarning(
-        "Joystick Axis missing, check if all controllers are plugged in");
+        "Joystick Axis {} missing (max {}), check if all controllers are "
+        "plugged in",
+        axis, axes.count);
     return 0.0;
   }
 
@@ -216,11 +309,11 @@
 
 int DriverStation::GetStickPOV(int stick, int pov) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return -1;
   }
   if (pov < 0 || pov >= HAL_kMaxJoystickPOVs) {
-    wpi_setWPIError(BadJoystickAxis);
+    FRC_ReportError(warn::BadJoystickAxis, "POV {} out of range", pov);
     return -1;
   }
 
@@ -229,16 +322,18 @@
 
   if (pov >= povs.count) {
     ReportJoystickUnpluggedWarning(
-        "Joystick POV missing, check if all controllers are plugged in");
+        "Joystick POV {} missing (max {}), check if all controllers are "
+        "plugged in",
+        pov, povs.count);
     return -1;
   }
 
   return povs.povs[pov];
 }
 
-int DriverStation::GetStickButtons(int stick) const {
+int DriverStation::GetStickButtons(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return 0;
   }
 
@@ -248,9 +343,9 @@
   return buttons.buttons;
 }
 
-int DriverStation::GetStickAxisCount(int stick) const {
+int DriverStation::GetStickAxisCount(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return 0;
   }
 
@@ -260,9 +355,9 @@
   return axes.count;
 }
 
-int DriverStation::GetStickPOVCount(int stick) const {
+int DriverStation::GetStickPOVCount(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return 0;
   }
 
@@ -272,9 +367,9 @@
   return povs.count;
 }
 
-int DriverStation::GetStickButtonCount(int stick) const {
+int DriverStation::GetStickButtonCount(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return 0;
   }
 
@@ -284,9 +379,9 @@
   return buttons.count;
 }
 
-bool DriverStation::GetJoystickIsXbox(int stick) const {
+bool DriverStation::GetJoystickIsXbox(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return false;
   }
 
@@ -296,9 +391,9 @@
   return static_cast<bool>(descriptor.isXbox);
 }
 
-int DriverStation::GetJoystickType(int stick) const {
+int DriverStation::GetJoystickType(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return -1;
   }
 
@@ -308,9 +403,9 @@
   return static_cast<int>(descriptor.type);
 }
 
-std::string DriverStation::GetJoystickName(int stick) const {
+std::string DriverStation::GetJoystickName(int stick) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
   }
 
   HAL_JoystickDescriptor descriptor;
@@ -319,9 +414,9 @@
   return descriptor.name;
 }
 
-int DriverStation::GetJoystickAxisType(int stick, int axis) const {
+int DriverStation::GetJoystickAxisType(int stick, int axis) {
   if (stick < 0 || stick >= kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+    FRC_ReportError(warn::BadJoystickIndex, "stick {} out of range", stick);
     return -1;
   }
 
@@ -331,112 +426,123 @@
   return static_cast<bool>(descriptor.axisTypes);
 }
 
-bool DriverStation::IsJoystickConnected(int stick) const {
+bool DriverStation::IsJoystickConnected(int stick) {
   return GetStickAxisCount(stick) > 0 || GetStickButtonCount(stick) > 0 ||
          GetStickPOVCount(stick) > 0;
 }
 
-bool DriverStation::IsEnabled() const {
+bool DriverStation::IsEnabled() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.enabled && controlWord.dsAttached;
 }
 
-bool DriverStation::IsDisabled() const {
+bool DriverStation::IsDisabled() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return !(controlWord.enabled && controlWord.dsAttached);
 }
 
-bool DriverStation::IsEStopped() const {
+bool DriverStation::IsEStopped() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.eStop;
 }
 
-bool DriverStation::IsAutonomous() const {
+bool DriverStation::IsAutonomous() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.autonomous;
 }
 
-bool DriverStation::IsAutonomousEnabled() const {
+bool DriverStation::IsAutonomousEnabled() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.autonomous && controlWord.enabled;
 }
 
-bool DriverStation::IsOperatorControl() const {
+bool DriverStation::IsOperatorControl() {
+  return IsTeleop();
+}
+
+bool DriverStation::IsTeleop() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return !(controlWord.autonomous || controlWord.test);
 }
 
-bool DriverStation::IsOperatorControlEnabled() const {
+bool DriverStation::IsOperatorControlEnabled() {
+  return IsTeleopEnabled();
+}
+
+bool DriverStation::IsTeleopEnabled() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return !controlWord.autonomous && !controlWord.test && controlWord.enabled;
 }
 
-bool DriverStation::IsTest() const {
+bool DriverStation::IsTest() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.test;
 }
 
-bool DriverStation::IsDSAttached() const {
+bool DriverStation::IsDSAttached() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.dsAttached;
 }
 
-bool DriverStation::IsNewControlData() const {
-  std::unique_lock lock(m_waitForDataMutex);
+bool DriverStation::IsNewControlData() {
+  auto& inst = ::GetInstance();
+  std::unique_lock lock(inst.waitForDataMutex);
   int& lastCount = GetDSLastCount();
-  int currentCount = m_waitForDataCounter;
-  if (lastCount == currentCount) return false;
+  int currentCount = inst.waitForDataCounter;
+  if (lastCount == currentCount) {
+    return false;
+  }
   lastCount = currentCount;
   return true;
 }
 
-bool DriverStation::IsFMSAttached() const {
+bool DriverStation::IsFMSAttached() {
   HAL_ControlWord controlWord;
   HAL_GetControlWord(&controlWord);
   return controlWord.fmsAttached;
 }
 
-std::string DriverStation::GetGameSpecificMessage() const {
+std::string DriverStation::GetGameSpecificMessage() {
   HAL_MatchInfo info;
   HAL_GetMatchInfo(&info);
   return std::string(reinterpret_cast<char*>(info.gameSpecificMessage),
                      info.gameSpecificMessageSize);
 }
 
-std::string DriverStation::GetEventName() const {
+std::string DriverStation::GetEventName() {
   HAL_MatchInfo info;
   HAL_GetMatchInfo(&info);
   return info.eventName;
 }
 
-DriverStation::MatchType DriverStation::GetMatchType() const {
+DriverStation::MatchType DriverStation::GetMatchType() {
   HAL_MatchInfo info;
   HAL_GetMatchInfo(&info);
   return static_cast<DriverStation::MatchType>(info.matchType);
 }
 
-int DriverStation::GetMatchNumber() const {
+int DriverStation::GetMatchNumber() {
   HAL_MatchInfo info;
   HAL_GetMatchInfo(&info);
   return info.matchNumber;
 }
 
-int DriverStation::GetReplayNumber() const {
+int DriverStation::GetReplayNumber() {
   HAL_MatchInfo info;
   HAL_GetMatchInfo(&info);
   return info.replayNumber;
 }
 
-DriverStation::Alliance DriverStation::GetAlliance() const {
+DriverStation::Alliance DriverStation::GetAlliance() {
   int32_t status = 0;
   auto allianceStationID = HAL_GetAllianceStation(&status);
   switch (allianceStationID) {
@@ -453,7 +559,7 @@
   }
 }
 
-int DriverStation::GetLocation() const {
+int DriverStation::GetLocation() {
   int32_t status = 0;
   auto allianceStationID = HAL_GetAllianceStation(&status);
   switch (allianceStationID) {
@@ -471,143 +577,171 @@
   }
 }
 
-void DriverStation::WaitForData() { WaitForData(0); }
+void DriverStation::WaitForData() {
+  WaitForData(0_s);
+}
 
-bool DriverStation::WaitForData(double timeout) {
-  auto timeoutTime =
-      std::chrono::steady_clock::now() + std::chrono::duration<double>(timeout);
+bool DriverStation::WaitForData(units::second_t timeout) {
+  auto& inst = ::GetInstance();
+  auto timeoutTime = std::chrono::steady_clock::now() +
+                     std::chrono::steady_clock::duration{timeout};
 
-  std::unique_lock lock(m_waitForDataMutex);
+  std::unique_lock lock(inst.waitForDataMutex);
   int& lastCount = GetDSLastCount();
-  int currentCount = m_waitForDataCounter;
+  int currentCount = inst.waitForDataCounter;
   if (lastCount != currentCount) {
     lastCount = currentCount;
     return true;
   }
-  while (m_waitForDataCounter == currentCount) {
-    if (timeout > 0) {
-      auto timedOut = m_waitForDataCond.wait_until(lock, timeoutTime);
+  while (inst.waitForDataCounter == currentCount) {
+    if (timeout > 0_s) {
+      auto timedOut = inst.waitForDataCond.wait_until(lock, timeoutTime);
       if (timedOut == std::cv_status::timeout) {
         return false;
       }
     } else {
-      m_waitForDataCond.wait(lock);
+      inst.waitForDataCond.wait(lock);
     }
   }
-  lastCount = m_waitForDataCounter;
+  lastCount = inst.waitForDataCounter;
   return true;
 }
 
-double DriverStation::GetMatchTime() const {
-  int32_t status;
+double DriverStation::GetMatchTime() {
+  int32_t status = 0;
   return HAL_GetMatchTime(&status);
 }
 
-double DriverStation::GetBatteryVoltage() const {
+double DriverStation::GetBatteryVoltage() {
   int32_t status = 0;
   double voltage = HAL_GetVinVoltage(&status);
-  wpi_setErrorWithContext(status, "getVinVoltage");
+  FRC_CheckErrorStatus(status, "{}", "getVinVoltage");
 
   return voltage;
 }
 
-void DriverStation::WakeupWaitForData() {
-  std::scoped_lock waitLock(m_waitForDataMutex);
-  // Nofify all threads
-  m_waitForDataCounter++;
-  m_waitForDataCond.notify_all();
+void DriverStation::InDisabled(bool entering) {
+  ::GetInstance().userInDisabled = entering;
 }
 
-void DriverStation::GetData() {
+void DriverStation::InAutonomous(bool entering) {
+  ::GetInstance().userInAutonomous = entering;
+}
+
+void DriverStation::InOperatorControl(bool entering) {
+  InTeleop(entering);
+}
+
+void DriverStation::InTeleop(bool entering) {
+  ::GetInstance().userInTeleop = entering;
+}
+
+void DriverStation::InTest(bool entering) {
+  ::GetInstance().userInTest = entering;
+}
+
+void DriverStation::WakeupWaitForData() {
+  auto& inst = ::GetInstance();
+  std::scoped_lock waitLock(inst.waitForDataMutex);
+  // Nofify all threads
+  inst.waitForDataCounter++;
+  inst.waitForDataCond.notify_all();
+}
+
+/**
+ * Copy data from the DS task for the user.
+ *
+ * If no new data exists, it will just be returned, otherwise
+ * the data will be copied from the DS polling loop.
+ */
+void GetData() {
+  auto& inst = ::GetInstance();
   {
     // Compute the pressed and released buttons
     HAL_JoystickButtons currentButtons;
-    std::unique_lock lock(m_buttonEdgeMutex);
+    std::unique_lock lock(inst.buttonEdgeMutex);
 
-    for (int32_t i = 0; i < kJoystickPorts; i++) {
+    for (int32_t i = 0; i < DriverStation::kJoystickPorts; i++) {
       HAL_GetJoystickButtons(i, &currentButtons);
 
       // If buttons weren't pressed and are now, set flags in m_buttonsPressed
-      m_joystickButtonsPressed[i] |=
-          ~m_previousButtonStates[i].buttons & currentButtons.buttons;
+      inst.joystickButtonsPressed[i] |=
+          ~inst.previousButtonStates[i].buttons & currentButtons.buttons;
 
       // If buttons were pressed and aren't now, set flags in m_buttonsReleased
-      m_joystickButtonsReleased[i] |=
-          m_previousButtonStates[i].buttons & ~currentButtons.buttons;
+      inst.joystickButtonsReleased[i] |=
+          inst.previousButtonStates[i].buttons & ~currentButtons.buttons;
 
-      m_previousButtonStates[i] = currentButtons;
+      inst.previousButtonStates[i] = currentButtons;
     }
   }
 
-  WakeupWaitForData();
+  DriverStation::WakeupWaitForData();
   SendMatchData();
 }
 
 void DriverStation::SilenceJoystickConnectionWarning(bool silence) {
-  m_silenceJoystickWarning = silence;
+  ::GetInstance().silenceJoystickWarning = silence;
 }
 
-bool DriverStation::IsJoystickConnectionWarningSilenced() const {
-  return !IsFMSAttached() && m_silenceJoystickWarning;
+bool DriverStation::IsJoystickConnectionWarningSilenced() {
+  return !IsFMSAttached() && ::GetInstance().silenceJoystickWarning;
 }
 
-DriverStation::DriverStation() {
-  HAL_Initialize(500, 0);
-  m_waitForDataCounter = 0;
-
-  m_matchDataSender = std::make_unique<MatchDataSender>();
-
-  // All joysticks should default to having zero axes, povs and buttons, so
-  // uninitialized memory doesn't get sent to speed controllers.
-  for (unsigned int i = 0; i < kJoystickPorts; i++) {
-    m_joystickButtonsPressed[i] = 0;
-    m_joystickButtonsReleased[i] = 0;
-    m_previousButtonStates[i].count = 0;
-    m_previousButtonStates[i].buttons = 0;
-  }
-
-  m_dsThread = std::thread(&DriverStation::Run, this);
-}
-
-void DriverStation::ReportJoystickUnpluggedError(const wpi::Twine& message) {
-  double currentTime = Timer::GetFPGATimestamp();
-  if (currentTime > m_nextMessageTime) {
-    ReportError(message);
-    m_nextMessageTime = currentTime + kJoystickUnpluggedMessageInterval;
+void ReportJoystickUnpluggedErrorV(fmt::string_view format,
+                                   fmt::format_args args) {
+  auto& inst = GetInstance();
+  auto currentTime = Timer::GetFPGATimestamp();
+  if (currentTime > inst.nextMessageTime) {
+    ReportErrorV(err::Error, "", 0, "", format, args);
+    inst.nextMessageTime = currentTime + kJoystickUnpluggedMessageInterval;
   }
 }
 
-void DriverStation::ReportJoystickUnpluggedWarning(const wpi::Twine& message) {
-  if (IsFMSAttached() || !m_silenceJoystickWarning) {
-    double currentTime = Timer::GetFPGATimestamp();
-    if (currentTime > m_nextMessageTime) {
-      ReportWarning(message);
-      m_nextMessageTime = currentTime + kJoystickUnpluggedMessageInterval;
+void ReportJoystickUnpluggedWarningV(fmt::string_view format,
+                                     fmt::format_args args) {
+  auto& inst = GetInstance();
+  if (DriverStation::IsFMSAttached() || !inst.silenceJoystickWarning) {
+    auto currentTime = Timer::GetFPGATimestamp();
+    if (currentTime > inst.nextMessageTime) {
+      ReportErrorV(warn::Warning, "", 0, "", format, args);
+      inst.nextMessageTime = currentTime + kJoystickUnpluggedMessageInterval;
     }
   }
 }
 
-void DriverStation::Run() {
-  m_isRunning = true;
+void Run() {
+  auto& inst = GetInstance();
+  inst.isRunning = true;
   int safetyCounter = 0;
-  while (m_isRunning) {
+  while (inst.isRunning) {
     HAL_WaitForDSData();
     GetData();
 
-    if (IsDisabled()) safetyCounter = 0;
+    if (DriverStation::IsDisabled()) {
+      safetyCounter = 0;
+    }
 
     if (++safetyCounter >= 4) {
       MotorSafety::CheckMotors();
       safetyCounter = 0;
     }
-    if (m_userInDisabled) HAL_ObserveUserProgramDisabled();
-    if (m_userInAutonomous) HAL_ObserveUserProgramAutonomous();
-    if (m_userInTeleop) HAL_ObserveUserProgramTeleop();
-    if (m_userInTest) HAL_ObserveUserProgramTest();
+    if (inst.userInDisabled) {
+      HAL_ObserveUserProgramDisabled();
+    }
+    if (inst.userInAutonomous) {
+      HAL_ObserveUserProgramAutonomous();
+    }
+    if (inst.userInTeleop) {
+      HAL_ObserveUserProgramTeleop();
+    }
+    if (inst.userInTest) {
+      HAL_ObserveUserProgramTest();
+    }
   }
 }
 
-void DriverStation::SendMatchData() {
+void SendMatchData() {
   int32_t status = 0;
   HAL_AllianceStationID alliance = HAL_GetAllianceStation(&status);
   bool isRedAlliance = false;
@@ -642,20 +776,20 @@
   HAL_MatchInfo tmpDataStore;
   HAL_GetMatchInfo(&tmpDataStore);
 
-  m_matchDataSender->alliance.SetBoolean(isRedAlliance);
-  m_matchDataSender->station.SetDouble(stationNumber);
-  m_matchDataSender->eventName.SetString(tmpDataStore.eventName);
-  m_matchDataSender->gameSpecificMessage.SetString(
+  auto& inst = GetInstance();
+  inst.matchDataSender.alliance.Set(isRedAlliance);
+  inst.matchDataSender.station.Set(stationNumber);
+  inst.matchDataSender.eventName.Set(tmpDataStore.eventName);
+  inst.matchDataSender.gameSpecificMessage.Set(
       std::string(reinterpret_cast<char*>(tmpDataStore.gameSpecificMessage),
                   tmpDataStore.gameSpecificMessageSize));
-  m_matchDataSender->matchNumber.SetDouble(tmpDataStore.matchNumber);
-  m_matchDataSender->replayNumber.SetDouble(tmpDataStore.replayNumber);
-  m_matchDataSender->matchType.SetDouble(
-      static_cast<int>(tmpDataStore.matchType));
+  inst.matchDataSender.matchNumber.Set(tmpDataStore.matchNumber);
+  inst.matchDataSender.replayNumber.Set(tmpDataStore.replayNumber);
+  inst.matchDataSender.matchType.Set(static_cast<int>(tmpDataStore.matchType));
 
   HAL_ControlWord ctlWord;
   HAL_GetControlWord(&ctlWord);
   int32_t wordInt = 0;
   std::memcpy(&wordInt, &ctlWord, sizeof(wordInt));
-  m_matchDataSender->controlWord.SetDouble(wordInt);
+  inst.matchDataSender.controlWord.Set(wordInt);
 }
diff --git a/wpilibc/src/main/native/cpp/DutyCycle.cpp b/wpilibc/src/main/native/cpp/DutyCycle.cpp
index 7e4e98d..a8375e0 100644
--- a/wpilibc/src/main/native/cpp/DutyCycle.cpp
+++ b/wpilibc/src/main/native/cpp/DutyCycle.cpp
@@ -1,46 +1,43 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DutyCycle.h"
 
 #include <hal/DutyCycle.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
 
-#include "frc/Base.h"
 #include "frc/DigitalSource.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
 DutyCycle::DutyCycle(DigitalSource* source)
-    : m_source{source, NullDeleter<DigitalSource>()} {
-  if (m_source == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitDutyCycle();
+    : m_source{source, wpi::NullDeleter<DigitalSource>()} {
+  if (!m_source) {
+    throw FRC_MakeError(err::NullParameter, "{}", "source");
   }
+  InitDutyCycle();
 }
 
 DutyCycle::DutyCycle(DigitalSource& source)
-    : m_source{&source, NullDeleter<DigitalSource>()} {
+    : m_source{&source, wpi::NullDeleter<DigitalSource>()} {
   InitDutyCycle();
 }
 
 DutyCycle::DutyCycle(std::shared_ptr<DigitalSource> source)
     : m_source{std::move(source)} {
-  if (m_source == nullptr) {
-    wpi_setWPIError(NullParameter);
-  } else {
-    InitDutyCycle();
+  if (!m_source) {
+    throw FRC_MakeError(err::NullParameter, "{}", "source");
   }
+  InitDutyCycle();
 }
 
-DutyCycle::~DutyCycle() { HAL_FreeDutyCycle(m_handle); }
+DutyCycle::~DutyCycle() {
+  HAL_FreeDutyCycle(m_handle);
+}
 
 void DutyCycle::InitDutyCycle() {
   int32_t status = 0;
@@ -49,50 +46,52 @@
                               static_cast<HAL_AnalogTriggerType>(
                                   m_source->GetAnalogTriggerTypeForRouting()),
                               &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   int index = GetFPGAIndex();
   HAL_Report(HALUsageReporting::kResourceType_DutyCycle, index + 1);
-  SendableRegistry::GetInstance().AddLW(this, "Duty Cycle", index);
+  wpi::SendableRegistry::AddLW(this, "Duty Cycle", index);
 }
 
 int DutyCycle::GetFPGAIndex() const {
   int32_t status = 0;
   auto retVal = HAL_GetDutyCycleFPGAIndex(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return retVal;
 }
 
 int DutyCycle::GetFrequency() const {
   int32_t status = 0;
   auto retVal = HAL_GetDutyCycleFrequency(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return retVal;
 }
 
 double DutyCycle::GetOutput() const {
   int32_t status = 0;
   auto retVal = HAL_GetDutyCycleOutput(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return retVal;
 }
 
 unsigned int DutyCycle::GetOutputRaw() const {
   int32_t status = 0;
   auto retVal = HAL_GetDutyCycleOutputRaw(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return retVal;
 }
 
 unsigned int DutyCycle::GetOutputScaleFactor() const {
   int32_t status = 0;
   auto retVal = HAL_GetDutyCycleOutputScaleFactor(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", GetSourceChannel());
   return retVal;
 }
 
-int DutyCycle::GetSourceChannel() const { return m_source->GetChannel(); }
+int DutyCycle::GetSourceChannel() const {
+  return m_source->GetChannel();
+}
 
-void DutyCycle::InitSendable(SendableBuilder& builder) {
+void DutyCycle::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Duty Cycle");
   builder.AddDoubleProperty(
       "Frequency", [this] { return this->GetFrequency(); }, nullptr);
diff --git a/wpilibc/src/main/native/cpp/DutyCycleEncoder.cpp b/wpilibc/src/main/native/cpp/DutyCycleEncoder.cpp
index 4fc5457..8e994e9 100644
--- a/wpilibc/src/main/native/cpp/DutyCycleEncoder.cpp
+++ b/wpilibc/src/main/native/cpp/DutyCycleEncoder.cpp
@@ -1,19 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/DutyCycleEncoder.h"
 
-#include "frc/Base.h"
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+
 #include "frc/Counter.h"
 #include "frc/DigitalInput.h"
 #include "frc/DigitalSource.h"
-#include "frc/DriverStation.h"
 #include "frc/DutyCycle.h"
-#include "frc/smartdashboard/SendableBuilder.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -24,12 +22,12 @@
 }
 
 DutyCycleEncoder::DutyCycleEncoder(DutyCycle& dutyCycle)
-    : m_dutyCycle{&dutyCycle, NullDeleter<DutyCycle>{}} {
+    : m_dutyCycle{&dutyCycle, wpi::NullDeleter<DutyCycle>{}} {
   Init();
 }
 
 DutyCycleEncoder::DutyCycleEncoder(DutyCycle* dutyCycle)
-    : m_dutyCycle{dutyCycle, NullDeleter<DutyCycle>{}} {
+    : m_dutyCycle{dutyCycle, wpi::NullDeleter<DutyCycle>{}} {
   Init();
 }
 
@@ -54,13 +52,16 @@
 }
 
 void DutyCycleEncoder::Init() {
-  m_simDevice = hal::SimDevice{"DutyCycleEncoder", m_dutyCycle->GetFPGAIndex()};
+  m_simDevice = hal::SimDevice{"DutyCycle:DutyCycleEncoder",
+                               m_dutyCycle->GetSourceChannel()};
 
   if (m_simDevice) {
-    m_simPosition = m_simDevice.CreateDouble("Position", false, 0.0);
-    m_simDistancePerRotation =
-        m_simDevice.CreateDouble("DistancePerRotation", false, 1.0);
-    m_simIsConnected = m_simDevice.CreateBoolean("Connected", false, true);
+    m_simPosition =
+        m_simDevice.CreateDouble("position", hal::SimDevice::kInput, 0.0);
+    m_simDistancePerRotation = m_simDevice.CreateDouble(
+        "distance_per_rot", hal::SimDevice::kOutput, 1.0);
+    m_simIsConnected =
+        m_simDevice.CreateBoolean("connected", hal::SimDevice::kInput, true);
   } else {
     m_analogTrigger = std::make_unique<AnalogTrigger>(m_dutyCycle.get());
     m_analogTrigger->SetLimitsDutyCycle(0.25, 0.75);
@@ -71,12 +72,14 @@
         m_analogTrigger->CreateOutput(AnalogTriggerType::kFallingPulse));
   }
 
-  SendableRegistry::GetInstance().AddLW(this, "DutyCycle Encoder",
-                                        m_dutyCycle->GetSourceChannel());
+  wpi::SendableRegistry::AddLW(this, "DutyCycle Encoder",
+                               m_dutyCycle->GetSourceChannel());
 }
 
 units::turn_t DutyCycleEncoder::Get() const {
-  if (m_simPosition) return units::turn_t{m_simPosition.Get()};
+  if (m_simPosition) {
+    return units::turn_t{m_simPosition.Get()};
+  }
 
   // As the values are not atomic, keep trying until we get 2 reads of the same
   // value If we don't within 10 attempts, error
@@ -92,7 +95,8 @@
     }
   }
 
-  frc::DriverStation::GetInstance().ReportWarning(
+  FRC_ReportError(
+      warn::Warning, "{}",
       "Failed to read DutyCycle Encoder. Potential Speed Overrun. Returning "
       "last value");
   return m_lastPosition;
@@ -108,7 +112,7 @@
 }
 
 double DutyCycleEncoder::GetDistance() const {
-  return Get().to<double>() * GetDistancePerRotation();
+  return Get().value() * GetDistancePerRotation();
 }
 
 int DutyCycleEncoder::GetFrequency() const {
@@ -116,12 +120,16 @@
 }
 
 void DutyCycleEncoder::Reset() {
-  if (m_counter) m_counter->Reset();
+  if (m_counter) {
+    m_counter->Reset();
+  }
   m_positionOffset = m_dutyCycle->GetOutput();
 }
 
 bool DutyCycleEncoder::IsConnected() const {
-  if (m_simIsConnected) return m_simIsConnected.Get();
+  if (m_simIsConnected) {
+    return m_simIsConnected.Get();
+  }
   return GetFrequency() > m_frequencyThreshold;
 }
 
@@ -140,7 +148,7 @@
   return m_dutyCycle->GetSourceChannel();
 }
 
-void DutyCycleEncoder::InitSendable(SendableBuilder& builder) {
+void DutyCycleEncoder::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("AbsoluteEncoder");
   builder.AddDoubleProperty(
       "Distance", [this] { return this->GetDistance(); }, nullptr);
diff --git a/wpilibc/src/main/native/cpp/Encoder.cpp b/wpilibc/src/main/native/cpp/Encoder.cpp
index 87bb45f..bef6d76 100644
--- a/wpilibc/src/main/native/cpp/Encoder.cpp
+++ b/wpilibc/src/main/native/cpp/Encoder.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Encoder.h"
 
@@ -11,12 +8,12 @@
 
 #include <hal/Encoder.h>
 #include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/Base.h"
 #include "frc/DigitalInput.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -25,196 +22,177 @@
   m_aSource = std::make_shared<DigitalInput>(aChannel);
   m_bSource = std::make_shared<DigitalInput>(bChannel);
   InitEncoder(reverseDirection, encodingType);
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, m_aSource.get());
-  registry.AddChild(this, m_bSource.get());
+  wpi::SendableRegistry::AddChild(this, m_aSource.get());
+  wpi::SendableRegistry::AddChild(this, m_bSource.get());
 }
 
 Encoder::Encoder(DigitalSource* aSource, DigitalSource* bSource,
                  bool reverseDirection, EncodingType encodingType)
-    : m_aSource(aSource, NullDeleter<DigitalSource>()),
-      m_bSource(bSource, NullDeleter<DigitalSource>()) {
-  if (m_aSource == nullptr || m_bSource == nullptr)
-    wpi_setWPIError(NullParameter);
-  else
-    InitEncoder(reverseDirection, encodingType);
+    : m_aSource(aSource, wpi::NullDeleter<DigitalSource>()),
+      m_bSource(bSource, wpi::NullDeleter<DigitalSource>()) {
+  if (!m_aSource) {
+    throw FRC_MakeError(err::NullParameter, "{}", "aSource");
+  }
+  if (!m_bSource) {
+    throw FRC_MakeError(err::NullParameter, "{}", "bSource");
+  }
+  InitEncoder(reverseDirection, encodingType);
 }
 
 Encoder::Encoder(DigitalSource& aSource, DigitalSource& bSource,
                  bool reverseDirection, EncodingType encodingType)
-    : m_aSource(&aSource, NullDeleter<DigitalSource>()),
-      m_bSource(&bSource, NullDeleter<DigitalSource>()) {
+    : m_aSource(&aSource, wpi::NullDeleter<DigitalSource>()),
+      m_bSource(&bSource, wpi::NullDeleter<DigitalSource>()) {
   InitEncoder(reverseDirection, encodingType);
 }
 
 Encoder::Encoder(std::shared_ptr<DigitalSource> aSource,
                  std::shared_ptr<DigitalSource> bSource, bool reverseDirection,
                  EncodingType encodingType)
-    : m_aSource(aSource), m_bSource(bSource) {
-  if (m_aSource == nullptr || m_bSource == nullptr)
-    wpi_setWPIError(NullParameter);
-  else
-    InitEncoder(reverseDirection, encodingType);
+    : m_aSource(std::move(aSource)), m_bSource(std::move(bSource)) {
+  if (!m_aSource) {
+    throw FRC_MakeError(err::NullParameter, "{}", "aSource");
+  }
+  if (!m_bSource) {
+    throw FRC_MakeError(err::NullParameter, "{}", "bSource");
+  }
+  InitEncoder(reverseDirection, encodingType);
 }
 
 Encoder::~Encoder() {
   int32_t status = 0;
   HAL_FreeEncoder(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "{}", "FreeEncoder");
 }
 
 int Encoder::Get() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetEncoder(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Get");
   return value;
 }
 
 void Encoder::Reset() {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_ResetEncoder(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Reset");
 }
 
-double Encoder::GetPeriod() const {
-  if (StatusIsFatal()) return 0.0;
+units::second_t Encoder::GetPeriod() const {
   int32_t status = 0;
   double value = HAL_GetEncoderPeriod(m_encoder, &status);
-  wpi_setHALError(status);
-  return value;
+  FRC_CheckErrorStatus(status, "{}", "GetPeriod");
+  return units::second_t{value};
 }
 
-void Encoder::SetMaxPeriod(double maxPeriod) {
-  if (StatusIsFatal()) return;
+void Encoder::SetMaxPeriod(units::second_t maxPeriod) {
   int32_t status = 0;
-  HAL_SetEncoderMaxPeriod(m_encoder, maxPeriod, &status);
-  wpi_setHALError(status);
+  HAL_SetEncoderMaxPeriod(m_encoder, maxPeriod.value(), &status);
+  FRC_CheckErrorStatus(status, "{}", "SetMaxPeriod");
 }
 
 bool Encoder::GetStopped() const {
-  if (StatusIsFatal()) return true;
   int32_t status = 0;
   bool value = HAL_GetEncoderStopped(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetStopped");
   return value;
 }
 
 bool Encoder::GetDirection() const {
-  if (StatusIsFatal()) return false;
   int32_t status = 0;
   bool value = HAL_GetEncoderDirection(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetDirection");
   return value;
 }
 
 int Encoder::GetRaw() const {
-  if (StatusIsFatal()) return 0;
   int32_t status = 0;
   int value = HAL_GetEncoderRaw(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetRaw");
   return value;
 }
 
 int Encoder::GetEncodingScale() const {
   int32_t status = 0;
   int val = HAL_GetEncoderEncodingScale(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetEncodingScale");
   return val;
 }
 
 double Encoder::GetDistance() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double value = HAL_GetEncoderDistance(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetDistance");
   return value;
 }
 
 double Encoder::GetRate() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double value = HAL_GetEncoderRate(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetRate");
   return value;
 }
 
 void Encoder::SetMinRate(double minRate) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetEncoderMinRate(m_encoder, minRate, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetMinRate");
 }
 
 void Encoder::SetDistancePerPulse(double distancePerPulse) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetEncoderDistancePerPulse(m_encoder, distancePerPulse, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetDistancePerPulse");
 }
 
 double Encoder::GetDistancePerPulse() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double distancePerPulse = HAL_GetEncoderDistancePerPulse(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetDistancePerPulse");
   return distancePerPulse;
 }
 
 void Encoder::SetReverseDirection(bool reverseDirection) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetEncoderReverseDirection(m_encoder, reverseDirection, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetReverseDirection");
 }
 
 void Encoder::SetSamplesToAverage(int samplesToAverage) {
   if (samplesToAverage < 1 || samplesToAverage > 127) {
-    wpi_setWPIErrorWithContext(
-        ParameterOutOfRange,
-        "Average counter values must be between 1 and 127");
-    return;
+    throw FRC_MakeError(
+        err::ParameterOutOfRange,
+        "Average counter values must be between 1 and 127, got {}",
+        samplesToAverage);
   }
   int32_t status = 0;
   HAL_SetEncoderSamplesToAverage(m_encoder, samplesToAverage, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetSamplesToAverage");
 }
 
 int Encoder::GetSamplesToAverage() const {
   int32_t status = 0;
   int result = HAL_GetEncoderSamplesToAverage(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetSamplesToAverage");
   return result;
 }
 
-double Encoder::PIDGet() {
-  if (StatusIsFatal()) return 0.0;
-  switch (GetPIDSourceType()) {
-    case PIDSourceType::kDisplacement:
-      return GetDistance();
-    case PIDSourceType::kRate:
-      return GetRate();
-    default:
-      return 0.0;
-  }
-}
-
 void Encoder::SetIndexSource(int channel, Encoder::IndexingType type) {
   // Force digital input if just given an index
   m_indexSource = std::make_shared<DigitalInput>(channel);
-  SendableRegistry::GetInstance().AddChild(this, m_indexSource.get());
+  wpi::SendableRegistry::AddChild(this, m_indexSource.get());
   SetIndexSource(*m_indexSource.get(), type);
 }
 
 void Encoder::SetIndexSource(const DigitalSource& source,
                              Encoder::IndexingType type) {
   int32_t status = 0;
-  HAL_SetEncoderIndexSource(
-      m_encoder, source.GetPortHandleForRouting(),
-      (HAL_AnalogTriggerType)source.GetAnalogTriggerTypeForRouting(),
-      (HAL_EncoderIndexingType)type, &status);
-  wpi_setHALError(status);
+  HAL_SetEncoderIndexSource(m_encoder, source.GetPortHandleForRouting(),
+                            static_cast<HAL_AnalogTriggerType>(
+                                source.GetAnalogTriggerTypeForRouting()),
+                            static_cast<HAL_EncoderIndexingType>(type),
+                            &status);
+  FRC_CheckErrorStatus(status, "{}", "SetIndexSource");
 }
 
 void Encoder::SetSimDevice(HAL_SimDeviceHandle device) {
@@ -224,47 +202,49 @@
 int Encoder::GetFPGAIndex() const {
   int32_t status = 0;
   int val = HAL_GetEncoderFPGAIndex(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFPGAIndex");
   return val;
 }
 
-void Encoder::InitSendable(SendableBuilder& builder) {
+void Encoder::InitSendable(wpi::SendableBuilder& builder) {
   int32_t status = 0;
   HAL_EncoderEncodingType type = HAL_GetEncoderEncodingType(m_encoder, &status);
-  wpi_setHALError(status);
-  if (type == HAL_EncoderEncodingType::HAL_Encoder_k4X)
+  FRC_CheckErrorStatus(status, "{}", "GetEncodingType");
+  if (type == HAL_EncoderEncodingType::HAL_Encoder_k4X) {
     builder.SetSmartDashboardType("Quadrature Encoder");
-  else
+  } else {
     builder.SetSmartDashboardType("Encoder");
+  }
 
   builder.AddDoubleProperty(
-      "Speed", [=]() { return GetRate(); }, nullptr);
+      "Speed", [=] { return GetRate(); }, nullptr);
   builder.AddDoubleProperty(
-      "Distance", [=]() { return GetDistance(); }, nullptr);
+      "Distance", [=] { return GetDistance(); }, nullptr);
   builder.AddDoubleProperty(
-      "Distance per Tick", [=]() { return GetDistancePerPulse(); }, nullptr);
+      "Distance per Tick", [=] { return GetDistancePerPulse(); }, nullptr);
 }
 
 void Encoder::InitEncoder(bool reverseDirection, EncodingType encodingType) {
   int32_t status = 0;
   m_encoder = HAL_InitializeEncoder(
       m_aSource->GetPortHandleForRouting(),
-      (HAL_AnalogTriggerType)m_aSource->GetAnalogTriggerTypeForRouting(),
+      static_cast<HAL_AnalogTriggerType>(
+          m_aSource->GetAnalogTriggerTypeForRouting()),
       m_bSource->GetPortHandleForRouting(),
-      (HAL_AnalogTriggerType)m_bSource->GetAnalogTriggerTypeForRouting(),
-      reverseDirection, (HAL_EncoderEncodingType)encodingType, &status);
-  wpi_setHALError(status);
+      static_cast<HAL_AnalogTriggerType>(
+          m_bSource->GetAnalogTriggerTypeForRouting()),
+      reverseDirection, static_cast<HAL_EncoderEncodingType>(encodingType),
+      &status);
+  FRC_CheckErrorStatus(status, "{}", "InitEncoder");
 
   HAL_Report(HALUsageReporting::kResourceType_Encoder, GetFPGAIndex() + 1,
              encodingType);
-  SendableRegistry::GetInstance().AddLW(this, "Encoder",
-                                        m_aSource->GetChannel());
+  wpi::SendableRegistry::AddLW(this, "Encoder", m_aSource->GetChannel());
 }
 
 double Encoder::DecodingScaleFactor() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double val = HAL_GetEncoderDecodingScaleFactor(m_encoder, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "DecodingScaleFactor");
   return val;
 }
diff --git a/wpilibc/src/main/native/cpp/Error.cpp b/wpilibc/src/main/native/cpp/Error.cpp
deleted file mode 100644
index 5e072c9..0000000
--- a/wpilibc/src/main/native/cpp/Error.cpp
+++ /dev/null
@@ -1,99 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Error.h"
-
-#include <wpi/Path.h>
-#include <wpi/StackTrace.h>
-
-#include "frc/Base.h"
-#include "frc/DriverStation.h"
-#include "frc/Timer.h"
-
-using namespace frc;
-
-Error::Error(Code code, const wpi::Twine& contextMessage,
-             wpi::StringRef filename, wpi::StringRef function, int lineNumber,
-             const ErrorBase* originatingObject) {
-  Set(code, contextMessage, filename, function, lineNumber, originatingObject);
-}
-
-bool Error::operator<(const Error& rhs) const {
-  if (m_code < rhs.m_code) {
-    return true;
-  } else if (m_message < rhs.m_message) {
-    return true;
-  } else if (m_filename < rhs.m_filename) {
-    return true;
-  } else if (m_function < rhs.m_function) {
-    return true;
-  } else if (m_lineNumber < rhs.m_lineNumber) {
-    return true;
-  } else if (m_originatingObject < rhs.m_originatingObject) {
-    return true;
-  } else if (m_timestamp < rhs.m_timestamp) {
-    return true;
-  } else {
-    return false;
-  }
-}
-
-Error::Code Error::GetCode() const { return m_code; }
-
-std::string Error::GetMessage() const { return m_message; }
-
-std::string Error::GetFilename() const { return m_filename; }
-
-std::string Error::GetFunction() const { return m_function; }
-
-int Error::GetLineNumber() const { return m_lineNumber; }
-
-const ErrorBase* Error::GetOriginatingObject() const {
-  return m_originatingObject;
-}
-
-double Error::GetTimestamp() const { return m_timestamp; }
-
-void Error::Set(Code code, const wpi::Twine& contextMessage,
-                wpi::StringRef filename, wpi::StringRef function,
-                int lineNumber, const ErrorBase* originatingObject) {
-  bool report = true;
-
-  if (code == m_code && GetTime() - m_timestamp < 1) {
-    report = false;
-  }
-
-  m_code = code;
-  m_message = contextMessage.str();
-  m_filename = filename;
-  m_function = function;
-  m_lineNumber = lineNumber;
-  m_originatingObject = originatingObject;
-
-  if (report) {
-    m_timestamp = GetTime();
-    Report();
-  }
-}
-
-void Error::Report() {
-  DriverStation::ReportError(
-      true, m_code, m_message,
-      m_function + wpi::Twine(" [") + wpi::sys::path::filename(m_filename) +
-          wpi::Twine(':') + wpi::Twine(m_lineNumber) + wpi::Twine(']'),
-      wpi::GetStackTrace(4));
-}
-
-void Error::Clear() {
-  m_code = 0;
-  m_message = "";
-  m_filename = "";
-  m_function = "";
-  m_lineNumber = 0;
-  m_originatingObject = nullptr;
-  m_timestamp = 0.0;
-}
diff --git a/wpilibc/src/main/native/cpp/ErrorBase.cpp b/wpilibc/src/main/native/cpp/ErrorBase.cpp
deleted file mode 100644
index 8c7c5a2..0000000
--- a/wpilibc/src/main/native/cpp/ErrorBase.cpp
+++ /dev/null
@@ -1,187 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/ErrorBase.h"
-
-#include <cerrno>
-#include <cstring>
-#include <set>
-#include <utility>
-
-#include <hal/HALBase.h>
-#include <wpi/Format.h>
-#include <wpi/SmallString.h>
-#include <wpi/mutex.h>
-#include <wpi/raw_ostream.h>
-
-#include "frc/Base.h"
-
-using namespace frc;
-
-namespace {
-struct GlobalErrors {
-  wpi::mutex mutex;
-  std::set<Error> errors;
-  const Error* lastError{nullptr};
-
-  static GlobalErrors& GetInstance();
-  static void Insert(const Error& error);
-  static void Insert(Error&& error);
-};
-}  // namespace
-
-GlobalErrors& GlobalErrors::GetInstance() {
-  static GlobalErrors inst;
-  return inst;
-}
-
-void GlobalErrors::Insert(const Error& error) {
-  GlobalErrors& inst = GetInstance();
-  std::scoped_lock lock(inst.mutex);
-  inst.lastError = &(*inst.errors.insert(error).first);
-}
-
-void GlobalErrors::Insert(Error&& error) {
-  GlobalErrors& inst = GetInstance();
-  std::scoped_lock lock(inst.mutex);
-  inst.lastError = &(*inst.errors.insert(std::move(error)).first);
-}
-
-ErrorBase::ErrorBase() { HAL_Initialize(500, 0); }
-
-Error& ErrorBase::GetError() { return m_error; }
-
-const Error& ErrorBase::GetError() const { return m_error; }
-
-void ErrorBase::ClearError() const { m_error.Clear(); }
-
-void ErrorBase::SetErrnoError(const wpi::Twine& contextMessage,
-                              wpi::StringRef filename, wpi::StringRef function,
-                              int lineNumber) const {
-  wpi::SmallString<128> buf;
-  wpi::raw_svector_ostream err(buf);
-  int errNo = errno;
-  if (errNo == 0) {
-    err << "OK: ";
-  } else {
-    err << std::strerror(errNo) << " (" << wpi::format_hex(errNo, 10, true)
-        << "): ";
-  }
-
-  // Set the current error information for this object.
-  m_error.Set(-1, err.str() + contextMessage, filename, function, lineNumber,
-              this);
-
-  // Update the global error if there is not one already set.
-  GlobalErrors::Insert(m_error);
-}
-
-void ErrorBase::SetImaqError(int success, const wpi::Twine& contextMessage,
-                             wpi::StringRef filename, wpi::StringRef function,
-                             int lineNumber) const {
-  // If there was an error
-  if (success <= 0) {
-    // Set the current error information for this object.
-    m_error.Set(success, wpi::Twine(success) + ": " + contextMessage, filename,
-                function, lineNumber, this);
-
-    // Update the global error if there is not one already set.
-    GlobalErrors::Insert(m_error);
-  }
-}
-
-void ErrorBase::SetError(Error::Code code, const wpi::Twine& contextMessage,
-                         wpi::StringRef filename, wpi::StringRef function,
-                         int lineNumber) const {
-  //  If there was an error
-  if (code != 0) {
-    //  Set the current error information for this object.
-    m_error.Set(code, contextMessage, filename, function, lineNumber, this);
-
-    // Update the global error if there is not one already set.
-    GlobalErrors::Insert(m_error);
-  }
-}
-
-void ErrorBase::SetErrorRange(Error::Code code, int32_t minRange,
-                              int32_t maxRange, int32_t requestedValue,
-                              const wpi::Twine& contextMessage,
-                              wpi::StringRef filename, wpi::StringRef function,
-                              int lineNumber) const {
-  //  If there was an error
-  if (code != 0) {
-    //  Set the current error information for this object.
-    m_error.Set(code,
-                contextMessage + ", Minimum Value: " + wpi::Twine(minRange) +
-                    ", MaximumValue: " + wpi::Twine(maxRange) +
-                    ", Requested Value: " + wpi::Twine(requestedValue),
-                filename, function, lineNumber, this);
-
-    // Update the global error if there is not one already set.
-    GlobalErrors::Insert(m_error);
-  }
-}
-
-void ErrorBase::SetWPIError(const wpi::Twine& errorMessage, Error::Code code,
-                            const wpi::Twine& contextMessage,
-                            wpi::StringRef filename, wpi::StringRef function,
-                            int lineNumber) const {
-  //  Set the current error information for this object.
-  m_error.Set(code, errorMessage + ": " + contextMessage, filename, function,
-              lineNumber, this);
-
-  // Update the global error if there is not one already set.
-  GlobalErrors::Insert(m_error);
-}
-
-void ErrorBase::CloneError(const ErrorBase& rhs) const {
-  m_error = rhs.GetError();
-}
-
-bool ErrorBase::StatusIsFatal() const { return m_error.GetCode() < 0; }
-
-void ErrorBase::SetGlobalError(Error::Code code,
-                               const wpi::Twine& contextMessage,
-                               wpi::StringRef filename, wpi::StringRef function,
-                               int lineNumber) {
-  // If there was an error
-  if (code != 0) {
-    // Set the current error information for this object.
-    GlobalErrors::Insert(
-        Error(code, contextMessage, filename, function, lineNumber, nullptr));
-  }
-}
-
-void ErrorBase::SetGlobalWPIError(const wpi::Twine& errorMessage,
-                                  const wpi::Twine& contextMessage,
-                                  wpi::StringRef filename,
-                                  wpi::StringRef function, int lineNumber) {
-  GlobalErrors::Insert(Error(-1, errorMessage + ": " + contextMessage, filename,
-                             function, lineNumber, nullptr));
-}
-
-Error ErrorBase::GetGlobalError() {
-  auto& inst = GlobalErrors::GetInstance();
-  std::scoped_lock mutex(inst.mutex);
-  if (!inst.lastError) return Error{};
-  return *inst.lastError;
-}
-
-std::vector<Error> ErrorBase::GetGlobalErrors() {
-  auto& inst = GlobalErrors::GetInstance();
-  std::scoped_lock mutex(inst.mutex);
-  std::vector<Error> rv;
-  for (auto&& error : inst.errors) rv.push_back(error);
-  return rv;
-}
-
-void ErrorBase::ClearGlobalErrors() {
-  auto& inst = GlobalErrors::GetInstance();
-  std::scoped_lock mutex(inst.mutex);
-  inst.errors.clear();
-  inst.lastError = nullptr;
-}
diff --git a/wpilibc/src/main/native/cpp/Errors.cpp b/wpilibc/src/main/native/cpp/Errors.cpp
new file mode 100644
index 0000000..0ff4dc1
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/Errors.cpp
@@ -0,0 +1,81 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/Errors.h"
+
+#include <exception>
+
+#include <hal/DriverStation.h>
+#include <hal/HALBase.h>
+#include <wpi/StackTrace.h>
+#include <wpi/fs.h>
+
+using namespace frc;
+
+RuntimeError::RuntimeError(int32_t code, std::string&& loc, std::string&& stack,
+                           std::string&& message)
+    : runtime_error{std::move(message)}, m_data{std::make_shared<Data>()} {
+  m_data->code = code;
+  m_data->loc = std::move(loc);
+  m_data->stack = stack;
+}
+
+RuntimeError::RuntimeError(int32_t code, const char* fileName, int lineNumber,
+                           const char* funcName, std::string&& stack,
+                           std::string&& message)
+    : RuntimeError{
+          code,
+          fmt::format("{} [{}:{}]", funcName,
+                      fs::path{fileName}.filename().string(), lineNumber),
+          std::move(stack), std::move(message)} {}
+
+void RuntimeError::Report() const {
+  HAL_SendError(m_data->code < 0, m_data->code, 0, what(), m_data->loc.c_str(),
+                m_data->stack.c_str(), 1);
+}
+
+const char* frc::GetErrorMessage(int32_t* code) {
+  switch (*code) {
+#define S(label, offset, message) \
+  case err::label:                \
+    return message;
+#include "frc/WPIErrors.mac"
+#undef S
+#define S(label, offset, message) \
+  case warn::label:               \
+    return message;
+#include "frc/WPIWarnings.mac"
+#undef S
+    default:
+      return HAL_GetLastError(code);
+  }
+}
+
+void frc::ReportErrorV(int32_t status, const char* fileName, int lineNumber,
+                       const char* funcName, fmt::string_view format,
+                       fmt::format_args args) {
+  if (status == 0) {
+    return;
+  }
+  fmt::memory_buffer out;
+  fmt::format_to(fmt::appender{out}, "{}: ", GetErrorMessage(&status));
+  fmt::vformat_to(fmt::appender{out}, format, args);
+  out.push_back('\0');
+  HAL_SendError(status < 0, status, 0, out.data(), funcName,
+                wpi::GetStackTrace(2).c_str(), 1);
+}
+
+RuntimeError frc::MakeErrorV(int32_t status, const char* fileName,
+                             int lineNumber, const char* funcName,
+                             fmt::string_view format, fmt::format_args args) {
+  fmt::memory_buffer out;
+  fmt::format_to(fmt::appender{out}, "{}: ", GetErrorMessage(&status));
+  fmt::vformat_to(fmt::appender{out}, format, args);
+  return RuntimeError{status,
+                      fileName,
+                      lineNumber,
+                      funcName,
+                      wpi::GetStackTrace(2),
+                      fmt::to_string(out)};
+}
diff --git a/wpilibc/src/main/native/cpp/Filesystem.cpp b/wpilibc/src/main/native/cpp/Filesystem.cpp
index 7d2ea1d..d497779 100644
--- a/wpilibc/src/main/native/cpp/Filesystem.cpp
+++ b/wpilibc/src/main/native/cpp/Filesystem.cpp
@@ -1,37 +1,29 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Filesystem.h"
 
-#include <wpi/FileSystem.h>
-#include <wpi/Path.h>
+#include <wpi/fs.h>
 
 #include "frc/RobotBase.h"
 
-void frc::filesystem::GetLaunchDirectory(wpi::SmallVectorImpl<char>& result) {
-  wpi::sys::fs::current_path(result);
+std::string frc::filesystem::GetLaunchDirectory() {
+  return fs::current_path().string();
 }
 
-void frc::filesystem::GetOperatingDirectory(
-    wpi::SmallVectorImpl<char>& result) {
+std::string frc::filesystem::GetOperatingDirectory() {
   if constexpr (RobotBase::IsReal()) {
-    wpi::sys::path::native("/home/lvuser", result);
+    return "/home/lvuser";
   } else {
-    frc::filesystem::GetLaunchDirectory(result);
+    return frc::filesystem::GetLaunchDirectory();
   }
 }
 
-void frc::filesystem::GetDeployDirectory(wpi::SmallVectorImpl<char>& result) {
-  frc::filesystem::GetOperatingDirectory(result);
+std::string frc::filesystem::GetDeployDirectory() {
   if constexpr (RobotBase::IsReal()) {
-    wpi::sys::path::append(result, "deploy");
+    return "/home/lvuser/deploy";
   } else {
-    wpi::sys::path::append(result, "src");
-    wpi::sys::path::append(result, "main");
-    wpi::sys::path::append(result, "deploy");
+    return (fs::current_path() / "src" / "main" / "deploy").string();
   }
 }
diff --git a/wpilibc/src/main/native/cpp/GearTooth.cpp b/wpilibc/src/main/native/cpp/GearTooth.cpp
deleted file mode 100644
index 5fb5021..0000000
--- a/wpilibc/src/main/native/cpp/GearTooth.cpp
+++ /dev/null
@@ -1,46 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/GearTooth.h"
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-constexpr double GearTooth::kGearToothThreshold;
-
-GearTooth::GearTooth(int channel, bool directionSensitive) : Counter(channel) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth", channel);
-}
-
-GearTooth::GearTooth(DigitalSource* source, bool directionSensitive)
-    : Counter(source) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth",
-                                          source->GetChannel());
-}
-
-GearTooth::GearTooth(std::shared_ptr<DigitalSource> source,
-                     bool directionSensitive)
-    : Counter(source) {
-  EnableDirectionSensing(directionSensitive);
-  SendableRegistry::GetInstance().SetName(this, "GearTooth",
-                                          source->GetChannel());
-}
-
-void GearTooth::EnableDirectionSensing(bool directionSensitive) {
-  if (directionSensitive) {
-    SetPulseLengthMode(kGearToothThreshold);
-  }
-}
-
-void GearTooth::InitSendable(SendableBuilder& builder) {
-  Counter::InitSendable(builder);
-  builder.SetSmartDashboardType("Gear Tooth");
-}
diff --git a/wpilibc/src/main/native/cpp/GenericHID.cpp b/wpilibc/src/main/native/cpp/GenericHID.cpp
index 4a264c8..6c186eb 100644
--- a/wpilibc/src/main/native/cpp/GenericHID.cpp
+++ b/wpilibc/src/main/native/cpp/GenericHID.cpp
@@ -1,69 +1,74 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/GenericHID.h"
 
 #include <hal/DriverStation.h>
 
 #include "frc/DriverStation.h"
-#include "frc/WPIErrors.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
-GenericHID::GenericHID(int port) : m_ds(&DriverStation::GetInstance()) {
-  if (port >= DriverStation::kJoystickPorts) {
-    wpi_setWPIError(BadJoystickIndex);
+GenericHID::GenericHID(int port) {
+  if (port < 0 || port >= DriverStation::kJoystickPorts) {
+    throw FRC_MakeError(warn::BadJoystickIndex, "port {} out of range", port);
   }
   m_port = port;
 }
 
 bool GenericHID::GetRawButton(int button) const {
-  return m_ds->GetStickButton(m_port, button);
+  return DriverStation::GetStickButton(m_port, button);
 }
 
 bool GenericHID::GetRawButtonPressed(int button) {
-  return m_ds->GetStickButtonPressed(m_port, button);
+  return DriverStation::GetStickButtonPressed(m_port, button);
 }
 
 bool GenericHID::GetRawButtonReleased(int button) {
-  return m_ds->GetStickButtonReleased(m_port, button);
+  return DriverStation::GetStickButtonReleased(m_port, button);
 }
 
 double GenericHID::GetRawAxis(int axis) const {
-  return m_ds->GetStickAxis(m_port, axis);
+  return DriverStation::GetStickAxis(m_port, axis);
 }
 
-int GenericHID::GetPOV(int pov) const { return m_ds->GetStickPOV(m_port, pov); }
+int GenericHID::GetPOV(int pov) const {
+  return DriverStation::GetStickPOV(m_port, pov);
+}
 
-int GenericHID::GetAxisCount() const { return m_ds->GetStickAxisCount(m_port); }
+int GenericHID::GetAxisCount() const {
+  return DriverStation::GetStickAxisCount(m_port);
+}
 
-int GenericHID::GetPOVCount() const { return m_ds->GetStickPOVCount(m_port); }
+int GenericHID::GetPOVCount() const {
+  return DriverStation::GetStickPOVCount(m_port);
+}
 
 int GenericHID::GetButtonCount() const {
-  return m_ds->GetStickButtonCount(m_port);
+  return DriverStation::GetStickButtonCount(m_port);
 }
 
 bool GenericHID::IsConnected() const {
-  return m_ds->IsJoystickConnected(m_port);
+  return DriverStation::IsJoystickConnected(m_port);
 }
 
 GenericHID::HIDType GenericHID::GetType() const {
-  return static_cast<HIDType>(m_ds->GetJoystickType(m_port));
+  return static_cast<HIDType>(DriverStation::GetJoystickType(m_port));
 }
 
 std::string GenericHID::GetName() const {
-  return m_ds->GetJoystickName(m_port);
+  return DriverStation::GetJoystickName(m_port);
 }
 
 int GenericHID::GetAxisType(int axis) const {
-  return m_ds->GetJoystickAxisType(m_port, axis);
+  return DriverStation::GetJoystickAxisType(m_port, axis);
 }
 
-int GenericHID::GetPort() const { return m_port; }
+int GenericHID::GetPort() const {
+  return m_port;
+}
 
 void GenericHID::SetOutput(int outputNumber, bool value) {
   m_outputs =
@@ -78,10 +83,11 @@
 }
 
 void GenericHID::SetRumble(RumbleType type, double value) {
-  if (value < 0)
+  if (value < 0) {
     value = 0;
-  else if (value > 1)
+  } else if (value > 1) {
     value = 1;
+  }
   if (type == kLeftRumble) {
     m_leftRumble = value * 65535;
   } else {
diff --git a/wpilibc/src/main/native/cpp/GyroBase.cpp b/wpilibc/src/main/native/cpp/GyroBase.cpp
deleted file mode 100644
index ba9b2f0..0000000
--- a/wpilibc/src/main/native/cpp/GyroBase.cpp
+++ /dev/null
@@ -1,30 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/GyroBase.h"
-
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-
-using namespace frc;
-
-double GyroBase::PIDGet() {
-  switch (GetPIDSourceType()) {
-    case PIDSourceType::kRate:
-      return GetRate();
-    case PIDSourceType::kDisplacement:
-      return GetAngle();
-    default:
-      return 0;
-  }
-}
-
-void GyroBase::InitSendable(SendableBuilder& builder) {
-  builder.SetSmartDashboardType("Gyro");
-  builder.AddDoubleProperty(
-      "Value", [=]() { return GetAngle(); }, nullptr);
-}
diff --git a/wpilibc/src/main/native/cpp/I2C.cpp b/wpilibc/src/main/native/cpp/I2C.cpp
index 21d92f2..adf1c54 100644
--- a/wpilibc/src/main/native/cpp/I2C.cpp
+++ b/wpilibc/src/main/native/cpp/I2C.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/I2C.h"
 
@@ -12,7 +9,7 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/I2C.h>
 
-#include "frc/WPIErrors.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -20,23 +17,34 @@
     : m_port(static_cast<HAL_I2CPort>(port)), m_deviceAddress(deviceAddress) {
   int32_t status = 0;
   HAL_InitializeI2C(m_port, &status);
-  // wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", port);
 
   HAL_Report(HALUsageReporting::kResourceType_I2C, deviceAddress);
 }
 
-I2C::~I2C() { HAL_CloseI2C(m_port); }
+I2C::~I2C() {
+  HAL_CloseI2C(m_port);
+}
+
+I2C::Port I2C::GetPort() const {
+  return static_cast<Port>(static_cast<int>(m_port));
+}
+
+int I2C::GetDeviceAddress() const {
+  return m_deviceAddress;
+}
 
 bool I2C::Transaction(uint8_t* dataToSend, int sendSize, uint8_t* dataReceived,
                       int receiveSize) {
   int32_t status = 0;
   status = HAL_TransactionI2C(m_port, m_deviceAddress, dataToSend, sendSize,
                               dataReceived, receiveSize);
-  // wpi_setHALError(status);
   return status < 0;
 }
 
-bool I2C::AddressOnly() { return Transaction(nullptr, 0, nullptr, 0); }
+bool I2C::AddressOnly() {
+  return Transaction(nullptr, 0, nullptr, 0);
+}
 
 bool I2C::Write(int registerAddress, uint8_t data) {
   uint8_t buffer[2];
@@ -55,12 +63,10 @@
 
 bool I2C::Read(int registerAddress, int count, uint8_t* buffer) {
   if (count < 1) {
-    wpi_setWPIErrorWithContext(ParameterOutOfRange, "count");
-    return true;
+    throw FRC_MakeError(err::ParameterOutOfRange, "count {}", count);
   }
-  if (buffer == nullptr) {
-    wpi_setWPIErrorWithContext(NullParameter, "buffer");
-    return true;
+  if (!buffer) {
+    throw FRC_MakeError(err::NullParameter, "{}", "buffer");
   }
   uint8_t regAddr = registerAddress;
   return Transaction(&regAddr, sizeof(regAddr), buffer, count);
@@ -68,12 +74,10 @@
 
 bool I2C::ReadOnly(int count, uint8_t* buffer) {
   if (count < 1) {
-    wpi_setWPIErrorWithContext(ParameterOutOfRange, "count");
-    return true;
+    throw FRC_MakeError(err::ParameterOutOfRange, "count {}", count);
   }
-  if (buffer == nullptr) {
-    wpi_setWPIErrorWithContext(NullParameter, "buffer");
-    return true;
+  if (!buffer) {
+    throw FRC_MakeError(err::NullParameter, "{}", "buffer");
   }
   return HAL_ReadI2C(m_port, m_deviceAddress, buffer, count) < 0;
 }
@@ -86,10 +90,14 @@
        i += 4, curRegisterAddress += 4) {
     int toRead = count - i < 4 ? count - i : 4;
     // Read the chunk of data.  Return false if the sensor does not respond.
-    if (Read(curRegisterAddress, toRead, deviceData)) return false;
+    if (Read(curRegisterAddress, toRead, deviceData)) {
+      return false;
+    }
 
     for (int j = 0; j < toRead; j++) {
-      if (deviceData[j] != expected[i + j]) return false;
+      if (deviceData[j] != expected[i + j]) {
+        return false;
+      }
     }
   }
   return true;
diff --git a/wpilibc/src/main/native/cpp/InterruptableSensorBase.cpp b/wpilibc/src/main/native/cpp/InterruptableSensorBase.cpp
deleted file mode 100644
index 744e349..0000000
--- a/wpilibc/src/main/native/cpp/InterruptableSensorBase.cpp
+++ /dev/null
@@ -1,174 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/InterruptableSensorBase.h"
-
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
-
-using namespace frc;
-
-InterruptableSensorBase::~InterruptableSensorBase() {
-  if (m_interrupt == HAL_kInvalidHandle) return;
-  int32_t status = 0;
-  HAL_CleanInterrupts(m_interrupt, &status);
-  // Ignore status, as an invalid handle just needs to be ignored.
-}
-
-void InterruptableSensorBase::RequestInterrupts(
-    HAL_InterruptHandlerFunction handler, void* param) {
-  if (StatusIsFatal()) return;
-
-  wpi_assert(m_interrupt == HAL_kInvalidHandle);
-  AllocateInterrupts(false);
-  if (StatusIsFatal()) return;  // if allocate failed, out of interrupts
-
-  int32_t status = 0;
-  HAL_RequestInterrupts(
-      m_interrupt, GetPortHandleForRouting(),
-      static_cast<HAL_AnalogTriggerType>(GetAnalogTriggerTypeForRouting()),
-      &status);
-  SetUpSourceEdge(true, false);
-  HAL_AttachInterruptHandler(m_interrupt, handler, param, &status);
-  wpi_setHALError(status);
-}
-
-void InterruptableSensorBase::RequestInterrupts(InterruptEventHandler handler) {
-  if (StatusIsFatal()) return;
-
-  wpi_assert(m_interrupt == HAL_kInvalidHandle);
-  AllocateInterrupts(false);
-  if (StatusIsFatal()) return;  // if allocate failed, out of interrupts
-
-  m_interruptHandler =
-      std::make_unique<InterruptEventHandler>(std::move(handler));
-
-  int32_t status = 0;
-  HAL_RequestInterrupts(
-      m_interrupt, GetPortHandleForRouting(),
-      static_cast<HAL_AnalogTriggerType>(GetAnalogTriggerTypeForRouting()),
-      &status);
-  SetUpSourceEdge(true, false);
-  HAL_AttachInterruptHandler(
-      m_interrupt,
-      [](uint32_t mask, void* param) {
-        auto self = reinterpret_cast<InterruptEventHandler*>(param);
-        // Rising edge result is the interrupt bit set in the byte 0xFF
-        // Falling edge result is the interrupt bit set in the byte 0xFF00
-        // Set any bit set to be true for that edge, and AND the 2 results
-        // together to match the existing enum for all interrupts
-        int32_t rising = (mask & 0xFF) ? 0x1 : 0x0;
-        int32_t falling = ((mask & 0xFF00) ? 0x0100 : 0x0);
-        WaitResult res = static_cast<WaitResult>(falling | rising);
-        (*self)(res);
-      },
-      m_interruptHandler.get(), &status);
-  wpi_setHALError(status);
-}
-
-void InterruptableSensorBase::RequestInterrupts() {
-  if (StatusIsFatal()) return;
-
-  wpi_assert(m_interrupt == HAL_kInvalidHandle);
-  AllocateInterrupts(true);
-  if (StatusIsFatal()) return;  // if allocate failed, out of interrupts
-
-  int32_t status = 0;
-  HAL_RequestInterrupts(
-      m_interrupt, GetPortHandleForRouting(),
-      static_cast<HAL_AnalogTriggerType>(GetAnalogTriggerTypeForRouting()),
-      &status);
-  wpi_setHALError(status);
-  SetUpSourceEdge(true, false);
-}
-
-void InterruptableSensorBase::CancelInterrupts() {
-  if (StatusIsFatal()) return;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  HAL_CleanInterrupts(m_interrupt, &status);
-  // Ignore status, as an invalid handle just needs to be ignored.
-  m_interrupt = HAL_kInvalidHandle;
-  m_interruptHandler = nullptr;
-}
-
-InterruptableSensorBase::WaitResult InterruptableSensorBase::WaitForInterrupt(
-    double timeout, bool ignorePrevious) {
-  if (StatusIsFatal()) return InterruptableSensorBase::kTimeout;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  int result;
-
-  result = HAL_WaitForInterrupt(m_interrupt, timeout, ignorePrevious, &status);
-  wpi_setHALError(status);
-
-  // Rising edge result is the interrupt bit set in the byte 0xFF
-  // Falling edge result is the interrupt bit set in the byte 0xFF00
-  // Set any bit set to be true for that edge, and AND the 2 results
-  // together to match the existing enum for all interrupts
-  int32_t rising = (result & 0xFF) ? 0x1 : 0x0;
-  int32_t falling = ((result & 0xFF00) ? 0x0100 : 0x0);
-  return static_cast<WaitResult>(falling | rising);
-}
-
-void InterruptableSensorBase::EnableInterrupts() {
-  if (StatusIsFatal()) return;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  HAL_EnableInterrupts(m_interrupt, &status);
-  wpi_setHALError(status);
-}
-
-void InterruptableSensorBase::DisableInterrupts() {
-  if (StatusIsFatal()) return;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  HAL_DisableInterrupts(m_interrupt, &status);
-  wpi_setHALError(status);
-}
-
-double InterruptableSensorBase::ReadRisingTimestamp() {
-  if (StatusIsFatal()) return 0.0;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  int64_t timestamp = HAL_ReadInterruptRisingTimestamp(m_interrupt, &status);
-  wpi_setHALError(status);
-  return timestamp * 1e-6;
-}
-
-double InterruptableSensorBase::ReadFallingTimestamp() {
-  if (StatusIsFatal()) return 0.0;
-  wpi_assert(m_interrupt != HAL_kInvalidHandle);
-  int32_t status = 0;
-  int64_t timestamp = HAL_ReadInterruptFallingTimestamp(m_interrupt, &status);
-  wpi_setHALError(status);
-  return timestamp * 1e-6;
-}
-
-void InterruptableSensorBase::SetUpSourceEdge(bool risingEdge,
-                                              bool fallingEdge) {
-  if (StatusIsFatal()) return;
-  if (m_interrupt == HAL_kInvalidHandle) {
-    wpi_setWPIErrorWithContext(
-        NullParameter,
-        "You must call RequestInterrupts before SetUpSourceEdge");
-    return;
-  }
-  if (m_interrupt != HAL_kInvalidHandle) {
-    int32_t status = 0;
-    HAL_SetInterruptUpSourceEdge(m_interrupt, risingEdge, fallingEdge, &status);
-    wpi_setHALError(status);
-  }
-}
-
-void InterruptableSensorBase::AllocateInterrupts(bool watcher) {
-  wpi_assert(m_interrupt == HAL_kInvalidHandle);
-  // Expects the calling leaf class to allocate an interrupt index.
-  int32_t status = 0;
-  m_interrupt = HAL_InitializeInterrupts(watcher, &status);
-  wpi_setHALError(status);
-}
diff --git a/wpilibc/src/main/native/cpp/IterativeRobot.cpp b/wpilibc/src/main/native/cpp/IterativeRobot.cpp
deleted file mode 100644
index 72fb79b..0000000
--- a/wpilibc/src/main/native/cpp/IterativeRobot.cpp
+++ /dev/null
@@ -1,47 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/IterativeRobot.h"
-
-#include <hal/DriverStation.h>
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/DriverStation.h"
-
-using namespace frc;
-
-static constexpr auto kPacketPeriod = 0.02_s;
-
-IterativeRobot::IterativeRobot() : IterativeRobotBase(kPacketPeriod) {
-  HAL_Report(HALUsageReporting::kResourceType_Framework,
-             HALUsageReporting::kFramework_Iterative);
-}
-
-void IterativeRobot::StartCompetition() {
-  RobotInit();
-
-  if constexpr (IsSimulation()) {
-    SimulationInit();
-  }
-
-  // Tell the DS that the robot is ready to be enabled
-  HAL_ObserveUserProgramStarting();
-
-  // Loop forever, calling the appropriate mode-dependent function
-  while (true) {
-    // Wait for driver station data so the loop doesn't hog the CPU
-    DriverStation::GetInstance().WaitForData();
-    if (m_exit) break;
-
-    LoopFunc();
-  }
-}
-
-void IterativeRobot::EndCompetition() {
-  m_exit = true;
-  DriverStation::GetInstance().WakeupWaitForData();
-}
diff --git a/wpilibc/src/main/native/cpp/IterativeRobotBase.cpp b/wpilibc/src/main/native/cpp/IterativeRobotBase.cpp
index 7b29130..47eb299 100644
--- a/wpilibc/src/main/native/cpp/IterativeRobotBase.cpp
+++ b/wpilibc/src/main/native/cpp/IterativeRobotBase.cpp
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/IterativeRobotBase.h"
 
+#include <fmt/format.h>
 #include <hal/DriverStation.h>
-#include <wpi/Format.h>
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
+#include <networktables/NetworkTableInstance.h>
 
-#include "frc/DriverStation.h"
+#include "frc/DSControlWord.h"
+#include "frc/Errors.h"
 #include "frc/livewindow/LiveWindow.h"
 #include "frc/shuffleboard/Shuffleboard.h"
 #include "frc/smartdashboard/SmartDashboard.h"
@@ -26,34 +23,22 @@
     : m_period(period),
       m_watchdog(period, [this] { PrintLoopOverrunMessage(); }) {}
 
-void IterativeRobotBase::RobotInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::RobotInit() {}
 
-void IterativeRobotBase::SimulationInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::SimulationInit() {}
 
-void IterativeRobotBase::DisabledInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::DisabledInit() {}
 
-void IterativeRobotBase::AutonomousInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::AutonomousInit() {}
 
-void IterativeRobotBase::TeleopInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::TeleopInit() {}
 
-void IterativeRobotBase::TestInit() {
-  wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
-}
+void IterativeRobotBase::TestInit() {}
 
 void IterativeRobotBase::RobotPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
@@ -61,7 +46,7 @@
 void IterativeRobotBase::SimulationPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
@@ -69,7 +54,7 @@
 void IterativeRobotBase::DisabledPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
@@ -77,7 +62,7 @@
 void IterativeRobotBase::AutonomousPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
@@ -85,7 +70,7 @@
 void IterativeRobotBase::TeleopPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
@@ -93,68 +78,92 @@
 void IterativeRobotBase::TestPeriodic() {
   static bool firstRun = true;
   if (firstRun) {
-    wpi::outs() << "Default " << __FUNCTION__ << "() method... Override me!\n";
+    fmt::print("Default {}() method... Override me!\n", __FUNCTION__);
     firstRun = false;
   }
 }
 
+void IterativeRobotBase::DisabledExit() {}
+
+void IterativeRobotBase::AutonomousExit() {}
+
+void IterativeRobotBase::TeleopExit() {}
+
+void IterativeRobotBase::TestExit() {}
+
+void IterativeRobotBase::SetNetworkTablesFlushEnabled(bool enabled) {
+  m_ntFlushEnabled = enabled;
+}
+
+units::second_t IterativeRobotBase::GetPeriod() const {
+  return m_period;
+}
+
 void IterativeRobotBase::LoopFunc() {
   m_watchdog.Reset();
 
-  // Call the appropriate function depending upon the current robot mode
-  if (IsDisabled()) {
-    // Call DisabledInit() if we are now just entering disabled mode from
-    // either a different mode or from power-on.
-    if (m_lastMode != Mode::kDisabled) {
-      LiveWindow::GetInstance()->SetEnabled(false);
+  // Get current mode
+  DSControlWord word;
+  Mode mode = Mode::kNone;
+  if (word.IsDisabled()) {
+    mode = Mode::kDisabled;
+  } else if (word.IsAutonomous()) {
+    mode = Mode::kAutonomous;
+  } else if (word.IsTeleop()) {
+    mode = Mode::kTeleop;
+  } else if (word.IsTest()) {
+    mode = Mode::kTest;
+  }
+
+  // If mode changed, call mode exit and entry functions
+  if (m_lastMode != mode) {
+    // Call last mode's exit function
+    if (m_lastMode == Mode::kDisabled) {
+      DisabledExit();
+    } else if (m_lastMode == Mode::kAutonomous) {
+      AutonomousExit();
+    } else if (m_lastMode == Mode::kTeleop) {
+      TeleopExit();
+    } else if (m_lastMode == Mode::kTest) {
+      LiveWindow::SetEnabled(false);
       Shuffleboard::DisableActuatorWidgets();
+      TestExit();
+    }
+
+    // Call current mode's entry function
+    if (mode == Mode::kDisabled) {
       DisabledInit();
       m_watchdog.AddEpoch("DisabledInit()");
-      m_lastMode = Mode::kDisabled;
-    }
-
-    HAL_ObserveUserProgramDisabled();
-    DisabledPeriodic();
-    m_watchdog.AddEpoch("DisabledPeriodic()");
-  } else if (IsAutonomous()) {
-    // Call AutonomousInit() if we are now just entering autonomous mode from
-    // either a different mode or from power-on.
-    if (m_lastMode != Mode::kAutonomous) {
-      LiveWindow::GetInstance()->SetEnabled(false);
-      Shuffleboard::DisableActuatorWidgets();
+    } else if (mode == Mode::kAutonomous) {
       AutonomousInit();
       m_watchdog.AddEpoch("AutonomousInit()");
-      m_lastMode = Mode::kAutonomous;
-    }
-
-    HAL_ObserveUserProgramAutonomous();
-    AutonomousPeriodic();
-    m_watchdog.AddEpoch("AutonomousPeriodic()");
-  } else if (IsOperatorControl()) {
-    // Call TeleopInit() if we are now just entering teleop mode from
-    // either a different mode or from power-on.
-    if (m_lastMode != Mode::kTeleop) {
-      LiveWindow::GetInstance()->SetEnabled(false);
-      Shuffleboard::DisableActuatorWidgets();
+    } else if (mode == Mode::kTeleop) {
       TeleopInit();
       m_watchdog.AddEpoch("TeleopInit()");
-      m_lastMode = Mode::kTeleop;
-    }
-
-    HAL_ObserveUserProgramTeleop();
-    TeleopPeriodic();
-    m_watchdog.AddEpoch("TeleopPeriodic()");
-  } else {
-    // Call TestInit() if we are now just entering test mode from
-    // either a different mode or from power-on.
-    if (m_lastMode != Mode::kTest) {
-      LiveWindow::GetInstance()->SetEnabled(true);
+    } else if (mode == Mode::kTest) {
+      LiveWindow::SetEnabled(true);
       Shuffleboard::EnableActuatorWidgets();
       TestInit();
       m_watchdog.AddEpoch("TestInit()");
-      m_lastMode = Mode::kTest;
     }
 
+    m_lastMode = mode;
+  }
+
+  // Call the appropriate function depending upon the current robot mode
+  if (mode == Mode::kDisabled) {
+    HAL_ObserveUserProgramDisabled();
+    DisabledPeriodic();
+    m_watchdog.AddEpoch("DisabledPeriodic()");
+  } else if (mode == Mode::kAutonomous) {
+    HAL_ObserveUserProgramAutonomous();
+    AutonomousPeriodic();
+    m_watchdog.AddEpoch("AutonomousPeriodic()");
+  } else if (mode == Mode::kTeleop) {
+    HAL_ObserveUserProgramTeleop();
+    TeleopPeriodic();
+    m_watchdog.AddEpoch("TeleopPeriodic()");
+  } else if (mode == Mode::kTest) {
     HAL_ObserveUserProgramTest();
     TestPeriodic();
     m_watchdog.AddEpoch("TestPeriodic()");
@@ -165,18 +174,25 @@
 
   SmartDashboard::UpdateValues();
   m_watchdog.AddEpoch("SmartDashboard::UpdateValues()");
-  LiveWindow::GetInstance()->UpdateValues();
+  LiveWindow::UpdateValues();
   m_watchdog.AddEpoch("LiveWindow::UpdateValues()");
   Shuffleboard::Update();
   m_watchdog.AddEpoch("Shuffleboard::Update()");
 
   if constexpr (IsSimulation()) {
+    HAL_SimPeriodicBefore();
     SimulationPeriodic();
+    HAL_SimPeriodicAfter();
     m_watchdog.AddEpoch("SimulationPeriodic()");
   }
 
   m_watchdog.Disable();
 
+  // Flush NetworkTables
+  if (m_ntFlushEnabled) {
+    nt::NetworkTableInstance::GetDefault().Flush();
+  }
+
   // Warn on loop time overruns
   if (m_watchdog.IsExpired()) {
     m_watchdog.PrintEpochs();
@@ -184,11 +200,5 @@
 }
 
 void IterativeRobotBase::PrintLoopOverrunMessage() {
-  wpi::SmallString<128> str;
-  wpi::raw_svector_ostream buf(str);
-
-  buf << "Loop time of " << wpi::format("%.6f", m_period.to<double>())
-      << "s overrun\n";
-
-  DriverStation::ReportWarning(str);
+  FRC_ReportError(err::Error, "Loop time of {:.6f}s overrun", m_period.value());
 }
diff --git a/wpilibc/src/main/native/cpp/Jaguar.cpp b/wpilibc/src/main/native/cpp/Jaguar.cpp
deleted file mode 100644
index c87e4d1..0000000
--- a/wpilibc/src/main/native/cpp/Jaguar.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Jaguar.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-Jaguar::Jaguar(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.31, 1.55, 1.507, 1.454, 0.697);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_Jaguar, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "Jaguar", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/Joystick.cpp b/wpilibc/src/main/native/cpp/Joystick.cpp
index c2cdaea..48f0c77 100644
--- a/wpilibc/src/main/native/cpp/Joystick.cpp
+++ b/wpilibc/src/main/native/cpp/Joystick.cpp
@@ -1,16 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Joystick.h"
 
 #include <cmath>
 
 #include <hal/FRCUsageReporting.h>
-#include <wpi/math>
+#include <wpi/numbers>
 
 using namespace frc;
 
@@ -24,45 +21,69 @@
   HAL_Report(HALUsageReporting::kResourceType_Joystick, port + 1);
 }
 
-void Joystick::SetXChannel(int channel) { m_axes[Axis::kX] = channel; }
+void Joystick::SetXChannel(int channel) {
+  m_axes[Axis::kX] = channel;
+}
 
-void Joystick::SetYChannel(int channel) { m_axes[Axis::kY] = channel; }
+void Joystick::SetYChannel(int channel) {
+  m_axes[Axis::kY] = channel;
+}
 
-void Joystick::SetZChannel(int channel) { m_axes[Axis::kZ] = channel; }
+void Joystick::SetZChannel(int channel) {
+  m_axes[Axis::kZ] = channel;
+}
 
-void Joystick::SetTwistChannel(int channel) { m_axes[Axis::kTwist] = channel; }
+void Joystick::SetTwistChannel(int channel) {
+  m_axes[Axis::kTwist] = channel;
+}
 
 void Joystick::SetThrottleChannel(int channel) {
   m_axes[Axis::kThrottle] = channel;
 }
 
-int Joystick::GetXChannel() const { return m_axes[Axis::kX]; }
+int Joystick::GetXChannel() const {
+  return m_axes[Axis::kX];
+}
 
-int Joystick::GetYChannel() const { return m_axes[Axis::kY]; }
+int Joystick::GetYChannel() const {
+  return m_axes[Axis::kY];
+}
 
-int Joystick::GetZChannel() const { return m_axes[Axis::kZ]; }
+int Joystick::GetZChannel() const {
+  return m_axes[Axis::kZ];
+}
 
-int Joystick::GetTwistChannel() const { return m_axes[Axis::kTwist]; }
+int Joystick::GetTwistChannel() const {
+  return m_axes[Axis::kTwist];
+}
 
-int Joystick::GetThrottleChannel() const { return m_axes[Axis::kThrottle]; }
+int Joystick::GetThrottleChannel() const {
+  return m_axes[Axis::kThrottle];
+}
 
-double Joystick::GetX(JoystickHand hand) const {
+double Joystick::GetX() const {
   return GetRawAxis(m_axes[Axis::kX]);
 }
 
-double Joystick::GetY(JoystickHand hand) const {
+double Joystick::GetY() const {
   return GetRawAxis(m_axes[Axis::kY]);
 }
 
-double Joystick::GetZ() const { return GetRawAxis(m_axes[Axis::kZ]); }
+double Joystick::GetZ() const {
+  return GetRawAxis(m_axes[Axis::kZ]);
+}
 
-double Joystick::GetTwist() const { return GetRawAxis(m_axes[Axis::kTwist]); }
+double Joystick::GetTwist() const {
+  return GetRawAxis(m_axes[Axis::kTwist]);
+}
 
 double Joystick::GetThrottle() const {
   return GetRawAxis(m_axes[Axis::kThrottle]);
 }
 
-bool Joystick::GetTrigger() const { return GetRawButton(Button::kTrigger); }
+bool Joystick::GetTrigger() const {
+  return GetRawButton(Button::kTrigger);
+}
 
 bool Joystick::GetTriggerPressed() {
   return GetRawButtonPressed(Button::kTrigger);
@@ -72,11 +93,17 @@
   return GetRawButtonReleased(Button::kTrigger);
 }
 
-bool Joystick::GetTop() const { return GetRawButton(Button::kTop); }
+bool Joystick::GetTop() const {
+  return GetRawButton(Button::kTop);
+}
 
-bool Joystick::GetTopPressed() { return GetRawButtonPressed(Button::kTop); }
+bool Joystick::GetTopPressed() {
+  return GetRawButtonPressed(Button::kTop);
+}
 
-bool Joystick::GetTopReleased() { return GetRawButtonReleased(Button::kTop); }
+bool Joystick::GetTopReleased() {
+  return GetRawButtonReleased(Button::kTop);
+}
 
 double Joystick::GetMagnitude() const {
   return std::sqrt(std::pow(GetX(), 2) + std::pow(GetY(), 2));
@@ -87,5 +114,5 @@
 }
 
 double Joystick::GetDirectionDegrees() const {
-  return (180 / wpi::math::pi) * GetDirectionRadians();
+  return (180 / wpi::numbers::pi) * GetDirectionRadians();
 }
diff --git a/wpilibc/src/main/native/cpp/MotorSafety.cpp b/wpilibc/src/main/native/cpp/MotorSafety.cpp
index 1806e86..9cb28cd 100644
--- a/wpilibc/src/main/native/cpp/MotorSafety.cpp
+++ b/wpilibc/src/main/native/cpp/MotorSafety.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/MotorSafety.h"
 
@@ -11,11 +8,9 @@
 #include <utility>
 
 #include <wpi/SmallPtrSet.h>
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
 
 #include "frc/DriverStation.h"
-#include "frc/WPIErrors.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -33,16 +28,13 @@
 }
 
 MotorSafety::MotorSafety(MotorSafety&& rhs)
-    : ErrorBase(std::move(rhs)),
-      m_expiration(std::move(rhs.m_expiration)),
+    : m_expiration(std::move(rhs.m_expiration)),
       m_enabled(std::move(rhs.m_enabled)),
       m_stopTime(std::move(rhs.m_stopTime)) {}
 
 MotorSafety& MotorSafety::operator=(MotorSafety&& rhs) {
   std::scoped_lock lock(m_thisMutex, rhs.m_thisMutex);
 
-  ErrorBase::operator=(std::move(rhs));
-
   m_expiration = std::move(rhs.m_expiration);
   m_enabled = std::move(rhs.m_enabled);
   m_stopTime = std::move(rhs.m_stopTime);
@@ -55,12 +47,12 @@
   m_stopTime = Timer::GetFPGATimestamp() + m_expiration;
 }
 
-void MotorSafety::SetExpiration(double expirationTime) {
+void MotorSafety::SetExpiration(units::second_t expirationTime) {
   std::scoped_lock lock(m_thisMutex);
   m_expiration = expirationTime;
 }
 
-double MotorSafety::GetExpiration() const {
+units::second_t MotorSafety::GetExpiration() const {
   std::scoped_lock lock(m_thisMutex);
   return m_expiration;
 }
@@ -82,7 +74,7 @@
 
 void MotorSafety::Check() {
   bool enabled;
-  double stopTime;
+  units::second_t stopTime;
 
   {
     std::scoped_lock lock(m_thisMutex);
@@ -90,17 +82,13 @@
     stopTime = m_stopTime;
   }
 
-  DriverStation& ds = DriverStation::GetInstance();
-  if (!enabled || ds.IsDisabled() || ds.IsTest()) {
+  if (!enabled || DriverStation::IsDisabled() || DriverStation::IsTest()) {
     return;
   }
 
   if (stopTime < Timer::GetFPGATimestamp()) {
-    wpi::SmallString<128> buf;
-    wpi::raw_svector_ostream desc(buf);
-    GetDescription(desc);
-    desc << "... Output not updated often enough.";
-    wpi_setWPIErrorWithContext(Timeout, desc.str());
+    FRC_ReportError(err::Timeout, "{}... Output not updated often enough",
+                    GetDescription());
     StopMotor();
   }
 }
diff --git a/wpilibc/src/main/native/cpp/NidecBrushless.cpp b/wpilibc/src/main/native/cpp/NidecBrushless.cpp
deleted file mode 100644
index 82a278e..0000000
--- a/wpilibc/src/main/native/cpp/NidecBrushless.cpp
+++ /dev/null
@@ -1,75 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/NidecBrushless.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-NidecBrushless::NidecBrushless(int pwmChannel, int dioChannel)
-    : m_dio(dioChannel), m_pwm(pwmChannel) {
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, &m_dio);
-  registry.AddChild(this, &m_pwm);
-  SetExpiration(0.0);
-  SetSafetyEnabled(false);
-
-  // the dio controls the output (in PWM mode)
-  m_dio.SetPWMRate(15625);
-  m_dio.EnablePWM(0.5);
-
-  HAL_Report(HALUsageReporting::kResourceType_NidecBrushless, pwmChannel + 1);
-  registry.AddLW(this, "Nidec Brushless", pwmChannel);
-}
-
-void NidecBrushless::Set(double speed) {
-  if (!m_disabled) {
-    m_speed = speed;
-    m_dio.UpdateDutyCycle(0.5 + 0.5 * (m_isInverted ? -speed : speed));
-    m_pwm.SetRaw(0xffff);
-  }
-  Feed();
-}
-
-double NidecBrushless::Get() const { return m_speed; }
-
-void NidecBrushless::SetInverted(bool isInverted) { m_isInverted = isInverted; }
-
-bool NidecBrushless::GetInverted() const { return m_isInverted; }
-
-void NidecBrushless::Disable() {
-  m_disabled = true;
-  m_dio.UpdateDutyCycle(0.5);
-  m_pwm.SetDisabled();
-}
-
-void NidecBrushless::Enable() { m_disabled = false; }
-
-void NidecBrushless::PIDWrite(double output) { Set(output); }
-
-void NidecBrushless::StopMotor() {
-  m_dio.UpdateDutyCycle(0.5);
-  m_pwm.SetDisabled();
-}
-
-void NidecBrushless::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "Nidec " << GetChannel();
-}
-
-int NidecBrushless::GetChannel() const { return m_pwm.GetChannel(); }
-
-void NidecBrushless::InitSendable(SendableBuilder& builder) {
-  builder.SetSmartDashboardType("Nidec Brushless");
-  builder.SetActuator(true);
-  builder.SetSafeState([=]() { StopMotor(); });
-  builder.AddDoubleProperty(
-      "Value", [=]() { return Get(); }, [=](double value) { Set(value); });
-}
diff --git a/wpilibc/src/main/native/cpp/Notifier.cpp b/wpilibc/src/main/native/cpp/Notifier.cpp
index 4280ce4..441f750 100644
--- a/wpilibc/src/main/native/cpp/Notifier.cpp
+++ b/wpilibc/src/main/native/cpp/Notifier.cpp
@@ -1,40 +1,41 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Notifier.h"
 
 #include <utility>
 
+#include <fmt/format.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/Notifier.h>
 #include <hal/Threads.h>
-#include <wpi/SmallString.h>
 
+#include "frc/Errors.h"
 #include "frc/Timer.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
 
 using namespace frc;
 
 Notifier::Notifier(std::function<void()> handler) {
-  if (handler == nullptr)
-    wpi_setWPIErrorWithContext(NullParameter, "handler must not be nullptr");
+  if (!handler) {
+    throw FRC_MakeError(err::NullParameter, "{}", "handler");
+  }
   m_handler = handler;
   int32_t status = 0;
   m_notifier = HAL_InitializeNotifier(&status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "InitializeNotifier");
 
   m_thread = std::thread([=] {
     for (;;) {
       int32_t status = 0;
       HAL_NotifierHandle notifier = m_notifier.load();
-      if (notifier == 0) break;
+      if (notifier == 0) {
+        break;
+      }
       uint64_t curTime = HAL_WaitForNotifierAlarm(notifier, &status);
-      if (curTime == 0 || status != 0) break;
+      if (curTime == 0 || status != 0) {
+        break;
+      }
 
       std::function<void()> handler;
       {
@@ -50,27 +51,34 @@
       }
 
       // call callback
-      if (handler) handler();
+      if (handler) {
+        handler();
+      }
     }
   });
 }
 
 Notifier::Notifier(int priority, std::function<void()> handler) {
-  if (handler == nullptr)
-    wpi_setWPIErrorWithContext(NullParameter, "handler must not be nullptr");
+  if (!handler) {
+    throw FRC_MakeError(err::NullParameter, "{}", "handler");
+  }
   m_handler = handler;
   int32_t status = 0;
   m_notifier = HAL_InitializeNotifier(&status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "InitializeNotifier");
 
   m_thread = std::thread([=] {
     int32_t status = 0;
     HAL_SetCurrentThreadPriority(true, priority, &status);
     for (;;) {
       HAL_NotifierHandle notifier = m_notifier.load();
-      if (notifier == 0) break;
+      if (notifier == 0) {
+        break;
+      }
       uint64_t curTime = HAL_WaitForNotifierAlarm(notifier, &status);
-      if (curTime == 0 || status != 0) break;
+      if (curTime == 0 || status != 0) {
+        break;
+      }
 
       std::function<void()> handler;
       {
@@ -86,7 +94,9 @@
       }
 
       // call callback
-      if (handler) handler();
+      if (handler) {
+        handler();
+      }
     }
   });
 }
@@ -96,17 +106,18 @@
   // atomically set handle to 0, then clean
   HAL_NotifierHandle handle = m_notifier.exchange(0);
   HAL_StopNotifier(handle, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "{}", "StopNotifier");
 
   // Join the thread to ensure the handler has exited.
-  if (m_thread.joinable()) m_thread.join();
+  if (m_thread.joinable()) {
+    m_thread.join();
+  }
 
   HAL_CleanNotifier(handle, &status);
 }
 
 Notifier::Notifier(Notifier&& rhs)
-    : ErrorBase(std::move(rhs)),
-      m_thread(std::move(rhs.m_thread)),
+    : m_thread(std::move(rhs.m_thread)),
       m_notifier(rhs.m_notifier.load()),
       m_handler(std::move(rhs.m_handler)),
       m_expirationTime(std::move(rhs.m_expirationTime)),
@@ -116,8 +127,6 @@
 }
 
 Notifier& Notifier::operator=(Notifier&& rhs) {
-  ErrorBase::operator=(std::move(rhs));
-
   m_thread = std::move(rhs.m_thread);
   m_notifier = rhs.m_notifier.load();
   rhs.m_notifier = HAL_kInvalidHandle;
@@ -129,11 +138,12 @@
   return *this;
 }
 
-void Notifier::SetName(const wpi::Twine& name) {
-  wpi::SmallString<64> nameBuf;
+void Notifier::SetName(std::string_view name) {
+  fmt::memory_buffer buf;
+  fmt::format_to(fmt::appender{buf}, "{}", name);
+  buf.push_back('\0');  // null terminate
   int32_t status = 0;
-  HAL_SetNotifierName(m_notifier,
-                      name.toNullTerminatedStringRef(nameBuf).data(), &status);
+  HAL_SetNotifierName(m_notifier, buf.data(), &status);
 }
 
 void Notifier::SetHandler(std::function<void()> handler) {
@@ -141,26 +151,18 @@
   m_handler = handler;
 }
 
-void Notifier::StartSingle(double delay) {
-  StartSingle(units::second_t(delay));
-}
-
 void Notifier::StartSingle(units::second_t delay) {
   std::scoped_lock lock(m_processMutex);
   m_periodic = false;
-  m_period = delay.to<double>();
+  m_period = delay;
   m_expirationTime = Timer::GetFPGATimestamp() + m_period;
   UpdateAlarm();
 }
 
-void Notifier::StartPeriodic(double period) {
-  StartPeriodic(units::second_t(period));
-}
-
 void Notifier::StartPeriodic(units::second_t period) {
   std::scoped_lock lock(m_processMutex);
   m_periodic = true;
-  m_period = period.to<double>();
+  m_period = period;
   m_expirationTime = Timer::GetFPGATimestamp() + m_period;
   UpdateAlarm();
 }
@@ -170,18 +172,25 @@
   m_periodic = false;
   int32_t status = 0;
   HAL_CancelNotifierAlarm(m_notifier, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "CancelNotifierAlarm");
 }
 
 void Notifier::UpdateAlarm(uint64_t triggerTime) {
   int32_t status = 0;
   // Return if we are being destructed, or were not created successfully
   auto notifier = m_notifier.load();
-  if (notifier == 0) return;
+  if (notifier == 0) {
+    return;
+  }
   HAL_UpdateNotifierAlarm(notifier, triggerTime, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "UpdateNotifierAlarm");
 }
 
 void Notifier::UpdateAlarm() {
   UpdateAlarm(static_cast<uint64_t>(m_expirationTime * 1e6));
 }
+
+bool Notifier::SetHALThreadPriority(bool realTime, int32_t priority) {
+  int32_t status = 0;
+  return HAL_SetNotifierThreadPriority(realTime, priority, &status);
+}
diff --git a/wpilibc/src/main/native/cpp/PIDBase.cpp b/wpilibc/src/main/native/cpp/PIDBase.cpp
deleted file mode 100644
index 5802d98..0000000
--- a/wpilibc/src/main/native/cpp/PIDBase.cpp
+++ /dev/null
@@ -1,354 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PIDBase.h"
-
-#include <algorithm>
-#include <cmath>
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/PIDOutput.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-template <class T>
-constexpr const T& clamp(const T& value, const T& low, const T& high) {
-  return std::max(low, std::min(value, high));
-}
-
-PIDBase::PIDBase(double Kp, double Ki, double Kd, PIDSource& source,
-                 PIDOutput& output)
-    : PIDBase(Kp, Ki, Kd, 0.0, source, output) {}
-
-PIDBase::PIDBase(double Kp, double Ki, double Kd, double Kf, PIDSource& source,
-                 PIDOutput& output) {
-  m_P = Kp;
-  m_I = Ki;
-  m_D = Kd;
-  m_F = Kf;
-
-  m_pidInput = &source;
-  m_filter = LinearFilter<double>::MovingAverage(1);
-
-  m_pidOutput = &output;
-
-  m_setpointTimer.Start();
-
-  static int instances = 0;
-  instances++;
-  HAL_Report(HALUsageReporting::kResourceType_PIDController, instances);
-  SendableRegistry::GetInstance().Add(this, "PIDController", instances);
-}
-
-double PIDBase::Get() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_result;
-}
-
-void PIDBase::SetContinuous(bool continuous) {
-  std::scoped_lock lock(m_thisMutex);
-  m_continuous = continuous;
-}
-
-void PIDBase::SetInputRange(double minimumInput, double maximumInput) {
-  {
-    std::scoped_lock lock(m_thisMutex);
-    m_minimumInput = minimumInput;
-    m_maximumInput = maximumInput;
-    m_inputRange = maximumInput - minimumInput;
-  }
-
-  SetSetpoint(m_setpoint);
-}
-
-void PIDBase::SetOutputRange(double minimumOutput, double maximumOutput) {
-  std::scoped_lock lock(m_thisMutex);
-  m_minimumOutput = minimumOutput;
-  m_maximumOutput = maximumOutput;
-}
-
-void PIDBase::SetPID(double p, double i, double d) {
-  {
-    std::scoped_lock lock(m_thisMutex);
-    m_P = p;
-    m_I = i;
-    m_D = d;
-  }
-}
-
-void PIDBase::SetPID(double p, double i, double d, double f) {
-  std::scoped_lock lock(m_thisMutex);
-  m_P = p;
-  m_I = i;
-  m_D = d;
-  m_F = f;
-}
-
-void PIDBase::SetP(double p) {
-  std::scoped_lock lock(m_thisMutex);
-  m_P = p;
-}
-
-void PIDBase::SetI(double i) {
-  std::scoped_lock lock(m_thisMutex);
-  m_I = i;
-}
-
-void PIDBase::SetD(double d) {
-  std::scoped_lock lock(m_thisMutex);
-  m_D = d;
-}
-
-void PIDBase::SetF(double f) {
-  std::scoped_lock lock(m_thisMutex);
-  m_F = f;
-}
-
-double PIDBase::GetP() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_P;
-}
-
-double PIDBase::GetI() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_I;
-}
-
-double PIDBase::GetD() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_D;
-}
-
-double PIDBase::GetF() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_F;
-}
-
-void PIDBase::SetSetpoint(double setpoint) {
-  {
-    std::scoped_lock lock(m_thisMutex);
-
-    if (m_maximumInput > m_minimumInput) {
-      if (setpoint > m_maximumInput)
-        m_setpoint = m_maximumInput;
-      else if (setpoint < m_minimumInput)
-        m_setpoint = m_minimumInput;
-      else
-        m_setpoint = setpoint;
-    } else {
-      m_setpoint = setpoint;
-    }
-  }
-}
-
-double PIDBase::GetSetpoint() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_setpoint;
-}
-
-double PIDBase::GetDeltaSetpoint() const {
-  std::scoped_lock lock(m_thisMutex);
-  return (m_setpoint - m_prevSetpoint) / m_setpointTimer.Get();
-}
-
-double PIDBase::GetError() const {
-  double setpoint = GetSetpoint();
-  {
-    std::scoped_lock lock(m_thisMutex);
-    return GetContinuousError(setpoint - m_pidInput->PIDGet());
-  }
-}
-
-double PIDBase::GetAvgError() const { return GetError(); }
-
-void PIDBase::SetPIDSourceType(PIDSourceType pidSource) {
-  m_pidInput->SetPIDSourceType(pidSource);
-}
-
-PIDSourceType PIDBase::GetPIDSourceType() const {
-  return m_pidInput->GetPIDSourceType();
-}
-
-void PIDBase::SetTolerance(double percent) {
-  std::scoped_lock lock(m_thisMutex);
-  m_toleranceType = kPercentTolerance;
-  m_tolerance = percent;
-}
-
-void PIDBase::SetAbsoluteTolerance(double absTolerance) {
-  std::scoped_lock lock(m_thisMutex);
-  m_toleranceType = kAbsoluteTolerance;
-  m_tolerance = absTolerance;
-}
-
-void PIDBase::SetPercentTolerance(double percent) {
-  std::scoped_lock lock(m_thisMutex);
-  m_toleranceType = kPercentTolerance;
-  m_tolerance = percent;
-}
-
-void PIDBase::SetToleranceBuffer(int bufLength) {
-  std::scoped_lock lock(m_thisMutex);
-  m_filter = LinearFilter<double>::MovingAverage(bufLength);
-}
-
-bool PIDBase::OnTarget() const {
-  double error = GetError();
-
-  std::scoped_lock lock(m_thisMutex);
-  switch (m_toleranceType) {
-    case kPercentTolerance:
-      return std::fabs(error) < m_tolerance / 100 * m_inputRange;
-      break;
-    case kAbsoluteTolerance:
-      return std::fabs(error) < m_tolerance;
-      break;
-    case kNoTolerance:
-      // TODO: this case needs an error
-      return false;
-  }
-  return false;
-}
-
-void PIDBase::Reset() {
-  std::scoped_lock lock(m_thisMutex);
-  m_prevError = 0;
-  m_totalError = 0;
-  m_result = 0;
-}
-
-void PIDBase::PIDWrite(double output) { SetSetpoint(output); }
-
-void PIDBase::InitSendable(SendableBuilder& builder) {
-  builder.SetSmartDashboardType("PIDController");
-  builder.SetSafeState([=]() { Reset(); });
-  builder.AddDoubleProperty(
-      "p", [=]() { return GetP(); }, [=](double value) { SetP(value); });
-  builder.AddDoubleProperty(
-      "i", [=]() { return GetI(); }, [=](double value) { SetI(value); });
-  builder.AddDoubleProperty(
-      "d", [=]() { return GetD(); }, [=](double value) { SetD(value); });
-  builder.AddDoubleProperty(
-      "f", [=]() { return GetF(); }, [=](double value) { SetF(value); });
-  builder.AddDoubleProperty(
-      "setpoint", [=]() { return GetSetpoint(); },
-      [=](double value) { SetSetpoint(value); });
-}
-
-void PIDBase::Calculate() {
-  if (m_pidInput == nullptr || m_pidOutput == nullptr) return;
-
-  bool enabled;
-  {
-    std::scoped_lock lock(m_thisMutex);
-    enabled = m_enabled;
-  }
-
-  if (enabled) {
-    double input;
-
-    // Storage for function inputs
-    PIDSourceType pidSourceType;
-    double P;
-    double I;
-    double D;
-    double feedForward = CalculateFeedForward();
-    double minimumOutput;
-    double maximumOutput;
-
-    // Storage for function input-outputs
-    double prevError;
-    double error;
-    double totalError;
-
-    {
-      std::scoped_lock lock(m_thisMutex);
-
-      input = m_filter.Calculate(m_pidInput->PIDGet());
-
-      pidSourceType = m_pidInput->GetPIDSourceType();
-      P = m_P;
-      I = m_I;
-      D = m_D;
-      minimumOutput = m_minimumOutput;
-      maximumOutput = m_maximumOutput;
-
-      prevError = m_prevError;
-      error = GetContinuousError(m_setpoint - input);
-      totalError = m_totalError;
-    }
-
-    // Storage for function outputs
-    double result;
-
-    if (pidSourceType == PIDSourceType::kRate) {
-      if (P != 0) {
-        totalError =
-            clamp(totalError + error, minimumOutput / P, maximumOutput / P);
-      }
-
-      result = D * error + P * totalError + feedForward;
-    } else {
-      if (I != 0) {
-        totalError =
-            clamp(totalError + error, minimumOutput / I, maximumOutput / I);
-      }
-
-      result =
-          P * error + I * totalError + D * (error - prevError) + feedForward;
-    }
-
-    result = clamp(result, minimumOutput, maximumOutput);
-
-    {
-      // Ensures m_enabled check and PIDWrite() call occur atomically
-      std::scoped_lock pidWriteLock(m_pidWriteMutex);
-      std::unique_lock mainLock(m_thisMutex);
-      if (m_enabled) {
-        // Don't block other PIDBase operations on PIDWrite()
-        mainLock.unlock();
-
-        m_pidOutput->PIDWrite(result);
-      }
-    }
-
-    std::scoped_lock lock(m_thisMutex);
-    m_prevError = m_error;
-    m_error = error;
-    m_totalError = totalError;
-    m_result = result;
-  }
-}
-
-double PIDBase::CalculateFeedForward() {
-  if (m_pidInput->GetPIDSourceType() == PIDSourceType::kRate) {
-    return m_F * GetSetpoint();
-  } else {
-    double temp = m_F * GetDeltaSetpoint();
-    m_prevSetpoint = m_setpoint;
-    m_setpointTimer.Reset();
-    return temp;
-  }
-}
-
-double PIDBase::GetContinuousError(double error) const {
-  if (m_continuous && m_inputRange != 0) {
-    error = std::fmod(error, m_inputRange);
-    if (std::fabs(error) > m_inputRange / 2) {
-      if (error > 0) {
-        return error - m_inputRange;
-      } else {
-        return error + m_inputRange;
-      }
-    }
-  }
-
-  return error;
-}
diff --git a/wpilibc/src/main/native/cpp/PIDController.cpp b/wpilibc/src/main/native/cpp/PIDController.cpp
deleted file mode 100644
index a90a645..0000000
--- a/wpilibc/src/main/native/cpp/PIDController.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PIDController.h"
-
-#include "frc/Notifier.h"
-#include "frc/PIDOutput.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-
-using namespace frc;
-
-PIDController::PIDController(double Kp, double Ki, double Kd, PIDSource* source,
-                             PIDOutput* output, double period)
-    : PIDController(Kp, Ki, Kd, 0.0, *source, *output, period) {}
-
-PIDController::PIDController(double Kp, double Ki, double Kd, double Kf,
-                             PIDSource* source, PIDOutput* output,
-                             double period)
-    : PIDController(Kp, Ki, Kd, Kf, *source, *output, period) {}
-
-PIDController::PIDController(double Kp, double Ki, double Kd, PIDSource& source,
-                             PIDOutput& output, double period)
-    : PIDController(Kp, Ki, Kd, 0.0, source, output, period) {}
-
-PIDController::PIDController(double Kp, double Ki, double Kd, double Kf,
-                             PIDSource& source, PIDOutput& output,
-                             double period)
-    : PIDBase(Kp, Ki, Kd, Kf, source, output) {
-  m_controlLoop = std::make_unique<Notifier>(&PIDController::Calculate, this);
-  m_controlLoop->StartPeriodic(units::second_t(period));
-}
-
-PIDController::~PIDController() {
-  // Forcefully stopping the notifier so the callback can successfully run.
-  m_controlLoop->Stop();
-}
-
-void PIDController::Enable() {
-  {
-    std::scoped_lock lock(m_thisMutex);
-    m_enabled = true;
-  }
-}
-
-void PIDController::Disable() {
-  {
-    // Ensures m_enabled modification and PIDWrite() call occur atomically
-    std::scoped_lock pidWriteLock(m_pidWriteMutex);
-    {
-      std::scoped_lock mainLock(m_thisMutex);
-      m_enabled = false;
-    }
-
-    m_pidOutput->PIDWrite(0);
-  }
-}
-
-void PIDController::SetEnabled(bool enable) {
-  if (enable) {
-    Enable();
-  } else {
-    Disable();
-  }
-}
-
-bool PIDController::IsEnabled() const {
-  std::scoped_lock lock(m_thisMutex);
-  return m_enabled;
-}
-
-void PIDController::Reset() {
-  Disable();
-
-  PIDBase::Reset();
-}
-
-void PIDController::InitSendable(SendableBuilder& builder) {
-  PIDBase::InitSendable(builder);
-  builder.AddBooleanProperty(
-      "enabled", [=]() { return IsEnabled(); },
-      [=](bool value) { SetEnabled(value); });
-}
diff --git a/wpilibc/src/main/native/cpp/PIDSource.cpp b/wpilibc/src/main/native/cpp/PIDSource.cpp
deleted file mode 100644
index 28291dd..0000000
--- a/wpilibc/src/main/native/cpp/PIDSource.cpp
+++ /dev/null
@@ -1,16 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PIDSource.h"
-
-using namespace frc;
-
-void PIDSource::SetPIDSourceType(PIDSourceType pidSource) {
-  m_pidSource = pidSource;
-}
-
-PIDSourceType PIDSource::GetPIDSourceType() const { return m_pidSource; }
diff --git a/wpilibc/src/main/native/cpp/PS4Controller.cpp b/wpilibc/src/main/native/cpp/PS4Controller.cpp
new file mode 100644
index 0000000..91fd304
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/PS4Controller.cpp
@@ -0,0 +1,205 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/PS4Controller.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PS4Controller::PS4Controller(int port) : GenericHID(port) {
+  HAL_Report(HALUsageReporting::kResourceType_PS4Controller, port + 1);
+}
+
+double PS4Controller::GetLeftX() const {
+  return GetRawAxis(Axis::kLeftX);
+}
+
+double PS4Controller::GetRightX() const {
+  return GetRawAxis(Axis::kRightX);
+}
+
+double PS4Controller::GetLeftY() const {
+  return GetRawAxis(Axis::kLeftY);
+}
+
+double PS4Controller::GetRightY() const {
+  return GetRawAxis(Axis::kRightY);
+}
+
+double PS4Controller::GetL2Axis() const {
+  return GetRawAxis(Axis::kL2);
+}
+
+double PS4Controller::GetR2Axis() const {
+  return GetRawAxis(Axis::kR2);
+}
+
+bool PS4Controller::GetSquareButton() const {
+  return GetRawButton(Button::kSquare);
+}
+
+bool PS4Controller::GetSquareButtonPressed() {
+  return GetRawButtonPressed(Button::kSquare);
+}
+
+bool PS4Controller::GetSquareButtonReleased() {
+  return GetRawButtonReleased(Button::kSquare);
+}
+
+bool PS4Controller::GetCrossButton() const {
+  return GetRawButton(Button::kCross);
+}
+
+bool PS4Controller::GetCrossButtonPressed() {
+  return GetRawButtonPressed(Button::kCross);
+}
+
+bool PS4Controller::GetCrossButtonReleased() {
+  return GetRawButtonReleased(Button::kCross);
+}
+
+bool PS4Controller::GetCircleButton() const {
+  return GetRawButton(Button::kCircle);
+}
+
+bool PS4Controller::GetCircleButtonPressed() {
+  return GetRawButtonPressed(Button::kCircle);
+}
+
+bool PS4Controller::GetCircleButtonReleased() {
+  return GetRawButtonReleased(Button::kCircle);
+}
+
+bool PS4Controller::GetTriangleButton() const {
+  return GetRawButton(Button::kTriangle);
+}
+
+bool PS4Controller::GetTriangleButtonPressed() {
+  return GetRawButtonPressed(Button::kTriangle);
+}
+
+bool PS4Controller::GetTriangleButtonReleased() {
+  return GetRawButtonReleased(Button::kTriangle);
+}
+
+bool PS4Controller::GetL1Button() const {
+  return GetRawButton(Button::kL1);
+}
+
+bool PS4Controller::GetL1ButtonPressed() {
+  return GetRawButtonPressed(Button::kL1);
+}
+
+bool PS4Controller::GetL1ButtonReleased() {
+  return GetRawButtonReleased(Button::kL1);
+}
+
+bool PS4Controller::GetR1Button() const {
+  return GetRawButton(Button::kR1);
+}
+
+bool PS4Controller::GetR1ButtonPressed() {
+  return GetRawButtonPressed(Button::kR1);
+}
+
+bool PS4Controller::GetR1ButtonReleased() {
+  return GetRawButtonReleased(Button::kR1);
+}
+
+bool PS4Controller::GetL2Button() const {
+  return GetRawButton(Button::kL2);
+}
+
+bool PS4Controller::GetL2ButtonPressed() {
+  return GetRawButtonPressed(Button::kL2);
+}
+
+bool PS4Controller::GetL2ButtonReleased() {
+  return GetRawButtonReleased(Button::kL2);
+}
+
+bool PS4Controller::GetR2Button() const {
+  return GetRawButton(Button::kR2);
+}
+
+bool PS4Controller::GetR2ButtonPressed() {
+  return GetRawButtonPressed(Button::kR2);
+}
+
+bool PS4Controller::GetR2ButtonReleased() {
+  return GetRawButtonReleased(Button::kR2);
+}
+
+bool PS4Controller::GetShareButton() const {
+  return GetRawButton(Button::kShare);
+}
+
+bool PS4Controller::GetShareButtonPressed() {
+  return GetRawButtonPressed(Button::kShare);
+}
+
+bool PS4Controller::GetShareButtonReleased() {
+  return GetRawButtonReleased(Button::kShare);
+}
+
+bool PS4Controller::GetOptionsButton() const {
+  return GetRawButton(Button::kOptions);
+}
+
+bool PS4Controller::GetOptionsButtonPressed() {
+  return GetRawButtonPressed(Button::kOptions);
+}
+
+bool PS4Controller::GetOptionsButtonReleased() {
+  return GetRawButtonReleased(Button::kOptions);
+}
+
+bool PS4Controller::GetL3Button() const {
+  return GetRawButton(Button::kL3);
+}
+
+bool PS4Controller::GetL3ButtonPressed() {
+  return GetRawButtonPressed(Button::kL3);
+}
+
+bool PS4Controller::GetL3ButtonReleased() {
+  return GetRawButtonReleased(Button::kL3);
+}
+
+bool PS4Controller::GetR3Button() const {
+  return GetRawButton(Button::kR3);
+}
+
+bool PS4Controller::GetR3ButtonPressed() {
+  return GetRawButtonPressed(Button::kR3);
+}
+
+bool PS4Controller::GetR3ButtonReleased() {
+  return GetRawButtonReleased(Button::kR3);
+}
+
+bool PS4Controller::GetPSButton() const {
+  return GetRawButton(Button::kPS);
+}
+
+bool PS4Controller::GetPSButtonPressed() {
+  return GetRawButtonPressed(Button::kPS);
+}
+
+bool PS4Controller::GetPSButtonReleased() {
+  return GetRawButtonReleased(Button::kPS);
+}
+
+bool PS4Controller::GetTouchpad() const {
+  return GetRawButton(Button::kTouchpad);
+}
+
+bool PS4Controller::GetTouchpadPressed() {
+  return GetRawButtonPressed(Button::kTouchpad);
+}
+
+bool PS4Controller::GetTouchpadReleased() {
+  return GetRawButtonReleased(Button::kTouchpad);
+}
diff --git a/wpilibc/src/main/native/cpp/PWM.cpp b/wpilibc/src/main/native/cpp/PWM.cpp
index c2cd2e2..393accc 100644
--- a/wpilibc/src/main/native/cpp/PWM.cpp
+++ b/wpilibc/src/main/native/cpp/PWM.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/PWM.h"
 
@@ -13,123 +10,97 @@
 #include <hal/HALBase.h>
 #include <hal/PWM.h>
 #include <hal/Ports.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
-PWM::PWM(int channel) {
+PWM::PWM(int channel, bool registerSendable) {
   if (!SensorUtil::CheckPWMChannel(channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "PWM Channel " + wpi::Twine(channel));
-    return;
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", channel);
   }
 
+  auto stack = wpi::GetStackTrace(1);
   int32_t status = 0;
-  m_handle = HAL_InitializePWMPort(HAL_GetPort(channel), &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumPWMChannels(), channel);
-    m_channel = std::numeric_limits<int>::max();
-    m_handle = HAL_kInvalidHandle;
-    return;
-  }
+  m_handle =
+      HAL_InitializePWMPort(HAL_GetPort(channel), stack.c_str(), &status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   m_channel = channel;
 
   HAL_SetPWMDisabled(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
   status = 0;
   HAL_SetPWMEliminateDeadband(m_handle, false, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", channel);
 
   HAL_Report(HALUsageReporting::kResourceType_PWM, channel + 1);
-  SendableRegistry::GetInstance().AddLW(this, "PWM", channel);
-
-  SetSafetyEnabled(false);
+  if (registerSendable) {
+    wpi::SendableRegistry::AddLW(this, "PWM", channel);
+  }
 }
 
 PWM::~PWM() {
   int32_t status = 0;
 
   HAL_SetPWMDisabled(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "Channel {}", m_channel);
 
   HAL_FreePWMPort(m_handle, &status);
-  wpi_setHALError(status);
-}
-
-void PWM::StopMotor() { SetDisabled(); }
-
-void PWM::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "PWM " << GetChannel();
+  FRC_ReportError(status, "Channel {}", m_channel);
 }
 
 void PWM::SetRaw(uint16_t value) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
   HAL_SetPWMRaw(m_handle, value, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 uint16_t PWM::GetRaw() const {
-  if (StatusIsFatal()) return 0;
-
   int32_t status = 0;
   uint16_t value = HAL_GetPWMRaw(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 
   return value;
 }
 
 void PWM::SetPosition(double pos) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetPWMPosition(m_handle, pos, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 double PWM::GetPosition() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double position = HAL_GetPWMPosition(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return position;
 }
 
 void PWM::SetSpeed(double speed) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetPWMSpeed(m_handle, speed, &status);
-  wpi_setHALError(status);
-
-  Feed();
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 double PWM::GetSpeed() const {
-  if (StatusIsFatal()) return 0.0;
   int32_t status = 0;
   double speed = HAL_GetPWMSpeed(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   return speed;
 }
 
 void PWM::SetDisabled() {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
-
   HAL_SetPWMDisabled(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::SetPeriodMultiplier(PeriodMultiplier mult) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
 
   switch (mult) {
@@ -145,44 +116,39 @@
       HAL_SetPWMPeriodScale(m_handle, 0, &status);  // Don't squelch any outputs
       break;
     default:
-      wpi_assert(false);
+      throw FRC_MakeError(err::InvalidParameter, "PeriodMultiplier value {}",
+                          mult);
   }
 
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::SetZeroLatch() {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
-
   HAL_LatchPWMZero(m_handle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::EnableDeadbandElimination(bool eliminateDeadband) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetPWMEliminateDeadband(m_handle, eliminateDeadband, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::SetBounds(double max, double deadbandMax, double center,
                     double deadbandMin, double min) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetPWMConfig(m_handle, max, deadbandMax, center, deadbandMin, min,
                    &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::SetRawBounds(int max, int deadbandMax, int center, int deadbandMin,
                        int min) {
-  if (StatusIsFatal()) return;
   int32_t status = 0;
   HAL_SetPWMConfigRaw(m_handle, max, deadbandMax, center, deadbandMin, min,
                       &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 void PWM::GetRawBounds(int* max, int* deadbandMax, int* center,
@@ -190,16 +156,17 @@
   int32_t status = 0;
   HAL_GetPWMConfigRaw(m_handle, max, deadbandMax, center, deadbandMin, min,
                       &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
-int PWM::GetChannel() const { return m_channel; }
+int PWM::GetChannel() const {
+  return m_channel;
+}
 
-void PWM::InitSendable(SendableBuilder& builder) {
+void PWM::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("PWM");
   builder.SetActuator(true);
-  builder.SetSafeState([=]() { SetDisabled(); });
+  builder.SetSafeState([=] { SetDisabled(); });
   builder.AddDoubleProperty(
-      "Value", [=]() { return GetRaw(); },
-      [=](double value) { SetRaw(value); });
+      "Value", [=] { return GetRaw(); }, [=](double value) { SetRaw(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/PWMSparkMax.cpp b/wpilibc/src/main/native/cpp/PWMSparkMax.cpp
deleted file mode 100644
index c5375f4..0000000
--- a/wpilibc/src/main/native/cpp/PWMSparkMax.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMSparkMax.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PWMSparkMax::PWMSparkMax(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.003, 1.55, 1.50, 1.46, 0.999);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_RevSparkMaxPWM, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "PWMSparkMax", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/PWMSpeedController.cpp b/wpilibc/src/main/native/cpp/PWMSpeedController.cpp
deleted file mode 100644
index ec0be7b..0000000
--- a/wpilibc/src/main/native/cpp/PWMSpeedController.cpp
+++ /dev/null
@@ -1,41 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMSpeedController.h"
-
-#include "frc/smartdashboard/SendableBuilder.h"
-
-using namespace frc;
-
-void PWMSpeedController::Set(double speed) {
-  SetSpeed(m_isInverted ? -speed : speed);
-}
-
-double PWMSpeedController::Get() const { return GetSpeed(); }
-
-void PWMSpeedController::SetInverted(bool isInverted) {
-  m_isInverted = isInverted;
-}
-
-bool PWMSpeedController::GetInverted() const { return m_isInverted; }
-
-void PWMSpeedController::Disable() { SetDisabled(); }
-
-void PWMSpeedController::StopMotor() { PWM::StopMotor(); }
-
-void PWMSpeedController::PIDWrite(double output) { Set(output); }
-
-PWMSpeedController::PWMSpeedController(int channel) : PWM(channel) {}
-
-void PWMSpeedController::InitSendable(SendableBuilder& builder) {
-  builder.SetSmartDashboardType("Speed Controller");
-  builder.SetActuator(true);
-  builder.SetSafeState([=]() { SetDisabled(); });
-  builder.AddDoubleProperty(
-      "Value", [=]() { return GetSpeed(); },
-      [=](double value) { SetSpeed(value); });
-}
diff --git a/wpilibc/src/main/native/cpp/PWMTalonFX.cpp b/wpilibc/src/main/native/cpp/PWMTalonFX.cpp
deleted file mode 100644
index 09b7163..0000000
--- a/wpilibc/src/main/native/cpp/PWMTalonFX.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMTalonFX.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PWMTalonFX::PWMTalonFX(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_TalonFX, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "PWMTalonFX", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/PWMTalonSRX.cpp b/wpilibc/src/main/native/cpp/PWMTalonSRX.cpp
deleted file mode 100644
index 1242be9..0000000
--- a/wpilibc/src/main/native/cpp/PWMTalonSRX.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMTalonSRX.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PWMTalonSRX::PWMTalonSRX(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_PWMTalonSRX, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "PWMTalonSRX", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/PWMVenom.cpp b/wpilibc/src/main/native/cpp/PWMVenom.cpp
deleted file mode 100644
index 9fa14b7..0000000
--- a/wpilibc/src/main/native/cpp/PWMVenom.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMVenom.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PWMVenom::PWMVenom(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_FusionVenom, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "PWMVenom", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/PWMVictorSPX.cpp b/wpilibc/src/main/native/cpp/PWMVictorSPX.cpp
deleted file mode 100644
index 0d966ae..0000000
--- a/wpilibc/src/main/native/cpp/PWMVictorSPX.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PWMVictorSPX.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PWMVictorSPX::PWMVictorSPX(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_PWMVictorSPX, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "PWMVictorSPX", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/PneumaticHub.cpp b/wpilibc/src/main/native/cpp/PneumaticHub.cpp
new file mode 100644
index 0000000..8217e86
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/PneumaticHub.cpp
@@ -0,0 +1,209 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/PneumaticHub.h"
+
+#include <hal/REVPH.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/StackTrace.h>
+
+#include "frc/Compressor.h"
+#include "frc/DoubleSolenoid.h"
+#include "frc/Errors.h"
+#include "frc/SensorUtil.h"
+#include "frc/Solenoid.h"
+
+using namespace frc;
+
+wpi::mutex PneumaticHub::m_handleLock;
+std::unique_ptr<wpi::DenseMap<int, std::weak_ptr<PneumaticHub::DataStore>>>
+    PneumaticHub::m_handleMap = nullptr;
+
+// Always called under lock, so we can avoid the double lock from the magic
+// static
+std::weak_ptr<PneumaticHub::DataStore>& PneumaticHub::GetDataStore(int module) {
+  if (!m_handleMap) {
+    m_handleMap = std::make_unique<
+        wpi::DenseMap<int, std::weak_ptr<PneumaticHub::DataStore>>>();
+  }
+  return (*m_handleMap)[module];
+}
+
+class PneumaticHub::DataStore {
+ public:
+  explicit DataStore(int module, const char* stackTrace) {
+    int32_t status = 0;
+    HAL_REVPHHandle handle = HAL_InitializeREVPH(module, stackTrace, &status);
+    FRC_CheckErrorStatus(status, "Module {}", module);
+    m_moduleObject = PneumaticHub{handle, module};
+    m_moduleObject.m_dataStore =
+        std::shared_ptr<DataStore>{this, wpi::NullDeleter<DataStore>()};
+  }
+
+  ~DataStore() noexcept { HAL_FreeREVPH(m_moduleObject.m_handle); }
+
+  DataStore(DataStore&&) = delete;
+  DataStore& operator=(DataStore&&) = delete;
+
+ private:
+  friend class PneumaticHub;
+  uint32_t m_reservedMask{0};
+  bool m_compressorReserved{false};
+  wpi::mutex m_reservedLock;
+  PneumaticHub m_moduleObject{HAL_kInvalidHandle, 0};
+};
+
+PneumaticHub::PneumaticHub()
+    : PneumaticHub{SensorUtil::GetDefaultREVPHModule()} {}
+
+PneumaticHub::PneumaticHub(int module) {
+  std::string stackTrace = wpi::GetStackTrace(1);
+  std::scoped_lock lock(m_handleLock);
+  auto& res = GetDataStore(module);
+  m_dataStore = res.lock();
+  if (!m_dataStore) {
+    m_dataStore = std::make_shared<DataStore>(module, stackTrace.c_str());
+    res = m_dataStore;
+  }
+  m_handle = m_dataStore->m_moduleObject.m_handle;
+  m_module = module;
+}
+
+PneumaticHub::PneumaticHub(HAL_REVPHHandle handle, int module)
+    : m_handle{handle}, m_module{module} {}
+
+bool PneumaticHub::GetCompressor() const {
+  int32_t status = 0;
+  auto result = HAL_GetREVPHCompressor(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+void PneumaticHub::SetClosedLoopControl(bool enabled) {
+  int32_t status = 0;
+  HAL_SetREVPHClosedLoopControl(m_handle, enabled, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+bool PneumaticHub::GetClosedLoopControl() const {
+  int32_t status = 0;
+  auto result = HAL_GetREVPHClosedLoopControl(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+bool PneumaticHub::GetPressureSwitch() const {
+  int32_t status = 0;
+  auto result = HAL_GetREVPHPressureSwitch(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+double PneumaticHub::GetCompressorCurrent() const {
+  int32_t status = 0;
+  auto result = HAL_GetREVPHCompressorCurrent(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+void PneumaticHub::SetSolenoids(int mask, int values) {
+  int32_t status = 0;
+  HAL_SetREVPHSolenoids(m_handle, mask, values, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+int PneumaticHub::GetSolenoids() const {
+  int32_t status = 0;
+  auto result = HAL_GetREVPHSolenoids(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+int PneumaticHub::GetModuleNumber() const {
+  return m_module;
+}
+
+int PneumaticHub::GetSolenoidDisabledList() const {
+  return 0;
+  // TODO Fix me
+  // int32_t status = 0;
+  // auto result = HAL_GetREVPHSolenoidDisabledList(m_handle, &status);
+  // FRC_CheckErrorStatus(status, "Module {}", m_module);
+  // return result;
+}
+
+void PneumaticHub::FireOneShot(int index) {
+  // TODO Fix me
+  // int32_t status = 0;
+  // HAL_FireREVPHOneShot(m_handle, index, &status);
+  // FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+void PneumaticHub::SetOneShotDuration(int index, units::second_t duration) {
+  // TODO Fix me
+  // int32_t status = 0;
+  // units::millisecond_t millis = duration;
+  // HAL_SetREVPHOneShotDuration(m_handle, index, millis.to<int32_t>(),
+  // &status); FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+bool PneumaticHub::CheckSolenoidChannel(int channel) const {
+  return HAL_CheckREVPHSolenoidChannel(channel);
+}
+
+int PneumaticHub::CheckAndReserveSolenoids(int mask) {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  uint32_t uMask = static_cast<uint32_t>(mask);
+  if ((m_dataStore->m_reservedMask & uMask) != 0) {
+    return m_dataStore->m_reservedMask & uMask;
+  }
+  m_dataStore->m_reservedMask |= uMask;
+  return 0;
+}
+
+void PneumaticHub::UnreserveSolenoids(int mask) {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  m_dataStore->m_reservedMask &= ~(static_cast<uint32_t>(mask));
+}
+
+bool PneumaticHub::ReserveCompressor() {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  if (m_dataStore->m_compressorReserved) {
+    return false;
+  }
+  m_dataStore->m_compressorReserved = true;
+  return true;
+}
+
+void PneumaticHub::UnreserveCompressor() {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  m_dataStore->m_compressorReserved = false;
+}
+
+Solenoid PneumaticHub::MakeSolenoid(int channel) {
+  return Solenoid{m_module, PneumaticsModuleType::REVPH, channel};
+}
+
+DoubleSolenoid PneumaticHub::MakeDoubleSolenoid(int forwardChannel,
+                                                int reverseChannel) {
+  return DoubleSolenoid{m_module, PneumaticsModuleType::REVPH, forwardChannel,
+                        reverseChannel};
+}
+
+Compressor PneumaticHub::MakeCompressor() {
+  return Compressor{m_module, PneumaticsModuleType::REVPH};
+}
+
+std::shared_ptr<PneumaticsBase> PneumaticHub::GetForModule(int module) {
+  std::string stackTrace = wpi::GetStackTrace(1);
+  std::scoped_lock lock(m_handleLock);
+  auto& res = GetDataStore(module);
+  std::shared_ptr<DataStore> dataStore = res.lock();
+  if (!dataStore) {
+    dataStore = std::make_shared<DataStore>(module, stackTrace.c_str());
+    res = dataStore;
+  }
+
+  return std::shared_ptr<PneumaticsBase>{dataStore, &dataStore->m_moduleObject};
+}
diff --git a/wpilibc/src/main/native/cpp/PneumaticsBase.cpp b/wpilibc/src/main/native/cpp/PneumaticsBase.cpp
new file mode 100644
index 0000000..9d96651
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/PneumaticsBase.cpp
@@ -0,0 +1,31 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/PneumaticsBase.h"
+
+#include "frc/Errors.h"
+#include "frc/PneumaticHub.h"
+#include "frc/PneumaticsControlModule.h"
+#include "frc/SensorUtil.h"
+
+using namespace frc;
+
+std::shared_ptr<PneumaticsBase> PneumaticsBase::GetForType(
+    int module, PneumaticsModuleType moduleType) {
+  if (moduleType == PneumaticsModuleType::CTREPCM) {
+    return PneumaticsControlModule::GetForModule(module);
+  } else if (moduleType == PneumaticsModuleType::REVPH) {
+    return PneumaticHub::GetForModule(module);
+  }
+  throw FRC_MakeError(err::InvalidParameter, "{}", moduleType);
+}
+
+int PneumaticsBase::GetDefaultForType(PneumaticsModuleType moduleType) {
+  if (moduleType == PneumaticsModuleType::CTREPCM) {
+    return SensorUtil::GetDefaultCTREPCMModule();
+  } else if (moduleType == PneumaticsModuleType::REVPH) {
+    return SensorUtil::GetDefaultREVPHModule();
+  }
+  throw FRC_MakeError(err::InvalidParameter, "{}", moduleType);
+}
diff --git a/wpilibc/src/main/native/cpp/PneumaticsControlModule.cpp b/wpilibc/src/main/native/cpp/PneumaticsControlModule.cpp
new file mode 100644
index 0000000..32de5ca
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/PneumaticsControlModule.cpp
@@ -0,0 +1,269 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/PneumaticsControlModule.h"
+
+#include <hal/CTREPCM.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/StackTrace.h>
+
+#include "frc/Compressor.h"
+#include "frc/DoubleSolenoid.h"
+#include "frc/Errors.h"
+#include "frc/SensorUtil.h"
+#include "frc/Solenoid.h"
+
+using namespace frc;
+
+wpi::mutex PneumaticsControlModule::m_handleLock;
+std::unique_ptr<
+    wpi::DenseMap<int, std::weak_ptr<PneumaticsControlModule::DataStore>>>
+    PneumaticsControlModule::m_handleMap = nullptr;
+
+// Always called under lock, so we can avoid the double lock from the magic
+// static
+std::weak_ptr<PneumaticsControlModule::DataStore>&
+PneumaticsControlModule::GetDataStore(int module) {
+  if (!m_handleMap) {
+    m_handleMap = std::make_unique<wpi::DenseMap<
+        int, std::weak_ptr<PneumaticsControlModule::DataStore>>>();
+  }
+  return (*m_handleMap)[module];
+}
+
+class PneumaticsControlModule::DataStore {
+ public:
+  explicit DataStore(int module, const char* stackTrace) {
+    int32_t status = 0;
+    HAL_CTREPCMHandle handle =
+        HAL_InitializeCTREPCM(module, stackTrace, &status);
+    FRC_CheckErrorStatus(status, "Module {}", module);
+    m_moduleObject = PneumaticsControlModule{handle, module};
+    m_moduleObject.m_dataStore =
+        std::shared_ptr<DataStore>{this, wpi::NullDeleter<DataStore>()};
+  }
+
+  ~DataStore() noexcept { HAL_FreeCTREPCM(m_moduleObject.m_handle); }
+
+  DataStore(DataStore&&) = delete;
+  DataStore& operator=(DataStore&&) = delete;
+
+ private:
+  friend class PneumaticsControlModule;
+  uint32_t m_reservedMask{0};
+  bool m_compressorReserved{false};
+  wpi::mutex m_reservedLock;
+  PneumaticsControlModule m_moduleObject{HAL_kInvalidHandle, 0};
+};
+
+PneumaticsControlModule::PneumaticsControlModule()
+    : PneumaticsControlModule{SensorUtil::GetDefaultCTREPCMModule()} {}
+
+PneumaticsControlModule::PneumaticsControlModule(int module) {
+  std::string stackTrace = wpi::GetStackTrace(1);
+  std::scoped_lock lock(m_handleLock);
+  auto& res = GetDataStore(module);
+  m_dataStore = res.lock();
+  if (!m_dataStore) {
+    m_dataStore = std::make_shared<DataStore>(module, stackTrace.c_str());
+    res = m_dataStore;
+  }
+  m_handle = m_dataStore->m_moduleObject.m_handle;
+  m_module = module;
+}
+
+PneumaticsControlModule::PneumaticsControlModule(HAL_CTREPCMHandle handle,
+                                                 int module)
+    : m_handle{handle}, m_module{module} {}
+
+bool PneumaticsControlModule::GetCompressor() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressor(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+void PneumaticsControlModule::SetClosedLoopControl(bool enabled) {
+  int32_t status = 0;
+  HAL_SetCTREPCMClosedLoopControl(m_handle, enabled, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+bool PneumaticsControlModule::GetClosedLoopControl() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMClosedLoopControl(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+bool PneumaticsControlModule::GetPressureSwitch() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMPressureSwitch(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+double PneumaticsControlModule::GetCompressorCurrent() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressorCurrent(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+bool PneumaticsControlModule::GetCompressorCurrentTooHighFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressorCurrentTooHighFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetCompressorCurrentTooHighStickyFault() const {
+  int32_t status = 0;
+  auto result =
+      HAL_GetCTREPCMCompressorCurrentTooHighStickyFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetCompressorShortedFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressorShortedFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetCompressorShortedStickyFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressorShortedStickyFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetCompressorNotConnectedFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMCompressorNotConnectedFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetCompressorNotConnectedStickyFault() const {
+  int32_t status = 0;
+  auto result =
+      HAL_GetCTREPCMCompressorNotConnectedStickyFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+bool PneumaticsControlModule::GetSolenoidVoltageFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMSolenoidVoltageFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+bool PneumaticsControlModule::GetSolenoidVoltageStickyFault() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMSolenoidVoltageStickyFault(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+void PneumaticsControlModule::ClearAllStickyFaults() {
+  int32_t status = 0;
+  HAL_ClearAllCTREPCMStickyFaults(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+void PneumaticsControlModule::SetSolenoids(int mask, int values) {
+  int32_t status = 0;
+  HAL_SetCTREPCMSolenoids(m_handle, mask, values, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+int PneumaticsControlModule::GetSolenoids() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMSolenoids(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+int PneumaticsControlModule::GetModuleNumber() const {
+  return m_module;
+}
+
+int PneumaticsControlModule::GetSolenoidDisabledList() const {
+  int32_t status = 0;
+  auto result = HAL_GetCTREPCMSolenoidDisabledList(m_handle, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+  return result;
+}
+
+void PneumaticsControlModule::FireOneShot(int index) {
+  int32_t status = 0;
+  HAL_FireCTREPCMOneShot(m_handle, index, &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+void PneumaticsControlModule::SetOneShotDuration(int index,
+                                                 units::second_t duration) {
+  int32_t status = 0;
+  units::millisecond_t millis = duration;
+  HAL_SetCTREPCMOneShotDuration(m_handle, index, millis.to<int32_t>(), &status);
+  FRC_CheckErrorStatus(status, "Module {}", m_module);
+}
+
+bool PneumaticsControlModule::CheckSolenoidChannel(int channel) const {
+  return HAL_CheckCTREPCMSolenoidChannel(channel);
+}
+
+int PneumaticsControlModule::CheckAndReserveSolenoids(int mask) {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  uint32_t uMask = static_cast<uint32_t>(mask);
+  if ((m_dataStore->m_reservedMask & uMask) != 0) {
+    return m_dataStore->m_reservedMask & uMask;
+  }
+  m_dataStore->m_reservedMask |= uMask;
+  return 0;
+}
+
+void PneumaticsControlModule::UnreserveSolenoids(int mask) {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  m_dataStore->m_reservedMask &= ~(static_cast<uint32_t>(mask));
+}
+
+bool PneumaticsControlModule::ReserveCompressor() {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  if (m_dataStore->m_compressorReserved) {
+    return false;
+  }
+  m_dataStore->m_compressorReserved = true;
+  return true;
+}
+
+void PneumaticsControlModule::UnreserveCompressor() {
+  std::scoped_lock lock{m_dataStore->m_reservedLock};
+  m_dataStore->m_compressorReserved = false;
+}
+
+Solenoid PneumaticsControlModule::MakeSolenoid(int channel) {
+  return Solenoid{m_module, PneumaticsModuleType::CTREPCM, channel};
+}
+
+DoubleSolenoid PneumaticsControlModule::MakeDoubleSolenoid(int forwardChannel,
+                                                           int reverseChannel) {
+  return DoubleSolenoid{m_module, PneumaticsModuleType::CTREPCM, forwardChannel,
+                        reverseChannel};
+}
+
+Compressor PneumaticsControlModule::MakeCompressor() {
+  return Compressor{m_module, PneumaticsModuleType::CTREPCM};
+}
+
+std::shared_ptr<PneumaticsBase> PneumaticsControlModule::GetForModule(
+    int module) {
+  std::string stackTrace = wpi::GetStackTrace(1);
+  std::scoped_lock lock(m_handleLock);
+  auto& res = GetDataStore(module);
+  std::shared_ptr<DataStore> dataStore = res.lock();
+  if (!dataStore) {
+    dataStore = std::make_shared<DataStore>(module, stackTrace.c_str());
+    res = dataStore;
+  }
+
+  return std::shared_ptr<PneumaticsBase>{dataStore, &dataStore->m_moduleObject};
+}
diff --git a/wpilibc/src/main/native/cpp/PowerDistribution.cpp b/wpilibc/src/main/native/cpp/PowerDistribution.cpp
new file mode 100644
index 0000000..4c2acfc
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/PowerDistribution.cpp
@@ -0,0 +1,146 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/PowerDistribution.h"
+
+#include <fmt/format.h>
+#include <hal/FRCUsageReporting.h>
+#include <hal/Ports.h>
+#include <hal/PowerDistribution.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
+#include "frc/Errors.h"
+#include "frc/SensorUtil.h"
+
+static_assert(static_cast<HAL_PowerDistributionType>(
+                  frc::PowerDistribution::ModuleType::kAutomatic) ==
+              HAL_PowerDistributionType::HAL_PowerDistributionType_kAutomatic);
+static_assert(static_cast<HAL_PowerDistributionType>(
+                  frc::PowerDistribution::ModuleType::kCTRE) ==
+              HAL_PowerDistributionType::HAL_PowerDistributionType_kCTRE);
+static_assert(static_cast<HAL_PowerDistributionType>(
+                  frc::PowerDistribution::ModuleType::kRev) ==
+              HAL_PowerDistributionType::HAL_PowerDistributionType_kRev);
+static_assert(frc::PowerDistribution::kDefaultModule ==
+              HAL_DEFAULT_POWER_DISTRIBUTION_MODULE);
+
+using namespace frc;
+
+PowerDistribution::PowerDistribution()
+    : PowerDistribution(-1, ModuleType::kAutomatic) {}
+
+PowerDistribution::PowerDistribution(int module, ModuleType moduleType) {
+  auto stack = wpi::GetStackTrace(1);
+
+  int32_t status = 0;
+  m_handle = HAL_InitializePowerDistribution(
+      module, static_cast<HAL_PowerDistributionType>(moduleType), stack.c_str(),
+      &status);
+  FRC_CheckErrorStatus(status, "Module {}", module);
+  m_module = HAL_GetPowerDistributionModuleNumber(m_handle, &status);
+  FRC_ReportError(status, "Module {}", module);
+
+  HAL_Report(HALUsageReporting::kResourceType_PDP, m_module + 1);
+  wpi::SendableRegistry::AddLW(this, "PowerDistribution", m_module);
+}
+
+PowerDistribution::~PowerDistribution() {
+  if (m_handle != HAL_kInvalidHandle) {
+    HAL_CleanPowerDistribution(m_handle);
+    m_handle = HAL_kInvalidHandle;
+  }
+}
+
+double PowerDistribution::GetVoltage() const {
+  int32_t status = 0;
+  double voltage = HAL_GetPowerDistributionVoltage(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return voltage;
+}
+
+double PowerDistribution::GetTemperature() const {
+  int32_t status = 0;
+  double temperature = HAL_GetPowerDistributionTemperature(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return temperature;
+}
+
+double PowerDistribution::GetCurrent(int channel) const {
+  int32_t status = 0;
+  double current =
+      HAL_GetPowerDistributionChannelCurrent(m_handle, channel, &status);
+  FRC_ReportError(status, "Module {} Channel {}", m_module, channel);
+
+  return current;
+}
+
+double PowerDistribution::GetTotalCurrent() const {
+  int32_t status = 0;
+  double current = HAL_GetPowerDistributionTotalCurrent(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return current;
+}
+
+double PowerDistribution::GetTotalPower() const {
+  int32_t status = 0;
+  double power = HAL_GetPowerDistributionTotalPower(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return power;
+}
+
+double PowerDistribution::GetTotalEnergy() const {
+  int32_t status = 0;
+  double energy = HAL_GetPowerDistributionTotalEnergy(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return energy;
+}
+
+void PowerDistribution::ResetTotalEnergy() {
+  int32_t status = 0;
+  HAL_ResetPowerDistributionTotalEnergy(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+}
+
+void PowerDistribution::ClearStickyFaults() {
+  int32_t status = 0;
+  HAL_ClearPowerDistributionStickyFaults(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+}
+
+int PowerDistribution::GetModule() const {
+  return m_module;
+}
+
+bool PowerDistribution::GetSwitchableChannel() const {
+  int32_t status = 0;
+  bool state = HAL_GetPowerDistributionSwitchableChannel(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  return state;
+}
+
+void PowerDistribution::SetSwitchableChannel(bool enabled) {
+  int32_t status = 0;
+  HAL_SetPowerDistributionSwitchableChannel(m_handle, enabled, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+}
+
+void PowerDistribution::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("PowerDistribution");
+  int32_t status = 0;
+  int numChannels = HAL_GetPowerDistributionNumChannels(m_handle, &status);
+  FRC_ReportError(status, "Module {}", m_module);
+  for (int i = 0; i < numChannels; ++i) {
+    builder.AddDoubleProperty(
+        fmt::format("Chan{}", i), [=] { return GetCurrent(i); }, nullptr);
+  }
+  builder.AddDoubleProperty(
+      "Voltage", [=] { return GetVoltage(); }, nullptr);
+  builder.AddDoubleProperty(
+      "TotalCurrent", [=] { return GetTotalCurrent(); }, nullptr);
+  builder.AddBooleanProperty(
+      "SwitchableChannel", [=] { return GetSwitchableChannel(); },
+      [=](bool value) { SetSwitchableChannel(value); });
+}
diff --git a/wpilibc/src/main/native/cpp/PowerDistributionPanel.cpp b/wpilibc/src/main/native/cpp/PowerDistributionPanel.cpp
deleted file mode 100644
index 4070633..0000000
--- a/wpilibc/src/main/native/cpp/PowerDistributionPanel.cpp
+++ /dev/null
@@ -1,151 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/PowerDistributionPanel.h"
-
-#include <hal/FRCUsageReporting.h>
-#include <hal/PDP.h>
-#include <hal/Ports.h>
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
-
-#include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-PowerDistributionPanel::PowerDistributionPanel() : PowerDistributionPanel(0) {}
-
-/**
- * Initialize the PDP.
- */
-PowerDistributionPanel::PowerDistributionPanel(int module) : m_module(module) {
-  int32_t status = 0;
-  m_handle = HAL_InitializePDP(module, &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumPDPModules(), module);
-    return;
-  }
-
-  HAL_Report(HALUsageReporting::kResourceType_PDP, module + 1);
-  SendableRegistry::GetInstance().AddLW(this, "PowerDistributionPanel", module);
-}
-
-double PowerDistributionPanel::GetVoltage() const {
-  int32_t status = 0;
-
-  double voltage = HAL_GetPDPVoltage(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return voltage;
-}
-
-double PowerDistributionPanel::GetTemperature() const {
-  int32_t status = 0;
-
-  double temperature = HAL_GetPDPTemperature(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return temperature;
-}
-
-double PowerDistributionPanel::GetCurrent(int channel) const {
-  int32_t status = 0;
-
-  if (!SensorUtil::CheckPDPChannel(channel)) {
-    wpi::SmallString<32> str;
-    wpi::raw_svector_ostream buf(str);
-    buf << "PDP Channel " << channel;
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange, buf.str());
-  }
-
-  double current = HAL_GetPDPChannelCurrent(m_handle, channel, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return current;
-}
-
-double PowerDistributionPanel::GetTotalCurrent() const {
-  int32_t status = 0;
-
-  double current = HAL_GetPDPTotalCurrent(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return current;
-}
-
-double PowerDistributionPanel::GetTotalPower() const {
-  int32_t status = 0;
-
-  double power = HAL_GetPDPTotalPower(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return power;
-}
-
-double PowerDistributionPanel::GetTotalEnergy() const {
-  int32_t status = 0;
-
-  double energy = HAL_GetPDPTotalEnergy(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-
-  return energy;
-}
-
-void PowerDistributionPanel::ResetTotalEnergy() {
-  int32_t status = 0;
-
-  HAL_ResetPDPTotalEnergy(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-}
-
-void PowerDistributionPanel::ClearStickyFaults() {
-  int32_t status = 0;
-
-  HAL_ClearPDPStickyFaults(m_handle, &status);
-
-  if (status) {
-    wpi_setWPIErrorWithContext(Timeout, "");
-  }
-}
-
-int PowerDistributionPanel::GetModule() const { return m_module; }
-
-void PowerDistributionPanel::InitSendable(SendableBuilder& builder) {
-  builder.SetSmartDashboardType("PowerDistributionPanel");
-  for (int i = 0; i < SensorUtil::kPDPChannels; ++i) {
-    builder.AddDoubleProperty(
-        "Chan" + wpi::Twine(i), [=]() { return GetCurrent(i); }, nullptr);
-  }
-  builder.AddDoubleProperty(
-      "Voltage", [=]() { return GetVoltage(); }, nullptr);
-  builder.AddDoubleProperty(
-      "TotalCurrent", [=]() { return GetTotalCurrent(); }, nullptr);
-}
diff --git a/wpilibc/src/main/native/cpp/Preferences.cpp b/wpilibc/src/main/native/cpp/Preferences.cpp
index 8c1eb87..0c82f54 100644
--- a/wpilibc/src/main/native/cpp/Preferences.cpp
+++ b/wpilibc/src/main/native/cpp/Preferences.cpp
@@ -1,128 +1,168 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Preferences.h"
 
 #include <algorithm>
 
 #include <hal/FRCUsageReporting.h>
+#include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableInstance.h>
-#include <wpi/StringRef.h>
-
-#include "frc/WPIErrors.h"
 
 using namespace frc;
 
 // The Preferences table name
-static wpi::StringRef kTableName{"Preferences"};
+static constexpr std::string_view kTableName{"Preferences"};
+
+namespace {
+struct Instance {
+  Instance();
+
+  std::shared_ptr<nt::NetworkTable> table{
+      nt::NetworkTableInstance::GetDefault().GetTable(kTableName)};
+  NT_EntryListener listener;
+};
+}  // namespace
+
+static Instance& GetInstance() {
+  static Instance instance;
+  return instance;
+}
 
 Preferences* Preferences::GetInstance() {
+  ::GetInstance();
   static Preferences instance;
   return &instance;
 }
 
-std::vector<std::string> Preferences::GetKeys() { return m_table->GetKeys(); }
-
-std::string Preferences::GetString(wpi::StringRef key,
-                                   wpi::StringRef defaultValue) {
-  return m_table->GetString(key, defaultValue);
+std::vector<std::string> Preferences::GetKeys() {
+  return ::GetInstance().table->GetKeys();
 }
 
-int Preferences::GetInt(wpi::StringRef key, int defaultValue) {
-  return static_cast<int>(m_table->GetNumber(key, defaultValue));
+std::string Preferences::GetString(std::string_view key,
+                                   std::string_view defaultValue) {
+  return ::GetInstance().table->GetString(key, defaultValue);
 }
 
-double Preferences::GetDouble(wpi::StringRef key, double defaultValue) {
-  return m_table->GetNumber(key, defaultValue);
+int Preferences::GetInt(std::string_view key, int defaultValue) {
+  return static_cast<int>(::GetInstance().table->GetNumber(key, defaultValue));
 }
 
-float Preferences::GetFloat(wpi::StringRef key, float defaultValue) {
-  return m_table->GetNumber(key, defaultValue);
+double Preferences::GetDouble(std::string_view key, double defaultValue) {
+  return ::GetInstance().table->GetNumber(key, defaultValue);
 }
 
-bool Preferences::GetBoolean(wpi::StringRef key, bool defaultValue) {
-  return m_table->GetBoolean(key, defaultValue);
+float Preferences::GetFloat(std::string_view key, float defaultValue) {
+  return ::GetInstance().table->GetNumber(key, defaultValue);
 }
 
-int64_t Preferences::GetLong(wpi::StringRef key, int64_t defaultValue) {
-  return static_cast<int64_t>(m_table->GetNumber(key, defaultValue));
+bool Preferences::GetBoolean(std::string_view key, bool defaultValue) {
+  return ::GetInstance().table->GetBoolean(key, defaultValue);
 }
 
-void Preferences::PutString(wpi::StringRef key, wpi::StringRef value) {
-  auto entry = m_table->GetEntry(key);
+int64_t Preferences::GetLong(std::string_view key, int64_t defaultValue) {
+  return static_cast<int64_t>(
+      ::GetInstance().table->GetNumber(key, defaultValue));
+}
+
+void Preferences::SetString(std::string_view key, std::string_view value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetString(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitString(wpi::StringRef key, wpi::StringRef value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutString(std::string_view key, std::string_view value) {
+  SetString(key, value);
+}
+
+void Preferences::InitString(std::string_view key, std::string_view value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultString(value);
 }
 
-void Preferences::PutInt(wpi::StringRef key, int value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::SetInt(std::string_view key, int value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDouble(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitInt(wpi::StringRef key, int value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutInt(std::string_view key, int value) {
+  SetInt(key, value);
+}
+
+void Preferences::InitInt(std::string_view key, int value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultDouble(value);
 }
 
-void Preferences::PutDouble(wpi::StringRef key, double value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::SetDouble(std::string_view key, double value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDouble(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitDouble(wpi::StringRef key, double value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutDouble(std::string_view key, double value) {
+  SetDouble(key, value);
+}
+
+void Preferences::InitDouble(std::string_view key, double value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultDouble(value);
 }
 
-void Preferences::PutFloat(wpi::StringRef key, float value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::SetFloat(std::string_view key, float value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDouble(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitFloat(wpi::StringRef key, float value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutFloat(std::string_view key, float value) {
+  SetFloat(key, value);
+}
+
+void Preferences::InitFloat(std::string_view key, float value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultDouble(value);
 }
 
-void Preferences::PutBoolean(wpi::StringRef key, bool value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::SetBoolean(std::string_view key, bool value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetBoolean(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitBoolean(wpi::StringRef key, bool value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutBoolean(std::string_view key, bool value) {
+  SetBoolean(key, value);
+}
+
+void Preferences::InitBoolean(std::string_view key, bool value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultBoolean(value);
 }
 
-void Preferences::PutLong(wpi::StringRef key, int64_t value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::SetLong(std::string_view key, int64_t value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDouble(value);
   entry.SetPersistent();
 }
 
-void Preferences::InitLong(wpi::StringRef key, int64_t value) {
-  auto entry = m_table->GetEntry(key);
+void Preferences::PutLong(std::string_view key, int64_t value) {
+  SetLong(key, value);
+}
+
+void Preferences::InitLong(std::string_view key, int64_t value) {
+  auto entry = ::GetInstance().table->GetEntry(key);
   entry.SetDefaultDouble(value);
 }
 
-bool Preferences::ContainsKey(wpi::StringRef key) {
-  return m_table->ContainsKey(key);
+bool Preferences::ContainsKey(std::string_view key) {
+  return ::GetInstance().table->ContainsKey(key);
 }
 
-void Preferences::Remove(wpi::StringRef key) { m_table->Delete(key); }
+void Preferences::Remove(std::string_view key) {
+  ::GetInstance().table->Delete(key);
+}
 
 void Preferences::RemoveAll() {
   for (auto preference : GetKeys()) {
@@ -132,11 +172,10 @@
   }
 }
 
-Preferences::Preferences()
-    : m_table(nt::NetworkTableInstance::GetDefault().GetTable(kTableName)) {
-  m_table->GetEntry(".type").SetString("RobotPreferences");
-  m_listener = m_table->AddEntryListener(
-      [=](nt::NetworkTable* table, wpi::StringRef name,
+Instance::Instance() {
+  table->GetEntry(".type").SetString("RobotPreferences");
+  listener = table->AddEntryListener(
+      [=](nt::NetworkTable* table, std::string_view name,
           nt::NetworkTableEntry entry, std::shared_ptr<nt::Value> value,
           int flags) { entry.SetPersistent(); },
       NT_NOTIFY_NEW | NT_NOTIFY_IMMEDIATE);
diff --git a/wpilibc/src/main/native/cpp/Relay.cpp b/wpilibc/src/main/native/cpp/Relay.cpp
index cb95223..9bec566 100644
--- a/wpilibc/src/main/native/cpp/Relay.cpp
+++ b/wpilibc/src/main/native/cpp/Relay.cpp
@@ -1,32 +1,29 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Relay.h"
 
 #include <utility>
 
+#include <fmt/format.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <hal/Ports.h>
 #include <hal/Relay.h>
-#include <wpi/raw_ostream.h>
+#include <wpi/StackTrace.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
 Relay::Relay(int channel, Relay::Direction direction)
     : m_channel(channel), m_direction(direction) {
   if (!SensorUtil::CheckRelayChannel(m_channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "Relay Channel " + wpi::Twine(m_channel));
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", m_channel);
     return;
   }
 
@@ -34,49 +31,32 @@
 
   if (m_direction == kBothDirections || m_direction == kForwardOnly) {
     int32_t status = 0;
-    m_forwardHandle = HAL_InitializeRelayPort(portHandle, true, &status);
-    if (status != 0) {
-      wpi_setHALErrorWithRange(status, 0, HAL_GetNumRelayChannels(), channel);
-      m_forwardHandle = HAL_kInvalidHandle;
-      m_reverseHandle = HAL_kInvalidHandle;
-      return;
-    }
+    std::string stackTrace = wpi::GetStackTrace(1);
+    m_forwardHandle =
+        HAL_InitializeRelayPort(portHandle, true, stackTrace.c_str(), &status);
+    FRC_CheckErrorStatus(status, "Channel {}", m_channel);
     HAL_Report(HALUsageReporting::kResourceType_Relay, m_channel + 1);
   }
   if (m_direction == kBothDirections || m_direction == kReverseOnly) {
     int32_t status = 0;
-    m_reverseHandle = HAL_InitializeRelayPort(portHandle, false, &status);
-    if (status != 0) {
-      wpi_setHALErrorWithRange(status, 0, HAL_GetNumRelayChannels(), channel);
-      m_forwardHandle = HAL_kInvalidHandle;
-      m_reverseHandle = HAL_kInvalidHandle;
-      return;
-    }
-
+    std::string stackTrace = wpi::GetStackTrace(1);
+    m_reverseHandle =
+        HAL_InitializeRelayPort(portHandle, false, stackTrace.c_str(), &status);
+    FRC_CheckErrorStatus(status, "Channel {}", m_channel);
     HAL_Report(HALUsageReporting::kResourceType_Relay, m_channel + 128);
   }
 
   int32_t status = 0;
   if (m_forwardHandle != HAL_kInvalidHandle) {
     HAL_SetRelay(m_forwardHandle, false, &status);
-    if (status != 0) {
-      wpi_setHALError(status);
-      m_forwardHandle = HAL_kInvalidHandle;
-      m_reverseHandle = HAL_kInvalidHandle;
-      return;
-    }
+    FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   }
   if (m_reverseHandle != HAL_kInvalidHandle) {
     HAL_SetRelay(m_reverseHandle, false, &status);
-    if (status != 0) {
-      wpi_setHALError(status);
-      m_forwardHandle = HAL_kInvalidHandle;
-      m_reverseHandle = HAL_kInvalidHandle;
-      return;
-    }
+    FRC_CheckErrorStatus(status, "Channel {}", m_channel);
   }
 
-  SendableRegistry::GetInstance().AddLW(this, "Relay", m_channel);
+  wpi::SendableRegistry::AddLW(this, "Relay", m_channel);
 }
 
 Relay::~Relay() {
@@ -84,13 +64,15 @@
   HAL_SetRelay(m_forwardHandle, false, &status);
   HAL_SetRelay(m_reverseHandle, false, &status);
   // ignore errors, as we want to make sure a free happens.
-  if (m_forwardHandle != HAL_kInvalidHandle) HAL_FreeRelayPort(m_forwardHandle);
-  if (m_reverseHandle != HAL_kInvalidHandle) HAL_FreeRelayPort(m_reverseHandle);
+  if (m_forwardHandle != HAL_kInvalidHandle) {
+    HAL_FreeRelayPort(m_forwardHandle);
+  }
+  if (m_reverseHandle != HAL_kInvalidHandle) {
+    HAL_FreeRelayPort(m_reverseHandle);
+  }
 }
 
 void Relay::Set(Relay::Value value) {
-  if (StatusIsFatal()) return;
-
   int32_t status = 0;
 
   switch (value) {
@@ -112,7 +94,8 @@
       break;
     case kForward:
       if (m_direction == kReverseOnly) {
-        wpi_setWPIError(IncompatibleMode);
+        FRC_ReportError(err::IncompatibleMode, "channel {} setting {}",
+                        m_channel, "forward");
         break;
       }
       if (m_direction == kBothDirections || m_direction == kForwardOnly) {
@@ -124,7 +107,8 @@
       break;
     case kReverse:
       if (m_direction == kForwardOnly) {
-        wpi_setWPIError(IncompatibleMode);
+        FRC_ReportError(err::IncompatibleMode, "channel {} setting {}",
+                        m_channel, "reverse");
         break;
       }
       if (m_direction == kBothDirections) {
@@ -136,58 +120,65 @@
       break;
   }
 
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
 }
 
 Relay::Value Relay::Get() const {
-  int32_t status;
+  Relay::Value value = kOff;
+  int32_t status = 0;
 
   if (m_direction == kForwardOnly) {
     if (HAL_GetRelay(m_forwardHandle, &status)) {
-      return kOn;
+      value = kOn;
     } else {
-      return kOff;
+      value = kOff;
     }
   } else if (m_direction == kReverseOnly) {
     if (HAL_GetRelay(m_reverseHandle, &status)) {
-      return kOn;
+      value = kOn;
     } else {
-      return kOff;
+      value = kOff;
     }
   } else {
     if (HAL_GetRelay(m_forwardHandle, &status)) {
       if (HAL_GetRelay(m_reverseHandle, &status)) {
-        return kOn;
+        value = kOn;
       } else {
-        return kForward;
+        value = kForward;
       }
     } else {
       if (HAL_GetRelay(m_reverseHandle, &status)) {
-        return kReverse;
+        value = kReverse;
       } else {
-        return kOff;
+        value = kOff;
       }
     }
   }
 
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Channel {}", m_channel);
+
+  return value;
 }
 
-int Relay::GetChannel() const { return m_channel; }
-
-void Relay::StopMotor() { Set(kOff); }
-
-void Relay::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "Relay " << GetChannel();
+int Relay::GetChannel() const {
+  return m_channel;
 }
 
-void Relay::InitSendable(SendableBuilder& builder) {
+void Relay::StopMotor() {
+  Set(kOff);
+}
+
+std::string Relay::GetDescription() const {
+  return fmt::format("Relay {}", GetChannel());
+}
+
+void Relay::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Relay");
   builder.SetActuator(true);
-  builder.SetSafeState([=]() { Set(kOff); });
+  builder.SetSafeState([=] { Set(kOff); });
   builder.AddSmallStringProperty(
       "Value",
-      [=](wpi::SmallVectorImpl<char>& buf) -> wpi::StringRef {
+      [=](wpi::SmallVectorImpl<char>& buf) -> std::string_view {
         switch (Get()) {
           case kOn:
             return "On";
@@ -199,14 +190,15 @@
             return "Off";
         }
       },
-      [=](wpi::StringRef value) {
-        if (value == "Off")
+      [=](std::string_view value) {
+        if (value == "Off") {
           Set(kOff);
-        else if (value == "Forward")
+        } else if (value == "Forward") {
           Set(kForward);
-        else if (value == "Reverse")
+        } else if (value == "Reverse") {
           Set(kReverse);
-        else if (value == "On")
+        } else if (value == "On") {
           Set(kOn);
+        }
       });
 }
diff --git a/wpilibc/src/main/native/cpp/Resource.cpp b/wpilibc/src/main/native/cpp/Resource.cpp
index d546461..1f0e348 100644
--- a/wpilibc/src/main/native/cpp/Resource.cpp
+++ b/wpilibc/src/main/native/cpp/Resource.cpp
@@ -1,14 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Resource.h"
 
-#include "frc/ErrorBase.h"
-#include "frc/WPIErrors.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
@@ -34,19 +30,16 @@
       return i;
     }
   }
-  wpi_setWPIErrorWithContext(NoAvailableResources, resourceDesc);
-  return std::numeric_limits<uint32_t>::max();
+  throw FRC_MakeError(err::NoAvailableResources, "{}", resourceDesc);
 }
 
 uint32_t Resource::Allocate(uint32_t index, const std::string& resourceDesc) {
   std::scoped_lock lock(m_allocateMutex);
   if (index >= m_isAllocated.size()) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange, resourceDesc);
-    return std::numeric_limits<uint32_t>::max();
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "{}", resourceDesc);
   }
   if (m_isAllocated[index]) {
-    wpi_setWPIErrorWithContext(ResourceAlreadyAllocated, resourceDesc);
-    return std::numeric_limits<uint32_t>::max();
+    throw FRC_MakeError(err::ResourceAlreadyAllocated, "{}", resourceDesc);
   }
   m_isAllocated[index] = true;
   return index;
@@ -54,14 +47,14 @@
 
 void Resource::Free(uint32_t index) {
   std::unique_lock lock(m_allocateMutex);
-  if (index == std::numeric_limits<uint32_t>::max()) return;
-  if (index >= m_isAllocated.size()) {
-    wpi_setWPIError(NotAllocated);
+  if (index == std::numeric_limits<uint32_t>::max()) {
     return;
   }
+  if (index >= m_isAllocated.size()) {
+    throw FRC_MakeError(err::NotAllocated, "index {}", index);
+  }
   if (!m_isAllocated[index]) {
-    wpi_setWPIError(NotAllocated);
-    return;
+    throw FRC_MakeError(err::NotAllocated, "index {}", index);
   }
   m_isAllocated[index] = false;
 }
diff --git a/wpilibc/src/main/native/cpp/RobotController.cpp b/wpilibc/src/main/native/cpp/RobotController.cpp
index b33479f..8bc2d6b 100644
--- a/wpilibc/src/main/native/cpp/RobotController.cpp
+++ b/wpilibc/src/main/native/cpp/RobotController.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/RobotController.h"
 
@@ -11,152 +8,170 @@
 #include <hal/HALBase.h>
 #include <hal/Power.h>
 
-#include "frc/ErrorBase.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
 int RobotController::GetFPGAVersion() {
   int32_t status = 0;
   int version = HAL_GetFPGAVersion(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFPGAVersion");
   return version;
 }
 
 int64_t RobotController::GetFPGARevision() {
   int32_t status = 0;
   int64_t revision = HAL_GetFPGARevision(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFPGARevision");
   return revision;
 }
 
 uint64_t RobotController::GetFPGATime() {
   int32_t status = 0;
   uint64_t time = HAL_GetFPGATime(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFPGATime");
   return time;
 }
 
 bool RobotController::GetUserButton() {
   int32_t status = 0;
-
   bool value = HAL_GetFPGAButton(&status);
-  wpi_setGlobalError(status);
-
+  FRC_CheckErrorStatus(status, "{}", "GetUserButton");
   return value;
 }
 
+units::volt_t RobotController::GetBatteryVoltage() {
+  int32_t status = 0;
+  double retVal = HAL_GetVinVoltage(&status);
+  FRC_CheckErrorStatus(status, "{}", "GetBatteryVoltage");
+  return units::volt_t{retVal};
+}
+
 bool RobotController::IsSysActive() {
   int32_t status = 0;
   bool retVal = HAL_GetSystemActive(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "IsSysActive");
   return retVal;
 }
 
 bool RobotController::IsBrownedOut() {
   int32_t status = 0;
   bool retVal = HAL_GetBrownedOut(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "IsBrownedOut");
   return retVal;
 }
 
 double RobotController::GetInputVoltage() {
   int32_t status = 0;
   double retVal = HAL_GetVinVoltage(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetInputVoltage");
   return retVal;
 }
 
 double RobotController::GetInputCurrent() {
   int32_t status = 0;
   double retVal = HAL_GetVinCurrent(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetInputCurrent");
   return retVal;
 }
 
 double RobotController::GetVoltage3V3() {
   int32_t status = 0;
   double retVal = HAL_GetUserVoltage3V3(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetVoltage3V3");
   return retVal;
 }
 
 double RobotController::GetCurrent3V3() {
   int32_t status = 0;
   double retVal = HAL_GetUserCurrent3V3(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetCurrent3V3");
   return retVal;
 }
 
 bool RobotController::GetEnabled3V3() {
   int32_t status = 0;
   bool retVal = HAL_GetUserActive3V3(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetEnabled3V3");
   return retVal;
 }
 
 int RobotController::GetFaultCount3V3() {
   int32_t status = 0;
   int retVal = HAL_GetUserCurrentFaults3V3(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFaultCount3V3");
   return retVal;
 }
 
 double RobotController::GetVoltage5V() {
   int32_t status = 0;
   double retVal = HAL_GetUserVoltage5V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetVoltage5V");
   return retVal;
 }
 
 double RobotController::GetCurrent5V() {
   int32_t status = 0;
   double retVal = HAL_GetUserCurrent5V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetCurrent5V");
   return retVal;
 }
 
 bool RobotController::GetEnabled5V() {
   int32_t status = 0;
   bool retVal = HAL_GetUserActive5V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetEnabled5V");
   return retVal;
 }
 
 int RobotController::GetFaultCount5V() {
   int32_t status = 0;
   int retVal = HAL_GetUserCurrentFaults5V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFaultCount5V");
   return retVal;
 }
 
 double RobotController::GetVoltage6V() {
   int32_t status = 0;
   double retVal = HAL_GetUserVoltage6V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetVoltage6V");
   return retVal;
 }
 
 double RobotController::GetCurrent6V() {
   int32_t status = 0;
   double retVal = HAL_GetUserCurrent6V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetCurrent6V");
   return retVal;
 }
 
 bool RobotController::GetEnabled6V() {
   int32_t status = 0;
   bool retVal = HAL_GetUserActive6V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetEnabled6V");
   return retVal;
 }
 
 int RobotController::GetFaultCount6V() {
   int32_t status = 0;
   int retVal = HAL_GetUserCurrentFaults6V(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetFaultCount6V");
   return retVal;
 }
 
+units::volt_t RobotController::GetBrownoutVoltage() {
+  int32_t status = 0;
+  double retVal = HAL_GetBrownoutVoltage(&status);
+  FRC_CheckErrorStatus(status, "{}", "GetBrownoutVoltage");
+  return units::volt_t(retVal);
+}
+
+void RobotController::SetBrownoutVoltage(units::volt_t brownoutVoltage) {
+  int32_t status = 0;
+  HAL_SetBrownoutVoltage(brownoutVoltage.value(), &status);
+  FRC_CheckErrorStatus(status, "{}", "SetBrownoutVoltage");
+}
+
 CANStatus RobotController::GetCANStatus() {
   int32_t status = 0;
   float percentBusUtilization = 0;
@@ -166,10 +181,7 @@
   uint32_t transmitErrorCount = 0;
   HAL_CAN_GetCANStatus(&percentBusUtilization, &busOffCount, &txFullCount,
                        &receiveErrorCount, &transmitErrorCount, &status);
-  if (status != 0) {
-    wpi_setGlobalHALError(status);
-    return {};
-  }
+  FRC_CheckErrorStatus(status, "{}", "GetCANStatus");
   return {percentBusUtilization, static_cast<int>(busOffCount),
           static_cast<int>(txFullCount), static_cast<int>(receiveErrorCount),
           static_cast<int>(transmitErrorCount)};
diff --git a/wpilibc/src/main/native/cpp/RobotDrive.cpp b/wpilibc/src/main/native/cpp/RobotDrive.cpp
deleted file mode 100644
index 9eafe0c..0000000
--- a/wpilibc/src/main/native/cpp/RobotDrive.cpp
+++ /dev/null
@@ -1,427 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/RobotDrive.h"
-
-#include <algorithm>
-#include <cmath>
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/GenericHID.h"
-#include "frc/Joystick.h"
-#include "frc/Talon.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
-
-using namespace frc;
-
-static std::shared_ptr<SpeedController> make_shared_nodelete(
-    SpeedController* ptr) {
-  return std::shared_ptr<SpeedController>(ptr, NullDeleter<SpeedController>());
-}
-
-RobotDrive::RobotDrive(int leftMotorChannel, int rightMotorChannel) {
-  InitRobotDrive();
-  m_rearLeftMotor = std::make_shared<Talon>(leftMotorChannel);
-  m_rearRightMotor = std::make_shared<Talon>(rightMotorChannel);
-  SetLeftRightMotorOutputs(0.0, 0.0);
-}
-
-RobotDrive::RobotDrive(int frontLeftMotor, int rearLeftMotor,
-                       int frontRightMotor, int rearRightMotor) {
-  InitRobotDrive();
-  m_rearLeftMotor = std::make_shared<Talon>(rearLeftMotor);
-  m_rearRightMotor = std::make_shared<Talon>(rearRightMotor);
-  m_frontLeftMotor = std::make_shared<Talon>(frontLeftMotor);
-  m_frontRightMotor = std::make_shared<Talon>(frontRightMotor);
-  SetLeftRightMotorOutputs(0.0, 0.0);
-}
-
-RobotDrive::RobotDrive(SpeedController* leftMotor,
-                       SpeedController* rightMotor) {
-  InitRobotDrive();
-  if (leftMotor == nullptr || rightMotor == nullptr) {
-    wpi_setWPIError(NullParameter);
-    m_rearLeftMotor = m_rearRightMotor = nullptr;
-    return;
-  }
-  m_rearLeftMotor = make_shared_nodelete(leftMotor);
-  m_rearRightMotor = make_shared_nodelete(rightMotor);
-}
-
-RobotDrive::RobotDrive(SpeedController& leftMotor,
-                       SpeedController& rightMotor) {
-  InitRobotDrive();
-  m_rearLeftMotor = make_shared_nodelete(&leftMotor);
-  m_rearRightMotor = make_shared_nodelete(&rightMotor);
-}
-
-RobotDrive::RobotDrive(std::shared_ptr<SpeedController> leftMotor,
-                       std::shared_ptr<SpeedController> rightMotor) {
-  InitRobotDrive();
-  if (leftMotor == nullptr || rightMotor == nullptr) {
-    wpi_setWPIError(NullParameter);
-    m_rearLeftMotor = m_rearRightMotor = nullptr;
-    return;
-  }
-  m_rearLeftMotor = leftMotor;
-  m_rearRightMotor = rightMotor;
-}
-
-RobotDrive::RobotDrive(SpeedController* frontLeftMotor,
-                       SpeedController* rearLeftMotor,
-                       SpeedController* frontRightMotor,
-                       SpeedController* rearRightMotor) {
-  InitRobotDrive();
-  if (frontLeftMotor == nullptr || rearLeftMotor == nullptr ||
-      frontRightMotor == nullptr || rearRightMotor == nullptr) {
-    wpi_setWPIError(NullParameter);
-    return;
-  }
-  m_frontLeftMotor = make_shared_nodelete(frontLeftMotor);
-  m_rearLeftMotor = make_shared_nodelete(rearLeftMotor);
-  m_frontRightMotor = make_shared_nodelete(frontRightMotor);
-  m_rearRightMotor = make_shared_nodelete(rearRightMotor);
-}
-
-RobotDrive::RobotDrive(SpeedController& frontLeftMotor,
-                       SpeedController& rearLeftMotor,
-                       SpeedController& frontRightMotor,
-                       SpeedController& rearRightMotor) {
-  InitRobotDrive();
-  m_frontLeftMotor = make_shared_nodelete(&frontLeftMotor);
-  m_rearLeftMotor = make_shared_nodelete(&rearLeftMotor);
-  m_frontRightMotor = make_shared_nodelete(&frontRightMotor);
-  m_rearRightMotor = make_shared_nodelete(&rearRightMotor);
-}
-
-RobotDrive::RobotDrive(std::shared_ptr<SpeedController> frontLeftMotor,
-                       std::shared_ptr<SpeedController> rearLeftMotor,
-                       std::shared_ptr<SpeedController> frontRightMotor,
-                       std::shared_ptr<SpeedController> rearRightMotor) {
-  InitRobotDrive();
-  if (frontLeftMotor == nullptr || rearLeftMotor == nullptr ||
-      frontRightMotor == nullptr || rearRightMotor == nullptr) {
-    wpi_setWPIError(NullParameter);
-    return;
-  }
-  m_frontLeftMotor = frontLeftMotor;
-  m_rearLeftMotor = rearLeftMotor;
-  m_frontRightMotor = frontRightMotor;
-  m_rearRightMotor = rearRightMotor;
-}
-
-void RobotDrive::Drive(double outputMagnitude, double curve) {
-  double leftOutput, rightOutput;
-  static bool reported = false;
-  if (!reported) {
-    HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
-               HALUsageReporting::kRobotDrive_ArcadeRatioCurve, GetNumMotors());
-    reported = true;
-  }
-
-  if (curve < 0) {
-    double value = std::log(-curve);
-    double ratio = (value - m_sensitivity) / (value + m_sensitivity);
-    if (ratio == 0) ratio = 0.0000000001;
-    leftOutput = outputMagnitude / ratio;
-    rightOutput = outputMagnitude;
-  } else if (curve > 0) {
-    double value = std::log(curve);
-    double ratio = (value - m_sensitivity) / (value + m_sensitivity);
-    if (ratio == 0) ratio = 0.0000000001;
-    leftOutput = outputMagnitude;
-    rightOutput = outputMagnitude / ratio;
-  } else {
-    leftOutput = outputMagnitude;
-    rightOutput = outputMagnitude;
-  }
-  SetLeftRightMotorOutputs(leftOutput, rightOutput);
-}
-
-void RobotDrive::TankDrive(GenericHID* leftStick, GenericHID* rightStick,
-                           bool squaredInputs) {
-  if (leftStick == nullptr || rightStick == nullptr) {
-    wpi_setWPIError(NullParameter);
-    return;
-  }
-  TankDrive(leftStick->GetY(), rightStick->GetY(), squaredInputs);
-}
-
-void RobotDrive::TankDrive(GenericHID& leftStick, GenericHID& rightStick,
-                           bool squaredInputs) {
-  TankDrive(leftStick.GetY(), rightStick.GetY(), squaredInputs);
-}
-
-void RobotDrive::TankDrive(GenericHID* leftStick, int leftAxis,
-                           GenericHID* rightStick, int rightAxis,
-                           bool squaredInputs) {
-  if (leftStick == nullptr || rightStick == nullptr) {
-    wpi_setWPIError(NullParameter);
-    return;
-  }
-  TankDrive(leftStick->GetRawAxis(leftAxis), rightStick->GetRawAxis(rightAxis),
-            squaredInputs);
-}
-
-void RobotDrive::TankDrive(GenericHID& leftStick, int leftAxis,
-                           GenericHID& rightStick, int rightAxis,
-                           bool squaredInputs) {
-  TankDrive(leftStick.GetRawAxis(leftAxis), rightStick.GetRawAxis(rightAxis),
-            squaredInputs);
-}
-
-void RobotDrive::TankDrive(double leftValue, double rightValue,
-                           bool squaredInputs) {
-  static bool reported = false;
-  if (!reported) {
-    HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
-               HALUsageReporting::kRobotDrive_Tank, GetNumMotors());
-    reported = true;
-  }
-
-  leftValue = Limit(leftValue);
-  rightValue = Limit(rightValue);
-
-  // square the inputs (while preserving the sign) to increase fine control
-  // while permitting full power
-  if (squaredInputs) {
-    leftValue = std::copysign(leftValue * leftValue, leftValue);
-    rightValue = std::copysign(rightValue * rightValue, rightValue);
-  }
-
-  SetLeftRightMotorOutputs(leftValue, rightValue);
-}
-
-void RobotDrive::ArcadeDrive(GenericHID* stick, bool squaredInputs) {
-  // simply call the full-featured ArcadeDrive with the appropriate values
-  ArcadeDrive(stick->GetY(), stick->GetX(), squaredInputs);
-}
-
-void RobotDrive::ArcadeDrive(GenericHID& stick, bool squaredInputs) {
-  // simply call the full-featured ArcadeDrive with the appropriate values
-  ArcadeDrive(stick.GetY(), stick.GetX(), squaredInputs);
-}
-
-void RobotDrive::ArcadeDrive(GenericHID* moveStick, int moveAxis,
-                             GenericHID* rotateStick, int rotateAxis,
-                             bool squaredInputs) {
-  double moveValue = moveStick->GetRawAxis(moveAxis);
-  double rotateValue = rotateStick->GetRawAxis(rotateAxis);
-
-  ArcadeDrive(moveValue, rotateValue, squaredInputs);
-}
-
-void RobotDrive::ArcadeDrive(GenericHID& moveStick, int moveAxis,
-                             GenericHID& rotateStick, int rotateAxis,
-                             bool squaredInputs) {
-  double moveValue = moveStick.GetRawAxis(moveAxis);
-  double rotateValue = rotateStick.GetRawAxis(rotateAxis);
-
-  ArcadeDrive(moveValue, rotateValue, squaredInputs);
-}
-
-void RobotDrive::ArcadeDrive(double moveValue, double rotateValue,
-                             bool squaredInputs) {
-  static bool reported = false;
-  if (!reported) {
-    HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
-               HALUsageReporting::kRobotDrive_ArcadeStandard, GetNumMotors());
-    reported = true;
-  }
-
-  // local variables to hold the computed PWM values for the motors
-  double leftMotorOutput;
-  double rightMotorOutput;
-
-  moveValue = Limit(moveValue);
-  rotateValue = Limit(rotateValue);
-
-  // square the inputs (while preserving the sign) to increase fine control
-  // while permitting full power
-  if (squaredInputs) {
-    moveValue = std::copysign(moveValue * moveValue, moveValue);
-    rotateValue = std::copysign(rotateValue * rotateValue, rotateValue);
-  }
-
-  if (moveValue > 0.0) {
-    if (rotateValue > 0.0) {
-      leftMotorOutput = moveValue - rotateValue;
-      rightMotorOutput = std::max(moveValue, rotateValue);
-    } else {
-      leftMotorOutput = std::max(moveValue, -rotateValue);
-      rightMotorOutput = moveValue + rotateValue;
-    }
-  } else {
-    if (rotateValue > 0.0) {
-      leftMotorOutput = -std::max(-moveValue, rotateValue);
-      rightMotorOutput = moveValue + rotateValue;
-    } else {
-      leftMotorOutput = moveValue - rotateValue;
-      rightMotorOutput = -std::max(-moveValue, -rotateValue);
-    }
-  }
-  SetLeftRightMotorOutputs(leftMotorOutput, rightMotorOutput);
-}
-
-void RobotDrive::MecanumDrive_Cartesian(double x, double y, double rotation,
-                                        double gyroAngle) {
-  static bool reported = false;
-  if (!reported) {
-    HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
-               HALUsageReporting::kRobotDrive_MecanumCartesian, GetNumMotors());
-    reported = true;
-  }
-
-  double xIn = x;
-  double yIn = y;
-  // Negate y for the joystick.
-  yIn = -yIn;
-  // Compensate for gyro angle.
-  RotateVector(xIn, yIn, gyroAngle);
-
-  double wheelSpeeds[kMaxNumberOfMotors];
-  wheelSpeeds[kFrontLeftMotor] = xIn + yIn + rotation;
-  wheelSpeeds[kFrontRightMotor] = -xIn + yIn - rotation;
-  wheelSpeeds[kRearLeftMotor] = -xIn + yIn + rotation;
-  wheelSpeeds[kRearRightMotor] = xIn + yIn - rotation;
-
-  Normalize(wheelSpeeds);
-
-  m_frontLeftMotor->Set(wheelSpeeds[kFrontLeftMotor] * m_maxOutput);
-  m_frontRightMotor->Set(wheelSpeeds[kFrontRightMotor] * m_maxOutput);
-  m_rearLeftMotor->Set(wheelSpeeds[kRearLeftMotor] * m_maxOutput);
-  m_rearRightMotor->Set(wheelSpeeds[kRearRightMotor] * m_maxOutput);
-
-  Feed();
-}
-
-void RobotDrive::MecanumDrive_Polar(double magnitude, double direction,
-                                    double rotation) {
-  static bool reported = false;
-  if (!reported) {
-    HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
-               HALUsageReporting::kRobotDrive_MecanumPolar, GetNumMotors());
-    reported = true;
-  }
-
-  // Normalized for full power along the Cartesian axes.
-  magnitude = Limit(magnitude) * std::sqrt(2.0);
-  // The rollers are at 45 degree angles.
-  double dirInRad = (direction + 45.0) * 3.14159 / 180.0;
-  double cosD = std::cos(dirInRad);
-  double sinD = std::sin(dirInRad);
-
-  double wheelSpeeds[kMaxNumberOfMotors];
-  wheelSpeeds[kFrontLeftMotor] = sinD * magnitude + rotation;
-  wheelSpeeds[kFrontRightMotor] = cosD * magnitude - rotation;
-  wheelSpeeds[kRearLeftMotor] = cosD * magnitude + rotation;
-  wheelSpeeds[kRearRightMotor] = sinD * magnitude - rotation;
-
-  Normalize(wheelSpeeds);
-
-  m_frontLeftMotor->Set(wheelSpeeds[kFrontLeftMotor] * m_maxOutput);
-  m_frontRightMotor->Set(wheelSpeeds[kFrontRightMotor] * m_maxOutput);
-  m_rearLeftMotor->Set(wheelSpeeds[kRearLeftMotor] * m_maxOutput);
-  m_rearRightMotor->Set(wheelSpeeds[kRearRightMotor] * m_maxOutput);
-
-  Feed();
-}
-
-void RobotDrive::HolonomicDrive(double magnitude, double direction,
-                                double rotation) {
-  MecanumDrive_Polar(magnitude, direction, rotation);
-}
-
-void RobotDrive::SetLeftRightMotorOutputs(double leftOutput,
-                                          double rightOutput) {
-  wpi_assert(m_rearLeftMotor != nullptr && m_rearRightMotor != nullptr);
-
-  if (m_frontLeftMotor != nullptr)
-    m_frontLeftMotor->Set(Limit(leftOutput) * m_maxOutput);
-  m_rearLeftMotor->Set(Limit(leftOutput) * m_maxOutput);
-
-  if (m_frontRightMotor != nullptr)
-    m_frontRightMotor->Set(-Limit(rightOutput) * m_maxOutput);
-  m_rearRightMotor->Set(-Limit(rightOutput) * m_maxOutput);
-
-  Feed();
-}
-
-void RobotDrive::SetInvertedMotor(MotorType motor, bool isInverted) {
-  if (motor < 0 || motor > 3) {
-    wpi_setWPIError(InvalidMotorIndex);
-    return;
-  }
-  switch (motor) {
-    case kFrontLeftMotor:
-      m_frontLeftMotor->SetInverted(isInverted);
-      break;
-    case kFrontRightMotor:
-      m_frontRightMotor->SetInverted(isInverted);
-      break;
-    case kRearLeftMotor:
-      m_rearLeftMotor->SetInverted(isInverted);
-      break;
-    case kRearRightMotor:
-      m_rearRightMotor->SetInverted(isInverted);
-      break;
-  }
-}
-
-void RobotDrive::SetSensitivity(double sensitivity) {
-  m_sensitivity = sensitivity;
-}
-
-void RobotDrive::SetMaxOutput(double maxOutput) { m_maxOutput = maxOutput; }
-
-void RobotDrive::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "RobotDrive";
-}
-
-void RobotDrive::StopMotor() {
-  if (m_frontLeftMotor != nullptr) m_frontLeftMotor->StopMotor();
-  if (m_frontRightMotor != nullptr) m_frontRightMotor->StopMotor();
-  if (m_rearLeftMotor != nullptr) m_rearLeftMotor->StopMotor();
-  if (m_rearRightMotor != nullptr) m_rearRightMotor->StopMotor();
-  Feed();
-}
-
-void RobotDrive::InitRobotDrive() { SetSafetyEnabled(true); }
-
-double RobotDrive::Limit(double number) {
-  if (number > 1.0) {
-    return 1.0;
-  }
-  if (number < -1.0) {
-    return -1.0;
-  }
-  return number;
-}
-
-void RobotDrive::Normalize(double* wheelSpeeds) {
-  double maxMagnitude = std::fabs(wheelSpeeds[0]);
-  for (int i = 1; i < kMaxNumberOfMotors; i++) {
-    double temp = std::fabs(wheelSpeeds[i]);
-    if (maxMagnitude < temp) maxMagnitude = temp;
-  }
-  if (maxMagnitude > 1.0) {
-    for (int i = 0; i < kMaxNumberOfMotors; i++) {
-      wheelSpeeds[i] = wheelSpeeds[i] / maxMagnitude;
-    }
-  }
-}
-
-void RobotDrive::RotateVector(double& x, double& y, double angle) {
-  double cosA = std::cos(angle * (3.14159 / 180.0));
-  double sinA = std::sin(angle * (3.14159 / 180.0));
-  double xOut = x * cosA - y * sinA;
-  double yOut = x * sinA + y * cosA;
-  x = xOut;
-  y = yOut;
-}
diff --git a/wpilibc/src/main/native/cpp/RobotState.cpp b/wpilibc/src/main/native/cpp/RobotState.cpp
index 530cee3..651a644 100644
--- a/wpilibc/src/main/native/cpp/RobotState.cpp
+++ b/wpilibc/src/main/native/cpp/RobotState.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/RobotState.h"
 
@@ -12,23 +9,29 @@
 using namespace frc;
 
 bool RobotState::IsDisabled() {
-  return DriverStation::GetInstance().IsDisabled();
+  return DriverStation::IsDisabled();
 }
 
 bool RobotState::IsEnabled() {
-  return DriverStation::GetInstance().IsEnabled();
+  return DriverStation::IsEnabled();
 }
 
 bool RobotState::IsEStopped() {
-  return DriverStation::GetInstance().IsEStopped();
+  return DriverStation::IsEStopped();
 }
 
 bool RobotState::IsOperatorControl() {
-  return DriverStation::GetInstance().IsOperatorControl();
+  return IsTeleop();
+}
+
+bool RobotState::IsTeleop() {
+  return DriverStation::IsTeleop();
 }
 
 bool RobotState::IsAutonomous() {
-  return DriverStation::GetInstance().IsAutonomous();
+  return DriverStation::IsAutonomous();
 }
 
-bool RobotState::IsTest() { return DriverStation::GetInstance().IsTest(); }
+bool RobotState::IsTest() {
+  return DriverStation::IsTest();
+}
diff --git a/wpilibc/src/main/native/cpp/SD540.cpp b/wpilibc/src/main/native/cpp/SD540.cpp
deleted file mode 100644
index 9611f66..0000000
--- a/wpilibc/src/main/native/cpp/SD540.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/SD540.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-SD540::SD540(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.05, 1.55, 1.50, 1.44, 0.94);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_MindsensorsSD540,
-             GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "SD540", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/SPI.cpp b/wpilibc/src/main/native/cpp/SPI.cpp
index d51fa3b..bdcee45 100644
--- a/wpilibc/src/main/native/cpp/SPI.cpp
+++ b/wpilibc/src/main/native/cpp/SPI.cpp
@@ -1,13 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/SPI.h"
 
 #include <cstring>
+#include <memory>
 #include <utility>
 
 #include <hal/FRCUsageReporting.h>
@@ -16,8 +14,8 @@
 #include <wpi/mutex.h>
 
 #include "frc/DigitalSource.h"
+#include "frc/Errors.h"
 #include "frc/Notifier.h"
-#include "frc/WPIErrors.h"
 
 using namespace frc;
 
@@ -27,7 +25,7 @@
  public:
   Accumulator(HAL_SPIPort port, int xferSize, int validMask, int validValue,
               int dataShift, int dataSize, bool isSigned, bool bigEndian)
-      : m_notifier([=]() {
+      : m_notifier([=] {
           std::scoped_lock lock(m_mutex);
           Update();
         }),
@@ -79,7 +77,7 @@
     // get amount of data available
     int32_t numToRead =
         HAL_ReadSPIAutoReceivedData(m_port, m_buf, 0, 0, &status);
-    if (status != 0) return;  // error reading
+    FRC_CheckErrorStatus(status, "Port {}", m_port);
 
     // only get whole responses; +1 is for timestamp
     numToRead -= numToRead % m_xferSize;
@@ -87,11 +85,13 @@
       numToRead = m_xferSize * kAccumulateDepth;
       done = false;
     }
-    if (numToRead == 0) return;  // no samples
+    if (numToRead == 0) {
+      return;  // no samples
+    }
 
     // read buffered data
     HAL_ReadSPIAutoReceivedData(m_port, m_buf, numToRead, 0, &status);
-    if (status != 0) return;  // error reading
+    FRC_CheckErrorStatus(status, "Port {}", m_port);
 
     // loop over all responses
     for (int32_t off = 0; off < numToRead; off += m_xferSize) {
@@ -118,7 +118,9 @@
         int32_t data = static_cast<int32_t>(resp >> m_dataShift);
         data &= m_dataMax - 1;
         // 2s complement conversion if signed MSB is set
-        if (m_isSigned && (data & m_dataMsbMask) != 0) data -= m_dataMax;
+        if (m_isSigned && (data & m_dataMsbMask) != 0) {
+          data -= m_dataMax;
+        }
         // center offset
         int32_t dataNoCenter = data;
         data -= m_center;
@@ -127,18 +129,19 @@
           m_value += data;
           if (m_count != 0) {
             // timestamps use the 1us FPGA clock; also handle rollover
-            if (timestamp >= m_lastTimestamp)
+            if (timestamp >= m_lastTimestamp) {
               m_integratedValue +=
                   dataNoCenter *
                       static_cast<int32_t>(timestamp - m_lastTimestamp) * 1e-6 -
                   m_integratedCenter;
-            else
+            } else {
               m_integratedValue +=
                   dataNoCenter *
                       static_cast<int32_t>((1ULL << 32) - m_lastTimestamp +
                                            timestamp) *
                       1e-6 -
                   m_integratedCenter;
+            }
           }
         }
         ++m_count;
@@ -155,15 +158,23 @@
 SPI::SPI(Port port) : m_port(static_cast<HAL_SPIPort>(port)) {
   int32_t status = 0;
   HAL_InitializeSPI(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 
   HAL_Report(HALUsageReporting::kResourceType_SPI,
              static_cast<uint8_t>(port) + 1);
 }
 
-SPI::~SPI() { HAL_CloseSPI(m_port); }
+SPI::~SPI() {
+  HAL_CloseSPI(m_port);
+}
 
-void SPI::SetClockRate(int hz) { HAL_SetSPISpeed(m_port, hz); }
+SPI::Port SPI::GetPort() const {
+  return static_cast<Port>(static_cast<int>(m_port));
+}
+
+void SPI::SetClockRate(int hz) {
+  HAL_SetSPISpeed(m_port, hz);
+}
 
 void SPI::SetMSBFirst() {
   m_msbFirst = true;
@@ -208,13 +219,13 @@
 void SPI::SetChipSelectActiveHigh() {
   int32_t status = 0;
   HAL_SetSPIChipSelectActiveHigh(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::SetChipSelectActiveLow() {
   int32_t status = 0;
   HAL_SetSPIChipSelectActiveLow(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 int SPI::Write(uint8_t* data, int size) {
@@ -244,26 +255,27 @@
 void SPI::InitAuto(int bufferSize) {
   int32_t status = 0;
   HAL_InitSPIAuto(m_port, bufferSize, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::FreeAuto() {
   int32_t status = 0;
   HAL_FreeSPIAuto(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
-void SPI::SetAutoTransmitData(wpi::ArrayRef<uint8_t> dataToSend, int zeroSize) {
+void SPI::SetAutoTransmitData(wpi::span<const uint8_t> dataToSend,
+                              int zeroSize) {
   int32_t status = 0;
   HAL_SetSPIAutoTransmitData(m_port, dataToSend.data(), dataToSend.size(),
                              zeroSize, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::StartAutoRate(units::second_t period) {
   int32_t status = 0;
-  HAL_StartSPIAutoRate(m_port, period.to<double>(), &status);
-  wpi_setHALError(status);
+  HAL_StartSPIAutoRate(m_port, period.value(), &status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::StartAutoRate(double period) {
@@ -272,42 +284,38 @@
 
 void SPI::StartAutoTrigger(DigitalSource& source, bool rising, bool falling) {
   int32_t status = 0;
-  HAL_StartSPIAutoTrigger(
-      m_port, source.GetPortHandleForRouting(),
-      (HAL_AnalogTriggerType)source.GetAnalogTriggerTypeForRouting(), rising,
-      falling, &status);
-  wpi_setHALError(status);
+  HAL_StartSPIAutoTrigger(m_port, source.GetPortHandleForRouting(),
+                          static_cast<HAL_AnalogTriggerType>(
+                              source.GetAnalogTriggerTypeForRouting()),
+                          rising, falling, &status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::StopAuto() {
   int32_t status = 0;
   HAL_StopSPIAuto(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::ForceAutoRead() {
   int32_t status = 0;
   HAL_ForceSPIAutoRead(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 int SPI::ReadAutoReceivedData(uint32_t* buffer, int numToRead,
                               units::second_t timeout) {
   int32_t status = 0;
   int32_t val = HAL_ReadSPIAutoReceivedData(m_port, buffer, numToRead,
-                                            timeout.to<double>(), &status);
-  wpi_setHALError(status);
+                                            timeout.value(), &status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
   return val;
 }
 
-int SPI::ReadAutoReceivedData(uint32_t* buffer, int numToRead, double timeout) {
-  return ReadAutoReceivedData(buffer, numToRead, units::second_t(timeout));
-}
-
 int SPI::GetAutoDroppedCount() {
   int32_t status = 0;
   int32_t val = HAL_GetSPIAutoDroppedCount(m_port, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
   return val;
 }
 
@@ -316,7 +324,7 @@
   int32_t status = 0;
   HAL_ConfigureSPIAutoStall(m_port, csToSclkTicks, stallTicks, pow2BytesPerRead,
                             &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "Port {}", m_port);
 }
 
 void SPI::InitAccumulator(units::second_t period, int cmd, int xferSize,
@@ -341,8 +349,9 @@
   SetAutoTransmitData(cmdBytes, xferSize - 4);
   StartAutoRate(period);
 
-  m_accum.reset(new Accumulator(m_port, xferSize, validMask, validValue,
-                                dataShift, dataSize, isSigned, bigEndian));
+  m_accum =
+      std::make_unique<Accumulator>(m_port, xferSize, validMask, validValue,
+                                    dataShift, dataSize, isSigned, bigEndian);
   m_accum->m_notifier.StartPeriodic(period * kAccumulateDepth / 2);
 }
 
@@ -359,7 +368,9 @@
 }
 
 void SPI::ResetAccumulator() {
-  if (!m_accum) return;
+  if (!m_accum) {
+    return;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->m_value = 0;
   m_accum->m_count = 0;
@@ -369,43 +380,57 @@
 }
 
 void SPI::SetAccumulatorCenter(int center) {
-  if (!m_accum) return;
+  if (!m_accum) {
+    return;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->m_center = center;
 }
 
 void SPI::SetAccumulatorDeadband(int deadband) {
-  if (!m_accum) return;
+  if (!m_accum) {
+    return;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->m_deadband = deadband;
 }
 
 int SPI::GetAccumulatorLastValue() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
   return m_accum->m_lastValue;
 }
 
 int64_t SPI::GetAccumulatorValue() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
   return m_accum->m_value;
 }
 
 int64_t SPI::GetAccumulatorCount() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
   return m_accum->m_count;
 }
 
 double SPI::GetAccumulatorAverage() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
-  if (m_accum->m_count == 0) return 0.0;
+  if (m_accum->m_count == 0) {
+    return 0.0;
+  }
   return static_cast<double>(m_accum->m_value) / m_accum->m_count;
 }
 
@@ -422,23 +447,31 @@
 }
 
 void SPI::SetAccumulatorIntegratedCenter(double center) {
-  if (!m_accum) return;
+  if (!m_accum) {
+    return;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->m_integratedCenter = center;
 }
 
 double SPI::GetAccumulatorIntegratedValue() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
   return m_accum->m_integratedValue;
 }
 
 double SPI::GetAccumulatorIntegratedAverage() const {
-  if (!m_accum) return 0;
+  if (!m_accum) {
+    return 0;
+  }
   std::scoped_lock lock(m_accum->m_mutex);
   m_accum->Update();
-  if (m_accum->m_count <= 1) return 0.0;
+  if (m_accum->m_count <= 1) {
+    return 0.0;
+  }
   // count-1 due to not integrating the first value received
   return m_accum->m_integratedValue / (m_accum->m_count - 1);
 }
diff --git a/wpilibc/src/main/native/cpp/ScopedTracer.cpp b/wpilibc/src/main/native/cpp/ScopedTracer.cpp
index 2024a65..3c8fc80 100644
--- a/wpilibc/src/main/native/cpp/ScopedTracer.cpp
+++ b/wpilibc/src/main/native/cpp/ScopedTracer.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/ScopedTracer.h"
 
@@ -11,8 +8,8 @@
 
 using namespace frc;
 
-ScopedTracer::ScopedTracer(wpi::Twine name, wpi::raw_ostream& os)
-    : m_name(name.str()), m_os(os) {
+ScopedTracer::ScopedTracer(std::string_view name, wpi::raw_ostream& os)
+    : m_name(name), m_os(os) {
   m_tracer.ResetTimer();
 }
 
diff --git a/wpilibc/src/main/native/cpp/SensorUtil.cpp b/wpilibc/src/main/native/cpp/SensorUtil.cpp
index f86c72c..55aacce 100644
--- a/wpilibc/src/main/native/cpp/SensorUtil.cpp
+++ b/wpilibc/src/main/native/cpp/SensorUtil.cpp
@@ -1,36 +1,30 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/SensorUtil.h"
 
 #include <hal/AnalogInput.h>
 #include <hal/AnalogOutput.h>
 #include <hal/DIO.h>
-#include <hal/PDP.h>
 #include <hal/PWM.h>
 #include <hal/Ports.h>
 #include <hal/Relay.h>
-#include <hal/Solenoid.h>
 
 using namespace frc;
 
 const int SensorUtil::kDigitalChannels = HAL_GetNumDigitalChannels();
 const int SensorUtil::kAnalogInputs = HAL_GetNumAnalogInputs();
 const int SensorUtil::kAnalogOutputs = HAL_GetNumAnalogOutputs();
-const int SensorUtil::kSolenoidChannels = HAL_GetNumSolenoidChannels();
-const int SensorUtil::kSolenoidModules = HAL_GetNumPCMModules();
 const int SensorUtil::kPwmChannels = HAL_GetNumPWMChannels();
 const int SensorUtil::kRelayChannels = HAL_GetNumRelayHeaders();
-const int SensorUtil::kPDPChannels = HAL_GetNumPDPChannels();
 
-int SensorUtil::GetDefaultSolenoidModule() { return 0; }
+int SensorUtil::GetDefaultCTREPCMModule() {
+  return 0;
+}
 
-bool SensorUtil::CheckSolenoidModule(int moduleNumber) {
-  return HAL_CheckSolenoidModule(moduleNumber);
+int SensorUtil::GetDefaultREVPHModule() {
+  return 1;
 }
 
 bool SensorUtil::CheckDigitalChannel(int channel) {
@@ -52,15 +46,3 @@
 bool SensorUtil::CheckAnalogOutputChannel(int channel) {
   return HAL_CheckAnalogOutputChannel(channel);
 }
-
-bool SensorUtil::CheckSolenoidChannel(int channel) {
-  return HAL_CheckSolenoidChannel(channel);
-}
-
-bool SensorUtil::CheckPDPChannel(int channel) {
-  return HAL_CheckPDPChannel(channel);
-}
-
-bool SensorUtil::CheckPDPModule(int module) {
-  return HAL_CheckPDPModule(module);
-}
diff --git a/wpilibc/src/main/native/cpp/SerialPort.cpp b/wpilibc/src/main/native/cpp/SerialPort.cpp
index e092fc2..fb984f1 100644
--- a/wpilibc/src/main/native/cpp/SerialPort.cpp
+++ b/wpilibc/src/main/native/cpp/SerialPort.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/SerialPort.h"
 
@@ -12,6 +9,8 @@
 #include <hal/FRCUsageReporting.h>
 #include <hal/SerialPort.h>
 
+#include "frc/Errors.h"
+
 using namespace frc;
 
 SerialPort::SerialPort(int baudRate, Port port, int dataBits,
@@ -21,20 +20,18 @@
 
   m_portHandle =
       HAL_InitializeSerialPort(static_cast<HAL_SerialPort>(port), &status);
-  wpi_setHALError(status);
-  // Don't continue if initialization failed
-  if (status < 0) return;
+  FRC_CheckErrorStatus(status, "Port {}", port);
   HAL_SetSerialBaudRate(m_portHandle, baudRate, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialBaudRate {}", baudRate);
   HAL_SetSerialDataBits(m_portHandle, dataBits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialDataBits {}", dataBits);
   HAL_SetSerialParity(m_portHandle, parity, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialParity {}", parity);
   HAL_SetSerialStopBits(m_portHandle, stopBits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialStopBits {}", stopBits);
 
   // Set the default timeout to 5 seconds.
-  SetTimeout(5.0);
+  SetTimeout(5_s);
 
   // Don't wait until the buffer is full to transmit.
   SetWriteBufferMode(kFlushOnAccess);
@@ -45,30 +42,26 @@
              static_cast<uint8_t>(port) + 1);
 }
 
-SerialPort::SerialPort(int baudRate, const wpi::Twine& portName, Port port,
+SerialPort::SerialPort(int baudRate, std::string_view portName, Port port,
                        int dataBits, SerialPort::Parity parity,
                        SerialPort::StopBits stopBits) {
   int32_t status = 0;
 
-  wpi::SmallVector<char, 64> buf;
-  const char* portNameC = portName.toNullTerminatedStringRef(buf).data();
-
-  m_portHandle = HAL_InitializeSerialPortDirect(
-      static_cast<HAL_SerialPort>(port), portNameC, &status);
-  wpi_setHALError(status);
-  // Don't continue if initialization failed
-  if (status < 0) return;
+  m_portHandle =
+      HAL_InitializeSerialPortDirect(static_cast<HAL_SerialPort>(port),
+                                     std::string(portName).c_str(), &status);
+  FRC_CheckErrorStatus(status, "Port {}", port);
   HAL_SetSerialBaudRate(m_portHandle, baudRate, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialBaudRate {}", baudRate);
   HAL_SetSerialDataBits(m_portHandle, dataBits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialDataBits {}", dataBits);
   HAL_SetSerialParity(m_portHandle, parity, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialParity {}", parity);
   HAL_SetSerialStopBits(m_portHandle, stopBits, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetSerialStopBits {}", stopBits);
 
   // Set the default timeout to 5 seconds.
-  SetTimeout(5.0);
+  SetTimeout(5_s);
 
   // Don't wait until the buffer is full to transmit.
   SetWriteBufferMode(kFlushOnAccess);
@@ -82,85 +75,85 @@
 SerialPort::~SerialPort() {
   int32_t status = 0;
   HAL_CloseSerial(m_portHandle, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "{}", "CloseSerial");
 }
 
 void SerialPort::SetFlowControl(SerialPort::FlowControl flowControl) {
   int32_t status = 0;
   HAL_SetSerialFlowControl(m_portHandle, flowControl, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetFlowControl {}", flowControl);
 }
 
 void SerialPort::EnableTermination(char terminator) {
   int32_t status = 0;
   HAL_EnableSerialTermination(m_portHandle, terminator, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "EnableTermination {}", terminator);
 }
 
 void SerialPort::DisableTermination() {
   int32_t status = 0;
   HAL_DisableSerialTermination(m_portHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "DisableTermination");
 }
 
 int SerialPort::GetBytesReceived() {
   int32_t status = 0;
   int retVal = HAL_GetSerialBytesReceived(m_portHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetBytesReceived");
   return retVal;
 }
 
 int SerialPort::Read(char* buffer, int count) {
   int32_t status = 0;
   int retVal = HAL_ReadSerial(m_portHandle, buffer, count, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Read");
   return retVal;
 }
 
 int SerialPort::Write(const char* buffer, int count) {
-  return Write(wpi::StringRef(buffer, static_cast<size_t>(count)));
+  return Write(std::string_view(buffer, static_cast<size_t>(count)));
 }
 
-int SerialPort::Write(wpi::StringRef buffer) {
+int SerialPort::Write(std::string_view buffer) {
   int32_t status = 0;
   int retVal =
       HAL_WriteSerial(m_portHandle, buffer.data(), buffer.size(), &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Write");
   return retVal;
 }
 
-void SerialPort::SetTimeout(double timeout) {
+void SerialPort::SetTimeout(units::second_t timeout) {
   int32_t status = 0;
-  HAL_SetSerialTimeout(m_portHandle, timeout, &status);
-  wpi_setHALError(status);
+  HAL_SetSerialTimeout(m_portHandle, timeout.value(), &status);
+  FRC_CheckErrorStatus(status, "{}", "SetTimeout");
 }
 
 void SerialPort::SetReadBufferSize(int size) {
   int32_t status = 0;
   HAL_SetSerialReadBufferSize(m_portHandle, size, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetReadBufferSize {}", size);
 }
 
 void SerialPort::SetWriteBufferSize(int size) {
   int32_t status = 0;
   HAL_SetSerialWriteBufferSize(m_portHandle, size, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetWriteBufferSize {}", size);
 }
 
 void SerialPort::SetWriteBufferMode(SerialPort::WriteBufferMode mode) {
   int32_t status = 0;
   HAL_SetSerialWriteMode(m_portHandle, mode, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "SetWriteBufferMode {}", mode);
 }
 
 void SerialPort::Flush() {
   int32_t status = 0;
   HAL_FlushSerial(m_portHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Flush");
 }
 
 void SerialPort::Reset() {
   int32_t status = 0;
   HAL_ClearSerial(m_portHandle, &status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "Reset");
 }
diff --git a/wpilibc/src/main/native/cpp/Servo.cpp b/wpilibc/src/main/native/cpp/Servo.cpp
index 5edcebc..c410bff 100644
--- a/wpilibc/src/main/native/cpp/Servo.cpp
+++ b/wpilibc/src/main/native/cpp/Servo.cpp
@@ -1,16 +1,12 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Servo.h"
 
 #include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 using namespace frc;
 
@@ -28,14 +24,20 @@
   SetPeriodMultiplier(kPeriodMultiplier_4X);
 
   HAL_Report(HALUsageReporting::kResourceType_Servo, channel + 1);
-  SendableRegistry::GetInstance().SetName(this, "Servo", channel);
+  wpi::SendableRegistry::SetName(this, "Servo", channel);
 }
 
-void Servo::Set(double value) { SetPosition(value); }
+void Servo::Set(double value) {
+  SetPosition(value);
+}
 
-void Servo::SetOffline() { SetRaw(0); }
+void Servo::SetOffline() {
+  SetRaw(0);
+}
 
-double Servo::Get() const { return GetPosition(); }
+double Servo::Get() const {
+  return GetPosition();
+}
 
 void Servo::SetAngle(double degrees) {
   if (degrees < kMinServoAngle) {
@@ -51,14 +53,18 @@
   return GetPosition() * GetServoAngleRange() + kMinServoAngle;
 }
 
-double Servo::GetMaxAngle() const { return kMaxServoAngle; }
+double Servo::GetMaxAngle() const {
+  return kMaxServoAngle;
+}
 
-double Servo::GetMinAngle() const { return kMinServoAngle; }
+double Servo::GetMinAngle() const {
+  return kMinServoAngle;
+}
 
-void Servo::InitSendable(SendableBuilder& builder) {
+void Servo::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Servo");
   builder.AddDoubleProperty(
-      "Value", [=]() { return Get(); }, [=](double value) { Set(value); });
+      "Value", [=] { return Get(); }, [=](double value) { Set(value); });
 }
 
 double Servo::GetServoAngleRange() const {
diff --git a/wpilibc/src/main/native/cpp/Solenoid.cpp b/wpilibc/src/main/native/cpp/Solenoid.cpp
index b5abf20..49000c2 100644
--- a/wpilibc/src/main/native/cpp/Solenoid.cpp
+++ b/wpilibc/src/main/native/cpp/Solenoid.cpp
@@ -1,103 +1,81 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Solenoid.h"
 
 #include <utility>
 
 #include <hal/FRCUsageReporting.h>
-#include <hal/HALBase.h>
-#include <hal/Ports.h>
-#include <hal/Solenoid.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/SensorUtil.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
-Solenoid::Solenoid(int channel)
-    : Solenoid(SensorUtil::GetDefaultSolenoidModule(), channel) {}
-
-Solenoid::Solenoid(int moduleNumber, int channel)
-    : SolenoidBase(moduleNumber), m_channel(channel) {
-  if (!SensorUtil::CheckSolenoidModule(m_moduleNumber)) {
-    wpi_setWPIErrorWithContext(ModuleIndexOutOfRange,
-                               "Solenoid Module " + wpi::Twine(m_moduleNumber));
-    return;
+Solenoid::Solenoid(int module, PneumaticsModuleType moduleType, int channel)
+    : m_module{PneumaticsBase::GetForType(module, moduleType)},
+      m_channel{channel} {
+  if (!m_module->CheckSolenoidChannel(m_channel)) {
+    throw FRC_MakeError(err::ChannelIndexOutOfRange, "Channel {}", m_channel);
   }
-  if (!SensorUtil::CheckSolenoidChannel(m_channel)) {
-    wpi_setWPIErrorWithContext(ChannelIndexOutOfRange,
-                               "Solenoid Channel " + wpi::Twine(m_channel));
-    return;
-  }
+  m_mask = 1 << channel;
 
-  int32_t status = 0;
-  m_solenoidHandle = HAL_InitializeSolenoidPort(
-      HAL_GetPortWithModule(moduleNumber, channel), &status);
-  if (status != 0) {
-    wpi_setHALErrorWithRange(status, 0, HAL_GetNumSolenoidChannels(), channel);
-    m_solenoidHandle = HAL_kInvalidHandle;
-    return;
+  if (m_module->CheckAndReserveSolenoids(m_mask) != 0) {
+    throw FRC_MakeError(err::ResourceAlreadyAllocated, "Channel {}", m_channel);
   }
 
   HAL_Report(HALUsageReporting::kResourceType_Solenoid, m_channel + 1,
-             m_moduleNumber + 1);
-  SendableRegistry::GetInstance().AddLW(this, "Solenoid", m_moduleNumber,
-                                        m_channel);
+             m_module->GetModuleNumber() + 1);
+  wpi::SendableRegistry::AddLW(this, "Solenoid", m_module->GetModuleNumber(),
+                               m_channel);
 }
 
-Solenoid::~Solenoid() { HAL_FreeSolenoidPort(m_solenoidHandle); }
+Solenoid::Solenoid(PneumaticsModuleType moduleType, int channel)
+    : Solenoid{PneumaticsBase::GetDefaultForType(moduleType), moduleType,
+               channel} {}
+
+Solenoid::~Solenoid() {
+  m_module->UnreserveSolenoids(m_mask);
+}
 
 void Solenoid::Set(bool on) {
-  if (StatusIsFatal()) return;
-
-  int32_t status = 0;
-  HAL_SetSolenoid(m_solenoidHandle, on, &status);
-  wpi_setHALError(status);
+  int value = on ? (0xFFFF & m_mask) : 0;
+  m_module->SetSolenoids(m_mask, value);
 }
 
 bool Solenoid::Get() const {
-  if (StatusIsFatal()) return false;
-
-  int32_t status = 0;
-  bool value = HAL_GetSolenoid(m_solenoidHandle, &status);
-  wpi_setHALError(status);
-
-  return value;
+  int currentAll = m_module->GetSolenoids();
+  return (currentAll & m_mask) != 0;
 }
 
-void Solenoid::Toggle() { Set(!Get()); }
-
-bool Solenoid::IsBlackListed() const {
-  int value = GetPCMSolenoidBlackList(m_moduleNumber) & (1 << m_channel);
-  return (value != 0);
+void Solenoid::Toggle() {
+  Set(!Get());
 }
 
-void Solenoid::SetPulseDuration(double durationSeconds) {
-  int32_t durationMS = durationSeconds * 1000;
-  if (StatusIsFatal()) return;
-  int32_t status = 0;
-  HAL_SetOneShotDuration(m_solenoidHandle, durationMS, &status);
-  wpi_setHALError(status);
+int Solenoid::GetChannel() const {
+  return m_channel;
+}
+
+bool Solenoid::IsDisabled() const {
+  return (m_module->GetSolenoidDisabledList() & m_mask) != 0;
+}
+
+void Solenoid::SetPulseDuration(units::second_t duration) {
+  m_module->SetOneShotDuration(m_channel, duration);
 }
 
 void Solenoid::StartPulse() {
-  if (StatusIsFatal()) return;
-  int32_t status = 0;
-  HAL_FireOneShot(m_solenoidHandle, &status);
-  wpi_setHALError(status);
+  m_module->FireOneShot(m_channel);
 }
 
-void Solenoid::InitSendable(SendableBuilder& builder) {
+void Solenoid::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Solenoid");
   builder.SetActuator(true);
-  builder.SetSafeState([=]() { Set(false); });
+  builder.SetSafeState([=] { Set(false); });
   builder.AddBooleanProperty(
-      "Value", [=]() { return Get(); }, [=](bool value) { Set(value); });
+      "Value", [=] { return Get(); }, [=](bool value) { Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/SolenoidBase.cpp b/wpilibc/src/main/native/cpp/SolenoidBase.cpp
deleted file mode 100644
index f5f8aad..0000000
--- a/wpilibc/src/main/native/cpp/SolenoidBase.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/SolenoidBase.h"
-
-#include <hal/FRCUsageReporting.h>
-#include <hal/Solenoid.h>
-
-using namespace frc;
-
-int SolenoidBase::GetAll(int module) {
-  int value = 0;
-  int32_t status = 0;
-  value = HAL_GetAllSolenoids(module, &status);
-  wpi_setGlobalHALError(status);
-  return value;
-}
-
-int SolenoidBase::GetAll() const {
-  return SolenoidBase::GetAll(m_moduleNumber);
-}
-
-int SolenoidBase::GetPCMSolenoidBlackList(int module) {
-  int32_t status = 0;
-  return HAL_GetPCMSolenoidBlackList(module, &status);
-}
-
-int SolenoidBase::GetPCMSolenoidBlackList() const {
-  return SolenoidBase::GetPCMSolenoidBlackList(m_moduleNumber);
-}
-
-bool SolenoidBase::GetPCMSolenoidVoltageStickyFault(int module) {
-  int32_t status = 0;
-  return HAL_GetPCMSolenoidVoltageStickyFault(module, &status);
-}
-
-bool SolenoidBase::GetPCMSolenoidVoltageStickyFault() const {
-  return SolenoidBase::GetPCMSolenoidVoltageStickyFault(m_moduleNumber);
-}
-
-bool SolenoidBase::GetPCMSolenoidVoltageFault(int module) {
-  int32_t status = 0;
-  return HAL_GetPCMSolenoidVoltageFault(module, &status);
-}
-
-bool SolenoidBase::GetPCMSolenoidVoltageFault() const {
-  return SolenoidBase::GetPCMSolenoidVoltageFault(m_moduleNumber);
-}
-
-void SolenoidBase::ClearAllPCMStickyFaults(int module) {
-  int32_t status = 0;
-  return HAL_ClearAllPCMStickyFaults(module, &status);
-}
-
-void SolenoidBase::ClearAllPCMStickyFaults() {
-  SolenoidBase::ClearAllPCMStickyFaults(m_moduleNumber);
-}
-
-SolenoidBase::SolenoidBase(int moduleNumber) : m_moduleNumber(moduleNumber) {}
diff --git a/wpilibc/src/main/native/cpp/Spark.cpp b/wpilibc/src/main/native/cpp/Spark.cpp
deleted file mode 100644
index 3717df4..0000000
--- a/wpilibc/src/main/native/cpp/Spark.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Spark.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-Spark::Spark(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.003, 1.55, 1.50, 1.46, 0.999);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_RevSPARK, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "Spark", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/SpeedController.cpp b/wpilibc/src/main/native/cpp/SpeedController.cpp
index cb3cc5b..e0b0cb2 100644
--- a/wpilibc/src/main/native/cpp/SpeedController.cpp
+++ b/wpilibc/src/main/native/cpp/SpeedController.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/SpeedController.h"
 
diff --git a/wpilibc/src/main/native/cpp/SpeedControllerGroup.cpp b/wpilibc/src/main/native/cpp/SpeedControllerGroup.cpp
index 8fea1b2..c3704df 100644
--- a/wpilibc/src/main/native/cpp/SpeedControllerGroup.cpp
+++ b/wpilibc/src/main/native/cpp/SpeedControllerGroup.cpp
@@ -1,14 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/SpeedControllerGroup.h"
 
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 using namespace frc;
 
@@ -22,11 +19,12 @@
 }
 
 void SpeedControllerGroup::Initialize() {
-  for (auto& speedController : m_speedControllers)
-    SendableRegistry::GetInstance().AddChild(this, &speedController.get());
+  for (auto& speedController : m_speedControllers) {
+    wpi::SendableRegistry::AddChild(this, &speedController.get());
+  }
   static int instances = 0;
   ++instances;
-  SendableRegistry::GetInstance().Add(this, "SpeedControllerGroup", instances);
+  wpi::SendableRegistry::Add(this, "SpeedControllerGroup", instances);
 }
 
 void SpeedControllerGroup::Set(double speed) {
@@ -46,7 +44,9 @@
   m_isInverted = isInverted;
 }
 
-bool SpeedControllerGroup::GetInverted() const { return m_isInverted; }
+bool SpeedControllerGroup::GetInverted() const {
+  return m_isInverted;
+}
 
 void SpeedControllerGroup::Disable() {
   for (auto speedController : m_speedControllers) {
@@ -60,12 +60,10 @@
   }
 }
 
-void SpeedControllerGroup::PIDWrite(double output) { Set(output); }
-
-void SpeedControllerGroup::InitSendable(SendableBuilder& builder) {
+void SpeedControllerGroup::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Speed Controller");
   builder.SetActuator(true);
-  builder.SetSafeState([=]() { StopMotor(); });
+  builder.SetSafeState([=] { StopMotor(); });
   builder.AddDoubleProperty(
-      "Value", [=]() { return Get(); }, [=](double value) { Set(value); });
+      "Value", [=] { return Get(); }, [=](double value) { Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/SynchronousInterrupt.cpp b/wpilibc/src/main/native/cpp/SynchronousInterrupt.cpp
new file mode 100644
index 0000000..49acd84
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/SynchronousInterrupt.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/SynchronousInterrupt.h"
+
+#include <type_traits>
+
+#include <hal/Interrupts.h>
+#include <wpi/NullDeleter.h>
+
+#include "frc/DigitalSource.h"
+#include "frc/Errors.h"
+
+using namespace frc;
+
+SynchronousInterrupt::SynchronousInterrupt(DigitalSource& source)
+    : m_source{&source, wpi::NullDeleter<DigitalSource>()} {
+  InitSynchronousInterrupt();
+}
+SynchronousInterrupt::SynchronousInterrupt(DigitalSource* source)
+    : m_source{source, wpi::NullDeleter<DigitalSource>()} {
+  if (m_source == nullptr) {
+    FRC_CheckErrorStatus(frc::err::NullParameter, "{}", "Source is null");
+  } else {
+    InitSynchronousInterrupt();
+  }
+}
+SynchronousInterrupt::SynchronousInterrupt(
+    std::shared_ptr<DigitalSource> source)
+    : m_source{std::move(source)} {
+  if (m_source == nullptr) {
+    FRC_CheckErrorStatus(frc::err::NullParameter, "{}", "Source is null");
+  } else {
+    InitSynchronousInterrupt();
+  }
+}
+
+void SynchronousInterrupt::InitSynchronousInterrupt() {
+  int32_t status = 0;
+  m_handle = HAL_InitializeInterrupts(&status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt failed to initialize");
+  HAL_RequestInterrupts(m_handle, m_source->GetPortHandleForRouting(),
+                        static_cast<HAL_AnalogTriggerType>(
+                            m_source->GetAnalogTriggerTypeForRouting()),
+                        &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt request failed");
+  HAL_SetInterruptUpSourceEdge(m_handle, true, false, &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt setting up source edge failed");
+}
+
+SynchronousInterrupt::~SynchronousInterrupt() {
+  HAL_CleanInterrupts(m_handle);
+}
+
+inline SynchronousInterrupt::WaitResult operator|(
+    SynchronousInterrupt::WaitResult lhs,
+    SynchronousInterrupt::WaitResult rhs) {
+  using T = std::underlying_type_t<SynchronousInterrupt::WaitResult>;
+  return static_cast<SynchronousInterrupt::WaitResult>(static_cast<T>(lhs) |
+                                                       static_cast<T>(rhs));
+}
+
+SynchronousInterrupt::WaitResult SynchronousInterrupt::WaitForInterrupt(
+    units::second_t timeout, bool ignorePrevious) {
+  int32_t status = 0;
+  auto result =
+      HAL_WaitForInterrupt(m_handle, timeout.value(), ignorePrevious, &status);
+
+  auto rising =
+      ((result & 0xFF) != 0) ? WaitResult::kRisingEdge : WaitResult::kTimeout;
+  auto falling = ((result & 0xFF00) != 0) ? WaitResult::kFallingEdge
+                                          : WaitResult::kTimeout;
+
+  return rising | falling;
+}
+
+void SynchronousInterrupt::SetInterruptEdges(bool risingEdge,
+                                             bool fallingEdge) {
+  int32_t status = 0;
+  HAL_SetInterruptUpSourceEdge(m_handle, risingEdge, fallingEdge, &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt setting edges failed");
+}
+
+void SynchronousInterrupt::WakeupWaitingInterrupt() {
+  int32_t status = 0;
+  HAL_ReleaseWaitingInterrupt(m_handle, &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt wakeup failed");
+}
+
+units::second_t SynchronousInterrupt::GetRisingTimestamp() {
+  int32_t status = 0;
+  auto ts = HAL_ReadInterruptRisingTimestamp(m_handle, &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt rising timestamp failed");
+  units::microsecond_t ms{static_cast<double>(ts)};
+  return ms;
+}
+
+units::second_t SynchronousInterrupt::GetFallingTimestamp() {
+  int32_t status = 0;
+  auto ts = HAL_ReadInterruptFallingTimestamp(m_handle, &status);
+  FRC_CheckErrorStatus(status, "{}", "Interrupt falling timestamp failed");
+  units::microsecond_t ms{static_cast<double>(ts)};
+  return ms;
+}
diff --git a/wpilibc/src/main/native/cpp/Talon.cpp b/wpilibc/src/main/native/cpp/Talon.cpp
deleted file mode 100644
index 4807d71..0000000
--- a/wpilibc/src/main/native/cpp/Talon.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Talon.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-Talon::Talon(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.037, 1.539, 1.513, 1.487, 0.989);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_Talon, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "Talon", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/Threads.cpp b/wpilibc/src/main/native/cpp/Threads.cpp
index 7b1e647..2b9c151 100644
--- a/wpilibc/src/main/native/cpp/Threads.cpp
+++ b/wpilibc/src/main/native/cpp/Threads.cpp
@@ -1,16 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Threads.h"
 
 #include <hal/FRCUsageReporting.h>
 #include <hal/Threads.h>
 
-#include "frc/ErrorBase.h"
+#include "frc/Errors.h"
 
 namespace frc {
 
@@ -19,7 +16,7 @@
   HAL_Bool rt = false;
   auto native = thread.native_handle();
   auto ret = HAL_GetThreadPriority(&native, &rt, &status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetThreadPriority");
   *isRealTime = rt;
   return ret;
 }
@@ -28,7 +25,7 @@
   int32_t status = 0;
   HAL_Bool rt = false;
   auto ret = HAL_GetCurrentThreadPriority(&rt, &status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "GetCurrentThreadPriority");
   *isRealTime = rt;
   return ret;
 }
@@ -37,14 +34,14 @@
   int32_t status = 0;
   auto native = thread.native_handle();
   auto ret = HAL_SetThreadPriority(&native, realTime, priority, &status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetThreadPriority");
   return ret;
 }
 
 bool SetCurrentThreadPriority(bool realTime, int priority) {
   int32_t status = 0;
   auto ret = HAL_SetCurrentThreadPriority(realTime, priority, &status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "SetCurrentThreadPriority");
   return ret;
 }
 
diff --git a/wpilibc/src/main/native/cpp/TimedRobot.cpp b/wpilibc/src/main/native/cpp/TimedRobot.cpp
index 74e658a..93e6698 100644
--- a/wpilibc/src/main/native/cpp/TimedRobot.cpp
+++ b/wpilibc/src/main/native/cpp/TimedRobot.cpp
@@ -1,23 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/TimedRobot.h"
 
 #include <stdint.h>
 
+#include <cstdio>
 #include <utility>
 
 #include <hal/DriverStation.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/Notifier.h>
 
+#include "frc/Errors.h"
 #include "frc/Timer.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
 
 using namespace frc;
 
@@ -29,6 +26,7 @@
   }
 
   // Tell the DS that the robot is ready to be enabled
+  std::puts("\n********** Robot program startup complete **********");
   HAL_ObserveUserProgramStarting();
 
   // Loop forever, calling the appropriate mode-dependent function
@@ -42,10 +40,12 @@
     HAL_UpdateNotifierAlarm(
         m_notifier, static_cast<uint64_t>(callback.expirationTime * 1e6),
         &status);
-    wpi_setHALError(status);
+    FRC_CheckErrorStatus(status, "{}", "UpdateNotifierAlarm");
 
     uint64_t curTime = HAL_WaitForNotifierAlarm(m_notifier, &status);
-    if (curTime == 0 || status != 0) break;
+    if (curTime == 0 || status != 0) {
+      break;
+    }
 
     callback.func();
 
@@ -70,19 +70,15 @@
   HAL_StopNotifier(m_notifier, &status);
 }
 
-units::second_t TimedRobot::GetPeriod() const {
-  return units::second_t(m_period);
-}
-
 TimedRobot::TimedRobot(double period) : TimedRobot(units::second_t(period)) {}
 
 TimedRobot::TimedRobot(units::second_t period) : IterativeRobotBase(period) {
-  m_startTime = frc2::Timer::GetFPGATimestamp();
+  m_startTime = Timer::GetFPGATimestamp();
   AddPeriodic([=] { LoopFunc(); }, period);
 
   int32_t status = 0;
   m_notifier = HAL_InitializeNotifier(&status);
-  wpi_setHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "InitializeNotifier");
   HAL_SetNotifierName(m_notifier, "TimedRobot", &status);
 
   HAL_Report(HALUsageReporting::kResourceType_Framework,
@@ -93,7 +89,7 @@
   int32_t status = 0;
 
   HAL_StopNotifier(m_notifier, &status);
-  wpi_setHALError(status);
+  FRC_ReportError(status, "{}", "StopNotifier");
 
   HAL_CleanNotifier(m_notifier, &status);
 }
diff --git a/wpilibc/src/main/native/cpp/Timer.cpp b/wpilibc/src/main/native/cpp/Timer.cpp
index b428e03..bbd2262 100644
--- a/wpilibc/src/main/native/cpp/Timer.cpp
+++ b/wpilibc/src/main/native/cpp/Timer.cpp
@@ -1,42 +1,90 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Timer.h"
 
-#include <units/time.h>
+#include <chrono>
+#include <thread>
+
+#include "frc/DriverStation.h"
+#include "frc/RobotController.h"
 
 namespace frc {
 
-void Wait(double seconds) { frc2::Wait(units::second_t(seconds)); }
+void Wait(units::second_t seconds) {
+  std::this_thread::sleep_for(std::chrono::duration<double>(seconds.value()));
+}
 
-double GetTime() { return frc2::GetTime().to<double>(); }
+units::second_t GetTime() {
+  using std::chrono::duration;
+  using std::chrono::duration_cast;
+  using std::chrono::system_clock;
+
+  return units::second_t(
+      duration_cast<duration<double>>(system_clock::now().time_since_epoch())
+          .count());
+}
 
 }  // namespace frc
 
 using namespace frc;
 
-Timer::Timer() { Reset(); }
-
-double Timer::Get() const { return m_timer.Get().to<double>(); }
-
-void Timer::Reset() { m_timer.Reset(); }
-
-void Timer::Start() { m_timer.Start(); }
-
-void Timer::Stop() { m_timer.Stop(); }
-
-bool Timer::HasPeriodPassed(double period) {
-  return m_timer.HasPeriodPassed(units::second_t(period));
+Timer::Timer() {
+  Reset();
 }
 
-double Timer::GetFPGATimestamp() {
-  return frc2::Timer::GetFPGATimestamp().to<double>();
+units::second_t Timer::Get() const {
+  if (m_running) {
+    return (GetFPGATimestamp() - m_startTime) + m_accumulatedTime;
+  } else {
+    return m_accumulatedTime;
+  }
 }
 
-double Timer::GetMatchTime() {
-  return frc2::Timer::GetMatchTime().to<double>();
+void Timer::Reset() {
+  m_accumulatedTime = 0_s;
+  m_startTime = GetFPGATimestamp();
+}
+
+void Timer::Start() {
+  if (!m_running) {
+    m_startTime = GetFPGATimestamp();
+    m_running = true;
+  }
+}
+
+void Timer::Stop() {
+  if (m_running) {
+    m_accumulatedTime = Get();
+    m_running = false;
+  }
+}
+
+bool Timer::HasElapsed(units::second_t period) const {
+  return Get() >= period;
+}
+
+bool Timer::HasPeriodPassed(units::second_t period) {
+  return AdvanceIfElapsed(period);
+}
+
+bool Timer::AdvanceIfElapsed(units::second_t period) {
+  if (Get() >= period) {
+    // Advance the start time by the period.
+    m_startTime += period;
+    // Don't set it to the current time... we want to avoid drift.
+    return true;
+  } else {
+    return false;
+  }
+}
+
+units::second_t Timer::GetFPGATimestamp() {
+  // FPGA returns the timestamp in microseconds
+  return units::second_t(frc::RobotController::GetFPGATime() * 1.0e-6);
+}
+
+units::second_t Timer::GetMatchTime() {
+  return units::second_t(frc::DriverStation::GetMatchTime());
 }
diff --git a/wpilibc/src/main/native/cpp/TimesliceRobot.cpp b/wpilibc/src/main/native/cpp/TimesliceRobot.cpp
new file mode 100644
index 0000000..d212c10
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/TimesliceRobot.cpp
@@ -0,0 +1,28 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/TimesliceRobot.h"
+
+#include "frc/Errors.h"
+#include "frc/fmt/Units.h"
+
+using namespace frc;
+
+TimesliceRobot::TimesliceRobot(units::second_t robotPeriodicAllocation,
+                               units::second_t controllerPeriod)
+    : m_nextOffset{robotPeriodicAllocation},
+      m_controllerPeriod{controllerPeriod} {}
+
+void TimesliceRobot::Schedule(std::function<void()> func,
+                              units::second_t allocation) {
+  if (m_nextOffset + allocation > m_controllerPeriod) {
+    throw FRC_MakeError(err::Error,
+                        "Function scheduled at offset {} with allocation {} "
+                        "exceeded controller period of {}\n",
+                        m_nextOffset, allocation, m_controllerPeriod);
+  }
+
+  AddPeriodic(func, m_controllerPeriod, m_nextOffset);
+  m_nextOffset += allocation;
+}
diff --git a/wpilibc/src/main/native/cpp/Tracer.cpp b/wpilibc/src/main/native/cpp/Tracer.cpp
index af5177a..1375411 100644
--- a/wpilibc/src/main/native/cpp/Tracer.cpp
+++ b/wpilibc/src/main/native/cpp/Tracer.cpp
@@ -1,30 +1,31 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Tracer.h"
 
-#include <wpi/Format.h>
+#include <fmt/format.h>
 #include <wpi/SmallString.h>
 #include <wpi/raw_ostream.h>
 
-#include "frc/DriverStation.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 
-Tracer::Tracer() { ResetTimer(); }
+Tracer::Tracer() {
+  ResetTimer();
+}
 
-void Tracer::ResetTimer() { m_startTime = hal::fpga_clock::now(); }
+void Tracer::ResetTimer() {
+  m_startTime = hal::fpga_clock::now();
+}
 
 void Tracer::ClearEpochs() {
   ResetTimer();
   m_epochs.clear();
 }
 
-void Tracer::AddEpoch(wpi::StringRef epochName) {
+void Tracer::AddEpoch(std::string_view epochName) {
   auto currentTime = hal::fpga_clock::now();
   m_epochs[epochName] = currentTime - m_startTime;
   m_startTime = currentTime;
@@ -34,7 +35,9 @@
   wpi::SmallString<128> buf;
   wpi::raw_svector_ostream os(buf);
   PrintEpochs(os);
-  if (!buf.empty()) DriverStation::ReportWarning(buf);
+  if (!buf.empty()) {
+    FRC_ReportError(warn::Warning, "{}", buf.c_str());
+  }
 }
 
 void Tracer::PrintEpochs(wpi::raw_ostream& os) {
@@ -45,11 +48,9 @@
   if (now - m_lastEpochsPrintTime > kMinPrintPeriod) {
     m_lastEpochsPrintTime = now;
     for (const auto& epoch : m_epochs) {
-      os << '\t' << epoch.getKey() << ": "
-         << wpi::format(
-                "%.6f",
-                duration_cast<microseconds>(epoch.getValue()).count() / 1.0e6)
-         << "s\n";
+      os << fmt::format(
+          "\t{}: {:.6f}s\n", epoch.getKey(),
+          duration_cast<microseconds>(epoch.getValue()).count() / 1.0e6);
     }
   }
 }
diff --git a/wpilibc/src/main/native/cpp/Ultrasonic.cpp b/wpilibc/src/main/native/cpp/Ultrasonic.cpp
index dbd0d13..02035dd 100644
--- a/wpilibc/src/main/native/cpp/Ultrasonic.cpp
+++ b/wpilibc/src/main/native/cpp/Ultrasonic.cpp
@@ -1,23 +1,21 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Ultrasonic.h"
 
-#include <hal/FRCUsageReporting.h>
+#include <utility>
 
-#include "frc/Base.h"
+#include <hal/FRCUsageReporting.h>
+#include <wpi/NullDeleter.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
 #include "frc/Counter.h"
 #include "frc/DigitalInput.h"
 #include "frc/DigitalOutput.h"
+#include "frc/Errors.h"
 #include "frc/Timer.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
@@ -27,47 +25,40 @@
 std::vector<Ultrasonic*> Ultrasonic::m_sensors;
 std::thread Ultrasonic::m_thread;
 
-Ultrasonic::Ultrasonic(int pingChannel, int echoChannel, DistanceUnit units)
+Ultrasonic::Ultrasonic(int pingChannel, int echoChannel)
     : m_pingChannel(std::make_shared<DigitalOutput>(pingChannel)),
       m_echoChannel(std::make_shared<DigitalInput>(echoChannel)),
       m_counter(m_echoChannel) {
-  m_units = units;
   Initialize();
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, m_pingChannel.get());
-  registry.AddChild(this, m_echoChannel.get());
+  wpi::SendableRegistry::AddChild(this, m_pingChannel.get());
+  wpi::SendableRegistry::AddChild(this, m_echoChannel.get());
 }
 
-Ultrasonic::Ultrasonic(DigitalOutput* pingChannel, DigitalInput* echoChannel,
-                       DistanceUnit units)
-    : m_pingChannel(pingChannel, NullDeleter<DigitalOutput>()),
-      m_echoChannel(echoChannel, NullDeleter<DigitalInput>()),
+Ultrasonic::Ultrasonic(DigitalOutput* pingChannel, DigitalInput* echoChannel)
+    : m_pingChannel(pingChannel, wpi::NullDeleter<DigitalOutput>()),
+      m_echoChannel(echoChannel, wpi::NullDeleter<DigitalInput>()),
       m_counter(m_echoChannel) {
-  if (pingChannel == nullptr || echoChannel == nullptr) {
-    wpi_setWPIError(NullParameter);
-    m_units = units;
-    return;
+  if (!pingChannel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "pingChannel");
   }
-  m_units = units;
+  if (!echoChannel) {
+    throw FRC_MakeError(err::NullParameter, "{}", "echoChannel");
+  }
   Initialize();
 }
 
-Ultrasonic::Ultrasonic(DigitalOutput& pingChannel, DigitalInput& echoChannel,
-                       DistanceUnit units)
-    : m_pingChannel(&pingChannel, NullDeleter<DigitalOutput>()),
-      m_echoChannel(&echoChannel, NullDeleter<DigitalInput>()),
+Ultrasonic::Ultrasonic(DigitalOutput& pingChannel, DigitalInput& echoChannel)
+    : m_pingChannel(&pingChannel, wpi::NullDeleter<DigitalOutput>()),
+      m_echoChannel(&echoChannel, wpi::NullDeleter<DigitalInput>()),
       m_counter(m_echoChannel) {
-  m_units = units;
   Initialize();
 }
 
 Ultrasonic::Ultrasonic(std::shared_ptr<DigitalOutput> pingChannel,
-                       std::shared_ptr<DigitalInput> echoChannel,
-                       DistanceUnit units)
-    : m_pingChannel(pingChannel),
-      m_echoChannel(echoChannel),
+                       std::shared_ptr<DigitalInput> echoChannel)
+    : m_pingChannel(std::move(pingChannel)),
+      m_echoChannel(std::move(echoChannel)),
       m_counter(m_echoChannel) {
-  m_units = units;
   Initialize();
 }
 
@@ -89,8 +80,15 @@
   }
 }
 
+int Ultrasonic::GetEchoChannel() const {
+  return m_echoChannel->GetChannel();
+}
+
 void Ultrasonic::Ping() {
-  wpi_assert(!m_automaticEnabled);
+  if (m_automaticEnabled) {
+    throw FRC_MakeError(err::IncompatibleMode, "{}",
+                        "cannot call Ping() in automatic mode");
+  }
 
   // Reset the counter to zero (invalid data now)
   m_counter.Reset();
@@ -100,12 +98,16 @@
 }
 
 bool Ultrasonic::IsRangeValid() const {
-  if (m_simRangeValid) return m_simRangeValid.Get();
+  if (m_simRangeValid) {
+    return m_simRangeValid.Get();
+  }
   return m_counter.Get() > 1;
 }
 
 void Ultrasonic::SetAutomaticMode(bool enabling) {
-  if (enabling == m_automaticEnabled) return;  // ignore the case of no change
+  if (enabling == m_automaticEnabled) {
+    return;  // ignore the case of no change
+  }
 
   m_automaticEnabled = enabling;
 
@@ -138,48 +140,29 @@
   }
 }
 
-double Ultrasonic::GetRangeInches() const {
+units::meter_t Ultrasonic::GetRange() const {
   if (IsRangeValid()) {
-    if (m_simRange) return m_simRange.Get();
-    return m_counter.GetPeriod() * kSpeedOfSoundInchesPerSec / 2.0;
+    if (m_simRange) {
+      return units::meter_t{m_simRange.Get()};
+    }
+    return m_counter.GetPeriod() * kSpeedOfSound / 2.0;
   } else {
-    return 0;
+    return 0_m;
   }
 }
 
-double Ultrasonic::GetRangeMM() const { return GetRangeInches() * 25.4; }
-
-bool Ultrasonic::IsEnabled() const { return m_enabled; }
-
-void Ultrasonic::SetEnabled(bool enable) { m_enabled = enable; }
-
-void Ultrasonic::SetDistanceUnits(DistanceUnit units) { m_units = units; }
-
-Ultrasonic::DistanceUnit Ultrasonic::GetDistanceUnits() const {
-  return m_units;
+bool Ultrasonic::IsEnabled() const {
+  return m_enabled;
 }
 
-double Ultrasonic::PIDGet() {
-  switch (m_units) {
-    case Ultrasonic::kInches:
-      return GetRangeInches();
-    case Ultrasonic::kMilliMeters:
-      return GetRangeMM();
-    default:
-      return 0.0;
-  }
+void Ultrasonic::SetEnabled(bool enable) {
+  m_enabled = enable;
 }
 
-void Ultrasonic::SetPIDSourceType(PIDSourceType pidSource) {
-  if (wpi_assert(pidSource == PIDSourceType::kDisplacement)) {
-    m_pidSource = pidSource;
-  }
-}
-
-void Ultrasonic::InitSendable(SendableBuilder& builder) {
+void Ultrasonic::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("Ultrasonic");
   builder.AddDoubleProperty(
-      "Value", [=]() { return GetRangeInches(); }, nullptr);
+      "Value", [=] { return units::inch_t{GetRange()}.value(); }, nullptr);
 }
 
 void Ultrasonic::Initialize() {
@@ -196,7 +179,7 @@
   // Link this instance on the list
   m_sensors.emplace_back(this);
 
-  m_counter.SetMaxPeriod(1.0);
+  m_counter.SetMaxPeriod(1_s);
   m_counter.SetSemiPeriodMode(true);
   m_counter.Reset();
   m_enabled = true;  // Make it available for round robin scheduling
@@ -205,20 +188,21 @@
   static int instances = 0;
   instances++;
   HAL_Report(HALUsageReporting::kResourceType_Ultrasonic, instances);
-  SendableRegistry::GetInstance().AddLW(this, "Ultrasonic",
-                                        m_echoChannel->GetChannel());
+  wpi::SendableRegistry::AddLW(this, "Ultrasonic", m_echoChannel->GetChannel());
 }
 
 void Ultrasonic::UltrasonicChecker() {
   while (m_automaticEnabled) {
     for (auto& sensor : m_sensors) {
-      if (!m_automaticEnabled) break;
+      if (!m_automaticEnabled) {
+        break;
+      }
 
       if (sensor->IsEnabled()) {
         sensor->m_pingChannel->Pulse(kPingTime);  // do the ping
       }
 
-      Wait(0.1);  // wait for ping to return
+      Wait(100_ms);  // wait for ping to return
     }
   }
 }
diff --git a/wpilibc/src/main/native/cpp/Utility.cpp b/wpilibc/src/main/native/cpp/Utility.cpp
deleted file mode 100644
index 4b69cc8..0000000
--- a/wpilibc/src/main/native/cpp/Utility.cpp
+++ /dev/null
@@ -1,112 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Utility.h"
-
-#ifndef _WIN32
-#include <cxxabi.h>
-#include <execinfo.h>
-#endif
-
-#include <frc/Base.h>
-#include <hal/DriverStation.h>
-#include <wpi/Path.h>
-#include <wpi/SmallString.h>
-#include <wpi/StackTrace.h>
-#include <wpi/raw_ostream.h>
-
-using namespace frc;
-
-bool wpi_assert_impl(bool conditionValue, const wpi::Twine& conditionText,
-                     const wpi::Twine& message, wpi::StringRef fileName,
-                     int lineNumber, wpi::StringRef funcName) {
-  if (!conditionValue) {
-    wpi::SmallString<128> locBuf;
-    wpi::raw_svector_ostream locStream(locBuf);
-    locStream << funcName << " [" << wpi::sys::path::filename(fileName) << ":"
-              << lineNumber << "]";
-
-    wpi::SmallString<128> errorBuf;
-    wpi::raw_svector_ostream errorStream(errorBuf);
-
-    errorStream << "Assertion \"" << conditionText << "\" ";
-
-    if (message.isTriviallyEmpty() ||
-        (message.isSingleStringRef() && message.getSingleStringRef().empty())) {
-      errorStream << "failed.\n";
-    } else {
-      errorStream << "failed: " << message << "\n";
-    }
-
-    std::string stack = wpi::GetStackTrace(2);
-
-    // Print the error and send it to the DriverStation
-    HAL_SendError(1, 1, 0, errorBuf.c_str(), locBuf.c_str(), stack.c_str(), 1);
-  }
-
-  return conditionValue;
-}
-
-/**
- * Common error routines for wpi_assertEqual_impl and wpi_assertNotEqual_impl.
- *
- * This should not be called directly; it should only be used by
- * wpi_assertEqual_impl and wpi_assertNotEqual_impl.
- */
-void wpi_assertEqual_common_impl(const wpi::Twine& valueA,
-                                 const wpi::Twine& valueB,
-                                 const wpi::Twine& equalityType,
-                                 const wpi::Twine& message,
-                                 wpi::StringRef fileName, int lineNumber,
-                                 wpi::StringRef funcName) {
-  wpi::SmallString<128> locBuf;
-  wpi::raw_svector_ostream locStream(locBuf);
-  locStream << funcName << " [" << wpi::sys::path::filename(fileName) << ":"
-            << lineNumber << "]";
-
-  wpi::SmallString<128> errorBuf;
-  wpi::raw_svector_ostream errorStream(errorBuf);
-
-  errorStream << "Assertion \"" << valueA << " " << equalityType << " "
-              << valueB << "\" ";
-
-  if (message.isTriviallyEmpty() ||
-      (message.isSingleStringRef() && message.getSingleStringRef().empty())) {
-    errorStream << "failed.\n";
-  } else {
-    errorStream << "failed: " << message << "\n";
-  }
-
-  std::string trace = wpi::GetStackTrace(3);
-
-  // Print the error and send it to the DriverStation
-  HAL_SendError(1, 1, 0, errorBuf.c_str(), locBuf.c_str(), trace.c_str(), 1);
-}
-
-bool wpi_assertEqual_impl(int valueA, int valueB,
-                          const wpi::Twine& valueAString,
-                          const wpi::Twine& valueBString,
-                          const wpi::Twine& message, wpi::StringRef fileName,
-                          int lineNumber, wpi::StringRef funcName) {
-  if (!(valueA == valueB)) {
-    wpi_assertEqual_common_impl(valueAString, valueBString, "==", message,
-                                fileName, lineNumber, funcName);
-  }
-  return valueA == valueB;
-}
-
-bool wpi_assertNotEqual_impl(int valueA, int valueB,
-                             const wpi::Twine& valueAString,
-                             const wpi::Twine& valueBString,
-                             const wpi::Twine& message, wpi::StringRef fileName,
-                             int lineNumber, wpi::StringRef funcName) {
-  if (!(valueA != valueB)) {
-    wpi_assertEqual_common_impl(valueAString, valueBString, "!=", message,
-                                fileName, lineNumber, funcName);
-  }
-  return valueA != valueB;
-}
diff --git a/wpilibc/src/main/native/cpp/Victor.cpp b/wpilibc/src/main/native/cpp/Victor.cpp
deleted file mode 100644
index bce1913..0000000
--- a/wpilibc/src/main/native/cpp/Victor.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/Victor.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-Victor::Victor(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.027, 1.525, 1.507, 1.49, 1.026);
-  SetPeriodMultiplier(kPeriodMultiplier_2X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_Victor, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "Victor", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/VictorSP.cpp b/wpilibc/src/main/native/cpp/VictorSP.cpp
deleted file mode 100644
index 221777d..0000000
--- a/wpilibc/src/main/native/cpp/VictorSP.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/VictorSP.h"
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-VictorSP::VictorSP(int channel) : PWMSpeedController(channel) {
-  SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
-  SetPeriodMultiplier(kPeriodMultiplier_1X);
-  SetSpeed(0.0);
-  SetZeroLatch();
-
-  HAL_Report(HALUsageReporting::kResourceType_VictorSP, GetChannel() + 1);
-  SendableRegistry::GetInstance().SetName(this, "VictorSP", GetChannel());
-}
diff --git a/wpilibc/src/main/native/cpp/Watchdog.cpp b/wpilibc/src/main/native/cpp/Watchdog.cpp
index 81c7cc8..854f9e9 100644
--- a/wpilibc/src/main/native/cpp/Watchdog.cpp
+++ b/wpilibc/src/main/native/cpp/Watchdog.cpp
@@ -1,22 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/Watchdog.h"
 
 #include <atomic>
+#include <thread>
+#include <utility>
 
+#include <fmt/format.h>
 #include <hal/Notifier.h>
-#include <wpi/Format.h>
-#include <wpi/SmallString.h>
+#include <wpi/mutex.h>
 #include <wpi/priority_queue.h>
-#include <wpi/raw_ostream.h>
 
-#include "frc/DriverStation.h"
-#include "frc2/Timer.h"
+#include "frc/Errors.h"
+#include "frc/Timer.h"
 
 using namespace frc;
 
@@ -49,7 +47,7 @@
 Watchdog::Impl::Impl() {
   int32_t status = 0;
   m_notifier = HAL_InitializeNotifier(&status);
-  wpi_setGlobalHALError(status);
+  FRC_CheckErrorStatus(status, "{}", "starting watchdog notifier");
   HAL_SetNotifierName(m_notifier, "Watchdog", &status);
 
   m_thread = std::thread([=] { Main(); });
@@ -60,10 +58,12 @@
   // atomically set handle to 0, then clean
   HAL_NotifierHandle handle = m_notifier.exchange(0);
   HAL_StopNotifier(handle, &status);
-  wpi_setGlobalHALError(status);
+  FRC_ReportError(status, "{}", "stopping watchdog notifier");
 
   // Join the thread to ensure the handler has exited.
-  if (m_thread.joinable()) m_thread.join();
+  if (m_thread.joinable()) {
+    m_thread.join();
+  }
 
   HAL_CleanNotifier(handle, &status);
 }
@@ -72,29 +72,38 @@
   int32_t status = 0;
   // Return if we are being destructed, or were not created successfully
   auto notifier = m_notifier.load();
-  if (notifier == 0) return;
-  if (m_watchdogs.empty())
+  if (notifier == 0) {
+    return;
+  }
+  if (m_watchdogs.empty()) {
     HAL_CancelNotifierAlarm(notifier, &status);
-  else
+  } else {
     HAL_UpdateNotifierAlarm(
         notifier,
-        static_cast<uint64_t>(m_watchdogs.top()->m_expirationTime.to<double>() *
+        static_cast<uint64_t>(m_watchdogs.top()->m_expirationTime.value() *
                               1e6),
         &status);
-  wpi_setGlobalHALError(status);
+  }
+  FRC_CheckErrorStatus(status, "{}", "updating watchdog notifier alarm");
 }
 
 void Watchdog::Impl::Main() {
   for (;;) {
     int32_t status = 0;
     HAL_NotifierHandle notifier = m_notifier.load();
-    if (notifier == 0) break;
+    if (notifier == 0) {
+      break;
+    }
     uint64_t curTime = HAL_WaitForNotifierAlarm(notifier, &status);
-    if (curTime == 0 || status != 0) break;
+    if (curTime == 0 || status != 0) {
+      break;
+    }
 
     std::unique_lock lock(m_mutex);
 
-    if (m_watchdogs.empty()) continue;
+    if (m_watchdogs.empty()) {
+      continue;
+    }
 
     // If the condition variable timed out, that means a Watchdog timeout
     // has occurred, so call its timeout function.
@@ -104,11 +113,8 @@
     if (now - watchdog->m_lastTimeoutPrintTime > kMinPrintPeriod) {
       watchdog->m_lastTimeoutPrintTime = now;
       if (!watchdog->m_suppressTimeoutMessage) {
-        wpi::SmallString<128> buf;
-        wpi::raw_svector_ostream err(buf);
-        err << "Watchdog not fed within "
-            << wpi::format("%.6f", watchdog->m_timeout.to<double>()) << "s\n";
-        frc::DriverStation::ReportWarning(err.str());
+        FRC_ReportError(warn::Warning, "Watchdog not fed within {:.6f}s",
+                        watchdog->m_timeout.value());
       }
     }
 
@@ -125,15 +131,20 @@
   }
 }
 
-Watchdog::Watchdog(double timeout, std::function<void()> callback)
-    : Watchdog(units::second_t{timeout}, callback) {}
-
 Watchdog::Watchdog(units::second_t timeout, std::function<void()> callback)
-    : m_timeout(timeout), m_callback(callback), m_impl(GetImpl()) {}
+    : m_timeout(timeout), m_callback(std::move(callback)), m_impl(GetImpl()) {}
 
-Watchdog::~Watchdog() { Disable(); }
+Watchdog::~Watchdog() {
+  try {
+    Disable();
+  } catch (const RuntimeError& e) {
+    e.Report();
+  }
+}
 
-Watchdog::Watchdog(Watchdog&& rhs) { *this = std::move(rhs); }
+Watchdog::Watchdog(Watchdog&& rhs) {
+  *this = std::move(rhs);
+}
 
 Watchdog& Watchdog::operator=(Watchdog&& rhs) {
   m_impl = rhs.m_impl;
@@ -153,16 +164,12 @@
   return *this;
 }
 
-double Watchdog::GetTime() const {
-  return (frc2::Timer::GetFPGATimestamp() - m_startTime).to<double>();
-}
-
-void Watchdog::SetTimeout(double timeout) {
-  SetTimeout(units::second_t{timeout});
+units::second_t Watchdog::GetTime() const {
+  return Timer::GetFPGATimestamp() - m_startTime;
 }
 
 void Watchdog::SetTimeout(units::second_t timeout) {
-  m_startTime = frc2::Timer::GetFPGATimestamp();
+  m_startTime = Timer::GetFPGATimestamp();
   m_tracer.ClearEpochs();
 
   std::scoped_lock lock(m_impl->m_mutex);
@@ -175,9 +182,9 @@
   m_impl->UpdateAlarm();
 }
 
-double Watchdog::GetTimeout() const {
+units::second_t Watchdog::GetTimeout() const {
   std::scoped_lock lock(m_impl->m_mutex);
-  return m_timeout.to<double>();
+  return m_timeout;
 }
 
 bool Watchdog::IsExpired() const {
@@ -185,16 +192,20 @@
   return m_isExpired;
 }
 
-void Watchdog::AddEpoch(wpi::StringRef epochName) {
+void Watchdog::AddEpoch(std::string_view epochName) {
   m_tracer.AddEpoch(epochName);
 }
 
-void Watchdog::PrintEpochs() { m_tracer.PrintEpochs(); }
+void Watchdog::PrintEpochs() {
+  m_tracer.PrintEpochs();
+}
 
-void Watchdog::Reset() { Enable(); }
+void Watchdog::Reset() {
+  Enable();
+}
 
 void Watchdog::Enable() {
-  m_startTime = frc2::Timer::GetFPGATimestamp();
+  m_startTime = Timer::GetFPGATimestamp();
   m_tracer.ClearEpochs();
 
   std::scoped_lock lock(m_impl->m_mutex);
diff --git a/wpilibc/src/main/native/cpp/XboxController.cpp b/wpilibc/src/main/native/cpp/XboxController.cpp
index de77624..a08225b 100644
--- a/wpilibc/src/main/native/cpp/XboxController.cpp
+++ b/wpilibc/src/main/native/cpp/XboxController.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/XboxController.h"
 
@@ -15,146 +12,146 @@
   HAL_Report(HALUsageReporting::kResourceType_XboxController, port + 1);
 }
 
-double XboxController::GetX(JoystickHand hand) const {
-  if (hand == kLeftHand) {
-    return GetRawAxis(static_cast<int>(Axis::kLeftX));
-  } else {
-    return GetRawAxis(static_cast<int>(Axis::kRightX));
-  }
+double XboxController::GetLeftX() const {
+  return GetRawAxis(Axis::kLeftX);
 }
 
-double XboxController::GetY(JoystickHand hand) const {
-  if (hand == kLeftHand) {
-    return GetRawAxis(static_cast<int>(Axis::kLeftY));
-  } else {
-    return GetRawAxis(static_cast<int>(Axis::kRightY));
-  }
+double XboxController::GetRightX() const {
+  return GetRawAxis(Axis::kRightX);
 }
 
-double XboxController::GetTriggerAxis(JoystickHand hand) const {
-  if (hand == kLeftHand) {
-    return GetRawAxis(static_cast<int>(Axis::kLeftTrigger));
-  } else {
-    return GetRawAxis(static_cast<int>(Axis::kRightTrigger));
-  }
+double XboxController::GetLeftY() const {
+  return GetRawAxis(Axis::kLeftY);
 }
 
-bool XboxController::GetBumper(JoystickHand hand) const {
-  if (hand == kLeftHand) {
-    return GetRawButton(static_cast<int>(Button::kBumperLeft));
-  } else {
-    return GetRawButton(static_cast<int>(Button::kBumperRight));
-  }
+double XboxController::GetRightY() const {
+  return GetRawAxis(Axis::kRightY);
 }
 
-bool XboxController::GetBumperPressed(JoystickHand hand) {
-  if (hand == kLeftHand) {
-    return GetRawButtonPressed(static_cast<int>(Button::kBumperLeft));
-  } else {
-    return GetRawButtonPressed(static_cast<int>(Button::kBumperRight));
-  }
+double XboxController::GetLeftTriggerAxis() const {
+  return GetRawAxis(Axis::kLeftTrigger);
 }
 
-bool XboxController::GetBumperReleased(JoystickHand hand) {
-  if (hand == kLeftHand) {
-    return GetRawButtonReleased(static_cast<int>(Button::kBumperLeft));
-  } else {
-    return GetRawButtonReleased(static_cast<int>(Button::kBumperRight));
-  }
+double XboxController::GetRightTriggerAxis() const {
+  return GetRawAxis(Axis::kRightTrigger);
 }
 
-bool XboxController::GetStickButton(JoystickHand hand) const {
-  if (hand == kLeftHand) {
-    return GetRawButton(static_cast<int>(Button::kStickLeft));
-  } else {
-    return GetRawButton(static_cast<int>(Button::kStickRight));
-  }
+bool XboxController::GetLeftBumper() const {
+  return GetRawButton(Button::kLeftBumper);
 }
 
-bool XboxController::GetStickButtonPressed(JoystickHand hand) {
-  if (hand == kLeftHand) {
-    return GetRawButtonPressed(static_cast<int>(Button::kStickLeft));
-  } else {
-    return GetRawButtonPressed(static_cast<int>(Button::kStickRight));
-  }
+bool XboxController::GetRightBumper() const {
+  return GetRawButton(Button::kRightBumper);
 }
 
-bool XboxController::GetStickButtonReleased(JoystickHand hand) {
-  if (hand == kLeftHand) {
-    return GetRawButtonReleased(static_cast<int>(Button::kStickLeft));
-  } else {
-    return GetRawButtonReleased(static_cast<int>(Button::kStickRight));
-  }
+bool XboxController::GetLeftBumperPressed() {
+  return GetRawButtonPressed(Button::kLeftBumper);
+}
+
+bool XboxController::GetRightBumperPressed() {
+  return GetRawButtonPressed(Button::kRightBumper);
+}
+
+bool XboxController::GetLeftBumperReleased() {
+  return GetRawButtonReleased(Button::kLeftBumper);
+}
+
+bool XboxController::GetRightBumperReleased() {
+  return GetRawButtonReleased(Button::kRightBumper);
+}
+
+bool XboxController::GetLeftStickButton() const {
+  return GetRawButton(Button::kLeftStick);
+}
+
+bool XboxController::GetRightStickButton() const {
+  return GetRawButton(Button::kRightStick);
+}
+
+bool XboxController::GetLeftStickButtonPressed() {
+  return GetRawButtonPressed(Button::kLeftStick);
+}
+
+bool XboxController::GetRightStickButtonPressed() {
+  return GetRawButtonPressed(Button::kRightStick);
+}
+
+bool XboxController::GetLeftStickButtonReleased() {
+  return GetRawButtonReleased(Button::kLeftStick);
+}
+
+bool XboxController::GetRightStickButtonReleased() {
+  return GetRawButtonReleased(Button::kRightStick);
 }
 
 bool XboxController::GetAButton() const {
-  return GetRawButton(static_cast<int>(Button::kA));
+  return GetRawButton(Button::kA);
 }
 
 bool XboxController::GetAButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kA));
+  return GetRawButtonPressed(Button::kA);
 }
 
 bool XboxController::GetAButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kA));
+  return GetRawButtonReleased(Button::kA);
 }
 
 bool XboxController::GetBButton() const {
-  return GetRawButton(static_cast<int>(Button::kB));
+  return GetRawButton(Button::kB);
 }
 
 bool XboxController::GetBButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kB));
+  return GetRawButtonPressed(Button::kB);
 }
 
 bool XboxController::GetBButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kB));
+  return GetRawButtonReleased(Button::kB);
 }
 
 bool XboxController::GetXButton() const {
-  return GetRawButton(static_cast<int>(Button::kX));
+  return GetRawButton(Button::kX);
 }
 
 bool XboxController::GetXButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kX));
+  return GetRawButtonPressed(Button::kX);
 }
 
 bool XboxController::GetXButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kX));
+  return GetRawButtonReleased(Button::kX);
 }
 
 bool XboxController::GetYButton() const {
-  return GetRawButton(static_cast<int>(Button::kY));
+  return GetRawButton(Button::kY);
 }
 
 bool XboxController::GetYButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kY));
+  return GetRawButtonPressed(Button::kY);
 }
 
 bool XboxController::GetYButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kY));
+  return GetRawButtonReleased(Button::kY);
 }
 
 bool XboxController::GetBackButton() const {
-  return GetRawButton(static_cast<int>(Button::kBack));
+  return GetRawButton(Button::kBack);
 }
 
 bool XboxController::GetBackButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kBack));
+  return GetRawButtonPressed(Button::kBack);
 }
 
 bool XboxController::GetBackButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kBack));
+  return GetRawButtonReleased(Button::kBack);
 }
 
 bool XboxController::GetStartButton() const {
-  return GetRawButton(static_cast<int>(Button::kStart));
+  return GetRawButton(Button::kStart);
 }
 
 bool XboxController::GetStartButtonPressed() {
-  return GetRawButtonPressed(static_cast<int>(Button::kStart));
+  return GetRawButtonPressed(Button::kStart);
 }
 
 bool XboxController::GetStartButtonReleased() {
-  return GetRawButtonReleased(static_cast<int>(Button::kStart));
+  return GetRawButtonReleased(Button::kStart);
 }
diff --git a/wpilibc/src/main/native/cpp/controller/HolonomicDriveController.cpp b/wpilibc/src/main/native/cpp/controller/HolonomicDriveController.cpp
deleted file mode 100644
index 7482e22..0000000
--- a/wpilibc/src/main/native/cpp/controller/HolonomicDriveController.cpp
+++ /dev/null
@@ -1,70 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/controller/HolonomicDriveController.h"
-
-#include <units/angular_velocity.h>
-
-using namespace frc;
-
-HolonomicDriveController::HolonomicDriveController(
-    const frc2::PIDController& xController,
-    const frc2::PIDController& yController,
-    const ProfiledPIDController<units::radian>& thetaController)
-    : m_xController(xController),
-      m_yController(yController),
-      m_thetaController(thetaController) {}
-
-bool HolonomicDriveController::AtReference() const {
-  const auto& eTranslate = m_poseError.Translation();
-  const auto& eRotate = m_poseError.Rotation();
-  const auto& tolTranslate = m_poseTolerance.Translation();
-  const auto& tolRotate = m_poseTolerance.Rotation();
-  return units::math::abs(eTranslate.X()) < tolTranslate.X() &&
-         units::math::abs(eTranslate.Y()) < tolTranslate.Y() &&
-         units::math::abs(eRotate.Radians()) < tolRotate.Radians();
-}
-
-void HolonomicDriveController::SetTolerance(const Pose2d& tolerance) {
-  m_poseTolerance = tolerance;
-}
-
-ChassisSpeeds HolonomicDriveController::Calculate(
-    const Pose2d& currentPose, const Pose2d& poseRef,
-    units::meters_per_second_t linearVelocityRef, const Rotation2d& angleRef) {
-  // Calculate feedforward velocities (field-relative)
-  auto xFF = linearVelocityRef * poseRef.Rotation().Cos();
-  auto yFF = linearVelocityRef * poseRef.Rotation().Sin();
-  auto thetaFF = units::radians_per_second_t(m_thetaController.Calculate(
-      currentPose.Rotation().Radians(), angleRef.Radians()));
-
-  m_poseError = poseRef.RelativeTo(currentPose);
-
-  if (!m_enabled) {
-    return ChassisSpeeds::FromFieldRelativeSpeeds(xFF, yFF, thetaFF,
-                                                  currentPose.Rotation());
-  }
-
-  // Calculate feedback velocities (based on position error).
-  auto xFeedback = units::meters_per_second_t(m_xController.Calculate(
-      currentPose.X().to<double>(), poseRef.X().to<double>()));
-  auto yFeedback = units::meters_per_second_t(m_yController.Calculate(
-      currentPose.Y().to<double>(), poseRef.Y().to<double>()));
-
-  // Return next output.
-  return ChassisSpeeds::FromFieldRelativeSpeeds(
-      xFF + xFeedback, yFF + yFeedback, thetaFF, currentPose.Rotation());
-}
-
-ChassisSpeeds HolonomicDriveController::Calculate(
-    const Pose2d& currentPose, const Trajectory::State& desiredState,
-    const Rotation2d& angleRef) {
-  return Calculate(currentPose, desiredState.pose, desiredState.velocity,
-                   angleRef);
-}
-
-void HolonomicDriveController::SetEnabled(bool enabled) { m_enabled = enabled; }
diff --git a/wpilibc/src/main/native/cpp/controller/PIDController.cpp b/wpilibc/src/main/native/cpp/controller/PIDController.cpp
deleted file mode 100644
index 7b9b623..0000000
--- a/wpilibc/src/main/native/cpp/controller/PIDController.cpp
+++ /dev/null
@@ -1,131 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/controller/PIDController.h"
-
-#include <algorithm>
-#include <cmath>
-
-#include <hal/FRCUsageReporting.h>
-
-#include "frc/controller/ControllerUtil.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc2;
-
-PIDController::PIDController(double Kp, double Ki, double Kd,
-                             units::second_t period)
-    : m_Kp(Kp), m_Ki(Ki), m_Kd(Kd), m_period(period) {
-  static int instances = 0;
-  instances++;
-  HAL_Report(HALUsageReporting::kResourceType_PIDController2, instances);
-  frc::SendableRegistry::GetInstance().Add(this, "PIDController", instances);
-}
-
-void PIDController::SetPID(double Kp, double Ki, double Kd) {
-  m_Kp = Kp;
-  m_Ki = Ki;
-  m_Kd = Kd;
-}
-
-void PIDController::SetP(double Kp) { m_Kp = Kp; }
-
-void PIDController::SetI(double Ki) { m_Ki = Ki; }
-
-void PIDController::SetD(double Kd) { m_Kd = Kd; }
-
-double PIDController::GetP() const { return m_Kp; }
-
-double PIDController::GetI() const { return m_Ki; }
-
-double PIDController::GetD() const { return m_Kd; }
-
-units::second_t PIDController::GetPeriod() const {
-  return units::second_t(m_period);
-}
-
-void PIDController::SetSetpoint(double setpoint) { m_setpoint = setpoint; }
-
-double PIDController::GetSetpoint() const { return m_setpoint; }
-
-bool PIDController::AtSetpoint() const {
-  return std::abs(m_positionError) < m_positionTolerance &&
-         std::abs(m_velocityError) < m_velocityTolerance;
-}
-
-void PIDController::EnableContinuousInput(double minimumInput,
-                                          double maximumInput) {
-  m_continuous = true;
-  m_minimumInput = minimumInput;
-  m_maximumInput = maximumInput;
-}
-
-void PIDController::DisableContinuousInput() { m_continuous = false; }
-
-bool PIDController::IsContinuousInputEnabled() const { return m_continuous; }
-
-void PIDController::SetIntegratorRange(double minimumIntegral,
-                                       double maximumIntegral) {
-  m_minimumIntegral = minimumIntegral;
-  m_maximumIntegral = maximumIntegral;
-}
-
-void PIDController::SetTolerance(double positionTolerance,
-                                 double velocityTolerance) {
-  m_positionTolerance = positionTolerance;
-  m_velocityTolerance = velocityTolerance;
-}
-
-double PIDController::GetPositionError() const { return m_positionError; }
-
-double PIDController::GetVelocityError() const { return m_velocityError; }
-
-double PIDController::Calculate(double measurement) {
-  m_prevError = m_positionError;
-
-  if (m_continuous) {
-    m_positionError = frc::GetModulusError<double>(
-        m_setpoint, measurement, m_minimumInput, m_maximumInput);
-  } else {
-    m_positionError = m_setpoint - measurement;
-  }
-
-  m_velocityError = (m_positionError - m_prevError) / m_period.to<double>();
-
-  if (m_Ki != 0) {
-    m_totalError =
-        std::clamp(m_totalError + m_positionError * m_period.to<double>(),
-                   m_minimumIntegral / m_Ki, m_maximumIntegral / m_Ki);
-  }
-
-  return m_Kp * m_positionError + m_Ki * m_totalError + m_Kd * m_velocityError;
-}
-
-double PIDController::Calculate(double measurement, double setpoint) {
-  // Set setpoint to provided value
-  SetSetpoint(setpoint);
-  return Calculate(measurement);
-}
-
-void PIDController::Reset() {
-  m_prevError = 0;
-  m_totalError = 0;
-}
-
-void PIDController::InitSendable(frc::SendableBuilder& builder) {
-  builder.SetSmartDashboardType("PIDController");
-  builder.AddDoubleProperty(
-      "p", [this] { return GetP(); }, [this](double value) { SetP(value); });
-  builder.AddDoubleProperty(
-      "i", [this] { return GetI(); }, [this](double value) { SetI(value); });
-  builder.AddDoubleProperty(
-      "d", [this] { return GetD(); }, [this](double value) { SetD(value); });
-  builder.AddDoubleProperty(
-      "setpoint", [this] { return GetSetpoint(); },
-      [this](double value) { SetSetpoint(value); });
-}
diff --git a/wpilibc/src/main/native/cpp/controller/ProfiledPIDController.cpp b/wpilibc/src/main/native/cpp/controller/ProfiledPIDController.cpp
deleted file mode 100644
index a0fffc6..0000000
--- a/wpilibc/src/main/native/cpp/controller/ProfiledPIDController.cpp
+++ /dev/null
@@ -1,16 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/controller/ProfiledPIDController.h"
-
-#include <hal/FRCUsageReporting.h>
-
-void frc::detail::ReportProfiledPIDController() {
-  static int instances = 0;
-  ++instances;
-  HAL_Report(HALUsageReporting::kResourceType_ProfiledPIDController, instances);
-}
diff --git a/wpilibc/src/main/native/cpp/controller/RamseteController.cpp b/wpilibc/src/main/native/cpp/controller/RamseteController.cpp
deleted file mode 100644
index aad6937..0000000
--- a/wpilibc/src/main/native/cpp/controller/RamseteController.cpp
+++ /dev/null
@@ -1,78 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/controller/RamseteController.h"
-
-#include <cmath>
-
-#include <units/math.h>
-
-using namespace frc;
-
-/**
- * Returns sin(x) / x.
- *
- * @param x Value of which to take sinc(x).
- */
-static double Sinc(double x) {
-  if (std::abs(x) < 1e-9) {
-    return 1.0 - 1.0 / 6.0 * x * x;
-  } else {
-    return std::sin(x) / x;
-  }
-}
-
-RamseteController::RamseteController(double b, double zeta)
-    : m_b{b}, m_zeta{zeta} {}
-
-bool RamseteController::AtReference() const {
-  const auto& eTranslate = m_poseError.Translation();
-  const auto& eRotate = m_poseError.Rotation();
-  const auto& tolTranslate = m_poseTolerance.Translation();
-  const auto& tolRotate = m_poseTolerance.Rotation();
-  return units::math::abs(eTranslate.X()) < tolTranslate.X() &&
-         units::math::abs(eTranslate.Y()) < tolTranslate.Y() &&
-         units::math::abs(eRotate.Radians()) < tolRotate.Radians();
-}
-
-void RamseteController::SetTolerance(const Pose2d& poseTolerance) {
-  m_poseTolerance = poseTolerance;
-}
-
-ChassisSpeeds RamseteController::Calculate(
-    const Pose2d& currentPose, const Pose2d& poseRef,
-    units::meters_per_second_t linearVelocityRef,
-    units::radians_per_second_t angularVelocityRef) {
-  if (!m_enabled) {
-    return ChassisSpeeds{linearVelocityRef, 0_mps, angularVelocityRef};
-  }
-
-  m_poseError = poseRef.RelativeTo(currentPose);
-
-  // Aliases for equation readability
-  double eX = m_poseError.X().to<double>();
-  double eY = m_poseError.Y().to<double>();
-  double eTheta = m_poseError.Rotation().Radians().to<double>();
-  double vRef = linearVelocityRef.to<double>();
-  double omegaRef = angularVelocityRef.to<double>();
-
-  double k =
-      2.0 * m_zeta * std::sqrt(std::pow(omegaRef, 2) + m_b * std::pow(vRef, 2));
-
-  units::meters_per_second_t v{vRef * m_poseError.Rotation().Cos() + k * eX};
-  units::radians_per_second_t omega{omegaRef + k * eTheta +
-                                    m_b * vRef * Sinc(eTheta) * eY};
-  return ChassisSpeeds{v, 0_mps, omega};
-}
-
-ChassisSpeeds RamseteController::Calculate(
-    const Pose2d& currentPose, const Trajectory::State& desiredState) {
-  return Calculate(currentPose, desiredState.pose, desiredState.velocity,
-                   desiredState.velocity * desiredState.curvature);
-}
-
-void RamseteController::SetEnabled(bool enabled) { m_enabled = enabled; }
diff --git a/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp b/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp
index ce9aa05..b54b607 100644
--- a/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp
+++ b/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/drive/DifferentialDrive.h"
 
@@ -11,22 +8,30 @@
 #include <cmath>
 
 #include <hal/FRCUsageReporting.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/MathUtil.h"
 #include "frc/SpeedController.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
+#if defined(_MSC_VER)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 DifferentialDrive::DifferentialDrive(SpeedController& leftMotor,
                                      SpeedController& rightMotor)
     : m_leftMotor(&leftMotor), m_rightMotor(&rightMotor) {
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, m_leftMotor);
-  registry.AddChild(this, m_rightMotor);
+  wpi::SendableRegistry::AddChild(this, m_leftMotor);
+  wpi::SendableRegistry::AddChild(this, m_rightMotor);
   static int instances = 0;
   ++instances;
-  registry.AddLW(this, "DifferentialDrive", instances);
+  wpi::SendableRegistry::AddLW(this, "DifferentialDrive", instances);
 }
 
 void DifferentialDrive::ArcadeDrive(double xSpeed, double zRotation,
@@ -38,54 +43,19 @@
     reported = true;
   }
 
-  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
   xSpeed = ApplyDeadband(xSpeed, m_deadband);
-
-  zRotation = std::clamp(zRotation, -1.0, 1.0);
   zRotation = ApplyDeadband(zRotation, m_deadband);
 
-  // Square the inputs (while preserving the sign) to increase fine control
-  // while permitting full power.
-  if (squareInputs) {
-    xSpeed = std::copysign(xSpeed * xSpeed, xSpeed);
-    zRotation = std::copysign(zRotation * zRotation, zRotation);
-  }
+  auto [left, right] = ArcadeDriveIK(xSpeed, zRotation, squareInputs);
 
-  double leftMotorOutput;
-  double rightMotorOutput;
-
-  double maxInput =
-      std::copysign(std::max(std::abs(xSpeed), std::abs(zRotation)), xSpeed);
-
-  if (xSpeed >= 0.0) {
-    // First quadrant, else second quadrant
-    if (zRotation >= 0.0) {
-      leftMotorOutput = maxInput;
-      rightMotorOutput = xSpeed - zRotation;
-    } else {
-      leftMotorOutput = xSpeed + zRotation;
-      rightMotorOutput = maxInput;
-    }
-  } else {
-    // Third quadrant, else fourth quadrant
-    if (zRotation >= 0.0) {
-      leftMotorOutput = xSpeed + zRotation;
-      rightMotorOutput = maxInput;
-    } else {
-      leftMotorOutput = maxInput;
-      rightMotorOutput = xSpeed - zRotation;
-    }
-  }
-
-  m_leftMotor->Set(std::clamp(leftMotorOutput, -1.0, 1.0) * m_maxOutput);
-  double maxOutput = m_maxOutput * m_rightSideInvertMultiplier;
-  m_rightMotor->Set(std::clamp(rightMotorOutput, -1.0, 1.0) * maxOutput);
+  m_leftMotor->Set(left);
+  m_rightMotor->Set(right);
 
   Feed();
 }
 
 void DifferentialDrive::CurvatureDrive(double xSpeed, double zRotation,
-                                       bool isQuickTurn) {
+                                       bool allowTurnInPlace) {
   static bool reported = false;
   if (!reported) {
     HAL_Report(HALUsageReporting::kResourceType_RobotDrive,
@@ -93,67 +63,13 @@
     reported = true;
   }
 
-  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
   xSpeed = ApplyDeadband(xSpeed, m_deadband);
-
-  zRotation = std::clamp(zRotation, -1.0, 1.0);
   zRotation = ApplyDeadband(zRotation, m_deadband);
 
-  double angularPower;
-  bool overPower;
+  auto [left, right] = CurvatureDriveIK(xSpeed, zRotation, allowTurnInPlace);
 
-  if (isQuickTurn) {
-    if (std::abs(xSpeed) < m_quickStopThreshold) {
-      m_quickStopAccumulator =
-          (1 - m_quickStopAlpha) * m_quickStopAccumulator +
-          m_quickStopAlpha * std::clamp(zRotation, -1.0, 1.0) * 2;
-    }
-    overPower = true;
-    angularPower = zRotation;
-  } else {
-    overPower = false;
-    angularPower = std::abs(xSpeed) * zRotation - m_quickStopAccumulator;
-
-    if (m_quickStopAccumulator > 1) {
-      m_quickStopAccumulator -= 1;
-    } else if (m_quickStopAccumulator < -1) {
-      m_quickStopAccumulator += 1;
-    } else {
-      m_quickStopAccumulator = 0.0;
-    }
-  }
-
-  double leftMotorOutput = xSpeed + angularPower;
-  double rightMotorOutput = xSpeed - angularPower;
-
-  // If rotation is overpowered, reduce both outputs to within acceptable range
-  if (overPower) {
-    if (leftMotorOutput > 1.0) {
-      rightMotorOutput -= leftMotorOutput - 1.0;
-      leftMotorOutput = 1.0;
-    } else if (rightMotorOutput > 1.0) {
-      leftMotorOutput -= rightMotorOutput - 1.0;
-      rightMotorOutput = 1.0;
-    } else if (leftMotorOutput < -1.0) {
-      rightMotorOutput -= leftMotorOutput + 1.0;
-      leftMotorOutput = -1.0;
-    } else if (rightMotorOutput < -1.0) {
-      leftMotorOutput -= rightMotorOutput + 1.0;
-      rightMotorOutput = -1.0;
-    }
-  }
-
-  // Normalize the wheel speeds
-  double maxMagnitude =
-      std::max(std::abs(leftMotorOutput), std::abs(rightMotorOutput));
-  if (maxMagnitude > 1.0) {
-    leftMotorOutput /= maxMagnitude;
-    rightMotorOutput /= maxMagnitude;
-  }
-
-  m_leftMotor->Set(leftMotorOutput * m_maxOutput);
-  m_rightMotor->Set(rightMotorOutput * m_maxOutput *
-                    m_rightSideInvertMultiplier);
+  m_leftMotor->Set(left * m_maxOutput);
+  m_rightMotor->Set(right * m_maxOutput);
 
   Feed();
 }
@@ -167,12 +83,96 @@
     reported = true;
   }
 
-  leftSpeed = std::clamp(leftSpeed, -1.0, 1.0);
   leftSpeed = ApplyDeadband(leftSpeed, m_deadband);
-
-  rightSpeed = std::clamp(rightSpeed, -1.0, 1.0);
   rightSpeed = ApplyDeadband(rightSpeed, m_deadband);
 
+  auto [left, right] = TankDriveIK(leftSpeed, rightSpeed, squareInputs);
+
+  m_leftMotor->Set(left * m_maxOutput);
+  m_rightMotor->Set(right * m_maxOutput);
+
+  Feed();
+}
+
+DifferentialDrive::WheelSpeeds DifferentialDrive::ArcadeDriveIK(
+    double xSpeed, double zRotation, bool squareInputs) {
+  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
+  zRotation = std::clamp(zRotation, -1.0, 1.0);
+
+  // Square the inputs (while preserving the sign) to increase fine control
+  // while permitting full power.
+  if (squareInputs) {
+    xSpeed = std::copysign(xSpeed * xSpeed, xSpeed);
+    zRotation = std::copysign(zRotation * zRotation, zRotation);
+  }
+
+  double leftSpeed;
+  double rightSpeed;
+
+  double maxInput =
+      std::copysign(std::max(std::abs(xSpeed), std::abs(zRotation)), xSpeed);
+
+  if (xSpeed >= 0.0) {
+    // First quadrant, else second quadrant
+    if (zRotation >= 0.0) {
+      leftSpeed = maxInput;
+      rightSpeed = xSpeed - zRotation;
+    } else {
+      leftSpeed = xSpeed + zRotation;
+      rightSpeed = maxInput;
+    }
+  } else {
+    // Third quadrant, else fourth quadrant
+    if (zRotation >= 0.0) {
+      leftSpeed = xSpeed + zRotation;
+      rightSpeed = maxInput;
+    } else {
+      leftSpeed = maxInput;
+      rightSpeed = xSpeed - zRotation;
+    }
+  }
+
+  // Normalize the wheel speeds
+  double maxMagnitude = std::max(std::abs(leftSpeed), std::abs(rightSpeed));
+  if (maxMagnitude > 1.0) {
+    leftSpeed /= maxMagnitude;
+    rightSpeed /= maxMagnitude;
+  }
+
+  return {leftSpeed, rightSpeed};
+}
+
+DifferentialDrive::WheelSpeeds DifferentialDrive::CurvatureDriveIK(
+    double xSpeed, double zRotation, bool allowTurnInPlace) {
+  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
+  zRotation = std::clamp(zRotation, -1.0, 1.0);
+
+  double leftSpeed = 0.0;
+  double rightSpeed = 0.0;
+
+  if (allowTurnInPlace) {
+    leftSpeed = xSpeed + zRotation;
+    rightSpeed = xSpeed - zRotation;
+  } else {
+    leftSpeed = xSpeed + std::abs(xSpeed) * zRotation;
+    rightSpeed = xSpeed - std::abs(xSpeed) * zRotation;
+  }
+
+  // Normalize wheel speeds
+  double maxMagnitude = std::max(std::abs(leftSpeed), std::abs(rightSpeed));
+  if (maxMagnitude > 1.0) {
+    leftSpeed /= maxMagnitude;
+    rightSpeed /= maxMagnitude;
+  }
+
+  return {leftSpeed, rightSpeed};
+}
+
+DifferentialDrive::WheelSpeeds DifferentialDrive::TankDriveIK(
+    double leftSpeed, double rightSpeed, bool squareInputs) {
+  leftSpeed = std::clamp(leftSpeed, -1.0, 1.0);
+  rightSpeed = std::clamp(rightSpeed, -1.0, 1.0);
+
   // Square the inputs (while preserving the sign) to increase fine control
   // while permitting full power.
   if (squareInputs) {
@@ -180,26 +180,7 @@
     rightSpeed = std::copysign(rightSpeed * rightSpeed, rightSpeed);
   }
 
-  m_leftMotor->Set(leftSpeed * m_maxOutput);
-  m_rightMotor->Set(rightSpeed * m_maxOutput * m_rightSideInvertMultiplier);
-
-  Feed();
-}
-
-void DifferentialDrive::SetQuickStopThreshold(double threshold) {
-  m_quickStopThreshold = threshold;
-}
-
-void DifferentialDrive::SetQuickStopAlpha(double alpha) {
-  m_quickStopAlpha = alpha;
-}
-
-bool DifferentialDrive::IsRightSideInverted() const {
-  return m_rightSideInvertMultiplier == -1.0;
-}
-
-void DifferentialDrive::SetRightSideInverted(bool rightSideInverted) {
-  m_rightSideInvertMultiplier = rightSideInverted ? -1.0 : 1.0;
+  return {leftSpeed, rightSpeed};
 }
 
 void DifferentialDrive::StopMotor() {
@@ -208,21 +189,18 @@
   Feed();
 }
 
-void DifferentialDrive::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "DifferentialDrive";
+std::string DifferentialDrive::GetDescription() const {
+  return "DifferentialDrive";
 }
 
-void DifferentialDrive::InitSendable(SendableBuilder& builder) {
+void DifferentialDrive::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("DifferentialDrive");
   builder.SetActuator(true);
   builder.SetSafeState([=] { StopMotor(); });
   builder.AddDoubleProperty(
-      "Left Motor Speed", [=]() { return m_leftMotor->Get(); },
+      "Left Motor Speed", [=] { return m_leftMotor->Get(); },
       [=](double value) { m_leftMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Right Motor Speed",
-      [=]() { return m_rightMotor->Get() * m_rightSideInvertMultiplier; },
-      [=](double value) {
-        m_rightMotor->Set(value * m_rightSideInvertMultiplier);
-      });
+      "Right Motor Speed", [=] { return m_rightMotor->Get(); },
+      [=](double value) { m_rightMotor->Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/drive/KilloughDrive.cpp b/wpilibc/src/main/native/cpp/drive/KilloughDrive.cpp
index 983ce6a..c847678 100644
--- a/wpilibc/src/main/native/cpp/drive/KilloughDrive.cpp
+++ b/wpilibc/src/main/native/cpp/drive/KilloughDrive.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/drive/KilloughDrive.h"
 
@@ -11,14 +8,23 @@
 #include <cmath>
 
 #include <hal/FRCUsageReporting.h>
-#include <wpi/math>
+#include <wpi/numbers>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/MathUtil.h"
 #include "frc/SpeedController.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
+#if defined(_MSC_VER)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 KilloughDrive::KilloughDrive(SpeedController& leftMotor,
                              SpeedController& rightMotor,
                              SpeedController& backMotor)
@@ -32,19 +38,18 @@
     : m_leftMotor(&leftMotor),
       m_rightMotor(&rightMotor),
       m_backMotor(&backMotor) {
-  m_leftVec = {std::cos(leftMotorAngle * (wpi::math::pi / 180.0)),
-               std::sin(leftMotorAngle * (wpi::math::pi / 180.0))};
-  m_rightVec = {std::cos(rightMotorAngle * (wpi::math::pi / 180.0)),
-                std::sin(rightMotorAngle * (wpi::math::pi / 180.0))};
-  m_backVec = {std::cos(backMotorAngle * (wpi::math::pi / 180.0)),
-               std::sin(backMotorAngle * (wpi::math::pi / 180.0))};
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, m_leftMotor);
-  registry.AddChild(this, m_rightMotor);
-  registry.AddChild(this, m_backMotor);
+  m_leftVec = {std::cos(leftMotorAngle * (wpi::numbers::pi / 180.0)),
+               std::sin(leftMotorAngle * (wpi::numbers::pi / 180.0))};
+  m_rightVec = {std::cos(rightMotorAngle * (wpi::numbers::pi / 180.0)),
+                std::sin(rightMotorAngle * (wpi::numbers::pi / 180.0))};
+  m_backVec = {std::cos(backMotorAngle * (wpi::numbers::pi / 180.0)),
+               std::sin(backMotorAngle * (wpi::numbers::pi / 180.0))};
+  wpi::SendableRegistry::AddChild(this, m_leftMotor);
+  wpi::SendableRegistry::AddChild(this, m_rightMotor);
+  wpi::SendableRegistry::AddChild(this, m_backMotor);
   static int instances = 0;
   ++instances;
-  registry.AddLW(this, "KilloughDrive", instances);
+  wpi::SendableRegistry::AddLW(this, "KilloughDrive", instances);
 }
 
 void KilloughDrive::DriveCartesian(double ySpeed, double xSpeed,
@@ -55,26 +60,15 @@
     reported = true;
   }
 
-  ySpeed = std::clamp(ySpeed, -1.0, 1.0);
   ySpeed = ApplyDeadband(ySpeed, m_deadband);
-
-  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
   xSpeed = ApplyDeadband(xSpeed, m_deadband);
 
-  // Compensate for gyro angle.
-  Vector2d input{ySpeed, xSpeed};
-  input.Rotate(-gyroAngle);
+  auto [left, right, back] =
+      DriveCartesianIK(ySpeed, xSpeed, zRotation, gyroAngle);
 
-  double wheelSpeeds[3];
-  wheelSpeeds[kLeft] = input.ScalarProject(m_leftVec) + zRotation;
-  wheelSpeeds[kRight] = input.ScalarProject(m_rightVec) + zRotation;
-  wheelSpeeds[kBack] = input.ScalarProject(m_backVec) + zRotation;
-
-  Normalize(wheelSpeeds);
-
-  m_leftMotor->Set(wheelSpeeds[kLeft] * m_maxOutput);
-  m_rightMotor->Set(wheelSpeeds[kRight] * m_maxOutput);
-  m_backMotor->Set(wheelSpeeds[kBack] * m_maxOutput);
+  m_leftMotor->Set(left * m_maxOutput);
+  m_rightMotor->Set(right * m_maxOutput);
+  m_backMotor->Set(back * m_maxOutput);
 
   Feed();
 }
@@ -87,11 +81,32 @@
     reported = true;
   }
 
-  DriveCartesian(magnitude * std::sin(angle * (wpi::math::pi / 180.0)),
-                 magnitude * std::cos(angle * (wpi::math::pi / 180.0)),
+  DriveCartesian(magnitude * std::sin(angle * (wpi::numbers::pi / 180.0)),
+                 magnitude * std::cos(angle * (wpi::numbers::pi / 180.0)),
                  zRotation, 0.0);
 }
 
+KilloughDrive::WheelSpeeds KilloughDrive::DriveCartesianIK(double ySpeed,
+                                                           double xSpeed,
+                                                           double zRotation,
+                                                           double gyroAngle) {
+  ySpeed = std::clamp(ySpeed, -1.0, 1.0);
+  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
+
+  // Compensate for gyro angle.
+  Vector2d input{ySpeed, xSpeed};
+  input.Rotate(-gyroAngle);
+
+  double wheelSpeeds[3];
+  wheelSpeeds[kLeft] = input.ScalarProject(m_leftVec) + zRotation;
+  wheelSpeeds[kRight] = input.ScalarProject(m_rightVec) + zRotation;
+  wheelSpeeds[kBack] = input.ScalarProject(m_backVec) + zRotation;
+
+  Normalize(wheelSpeeds);
+
+  return {wheelSpeeds[kLeft], wheelSpeeds[kRight], wheelSpeeds[kBack]};
+}
+
 void KilloughDrive::StopMotor() {
   m_leftMotor->StopMotor();
   m_rightMotor->StopMotor();
@@ -99,21 +114,21 @@
   Feed();
 }
 
-void KilloughDrive::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "KilloughDrive";
+std::string KilloughDrive::GetDescription() const {
+  return "KilloughDrive";
 }
 
-void KilloughDrive::InitSendable(SendableBuilder& builder) {
+void KilloughDrive::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("KilloughDrive");
   builder.SetActuator(true);
   builder.SetSafeState([=] { StopMotor(); });
   builder.AddDoubleProperty(
-      "Left Motor Speed", [=]() { return m_leftMotor->Get(); },
+      "Left Motor Speed", [=] { return m_leftMotor->Get(); },
       [=](double value) { m_leftMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Right Motor Speed", [=]() { return m_rightMotor->Get(); },
+      "Right Motor Speed", [=] { return m_rightMotor->Get(); },
       [=](double value) { m_rightMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Back Motor Speed", [=]() { return m_backMotor->Get(); },
+      "Back Motor Speed", [=] { return m_backMotor->Get(); },
       [=](double value) { m_backMotor->Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/drive/MecanumDrive.cpp b/wpilibc/src/main/native/cpp/drive/MecanumDrive.cpp
index cb11d8a..b74c611 100644
--- a/wpilibc/src/main/native/cpp/drive/MecanumDrive.cpp
+++ b/wpilibc/src/main/native/cpp/drive/MecanumDrive.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/drive/MecanumDrive.h"
 
@@ -11,15 +8,24 @@
 #include <cmath>
 
 #include <hal/FRCUsageReporting.h>
-#include <wpi/math>
+#include <wpi/numbers>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/MathUtil.h"
 #include "frc/SpeedController.h"
 #include "frc/drive/Vector2d.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
+#if defined(_MSC_VER)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 MecanumDrive::MecanumDrive(SpeedController& frontLeftMotor,
                            SpeedController& rearLeftMotor,
                            SpeedController& frontRightMotor,
@@ -28,14 +34,13 @@
       m_rearLeftMotor(&rearLeftMotor),
       m_frontRightMotor(&frontRightMotor),
       m_rearRightMotor(&rearRightMotor) {
-  auto& registry = SendableRegistry::GetInstance();
-  registry.AddChild(this, m_frontLeftMotor);
-  registry.AddChild(this, m_rearLeftMotor);
-  registry.AddChild(this, m_frontRightMotor);
-  registry.AddChild(this, m_rearRightMotor);
+  wpi::SendableRegistry::AddChild(this, m_frontLeftMotor);
+  wpi::SendableRegistry::AddChild(this, m_rearLeftMotor);
+  wpi::SendableRegistry::AddChild(this, m_frontRightMotor);
+  wpi::SendableRegistry::AddChild(this, m_rearRightMotor);
   static int instances = 0;
   ++instances;
-  registry.AddLW(this, "MecanumDrive", instances);
+  wpi::SendableRegistry::AddLW(this, "MecanumDrive", instances);
 }
 
 void MecanumDrive::DriveCartesian(double ySpeed, double xSpeed,
@@ -46,30 +51,16 @@
     reported = true;
   }
 
-  ySpeed = std::clamp(ySpeed, -1.0, 1.0);
   ySpeed = ApplyDeadband(ySpeed, m_deadband);
-
-  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
   xSpeed = ApplyDeadband(xSpeed, m_deadband);
 
-  // Compensate for gyro angle.
-  Vector2d input{ySpeed, xSpeed};
-  input.Rotate(-gyroAngle);
+  auto [frontLeft, frontRight, rearLeft, rearRight] =
+      DriveCartesianIK(ySpeed, xSpeed, zRotation, gyroAngle);
 
-  double wheelSpeeds[4];
-  wheelSpeeds[kFrontLeft] = input.x + input.y + zRotation;
-  wheelSpeeds[kFrontRight] = -input.x + input.y - zRotation;
-  wheelSpeeds[kRearLeft] = -input.x + input.y + zRotation;
-  wheelSpeeds[kRearRight] = input.x + input.y - zRotation;
-
-  Normalize(wheelSpeeds);
-
-  m_frontLeftMotor->Set(wheelSpeeds[kFrontLeft] * m_maxOutput);
-  m_frontRightMotor->Set(wheelSpeeds[kFrontRight] * m_maxOutput *
-                         m_rightSideInvertMultiplier);
-  m_rearLeftMotor->Set(wheelSpeeds[kRearLeft] * m_maxOutput);
-  m_rearRightMotor->Set(wheelSpeeds[kRearRight] * m_maxOutput *
-                        m_rightSideInvertMultiplier);
+  m_frontLeftMotor->Set(frontLeft * m_maxOutput);
+  m_frontRightMotor->Set(frontRight * m_maxOutput);
+  m_rearLeftMotor->Set(rearLeft * m_maxOutput);
+  m_rearRightMotor->Set(rearRight * m_maxOutput);
 
   Feed();
 }
@@ -82,19 +73,11 @@
     reported = true;
   }
 
-  DriveCartesian(magnitude * std::sin(angle * (wpi::math::pi / 180.0)),
-                 magnitude * std::cos(angle * (wpi::math::pi / 180.0)),
+  DriveCartesian(magnitude * std::cos(angle * (wpi::numbers::pi / 180.0)),
+                 magnitude * std::sin(angle * (wpi::numbers::pi / 180.0)),
                  zRotation, 0.0);
 }
 
-bool MecanumDrive::IsRightSideInverted() const {
-  return m_rightSideInvertMultiplier == -1.0;
-}
-
-void MecanumDrive::SetRightSideInverted(bool rightSideInverted) {
-  m_rightSideInvertMultiplier = rightSideInverted ? -1.0 : 1.0;
-}
-
 void MecanumDrive::StopMotor() {
   m_frontLeftMotor->StopMotor();
   m_frontRightMotor->StopMotor();
@@ -103,30 +86,47 @@
   Feed();
 }
 
-void MecanumDrive::GetDescription(wpi::raw_ostream& desc) const {
-  desc << "MecanumDrive";
+MecanumDrive::WheelSpeeds MecanumDrive::DriveCartesianIK(double ySpeed,
+                                                         double xSpeed,
+                                                         double zRotation,
+                                                         double gyroAngle) {
+  ySpeed = std::clamp(ySpeed, -1.0, 1.0);
+  xSpeed = std::clamp(xSpeed, -1.0, 1.0);
+
+  // Compensate for gyro angle.
+  Vector2d input{ySpeed, xSpeed};
+  input.Rotate(-gyroAngle);
+
+  double wheelSpeeds[4];
+  wheelSpeeds[kFrontLeft] = input.x + input.y + zRotation;
+  wheelSpeeds[kFrontRight] = input.x - input.y - zRotation;
+  wheelSpeeds[kRearLeft] = input.x - input.y + zRotation;
+  wheelSpeeds[kRearRight] = input.x + input.y - zRotation;
+
+  Normalize(wheelSpeeds);
+
+  return {wheelSpeeds[kFrontLeft], wheelSpeeds[kFrontRight],
+          wheelSpeeds[kRearLeft], wheelSpeeds[kRearRight]};
 }
 
-void MecanumDrive::InitSendable(SendableBuilder& builder) {
+std::string MecanumDrive::GetDescription() const {
+  return "MecanumDrive";
+}
+
+void MecanumDrive::InitSendable(wpi::SendableBuilder& builder) {
   builder.SetSmartDashboardType("MecanumDrive");
   builder.SetActuator(true);
   builder.SetSafeState([=] { StopMotor(); });
   builder.AddDoubleProperty(
-      "Front Left Motor Speed", [=]() { return m_frontLeftMotor->Get(); },
+      "Front Left Motor Speed", [=] { return m_frontLeftMotor->Get(); },
       [=](double value) { m_frontLeftMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Front Right Motor Speed",
-      [=]() { return m_frontRightMotor->Get() * m_rightSideInvertMultiplier; },
-      [=](double value) {
-        m_frontRightMotor->Set(value * m_rightSideInvertMultiplier);
-      });
+      "Front Right Motor Speed", [=] { return m_frontRightMotor->Get(); },
+      [=](double value) { m_frontRightMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Rear Left Motor Speed", [=]() { return m_rearLeftMotor->Get(); },
+      "Rear Left Motor Speed", [=] { return m_rearLeftMotor->Get(); },
       [=](double value) { m_rearLeftMotor->Set(value); });
   builder.AddDoubleProperty(
-      "Rear Right Motor Speed",
-      [=]() { return m_rearRightMotor->Get() * m_rightSideInvertMultiplier; },
-      [=](double value) {
-        m_rearRightMotor->Set(value * m_rightSideInvertMultiplier);
-      });
+      "Rear Right Motor Speed", [=] { return m_rearRightMotor->Get(); },
+      [=](double value) { m_rearRightMotor->Set(value); });
 }
diff --git a/wpilibc/src/main/native/cpp/drive/RobotDriveBase.cpp b/wpilibc/src/main/native/cpp/drive/RobotDriveBase.cpp
index fbce5a1..2159958 100644
--- a/wpilibc/src/main/native/cpp/drive/RobotDriveBase.cpp
+++ b/wpilibc/src/main/native/cpp/drive/RobotDriveBase.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/drive/RobotDriveBase.h"
 
@@ -13,32 +10,32 @@
 
 #include <hal/FRCUsageReporting.h>
 
-#include "frc/Base.h"
-#include "frc/SpeedController.h"
+#include "frc/MathUtil.h"
+#include "frc/motorcontrol/MotorController.h"
 
 using namespace frc;
 
-RobotDriveBase::RobotDriveBase() { SetSafetyEnabled(true); }
-
-void RobotDriveBase::SetDeadband(double deadband) { m_deadband = deadband; }
-
-void RobotDriveBase::SetMaxOutput(double maxOutput) { m_maxOutput = maxOutput; }
-
-void RobotDriveBase::FeedWatchdog() { Feed(); }
-
-double RobotDriveBase::ApplyDeadband(double value, double deadband) {
-  if (std::abs(value) > deadband) {
-    if (value > 0.0) {
-      return (value - deadband) / (1.0 - deadband);
-    } else {
-      return (value + deadband) / (1.0 - deadband);
-    }
-  } else {
-    return 0.0;
-  }
+RobotDriveBase::RobotDriveBase() {
+  SetSafetyEnabled(true);
 }
 
-void RobotDriveBase::Normalize(wpi::MutableArrayRef<double> wheelSpeeds) {
+void RobotDriveBase::SetDeadband(double deadband) {
+  m_deadband = deadband;
+}
+
+void RobotDriveBase::SetMaxOutput(double maxOutput) {
+  m_maxOutput = maxOutput;
+}
+
+void RobotDriveBase::FeedWatchdog() {
+  Feed();
+}
+
+double RobotDriveBase::ApplyDeadband(double value, double deadband) {
+  return frc::ApplyDeadband(value, deadband);
+}
+
+void RobotDriveBase::Normalize(wpi::span<double> wheelSpeeds) {
   double maxMagnitude = std::abs(wheelSpeeds[0]);
   for (size_t i = 1; i < wheelSpeeds.size(); i++) {
     double temp = std::abs(wheelSpeeds[i]);
diff --git a/wpilibc/src/main/native/cpp/drive/Vector2d.cpp b/wpilibc/src/main/native/cpp/drive/Vector2d.cpp
index a6e68a6..a342dc2 100644
--- a/wpilibc/src/main/native/cpp/drive/Vector2d.cpp
+++ b/wpilibc/src/main/native/cpp/drive/Vector2d.cpp
@@ -1,15 +1,12 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/drive/Vector2d.h"
 
 #include <cmath>
 
-#include <wpi/math>
+#include <wpi/numbers>
 
 using namespace frc;
 
@@ -19,8 +16,8 @@
 }
 
 void Vector2d::Rotate(double angle) {
-  double cosA = std::cos(angle * (wpi::math::pi / 180.0));
-  double sinA = std::sin(angle * (wpi::math::pi / 180.0));
+  double cosA = std::cos(angle * (wpi::numbers::pi / 180.0));
+  double sinA = std::sin(angle * (wpi::numbers::pi / 180.0));
   double out[2];
   out[0] = x * cosA - y * sinA;
   out[1] = x * sinA + y * cosA;
@@ -32,7 +29,9 @@
   return x * vec.x + y * vec.y;
 }
 
-double Vector2d::Magnitude() const { return std::sqrt(x * x + y * y); }
+double Vector2d::Magnitude() const {
+  return std::sqrt(x * x + y * y);
+}
 
 double Vector2d::ScalarProject(const Vector2d& vec) const {
   return Dot(vec) / vec.Magnitude();
diff --git a/wpilibc/src/main/native/cpp/filters/Filter.cpp b/wpilibc/src/main/native/cpp/filters/Filter.cpp
deleted file mode 100644
index c25d7af..0000000
--- a/wpilibc/src/main/native/cpp/filters/Filter.cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/filters/Filter.h"
-
-#include "frc/Base.h"
-
-using namespace frc;
-
-Filter::Filter(PIDSource& source)
-    : m_source(std::shared_ptr<PIDSource>(&source, NullDeleter<PIDSource>())) {}
-
-Filter::Filter(std::shared_ptr<PIDSource> source)
-    : m_source(std::move(source)) {}
-
-void Filter::SetPIDSourceType(PIDSourceType pidSource) {
-  m_source->SetPIDSourceType(pidSource);
-}
-
-PIDSourceType Filter::GetPIDSourceType() const {
-  return m_source->GetPIDSourceType();
-}
-
-double Filter::PIDGetSource() { return m_source->PIDGet(); }
diff --git a/wpilibc/src/main/native/cpp/filters/LinearDigitalFilter.cpp b/wpilibc/src/main/native/cpp/filters/LinearDigitalFilter.cpp
deleted file mode 100644
index 434cc27..0000000
--- a/wpilibc/src/main/native/cpp/filters/LinearDigitalFilter.cpp
+++ /dev/null
@@ -1,136 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/filters/LinearDigitalFilter.h"
-
-#include <cassert>
-#include <cmath>
-
-#include <hal/FRCUsageReporting.h>
-
-using namespace frc;
-
-LinearDigitalFilter::LinearDigitalFilter(PIDSource& source,
-                                         wpi::ArrayRef<double> ffGains,
-                                         wpi::ArrayRef<double> fbGains)
-    : Filter(source),
-      m_inputs(ffGains.size()),
-      m_outputs(fbGains.size()),
-      m_inputGains(ffGains),
-      m_outputGains(fbGains) {
-  static int instances = 0;
-  instances++;
-  HAL_Report(HALUsageReporting::kResourceType_LinearFilter, instances);
-}
-
-LinearDigitalFilter::LinearDigitalFilter(PIDSource& source,
-                                         std::initializer_list<double> ffGains,
-                                         std::initializer_list<double> fbGains)
-    : LinearDigitalFilter(source,
-                          wpi::makeArrayRef(ffGains.begin(), ffGains.end()),
-                          wpi::makeArrayRef(fbGains.begin(), fbGains.end())) {}
-
-LinearDigitalFilter::LinearDigitalFilter(std::shared_ptr<PIDSource> source,
-                                         wpi::ArrayRef<double> ffGains,
-                                         wpi::ArrayRef<double> fbGains)
-    : Filter(source),
-      m_inputs(ffGains.size()),
-      m_outputs(fbGains.size()),
-      m_inputGains(ffGains),
-      m_outputGains(fbGains) {
-  static int instances = 0;
-  instances++;
-  HAL_Report(HALUsageReporting::kResourceType_LinearFilter, instances);
-}
-
-LinearDigitalFilter::LinearDigitalFilter(std::shared_ptr<PIDSource> source,
-                                         std::initializer_list<double> ffGains,
-                                         std::initializer_list<double> fbGains)
-    : LinearDigitalFilter(source,
-                          wpi::makeArrayRef(ffGains.begin(), ffGains.end()),
-                          wpi::makeArrayRef(fbGains.begin(), fbGains.end())) {}
-
-LinearDigitalFilter LinearDigitalFilter::SinglePoleIIR(PIDSource& source,
-                                                       double timeConstant,
-                                                       double period) {
-  double gain = std::exp(-period / timeConstant);
-  return LinearDigitalFilter(source, {1.0 - gain}, {-gain});
-}
-
-LinearDigitalFilter LinearDigitalFilter::HighPass(PIDSource& source,
-                                                  double timeConstant,
-                                                  double period) {
-  double gain = std::exp(-period / timeConstant);
-  return LinearDigitalFilter(source, {gain, -gain}, {-gain});
-}
-
-LinearDigitalFilter LinearDigitalFilter::MovingAverage(PIDSource& source,
-                                                       int taps) {
-  assert(taps > 0);
-
-  std::vector<double> gains(taps, 1.0 / taps);
-  return LinearDigitalFilter(source, gains, {});
-}
-
-LinearDigitalFilter LinearDigitalFilter::SinglePoleIIR(
-    std::shared_ptr<PIDSource> source, double timeConstant, double period) {
-  double gain = std::exp(-period / timeConstant);
-  return LinearDigitalFilter(std::move(source), {1.0 - gain}, {-gain});
-}
-
-LinearDigitalFilter LinearDigitalFilter::HighPass(
-    std::shared_ptr<PIDSource> source, double timeConstant, double period) {
-  double gain = std::exp(-period / timeConstant);
-  return LinearDigitalFilter(std::move(source), {gain, -gain}, {-gain});
-}
-
-LinearDigitalFilter LinearDigitalFilter::MovingAverage(
-    std::shared_ptr<PIDSource> source, int taps) {
-  assert(taps > 0);
-
-  std::vector<double> gains(taps, 1.0 / taps);
-  return LinearDigitalFilter(std::move(source), gains, {});
-}
-
-double LinearDigitalFilter::Get() const {
-  double retVal = 0.0;
-
-  // Calculate the new value
-  for (size_t i = 0; i < m_inputGains.size(); i++) {
-    retVal += m_inputs[i] * m_inputGains[i];
-  }
-  for (size_t i = 0; i < m_outputGains.size(); i++) {
-    retVal -= m_outputs[i] * m_outputGains[i];
-  }
-
-  return retVal;
-}
-
-void LinearDigitalFilter::Reset() {
-  m_inputs.reset();
-  m_outputs.reset();
-}
-
-double LinearDigitalFilter::PIDGet() {
-  double retVal = 0.0;
-
-  // Rotate the inputs
-  m_inputs.push_front(PIDGetSource());
-
-  // Calculate the new value
-  for (size_t i = 0; i < m_inputGains.size(); i++) {
-    retVal += m_inputs[i] * m_inputGains[i];
-  }
-  for (size_t i = 0; i < m_outputGains.size(); i++) {
-    retVal -= m_outputs[i] * m_outputGains[i];
-  }
-
-  // Rotate the outputs
-  m_outputs.push_front(retVal);
-
-  return retVal;
-}
diff --git a/wpilibc/src/main/native/cpp/frc2/Timer.cpp b/wpilibc/src/main/native/cpp/frc2/Timer.cpp
deleted file mode 100644
index 36da4c6..0000000
--- a/wpilibc/src/main/native/cpp/frc2/Timer.cpp
+++ /dev/null
@@ -1,132 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc2/Timer.h"
-
-#include <chrono>
-#include <thread>
-
-#include "frc/DriverStation.h"
-#include "frc/RobotController.h"
-
-namespace frc2 {
-
-void Wait(units::second_t seconds) {
-  std::this_thread::sleep_for(
-      std::chrono::duration<double>(seconds.to<double>()));
-}
-
-units::second_t GetTime() {
-  using std::chrono::duration;
-  using std::chrono::duration_cast;
-  using std::chrono::system_clock;
-
-  return units::second_t(
-      duration_cast<duration<double>>(system_clock::now().time_since_epoch())
-          .count());
-}
-
-}  // namespace frc2
-
-using namespace frc2;
-
-Timer::Timer() { Reset(); }
-
-Timer::Timer(const Timer& rhs)
-    : m_startTime(rhs.m_startTime),
-      m_accumulatedTime(rhs.m_accumulatedTime),
-      m_running(rhs.m_running) {}
-
-Timer& Timer::operator=(const Timer& rhs) {
-  std::scoped_lock lock(m_mutex, rhs.m_mutex);
-
-  m_startTime = rhs.m_startTime;
-  m_accumulatedTime = rhs.m_accumulatedTime;
-  m_running = rhs.m_running;
-
-  return *this;
-}
-
-Timer::Timer(Timer&& rhs)
-    : m_startTime(std::move(rhs.m_startTime)),
-      m_accumulatedTime(std::move(rhs.m_accumulatedTime)),
-      m_running(std::move(rhs.m_running)) {}
-
-Timer& Timer::operator=(Timer&& rhs) {
-  std::scoped_lock lock(m_mutex, rhs.m_mutex);
-
-  m_startTime = std::move(rhs.m_startTime);
-  m_accumulatedTime = std::move(rhs.m_accumulatedTime);
-  m_running = std::move(rhs.m_running);
-
-  return *this;
-}
-
-units::second_t Timer::Get() const {
-  units::second_t result;
-  units::second_t currentTime = GetFPGATimestamp();
-
-  std::scoped_lock lock(m_mutex);
-  if (m_running) {
-    result = (currentTime - m_startTime) + m_accumulatedTime;
-  } else {
-    result = m_accumulatedTime;
-  }
-
-  return result;
-}
-
-void Timer::Reset() {
-  std::scoped_lock lock(m_mutex);
-  m_accumulatedTime = 0_s;
-  m_startTime = GetFPGATimestamp();
-}
-
-void Timer::Start() {
-  std::scoped_lock lock(m_mutex);
-  if (!m_running) {
-    m_startTime = GetFPGATimestamp();
-    m_running = true;
-  }
-}
-
-void Timer::Stop() {
-  units::second_t temp = Get();
-
-  std::scoped_lock lock(m_mutex);
-  if (m_running) {
-    m_accumulatedTime = temp;
-    m_running = false;
-  }
-}
-
-bool Timer::HasElapsed(units::second_t period) const { return Get() > period; }
-
-bool Timer::HasPeriodPassed(units::second_t period) {
-  return AdvanceIfElapsed(period);
-}
-
-bool Timer::AdvanceIfElapsed(units::second_t period) {
-  if (Get() > period) {
-    std::scoped_lock lock(m_mutex);
-    // Advance the start time by the period.
-    m_startTime += period;
-    // Don't set it to the current time... we want to avoid drift.
-    return true;
-  } else {
-    return false;
-  }
-}
-
-units::second_t Timer::GetFPGATimestamp() {
-  // FPGA returns the timestamp in microseconds
-  return units::second_t(frc::RobotController::GetFPGATime() * 1.0e-6);
-}
-
-units::second_t Timer::GetMatchTime() {
-  return units::second_t(frc::DriverStation::GetInstance().GetMatchTime());
-}
diff --git a/wpilibc/src/main/native/cpp/interfaces/Potentiometer.cpp b/wpilibc/src/main/native/cpp/interfaces/Potentiometer.cpp
deleted file mode 100644
index 44f4aab..0000000
--- a/wpilibc/src/main/native/cpp/interfaces/Potentiometer.cpp
+++ /dev/null
@@ -1,18 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/interfaces/Potentiometer.h"
-
-#include "frc/Utility.h"
-
-using namespace frc;
-
-void Potentiometer::SetPIDSourceType(PIDSourceType pidSource) {
-  if (wpi_assert(pidSource == PIDSourceType::kDisplacement)) {
-    m_pidSource = pidSource;
-  }
-}
diff --git a/wpilibc/src/main/native/cpp/livewindow/LiveWindow.cpp b/wpilibc/src/main/native/cpp/livewindow/LiveWindow.cpp
index 517ecf7..f8be7de 100644
--- a/wpilibc/src/main/native/cpp/livewindow/LiveWindow.cpp
+++ b/wpilibc/src/main/native/cpp/livewindow/LiveWindow.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2012-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/livewindow/LiveWindow.h"
 
@@ -11,153 +8,191 @@
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableInstance.h>
 #include <wpi/mutex.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/smartdashboard/Sendable.h"
 #include "frc/smartdashboard/SendableBuilderImpl.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
-using wpi::Twine;
+namespace {
+struct Component {
+  bool firstTime = true;
+  bool telemetryEnabled = true;
+};
 
-struct LiveWindow::Impl {
-  Impl();
-
-  struct Component {
-    bool firstTime = true;
-    bool telemetryEnabled = true;
-  };
+struct Instance {
+  Instance() {
+    wpi::SendableRegistry::SetLiveWindowBuilderFactory(
+        [] { return std::make_unique<SendableBuilderImpl>(); });
+  }
 
   wpi::mutex mutex;
 
-  SendableRegistry& registry;
-  int dataHandle;
+  int dataHandle = wpi::SendableRegistry::GetDataHandle();
 
-  std::shared_ptr<nt::NetworkTable> liveWindowTable;
-  std::shared_ptr<nt::NetworkTable> statusTable;
-  nt::NetworkTableEntry enabledEntry;
+  std::shared_ptr<nt::NetworkTable> liveWindowTable =
+      nt::NetworkTableInstance::GetDefault().GetTable("LiveWindow");
+  std::shared_ptr<nt::NetworkTable> statusTable =
+      liveWindowTable->GetSubTable(".status");
+  nt::NetworkTableEntry enabledEntry = statusTable->GetEntry("LW Enabled");
 
   bool startLiveWindow = false;
   bool liveWindowEnabled = false;
   bool telemetryEnabled = true;
 
-  std::shared_ptr<Component> GetOrAdd(Sendable* sendable);
-};
+  std::function<void()> enabled;
+  std::function<void()> disabled;
 
-LiveWindow::Impl::Impl()
-    : registry(SendableRegistry::GetInstance()),
-      dataHandle(registry.GetDataHandle()),
-      liveWindowTable(
-          nt::NetworkTableInstance::GetDefault().GetTable("LiveWindow")) {
-  statusTable = liveWindowTable->GetSubTable(".status");
-  enabledEntry = statusTable->GetEntry("LW Enabled");
+  std::shared_ptr<Component> GetOrAdd(wpi::Sendable* sendable);
+};
+}  // namespace
+
+static Instance& GetInstance() {
+  static Instance instance;
+  return instance;
 }
 
-std::shared_ptr<LiveWindow::Impl::Component> LiveWindow::Impl::GetOrAdd(
-    Sendable* sendable) {
+std::shared_ptr<Component> Instance::GetOrAdd(wpi::Sendable* sendable) {
   auto data = std::static_pointer_cast<Component>(
-      registry.GetData(sendable, dataHandle));
+      wpi::SendableRegistry::GetData(sendable, dataHandle));
   if (!data) {
     data = std::make_shared<Component>();
-    registry.SetData(sendable, dataHandle, data);
+    wpi::SendableRegistry::SetData(sendable, dataHandle, data);
   }
   return data;
 }
 
 LiveWindow* LiveWindow::GetInstance() {
+  ::GetInstance();
   static LiveWindow instance;
   return &instance;
 }
 
-void LiveWindow::EnableTelemetry(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  // Re-enable global setting in case DisableAllTelemetry() was called.
-  m_impl->telemetryEnabled = true;
-  m_impl->GetOrAdd(sendable)->telemetryEnabled = true;
+void LiveWindow::SetEnabledCallback(std::function<void()> func) {
+  ::GetInstance().enabled = func;
 }
 
-void LiveWindow::DisableTelemetry(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  m_impl->GetOrAdd(sendable)->telemetryEnabled = false;
+void LiveWindow::SetDisabledCallback(std::function<void()> func) {
+  ::GetInstance().disabled = func;
+}
+
+void LiveWindow::EnableTelemetry(wpi::Sendable* sendable) {
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
+  // Re-enable global setting in case DisableAllTelemetry() was called.
+  inst.telemetryEnabled = true;
+  inst.GetOrAdd(sendable)->telemetryEnabled = true;
+}
+
+void LiveWindow::DisableTelemetry(wpi::Sendable* sendable) {
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
+  inst.GetOrAdd(sendable)->telemetryEnabled = false;
 }
 
 void LiveWindow::DisableAllTelemetry() {
-  std::scoped_lock lock(m_impl->mutex);
-  m_impl->telemetryEnabled = false;
-  m_impl->registry.ForeachLiveWindow(m_impl->dataHandle, [&](auto& cbdata) {
-    if (!cbdata.data) cbdata.data = std::make_shared<Impl::Component>();
-    std::static_pointer_cast<Impl::Component>(cbdata.data)->telemetryEnabled =
-        false;
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
+  inst.telemetryEnabled = false;
+  wpi::SendableRegistry::ForeachLiveWindow(inst.dataHandle, [&](auto& cbdata) {
+    if (!cbdata.data) {
+      cbdata.data = std::make_shared<Component>();
+    }
+    std::static_pointer_cast<Component>(cbdata.data)->telemetryEnabled = false;
   });
 }
 
-bool LiveWindow::IsEnabled() const {
-  std::scoped_lock lock(m_impl->mutex);
-  return m_impl->liveWindowEnabled;
+bool LiveWindow::IsEnabled() {
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
+  return inst.liveWindowEnabled;
 }
 
 void LiveWindow::SetEnabled(bool enabled) {
-  std::scoped_lock lock(m_impl->mutex);
-  if (m_impl->liveWindowEnabled == enabled) return;
-  m_impl->startLiveWindow = enabled;
-  m_impl->liveWindowEnabled = enabled;
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
+  if (inst.liveWindowEnabled == enabled) {
+    return;
+  }
+  inst.startLiveWindow = enabled;
+  inst.liveWindowEnabled = enabled;
   // Force table generation now to make sure everything is defined
   UpdateValuesUnsafe();
   if (enabled) {
-    if (this->enabled) this->enabled();
+    if (inst.enabled) {
+      inst.enabled();
+    }
   } else {
-    m_impl->registry.ForeachLiveWindow(m_impl->dataHandle, [&](auto& cbdata) {
-      cbdata.builder.StopLiveWindowMode();
-    });
-    if (this->disabled) this->disabled();
+    wpi::SendableRegistry::ForeachLiveWindow(
+        inst.dataHandle, [&](auto& cbdata) {
+          static_cast<SendableBuilderImpl&>(cbdata.builder)
+              .StopLiveWindowMode();
+        });
+    if (inst.disabled) {
+      inst.disabled();
+    }
   }
-  m_impl->enabledEntry.SetBoolean(enabled);
+  inst.enabledEntry.SetBoolean(enabled);
 }
 
 void LiveWindow::UpdateValues() {
-  std::scoped_lock lock(m_impl->mutex);
+  auto& inst = ::GetInstance();
+  std::scoped_lock lock(inst.mutex);
   UpdateValuesUnsafe();
 }
 
 void LiveWindow::UpdateValuesUnsafe() {
+  auto& inst = ::GetInstance();
   // Only do this if either LiveWindow mode or telemetry is enabled.
-  if (!m_impl->liveWindowEnabled && !m_impl->telemetryEnabled) return;
+  if (!inst.liveWindowEnabled && !inst.telemetryEnabled) {
+    return;
+  }
 
-  m_impl->registry.ForeachLiveWindow(m_impl->dataHandle, [&](auto& cbdata) {
-    if (!cbdata.sendable || cbdata.parent) return;
+  wpi::SendableRegistry::ForeachLiveWindow(inst.dataHandle, [&](auto& cbdata) {
+    if (!cbdata.sendable || cbdata.parent) {
+      return;
+    }
 
-    if (!cbdata.data) cbdata.data = std::make_shared<Impl::Component>();
+    if (!cbdata.data) {
+      cbdata.data = std::make_shared<Component>();
+    }
 
-    auto& comp = *std::static_pointer_cast<Impl::Component>(cbdata.data);
+    auto& comp = *std::static_pointer_cast<Component>(cbdata.data);
 
-    if (!m_impl->liveWindowEnabled && !comp.telemetryEnabled) return;
+    if (!inst.liveWindowEnabled && !comp.telemetryEnabled) {
+      return;
+    }
 
     if (comp.firstTime) {
       // By holding off creating the NetworkTable entries, it allows the
       // components to be redefined. This allows default sensor and actuator
       // values to be created that are replaced with the custom names from
       // users calling setName.
-      if (cbdata.name.empty()) return;
-      auto ssTable = m_impl->liveWindowTable->GetSubTable(cbdata.subsystem);
-      std::shared_ptr<NetworkTable> table;
+      if (cbdata.name.empty()) {
+        return;
+      }
+      auto ssTable = inst.liveWindowTable->GetSubTable(cbdata.subsystem);
+      std::shared_ptr<nt::NetworkTable> table;
       // Treat name==subsystem as top level of subsystem
-      if (cbdata.name == cbdata.subsystem)
+      if (cbdata.name == cbdata.subsystem) {
         table = ssTable;
-      else
+      } else {
         table = ssTable->GetSubTable(cbdata.name);
+      }
       table->GetEntry(".name").SetString(cbdata.name);
-      cbdata.builder.SetTable(table);
+      static_cast<SendableBuilderImpl&>(cbdata.builder).SetTable(table);
       cbdata.sendable->InitSendable(cbdata.builder);
       ssTable->GetEntry(".type").SetString("LW Subsystem");
 
       comp.firstTime = false;
     }
 
-    if (m_impl->startLiveWindow) cbdata.builder.StartLiveWindowMode();
-    cbdata.builder.UpdateTable();
+    if (inst.startLiveWindow) {
+      static_cast<SendableBuilderImpl&>(cbdata.builder).StartLiveWindowMode();
+    }
+    cbdata.builder.Update();
   });
 
-  m_impl->startLiveWindow = false;
+  inst.startLiveWindow = false;
 }
-
-LiveWindow::LiveWindow() : m_impl(new Impl) {}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/DMC60.cpp b/wpilibc/src/main/native/cpp/motorcontrol/DMC60.cpp
new file mode 100644
index 0000000..81fa868
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/DMC60.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/DMC60.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+DMC60::DMC60(int channel) : PWMMotorController("DMC60", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_DigilentDMC60, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/Jaguar.cpp b/wpilibc/src/main/native/cpp/motorcontrol/Jaguar.cpp
new file mode 100644
index 0000000..c68ae0c
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/Jaguar.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/Jaguar.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+Jaguar::Jaguar(int channel) : PWMMotorController("Jaguar", channel) {
+  m_pwm.SetBounds(2.31, 1.55, 1.507, 1.454, 0.697);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_Jaguar, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/MotorControllerGroup.cpp b/wpilibc/src/main/native/cpp/motorcontrol/MotorControllerGroup.cpp
new file mode 100644
index 0000000..b7f26d1
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/MotorControllerGroup.cpp
@@ -0,0 +1,69 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/MotorControllerGroup.h"
+
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
+using namespace frc;
+
+// Can't use a delegated constructor here because of an MSVC bug.
+// https://developercommunity.visualstudio.com/content/problem/583/compiler-bug-with-delegating-a-constructor.html
+
+MotorControllerGroup::MotorControllerGroup(
+    std::vector<std::reference_wrapper<MotorController>>&& motorControllers)
+    : m_motorControllers(std::move(motorControllers)) {
+  Initialize();
+}
+
+void MotorControllerGroup::Initialize() {
+  for (auto& motorController : m_motorControllers) {
+    wpi::SendableRegistry::AddChild(this, &motorController.get());
+  }
+  static int instances = 0;
+  ++instances;
+  wpi::SendableRegistry::Add(this, "MotorControllerGroup", instances);
+}
+
+void MotorControllerGroup::Set(double speed) {
+  for (auto motorController : m_motorControllers) {
+    motorController.get().Set(m_isInverted ? -speed : speed);
+  }
+}
+
+double MotorControllerGroup::Get() const {
+  if (!m_motorControllers.empty()) {
+    return m_motorControllers.front().get().Get() * (m_isInverted ? -1 : 1);
+  }
+  return 0.0;
+}
+
+void MotorControllerGroup::SetInverted(bool isInverted) {
+  m_isInverted = isInverted;
+}
+
+bool MotorControllerGroup::GetInverted() const {
+  return m_isInverted;
+}
+
+void MotorControllerGroup::Disable() {
+  for (auto motorController : m_motorControllers) {
+    motorController.get().Disable();
+  }
+}
+
+void MotorControllerGroup::StopMotor() {
+  for (auto motorController : m_motorControllers) {
+    motorController.get().StopMotor();
+  }
+}
+
+void MotorControllerGroup::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Motor Controller");
+  builder.SetActuator(true);
+  builder.SetSafeState([=] { StopMotor(); });
+  builder.AddDoubleProperty(
+      "Value", [=] { return Get(); }, [=](double value) { Set(value); });
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/NidecBrushless.cpp b/wpilibc/src/main/native/cpp/motorcontrol/NidecBrushless.cpp
new file mode 100644
index 0000000..21164eb
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/NidecBrushless.cpp
@@ -0,0 +1,79 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/NidecBrushless.h"
+
+#include <fmt/format.h>
+#include <hal/FRCUsageReporting.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
+using namespace frc;
+
+NidecBrushless::NidecBrushless(int pwmChannel, int dioChannel)
+    : m_dio(dioChannel), m_pwm(pwmChannel) {
+  wpi::SendableRegistry::AddChild(this, &m_dio);
+  wpi::SendableRegistry::AddChild(this, &m_pwm);
+  SetExpiration(0_s);
+  SetSafetyEnabled(false);
+
+  // the dio controls the output (in PWM mode)
+  m_dio.SetPWMRate(15625);
+  m_dio.EnablePWM(0.5);
+
+  HAL_Report(HALUsageReporting::kResourceType_NidecBrushless, pwmChannel + 1);
+  wpi::SendableRegistry::AddLW(this, "Nidec Brushless", pwmChannel);
+}
+
+void NidecBrushless::Set(double speed) {
+  if (!m_disabled) {
+    m_speed = speed;
+    m_dio.UpdateDutyCycle(0.5 + 0.5 * (m_isInverted ? -speed : speed));
+    m_pwm.SetRaw(0xffff);
+  }
+  Feed();
+}
+
+double NidecBrushless::Get() const {
+  return m_speed;
+}
+
+void NidecBrushless::SetInverted(bool isInverted) {
+  m_isInverted = isInverted;
+}
+
+bool NidecBrushless::GetInverted() const {
+  return m_isInverted;
+}
+
+void NidecBrushless::Disable() {
+  m_disabled = true;
+  m_dio.UpdateDutyCycle(0.5);
+  m_pwm.SetDisabled();
+}
+
+void NidecBrushless::Enable() {
+  m_disabled = false;
+}
+
+void NidecBrushless::StopMotor() {
+  m_dio.UpdateDutyCycle(0.5);
+  m_pwm.SetDisabled();
+}
+
+std::string NidecBrushless::GetDescription() const {
+  return fmt::format("Nidec {}", GetChannel());
+}
+
+int NidecBrushless::GetChannel() const {
+  return m_pwm.GetChannel();
+}
+
+void NidecBrushless::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Nidec Brushless");
+  builder.SetActuator(true);
+  builder.SetSafeState([=] { StopMotor(); });
+  builder.AddDoubleProperty(
+      "Value", [=] { return Get(); }, [=](double value) { Set(value); });
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMMotorController.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMMotorController.cpp
new file mode 100644
index 0000000..9829a75
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMMotorController.cpp
@@ -0,0 +1,56 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+#include <fmt/format.h>
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
+using namespace frc;
+
+void PWMMotorController::Set(double speed) {
+  m_pwm.SetSpeed(m_isInverted ? -speed : speed);
+}
+
+double PWMMotorController::Get() const {
+  return m_pwm.GetSpeed() * (m_isInverted ? -1.0 : 1.0);
+}
+
+void PWMMotorController::SetInverted(bool isInverted) {
+  m_isInverted = isInverted;
+}
+
+bool PWMMotorController::GetInverted() const {
+  return m_isInverted;
+}
+
+void PWMMotorController::Disable() {
+  m_pwm.SetDisabled();
+}
+
+void PWMMotorController::StopMotor() {
+  Disable();
+}
+
+std::string PWMMotorController::GetDescription() const {
+  return fmt::format("PWM {}", GetChannel());
+}
+
+int PWMMotorController::GetChannel() const {
+  return m_pwm.GetChannel();
+}
+
+PWMMotorController::PWMMotorController(std::string_view name, int channel)
+    : m_pwm(channel, false) {
+  wpi::SendableRegistry::AddLW(this, name, channel);
+}
+
+void PWMMotorController::InitSendable(wpi::SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Motor Controller");
+  builder.SetActuator(true);
+  builder.SetSafeState([=] { Disable(); });
+  builder.AddDoubleProperty(
+      "Value", [=] { return Get(); }, [=](double value) { Set(value); });
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMSparkMax.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMSparkMax.cpp
new file mode 100644
index 0000000..608d452
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMSparkMax.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMSparkMax.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PWMSparkMax::PWMSparkMax(int channel)
+    : PWMMotorController("PWMSparkMax", channel) {
+  m_pwm.SetBounds(2.003, 1.55, 1.50, 1.46, 0.999);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_RevSparkMaxPWM, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonFX.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonFX.cpp
new file mode 100644
index 0000000..2c6982b
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonFX.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMTalonFX.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PWMTalonFX::PWMTalonFX(int channel)
+    : PWMMotorController("PWMTalonFX", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_TalonFX, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonSRX.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonSRX.cpp
new file mode 100644
index 0000000..b253412
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMTalonSRX.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMTalonSRX.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PWMTalonSRX::PWMTalonSRX(int channel)
+    : PWMMotorController("PWMTalonSRX", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_PWMTalonSRX, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMVenom.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMVenom.cpp
new file mode 100644
index 0000000..e558028
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMVenom.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMVenom.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PWMVenom::PWMVenom(int channel) : PWMMotorController("PWMVenom", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_FusionVenom, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/PWMVictorSPX.cpp b/wpilibc/src/main/native/cpp/motorcontrol/PWMVictorSPX.cpp
new file mode 100644
index 0000000..10ce992
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/PWMVictorSPX.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/PWMVictorSPX.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+PWMVictorSPX::PWMVictorSPX(int channel)
+    : PWMMotorController("PWMVictorSPX", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_PWMVictorSPX, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/SD540.cpp b/wpilibc/src/main/native/cpp/motorcontrol/SD540.cpp
new file mode 100644
index 0000000..3d5738f
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/SD540.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/SD540.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+SD540::SD540(int channel) : PWMMotorController("SD540", channel) {
+  m_pwm.SetBounds(2.05, 1.55, 1.50, 1.44, 0.94);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_MindsensorsSD540,
+             GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/Spark.cpp b/wpilibc/src/main/native/cpp/motorcontrol/Spark.cpp
new file mode 100644
index 0000000..45394df
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/Spark.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/Spark.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+Spark::Spark(int channel) : PWMMotorController("Spark", channel) {
+  m_pwm.SetBounds(2.003, 1.55, 1.50, 1.46, 0.999);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_RevSPARK, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/Talon.cpp b/wpilibc/src/main/native/cpp/motorcontrol/Talon.cpp
new file mode 100644
index 0000000..f4b3b69
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/Talon.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/Talon.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+Talon::Talon(int channel) : PWMMotorController("Talon", channel) {
+  m_pwm.SetBounds(2.037, 1.539, 1.513, 1.487, 0.989);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_Talon, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/Victor.cpp b/wpilibc/src/main/native/cpp/motorcontrol/Victor.cpp
new file mode 100644
index 0000000..3ad29f7
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/Victor.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/Victor.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+Victor::Victor(int channel) : PWMMotorController("Victor", channel) {
+  m_pwm.SetBounds(2.027, 1.525, 1.507, 1.49, 1.026);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_2X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_Victor, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/motorcontrol/VictorSP.cpp b/wpilibc/src/main/native/cpp/motorcontrol/VictorSP.cpp
new file mode 100644
index 0000000..6dc888e
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/motorcontrol/VictorSP.cpp
@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/motorcontrol/VictorSP.h"
+
+#include <hal/FRCUsageReporting.h>
+
+using namespace frc;
+
+VictorSP::VictorSP(int channel) : PWMMotorController("VictorSP", channel) {
+  m_pwm.SetBounds(2.004, 1.52, 1.50, 1.48, 0.997);
+  m_pwm.SetPeriodMultiplier(PWM::kPeriodMultiplier_1X);
+  m_pwm.SetSpeed(0.0);
+  m_pwm.SetZeroLatch();
+
+  HAL_Report(HALUsageReporting::kResourceType_VictorSP, GetChannel() + 1);
+}
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ComplexWidget.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ComplexWidget.cpp
index 19e17bb..eaac173 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ComplexWidget.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ComplexWidget.cpp
@@ -1,42 +1,44 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ComplexWidget.h"
 
-#include "frc/smartdashboard/Sendable.h"
+#include <wpi/sendable/Sendable.h>
+
+#include "frc/smartdashboard/SendableBuilderImpl.h"
 
 using namespace frc;
 
 ComplexWidget::ComplexWidget(ShuffleboardContainer& parent,
-                             const wpi::Twine& title, Sendable& sendable)
+                             std::string_view title, wpi::Sendable& sendable)
     : ShuffleboardValue(title),
       ShuffleboardWidget(parent, title),
       m_sendable(sendable) {}
 
+ComplexWidget::~ComplexWidget() = default;
+
 void ComplexWidget::EnableIfActuator() {
-  if (m_builder.IsActuator()) {
-    m_builder.StartLiveWindowMode();
+  if (m_builder && static_cast<SendableBuilderImpl&>(*m_builder).IsActuator()) {
+    static_cast<SendableBuilderImpl&>(*m_builder).StartLiveWindowMode();
   }
 }
 
 void ComplexWidget::DisableIfActuator() {
-  if (m_builder.IsActuator()) {
-    m_builder.StopLiveWindowMode();
+  if (m_builder && static_cast<SendableBuilderImpl&>(*m_builder).IsActuator()) {
+    static_cast<SendableBuilderImpl&>(*m_builder).StopLiveWindowMode();
   }
 }
 
 void ComplexWidget::BuildInto(std::shared_ptr<nt::NetworkTable> parentTable,
                               std::shared_ptr<nt::NetworkTable> metaTable) {
   BuildMetadata(metaTable);
-  if (!m_builderInit) {
-    m_builder.SetTable(parentTable->GetSubTable(GetTitle()));
-    m_sendable.InitSendable(m_builder);
-    m_builder.StartListeners();
-    m_builderInit = true;
+  if (!m_builder) {
+    m_builder = std::make_unique<SendableBuilderImpl>();
+    static_cast<SendableBuilderImpl&>(*m_builder)
+        .SetTable(parentTable->GetSubTable(GetTitle()));
+    m_sendable.InitSendable(static_cast<SendableBuilderImpl&>(*m_builder));
+    static_cast<SendableBuilderImpl&>(*m_builder).StartListeners();
   }
-  m_builder.UpdateTable();
+  m_builder->Update();
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/LayoutType.cpp b/wpilibc/src/main/native/cpp/shuffleboard/LayoutType.cpp
index a21cad9..9c47efb 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/LayoutType.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/LayoutType.cpp
@@ -1,12 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/LayoutType.h"
 
 using namespace frc;
 
-wpi::StringRef LayoutType::GetLayoutName() const { return m_layoutName; }
+std::string_view LayoutType::GetLayoutName() const {
+  return m_layoutName;
+}
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/RecordingController.cpp b/wpilibc/src/main/native/cpp/shuffleboard/RecordingController.cpp
index d80001e..834c4be 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/RecordingController.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/RecordingController.cpp
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/RecordingController.h"
 
-#include "frc/DriverStation.h"
+#include "frc/Errors.h"
 
 using namespace frc;
 using namespace frc::detail;
@@ -29,7 +26,7 @@
   m_recordingControlEntry.SetBoolean(false);
 }
 
-void RecordingController::SetRecordingFileNameFormat(wpi::StringRef format) {
+void RecordingController::SetRecordingFileNameFormat(std::string_view format) {
   m_recordingFileNameFormatEntry.SetString(format);
 }
 
@@ -38,12 +35,14 @@
 }
 
 void RecordingController::AddEventMarker(
-    wpi::StringRef name, wpi::StringRef description,
+    std::string_view name, std::string_view description,
     ShuffleboardEventImportance importance) {
   if (name.empty()) {
-    DriverStation::ReportError("Shuffleboard event name was not specified");
+    FRC_ReportError(err::Error, "{}",
+                    "Shuffleboard event name was not specified");
     return;
   }
   m_eventsTable->GetSubTable(name)->GetEntry("Info").SetStringArray(
-      {description, ShuffleboardEventImportanceName(importance)});
+      {std::string{description},
+       std::string{ShuffleboardEventImportanceName(importance)}});
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/SendableCameraWrapper.cpp b/wpilibc/src/main/native/cpp/shuffleboard/SendableCameraWrapper.cpp
index 663cc19..1675c64 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/SendableCameraWrapper.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/SendableCameraWrapper.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/SendableCameraWrapper.h"
 
@@ -12,9 +9,8 @@
 #include <string>
 
 #include <wpi/DenseMap.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <wpi/sendable/SendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
 
 namespace frc {
 namespace detail {
@@ -24,12 +20,12 @@
   return wrappers[static_cast<int>(source)];
 }
 
-void AddToSendableRegistry(frc::Sendable* sendable, std::string name) {
-  SendableRegistry::GetInstance().Add(sendable, name);
+void AddToSendableRegistry(wpi::Sendable* sendable, std::string name) {
+  wpi::SendableRegistry::Add(sendable, name);
 }
 }  // namespace detail
 
-void SendableCameraWrapper::InitSendable(SendableBuilder& builder) {
+void SendableCameraWrapper::InitSendable(wpi::SendableBuilder& builder) {
   builder.AddStringProperty(
       ".ShuffleboardURI", [this] { return m_uri; }, nullptr);
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/Shuffleboard.cpp b/wpilibc/src/main/native/cpp/shuffleboard/Shuffleboard.cpp
index 2d69847..16b404c 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/Shuffleboard.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/Shuffleboard.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/Shuffleboard.h"
 
@@ -13,15 +10,19 @@
 
 using namespace frc;
 
-void Shuffleboard::Update() { GetInstance().Update(); }
+void Shuffleboard::Update() {
+  GetInstance().Update();
+}
 
-ShuffleboardTab& Shuffleboard::GetTab(wpi::StringRef title) {
+ShuffleboardTab& Shuffleboard::GetTab(std::string_view title) {
   return GetInstance().GetTab(title);
 }
 
-void Shuffleboard::SelectTab(int index) { GetInstance().SelectTab(index); }
+void Shuffleboard::SelectTab(int index) {
+  GetInstance().SelectTab(index);
+}
 
-void Shuffleboard::SelectTab(wpi::StringRef title) {
+void Shuffleboard::SelectTab(std::string_view title) {
   GetInstance().SelectTab(title);
 }
 
@@ -39,9 +40,11 @@
   GetRecordingController().StartRecording();
 }
 
-void Shuffleboard::StopRecording() { GetRecordingController().StopRecording(); }
+void Shuffleboard::StopRecording() {
+  GetRecordingController().StopRecording();
+}
 
-void Shuffleboard::SetRecordingFileNameFormat(wpi::StringRef format) {
+void Shuffleboard::SetRecordingFileNameFormat(std::string_view format) {
   GetRecordingController().SetRecordingFileNameFormat(format);
 }
 
@@ -49,13 +52,13 @@
   GetRecordingController().ClearRecordingFileNameFormat();
 }
 
-void Shuffleboard::AddEventMarker(wpi::StringRef name,
-                                  wpi::StringRef description,
+void Shuffleboard::AddEventMarker(std::string_view name,
+                                  std::string_view description,
                                   ShuffleboardEventImportance importance) {
   GetRecordingController().AddEventMarker(name, description, importance);
 }
 
-void Shuffleboard::AddEventMarker(wpi::StringRef name,
+void Shuffleboard::AddEventMarker(std::string_view name,
                                   ShuffleboardEventImportance importance) {
   AddEventMarker(name, "", importance);
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardComponentBase.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardComponentBase.cpp
index 7617333..940f6ab 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardComponentBase.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardComponentBase.cpp
@@ -1,27 +1,18 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardComponentBase.h"
 
-#include <wpi/SmallVector.h>
-
 using namespace frc;
 
 ShuffleboardComponentBase::ShuffleboardComponentBase(
-    ShuffleboardContainer& parent, const wpi::Twine& title,
-    const wpi::Twine& type)
-    : ShuffleboardValue(title), m_parent(parent) {
-  wpi::SmallVector<char, 16> storage;
-  m_type = type.toStringRef(storage);
-}
+    ShuffleboardContainer& parent, std::string_view title,
+    std::string_view type)
+    : ShuffleboardValue(title), m_parent(parent), m_type(type) {}
 
-void ShuffleboardComponentBase::SetType(const wpi::Twine& type) {
-  wpi::SmallVector<char, 16> storage;
-  m_type = type.toStringRef(storage);
+void ShuffleboardComponentBase::SetType(std::string_view type) {
+  m_type = type;
   m_metadataDirty = true;
 }
 
@@ -68,7 +59,9 @@
   return m_parent;
 }
 
-const std::string& ShuffleboardComponentBase::GetType() const { return m_type; }
+const std::string& ShuffleboardComponentBase::GetType() const {
+  return m_type;
+}
 
 const wpi::StringMap<std::shared_ptr<nt::Value>>&
 ShuffleboardComponentBase::GetProperties() const {
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardContainer.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardContainer.cpp
index d73f635..004f7c5 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardContainer.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardContainer.cpp
@@ -1,20 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardContainer.h"
 
-#include <wpi/SmallVector.h>
-#include <wpi/raw_ostream.h>
+#include <wpi/sendable/SendableRegistry.h>
 
+#include "frc/Errors.h"
 #include "frc/shuffleboard/ComplexWidget.h"
 #include "frc/shuffleboard/ShuffleboardComponent.h"
 #include "frc/shuffleboard/ShuffleboardLayout.h"
 #include "frc/shuffleboard/SimpleWidget.h"
-#include "frc/smartdashboard/SendableRegistry.h"
 
 using namespace frc;
 
@@ -24,7 +20,7 @@
   return layoutStrings[static_cast<int>(layout)];
 }
 
-ShuffleboardContainer::ShuffleboardContainer(const wpi::Twine& title)
+ShuffleboardContainer::ShuffleboardContainer(std::string_view title)
     : ShuffleboardValue(title) {}
 
 const std::vector<std::unique_ptr<ShuffleboardComponentBase>>&
@@ -32,41 +28,37 @@
   return m_components;
 }
 
-ShuffleboardLayout& ShuffleboardContainer::GetLayout(const wpi::Twine& title,
+ShuffleboardLayout& ShuffleboardContainer::GetLayout(std::string_view title,
                                                      BuiltInLayouts type) {
   return GetLayout(title, GetStringFromBuiltInLayout(type));
 }
 
-ShuffleboardLayout& ShuffleboardContainer::GetLayout(const wpi::Twine& title,
+ShuffleboardLayout& ShuffleboardContainer::GetLayout(std::string_view title,
                                                      const LayoutType& type) {
   return GetLayout(title, type.GetLayoutName());
 }
 
-ShuffleboardLayout& ShuffleboardContainer::GetLayout(const wpi::Twine& title,
-                                                     const wpi::Twine& type) {
-  wpi::SmallVector<char, 16> storage;
-  auto titleRef = title.toStringRef(storage);
-  if (m_layouts.count(titleRef) == 0) {
-    auto layout = std::make_unique<ShuffleboardLayout>(*this, titleRef, type);
+ShuffleboardLayout& ShuffleboardContainer::GetLayout(std::string_view title,
+                                                     std::string_view type) {
+  if (m_layouts.count(title) == 0) {
+    auto layout = std::make_unique<ShuffleboardLayout>(*this, title, type);
     auto ptr = layout.get();
     m_components.emplace_back(std::move(layout));
-    m_layouts.insert(std::make_pair(titleRef, ptr));
+    m_layouts.insert(std::make_pair(title, ptr));
   }
-  return *m_layouts[titleRef];
+  return *m_layouts[title];
 }
 
-ShuffleboardLayout& ShuffleboardContainer::GetLayout(const wpi::Twine& title) {
-  wpi::SmallVector<char, 16> storage;
-  auto titleRef = title.toStringRef(storage);
-  if (m_layouts.count(titleRef) == 0) {
-    wpi_setWPIErrorWithContext(
-        InvalidParameter, "No layout with the given title has been defined");
+ShuffleboardLayout& ShuffleboardContainer::GetLayout(std::string_view title) {
+  if (m_layouts.count(title) == 0) {
+    throw FRC_MakeError(err::InvalidParameter,
+                        "No layout with title {} has been defined", title);
   }
-  return *m_layouts[titleRef];
+  return *m_layouts[title];
 }
 
-ComplexWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
-                                          Sendable& sendable) {
+ComplexWidget& ShuffleboardContainer::Add(std::string_view title,
+                                          wpi::Sendable& sendable) {
   CheckTitle(title);
   auto widget = std::make_unique<ComplexWidget>(*this, title, sendable);
   auto ptr = widget.get();
@@ -74,16 +66,16 @@
   return *ptr;
 }
 
-ComplexWidget& ShuffleboardContainer::Add(Sendable& sendable) {
-  auto name = SendableRegistry::GetInstance().GetName(&sendable);
+ComplexWidget& ShuffleboardContainer::Add(wpi::Sendable& sendable) {
+  auto name = wpi::SendableRegistry::GetName(&sendable);
   if (name.empty()) {
-    wpi::outs() << "Sendable must have a name\n";
+    FRC_ReportError(err::Error, "{}", "Sendable must have a name");
   }
   return Add(name, sendable);
 }
 
 SimpleWidget& ShuffleboardContainer::Add(
-    const wpi::Twine& title, std::shared_ptr<nt::Value> defaultValue) {
+    std::string_view title, std::shared_ptr<nt::Value> defaultValue) {
   CheckTitle(title);
 
   auto widget = std::make_unique<SimpleWidget>(*this, title);
@@ -93,48 +85,48 @@
   return *ptr;
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
                                          bool defaultValue) {
   return Add(title, nt::Value::MakeBoolean(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
                                          double defaultValue) {
   return Add(title, nt::Value::MakeDouble(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
                                          int defaultValue) {
   return Add(title, nt::Value::MakeDouble(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
-                                         const wpi::Twine& defaultValue) {
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
+                                         std::string_view defaultValue) {
   return Add(title, nt::Value::MakeString(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
                                          const char* defaultValue) {
   return Add(title, nt::Value::MakeString(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
-                                         wpi::ArrayRef<bool> defaultValue) {
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
+                                         wpi::span<const bool> defaultValue) {
   return Add(title, nt::Value::MakeBooleanArray(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::Add(const wpi::Twine& title,
-                                         wpi::ArrayRef<double> defaultValue) {
+SimpleWidget& ShuffleboardContainer::Add(std::string_view title,
+                                         wpi::span<const double> defaultValue) {
   return Add(title, nt::Value::MakeDoubleArray(defaultValue));
 }
 
 SimpleWidget& ShuffleboardContainer::Add(
-    const wpi::Twine& title, wpi::ArrayRef<std::string> defaultValue) {
+    std::string_view title, wpi::span<const std::string> defaultValue) {
   return Add(title, nt::Value::MakeStringArray(defaultValue));
 }
 
 SuppliedValueWidget<std::string>& ShuffleboardContainer::AddString(
-    const wpi::Twine& title, std::function<std::string()> supplier) {
+    std::string_view title, std::function<std::string()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry, std::string value) {
     entry.SetString(value);
   };
@@ -148,7 +140,7 @@
 }
 
 SuppliedValueWidget<double>& ShuffleboardContainer::AddNumber(
-    const wpi::Twine& title, std::function<double()> supplier) {
+    std::string_view title, std::function<double()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry, double value) {
     entry.SetDouble(value);
   };
@@ -162,7 +154,7 @@
 }
 
 SuppliedValueWidget<bool>& ShuffleboardContainer::AddBoolean(
-    const wpi::Twine& title, std::function<bool()> supplier) {
+    std::string_view title, std::function<bool()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry, bool value) {
     entry.SetBoolean(value);
   };
@@ -177,7 +169,7 @@
 
 SuppliedValueWidget<std::vector<std::string>>&
 ShuffleboardContainer::AddStringArray(
-    const wpi::Twine& title,
+    std::string_view title,
     std::function<std::vector<std::string>()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry,
                           std::vector<std::string> value) {
@@ -193,7 +185,7 @@
 }
 
 SuppliedValueWidget<std::vector<double>>& ShuffleboardContainer::AddNumberArray(
-    const wpi::Twine& title, std::function<std::vector<double>()> supplier) {
+    std::string_view title, std::function<std::vector<double>()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry,
                           std::vector<double> value) {
     entry.SetDoubleArray(value);
@@ -208,7 +200,7 @@
 }
 
 SuppliedValueWidget<std::vector<int>>& ShuffleboardContainer::AddBooleanArray(
-    const wpi::Twine& title, std::function<std::vector<int>()> supplier) {
+    std::string_view title, std::function<std::vector<int>()> supplier) {
   static auto setter = [](nt::NetworkTableEntry entry, std::vector<int> value) {
     entry.SetBooleanArray(value);
   };
@@ -221,14 +213,14 @@
   return *ptr;
 }
 
-SuppliedValueWidget<wpi::StringRef>& ShuffleboardContainer::AddRaw(
-    const wpi::Twine& title, std::function<wpi::StringRef()> supplier) {
-  static auto setter = [](nt::NetworkTableEntry entry, wpi::StringRef value) {
+SuppliedValueWidget<std::string_view>& ShuffleboardContainer::AddRaw(
+    std::string_view title, std::function<std::string_view()> supplier) {
+  static auto setter = [](nt::NetworkTableEntry entry, std::string_view value) {
     entry.SetRaw(value);
   };
 
   CheckTitle(title);
-  auto widget = std::make_unique<SuppliedValueWidget<wpi::StringRef>>(
+  auto widget = std::make_unique<SuppliedValueWidget<std::string_view>>(
       *this, title, supplier, setter);
   auto ptr = widget.get();
   m_components.emplace_back(std::move(widget));
@@ -236,44 +228,44 @@
 }
 
 SimpleWidget& ShuffleboardContainer::AddPersistent(
-    const wpi::Twine& title, std::shared_ptr<nt::Value> defaultValue) {
+    std::string_view title, std::shared_ptr<nt::Value> defaultValue) {
   auto& widget = Add(title, defaultValue);
   widget.GetEntry().SetPersistent();
   return widget;
 }
 
-SimpleWidget& ShuffleboardContainer::AddPersistent(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::AddPersistent(std::string_view title,
                                                    bool defaultValue) {
   return AddPersistent(title, nt::Value::MakeBoolean(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::AddPersistent(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::AddPersistent(std::string_view title,
                                                    double defaultValue) {
   return AddPersistent(title, nt::Value::MakeDouble(defaultValue));
 }
 
-SimpleWidget& ShuffleboardContainer::AddPersistent(const wpi::Twine& title,
+SimpleWidget& ShuffleboardContainer::AddPersistent(std::string_view title,
                                                    int defaultValue) {
   return AddPersistent(title, nt::Value::MakeDouble(defaultValue));
 }
 
 SimpleWidget& ShuffleboardContainer::AddPersistent(
-    const wpi::Twine& title, const wpi::Twine& defaultValue) {
+    std::string_view title, std::string_view defaultValue) {
   return AddPersistent(title, nt::Value::MakeString(defaultValue));
 }
 
 SimpleWidget& ShuffleboardContainer::AddPersistent(
-    const wpi::Twine& title, wpi::ArrayRef<bool> defaultValue) {
+    std::string_view title, wpi::span<const bool> defaultValue) {
   return AddPersistent(title, nt::Value::MakeBooleanArray(defaultValue));
 }
 
 SimpleWidget& ShuffleboardContainer::AddPersistent(
-    const wpi::Twine& title, wpi::ArrayRef<double> defaultValue) {
+    std::string_view title, wpi::span<const double> defaultValue) {
   return AddPersistent(title, nt::Value::MakeDoubleArray(defaultValue));
 }
 
 SimpleWidget& ShuffleboardContainer::AddPersistent(
-    const wpi::Twine& title, wpi::ArrayRef<std::string> defaultValue) {
+    std::string_view title, wpi::span<const std::string> defaultValue) {
   return AddPersistent(title, nt::Value::MakeStringArray(defaultValue));
 }
 
@@ -289,12 +281,11 @@
   }
 }
 
-void ShuffleboardContainer::CheckTitle(const wpi::Twine& title) {
-  wpi::SmallVector<char, 16> storage;
-  auto titleRef = title.toStringRef(storage);
-  if (m_usedTitles.count(titleRef) > 0) {
-    wpi::errs() << "Title is already in use: " << title << "\n";
+void ShuffleboardContainer::CheckTitle(std::string_view title) {
+  std::string titleStr{title};
+  if (m_usedTitles.count(titleStr) > 0) {
+    FRC_ReportError(err::Error, "Title is already in use: {}", title);
     return;
   }
-  m_usedTitles.insert(titleRef);
+  m_usedTitles.insert(titleStr);
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardInstance.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardInstance.cpp
index 3316b3e..083b4a2 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardInstance.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardInstance.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardInstance.h"
 
@@ -18,7 +15,7 @@
 using namespace frc::detail;
 
 struct ShuffleboardInstance::Impl {
-  wpi::StringMap<ShuffleboardTab> tabs;
+  wpi::StringMap<std::unique_ptr<ShuffleboardTab>> tabs;
 
   bool tabsChanged = false;
   std::shared_ptr<nt::NetworkTable> rootTable;
@@ -32,27 +29,28 @@
   HAL_Report(HALUsageReporting::kResourceType_Shuffleboard, 0);
 }
 
-ShuffleboardInstance::~ShuffleboardInstance() {}
+ShuffleboardInstance::~ShuffleboardInstance() = default;
 
-frc::ShuffleboardTab& ShuffleboardInstance::GetTab(wpi::StringRef title) {
+frc::ShuffleboardTab& ShuffleboardInstance::GetTab(std::string_view title) {
   if (m_impl->tabs.find(title) == m_impl->tabs.end()) {
-    m_impl->tabs.try_emplace(title, ShuffleboardTab(*this, title));
+    m_impl->tabs.try_emplace(title,
+                             std::make_unique<ShuffleboardTab>(*this, title));
     m_impl->tabsChanged = true;
   }
-  return m_impl->tabs.find(title)->second;
+  return *m_impl->tabs.find(title)->second;
 }
 
 void ShuffleboardInstance::Update() {
   if (m_impl->tabsChanged) {
     wpi::SmallVector<std::string, 16> tabTitles;
     for (auto& entry : m_impl->tabs) {
-      tabTitles.emplace_back(entry.second.GetTitle());
+      tabTitles.emplace_back(entry.second->GetTitle());
     }
     m_impl->rootMetaTable->GetEntry("Tabs").ForceSetStringArray(tabTitles);
     m_impl->tabsChanged = false;
   }
   for (auto& entry : m_impl->tabs) {
-    auto& tab = entry.second;
+    auto& tab = *entry.second;
     tab.BuildInto(m_impl->rootTable,
                   m_impl->rootMetaTable->GetSubTable(tab.GetTitle()));
   }
@@ -60,7 +58,7 @@
 
 void ShuffleboardInstance::EnableActuatorWidgets() {
   for (auto& entry : m_impl->tabs) {
-    auto& tab = entry.second;
+    auto& tab = *entry.second;
     for (auto& component : tab.GetComponents()) {
       component->EnableIfActuator();
     }
@@ -69,7 +67,7 @@
 
 void ShuffleboardInstance::DisableActuatorWidgets() {
   for (auto& entry : m_impl->tabs) {
-    auto& tab = entry.second;
+    auto& tab = *entry.second;
     for (auto& component : tab.GetComponents()) {
       component->DisableIfActuator();
     }
@@ -80,6 +78,6 @@
   m_impl->rootMetaTable->GetEntry("Selected").ForceSetDouble(index);
 }
 
-void ShuffleboardInstance::SelectTab(wpi::StringRef title) {
+void ShuffleboardInstance::SelectTab(std::string_view title) {
   m_impl->rootMetaTable->GetEntry("Selected").ForceSetString(title);
 }
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardLayout.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardLayout.cpp
index 1cbfb80..c4c933e 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardLayout.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardLayout.cpp
@@ -1,17 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardLayout.h"
 
 using namespace frc;
 
 ShuffleboardLayout::ShuffleboardLayout(ShuffleboardContainer& parent,
-                                       const wpi::Twine& title,
-                                       const wpi::Twine& type)
+                                       std::string_view title,
+                                       std::string_view type)
     : ShuffleboardValue(title),
       ShuffleboardComponent(parent, title, type),
       ShuffleboardContainer(title) {
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp
index 7a8338e..61e0e45 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardTab.cpp
@@ -1,18 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardTab.h"
 
 using namespace frc;
 
-ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title)
+ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, std::string_view title)
     : ShuffleboardValue(title), ShuffleboardContainer(title), m_root(root) {}
 
-ShuffleboardRoot& ShuffleboardTab::GetRoot() { return m_root; }
+ShuffleboardRoot& ShuffleboardTab::GetRoot() {
+  return m_root;
+}
 
 void ShuffleboardTab::BuildInto(std::shared_ptr<nt::NetworkTable> parentTable,
                                 std::shared_ptr<nt::NetworkTable> metaTable) {
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardWidget.cpp b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardWidget.cpp
index 3b79a9c..81f6671 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardWidget.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/ShuffleboardWidget.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/ShuffleboardWidget.h"
 
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/SimpleWidget.cpp b/wpilibc/src/main/native/cpp/shuffleboard/SimpleWidget.cpp
index 89af25d..390c9c4 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/SimpleWidget.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/SimpleWidget.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/SimpleWidget.h"
 
@@ -14,7 +11,7 @@
 using namespace frc;
 
 SimpleWidget::SimpleWidget(ShuffleboardContainer& parent,
-                           const wpi::Twine& title)
+                           std::string_view title)
     : ShuffleboardValue(title), ShuffleboardWidget(parent, title), m_entry() {}
 
 nt::NetworkTableEntry SimpleWidget::GetEntry() {
diff --git a/wpilibc/src/main/native/cpp/shuffleboard/WidgetType.cpp b/wpilibc/src/main/native/cpp/shuffleboard/WidgetType.cpp
index cb73d30..3062cba 100644
--- a/wpilibc/src/main/native/cpp/shuffleboard/WidgetType.cpp
+++ b/wpilibc/src/main/native/cpp/shuffleboard/WidgetType.cpp
@@ -1,12 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/shuffleboard/WidgetType.h"
 
 using namespace frc;
 
-wpi::StringRef WidgetType::GetWidgetName() const { return m_widgetName; }
+std::string_view WidgetType::GetWidgetName() const {
+  return m_widgetName;
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/ADXL345Sim.cpp b/wpilibc/src/main/native/cpp/simulation/ADXL345Sim.cpp
new file mode 100644
index 0000000..27f9c1f
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/ADXL345Sim.cpp
@@ -0,0 +1,38 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/ADXL345Sim.h"
+
+#include "frc/ADXL345_I2C.h"
+#include "frc/ADXL345_SPI.h"
+#include "frc/simulation/SimDeviceSim.h"
+
+using namespace frc::sim;
+
+ADXL345Sim::ADXL345Sim(const frc::ADXL345_I2C& accel) {
+  frc::sim::SimDeviceSim deviceSim{"Accel:ADXL345_I2C", accel.GetI2CPort(),
+                                   accel.GetI2CDeviceAddress()};
+  m_simX = deviceSim.GetDouble("x");
+  m_simY = deviceSim.GetDouble("y");
+  m_simZ = deviceSim.GetDouble("z");
+}
+
+ADXL345Sim::ADXL345Sim(const frc::ADXL345_SPI& accel) {
+  frc::sim::SimDeviceSim deviceSim{"Accel:ADXL345_SPI", accel.GetSpiPort()};
+  m_simX = deviceSim.GetDouble("x");
+  m_simY = deviceSim.GetDouble("y");
+  m_simZ = deviceSim.GetDouble("z");
+}
+
+void ADXL345Sim::SetX(double accel) {
+  m_simX.Set(accel);
+}
+
+void ADXL345Sim::SetY(double accel) {
+  m_simY.Set(accel);
+}
+
+void ADXL345Sim::SetZ(double accel) {
+  m_simZ.Set(accel);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/ADXL362Sim.cpp b/wpilibc/src/main/native/cpp/simulation/ADXL362Sim.cpp
new file mode 100644
index 0000000..ac5bb5a
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/ADXL362Sim.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/ADXL362Sim.h"
+
+#include "frc/ADXL362.h"
+#include "frc/simulation/SimDeviceSim.h"
+
+using namespace frc::sim;
+
+ADXL362Sim::ADXL362Sim(const frc::ADXL362& accel) {
+  frc::sim::SimDeviceSim deviceSim{"Accel:ADXL362", accel.GetSpiPort()};
+  m_simX = deviceSim.GetDouble("x");
+  m_simY = deviceSim.GetDouble("y");
+  m_simZ = deviceSim.GetDouble("z");
+}
+
+void ADXL362Sim::SetX(double accel) {
+  m_simX.Set(accel);
+}
+
+void ADXL362Sim::SetY(double accel) {
+  m_simY.Set(accel);
+}
+
+void ADXL362Sim::SetZ(double accel) {
+  m_simZ.Set(accel);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/ADXRS450_GyroSim.cpp b/wpilibc/src/main/native/cpp/simulation/ADXRS450_GyroSim.cpp
index 74a5180..a21d1b7 100644
--- a/wpilibc/src/main/native/cpp/simulation/ADXRS450_GyroSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/ADXRS450_GyroSim.cpp
@@ -1,33 +1,24 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/ADXRS450_GyroSim.h"
 
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
-
 #include "frc/ADXRS450_Gyro.h"
 #include "frc/simulation/SimDeviceSim.h"
 
 using namespace frc::sim;
 
 ADXRS450_GyroSim::ADXRS450_GyroSim(const frc::ADXRS450_Gyro& gyro) {
-  wpi::SmallString<128> fullname;
-  wpi::raw_svector_ostream os(fullname);
-  os << "ADXRS450_Gyro" << '[' << gyro.GetPort() << ']';
-  frc::sim::SimDeviceSim deviceSim{fullname.c_str()};
-  m_simAngle = deviceSim.GetDouble("Angle");
-  m_simRate = deviceSim.GetDouble("Rate");
+  frc::sim::SimDeviceSim deviceSim{"Gyro:ADXRS450", gyro.GetPort()};
+  m_simAngle = deviceSim.GetDouble("angle_x");
+  m_simRate = deviceSim.GetDouble("rate_x");
 }
 
 void ADXRS450_GyroSim::SetAngle(units::degree_t angle) {
-  m_simAngle.Set(angle.to<double>());
+  m_simAngle.Set(angle.value());
 }
 
 void ADXRS450_GyroSim::SetRate(units::degrees_per_second_t rate) {
-  m_simRate.Set(rate.to<double>());
+  m_simRate.Set(rate.value());
 }
diff --git a/wpilibc/src/main/native/cpp/simulation/AddressableLEDSim.cpp b/wpilibc/src/main/native/cpp/simulation/AddressableLEDSim.cpp
index 743c51d..8114bb3 100644
--- a/wpilibc/src/main/native/cpp/simulation/AddressableLEDSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AddressableLEDSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AddressableLEDSim.h"
 
@@ -23,8 +20,9 @@
 
 AddressableLEDSim AddressableLEDSim::CreateForChannel(int pwmChannel) {
   int index = HALSIM_FindAddressableLEDForChannel(pwmChannel);
-  if (index < 0)
+  if (index < 0) {
     throw std::out_of_range("no addressable LED found for PWM channel");
+  }
   return AddressableLEDSim{index};
 }
 
@@ -101,7 +99,7 @@
 }
 
 std::unique_ptr<CallbackStore> AddressableLEDSim::RegisterDataCallback(
-    NotifyCallback callback, bool initialNotify) {
+    ConstBufferCallback callback, bool initialNotify) {
   auto store = std::make_unique<CallbackStore>(
       m_index, -1, callback, &HALSIM_CancelAddressableLEDDataCallback);
   store->SetUid(HALSIM_RegisterAddressableLEDDataCallback(
diff --git a/wpilibc/src/main/native/cpp/simulation/AnalogEncoderSim.cpp b/wpilibc/src/main/native/cpp/simulation/AnalogEncoderSim.cpp
index 5fee737..049241e 100644
--- a/wpilibc/src/main/native/cpp/simulation/AnalogEncoderSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AnalogEncoderSim.cpp
@@ -1,25 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AnalogEncoderSim.h"
 
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
-
 #include "frc/AnalogEncoder.h"
 #include "frc/simulation/SimDeviceSim.h"
 
 using namespace frc::sim;
 
 AnalogEncoderSim::AnalogEncoderSim(const frc::AnalogEncoder& encoder) {
-  wpi::SmallString<128> fullname;
-  wpi::raw_svector_ostream os(fullname);
-  os << "AnalogEncoder" << '[' << encoder.GetChannel() << ']';
-  frc::sim::SimDeviceSim deviceSim{fullname.c_str()};
+  frc::sim::SimDeviceSim deviceSim{"AnalogEncoder", encoder.GetChannel()};
   m_positionSim = deviceSim.GetDouble("Position");
 }
 
@@ -28,7 +19,7 @@
 }
 
 void AnalogEncoderSim::SetTurns(units::turn_t turns) {
-  m_positionSim.Set(turns.to<double>());
+  m_positionSim.Set(turns.value());
 }
 
 units::turn_t AnalogEncoderSim::GetTurns() {
diff --git a/wpilibc/src/main/native/cpp/simulation/AnalogGyroSim.cpp b/wpilibc/src/main/native/cpp/simulation/AnalogGyroSim.cpp
index b7cab6b..625a3c0 100644
--- a/wpilibc/src/main/native/cpp/simulation/AnalogGyroSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AnalogGyroSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AnalogGyroSim.h"
 
@@ -74,4 +71,6 @@
   HALSIM_SetAnalogGyroInitialized(m_index, initialized);
 }
 
-void AnalogGyroSim::ResetData() { HALSIM_ResetAnalogGyroData(m_index); }
+void AnalogGyroSim::ResetData() {
+  HALSIM_ResetAnalogGyroData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/AnalogInputSim.cpp b/wpilibc/src/main/native/cpp/simulation/AnalogInputSim.cpp
index 057a188..14a6596 100644
--- a/wpilibc/src/main/native/cpp/simulation/AnalogInputSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AnalogInputSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AnalogInputSim.h"
 
@@ -179,4 +176,6 @@
   HALSIM_SetAnalogInAccumulatorDeadband(m_index, accumulatorDeadband);
 }
 
-void AnalogInputSim::ResetData() { HALSIM_ResetAnalogInData(m_index); }
+void AnalogInputSim::ResetData() {
+  HALSIM_ResetAnalogInData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/AnalogOutputSim.cpp b/wpilibc/src/main/native/cpp/simulation/AnalogOutputSim.cpp
index 4de9082..c2b01cf 100644
--- a/wpilibc/src/main/native/cpp/simulation/AnalogOutputSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AnalogOutputSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AnalogOutputSim.h"
 
@@ -56,4 +53,6 @@
   HALSIM_SetAnalogOutInitialized(m_index, initialized);
 }
 
-void AnalogOutputSim::ResetData() { HALSIM_ResetAnalogOutData(m_index); }
+void AnalogOutputSim::ResetData() {
+  HALSIM_ResetAnalogOutData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/AnalogTriggerSim.cpp b/wpilibc/src/main/native/cpp/simulation/AnalogTriggerSim.cpp
index 3325827..09e0a8d 100644
--- a/wpilibc/src/main/native/cpp/simulation/AnalogTriggerSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/AnalogTriggerSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/AnalogTriggerSim.h"
 
@@ -23,7 +20,9 @@
 
 AnalogTriggerSim AnalogTriggerSim::CreateForChannel(int channel) {
   int index = HALSIM_FindAnalogTriggerForChannel(channel);
-  if (index < 0) throw std::out_of_range("no analog trigger found for channel");
+  if (index < 0) {
+    throw std::out_of_range("no analog trigger found for channel");
+  }
   return AnalogTriggerSim{index};
 }
 
@@ -86,4 +85,6 @@
   HALSIM_SetAnalogTriggerTriggerUpperBound(m_index, triggerUpperBound);
 }
 
-void AnalogTriggerSim::ResetData() { HALSIM_ResetAnalogTriggerData(m_index); }
+void AnalogTriggerSim::ResetData() {
+  HALSIM_ResetAnalogTriggerData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/BuiltInAccelerometerSim.cpp b/wpilibc/src/main/native/cpp/simulation/BuiltInAccelerometerSim.cpp
index 601ee6e..0f6aa88 100644
--- a/wpilibc/src/main/native/cpp/simulation/BuiltInAccelerometerSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/BuiltInAccelerometerSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/BuiltInAccelerometerSim.h"
 
diff --git a/wpilibc/src/main/native/cpp/simulation/CTREPCMSim.cpp b/wpilibc/src/main/native/cpp/simulation/CTREPCMSim.cpp
new file mode 100644
index 0000000..9c7450b
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/CTREPCMSim.cpp
@@ -0,0 +1,139 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/CTREPCMSim.h"
+
+#include <memory>
+#include <utility>
+
+#include <hal/simulation/CTREPCMData.h>
+
+#include "frc/SensorUtil.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+CTREPCMSim::CTREPCMSim() : m_index{SensorUtil::GetDefaultCTREPCMModule()} {}
+
+CTREPCMSim::CTREPCMSim(int module) : m_index{module} {}
+
+CTREPCMSim::CTREPCMSim(const PneumaticsBase& pneumatics)
+    : m_index{pneumatics.GetModuleNumber()} {}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterInitializedCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelCTREPCMInitializedCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMInitializedCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool CTREPCMSim::GetInitialized() const {
+  return HALSIM_GetCTREPCMInitialized(m_index);
+}
+
+void CTREPCMSim::SetInitialized(bool solenoidInitialized) {
+  HALSIM_SetCTREPCMInitialized(m_index, solenoidInitialized);
+}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterSolenoidOutputCallback(
+    int channel, NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, channel, -1, callback,
+      &HALSIM_CancelCTREPCMSolenoidOutputCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMSolenoidOutputCallback(
+      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool CTREPCMSim::GetSolenoidOutput(int channel) const {
+  return HALSIM_GetCTREPCMSolenoidOutput(m_index, channel);
+}
+
+void CTREPCMSim::SetSolenoidOutput(int channel, bool solenoidOutput) {
+  HALSIM_SetCTREPCMSolenoidOutput(m_index, channel, solenoidOutput);
+}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterCompressorOnCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelCTREPCMCompressorOnCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMCompressorOnCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool CTREPCMSim::GetCompressorOn() const {
+  return HALSIM_GetCTREPCMCompressorOn(m_index);
+}
+
+void CTREPCMSim::SetCompressorOn(bool compressorOn) {
+  HALSIM_SetCTREPCMCompressorOn(m_index, compressorOn);
+}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterClosedLoopEnabledCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelCTREPCMClosedLoopEnabledCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMClosedLoopEnabledCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool CTREPCMSim::GetClosedLoopEnabled() const {
+  return HALSIM_GetCTREPCMClosedLoopEnabled(m_index);
+}
+
+void CTREPCMSim::SetClosedLoopEnabled(bool closedLoopEnabled) {
+  HALSIM_SetCTREPCMClosedLoopEnabled(m_index, closedLoopEnabled);
+}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterPressureSwitchCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelCTREPCMPressureSwitchCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMPressureSwitchCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool CTREPCMSim::GetPressureSwitch() const {
+  return HALSIM_GetCTREPCMPressureSwitch(m_index);
+}
+
+void CTREPCMSim::SetPressureSwitch(bool pressureSwitch) {
+  HALSIM_SetCTREPCMPressureSwitch(m_index, pressureSwitch);
+}
+
+std::unique_ptr<CallbackStore> CTREPCMSim::RegisterCompressorCurrentCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelCTREPCMCompressorCurrentCallback);
+  store->SetUid(HALSIM_RegisterCTREPCMCompressorCurrentCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double CTREPCMSim::GetCompressorCurrent() const {
+  return HALSIM_GetCTREPCMCompressorCurrent(m_index);
+}
+
+void CTREPCMSim::SetCompressorCurrent(double compressorCurrent) {
+  HALSIM_SetCTREPCMCompressorCurrent(m_index, compressorCurrent);
+}
+
+uint8_t CTREPCMSim::GetAllSolenoidOutputs() const {
+  uint8_t ret = 0;
+  HALSIM_GetCTREPCMAllSolenoids(m_index, &ret);
+  return ret;
+}
+
+void CTREPCMSim::SetAllSolenoidOutputs(uint8_t outputs) {
+  HALSIM_SetCTREPCMAllSolenoids(m_index, outputs);
+}
+
+void CTREPCMSim::ResetData() {
+  HALSIM_ResetCTREPCMData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/CallbackStore.cpp b/wpilibc/src/main/native/cpp/simulation/CallbackStore.cpp
index 5c38372..be071e9 100644
--- a/wpilibc/src/main/native/cpp/simulation/CallbackStore.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/CallbackStore.cpp
@@ -1,12 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/CallbackStore.h"
 
+#include <utility>
+
 using namespace frc;
 using namespace frc::sim;
 
@@ -24,31 +23,35 @@
 
 CallbackStore::CallbackStore(int32_t i, NotifyCallback cb,
                              CancelCallbackNoIndexFunc ccf)
-    : index(i), callback(cb), cancelType(NoIndex) {
+    : index(i), callback(std::move(cb)), cancelType(NoIndex) {
   this->ccnif = ccf;
 }
 
 CallbackStore::CallbackStore(int32_t i, int32_t u, NotifyCallback cb,
                              CancelCallbackFunc ccf)
-    : index(i), uid(u), callback(cb), cancelType(Normal) {
+    : index(i), uid(u), callback(std::move(cb)), cancelType(Normal) {
   this->ccf = ccf;
 }
 
 CallbackStore::CallbackStore(int32_t i, int32_t c, int32_t u, NotifyCallback cb,
                              CancelCallbackChannelFunc ccf)
-    : index(i), channel(c), uid(u), callback(cb), cancelType(Channel) {
+    : index(i),
+      channel(c),
+      uid(u),
+      callback(std::move(cb)),
+      cancelType(Channel) {
   this->cccf = ccf;
 }
 
 CallbackStore::CallbackStore(int32_t i, ConstBufferCallback cb,
                              CancelCallbackNoIndexFunc ccf)
-    : index(i), constBufferCallback(cb), cancelType(NoIndex) {
+    : index(i), constBufferCallback(std::move(cb)), cancelType(NoIndex) {
   this->ccnif = ccf;
 }
 
 CallbackStore::CallbackStore(int32_t i, int32_t u, ConstBufferCallback cb,
                              CancelCallbackFunc ccf)
-    : index(i), uid(u), constBufferCallback(cb), cancelType(Normal) {
+    : index(i), uid(u), constBufferCallback(std::move(cb)), cancelType(Normal) {
   this->ccf = ccf;
 }
 
@@ -58,7 +61,7 @@
     : index(i),
       channel(c),
       uid(u),
-      constBufferCallback(cb),
+      constBufferCallback(std::move(cb)),
       cancelType(Channel) {
   this->cccf = ccf;
 }
@@ -77,4 +80,6 @@
   }
 }
 
-void CallbackStore::SetUid(int32_t uid) { this->uid = uid; }
+void CallbackStore::SetUid(int32_t uid) {
+  this->uid = uid;
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/DIOSim.cpp b/wpilibc/src/main/native/cpp/simulation/DIOSim.cpp
index 9330735..8b73b7c 100644
--- a/wpilibc/src/main/native/cpp/simulation/DIOSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DIOSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DIOSim.h"
 
@@ -50,9 +47,13 @@
   return store;
 }
 
-bool DIOSim::GetValue() const { return HALSIM_GetDIOValue(m_index); }
+bool DIOSim::GetValue() const {
+  return HALSIM_GetDIOValue(m_index);
+}
 
-void DIOSim::SetValue(bool value) { HALSIM_SetDIOValue(m_index, value); }
+void DIOSim::SetValue(bool value) {
+  HALSIM_SetDIOValue(m_index, value);
+}
 
 std::unique_ptr<CallbackStore> DIOSim::RegisterPulseLengthCallback(
     NotifyCallback callback, bool initialNotify) {
@@ -80,7 +81,9 @@
   return store;
 }
 
-bool DIOSim::GetIsInput() const { return HALSIM_GetDIOIsInput(m_index); }
+bool DIOSim::GetIsInput() const {
+  return HALSIM_GetDIOIsInput(m_index);
+}
 
 void DIOSim::SetIsInput(bool isInput) {
   HALSIM_SetDIOIsInput(m_index, isInput);
@@ -95,10 +98,14 @@
   return store;
 }
 
-int DIOSim::GetFilterIndex() const { return HALSIM_GetDIOFilterIndex(m_index); }
+int DIOSim::GetFilterIndex() const {
+  return HALSIM_GetDIOFilterIndex(m_index);
+}
 
 void DIOSim::SetFilterIndex(int filterIndex) {
   HALSIM_SetDIOFilterIndex(m_index, filterIndex);
 }
 
-void DIOSim::ResetData() { HALSIM_ResetDIOData(m_index); }
+void DIOSim::ResetData() {
+  HALSIM_ResetDIOData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/DifferentialDrivetrainSim.cpp b/wpilibc/src/main/native/cpp/simulation/DifferentialDrivetrainSim.cpp
index 51ed94a..0bbf9c3 100644
--- a/wpilibc/src/main/native/cpp/simulation/DifferentialDrivetrainSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DifferentialDrivetrainSim.cpp
@@ -1,44 +1,56 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DifferentialDrivetrainSim.h"
 
 #include <frc/system/plant/LinearSystemId.h>
 
-#include "frc/system/RungeKutta.h"
+#include <utility>
+
+#include <wpi/MathExtras.h>
+
+#include "frc/RobotController.h"
+#include "frc/system/NumericalIntegration.h"
 
 using namespace frc;
 using namespace frc::sim;
 
 DifferentialDrivetrainSim::DifferentialDrivetrainSim(
-    const LinearSystem<2, 2, 2>& plant, units::meter_t trackWidth,
-    DCMotor driveMotor, double gearRatio, units::meter_t wheelRadius)
-    : m_plant(plant),
+    LinearSystem<2, 2, 2> plant, units::meter_t trackWidth, DCMotor driveMotor,
+    double gearRatio, units::meter_t wheelRadius,
+    const std::array<double, 7>& measurementStdDevs)
+    : m_plant(std::move(plant)),
       m_rb(trackWidth / 2.0),
       m_wheelRadius(wheelRadius),
       m_motor(driveMotor),
       m_originalGearing(gearRatio),
-      m_currentGearing(gearRatio) {
+      m_currentGearing(gearRatio),
+      m_measurementStdDevs(measurementStdDevs) {
   m_x.setZero();
   m_u.setZero();
+  m_y.setZero();
 }
 
 DifferentialDrivetrainSim::DifferentialDrivetrainSim(
     frc::DCMotor driveMotor, double gearing, units::kilogram_square_meter_t J,
     units::kilogram_t mass, units::meter_t wheelRadius,
-    units::meter_t trackWidth)
+    units::meter_t trackWidth, const std::array<double, 7>& measurementStdDevs)
     : DifferentialDrivetrainSim(
           frc::LinearSystemId::DrivetrainVelocitySystem(
               driveMotor, mass, wheelRadius, trackWidth / 2.0, J, gearing),
-          trackWidth, driveMotor, gearing, wheelRadius) {}
+          trackWidth, driveMotor, gearing, wheelRadius, measurementStdDevs) {}
+
+Eigen::Vector<double, 2> DifferentialDrivetrainSim::ClampInput(
+    const Eigen::Vector<double, 2>& u) {
+  return frc::NormalizeInputVector<2>(u,
+                                      frc::RobotController::GetInputVoltage());
+}
 
 void DifferentialDrivetrainSim::SetInputs(units::volt_t leftVoltage,
                                           units::volt_t rightVoltage) {
-  m_u << leftVoltage.to<double>(), rightVoltage.to<double>();
+  m_u << leftVoltage.value(), rightVoltage.value();
+  m_u = ClampInput(m_u);
 }
 
 void DifferentialDrivetrainSim::SetGearing(double newGearing) {
@@ -46,65 +58,79 @@
 }
 
 void DifferentialDrivetrainSim::Update(units::second_t dt) {
-  m_x = RungeKutta([this](auto& x, auto& u) { return Dynamics(x, u); }, m_x,
-                   m_u, dt);
-}
-
-double DifferentialDrivetrainSim::GetState(int state) const {
-  return m_x(state);
+  m_x = RK4([this](auto& x, auto& u) { return Dynamics(x, u); }, m_x, m_u, dt);
+  m_y = m_x + frc::MakeWhiteNoiseVector<7>(m_measurementStdDevs);
 }
 
 double DifferentialDrivetrainSim::GetGearing() const {
   return m_currentGearing;
 }
 
-Eigen::Matrix<double, 7, 1> DifferentialDrivetrainSim::GetState() const {
+Eigen::Vector<double, 7> DifferentialDrivetrainSim::GetOutput() const {
+  return m_y;
+}
+
+Eigen::Vector<double, 7> DifferentialDrivetrainSim::GetState() const {
   return m_x;
 }
 
+double DifferentialDrivetrainSim::GetOutput(int output) const {
+  return m_y(output);
+}
+
+double DifferentialDrivetrainSim::GetState(int state) const {
+  return m_x(state);
+}
+
 Rotation2d DifferentialDrivetrainSim::GetHeading() const {
-  return Rotation2d(units::radian_t(m_x(State::kHeading)));
+  return Rotation2d(units::radian_t(GetOutput(State::kHeading)));
 }
 
 Pose2d DifferentialDrivetrainSim::GetPose() const {
-  return Pose2d(units::meter_t(m_x(State::kX)), units::meter_t(m_x(State::kY)),
-                Rotation2d(units::radian_t(m_x(State::kHeading))));
+  return Pose2d(units::meter_t(GetOutput(State::kX)),
+                units::meter_t(GetOutput(State::kY)), GetHeading());
 }
 
-units::ampere_t DifferentialDrivetrainSim::GetCurrentDraw() const {
+units::ampere_t DifferentialDrivetrainSim::GetLeftCurrentDraw() const {
   auto loadIleft =
-      m_motor.Current(units::radians_per_second_t(m_x(State::kLeftVelocity) *
-                                                  m_currentGearing /
-                                                  m_wheelRadius.to<double>()),
-                      units::volt_t(m_u(0))) *
+      m_motor.Current(
+          units::radians_per_second_t(m_x(State::kLeftVelocity) *
+                                      m_currentGearing / m_wheelRadius.value()),
+          units::volt_t(m_u(0))) *
       wpi::sgn(m_u(0));
 
+  return loadIleft;
+}
+
+units::ampere_t DifferentialDrivetrainSim::GetRightCurrentDraw() const {
   auto loadIRight =
-      m_motor.Current(units::radians_per_second_t(m_x(State::kRightVelocity) *
-                                                  m_currentGearing /
-                                                  m_wheelRadius.to<double>()),
-                      units::volt_t(m_u(1))) *
+      m_motor.Current(
+          units::radians_per_second_t(m_x(State::kRightVelocity) *
+                                      m_currentGearing / m_wheelRadius.value()),
+          units::volt_t(m_u(1))) *
       wpi::sgn(m_u(1));
 
-  return loadIleft + loadIRight;
+  return loadIRight;
+}
+units::ampere_t DifferentialDrivetrainSim::GetCurrentDraw() const {
+  return GetLeftCurrentDraw() + GetRightCurrentDraw();
 }
 
 void DifferentialDrivetrainSim::SetState(
-    const Eigen::Matrix<double, 7, 1>& state) {
+    const Eigen::Vector<double, 7>& state) {
   m_x = state;
 }
 
 void DifferentialDrivetrainSim::SetPose(const frc::Pose2d& pose) {
-  m_x(State::kX) = pose.X().to<double>();
-  m_x(State::kY) = pose.Y().to<double>();
-  m_x(State::kHeading) = pose.Rotation().Radians().to<double>();
+  m_x(State::kX) = pose.X().value();
+  m_x(State::kY) = pose.Y().value();
+  m_x(State::kHeading) = pose.Rotation().Radians().value();
   m_x(State::kLeftPosition) = 0;
   m_x(State::kRightPosition) = 0;
 }
 
-Eigen::Matrix<double, 7, 1> DifferentialDrivetrainSim::Dynamics(
-    const Eigen::Matrix<double, 7, 1>& x,
-    const Eigen::Matrix<double, 2, 1>& u) {
+Eigen::Vector<double, 7> DifferentialDrivetrainSim::Dynamics(
+    const Eigen::Vector<double, 7>& x, const Eigen::Vector<double, 2>& u) {
   // Because G^2 can be factored out of A, we can divide by the old ratio
   // squared and multiply by the new ratio squared to get a new drivetrain
   // model.
@@ -123,12 +149,12 @@
 
   double v = (x(State::kLeftVelocity) + x(State::kRightVelocity)) / 2.0;
 
-  Eigen::Matrix<double, 7, 1> xdot;
+  Eigen::Vector<double, 7> xdot;
   xdot(0) = v * std::cos(x(State::kHeading));
   xdot(1) = v * std::sin(x(State::kHeading));
   xdot(2) =
       ((x(State::kRightVelocity) - x(State::kLeftVelocity)) / (2.0 * m_rb))
-          .to<double>();
+          .value();
   xdot.block<4, 1>(3, 0) = A * x.block<4, 1>(3, 0) + B * u;
   return xdot;
 }
diff --git a/wpilibc/src/main/native/cpp/simulation/DigitalPWMSim.cpp b/wpilibc/src/main/native/cpp/simulation/DigitalPWMSim.cpp
index 2ee55ce..eb1e02e 100644
--- a/wpilibc/src/main/native/cpp/simulation/DigitalPWMSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DigitalPWMSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DigitalPWMSim.h"
 
@@ -23,7 +20,9 @@
 
 DigitalPWMSim DigitalPWMSim::CreateForChannel(int channel) {
   int index = HALSIM_FindDigitalPWMForChannel(channel);
-  if (index < 0) throw std::out_of_range("no digital PWM found for channel");
+  if (index < 0) {
+    throw std::out_of_range("no digital PWM found for channel");
+  }
   return DigitalPWMSim{index};
 }
 
@@ -74,8 +73,14 @@
   return store;
 }
 
-int DigitalPWMSim::GetPin() const { return HALSIM_GetDigitalPWMPin(m_index); }
+int DigitalPWMSim::GetPin() const {
+  return HALSIM_GetDigitalPWMPin(m_index);
+}
 
-void DigitalPWMSim::SetPin(int pin) { HALSIM_SetDigitalPWMPin(m_index, pin); }
+void DigitalPWMSim::SetPin(int pin) {
+  HALSIM_SetDigitalPWMPin(m_index, pin);
+}
 
-void DigitalPWMSim::ResetData() { HALSIM_ResetDigitalPWMData(m_index); }
+void DigitalPWMSim::ResetData() {
+  HALSIM_ResetDigitalPWMData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/DriverStationSim.cpp b/wpilibc/src/main/native/cpp/simulation/DriverStationSim.cpp
index 8c0bf70..5f2c645 100644
--- a/wpilibc/src/main/native/cpp/simulation/DriverStationSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DriverStationSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DriverStationSim.h"
 
@@ -27,7 +24,9 @@
   return store;
 }
 
-bool DriverStationSim::GetEnabled() { return HALSIM_GetDriverStationEnabled(); }
+bool DriverStationSim::GetEnabled() {
+  return HALSIM_GetDriverStationEnabled();
+}
 
 void DriverStationSim::SetEnabled(bool enabled) {
   HALSIM_SetDriverStationEnabled(enabled);
@@ -59,9 +58,13 @@
   return store;
 }
 
-bool DriverStationSim::GetTest() { return HALSIM_GetDriverStationTest(); }
+bool DriverStationSim::GetTest() {
+  return HALSIM_GetDriverStationTest();
+}
 
-void DriverStationSim::SetTest(bool test) { HALSIM_SetDriverStationTest(test); }
+void DriverStationSim::SetTest(bool test) {
+  HALSIM_SetDriverStationTest(test);
+}
 
 std::unique_ptr<CallbackStore> DriverStationSim::RegisterEStopCallback(
     NotifyCallback callback, bool initialNotify) {
@@ -72,7 +75,9 @@
   return store;
 }
 
-bool DriverStationSim::GetEStop() { return HALSIM_GetDriverStationEStop(); }
+bool DriverStationSim::GetEStop() {
+  return HALSIM_GetDriverStationEStop();
+}
 
 void DriverStationSim::SetEStop(bool eStop) {
   HALSIM_SetDriverStationEStop(eStop);
@@ -150,7 +155,7 @@
 
 void DriverStationSim::NotifyNewData() {
   HALSIM_NotifyDriverStationNewData();
-  DriverStation::GetInstance().WaitForData();
+  DriverStation::WaitForData();
 }
 
 void DriverStationSim::SetSendError(bool shouldSend) {
@@ -252,4 +257,6 @@
   HALSIM_SetReplayNumber(replayNumber);
 }
 
-void DriverStationSim::ResetData() { HALSIM_ResetDriverStationData(); }
+void DriverStationSim::ResetData() {
+  HALSIM_ResetDriverStationData();
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/DutyCycleEncoderSim.cpp b/wpilibc/src/main/native/cpp/simulation/DutyCycleEncoderSim.cpp
index b12f00a..cb83ccb 100644
--- a/wpilibc/src/main/native/cpp/simulation/DutyCycleEncoderSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DutyCycleEncoderSim.cpp
@@ -1,31 +1,23 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DutyCycleEncoderSim.h"
 
-#include <wpi/SmallString.h>
-#include <wpi/raw_ostream.h>
-
 #include "frc/DutyCycleEncoder.h"
 #include "frc/simulation/SimDeviceSim.h"
 
 using namespace frc::sim;
 
 DutyCycleEncoderSim::DutyCycleEncoderSim(const frc::DutyCycleEncoder& encoder) {
-  wpi::SmallString<128> fullname;
-  wpi::raw_svector_ostream os(fullname);
-  os << "DutyCycleEncoder" << '[' << encoder.GetFPGAIndex() << ']';
-  frc::sim::SimDeviceSim deviceSim{fullname.c_str()};
-  m_simPosition = deviceSim.GetDouble("Position");
-  m_simDistancePerRotation = deviceSim.GetDouble("DistancePerRotation");
+  frc::sim::SimDeviceSim deviceSim{"DutyCycle:DutyCycleEncoder",
+                                   encoder.GetSourceChannel()};
+  m_simPosition = deviceSim.GetDouble("position");
+  m_simDistancePerRotation = deviceSim.GetDouble("distance_per_rot");
 }
 
 void DutyCycleEncoderSim::Set(units::turn_t turns) {
-  m_simPosition.Set(turns.to<double>());
+  m_simPosition.Set(turns.value());
 }
 
 void DutyCycleEncoderSim::SetDistance(double distance) {
diff --git a/wpilibc/src/main/native/cpp/simulation/DutyCycleSim.cpp b/wpilibc/src/main/native/cpp/simulation/DutyCycleSim.cpp
index 7ec19fd..29f2df4 100644
--- a/wpilibc/src/main/native/cpp/simulation/DutyCycleSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/DutyCycleSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/DutyCycleSim.h"
 
@@ -23,7 +20,9 @@
 
 DutyCycleSim DutyCycleSim::CreateForChannel(int channel) {
   int index = HALSIM_FindDutyCycleForChannel(channel);
-  if (index < 0) throw std::out_of_range("no duty cycle found for channel");
+  if (index < 0) {
+    throw std::out_of_range("no duty cycle found for channel");
+  }
   return DutyCycleSim{index};
 }
 
@@ -61,8 +60,8 @@
   return HALSIM_GetDutyCycleFrequency(m_index);
 }
 
-void DutyCycleSim::SetFrequency(int count) {
-  HALSIM_SetDutyCycleFrequency(m_index, count);
+void DutyCycleSim::SetFrequency(int frequency) {
+  HALSIM_SetDutyCycleFrequency(m_index, frequency);
 }
 
 std::unique_ptr<CallbackStore> DutyCycleSim::RegisterOutputCallback(
@@ -78,8 +77,10 @@
   return HALSIM_GetDutyCycleOutput(m_index);
 }
 
-void DutyCycleSim::SetOutput(double period) {
-  HALSIM_SetDutyCycleOutput(m_index, period);
+void DutyCycleSim::SetOutput(double output) {
+  HALSIM_SetDutyCycleOutput(m_index, output);
 }
 
-void DutyCycleSim::ResetData() { HALSIM_ResetDutyCycleData(m_index); }
+void DutyCycleSim::ResetData() {
+  HALSIM_ResetDutyCycleData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/ElevatorSim.cpp b/wpilibc/src/main/native/cpp/simulation/ElevatorSim.cpp
index 89c09cb..a2d5c66 100644
--- a/wpilibc/src/main/native/cpp/simulation/ElevatorSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/ElevatorSim.cpp
@@ -1,16 +1,12 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/ElevatorSim.h"
 
 #include <wpi/MathExtras.h>
 
-#include "frc/StateSpaceUtil.h"
-#include "frc/system/RungeKutta.h"
+#include "frc/system/NumericalIntegration.h"
 #include "frc/system/plant/LinearSystemId.h"
 
 using namespace frc;
@@ -42,16 +38,24 @@
       m_maxHeight(maxHeight),
       m_gearing(gearing) {}
 
-bool ElevatorSim::HasHitLowerLimit(const Eigen::Matrix<double, 2, 1>& x) const {
-  return x(0) < m_minHeight.to<double>();
+bool ElevatorSim::WouldHitLowerLimit(units::meter_t elevatorHeight) const {
+  return elevatorHeight < m_minHeight;
 }
 
-bool ElevatorSim::HasHitUpperLimit(const Eigen::Matrix<double, 2, 1>& x) const {
-  return x(0) > m_maxHeight.to<double>();
+bool ElevatorSim::WouldHitUpperLimit(units::meter_t elevatorHeight) const {
+  return elevatorHeight > m_maxHeight;
+}
+
+bool ElevatorSim::HasHitLowerLimit() const {
+  return WouldHitLowerLimit(units::meter_t(m_y(0)));
+}
+
+bool ElevatorSim::HasHitUpperLimit() const {
+  return WouldHitUpperLimit(units::meter_t(m_y(0)));
 }
 
 units::meter_t ElevatorSim::GetPosition() const {
-  return units::meter_t{m_x(0)};
+  return units::meter_t{m_y(0)};
 }
 
 units::meters_per_second_t ElevatorSim::GetVelocity() const {
@@ -74,25 +78,25 @@
 }
 
 void ElevatorSim::SetInputVoltage(units::volt_t voltage) {
-  SetInput(frc::MakeMatrix<1, 1>(voltage.to<double>()));
+  SetInput(Eigen::Vector<double, 1>{voltage.value()});
 }
 
-Eigen::Matrix<double, 2, 1> ElevatorSim::UpdateX(
-    const Eigen::Matrix<double, 2, 1>& currentXhat,
-    const Eigen::Matrix<double, 1, 1>& u, units::second_t dt) {
-  auto updatedXhat = RungeKutta(
-      [&](const Eigen::Matrix<double, 2, 1>& x,
-          const Eigen::Matrix<double, 1, 1>& u_)
-          -> Eigen::Matrix<double, 2, 1> {
-        return m_plant.A() * x + m_plant.B() * u_ + MakeMatrix<2, 1>(0.0, -9.8);
+Eigen::Vector<double, 2> ElevatorSim::UpdateX(
+    const Eigen::Vector<double, 2>& currentXhat,
+    const Eigen::Vector<double, 1>& u, units::second_t dt) {
+  auto updatedXhat = RKDP(
+      [&](const Eigen::Vector<double, 2>& x,
+          const Eigen::Vector<double, 1>& u_) -> Eigen::Vector<double, 2> {
+        return m_plant.A() * x + m_plant.B() * u_ +
+               Eigen::Vector<double, 2>{0.0, -9.8};
       },
       currentXhat, u, dt);
   // Check for collision after updating x-hat.
-  if (HasHitLowerLimit(updatedXhat)) {
-    return MakeMatrix<2, 1>(m_minHeight.to<double>(), 0.0);
+  if (WouldHitLowerLimit(units::meter_t(updatedXhat(0)))) {
+    return Eigen::Vector<double, 2>{m_minHeight.value(), 0.0};
   }
-  if (HasHitUpperLimit(updatedXhat)) {
-    return MakeMatrix<2, 1>(m_maxHeight.to<double>(), 0.0);
+  if (WouldHitUpperLimit(units::meter_t(updatedXhat(0)))) {
+    return Eigen::Vector<double, 2>{m_maxHeight.value(), 0.0};
   }
   return updatedXhat;
 }
diff --git a/wpilibc/src/main/native/cpp/simulation/EncoderSim.cpp b/wpilibc/src/main/native/cpp/simulation/EncoderSim.cpp
index 5bc5d52..146328d 100644
--- a/wpilibc/src/main/native/cpp/simulation/EncoderSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/EncoderSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/EncoderSim.h"
 
@@ -23,11 +20,15 @@
 
 EncoderSim EncoderSim::CreateForChannel(int channel) {
   int index = HALSIM_FindEncoderForChannel(channel);
-  if (index < 0) throw std::out_of_range("no encoder found for channel");
+  if (index < 0) {
+    throw std::out_of_range("no encoder found for channel");
+  }
   return EncoderSim{index};
 }
 
-EncoderSim EncoderSim::CreateForIndex(int index) { return EncoderSim{index}; }
+EncoderSim EncoderSim::CreateForIndex(int index) {
+  return EncoderSim{index};
+}
 
 std::unique_ptr<CallbackStore> EncoderSim::RegisterInitializedCallback(
     NotifyCallback callback, bool initialNotify) {
@@ -55,9 +56,13 @@
   return store;
 }
 
-int EncoderSim::GetCount() const { return HALSIM_GetEncoderCount(m_index); }
+int EncoderSim::GetCount() const {
+  return HALSIM_GetEncoderCount(m_index);
+}
 
-void EncoderSim::SetCount(int count) { HALSIM_SetEncoderCount(m_index, count); }
+void EncoderSim::SetCount(int count) {
+  HALSIM_SetEncoderCount(m_index, count);
+}
 
 std::unique_ptr<CallbackStore> EncoderSim::RegisterPeriodCallback(
     NotifyCallback callback, bool initialNotify) {
@@ -85,7 +90,9 @@
   return store;
 }
 
-bool EncoderSim::GetReset() const { return HALSIM_GetEncoderReset(m_index); }
+bool EncoderSim::GetReset() const {
+  return HALSIM_GetEncoderReset(m_index);
+}
 
 void EncoderSim::SetReset(bool reset) {
   HALSIM_SetEncoderReset(m_index, reset);
@@ -176,14 +183,22 @@
   HALSIM_SetEncoderDistancePerPulse(m_index, distancePerPulse);
 }
 
-void EncoderSim::ResetData() { HALSIM_ResetEncoderData(m_index); }
+void EncoderSim::ResetData() {
+  HALSIM_ResetEncoderData(m_index);
+}
 
 void EncoderSim::SetDistance(double distance) {
   HALSIM_SetEncoderDistance(m_index, distance);
 }
 
-double EncoderSim::GetDistance() { return HALSIM_GetEncoderDistance(m_index); }
+double EncoderSim::GetDistance() {
+  return HALSIM_GetEncoderDistance(m_index);
+}
 
-void EncoderSim::SetRate(double rate) { HALSIM_SetEncoderRate(m_index, rate); }
+void EncoderSim::SetRate(double rate) {
+  HALSIM_SetEncoderRate(m_index, rate);
+}
 
-double EncoderSim::GetRate() { return HALSIM_GetEncoderRate(m_index); }
+double EncoderSim::GetRate() {
+  return HALSIM_GetEncoderRate(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/Field2d.cpp b/wpilibc/src/main/native/cpp/simulation/Field2d.cpp
deleted file mode 100644
index a6098b6..0000000
--- a/wpilibc/src/main/native/cpp/simulation/Field2d.cpp
+++ /dev/null
@@ -1,49 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/simulation/Field2d.h"
-
-using namespace frc;
-
-Field2d::Field2d() : m_device{"Field2D"} {
-  if (m_device) {
-    m_x = m_device.CreateDouble("x", false, 0.0);
-    m_y = m_device.CreateDouble("y", false, 0.0);
-    m_rot = m_device.CreateDouble("rot", false, 0.0);
-  }
-}
-
-void Field2d::SetRobotPose(const Pose2d& pose) {
-  if (m_device) {
-    auto& translation = pose.Translation();
-    m_x.Set(translation.X().to<double>());
-    m_y.Set(translation.Y().to<double>());
-    m_rot.Set(pose.Rotation().Degrees().to<double>());
-  } else {
-    m_pose = pose;
-  }
-}
-
-void Field2d::SetRobotPose(units::meter_t x, units::meter_t y,
-                           Rotation2d rotation) {
-  if (m_device) {
-    m_x.Set(x.to<double>());
-    m_y.Set(y.to<double>());
-    m_rot.Set(rotation.Degrees().to<double>());
-  } else {
-    m_pose = Pose2d{x, y, rotation};
-  }
-}
-
-Pose2d Field2d::GetRobotPose() {
-  if (m_device) {
-    return Pose2d{units::meter_t{m_x.Get()}, units::meter_t{m_y.Get()},
-                  Rotation2d{units::degree_t{m_rot.Get()}}};
-  } else {
-    return m_pose;
-  }
-}
diff --git a/wpilibc/src/main/native/cpp/simulation/FlywheelSim.cpp b/wpilibc/src/main/native/cpp/simulation/FlywheelSim.cpp
index 65fc3c8..f4371b1 100644
--- a/wpilibc/src/main/native/cpp/simulation/FlywheelSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/FlywheelSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/FlywheelSim.h"
 
@@ -41,5 +38,5 @@
 }
 
 void FlywheelSim::SetInputVoltage(units::volt_t voltage) {
-  SetInput(frc::MakeMatrix<1, 1>(voltage.to<double>()));
+  SetInput(Eigen::Vector<double, 1>{voltage.value()});
 }
diff --git a/wpilibc/src/main/native/cpp/simulation/GenericHIDSim.cpp b/wpilibc/src/main/native/cpp/simulation/GenericHIDSim.cpp
index 8df265a..f4981e9 100644
--- a/wpilibc/src/main/native/cpp/simulation/GenericHIDSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/GenericHIDSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/GenericHIDSim.h"
 
@@ -18,7 +15,9 @@
 
 GenericHIDSim::GenericHIDSim(int port) : m_port{port} {}
 
-void GenericHIDSim::NotifyNewData() { DriverStationSim::NotifyNewData(); }
+void GenericHIDSim::NotifyNewData() {
+  DriverStationSim::NotifyNewData();
+}
 
 void GenericHIDSim::SetRawButton(int button, bool value) {
   DriverStationSim::SetJoystickButton(m_port, button, value);
@@ -32,7 +31,9 @@
   DriverStationSim::SetJoystickPOV(m_port, pov, value);
 }
 
-void GenericHIDSim::SetPOV(int value) { SetPOV(0, value); }
+void GenericHIDSim::SetPOV(int value) {
+  SetPOV(0, value);
+}
 
 void GenericHIDSim::SetAxisCount(int count) {
   DriverStationSim::SetJoystickAxisCount(m_port, count);
diff --git a/wpilibc/src/main/native/cpp/simulation/JoystickSim.cpp b/wpilibc/src/main/native/cpp/simulation/JoystickSim.cpp
index 55f6089..d103822 100644
--- a/wpilibc/src/main/native/cpp/simulation/JoystickSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/JoystickSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/JoystickSim.h"
 
@@ -58,6 +55,10 @@
              value);
 }
 
-void JoystickSim::SetTrigger(bool state) { SetRawButton(1, state); }
+void JoystickSim::SetTrigger(bool state) {
+  SetRawButton(1, state);
+}
 
-void JoystickSim::SetTop(bool state) { SetRawButton(2, state); }
+void JoystickSim::SetTop(bool state) {
+  SetRawButton(2, state);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/Mechanism2D.cpp b/wpilibc/src/main/native/cpp/simulation/Mechanism2D.cpp
deleted file mode 100644
index 43178b1..0000000
--- a/wpilibc/src/main/native/cpp/simulation/Mechanism2D.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/simulation/Mechanism2D.h"
-
-#include <wpi/SmallString.h>
-#include <wpi/Twine.h>
-#include <wpi/raw_ostream.h>
-
-using namespace frc;
-
-Mechanism2D::Mechanism2D() : m_device{"Mechanism2D"} {}
-
-void Mechanism2D::SetLigamentAngle(const wpi::Twine& ligamentPath,
-                                   float angle) {
-  if (m_device) {
-    wpi::SmallString<64> fullPathBuf;
-    wpi::StringRef fullPath =
-        (ligamentPath + "/angle").toNullTerminatedStringRef(fullPathBuf);
-    if (!createdItems.count(fullPath)) {
-      createdItems[fullPath] =
-          m_device.CreateDouble(fullPath.data(), false, angle);
-    }
-    createdItems[fullPath].Set(angle);
-  }
-}
-
-void Mechanism2D::SetLigamentLength(const wpi::Twine& ligamentPath,
-                                    float length) {
-  if (m_device) {
-    wpi::SmallString<64> fullPathBuf;
-    wpi::StringRef fullPath =
-        (ligamentPath + "/length").toNullTerminatedStringRef(fullPathBuf);
-    if (!createdItems.count(fullPath)) {
-      createdItems[fullPath] =
-          m_device.CreateDouble(fullPath.data(), false, length);
-    }
-    createdItems[fullPath].Set(length);
-  }
-}
diff --git a/wpilibc/src/main/native/cpp/simulation/PCMSim.cpp b/wpilibc/src/main/native/cpp/simulation/PCMSim.cpp
deleted file mode 100644
index 5d0566a..0000000
--- a/wpilibc/src/main/native/cpp/simulation/PCMSim.cpp
+++ /dev/null
@@ -1,158 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/simulation/PCMSim.h"
-
-#include <memory>
-#include <utility>
-
-#include <hal/simulation/PCMData.h>
-
-#include "frc/Compressor.h"
-#include "frc/SensorUtil.h"
-
-using namespace frc;
-using namespace frc::sim;
-
-PCMSim::PCMSim() : m_index{SensorUtil::GetDefaultSolenoidModule()} {}
-
-PCMSim::PCMSim(int module) : m_index{module} {}
-
-PCMSim::PCMSim(const Compressor& compressor)
-    : m_index{compressor.GetModule()} {}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterSolenoidInitializedCallback(
-    int channel, NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, channel, -1, callback,
-      &HALSIM_CancelPCMSolenoidInitializedCallback);
-  store->SetUid(HALSIM_RegisterPCMSolenoidInitializedCallback(
-      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetSolenoidInitialized(int channel) const {
-  return HALSIM_GetPCMSolenoidInitialized(m_index, channel);
-}
-
-void PCMSim::SetSolenoidInitialized(int channel, bool solenoidInitialized) {
-  HALSIM_SetPCMSolenoidInitialized(m_index, channel, solenoidInitialized);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterSolenoidOutputCallback(
-    int channel, NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, channel, -1, callback, &HALSIM_CancelPCMSolenoidOutputCallback);
-  store->SetUid(HALSIM_RegisterPCMSolenoidOutputCallback(
-      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetSolenoidOutput(int channel) const {
-  return HALSIM_GetPCMSolenoidOutput(m_index, channel);
-}
-
-void PCMSim::SetSolenoidOutput(int channel, bool solenoidOutput) {
-  HALSIM_SetPCMSolenoidOutput(m_index, channel, solenoidOutput);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterCompressorInitializedCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPCMCompressorInitializedCallback);
-  store->SetUid(HALSIM_RegisterPCMCompressorInitializedCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetCompressorInitialized() const {
-  return HALSIM_GetPCMCompressorInitialized(m_index);
-}
-
-void PCMSim::SetCompressorInitialized(bool compressorInitialized) {
-  HALSIM_SetPCMCompressorInitialized(m_index, compressorInitialized);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterCompressorOnCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPCMCompressorOnCallback);
-  store->SetUid(HALSIM_RegisterPCMCompressorOnCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetCompressorOn() const {
-  return HALSIM_GetPCMCompressorOn(m_index);
-}
-
-void PCMSim::SetCompressorOn(bool compressorOn) {
-  HALSIM_SetPCMCompressorOn(m_index, compressorOn);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterClosedLoopEnabledCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPCMClosedLoopEnabledCallback);
-  store->SetUid(HALSIM_RegisterPCMClosedLoopEnabledCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetClosedLoopEnabled() const {
-  return HALSIM_GetPCMClosedLoopEnabled(m_index);
-}
-
-void PCMSim::SetClosedLoopEnabled(bool closedLoopEnabled) {
-  HALSIM_SetPCMClosedLoopEnabled(m_index, closedLoopEnabled);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterPressureSwitchCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPCMPressureSwitchCallback);
-  store->SetUid(HALSIM_RegisterPCMPressureSwitchCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PCMSim::GetPressureSwitch() const {
-  return HALSIM_GetPCMPressureSwitch(m_index);
-}
-
-void PCMSim::SetPressureSwitch(bool pressureSwitch) {
-  HALSIM_SetPCMPressureSwitch(m_index, pressureSwitch);
-}
-
-std::unique_ptr<CallbackStore> PCMSim::RegisterCompressorCurrentCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPCMCompressorCurrentCallback);
-  store->SetUid(HALSIM_RegisterPCMCompressorCurrentCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-double PCMSim::GetCompressorCurrent() const {
-  return HALSIM_GetPCMCompressorCurrent(m_index);
-}
-
-void PCMSim::SetCompressorCurrent(double compressorCurrent) {
-  HALSIM_SetPCMCompressorCurrent(m_index, compressorCurrent);
-}
-
-uint8_t PCMSim::GetAllSolenoidOutputs() const {
-  uint8_t ret = 0;
-  HALSIM_GetPCMAllSolenoids(m_index, &ret);
-  return ret;
-}
-
-void PCMSim::SetAllSolenoidOutputs(uint8_t outputs) {
-  HALSIM_SetPCMAllSolenoids(m_index, outputs);
-}
-
-void PCMSim::ResetData() { HALSIM_ResetPCMData(m_index); }
diff --git a/wpilibc/src/main/native/cpp/simulation/PDPSim.cpp b/wpilibc/src/main/native/cpp/simulation/PDPSim.cpp
deleted file mode 100644
index 26d6a45..0000000
--- a/wpilibc/src/main/native/cpp/simulation/PDPSim.cpp
+++ /dev/null
@@ -1,98 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/simulation/PDPSim.h"
-
-#include <memory>
-#include <utility>
-
-#include <hal/simulation/PDPData.h>
-
-#include "frc/PowerDistributionPanel.h"
-
-using namespace frc;
-using namespace frc::sim;
-
-PDPSim::PDPSim(int module) : m_index{module} {}
-
-PDPSim::PDPSim(const PowerDistributionPanel& pdp) : m_index{pdp.GetModule()} {}
-
-std::unique_ptr<CallbackStore> PDPSim::RegisterInitializedCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPDPInitializedCallback);
-  store->SetUid(HALSIM_RegisterPDPInitializedCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-bool PDPSim::GetInitialized() const {
-  return HALSIM_GetPDPInitialized(m_index);
-}
-
-void PDPSim::SetInitialized(bool initialized) {
-  HALSIM_SetPDPInitialized(m_index, initialized);
-}
-
-std::unique_ptr<CallbackStore> PDPSim::RegisterTemperatureCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPDPTemperatureCallback);
-  store->SetUid(HALSIM_RegisterPDPTemperatureCallback(
-      m_index, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-double PDPSim::GetTemperature() const {
-  return HALSIM_GetPDPTemperature(m_index);
-}
-
-void PDPSim::SetTemperature(double temperature) {
-  HALSIM_SetPDPTemperature(m_index, temperature);
-}
-
-std::unique_ptr<CallbackStore> PDPSim::RegisterVoltageCallback(
-    NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, -1, callback, &HALSIM_CancelPDPVoltageCallback);
-  store->SetUid(HALSIM_RegisterPDPVoltageCallback(m_index, &CallbackStoreThunk,
-                                                  store.get(), initialNotify));
-  return store;
-}
-
-double PDPSim::GetVoltage() const { return HALSIM_GetPDPVoltage(m_index); }
-
-void PDPSim::SetVoltage(double voltage) {
-  HALSIM_SetPDPVoltage(m_index, voltage);
-}
-
-std::unique_ptr<CallbackStore> PDPSim::RegisterCurrentCallback(
-    int channel, NotifyCallback callback, bool initialNotify) {
-  auto store = std::make_unique<CallbackStore>(
-      m_index, channel, -1, callback, &HALSIM_CancelPDPCurrentCallback);
-  store->SetUid(HALSIM_RegisterPDPCurrentCallback(
-      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
-  return store;
-}
-
-double PDPSim::GetCurrent(int channel) const {
-  return HALSIM_GetPDPCurrent(m_index, channel);
-}
-
-void PDPSim::SetCurrent(int channel, double current) {
-  HALSIM_SetPDPCurrent(m_index, channel, current);
-}
-
-void PDPSim::GetAllCurrents(double* currents) const {
-  HALSIM_GetPDPAllCurrents(m_index, currents);
-}
-
-void PDPSim::SetAllCurrents(const double* currents) {
-  HALSIM_SetPDPAllCurrents(m_index, currents);
-}
-
-void PDPSim::ResetData() { HALSIM_ResetPDPData(m_index); }
diff --git a/wpilibc/src/main/native/cpp/simulation/PS4ControllerSim.cpp b/wpilibc/src/main/native/cpp/simulation/PS4ControllerSim.cpp
new file mode 100644
index 0000000..3403755
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/PS4ControllerSim.cpp
@@ -0,0 +1,101 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/PS4ControllerSim.h"
+
+#include "frc/PS4Controller.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+PS4ControllerSim::PS4ControllerSim(const PS4Controller& joystick)
+    : GenericHIDSim{joystick} {
+  SetAxisCount(6);
+  SetButtonCount(14);
+}
+
+PS4ControllerSim::PS4ControllerSim(int port) : GenericHIDSim{port} {
+  SetAxisCount(6);
+  SetButtonCount(14);
+}
+
+void PS4ControllerSim::SetLeftX(double value) {
+  SetRawAxis(PS4Controller::Axis::kLeftX, value);
+}
+
+void PS4ControllerSim::SetRightX(double value) {
+  SetRawAxis(PS4Controller::Axis::kRightX, value);
+}
+
+void PS4ControllerSim::SetLeftY(double value) {
+  SetRawAxis(PS4Controller::Axis::kLeftY, value);
+}
+
+void PS4ControllerSim::SetRightY(double value) {
+  SetRawAxis(PS4Controller::Axis::kRightY, value);
+}
+
+void PS4ControllerSim::SetL2Axis(double value) {
+  SetRawAxis(PS4Controller::Axis::kL2, value);
+}
+
+void PS4ControllerSim::SetR2Axis(double value) {
+  SetRawAxis(PS4Controller::Axis::kR2, value);
+}
+
+void PS4ControllerSim::SetSquareButton(bool value) {
+  SetRawButton(PS4Controller::Button::kSquare, value);
+}
+
+void PS4ControllerSim::SetCrossButton(bool value) {
+  SetRawButton(PS4Controller::Button::kCross, value);
+}
+
+void PS4ControllerSim::SetCircleButton(bool value) {
+  SetRawButton(PS4Controller::Button::kCircle, value);
+}
+
+void PS4ControllerSim::SetTriangleButton(bool value) {
+  SetRawButton(PS4Controller::Button::kTriangle, value);
+}
+
+void PS4ControllerSim::SetL1Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL1, value);
+}
+
+void PS4ControllerSim::SetR1Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR1, value);
+}
+
+void PS4ControllerSim::SetL2Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL2, value);
+}
+
+void PS4ControllerSim::SetR2Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR2, value);
+}
+
+void PS4ControllerSim::SetShareButton(bool value) {
+  SetRawButton(PS4Controller::Button::kShare, value);
+}
+
+void PS4ControllerSim::SetOptionsButton(bool value) {
+  SetRawButton(PS4Controller::Button::kOptions, value);
+}
+
+void PS4ControllerSim::SetL3Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL3, value);
+}
+
+void PS4ControllerSim::SetR3Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR3, value);
+}
+
+void PS4ControllerSim::SetPSButton(bool value) {
+  SetRawButton(PS4Controller::Button::kPS, value);
+}
+
+void PS4ControllerSim::SetTouchpad(bool value) {
+  SetRawButton(PS4Controller::Button::kTouchpad, value);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/PWMSim.cpp b/wpilibc/src/main/native/cpp/simulation/PWMSim.cpp
index 2fae8fb..f5d69db 100644
--- a/wpilibc/src/main/native/cpp/simulation/PWMSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/PWMSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/PWMSim.h"
 
@@ -47,7 +44,9 @@
   return store;
 }
 
-int PWMSim::GetRawValue() const { return HALSIM_GetPWMRawValue(m_index); }
+int PWMSim::GetRawValue() const {
+  return HALSIM_GetPWMRawValue(m_index);
+}
 
 void PWMSim::SetRawValue(int rawValue) {
   HALSIM_SetPWMRawValue(m_index, rawValue);
@@ -62,9 +61,13 @@
   return store;
 }
 
-double PWMSim::GetSpeed() const { return HALSIM_GetPWMSpeed(m_index); }
+double PWMSim::GetSpeed() const {
+  return HALSIM_GetPWMSpeed(m_index);
+}
 
-void PWMSim::SetSpeed(double speed) { HALSIM_SetPWMSpeed(m_index, speed); }
+void PWMSim::SetSpeed(double speed) {
+  HALSIM_SetPWMSpeed(m_index, speed);
+}
 
 std::unique_ptr<CallbackStore> PWMSim::RegisterPositionCallback(
     NotifyCallback callback, bool initialNotify) {
@@ -75,7 +78,9 @@
   return store;
 }
 
-double PWMSim::GetPosition() const { return HALSIM_GetPWMPosition(m_index); }
+double PWMSim::GetPosition() const {
+  return HALSIM_GetPWMPosition(m_index);
+}
 
 void PWMSim::SetPosition(double position) {
   HALSIM_SetPWMPosition(m_index, position);
@@ -90,7 +95,9 @@
   return store;
 }
 
-int PWMSim::GetPeriodScale() const { return HALSIM_GetPWMPeriodScale(m_index); }
+int PWMSim::GetPeriodScale() const {
+  return HALSIM_GetPWMPeriodScale(m_index);
+}
 
 void PWMSim::SetPeriodScale(int periodScale) {
   HALSIM_SetPWMPeriodScale(m_index, periodScale);
@@ -105,10 +112,14 @@
   return store;
 }
 
-bool PWMSim::GetZeroLatch() const { return HALSIM_GetPWMZeroLatch(m_index); }
+bool PWMSim::GetZeroLatch() const {
+  return HALSIM_GetPWMZeroLatch(m_index);
+}
 
 void PWMSim::SetZeroLatch(bool zeroLatch) {
   HALSIM_SetPWMZeroLatch(m_index, zeroLatch);
 }
 
-void PWMSim::ResetData() { HALSIM_ResetPWMData(m_index); }
+void PWMSim::ResetData() {
+  HALSIM_ResetPWMData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/PowerDistributionSim.cpp b/wpilibc/src/main/native/cpp/simulation/PowerDistributionSim.cpp
new file mode 100644
index 0000000..844a1b6
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/PowerDistributionSim.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/PowerDistributionSim.h"
+
+#include <memory>
+#include <utility>
+
+#include <hal/simulation/PowerDistributionData.h>
+
+#include "frc/PowerDistribution.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+PowerDistributionSim::PowerDistributionSim(int module) : m_index{module} {}
+
+PowerDistributionSim::PowerDistributionSim(const PowerDistribution& pdp)
+    : m_index{pdp.GetModule()} {}
+
+std::unique_ptr<CallbackStore>
+PowerDistributionSim::RegisterInitializedCallback(NotifyCallback callback,
+                                                  bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback,
+      &HALSIM_CancelPowerDistributionInitializedCallback);
+  store->SetUid(HALSIM_RegisterPowerDistributionInitializedCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool PowerDistributionSim::GetInitialized() const {
+  return HALSIM_GetPowerDistributionInitialized(m_index);
+}
+
+void PowerDistributionSim::SetInitialized(bool initialized) {
+  HALSIM_SetPowerDistributionInitialized(m_index, initialized);
+}
+
+std::unique_ptr<CallbackStore>
+PowerDistributionSim::RegisterTemperatureCallback(NotifyCallback callback,
+                                                  bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback,
+      &HALSIM_CancelPowerDistributionTemperatureCallback);
+  store->SetUid(HALSIM_RegisterPowerDistributionTemperatureCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double PowerDistributionSim::GetTemperature() const {
+  return HALSIM_GetPowerDistributionTemperature(m_index);
+}
+
+void PowerDistributionSim::SetTemperature(double temperature) {
+  HALSIM_SetPowerDistributionTemperature(m_index, temperature);
+}
+
+std::unique_ptr<CallbackStore> PowerDistributionSim::RegisterVoltageCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelPowerDistributionVoltageCallback);
+  store->SetUid(HALSIM_RegisterPowerDistributionVoltageCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double PowerDistributionSim::GetVoltage() const {
+  return HALSIM_GetPowerDistributionVoltage(m_index);
+}
+
+void PowerDistributionSim::SetVoltage(double voltage) {
+  HALSIM_SetPowerDistributionVoltage(m_index, voltage);
+}
+
+std::unique_ptr<CallbackStore> PowerDistributionSim::RegisterCurrentCallback(
+    int channel, NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, channel, -1, callback,
+      &HALSIM_CancelPowerDistributionCurrentCallback);
+  store->SetUid(HALSIM_RegisterPowerDistributionCurrentCallback(
+      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double PowerDistributionSim::GetCurrent(int channel) const {
+  return HALSIM_GetPowerDistributionCurrent(m_index, channel);
+}
+
+void PowerDistributionSim::SetCurrent(int channel, double current) {
+  HALSIM_SetPowerDistributionCurrent(m_index, channel, current);
+}
+
+void PowerDistributionSim::GetAllCurrents(double* currents, int length) const {
+  HALSIM_GetPowerDistributionAllCurrents(m_index, currents, length);
+}
+
+void PowerDistributionSim::SetAllCurrents(const double* currents, int length) {
+  HALSIM_SetPowerDistributionAllCurrents(m_index, currents, length);
+}
+
+void PowerDistributionSim::ResetData() {
+  HALSIM_ResetPowerDistributionData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/REVPHSim.cpp b/wpilibc/src/main/native/cpp/simulation/REVPHSim.cpp
new file mode 100644
index 0000000..dd6dba8
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/REVPHSim.cpp
@@ -0,0 +1,139 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/REVPHSim.h"
+
+#include <memory>
+#include <utility>
+
+#include <hal/simulation/REVPHData.h>
+
+#include "frc/SensorUtil.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+REVPHSim::REVPHSim() : m_index{SensorUtil::GetDefaultREVPHModule()} {}
+
+REVPHSim::REVPHSim(int module) : m_index{module} {}
+
+REVPHSim::REVPHSim(const PneumaticsBase& pneumatics)
+    : m_index{pneumatics.GetModuleNumber()} {}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterInitializedCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelREVPHInitializedCallback);
+  store->SetUid(HALSIM_RegisterREVPHInitializedCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool REVPHSim::GetInitialized() const {
+  return HALSIM_GetREVPHInitialized(m_index);
+}
+
+void REVPHSim::SetInitialized(bool solenoidInitialized) {
+  HALSIM_SetREVPHInitialized(m_index, solenoidInitialized);
+}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterSolenoidOutputCallback(
+    int channel, NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, channel, -1, callback,
+      &HALSIM_CancelREVPHSolenoidOutputCallback);
+  store->SetUid(HALSIM_RegisterREVPHSolenoidOutputCallback(
+      m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool REVPHSim::GetSolenoidOutput(int channel) const {
+  return HALSIM_GetREVPHSolenoidOutput(m_index, channel);
+}
+
+void REVPHSim::SetSolenoidOutput(int channel, bool solenoidOutput) {
+  HALSIM_SetREVPHSolenoidOutput(m_index, channel, solenoidOutput);
+}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterCompressorOnCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelREVPHCompressorOnCallback);
+  store->SetUid(HALSIM_RegisterREVPHCompressorOnCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool REVPHSim::GetCompressorOn() const {
+  return HALSIM_GetREVPHCompressorOn(m_index);
+}
+
+void REVPHSim::SetCompressorOn(bool compressorOn) {
+  HALSIM_SetREVPHCompressorOn(m_index, compressorOn);
+}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterClosedLoopEnabledCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelREVPHClosedLoopEnabledCallback);
+  store->SetUid(HALSIM_RegisterREVPHClosedLoopEnabledCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool REVPHSim::GetClosedLoopEnabled() const {
+  return HALSIM_GetREVPHClosedLoopEnabled(m_index);
+}
+
+void REVPHSim::SetClosedLoopEnabled(bool closedLoopEnabled) {
+  HALSIM_SetREVPHClosedLoopEnabled(m_index, closedLoopEnabled);
+}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterPressureSwitchCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelREVPHPressureSwitchCallback);
+  store->SetUid(HALSIM_RegisterREVPHPressureSwitchCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool REVPHSim::GetPressureSwitch() const {
+  return HALSIM_GetREVPHPressureSwitch(m_index);
+}
+
+void REVPHSim::SetPressureSwitch(bool pressureSwitch) {
+  HALSIM_SetREVPHPressureSwitch(m_index, pressureSwitch);
+}
+
+std::unique_ptr<CallbackStore> REVPHSim::RegisterCompressorCurrentCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelREVPHCompressorCurrentCallback);
+  store->SetUid(HALSIM_RegisterREVPHCompressorCurrentCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double REVPHSim::GetCompressorCurrent() const {
+  return HALSIM_GetREVPHCompressorCurrent(m_index);
+}
+
+void REVPHSim::SetCompressorCurrent(double compressorCurrent) {
+  HALSIM_SetREVPHCompressorCurrent(m_index, compressorCurrent);
+}
+
+uint8_t REVPHSim::GetAllSolenoidOutputs() const {
+  uint8_t ret = 0;
+  HALSIM_GetREVPHAllSolenoids(m_index, &ret);
+  return ret;
+}
+
+void REVPHSim::SetAllSolenoidOutputs(uint8_t outputs) {
+  HALSIM_SetREVPHAllSolenoids(m_index, outputs);
+}
+
+void REVPHSim::ResetData() {
+  HALSIM_ResetREVPHData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/RelaySim.cpp b/wpilibc/src/main/native/cpp/simulation/RelaySim.cpp
index 7f7aa65..84ce120 100644
--- a/wpilibc/src/main/native/cpp/simulation/RelaySim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/RelaySim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/RelaySim.h"
 
@@ -64,7 +61,9 @@
   return store;
 }
 
-bool RelaySim::GetForward() const { return HALSIM_GetRelayForward(m_index); }
+bool RelaySim::GetForward() const {
+  return HALSIM_GetRelayForward(m_index);
+}
 
 void RelaySim::SetForward(bool forward) {
   HALSIM_SetRelayForward(m_index, forward);
@@ -79,10 +78,14 @@
   return store;
 }
 
-bool RelaySim::GetReverse() const { return HALSIM_GetRelayReverse(m_index); }
+bool RelaySim::GetReverse() const {
+  return HALSIM_GetRelayReverse(m_index);
+}
 
 void RelaySim::SetReverse(bool reverse) {
   HALSIM_SetRelayReverse(m_index, reverse);
 }
 
-void RelaySim::ResetData() { HALSIM_ResetRelayData(m_index); }
+void RelaySim::ResetData() {
+  HALSIM_ResetRelayData(m_index);
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/RoboRioSim.cpp b/wpilibc/src/main/native/cpp/simulation/RoboRioSim.cpp
index 0d1d104..dc2b557 100644
--- a/wpilibc/src/main/native/cpp/simulation/RoboRioSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/RoboRioSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/RoboRioSim.h"
 
@@ -24,7 +21,9 @@
   return store;
 }
 
-bool RoboRioSim::GetFPGAButton() { return HALSIM_GetRoboRioFPGAButton(); }
+bool RoboRioSim::GetFPGAButton() {
+  return HALSIM_GetRoboRioFPGAButton();
+}
 
 void RoboRioSim::SetFPGAButton(bool fPGAButton) {
   HALSIM_SetRoboRioFPGAButton(fPGAButton);
@@ -44,7 +43,7 @@
 }
 
 void RoboRioSim::SetVInVoltage(units::volt_t vInVoltage) {
-  HALSIM_SetRoboRioVInVoltage(vInVoltage.to<double>());
+  HALSIM_SetRoboRioVInVoltage(vInVoltage.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterVInCurrentCallback(
@@ -61,7 +60,7 @@
 }
 
 void RoboRioSim::SetVInCurrent(units::ampere_t vInCurrent) {
-  HALSIM_SetRoboRioVInCurrent(vInCurrent.to<double>());
+  HALSIM_SetRoboRioVInCurrent(vInCurrent.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserVoltage6VCallback(
@@ -78,7 +77,7 @@
 }
 
 void RoboRioSim::SetUserVoltage6V(units::volt_t userVoltage6V) {
-  HALSIM_SetRoboRioUserVoltage6V(userVoltage6V.to<double>());
+  HALSIM_SetRoboRioUserVoltage6V(userVoltage6V.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserCurrent6VCallback(
@@ -95,7 +94,7 @@
 }
 
 void RoboRioSim::SetUserCurrent6V(units::ampere_t userCurrent6V) {
-  HALSIM_SetRoboRioUserCurrent6V(userCurrent6V.to<double>());
+  HALSIM_SetRoboRioUserCurrent6V(userCurrent6V.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserActive6VCallback(
@@ -107,7 +106,9 @@
   return store;
 }
 
-bool RoboRioSim::GetUserActive6V() { return HALSIM_GetRoboRioUserActive6V(); }
+bool RoboRioSim::GetUserActive6V() {
+  return HALSIM_GetRoboRioUserActive6V();
+}
 
 void RoboRioSim::SetUserActive6V(bool userActive6V) {
   HALSIM_SetRoboRioUserActive6V(userActive6V);
@@ -127,7 +128,7 @@
 }
 
 void RoboRioSim::SetUserVoltage5V(units::volt_t userVoltage5V) {
-  HALSIM_SetRoboRioUserVoltage5V(userVoltage5V.to<double>());
+  HALSIM_SetRoboRioUserVoltage5V(userVoltage5V.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserCurrent5VCallback(
@@ -144,7 +145,7 @@
 }
 
 void RoboRioSim::SetUserCurrent5V(units::ampere_t userCurrent5V) {
-  HALSIM_SetRoboRioUserCurrent5V(userCurrent5V.to<double>());
+  HALSIM_SetRoboRioUserCurrent5V(userCurrent5V.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserActive5VCallback(
@@ -156,7 +157,9 @@
   return store;
 }
 
-bool RoboRioSim::GetUserActive5V() { return HALSIM_GetRoboRioUserActive5V(); }
+bool RoboRioSim::GetUserActive5V() {
+  return HALSIM_GetRoboRioUserActive5V();
+}
 
 void RoboRioSim::SetUserActive5V(bool userActive5V) {
   HALSIM_SetRoboRioUserActive5V(userActive5V);
@@ -176,7 +179,7 @@
 }
 
 void RoboRioSim::SetUserVoltage3V3(units::volt_t userVoltage3V3) {
-  HALSIM_SetRoboRioUserVoltage3V3(userVoltage3V3.to<double>());
+  HALSIM_SetRoboRioUserVoltage3V3(userVoltage3V3.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserCurrent3V3Callback(
@@ -193,7 +196,7 @@
 }
 
 void RoboRioSim::SetUserCurrent3V3(units::ampere_t userCurrent3V3) {
-  HALSIM_SetRoboRioUserCurrent3V3(userCurrent3V3.to<double>());
+  HALSIM_SetRoboRioUserCurrent3V3(userCurrent3V3.value());
 }
 
 std::unique_ptr<CallbackStore> RoboRioSim::RegisterUserActive3V3Callback(
@@ -205,7 +208,9 @@
   return store;
 }
 
-bool RoboRioSim::GetUserActive3V3() { return HALSIM_GetRoboRioUserActive3V3(); }
+bool RoboRioSim::GetUserActive3V3() {
+  return HALSIM_GetRoboRioUserActive3V3();
+}
 
 void RoboRioSim::SetUserActive3V3(bool userActive3V3) {
   HALSIM_SetRoboRioUserActive3V3(userActive3V3);
@@ -220,7 +225,9 @@
   return store;
 }
 
-int RoboRioSim::GetUserFaults6V() { return HALSIM_GetRoboRioUserFaults6V(); }
+int RoboRioSim::GetUserFaults6V() {
+  return HALSIM_GetRoboRioUserFaults6V();
+}
 
 void RoboRioSim::SetUserFaults6V(int userFaults6V) {
   HALSIM_SetRoboRioUserFaults6V(userFaults6V);
@@ -235,7 +242,9 @@
   return store;
 }
 
-int RoboRioSim::GetUserFaults5V() { return HALSIM_GetRoboRioUserFaults5V(); }
+int RoboRioSim::GetUserFaults5V() {
+  return HALSIM_GetRoboRioUserFaults5V();
+}
 
 void RoboRioSim::SetUserFaults5V(int userFaults5V) {
   HALSIM_SetRoboRioUserFaults5V(userFaults5V);
@@ -250,10 +259,31 @@
   return store;
 }
 
-int RoboRioSim::GetUserFaults3V3() { return HALSIM_GetRoboRioUserFaults3V3(); }
+int RoboRioSim::GetUserFaults3V3() {
+  return HALSIM_GetRoboRioUserFaults3V3();
+}
 
 void RoboRioSim::SetUserFaults3V3(int userFaults3V3) {
   HALSIM_SetRoboRioUserFaults3V3(userFaults3V3);
 }
 
-void ResetData() { HALSIM_ResetRoboRioData(); }
+std::unique_ptr<CallbackStore> RoboRioSim::RegisterBrownoutVoltageCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      -1, callback, &HALSIM_CancelRoboRioBrownoutVoltageCallback);
+  store->SetUid(HALSIM_RegisterRoboRioBrownoutVoltageCallback(
+      &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+units::volt_t RoboRioSim::GetBrownoutVoltage() {
+  return units::volt_t(HALSIM_GetRoboRioBrownoutVoltage());
+}
+
+void RoboRioSim::SetBrownoutVoltage(units::volt_t vInVoltage) {
+  HALSIM_SetRoboRioBrownoutVoltage(vInVoltage.value());
+}
+
+void RoboRioSim::ResetData() {
+  HALSIM_ResetRoboRioData();
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/SPIAccelerometerSim.cpp b/wpilibc/src/main/native/cpp/simulation/SPIAccelerometerSim.cpp
index b71f99d..9483af3 100644
--- a/wpilibc/src/main/native/cpp/simulation/SPIAccelerometerSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/SPIAccelerometerSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/SPIAccelerometerSim.h"
 
@@ -15,7 +12,9 @@
 using namespace frc;
 using namespace frc::sim;
 
-SPIAccelerometerSim::SPIAccelerometerSim(int index) { m_index = index; }
+SPIAccelerometerSim::SPIAccelerometerSim(int index) {
+  m_index = index;
+}
 
 std::unique_ptr<CallbackStore> SPIAccelerometerSim::RegisterActiveCallback(
     NotifyCallback callback, bool initialNotify) {
diff --git a/wpilibc/src/main/native/cpp/simulation/SimDeviceSim.cpp b/wpilibc/src/main/native/cpp/simulation/SimDeviceSim.cpp
index 3d52cdf..34fd1e3 100644
--- a/wpilibc/src/main/native/cpp/simulation/SimDeviceSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/SimDeviceSim.cpp
@@ -1,15 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/SimDeviceSim.h"
 
 #include <string>
 #include <vector>
 
+#include <fmt/format.h>
 #include <hal/SimDevice.h>
 #include <hal/simulation/SimDeviceData.h>
 
@@ -19,10 +17,28 @@
 SimDeviceSim::SimDeviceSim(const char* name)
     : m_handle{HALSIM_GetSimDeviceHandle(name)} {}
 
+SimDeviceSim::SimDeviceSim(const char* name, int index) {
+  m_handle =
+      HALSIM_GetSimDeviceHandle(fmt::format("{}[{}]", name, index).c_str());
+}
+
+SimDeviceSim::SimDeviceSim(const char* name, int index, int channel) {
+  m_handle = HALSIM_GetSimDeviceHandle(
+      fmt::format("{}[{},{}]", name, index, channel).c_str());
+}
+
 hal::SimValue SimDeviceSim::GetValue(const char* name) const {
   return HALSIM_GetSimValueHandle(m_handle, name);
 }
 
+hal::SimInt SimDeviceSim::GetInt(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
+hal::SimLong SimDeviceSim::GetLong(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
 hal::SimDouble SimDeviceSim::GetDouble(const char* name) const {
   return HALSIM_GetSimValueHandle(m_handle, name);
 }
@@ -40,8 +56,12 @@
   const char** options = HALSIM_GetSimValueEnumOptions(val, &numOptions);
   std::vector<std::string> rv;
   rv.reserve(numOptions);
-  for (int32_t i = 0; i < numOptions; ++i) rv.emplace_back(options[i]);
+  for (int32_t i = 0; i < numOptions; ++i) {
+    rv.emplace_back(options[i]);
+  }
   return rv;
 }
 
-void SimDeviceSim::ResetData() { HALSIM_ResetSimDeviceData(); }
+void SimDeviceSim::ResetData() {
+  HALSIM_ResetSimDeviceData();
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/SimHooks.cpp b/wpilibc/src/main/native/cpp/simulation/SimHooks.cpp
index 28c434c..fe1cc65 100644
--- a/wpilibc/src/main/native/cpp/simulation/SimHooks.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/SimHooks.cpp
@@ -1,40 +1,51 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/SimHooks.h"
 
 #include <hal/simulation/MockHooks.h>
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
-void SetRuntimeType(HAL_RuntimeType type) { HALSIM_SetRuntimeType(type); }
+void SetRuntimeType(HAL_RuntimeType type) {
+  HALSIM_SetRuntimeType(type);
+}
 
-void WaitForProgramStart() { HALSIM_WaitForProgramStart(); }
+void WaitForProgramStart() {
+  HALSIM_WaitForProgramStart();
+}
 
-void SetProgramStarted() { HALSIM_SetProgramStarted(); }
+void SetProgramStarted() {
+  HALSIM_SetProgramStarted();
+}
 
-bool GetProgramStarted() { return HALSIM_GetProgramStarted(); }
+bool GetProgramStarted() {
+  return HALSIM_GetProgramStarted();
+}
 
-void RestartTiming() { HALSIM_RestartTiming(); }
+void RestartTiming() {
+  HALSIM_RestartTiming();
+}
 
-void PauseTiming() { HALSIM_PauseTiming(); }
+void PauseTiming() {
+  HALSIM_PauseTiming();
+}
 
-void ResumeTiming() { HALSIM_ResumeTiming(); }
+void ResumeTiming() {
+  HALSIM_ResumeTiming();
+}
 
-bool IsTimingPaused() { return HALSIM_IsTimingPaused(); }
+bool IsTimingPaused() {
+  return HALSIM_IsTimingPaused();
+}
 
 void StepTiming(units::second_t delta) {
-  HALSIM_StepTiming(static_cast<uint64_t>(delta.to<double>() * 1e6));
+  HALSIM_StepTiming(static_cast<uint64_t>(delta.value() * 1e6));
 }
 
 void StepTimingAsync(units::second_t delta) {
-  HALSIM_StepTimingAsync(static_cast<uint64_t>(delta.to<double>() * 1e6));
+  HALSIM_StepTimingAsync(static_cast<uint64_t>(delta.value() * 1e6));
 }
 
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/cpp/simulation/SingleJointedArmSim.cpp b/wpilibc/src/main/native/cpp/simulation/SingleJointedArmSim.cpp
index b33a19e..db56434 100644
--- a/wpilibc/src/main/native/cpp/simulation/SingleJointedArmSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/SingleJointedArmSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/SingleJointedArmSim.h"
 
@@ -12,7 +9,7 @@
 #include <units/voltage.h>
 #include <wpi/MathExtras.h>
 
-#include "frc/system/RungeKutta.h"
+#include "frc/system/NumericalIntegration.h"
 #include "frc/system/plant/LinearSystemId.h"
 
 using namespace frc;
@@ -42,18 +39,24 @@
           gearbox, gearing, armLength, minAngle, maxAngle, mass,
           simulateGravity, measurementStdDevs) {}
 
-bool SingleJointedArmSim::HasHitLowerLimit(
-    const Eigen::Matrix<double, 2, 1>& x) const {
-  return x(0) < m_minAngle.to<double>();
+bool SingleJointedArmSim::WouldHitLowerLimit(units::radian_t armAngle) const {
+  return armAngle < m_minAngle;
 }
 
-bool SingleJointedArmSim::HasHitUpperLimit(
-    const Eigen::Matrix<double, 2, 1>& x) const {
-  return x(0) > m_maxAngle.to<double>();
+bool SingleJointedArmSim::WouldHitUpperLimit(units::radian_t armAngle) const {
+  return armAngle > m_maxAngle;
+}
+
+bool SingleJointedArmSim::HasHitLowerLimit() const {
+  return WouldHitLowerLimit(units::radian_t(m_y(0)));
+}
+
+bool SingleJointedArmSim::HasHitUpperLimit() const {
+  return WouldHitUpperLimit(units::radian_t(m_y(0)));
 }
 
 units::radian_t SingleJointedArmSim::GetAngle() const {
-  return units::radian_t{m_x(0)};
+  return units::radian_t{m_y(0)};
 }
 
 units::radians_per_second_t SingleJointedArmSim::GetVelocity() const {
@@ -69,12 +72,12 @@
 }
 
 void SingleJointedArmSim::SetInputVoltage(units::volt_t voltage) {
-  SetInput(frc::MakeMatrix<1, 1>(voltage.to<double>()));
+  SetInput(Eigen::Vector<double, 1>{voltage.value()});
 }
 
-Eigen::Matrix<double, 2, 1> SingleJointedArmSim::UpdateX(
-    const Eigen::Matrix<double, 2, 1>& currentXhat,
-    const Eigen::Matrix<double, 1, 1>& u, units::second_t dt) {
+Eigen::Vector<double, 2> SingleJointedArmSim::UpdateX(
+    const Eigen::Vector<double, 2>& currentXhat,
+    const Eigen::Vector<double, 1>& u, units::second_t dt) {
   // Horizontal case:
   // Torque = F * r = I * alpha
   // alpha = F * r / I
@@ -85,24 +88,25 @@
   // We therefore find that f(x, u) = Ax + Bu + [[0] [m * g * r / I *
   // std::cos(theta)]]
 
-  auto updatedXhat = RungeKutta(
-      [&](const auto& x, const auto& u) -> Eigen::Matrix<double, 2, 1> {
-        Eigen::Matrix<double, 2, 1> xdot = m_plant.A() * x + m_plant.B() * u;
+  Eigen::Vector<double, 2> updatedXhat = RKDP(
+      [&](const auto& x, const auto& u) -> Eigen::Vector<double, 2> {
+        Eigen::Vector<double, 2> xdot = m_plant.A() * x + m_plant.B() * u;
 
         if (m_simulateGravity) {
-          xdot += MakeMatrix<2, 1>(0.0, (m_mass * m_r * -9.8 * 3.0 /
-                                         (m_mass * m_r * m_r) * std::cos(x(0)))
-                                            .template to<double>());
+          xdot += Eigen::Vector<double, 2>{
+              0.0, (m_mass * m_r * -9.8 * 3.0 / (m_mass * m_r * m_r) *
+                    std::cos(x(0)))
+                       .value()};
         }
         return xdot;
       },
       currentXhat, u, dt);
 
   // Check for collisions.
-  if (HasHitLowerLimit(updatedXhat)) {
-    return MakeMatrix<2, 1>(m_minAngle.to<double>(), 0.0);
-  } else if (HasHitUpperLimit(updatedXhat)) {
-    return MakeMatrix<2, 1>(m_maxAngle.to<double>(), 0.0);
+  if (WouldHitLowerLimit(units::radian_t(updatedXhat(0)))) {
+    return Eigen::Vector<double, 2>{m_minAngle.value(), 0.0};
+  } else if (WouldHitUpperLimit(units::radian_t(updatedXhat(0)))) {
+    return Eigen::Vector<double, 2>{m_maxAngle.value(), 0.0};
   }
   return updatedXhat;
 }
diff --git a/wpilibc/src/main/native/cpp/simulation/UltrasonicSim.cpp b/wpilibc/src/main/native/cpp/simulation/UltrasonicSim.cpp
new file mode 100644
index 0000000..d2d1687
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/simulation/UltrasonicSim.cpp
@@ -0,0 +1,24 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/UltrasonicSim.h"
+
+#include "frc/Ultrasonic.h"
+#include "frc/simulation/SimDeviceSim.h"
+
+using namespace frc::sim;
+
+UltrasonicSim::UltrasonicSim(const frc::Ultrasonic& ultrasonic) {
+  frc::sim::SimDeviceSim deviceSim{"Ultrasonic", ultrasonic.GetEchoChannel()};
+  m_simRangeValid = deviceSim.GetBoolean("Range Valid");
+  m_simRange = deviceSim.GetDouble("Range (in)");
+}
+
+void UltrasonicSim::SetRangeValid(bool isValid) {
+  m_simRangeValid.Set(isValid);
+}
+
+void UltrasonicSim::SetRange(units::meter_t range) {
+  m_simRange.Set(range.value());
+}
diff --git a/wpilibc/src/main/native/cpp/simulation/XboxControllerSim.cpp b/wpilibc/src/main/native/cpp/simulation/XboxControllerSim.cpp
index e3bbdce..393c41a 100644
--- a/wpilibc/src/main/native/cpp/simulation/XboxControllerSim.cpp
+++ b/wpilibc/src/main/native/cpp/simulation/XboxControllerSim.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/simulation/XboxControllerSim.h"
 
@@ -23,68 +20,66 @@
   SetButtonCount(10);
 }
 
-void XboxControllerSim::SetX(GenericHID::JoystickHand hand, double value) {
-  if (hand == GenericHID::kLeftHand) {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kLeftX), value);
-  } else {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kRightX), value);
-  }
+void XboxControllerSim::SetLeftX(double value) {
+  SetRawAxis(XboxController::Axis::kLeftX, value);
 }
 
-void XboxControllerSim::SetY(GenericHID::JoystickHand hand, double value) {
-  if (hand == GenericHID::kLeftHand) {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kLeftY), value);
-  } else {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kRightY), value);
-  }
+void XboxControllerSim::SetRightX(double value) {
+  SetRawAxis(XboxController::Axis::kRightX, value);
 }
 
-void XboxControllerSim::SetTriggerAxis(GenericHID::JoystickHand hand,
-                                       double value) {
-  if (hand == GenericHID::kLeftHand) {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kLeftTrigger), value);
-  } else {
-    SetRawAxis(static_cast<int>(XboxController::Axis::kRightTrigger), value);
-  }
+void XboxControllerSim::SetLeftY(double value) {
+  SetRawAxis(XboxController::Axis::kLeftY, value);
 }
 
-void XboxControllerSim::SetBumper(GenericHID::JoystickHand hand, bool state) {
-  if (hand == GenericHID::kLeftHand) {
-    SetRawButton(static_cast<int>(XboxController::Button::kBumperLeft), state);
-  } else {
-    SetRawButton(static_cast<int>(XboxController::Button::kBumperRight), state);
-  }
+void XboxControllerSim::SetRightY(double value) {
+  SetRawAxis(XboxController::Axis::kRightY, value);
 }
 
-void XboxControllerSim::SetStickButton(GenericHID::JoystickHand hand,
-                                       bool state) {
-  if (hand == GenericHID::kLeftHand) {
-    SetRawButton(static_cast<int>(XboxController::Button::kStickLeft), state);
-  } else {
-    SetRawButton(static_cast<int>(XboxController::Button::kStickRight), state);
-  }
+void XboxControllerSim::SetLeftTriggerAxis(double value) {
+  SetRawAxis(XboxController::Axis::kLeftTrigger, value);
+}
+
+void XboxControllerSim::SetRightTriggerAxis(double value) {
+  SetRawAxis(XboxController::Axis::kRightTrigger, value);
+}
+
+void XboxControllerSim::SetLeftBumper(bool state) {
+  SetRawButton(XboxController::Button::kLeftBumper, state);
+}
+
+void XboxControllerSim::SetRightBumper(bool state) {
+  SetRawButton(XboxController::Button::kRightBumper, state);
+}
+
+void XboxControllerSim::SetLeftStickButton(bool state) {
+  SetRawButton(XboxController::Button::kLeftStick, state);
+}
+
+void XboxControllerSim::SetRightStickButton(bool state) {
+  SetRawButton(XboxController::Button::kRightStick, state);
 }
 
 void XboxControllerSim::SetAButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kA), state);
+  SetRawButton(XboxController::Button::kA, state);
 }
 
 void XboxControllerSim::SetBButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kB), state);
+  SetRawButton(XboxController::Button::kB, state);
 }
 
 void XboxControllerSim::SetXButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kX), state);
+  SetRawButton(XboxController::Button::kX, state);
 }
 
 void XboxControllerSim::SetYButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kY), state);
+  SetRawButton(XboxController::Button::kY, state);
 }
 
 void XboxControllerSim::SetBackButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kBack), state);
+  SetRawButton(XboxController::Button::kBack, state);
 }
 
 void XboxControllerSim::SetStartButton(bool state) {
-  SetRawButton(static_cast<int>(XboxController::Button::kStart), state);
+  SetRawButton(XboxController::Button::kStart, state);
 }
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/Field2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/Field2d.cpp
new file mode 100644
index 0000000..2915a12
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/Field2d.cpp
@@ -0,0 +1,80 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/Field2d.h"
+
+#include <networktables/NTSendableBuilder.h>
+#include <wpi/sendable/SendableRegistry.h>
+
+using namespace frc;
+
+Field2d::Field2d() {
+  m_objects.emplace_back(
+      std::make_unique<FieldObject2d>("Robot", FieldObject2d::private_init{}));
+  m_objects[0]->SetPose(Pose2d{});
+  wpi::SendableRegistry::Add(this, "Field");
+}
+
+Field2d::Field2d(Field2d&& rhs) : SendableHelper(std::move(rhs)) {
+  std::swap(m_table, rhs.m_table);
+  std::swap(m_objects, rhs.m_objects);
+}
+
+Field2d& Field2d::operator=(Field2d&& rhs) {
+  SendableHelper::operator=(std::move(rhs));
+
+  std::swap(m_table, rhs.m_table);
+  std::swap(m_objects, rhs.m_objects);
+
+  return *this;
+}
+
+void Field2d::SetRobotPose(const Pose2d& pose) {
+  std::scoped_lock lock(m_mutex);
+  m_objects[0]->SetPose(pose);
+}
+
+void Field2d::SetRobotPose(units::meter_t x, units::meter_t y,
+                           Rotation2d rotation) {
+  std::scoped_lock lock(m_mutex);
+  m_objects[0]->SetPose(x, y, rotation);
+}
+
+Pose2d Field2d::GetRobotPose() const {
+  std::scoped_lock lock(m_mutex);
+  return m_objects[0]->GetPose();
+}
+
+FieldObject2d* Field2d::GetObject(std::string_view name) {
+  std::scoped_lock lock(m_mutex);
+  for (auto&& obj : m_objects) {
+    if (obj->m_name == name) {
+      return obj.get();
+    }
+  }
+  m_objects.emplace_back(
+      std::make_unique<FieldObject2d>(name, FieldObject2d::private_init{}));
+  auto obj = m_objects.back().get();
+  if (m_table) {
+    obj->m_entry = m_table->GetEntry(obj->m_name);
+  }
+  return obj;
+}
+
+FieldObject2d* Field2d::GetRobotObject() {
+  std::scoped_lock lock(m_mutex);
+  return m_objects[0].get();
+}
+
+void Field2d::InitSendable(nt::NTSendableBuilder& builder) {
+  builder.SetSmartDashboardType("Field2d");
+
+  std::scoped_lock lock(m_mutex);
+  m_table = builder.GetTable();
+  for (auto&& obj : m_objects) {
+    std::scoped_lock lock2(obj->m_mutex);
+    obj->m_entry = m_table->GetEntry(obj->m_name);
+    obj->UpdateEntry(true);
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/FieldObject2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/FieldObject2d.cpp
new file mode 100644
index 0000000..93d6d7e
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/FieldObject2d.cpp
@@ -0,0 +1,170 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/FieldObject2d.h"
+
+#include <vector>
+
+#include <wpi/Endian.h>
+#include <wpi/MathExtras.h>
+
+#include "frc/trajectory/Trajectory.h"
+
+using namespace frc;
+
+FieldObject2d::FieldObject2d(FieldObject2d&& rhs) {
+  std::swap(m_name, rhs.m_name);
+  std::swap(m_entry, rhs.m_entry);
+  std::swap(m_poses, rhs.m_poses);
+}
+
+FieldObject2d& FieldObject2d::operator=(FieldObject2d&& rhs) {
+  std::swap(m_name, rhs.m_name);
+  std::swap(m_entry, rhs.m_entry);
+  std::swap(m_poses, rhs.m_poses);
+
+  return *this;
+}
+
+void FieldObject2d::SetPose(const Pose2d& pose) {
+  SetPoses({pose});
+}
+
+void FieldObject2d::SetPose(units::meter_t x, units::meter_t y,
+                            Rotation2d rotation) {
+  SetPoses({{x, y, rotation}});
+}
+
+Pose2d FieldObject2d::GetPose() const {
+  std::scoped_lock lock(m_mutex);
+  UpdateFromEntry();
+  if (m_poses.empty()) {
+    return {};
+  }
+  return m_poses[0];
+}
+
+void FieldObject2d::SetPoses(wpi::span<const Pose2d> poses) {
+  std::scoped_lock lock(m_mutex);
+  m_poses.assign(poses.begin(), poses.end());
+  UpdateEntry();
+}
+
+void FieldObject2d::SetPoses(std::initializer_list<Pose2d> poses) {
+  SetPoses({poses.begin(), poses.end()});
+}
+
+void FieldObject2d::SetTrajectory(const Trajectory& trajectory) {
+  std::scoped_lock lock(m_mutex);
+  m_poses.clear();
+  m_poses.reserve(trajectory.States().size());
+  for (auto&& state : trajectory.States()) {
+    m_poses.push_back(state.pose);
+  }
+  UpdateEntry();
+}
+
+std::vector<Pose2d> FieldObject2d::GetPoses() const {
+  std::scoped_lock lock(m_mutex);
+  UpdateFromEntry();
+  return std::vector<Pose2d>(m_poses.begin(), m_poses.end());
+}
+
+wpi::span<const Pose2d> FieldObject2d::GetPoses(
+    wpi::SmallVectorImpl<Pose2d>& out) const {
+  std::scoped_lock lock(m_mutex);
+  UpdateFromEntry();
+  out.assign(m_poses.begin(), m_poses.end());
+  return out;
+}
+
+void FieldObject2d::UpdateEntry(bool setDefault) {
+  if (!m_entry) {
+    return;
+  }
+  if (m_poses.size() < (255 / 3)) {
+    wpi::SmallVector<double, 9> arr;
+    for (auto&& pose : m_poses) {
+      auto& translation = pose.Translation();
+      arr.push_back(translation.X().value());
+      arr.push_back(translation.Y().value());
+      arr.push_back(pose.Rotation().Degrees().value());
+    }
+    if (setDefault) {
+      m_entry.SetDefaultDoubleArray(arr);
+    } else {
+      m_entry.ForceSetDoubleArray(arr);
+    }
+  } else {
+    // send as raw array of doubles if too big for NT array
+    std::vector<char> arr;
+    arr.resize(m_poses.size() * 3 * 8);
+    char* p = arr.data();
+    for (auto&& pose : m_poses) {
+      auto& translation = pose.Translation();
+      wpi::support::endian::write64be(
+          p, wpi::DoubleToBits(translation.X().value()));
+      p += 8;
+      wpi::support::endian::write64be(
+          p, wpi::DoubleToBits(translation.Y().value()));
+      p += 8;
+      wpi::support::endian::write64be(
+          p, wpi::DoubleToBits(pose.Rotation().Degrees().value()));
+      p += 8;
+    }
+    if (setDefault) {
+      m_entry.SetDefaultRaw({arr.data(), arr.size()});
+    } else {
+      m_entry.ForceSetRaw({arr.data(), arr.size()});
+    }
+  }
+}
+
+void FieldObject2d::UpdateFromEntry() const {
+  if (!m_entry) {
+    return;
+  }
+  auto val = m_entry.GetValue();
+  if (!val) {
+    return;
+  }
+
+  if (val->IsDoubleArray()) {
+    auto arr = val->GetDoubleArray();
+    auto size = arr.size();
+    if ((size % 3) != 0) {
+      return;
+    }
+    m_poses.resize(size / 3);
+    for (size_t i = 0; i < size / 3; ++i) {
+      m_poses[i] =
+          Pose2d{units::meter_t{arr[i * 3 + 0]}, units::meter_t{arr[i * 3 + 1]},
+                 Rotation2d{units::degree_t{arr[i * 3 + 2]}}};
+    }
+  } else if (val->IsRaw()) {
+    // treat it simply as an array of doubles
+    std::string_view data = val->GetRaw();
+
+    // must be triples of doubles
+    auto size = data.size();
+    if ((size % (3 * 8)) != 0) {
+      return;
+    }
+    m_poses.resize(size / (3 * 8));
+    const char* p = data.data();
+    for (size_t i = 0; i < size / (3 * 8); ++i) {
+      double x = wpi::BitsToDouble(
+          wpi::support::endian::readNext<uint64_t, wpi::support::big,
+                                         wpi::support::unaligned>(p));
+      double y = wpi::BitsToDouble(
+          wpi::support::endian::readNext<uint64_t, wpi::support::big,
+                                         wpi::support::unaligned>(p));
+      double rot = wpi::BitsToDouble(
+          wpi::support::endian::readNext<uint64_t, wpi::support::big,
+                                         wpi::support::unaligned>(p));
+      m_poses[i] = Pose2d{units::meter_t{x}, units::meter_t{y},
+                          Rotation2d{units::degree_t{rot}}};
+    }
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/ListenerExecutor.cpp b/wpilibc/src/main/native/cpp/smartdashboard/ListenerExecutor.cpp
index 75b373a..2a53196 100644
--- a/wpilibc/src/main/native/cpp/smartdashboard/ListenerExecutor.cpp
+++ b/wpilibc/src/main/native/cpp/smartdashboard/ListenerExecutor.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/smartdashboard/ListenerExecutor.h"
 
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/Mechanism2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/Mechanism2d.cpp
new file mode 100644
index 0000000..bfa827a
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/Mechanism2d.cpp
@@ -0,0 +1,55 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/Mechanism2d.h"
+
+#include <cstdio>
+
+#include <networktables/NTSendableBuilder.h>
+
+using namespace frc;
+
+static constexpr char kBackgroundColor[] = "backgroundColor";
+static constexpr char kDims[] = "dims";
+
+Mechanism2d::Mechanism2d(double width, double height,
+                         const Color8Bit& backgroundColor)
+    : m_width{width}, m_height{height} {
+  SetBackgroundColor(backgroundColor);
+}
+
+MechanismRoot2d* Mechanism2d::GetRoot(std::string_view name, double x,
+                                      double y) {
+  auto& obj = m_roots[name];
+  if (obj) {
+    return obj.get();
+  }
+  obj = std::make_unique<MechanismRoot2d>(name, x, y,
+                                          MechanismRoot2d::private_init{});
+  if (m_table) {
+    obj->Update(m_table->GetSubTable(name));
+  }
+  return obj.get();
+}
+
+void Mechanism2d::SetBackgroundColor(const Color8Bit& color) {
+  std::snprintf(m_color, sizeof(m_color), "#%02X%02X%02X", color.red,
+                color.green, color.blue);
+  if (m_table) {
+    m_table->GetEntry(kBackgroundColor).SetString(m_color);
+  }
+}
+
+void Mechanism2d::InitSendable(nt::NTSendableBuilder& builder) {
+  builder.SetSmartDashboardType("Mechanism2d");
+
+  std::scoped_lock lock(m_mutex);
+  m_table = builder.GetTable();
+  m_table->GetEntry(kDims).SetDoubleArray({m_width, m_height});
+  m_table->GetEntry(kBackgroundColor).SetString(m_color);
+  for (const auto& entry : m_roots) {
+    const auto& root = entry.getValue().get();
+    root->Update(m_table->GetSubTable(entry.getKey()));
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/MechanismLigament2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/MechanismLigament2d.cpp
new file mode 100644
index 0000000..175db0d
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/MechanismLigament2d.cpp
@@ -0,0 +1,82 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/MechanismLigament2d.h"
+
+#include <cstdio>
+
+using namespace frc;
+
+MechanismLigament2d::MechanismLigament2d(std::string_view name, double length,
+                                         units::degree_t angle,
+                                         double lineWeight,
+                                         const frc::Color8Bit& color)
+    : MechanismObject2d(name),
+      m_length{length},
+      m_angle{angle.value()},
+      m_weight{lineWeight} {
+  SetColor(color);
+}
+
+void MechanismLigament2d::UpdateEntries(
+    std::shared_ptr<nt::NetworkTable> table) {
+  std::scoped_lock lock(m_mutex);
+  table->GetEntry(".type").SetString("line");
+
+  m_colorEntry = table->GetEntry("color");
+  m_angleEntry = table->GetEntry("angle");
+  m_weightEntry = table->GetEntry("weight");
+  m_lengthEntry = table->GetEntry("length");
+  Flush();
+}
+
+void MechanismLigament2d::SetColor(const Color8Bit& color) {
+  std::scoped_lock lock(m_mutex);
+  std::snprintf(m_color, sizeof(m_color), "#%02X%02X%02X", color.red,
+                color.green, color.blue);
+  Flush();
+}
+
+void MechanismLigament2d::SetAngle(units::degree_t angle) {
+  std::scoped_lock lock(m_mutex);
+  m_angle = angle.value();
+  Flush();
+}
+
+void MechanismLigament2d::SetLineWeight(double lineWidth) {
+  std::scoped_lock lock(m_mutex);
+  m_weight = lineWidth;
+  Flush();
+}
+
+double MechanismLigament2d::GetAngle() {
+  if (m_angleEntry) {
+    m_angle = m_angleEntry.GetDouble(0.0);
+  }
+  return m_angle;
+}
+
+double MechanismLigament2d::GetLength() {
+  if (m_lengthEntry) {
+    m_length = m_lengthEntry.GetDouble(0.0);
+  }
+  return m_length;
+}
+
+void MechanismLigament2d::SetLength(double length) {
+  std::scoped_lock lock(m_mutex);
+  m_length = length;
+  Flush();
+}
+
+#define SAFE_WRITE(data, Type)           \
+  if (m_##data##Entry) {                 \
+    m_##data##Entry.Set##Type(m_##data); \
+  }
+void MechanismLigament2d::Flush() {
+  SAFE_WRITE(color, String)
+  SAFE_WRITE(angle, Double)
+  SAFE_WRITE(length, Double)
+  SAFE_WRITE(weight, Double)
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/MechanismObject2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/MechanismObject2d.cpp
new file mode 100644
index 0000000..15d24a3
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/MechanismObject2d.cpp
@@ -0,0 +1,23 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/MechanismObject2d.h"
+
+using namespace frc;
+
+MechanismObject2d::MechanismObject2d(std::string_view name) : m_name{name} {}
+
+const std::string& MechanismObject2d::GetName() const {
+  return m_name;
+}
+
+void MechanismObject2d::Update(std::shared_ptr<nt::NetworkTable> table) {
+  std::scoped_lock lock(m_mutex);
+  m_table = table;
+  UpdateEntries(m_table);
+  for (const wpi::StringMapEntry<std::unique_ptr<MechanismObject2d>>& entry :
+       m_objects) {
+    entry.getValue()->Update(m_table->GetSubTable(entry.getKey()));
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/MechanismRoot2d.cpp b/wpilibc/src/main/native/cpp/smartdashboard/MechanismRoot2d.cpp
new file mode 100644
index 0000000..07d15f0
--- /dev/null
+++ b/wpilibc/src/main/native/cpp/smartdashboard/MechanismRoot2d.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/smartdashboard/MechanismRoot2d.h"
+
+#include "frc/util/Color8Bit.h"
+
+using namespace frc;
+
+MechanismRoot2d::MechanismRoot2d(std::string_view name, double x, double y,
+                                 const private_init&)
+    : MechanismObject2d(name), m_x{x}, m_y{y} {}
+
+void MechanismRoot2d::SetPosition(double x, double y) {
+  std::scoped_lock lock(m_mutex);
+  m_x = x;
+  m_y = y;
+  Flush();
+}
+
+void MechanismRoot2d::UpdateEntries(std::shared_ptr<nt::NetworkTable> table) {
+  std::scoped_lock lock(m_mutex);
+  m_xEntry = table->GetEntry("x");
+  m_yEntry = table->GetEntry("y");
+  Flush();
+}
+
+inline void MechanismRoot2d::Flush() {
+  std::scoped_lock lock(m_mutex);
+  if (m_xEntry) {
+    m_xEntry.SetDouble(m_x);
+  }
+  if (m_yEntry) {
+    m_yEntry.SetDouble(m_y);
+  }
+}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/SendableBase.cpp b/wpilibc/src/main/native/cpp/smartdashboard/SendableBase.cpp
deleted file mode 100644
index 7fc8635..0000000
--- a/wpilibc/src/main/native/cpp/smartdashboard/SendableBase.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/smartdashboard/SendableBase.h"
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-using namespace frc;
-
-SendableBase::SendableBase(bool addLiveWindow) {
-  if (addLiveWindow)
-    SendableRegistry::GetInstance().AddLW(this, "");
-  else
-    SendableRegistry::GetInstance().Add(this, "");
-}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/SendableBuilderImpl.cpp b/wpilibc/src/main/native/cpp/smartdashboard/SendableBuilderImpl.cpp
index 135f4be..48af198 100644
--- a/wpilibc/src/main/native/cpp/smartdashboard/SendableBuilderImpl.cpp
+++ b/wpilibc/src/main/native/cpp/smartdashboard/SendableBuilderImpl.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/smartdashboard/SendableBuilderImpl.h"
 
@@ -23,14 +20,20 @@
   return m_table;
 }
 
-bool SendableBuilderImpl::HasTable() const { return m_table != nullptr; }
+bool SendableBuilderImpl::IsPublished() const {
+  return m_table != nullptr;
+}
 
-bool SendableBuilderImpl::IsActuator() const { return m_actuator; }
+bool SendableBuilderImpl::IsActuator() const {
+  return m_actuator;
+}
 
-void SendableBuilderImpl::UpdateTable() {
+void SendableBuilderImpl::Update() {
   uint64_t time = nt::Now();
   for (auto& property : m_properties) {
-    if (property.update) property.update(property.entry, time);
+    if (property.update) {
+      property.update(property.entry, time);
+    }
   }
   for (auto& updateTable : m_updateTables) {
     updateTable();
@@ -38,28 +41,42 @@
 }
 
 void SendableBuilderImpl::StartListeners() {
-  for (auto& property : m_properties) property.StartListener();
-  if (m_controllableEntry) m_controllableEntry.SetBoolean(true);
+  for (auto& property : m_properties) {
+    property.StartListener();
+  }
+  if (m_controllableEntry) {
+    m_controllableEntry.SetBoolean(true);
+  }
 }
 
 void SendableBuilderImpl::StopListeners() {
-  for (auto& property : m_properties) property.StopListener();
-  if (m_controllableEntry) m_controllableEntry.SetBoolean(false);
+  for (auto& property : m_properties) {
+    property.StopListener();
+  }
+  if (m_controllableEntry) {
+    m_controllableEntry.SetBoolean(false);
+  }
 }
 
 void SendableBuilderImpl::StartLiveWindowMode() {
-  if (m_safeState) m_safeState();
+  if (m_safeState) {
+    m_safeState();
+  }
   StartListeners();
 }
 
 void SendableBuilderImpl::StopLiveWindowMode() {
   StopListeners();
-  if (m_safeState) m_safeState();
+  if (m_safeState) {
+    m_safeState();
+  }
 }
 
-void SendableBuilderImpl::ClearProperties() { m_properties.clear(); }
+void SendableBuilderImpl::ClearProperties() {
+  m_properties.clear();
+}
 
-void SendableBuilderImpl::SetSmartDashboardType(const wpi::Twine& type) {
+void SendableBuilderImpl::SetSmartDashboardType(std::string_view type) {
   m_table->GetEntry(".type").SetString(type);
 }
 
@@ -76,11 +93,11 @@
   m_updateTables.emplace_back(std::move(func));
 }
 
-nt::NetworkTableEntry SendableBuilderImpl::GetEntry(const wpi::Twine& key) {
+nt::NetworkTableEntry SendableBuilderImpl::GetEntry(std::string_view key) {
   return m_table->GetEntry(key);
 }
 
-void SendableBuilderImpl::AddBooleanProperty(const wpi::Twine& key,
+void SendableBuilderImpl::AddBooleanProperty(std::string_view key,
                                              std::function<bool()> getter,
                                              std::function<void(bool)> setter) {
   m_properties.emplace_back(*m_table, key);
@@ -95,7 +112,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsBoolean()) return;
+            if (!event.value->IsBoolean()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetBoolean()); });
           },
@@ -105,7 +124,7 @@
 }
 
 void SendableBuilderImpl::AddDoubleProperty(
-    const wpi::Twine& key, std::function<double()> getter,
+    std::string_view key, std::function<double()> getter,
     std::function<void(double)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
@@ -119,7 +138,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsDouble()) return;
+            if (!event.value->IsDouble()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetDouble()); });
           },
@@ -129,8 +150,8 @@
 }
 
 void SendableBuilderImpl::AddStringProperty(
-    const wpi::Twine& key, std::function<std::string()> getter,
-    std::function<void(wpi::StringRef)> setter) {
+    std::string_view key, std::function<std::string()> getter,
+    std::function<void(std::string_view)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -143,7 +164,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsString()) return;
+            if (!event.value->IsString()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetString()); });
           },
@@ -153,8 +176,8 @@
 }
 
 void SendableBuilderImpl::AddBooleanArrayProperty(
-    const wpi::Twine& key, std::function<std::vector<int>()> getter,
-    std::function<void(wpi::ArrayRef<int>)> setter) {
+    std::string_view key, std::function<std::vector<int>()> getter,
+    std::function<void(wpi::span<const int>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -167,7 +190,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsBooleanArray()) return;
+            if (!event.value->IsBooleanArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetBooleanArray()); });
           },
@@ -177,8 +202,8 @@
 }
 
 void SendableBuilderImpl::AddDoubleArrayProperty(
-    const wpi::Twine& key, std::function<std::vector<double>()> getter,
-    std::function<void(wpi::ArrayRef<double>)> setter) {
+    std::string_view key, std::function<std::vector<double>()> getter,
+    std::function<void(wpi::span<const double>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -191,7 +216,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsDoubleArray()) return;
+            if (!event.value->IsDoubleArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetDoubleArray()); });
           },
@@ -201,8 +228,8 @@
 }
 
 void SendableBuilderImpl::AddStringArrayProperty(
-    const wpi::Twine& key, std::function<std::vector<std::string>()> getter,
-    std::function<void(wpi::ArrayRef<std::string>)> setter) {
+    std::string_view key, std::function<std::vector<std::string>()> getter,
+    std::function<void(wpi::span<const std::string>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -215,7 +242,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsStringArray()) return;
+            if (!event.value->IsStringArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetStringArray()); });
           },
@@ -225,8 +254,8 @@
 }
 
 void SendableBuilderImpl::AddRawProperty(
-    const wpi::Twine& key, std::function<std::string()> getter,
-    std::function<void(wpi::StringRef)> setter) {
+    std::string_view key, std::function<std::string()> getter,
+    std::function<void(std::string_view)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -239,7 +268,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsRaw()) return;
+            if (!event.value->IsRaw()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetRaw()); });
           },
@@ -249,7 +280,7 @@
 }
 
 void SendableBuilderImpl::AddValueProperty(
-    const wpi::Twine& key, std::function<std::shared_ptr<nt::Value>()> getter,
+    std::string_view key, std::function<std::shared_ptr<nt::Value>()> getter,
     std::function<void(std::shared_ptr<nt::Value>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
@@ -271,9 +302,9 @@
 }
 
 void SendableBuilderImpl::AddSmallStringProperty(
-    const wpi::Twine& key,
-    std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-    std::function<void(wpi::StringRef)> setter) {
+    std::string_view key,
+    std::function<std::string_view(wpi::SmallVectorImpl<char>& buf)> getter,
+    std::function<void(std::string_view)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -287,7 +318,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsString()) return;
+            if (!event.value->IsString()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetString()); });
           },
@@ -297,9 +330,9 @@
 }
 
 void SendableBuilderImpl::AddSmallBooleanArrayProperty(
-    const wpi::Twine& key,
-    std::function<wpi::ArrayRef<int>(wpi::SmallVectorImpl<int>& buf)> getter,
-    std::function<void(wpi::ArrayRef<int>)> setter) {
+    std::string_view key,
+    std::function<wpi::span<const int>(wpi::SmallVectorImpl<int>& buf)> getter,
+    std::function<void(wpi::span<const int>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -313,7 +346,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsBooleanArray()) return;
+            if (!event.value->IsBooleanArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetBooleanArray()); });
           },
@@ -323,10 +358,10 @@
 }
 
 void SendableBuilderImpl::AddSmallDoubleArrayProperty(
-    const wpi::Twine& key,
-    std::function<wpi::ArrayRef<double>(wpi::SmallVectorImpl<double>& buf)>
+    std::string_view key,
+    std::function<wpi::span<const double>(wpi::SmallVectorImpl<double>& buf)>
         getter,
-    std::function<void(wpi::ArrayRef<double>)> setter) {
+    std::function<void(wpi::span<const double>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -340,7 +375,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsDoubleArray()) return;
+            if (!event.value->IsDoubleArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetDoubleArray()); });
           },
@@ -350,11 +387,11 @@
 }
 
 void SendableBuilderImpl::AddSmallStringArrayProperty(
-    const wpi::Twine& key,
+    std::string_view key,
     std::function<
-        wpi::ArrayRef<std::string>(wpi::SmallVectorImpl<std::string>& buf)>
+        wpi::span<const std::string>(wpi::SmallVectorImpl<std::string>& buf)>
         getter,
-    std::function<void(wpi::ArrayRef<std::string>)> setter) {
+    std::function<void(wpi::span<const std::string>)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -368,7 +405,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsStringArray()) return;
+            if (!event.value->IsStringArray()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetStringArray()); });
           },
@@ -378,9 +417,9 @@
 }
 
 void SendableBuilderImpl::AddSmallRawProperty(
-    const wpi::Twine& key,
-    std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-    std::function<void(wpi::StringRef)> setter) {
+    std::string_view key,
+    std::function<std::string_view(wpi::SmallVectorImpl<char>& buf)> getter,
+    std::function<void(std::string_view)> setter) {
   m_properties.emplace_back(*m_table, key);
   if (getter) {
     m_properties.back().update = [=](nt::NetworkTableEntry entry,
@@ -394,7 +433,9 @@
         [=](nt::NetworkTableEntry entry) -> NT_EntryListener {
       return entry.AddListener(
           [=](const nt::EntryNotification& event) {
-            if (!event.value->IsRaw()) return;
+            if (!event.value->IsRaw()) {
+              return;
+            }
             SmartDashboard::PostListenerTask(
                 [=] { setter(event.value->GetRaw()); });
           },
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/SendableChooserBase.cpp b/wpilibc/src/main/native/cpp/smartdashboard/SendableChooserBase.cpp
index 2f7af9c..550d40c 100644
--- a/wpilibc/src/main/native/cpp/smartdashboard/SendableChooserBase.cpp
+++ b/wpilibc/src/main/native/cpp/smartdashboard/SendableChooserBase.cpp
@@ -1,20 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/smartdashboard/SendableChooserBase.h"
 
-#include "frc/smartdashboard/SendableRegistry.h"
+#include <wpi/sendable/SendableRegistry.h>
 
 using namespace frc;
 
 std::atomic_int SendableChooserBase::s_instances{0};
 
 SendableChooserBase::SendableChooserBase() : m_instance{s_instances++} {
-  SendableRegistry::GetInstance().Add(this, "SendableChooser", m_instance);
+  wpi::SendableRegistry::Add(this, "SendableChooser", m_instance);
 }
 
 SendableChooserBase::SendableChooserBase(SendableChooserBase&& oth)
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/SendableRegistry.cpp b/wpilibc/src/main/native/cpp/smartdashboard/SendableRegistry.cpp
deleted file mode 100644
index 4480313..0000000
--- a/wpilibc/src/main/native/cpp/smartdashboard/SendableRegistry.cpp
+++ /dev/null
@@ -1,372 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-#include <memory>
-
-#include <wpi/DenseMap.h>
-#include <wpi/SmallVector.h>
-#include <wpi/UidVector.h>
-#include <wpi/mutex.h>
-
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableBuilderImpl.h"
-
-using namespace frc;
-
-struct SendableRegistry::Impl {
-  struct Component {
-    Sendable* sendable = nullptr;
-    SendableBuilderImpl builder;
-    std::string name;
-    std::string subsystem = "Ungrouped";
-    Sendable* parent = nullptr;
-    bool liveWindow = false;
-    wpi::SmallVector<std::shared_ptr<void>, 2> data;
-
-    void SetName(const wpi::Twine& moduleType, int channel) {
-      name =
-          (moduleType + wpi::Twine('[') + wpi::Twine(channel) + wpi::Twine(']'))
-              .str();
-    }
-
-    void SetName(const wpi::Twine& moduleType, int moduleNumber, int channel) {
-      name = (moduleType + wpi::Twine('[') + wpi::Twine(moduleNumber) +
-              wpi::Twine(',') + wpi::Twine(channel) + wpi::Twine(']'))
-                 .str();
-    }
-  };
-
-  wpi::recursive_mutex mutex;
-
-  wpi::UidVector<std::unique_ptr<Component>, 32> components;
-  wpi::DenseMap<void*, UID> componentMap;
-  int nextDataHandle = 0;
-
-  Component& GetOrAdd(void* sendable, UID* uid = nullptr);
-};
-
-SendableRegistry::Impl::Component& SendableRegistry::Impl::GetOrAdd(
-    void* sendable, UID* uid) {
-  UID& compUid = componentMap[sendable];
-  if (compUid == 0)
-    compUid = components.emplace_back(std::make_unique<Component>()) + 1;
-  if (uid) *uid = compUid;
-
-  return *components[compUid - 1];
-}
-
-SendableRegistry& SendableRegistry::GetInstance() {
-  static SendableRegistry instance;
-  return instance;
-}
-
-void SendableRegistry::Add(Sendable* sendable, const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.name = name.str();
-}
-
-void SendableRegistry::Add(Sendable* sendable, const wpi::Twine& moduleType,
-                           int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.SetName(moduleType, channel);
-}
-
-void SendableRegistry::Add(Sendable* sendable, const wpi::Twine& moduleType,
-                           int moduleNumber, int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.SetName(moduleType, moduleNumber, channel);
-}
-
-void SendableRegistry::Add(Sendable* sendable, const wpi::Twine& subsystem,
-                           const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.name = name.str();
-  comp.subsystem = subsystem.str();
-}
-
-void SendableRegistry::AddLW(Sendable* sendable, const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.liveWindow = true;
-  comp.name = name.str();
-}
-
-void SendableRegistry::AddLW(Sendable* sendable, const wpi::Twine& moduleType,
-                             int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.liveWindow = true;
-  comp.SetName(moduleType, channel);
-}
-
-void SendableRegistry::AddLW(Sendable* sendable, const wpi::Twine& moduleType,
-                             int moduleNumber, int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.liveWindow = true;
-  comp.SetName(moduleType, moduleNumber, channel);
-}
-
-void SendableRegistry::AddLW(Sendable* sendable, const wpi::Twine& subsystem,
-                             const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(sendable);
-  comp.sendable = sendable;
-  comp.liveWindow = true;
-  comp.name = name.str();
-  comp.subsystem = subsystem.str();
-}
-
-void SendableRegistry::AddChild(Sendable* parent, Sendable* child) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(child);
-  comp.parent = parent;
-}
-
-void SendableRegistry::AddChild(Sendable* parent, void* child) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto& comp = m_impl->GetOrAdd(child);
-  comp.parent = parent;
-}
-
-bool SendableRegistry::Remove(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end()) return false;
-  UID compUid = it->getSecond();
-  m_impl->components.erase(compUid - 1);
-  m_impl->componentMap.erase(it);
-  // update any parent pointers
-  for (auto&& comp : m_impl->components) {
-    if (comp->parent == sendable) comp->parent = nullptr;
-  }
-  return true;
-}
-
-void SendableRegistry::Move(Sendable* to, Sendable* from) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(from);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  UID compUid = it->getSecond();
-  m_impl->componentMap.erase(it);
-  m_impl->componentMap[to] = compUid;
-  auto& comp = *m_impl->components[compUid - 1];
-  comp.sendable = to;
-  if (comp.builder.HasTable()) {
-    // rebuild builder, as lambda captures can point to "from"
-    comp.builder.ClearProperties();
-    to->InitSendable(comp.builder);
-  }
-  // update any parent pointers
-  for (auto&& comp : m_impl->components) {
-    if (comp->parent == from) comp->parent = to;
-  }
-}
-
-bool SendableRegistry::Contains(const Sendable* sendable) const {
-  std::scoped_lock lock(m_impl->mutex);
-  return m_impl->componentMap.count(sendable) != 0;
-}
-
-std::string SendableRegistry::GetName(const Sendable* sendable) const {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return std::string{};
-  return m_impl->components[it->getSecond() - 1]->name;
-}
-
-void SendableRegistry::SetName(Sendable* sendable, const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->name = name.str();
-}
-
-void SendableRegistry::SetName(Sendable* sendable, const wpi::Twine& moduleType,
-                               int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->SetName(moduleType, channel);
-}
-
-void SendableRegistry::SetName(Sendable* sendable, const wpi::Twine& moduleType,
-                               int moduleNumber, int channel) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->SetName(moduleType, moduleNumber,
-                                                   channel);
-}
-
-void SendableRegistry::SetName(Sendable* sendable, const wpi::Twine& subsystem,
-                               const wpi::Twine& name) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  auto& comp = *m_impl->components[it->getSecond() - 1];
-  comp.name = name.str();
-  comp.subsystem = subsystem.str();
-}
-
-std::string SendableRegistry::GetSubsystem(const Sendable* sendable) const {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return std::string{};
-  return m_impl->components[it->getSecond() - 1]->subsystem;
-}
-
-void SendableRegistry::SetSubsystem(Sendable* sendable,
-                                    const wpi::Twine& subsystem) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->subsystem = subsystem.str();
-}
-
-int SendableRegistry::GetDataHandle() {
-  std::scoped_lock lock(m_impl->mutex);
-  return m_impl->nextDataHandle++;
-}
-
-std::shared_ptr<void> SendableRegistry::SetData(Sendable* sendable, int handle,
-                                                std::shared_ptr<void> data) {
-  assert(handle >= 0);
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return nullptr;
-  auto& comp = *m_impl->components[it->getSecond() - 1];
-  std::shared_ptr<void> rv;
-  if (static_cast<size_t>(handle) < comp.data.size())
-    rv = std::move(comp.data[handle]);
-  else
-    comp.data.resize(handle + 1);
-  comp.data[handle] = std::move(data);
-  return rv;
-}
-
-std::shared_ptr<void> SendableRegistry::GetData(Sendable* sendable,
-                                                int handle) {
-  assert(handle >= 0);
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return nullptr;
-  auto& comp = *m_impl->components[it->getSecond() - 1];
-  if (static_cast<size_t>(handle) >= comp.data.size()) return nullptr;
-  return comp.data[handle];
-}
-
-void SendableRegistry::EnableLiveWindow(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->liveWindow = true;
-}
-
-void SendableRegistry::DisableLiveWindow(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  auto it = m_impl->componentMap.find(sendable);
-  if (it == m_impl->componentMap.end() ||
-      !m_impl->components[it->getSecond() - 1])
-    return;
-  m_impl->components[it->getSecond() - 1]->liveWindow = false;
-}
-
-SendableRegistry::UID SendableRegistry::GetUniqueId(Sendable* sendable) {
-  std::scoped_lock lock(m_impl->mutex);
-  UID uid;
-  auto& comp = m_impl->GetOrAdd(sendable, &uid);
-  comp.sendable = sendable;
-  return uid;
-}
-
-Sendable* SendableRegistry::GetSendable(UID uid) {
-  if (uid == 0) return nullptr;
-  std::scoped_lock lock(m_impl->mutex);
-  if ((uid - 1) >= m_impl->components.size() || !m_impl->components[uid - 1])
-    return nullptr;
-  return m_impl->components[uid - 1]->sendable;
-}
-
-void SendableRegistry::Publish(UID sendableUid,
-                               std::shared_ptr<NetworkTable> table) {
-  std::scoped_lock lock(m_impl->mutex);
-  if (sendableUid == 0 || (sendableUid - 1) >= m_impl->components.size() ||
-      !m_impl->components[sendableUid - 1])
-    return;
-  auto& comp = *m_impl->components[sendableUid - 1];
-  comp.builder = SendableBuilderImpl{};  // clear any current builder
-  comp.builder.SetTable(table);
-  comp.sendable->InitSendable(comp.builder);
-  comp.builder.UpdateTable();
-  comp.builder.StartListeners();
-}
-
-void SendableRegistry::Update(UID sendableUid) {
-  if (sendableUid == 0) return;
-  std::scoped_lock lock(m_impl->mutex);
-  if ((sendableUid - 1) >= m_impl->components.size() ||
-      !m_impl->components[sendableUid - 1])
-    return;
-  m_impl->components[sendableUid - 1]->builder.UpdateTable();
-}
-
-void SendableRegistry::ForeachLiveWindow(
-    int dataHandle,
-    wpi::function_ref<void(CallbackData& data)> callback) const {
-  assert(dataHandle >= 0);
-  std::scoped_lock lock(m_impl->mutex);
-  wpi::SmallVector<Impl::Component*, 128> components;
-  for (auto&& comp : m_impl->components) components.emplace_back(comp.get());
-  for (auto comp : components) {
-    if (comp && comp->sendable && comp->liveWindow) {
-      if (static_cast<size_t>(dataHandle) >= comp->data.size())
-        comp->data.resize(dataHandle + 1);
-      CallbackData cbdata{comp->sendable,         comp->name,
-                          comp->subsystem,        comp->parent,
-                          comp->data[dataHandle], comp->builder};
-      callback(cbdata);
-    }
-  }
-}
-
-SendableRegistry::SendableRegistry() : m_impl(new Impl) {}
diff --git a/wpilibc/src/main/native/cpp/smartdashboard/SmartDashboard.cpp b/wpilibc/src/main/native/cpp/smartdashboard/SmartDashboard.cpp
index 5e70a4c..25bb61f 100644
--- a/wpilibc/src/main/native/cpp/smartdashboard/SmartDashboard.cpp
+++ b/wpilibc/src/main/native/cpp/smartdashboard/SmartDashboard.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/smartdashboard/SmartDashboard.h"
 
@@ -12,252 +9,239 @@
 #include <networktables/NetworkTableInstance.h>
 #include <wpi/StringMap.h>
 #include <wpi/mutex.h>
+#include <wpi/sendable/SendableRegistry.h>
 
-#include "frc/WPIErrors.h"
-#include "frc/smartdashboard/SendableRegistry.h"
+#include "frc/Errors.h"
+#include "frc/smartdashboard/ListenerExecutor.h"
+#include "frc/smartdashboard/SendableBuilderImpl.h"
 
 using namespace frc;
 
 namespace {
-class Singleton {
- public:
-  static Singleton& GetInstance();
-
-  std::shared_ptr<nt::NetworkTable> table;
-  wpi::StringMap<SendableRegistry::UID> tablesToData;
+struct Instance {
+  detail::ListenerExecutor listenerExecutor;
+  std::shared_ptr<nt::NetworkTable> table =
+      nt::NetworkTableInstance::GetDefault().GetTable("SmartDashboard");
+  wpi::StringMap<wpi::SendableRegistry::UID> tablesToData;
   wpi::mutex tablesToDataMutex;
-
- private:
-  Singleton() {
-    table = nt::NetworkTableInstance::GetDefault().GetTable("SmartDashboard");
-    HAL_Report(HALUsageReporting::kResourceType_SmartDashboard, 0);
-  }
-  Singleton(const Singleton&) = delete;
-  Singleton& operator=(const Singleton&) = delete;
 };
-
 }  // namespace
 
-Singleton& Singleton::GetInstance() {
-  static Singleton instance;
+static Instance& GetInstance() {
+  HAL_Report(HALUsageReporting::kResourceType_SmartDashboard, 0);
+  static Instance instance;
   return instance;
 }
 
-void SmartDashboard::init() { Singleton::GetInstance(); }
+void SmartDashboard::init() {
+  GetInstance();
+}
 
-bool SmartDashboard::ContainsKey(wpi::StringRef key) {
-  return Singleton::GetInstance().table->ContainsKey(key);
+bool SmartDashboard::ContainsKey(std::string_view key) {
+  return GetInstance().table->ContainsKey(key);
 }
 
 std::vector<std::string> SmartDashboard::GetKeys(int types) {
-  return Singleton::GetInstance().table->GetKeys(types);
+  return GetInstance().table->GetKeys(types);
 }
 
-void SmartDashboard::SetPersistent(wpi::StringRef key) {
-  Singleton::GetInstance().table->GetEntry(key).SetPersistent();
+void SmartDashboard::SetPersistent(std::string_view key) {
+  GetInstance().table->GetEntry(key).SetPersistent();
 }
 
-void SmartDashboard::ClearPersistent(wpi::StringRef key) {
-  Singleton::GetInstance().table->GetEntry(key).ClearPersistent();
+void SmartDashboard::ClearPersistent(std::string_view key) {
+  GetInstance().table->GetEntry(key).ClearPersistent();
 }
 
-bool SmartDashboard::IsPersistent(wpi::StringRef key) {
-  return Singleton::GetInstance().table->GetEntry(key).IsPersistent();
+bool SmartDashboard::IsPersistent(std::string_view key) {
+  return GetInstance().table->GetEntry(key).IsPersistent();
 }
 
-void SmartDashboard::SetFlags(wpi::StringRef key, unsigned int flags) {
-  Singleton::GetInstance().table->GetEntry(key).SetFlags(flags);
+void SmartDashboard::SetFlags(std::string_view key, unsigned int flags) {
+  GetInstance().table->GetEntry(key).SetFlags(flags);
 }
 
-void SmartDashboard::ClearFlags(wpi::StringRef key, unsigned int flags) {
-  Singleton::GetInstance().table->GetEntry(key).ClearFlags(flags);
+void SmartDashboard::ClearFlags(std::string_view key, unsigned int flags) {
+  GetInstance().table->GetEntry(key).ClearFlags(flags);
 }
 
-unsigned int SmartDashboard::GetFlags(wpi::StringRef key) {
-  return Singleton::GetInstance().table->GetEntry(key).GetFlags();
+unsigned int SmartDashboard::GetFlags(std::string_view key) {
+  return GetInstance().table->GetEntry(key).GetFlags();
 }
 
-void SmartDashboard::Delete(wpi::StringRef key) {
-  Singleton::GetInstance().table->Delete(key);
+void SmartDashboard::Delete(std::string_view key) {
+  GetInstance().table->Delete(key);
 }
 
-nt::NetworkTableEntry SmartDashboard::GetEntry(wpi::StringRef key) {
-  return Singleton::GetInstance().table->GetEntry(key);
+nt::NetworkTableEntry SmartDashboard::GetEntry(std::string_view key) {
+  return GetInstance().table->GetEntry(key);
 }
 
-void SmartDashboard::PutData(wpi::StringRef key, Sendable* data) {
-  if (data == nullptr) {
-    wpi_setGlobalWPIErrorWithContext(NullParameter, "value");
-    return;
+void SmartDashboard::PutData(std::string_view key, wpi::Sendable* data) {
+  if (!data) {
+    throw FRC_MakeError(err::NullParameter, "{}", "value");
   }
-  auto& inst = Singleton::GetInstance();
+  auto& inst = GetInstance();
   std::scoped_lock lock(inst.tablesToDataMutex);
   auto& uid = inst.tablesToData[key];
-  auto& registry = SendableRegistry::GetInstance();
-  Sendable* sddata = registry.GetSendable(uid);
+  wpi::Sendable* sddata = wpi::SendableRegistry::GetSendable(uid);
   if (sddata != data) {
-    uid = registry.GetUniqueId(data);
+    uid = wpi::SendableRegistry::GetUniqueId(data);
     auto dataTable = inst.table->GetSubTable(key);
-    registry.Publish(uid, dataTable);
+    auto builder = std::make_unique<SendableBuilderImpl>();
+    auto builderPtr = builder.get();
+    builderPtr->SetTable(dataTable);
+    wpi::SendableRegistry::Publish(uid, std::move(builder));
+    builderPtr->StartListeners();
     dataTable->GetEntry(".name").SetString(key);
   }
 }
 
-void SmartDashboard::PutData(Sendable* value) {
-  if (value == nullptr) {
-    wpi_setGlobalWPIErrorWithContext(NullParameter, "value");
-    return;
+void SmartDashboard::PutData(wpi::Sendable* value) {
+  if (!value) {
+    throw FRC_MakeError(err::NullParameter, "{}", "value");
   }
-  auto name = SendableRegistry::GetInstance().GetName(value);
-  if (!name.empty()) PutData(name, value);
+  auto name = wpi::SendableRegistry::GetName(value);
+  if (!name.empty()) {
+    PutData(name, value);
+  }
 }
 
-Sendable* SmartDashboard::GetData(wpi::StringRef key) {
-  auto& inst = Singleton::GetInstance();
+wpi::Sendable* SmartDashboard::GetData(std::string_view key) {
+  auto& inst = GetInstance();
   std::scoped_lock lock(inst.tablesToDataMutex);
   auto it = inst.tablesToData.find(key);
   if (it == inst.tablesToData.end()) {
-    wpi_setGlobalWPIErrorWithContext(SmartDashboardMissingKey, key);
-    return nullptr;
+    throw FRC_MakeError(err::SmartDashboardMissingKey, "{}", key);
   }
-  return SendableRegistry::GetInstance().GetSendable(it->getValue());
+  return wpi::SendableRegistry::GetSendable(it->getValue());
 }
 
-bool SmartDashboard::PutBoolean(wpi::StringRef keyName, bool value) {
-  return Singleton::GetInstance().table->GetEntry(keyName).SetBoolean(value);
+bool SmartDashboard::PutBoolean(std::string_view keyName, bool value) {
+  return GetInstance().table->GetEntry(keyName).SetBoolean(value);
 }
 
-bool SmartDashboard::SetDefaultBoolean(wpi::StringRef key, bool defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultBoolean(
-      defaultValue);
+bool SmartDashboard::SetDefaultBoolean(std::string_view key,
+                                       bool defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultBoolean(defaultValue);
 }
 
-bool SmartDashboard::GetBoolean(wpi::StringRef keyName, bool defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(keyName).GetBoolean(
-      defaultValue);
+bool SmartDashboard::GetBoolean(std::string_view keyName, bool defaultValue) {
+  return GetInstance().table->GetEntry(keyName).GetBoolean(defaultValue);
 }
 
-bool SmartDashboard::PutNumber(wpi::StringRef keyName, double value) {
-  return Singleton::GetInstance().table->GetEntry(keyName).SetDouble(value);
+bool SmartDashboard::PutNumber(std::string_view keyName, double value) {
+  return GetInstance().table->GetEntry(keyName).SetDouble(value);
 }
 
-bool SmartDashboard::SetDefaultNumber(wpi::StringRef key, double defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultDouble(
-      defaultValue);
+bool SmartDashboard::SetDefaultNumber(std::string_view key,
+                                      double defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultDouble(defaultValue);
 }
 
-double SmartDashboard::GetNumber(wpi::StringRef keyName, double defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(keyName).GetDouble(
-      defaultValue);
+double SmartDashboard::GetNumber(std::string_view keyName,
+                                 double defaultValue) {
+  return GetInstance().table->GetEntry(keyName).GetDouble(defaultValue);
 }
 
-bool SmartDashboard::PutString(wpi::StringRef keyName, wpi::StringRef value) {
-  return Singleton::GetInstance().table->GetEntry(keyName).SetString(value);
+bool SmartDashboard::PutString(std::string_view keyName,
+                               std::string_view value) {
+  return GetInstance().table->GetEntry(keyName).SetString(value);
 }
 
-bool SmartDashboard::SetDefaultString(wpi::StringRef key,
-                                      wpi::StringRef defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultString(
-      defaultValue);
+bool SmartDashboard::SetDefaultString(std::string_view key,
+                                      std::string_view defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultString(defaultValue);
 }
 
-std::string SmartDashboard::GetString(wpi::StringRef keyName,
-                                      wpi::StringRef defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(keyName).GetString(
-      defaultValue);
+std::string SmartDashboard::GetString(std::string_view keyName,
+                                      std::string_view defaultValue) {
+  return GetInstance().table->GetEntry(keyName).GetString(defaultValue);
 }
 
-bool SmartDashboard::PutBooleanArray(wpi::StringRef key,
-                                     wpi::ArrayRef<int> value) {
-  return Singleton::GetInstance().table->GetEntry(key).SetBooleanArray(value);
+bool SmartDashboard::PutBooleanArray(std::string_view key,
+                                     wpi::span<const int> value) {
+  return GetInstance().table->GetEntry(key).SetBooleanArray(value);
 }
 
-bool SmartDashboard::SetDefaultBooleanArray(wpi::StringRef key,
-                                            wpi::ArrayRef<int> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultBooleanArray(
+bool SmartDashboard::SetDefaultBooleanArray(std::string_view key,
+                                            wpi::span<const int> defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultBooleanArray(
       defaultValue);
 }
 
 std::vector<int> SmartDashboard::GetBooleanArray(
-    wpi::StringRef key, wpi::ArrayRef<int> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).GetBooleanArray(
-      defaultValue);
+    std::string_view key, wpi::span<const int> defaultValue) {
+  return GetInstance().table->GetEntry(key).GetBooleanArray(defaultValue);
 }
 
-bool SmartDashboard::PutNumberArray(wpi::StringRef key,
-                                    wpi::ArrayRef<double> value) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDoubleArray(value);
+bool SmartDashboard::PutNumberArray(std::string_view key,
+                                    wpi::span<const double> value) {
+  return GetInstance().table->GetEntry(key).SetDoubleArray(value);
 }
 
-bool SmartDashboard::SetDefaultNumberArray(wpi::StringRef key,
-                                           wpi::ArrayRef<double> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultDoubleArray(
-      defaultValue);
+bool SmartDashboard::SetDefaultNumberArray(
+    std::string_view key, wpi::span<const double> defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultDoubleArray(defaultValue);
 }
 
 std::vector<double> SmartDashboard::GetNumberArray(
-    wpi::StringRef key, wpi::ArrayRef<double> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).GetDoubleArray(
-      defaultValue);
+    std::string_view key, wpi::span<const double> defaultValue) {
+  return GetInstance().table->GetEntry(key).GetDoubleArray(defaultValue);
 }
 
-bool SmartDashboard::PutStringArray(wpi::StringRef key,
-                                    wpi::ArrayRef<std::string> value) {
-  return Singleton::GetInstance().table->GetEntry(key).SetStringArray(value);
+bool SmartDashboard::PutStringArray(std::string_view key,
+                                    wpi::span<const std::string> value) {
+  return GetInstance().table->GetEntry(key).SetStringArray(value);
 }
 
 bool SmartDashboard::SetDefaultStringArray(
-    wpi::StringRef key, wpi::ArrayRef<std::string> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultStringArray(
-      defaultValue);
+    std::string_view key, wpi::span<const std::string> defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultStringArray(defaultValue);
 }
 
 std::vector<std::string> SmartDashboard::GetStringArray(
-    wpi::StringRef key, wpi::ArrayRef<std::string> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).GetStringArray(
-      defaultValue);
+    std::string_view key, wpi::span<const std::string> defaultValue) {
+  return GetInstance().table->GetEntry(key).GetStringArray(defaultValue);
 }
 
-bool SmartDashboard::PutRaw(wpi::StringRef key, wpi::StringRef value) {
-  return Singleton::GetInstance().table->GetEntry(key).SetRaw(value);
+bool SmartDashboard::PutRaw(std::string_view key, std::string_view value) {
+  return GetInstance().table->GetEntry(key).SetRaw(value);
 }
 
-bool SmartDashboard::SetDefaultRaw(wpi::StringRef key,
-                                   wpi::StringRef defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultRaw(
-      defaultValue);
+bool SmartDashboard::SetDefaultRaw(std::string_view key,
+                                   std::string_view defaultValue) {
+  return GetInstance().table->GetEntry(key).SetDefaultRaw(defaultValue);
 }
 
-std::string SmartDashboard::GetRaw(wpi::StringRef key,
-                                   wpi::StringRef defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).GetRaw(defaultValue);
+std::string SmartDashboard::GetRaw(std::string_view key,
+                                   std::string_view defaultValue) {
+  return GetInstance().table->GetEntry(key).GetRaw(defaultValue);
 }
 
-bool SmartDashboard::PutValue(wpi::StringRef keyName,
+bool SmartDashboard::PutValue(std::string_view keyName,
                               std::shared_ptr<nt::Value> value) {
-  return Singleton::GetInstance().table->GetEntry(keyName).SetValue(value);
+  return GetInstance().table->GetEntry(keyName).SetValue(value);
 }
 
-bool SmartDashboard::SetDefaultValue(wpi::StringRef key,
+bool SmartDashboard::SetDefaultValue(std::string_view key,
                                      std::shared_ptr<nt::Value> defaultValue) {
-  return Singleton::GetInstance().table->GetEntry(key).SetDefaultValue(
-      defaultValue);
+  return GetInstance().table->GetEntry(key).SetDefaultValue(defaultValue);
 }
 
-std::shared_ptr<nt::Value> SmartDashboard::GetValue(wpi::StringRef keyName) {
-  return Singleton::GetInstance().table->GetEntry(keyName).GetValue();
+std::shared_ptr<nt::Value> SmartDashboard::GetValue(std::string_view keyName) {
+  return GetInstance().table->GetEntry(keyName).GetValue();
 }
 
-detail::ListenerExecutor SmartDashboard::listenerExecutor;
-
 void SmartDashboard::PostListenerTask(std::function<void()> task) {
-  listenerExecutor.Execute(task);
+  GetInstance().listenerExecutor.Execute(task);
 }
 
 void SmartDashboard::UpdateValues() {
-  auto& registry = SendableRegistry::GetInstance();
-  auto& inst = Singleton::GetInstance();
+  auto& inst = GetInstance();
+  inst.listenerExecutor.RunListenerTasks();
   std::scoped_lock lock(inst.tablesToDataMutex);
-  for (auto& i : inst.tablesToData) registry.Update(i.getValue());
-  listenerExecutor.RunListenerTasks();
+  for (auto& i : inst.tablesToData) {
+    wpi::SendableRegistry::Update(i.getValue());
+  }
 }
diff --git a/wpilibc/src/main/native/cppcs/RobotBase.cpp b/wpilibc/src/main/native/cppcs/RobotBase.cpp
index 5f34e77..78c286c 100644
--- a/wpilibc/src/main/native/cppcs/RobotBase.cpp
+++ b/wpilibc/src/main/native/cppcs/RobotBase.cpp
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #include "frc/RobotBase.h"
 
@@ -14,6 +11,7 @@
 #include <cstdio>
 
 #include <cameraserver/CameraServerShared.h>
+#include <fmt/format.h>
 #include <hal/FRCUsageReporting.h>
 #include <hal/HALBase.h>
 #include <networktables/NetworkTableInstance.h>
@@ -21,24 +19,37 @@
 
 #include "WPILibVersion.h"
 #include "frc/DriverStation.h"
+#include "frc/Errors.h"
+#include "frc/Notifier.h"
 #include "frc/RobotState.h"
-#include "frc/Utility.h"
-#include "frc/WPIErrors.h"
 #include "frc/livewindow/LiveWindow.h"
 #include "frc/smartdashboard/SmartDashboard.h"
 
-typedef void (*SetCameraServerSharedFP)(frc::CameraServerShared* shared);
+static_assert(frc::RuntimeType::kRoboRIO ==
+              static_cast<frc::RuntimeType>(HAL_Runtime_RoboRIO));
+static_assert(frc::RuntimeType::kRoboRIO2 ==
+              static_cast<frc::RuntimeType>(HAL_Runtime_RoboRIO2));
+static_assert(frc::RuntimeType::kSimulation ==
+              static_cast<frc::RuntimeType>(HAL_Runtime_Simulation));
+
+using SetCameraServerSharedFP = void (*)(frc::CameraServerShared*);
 
 using namespace frc;
 
 int frc::RunHALInitialization() {
   if (!HAL_Initialize(500, 0)) {
-    wpi::errs() << "FATAL ERROR: HAL could not be initialized\n";
+    std::puts("FATAL ERROR: HAL could not be initialized");
     return -1;
   }
   HAL_Report(HALUsageReporting::kResourceType_Language,
              HALUsageReporting::kLanguage_CPlusPlus, 0, GetWPILibVersion());
-  wpi::outs() << "\n********** Robot program starting **********\n";
+
+  if (!frc::Notifier::SetHALThreadPriority(true, 40)) {
+    FRC_ReportError(warn::Warning, "{}",
+                    "Setting HAL Notifier RT priority to 40 failed\n");
+  }
+
+  std::puts("\n********** Robot program starting **********");
   return 0;
 }
 
@@ -56,14 +67,18 @@
   void ReportVideoServer(int id) override {
     HAL_Report(HALUsageReporting::kResourceType_PCVideoServer, id);
   }
-  void SetCameraServerError(const wpi::Twine& error) override {
-    wpi_setGlobalWPIErrorWithContext(CameraServerError, error);
+  void SetCameraServerErrorV(fmt::string_view format,
+                             fmt::format_args args) override {
+    ReportErrorV(err::CameraServerError, __FILE__, __LINE__, __FUNCTION__,
+                 format, args);
   }
-  void SetVisionRunnerError(const wpi::Twine& error) override {
-    wpi_setGlobalErrorWithContext(-1, error);
+  void SetVisionRunnerErrorV(fmt::string_view format,
+                             fmt::format_args args) override {
+    ReportErrorV(err::Error, __FILE__, __LINE__, __FUNCTION__, format, args);
   }
-  void ReportDriverStationError(const wpi::Twine& error) override {
-    DriverStation::ReportError(error);
+  void ReportDriverStationErrorV(fmt::string_view format,
+                                 fmt::format_args args) override {
+    ReportErrorV(err::Error, __FILE__, __LINE__, __FUNCTION__, format, args);
   }
   std::pair<std::thread::id, bool> GetRobotMainThreadId() const override {
     return std::make_pair(RobotBase::GetThreadId(), true);
@@ -71,8 +86,14 @@
 };
 class WPILibMathShared : public wpi::math::MathShared {
  public:
-  void ReportError(const wpi::Twine& error) override {
-    DriverStation::ReportError(error);
+  void ReportErrorV(fmt::string_view format, fmt::format_args args) override {
+    frc::ReportErrorV(err::Error, __FILE__, __LINE__, __FUNCTION__, format,
+                      args);
+  }
+
+  void ReportWarningV(fmt::string_view format, fmt::format_args args) override {
+    frc::ReportErrorV(warn::Warning, __FILE__, __LINE__, __FUNCTION__, format,
+                      args);
   }
 
   void ReportUsage(wpi::math::MathUsageId id, int count) override {
@@ -107,6 +128,13 @@
         HAL_Report(HALUsageReporting::kResourceType_Odometry,
                    HALUsageReporting::kOdometry_MecanumDrive);
         break;
+      case wpi::math::MathUsageId::kController_PIDController2:
+        HAL_Report(HALUsageReporting::kResourceType_PIDController2, count);
+        break;
+      case wpi::math::MathUsageId::kController_ProfiledPIDController:
+        HAL_Report(HALUsageReporting::kResourceType_ProfiledPIDController,
+                   count);
+        break;
     }
   }
 };
@@ -122,8 +150,8 @@
 #endif
 
   if (!cameraServerLib) {
-    wpi::outs() << "Camera Server Library Not Found\n";
-    wpi::outs().flush();
+    std::puts("Camera Server Library Not Found");
+    std::fflush(stdout);
     return;
   }
   auto symbol = dlsym(cameraServerLib, "CameraServer_SetCameraServerShared");
@@ -131,15 +159,15 @@
     auto setCameraServerShared = (SetCameraServerSharedFP)symbol;
     setCameraServerShared(new WPILibCameraServerShared{});
   } else {
-    wpi::outs() << "Camera Server Shared Symbol Missing\n";
-    wpi::outs().flush();
+    std::puts("Camera Server Shared Symbol Missing");
+    std::fflush(stdout);
   }
 #else
   CameraServer_SetCameraServerShared(new WPILibCameraServerShared{});
 #endif
 #else
-  wpi::outs() << "Not loading CameraServerShared\n";
-  wpi::outs().flush();
+  std::puts("Not loading CameraServerShared");
+  std::fflush(stdout);
 #endif
 }
 
@@ -148,29 +176,55 @@
       std::make_unique<WPILibMathShared>());
 }
 
-bool RobotBase::IsEnabled() const { return m_ds.IsEnabled(); }
+bool RobotBase::IsEnabled() const {
+  return DriverStation::IsEnabled();
+}
 
-bool RobotBase::IsDisabled() const { return m_ds.IsDisabled(); }
+bool RobotBase::IsDisabled() const {
+  return DriverStation::IsDisabled();
+}
 
-bool RobotBase::IsAutonomous() const { return m_ds.IsAutonomous(); }
+bool RobotBase::IsAutonomous() const {
+  return DriverStation::IsAutonomous();
+}
 
 bool RobotBase::IsAutonomousEnabled() const {
-  return m_ds.IsAutonomousEnabled();
+  return DriverStation::IsAutonomousEnabled();
 }
 
-bool RobotBase::IsOperatorControl() const { return m_ds.IsOperatorControl(); }
+bool RobotBase::IsOperatorControl() const {
+  return DriverStation::IsTeleop();
+}
+
+bool RobotBase::IsTeleop() const {
+  return DriverStation::IsTeleop();
+}
 
 bool RobotBase::IsOperatorControlEnabled() const {
-  return m_ds.IsOperatorControlEnabled();
+  return DriverStation::IsTeleopEnabled();
 }
 
-bool RobotBase::IsTest() const { return m_ds.IsTest(); }
+bool RobotBase::IsTeleopEnabled() const {
+  return DriverStation::IsTeleopEnabled();
+}
 
-bool RobotBase::IsNewDataAvailable() const { return m_ds.IsNewControlData(); }
+bool RobotBase::IsTest() const {
+  return DriverStation::IsTest();
+}
 
-std::thread::id RobotBase::GetThreadId() { return m_threadId; }
+bool RobotBase::IsNewDataAvailable() const {
+  return DriverStation::IsNewControlData();
+}
 
-RobotBase::RobotBase() : m_ds(DriverStation::GetInstance()) {
+std::thread::id RobotBase::GetThreadId() {
+  return m_threadId;
+}
+
+RuntimeType RobotBase::GetRuntimeType() {
+  return static_cast<RuntimeType>(HAL_GetRuntimeType());
+}
+
+RobotBase::RobotBase() {
   m_threadId = std::this_thread::get_id();
 
   SetupCameraServerShared();
@@ -203,12 +257,5 @@
       ->GetEntry("LW Enabled")
       .SetBoolean(false);
 
-  LiveWindow::GetInstance()->SetEnabled(false);
+  LiveWindow::SetEnabled(false);
 }
-
-RobotBase::RobotBase(RobotBase&&) noexcept
-    : m_ds(DriverStation::GetInstance()) {}
-
-RobotBase::~RobotBase() {}
-
-RobotBase& RobotBase::operator=(RobotBase&&) noexcept { return *this; }
diff --git a/wpilibc/src/main/native/include/WPILibVersion.h b/wpilibc/src/main/native/include/WPILibVersion.h
index 8aab880..c11bef9 100644
--- a/wpilibc/src/main/native/include/WPILibVersion.h
+++ b/wpilibc/src/main/native/include/WPILibVersion.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/ADXL345_I2C.h b/wpilibc/src/main/native/include/frc/ADXL345_I2C.h
index 202acbb..c997327 100644
--- a/wpilibc/src/main/native/include/frc/ADXL345_I2C.h
+++ b/wpilibc/src/main/native/include/frc/ADXL345_I2C.h
@@ -1,24 +1,18 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/SimDevice.h>
+#include <networktables/NTSendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/ErrorBase.h"
 #include "frc/I2C.h"
 #include "frc/interfaces/Accelerometer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * ADXL345 Accelerometer on I2C.
  *
@@ -26,10 +20,9 @@
  * an I2C bus. This class assumes the default (not alternate) sensor address of
  * 0x1D (7-bit address).
  */
-class ADXL345_I2C : public ErrorBase,
-                    public Accelerometer,
-                    public Sendable,
-                    public SendableHelper<ADXL345_I2C> {
+class ADXL345_I2C : public Accelerometer,
+                    public nt::NTSendable,
+                    public wpi::SendableHelper<ADXL345_I2C> {
  public:
   enum Axes { kAxis_X = 0x00, kAxis_Y = 0x02, kAxis_Z = 0x04 };
 
@@ -53,8 +46,11 @@
   ADXL345_I2C(ADXL345_I2C&&) = default;
   ADXL345_I2C& operator=(ADXL345_I2C&&) = default;
 
+  I2C::Port GetI2CPort() const;
+  int GetI2CDeviceAddress() const;
+
   // Accelerometer interface
-  void SetRange(Range range) override;
+  void SetRange(Range range) final;
   double GetX() override;
   double GetY() override;
   double GetZ() override;
@@ -75,7 +71,7 @@
    */
   virtual AllAxes GetAccelerations();
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(nt::NTSendableBuilder& builder) override;
 
  protected:
   I2C m_i2c;
diff --git a/wpilibc/src/main/native/include/frc/ADXL345_SPI.h b/wpilibc/src/main/native/include/frc/ADXL345_SPI.h
index 90454c0..18d48a3 100644
--- a/wpilibc/src/main/native/include/frc/ADXL345_SPI.h
+++ b/wpilibc/src/main/native/include/frc/ADXL345_SPI.h
@@ -1,19 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/SimDevice.h>
+#include <networktables/NTSendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/ErrorBase.h"
 #include "frc/SPI.h"
 #include "frc/interfaces/Accelerometer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
@@ -23,10 +19,9 @@
  * This class allows access to an Analog Devices ADXL345 3-axis accelerometer
  * via SPI. This class assumes the sensor is wired in 4-wire SPI mode.
  */
-class ADXL345_SPI : public ErrorBase,
-                    public Accelerometer,
-                    public Sendable,
-                    public SendableHelper<ADXL345_SPI> {
+class ADXL345_SPI : public Accelerometer,
+                    public nt::NTSendable,
+                    public wpi::SendableHelper<ADXL345_SPI> {
  public:
   enum Axes { kAxis_X = 0x00, kAxis_Y = 0x02, kAxis_Z = 0x04 };
 
@@ -49,8 +44,10 @@
   ADXL345_SPI(ADXL345_SPI&&) = default;
   ADXL345_SPI& operator=(ADXL345_SPI&&) = default;
 
+  SPI::Port GetSpiPort() const;
+
   // Accelerometer interface
-  void SetRange(Range range) override;
+  void SetRange(Range range) final;
   double GetX() override;
   double GetY() override;
   double GetZ() override;
@@ -71,7 +68,7 @@
    */
   virtual AllAxes GetAccelerations();
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(nt::NTSendableBuilder& builder) override;
 
  protected:
   SPI m_spi;
diff --git a/wpilibc/src/main/native/include/frc/ADXL362.h b/wpilibc/src/main/native/include/frc/ADXL362.h
index e1d659b..451b5fb 100644
--- a/wpilibc/src/main/native/include/frc/ADXL362.h
+++ b/wpilibc/src/main/native/include/frc/ADXL362.h
@@ -1,33 +1,26 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/SimDevice.h>
+#include <networktables/NTSendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/ErrorBase.h"
 #include "frc/SPI.h"
 #include "frc/interfaces/Accelerometer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * ADXL362 SPI Accelerometer.
  *
  * This class allows access to an Analog Devices ADXL362 3-axis accelerometer.
  */
-class ADXL362 : public ErrorBase,
-                public Accelerometer,
-                public Sendable,
-                public SendableHelper<ADXL362> {
+class ADXL362 : public Accelerometer,
+                public nt::NTSendable,
+                public wpi::SendableHelper<ADXL362> {
  public:
   enum Axes { kAxis_X = 0x00, kAxis_Y = 0x02, kAxis_Z = 0x04 };
   struct AllAxes {
@@ -57,8 +50,10 @@
   ADXL362(ADXL362&&) = default;
   ADXL362& operator=(ADXL362&&) = default;
 
+  SPI::Port GetSpiPort() const;
+
   // Accelerometer interface
-  void SetRange(Range range) override;
+  void SetRange(Range range) final;
   double GetX() override;
   double GetY() override;
   double GetZ() override;
@@ -79,7 +74,7 @@
    */
   virtual AllAxes GetAccelerations();
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(nt::NTSendableBuilder& builder) override;
 
  private:
   SPI m_spi;
diff --git a/wpilibc/src/main/native/include/frc/ADXRS450_Gyro.h b/wpilibc/src/main/native/include/frc/ADXRS450_Gyro.h
index 309fab3..cb0dff8 100644
--- a/wpilibc/src/main/native/include/frc/ADXRS450_Gyro.h
+++ b/wpilibc/src/main/native/include/frc/ADXRS450_Gyro.h
@@ -1,25 +1,24 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <stdint.h>
 
 #include <hal/SimDevice.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/GyroBase.h"
 #include "frc/SPI.h"
+#include "frc/interfaces/Gyro.h"
 
 namespace frc {
 
 /**
  * Use a rate gyro to return the robots heading relative to a starting position.
  *
- * The Gyro class tracks the robots heading based on the starting position. As
+ * The %Gyro class tracks the robots heading based on the starting position. As
  * the robot rotates the new heading is computed by integrating the rate of
  * rotation returned by the sensor. When the class is instantiated, it does a
  * short calibration routine where it samples the gyro while at rest to
@@ -27,17 +26,19 @@
  * determine the heading.
  *
  * This class is for the digital ADXRS450 gyro sensor that connects via SPI.
- * Only one instance of an ADXRS Gyro is supported.
+ * Only one instance of an ADXRS %Gyro is supported.
  */
-class ADXRS450_Gyro : public GyroBase {
+class ADXRS450_Gyro : public Gyro,
+                      public wpi::Sendable,
+                      public wpi::SendableHelper<ADXRS450_Gyro> {
  public:
   /**
-   * Gyro constructor on onboard CS0.
+   * %Gyro constructor on onboard CS0.
    */
   ADXRS450_Gyro();
 
   /**
-   * Gyro constructor on the specified SPI port.
+   * %Gyro constructor on the specified SPI port.
    *
    * @param port The SPI port the gyro is attached to.
    */
@@ -90,7 +91,7 @@
    * robot is first turned on while it's sitting at rest before the competition
    * starts.
    */
-  void Calibrate() override;
+  void Calibrate() final;
 
   /**
    * Get the SPI port number.
@@ -99,6 +100,8 @@
    */
   int GetPort() const;
 
+  void InitSendable(wpi::SendableBuilder& builder) override;
+
  private:
   SPI m_spi;
   SPI::Port m_port;
diff --git a/wpilibc/src/main/native/include/frc/AddressableLED.h b/wpilibc/src/main/native/include/frc/AddressableLED.h
index 3bcbab5..561eb37 100644
--- a/wpilibc/src/main/native/include/frc/AddressableLED.h
+++ b/wpilibc/src/main/native/include/frc/AddressableLED.h
@@ -1,20 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <memory>
+#include <initializer_list>
 
 #include <hal/AddressableLEDTypes.h>
 #include <hal/Types.h>
 #include <units/time.h>
-#include <wpi/ArrayRef.h>
+#include <wpi/span.h>
 
-#include "frc/ErrorBase.h"
 #include "util/Color.h"
 #include "util/Color8Bit.h"
 
@@ -25,7 +21,7 @@
  *
  * <p>Only 1 LED driver is currently supported by the roboRIO.
  */
-class AddressableLED : public ErrorBase {
+class AddressableLED {
  public:
   class LEDData : public HAL_AddressableLEDData {
    public:
@@ -89,7 +85,7 @@
    */
   explicit AddressableLED(int port);
 
-  ~AddressableLED() override;
+  ~AddressableLED();
 
   /**
    * Sets the length of the LED strip.
@@ -111,7 +107,7 @@
    *
    * @param ledData the buffer to write
    */
-  void SetData(wpi::ArrayRef<LEDData> ledData);
+  void SetData(wpi::span<const LEDData> ledData);
 
   /**
    * Sets the led output data.
@@ -144,7 +140,7 @@
    * <p>The sync time is the time to hold output so LEDs enable. Default set for
    * WS2812.
    *
-   * @param syncTimeMicroSeconds the sync time
+   * @param syncTime the sync time
    */
   void SetSyncTime(units::microsecond_t syncTime);
 
@@ -163,5 +159,6 @@
  private:
   hal::Handle<HAL_DigitalHandle> m_pwmHandle;
   hal::Handle<HAL_AddressableLEDHandle> m_handle;
+  int m_port;
 };
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/AnalogAccelerometer.h b/wpilibc/src/main/native/include/frc/AnalogAccelerometer.h
index 27015e4..b14ff7c 100644
--- a/wpilibc/src/main/native/include/frc/AnalogAccelerometer.h
+++ b/wpilibc/src/main/native/include/frc/AnalogAccelerometer.h
@@ -1,24 +1,18 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/AnalogInput.h"
-#include "frc/ErrorBase.h"
-#include "frc/PIDSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Handle operation of an analog accelerometer.
  *
@@ -26,10 +20,8 @@
  * sensors have multiple axis and can be treated as multiple devices. Each is
  * calibrated by finding the center value over a period of time.
  */
-class AnalogAccelerometer : public ErrorBase,
-                            public PIDSource,
-                            public Sendable,
-                            public SendableHelper<AnalogAccelerometer> {
+class AnalogAccelerometer : public wpi::Sendable,
+                            public wpi::SendableHelper<AnalogAccelerometer> {
  public:
   /**
    * Create a new instance of an accelerometer.
@@ -100,14 +92,7 @@
    */
   void SetZero(double zero);
 
-  /**
-   * Get the Acceleration for the PID Source parent.
-   *
-   * @return The current acceleration in Gs.
-   */
-  double PIDGet() override;
-
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   /**
diff --git a/wpilibc/src/main/native/include/frc/AnalogEncoder.h b/wpilibc/src/main/native/include/frc/AnalogEncoder.h
index 3dc22ea..6f12cb8 100644
--- a/wpilibc/src/main/native/include/frc/AnalogEncoder.h
+++ b/wpilibc/src/main/native/include/frc/AnalogEncoder.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -12,12 +9,11 @@
 #include <hal/SimDevice.h>
 #include <hal/Types.h>
 #include <units/angle.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/AnalogTrigger.h"
 #include "frc/Counter.h"
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 class AnalogInput;
@@ -25,11 +21,17 @@
 /**
  * Class for supporting continuous analog encoders, such as the US Digital MA3.
  */
-class AnalogEncoder : public ErrorBase,
-                      public Sendable,
-                      public SendableHelper<AnalogEncoder> {
+class AnalogEncoder : public wpi::Sendable,
+                      public wpi::SendableHelper<AnalogEncoder> {
  public:
   /**
+   * Construct a new AnalogEncoder attached to a specific AnalogIn channel.
+   *
+   * @param channel the analog input channel to attach to
+   */
+  explicit AnalogEncoder(int channel);
+
+  /**
    * Construct a new AnalogEncoder attached to a specific AnalogInput.
    *
    * @param analogInput the analog input to attach to
@@ -115,7 +117,7 @@
    */
   int GetChannel() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   void Init();
diff --git a/wpilibc/src/main/native/include/frc/AnalogGyro.h b/wpilibc/src/main/native/include/frc/AnalogGyro.h
index b59df5b..6565c93 100644
--- a/wpilibc/src/main/native/include/frc/AnalogGyro.h
+++ b/wpilibc/src/main/native/include/frc/AnalogGyro.h
@@ -1,19 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
 #include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/GyroBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include "frc/interfaces/Gyro.h"
 
 namespace frc {
 
@@ -32,7 +29,9 @@
  *
  * This class is for gyro sensors that connect to an analog input.
  */
-class AnalogGyro : public GyroBase {
+class AnalogGyro : public Gyro,
+                   public wpi::Sendable,
+                   public wpi::SendableHelper<AnalogGyro> {
  public:
   static constexpr int kOversampleBits = 10;
   static constexpr int kAverageBits = 0;
@@ -41,7 +40,7 @@
   static constexpr double kDefaultVoltsPerDegreePerSecond = 0.007;
 
   /**
-   * Gyro constructor using the Analog Input channel number.
+   * %Gyro constructor using the Analog Input channel number.
    *
    * @param channel The analog channel the gyro is connected to. Gyros can only
    *                be used on on-board Analog Inputs 0-1.
@@ -63,7 +62,7 @@
   explicit AnalogGyro(AnalogInput* channel);
 
   /**
-   * Gyro constructor with a precreated AnalogInput object.
+   * %Gyro constructor with a precreated AnalogInput object.
    *
    * Use this constructor when the analog channel needs to be shared.
    * This object will not clean up the AnalogInput object when using this
@@ -75,7 +74,7 @@
   explicit AnalogGyro(std::shared_ptr<AnalogInput> channel);
 
   /**
-   * Gyro constructor using the Analog Input channel number with parameters for
+   * %Gyro constructor using the Analog Input channel number with parameters for
    * presetting the center and offset values. Bypasses calibration.
    *
    * @param channel The analog channel the gyro is connected to. Gyros can only
@@ -87,7 +86,7 @@
   AnalogGyro(int channel, int center, double offset);
 
   /**
-   * Gyro constructor with a precreated AnalogInput object and calibrated
+   * %Gyro constructor with a precreated AnalogInput object and calibrated
    * parameters.
    *
    * Use this constructor when the analog channel needs to be shared.
@@ -104,8 +103,8 @@
 
   ~AnalogGyro() override;
 
-  AnalogGyro(AnalogGyro&& rhs);
-  AnalogGyro& operator=(AnalogGyro&& rhs);
+  AnalogGyro(AnalogGyro&& rhs) = default;
+  AnalogGyro& operator=(AnalogGyro&& rhs) = default;
 
   /**
    * Return the actual angle in degrees that the robot is currently facing.
@@ -175,16 +174,16 @@
    * significant drift in the gyro and it needs to be recalibrated after it has
    * been running.
    */
-  void Reset() override;
+  void Reset() final;
 
   /**
    * Initialize the gyro.
    *
    * Calibration is handled by Calibrate().
    */
-  virtual void InitGyro();
+  void InitGyro();
 
-  void Calibrate() override;
+  void Calibrate() final;
 
   /**
    * Gets the analog input for the gyro.
@@ -193,6 +192,8 @@
    */
   std::shared_ptr<AnalogInput> GetAnalogInput() const;
 
+  void InitSendable(wpi::SendableBuilder& builder) override;
+
  protected:
   std::shared_ptr<AnalogInput> m_analog;
 
diff --git a/wpilibc/src/main/native/include/frc/AnalogInput.h b/wpilibc/src/main/native/include/frc/AnalogInput.h
index 3d14c4c..ebc4e70 100644
--- a/wpilibc/src/main/native/include/frc/AnalogInput.h
+++ b/wpilibc/src/main/native/include/frc/AnalogInput.h
@@ -1,24 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <stdint.h>
 
 #include <hal/Types.h>
-
-#include "frc/ErrorBase.h"
-#include "frc/PIDSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 
-class SendableBuilder;
 class DMA;
 class DMASample;
 
@@ -34,10 +27,8 @@
  * are divided by the number of samples to retain the resolution, but get more
  * stable values.
  */
-class AnalogInput : public ErrorBase,
-                    public PIDSource,
-                    public Sendable,
-                    public SendableHelper<AnalogInput> {
+class AnalogInput : public wpi::Sendable,
+                    public wpi::SendableHelper<AnalogInput> {
   friend class AnalogTrigger;
   friend class AnalogGyro;
   friend class DMA;
@@ -207,8 +198,7 @@
    *
    * This will be added to all values returned to the user.
    *
-   * @param initialValue The value that the accumulator should start from when
-   *                     reset.
+   * @param value The value that the accumulator should start from when reset.
    */
   void SetAccumulatorInitialValue(int64_t value);
 
@@ -284,20 +274,13 @@
   static double GetSampleRate();
 
   /**
-   * Get the Average value for the PID Source base object.
-   *
-   * @return The average voltage.
-   */
-  double PIDGet() override;
-
-  /**
    * Indicates this input is used by a simulated device.
    *
    * @param device simulated device handle
    */
   void SetSimDevice(HAL_SimDeviceHandle device);
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/AnalogOutput.h b/wpilibc/src/main/native/include/frc/AnalogOutput.h
index 026986b..ccb3c9c 100644
--- a/wpilibc/src/main/native/include/frc/AnalogOutput.h
+++ b/wpilibc/src/main/native/include/frc/AnalogOutput.h
@@ -1,28 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/Types.h>
-
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * MXP analog output class.
  */
-class AnalogOutput : public ErrorBase,
-                     public Sendable,
-                     public SendableHelper<AnalogOutput> {
+class AnalogOutput : public wpi::Sendable,
+                     public wpi::SendableHelper<AnalogOutput> {
  public:
   /**
    * Construct an analog output on the given channel.
@@ -57,7 +49,7 @@
    */
   int GetChannel() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  protected:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/AnalogPotentiometer.h b/wpilibc/src/main/native/include/frc/AnalogPotentiometer.h
index ed943f7..3d0588d 100644
--- a/wpilibc/src/main/native/include/frc/AnalogPotentiometer.h
+++ b/wpilibc/src/main/native/include/frc/AnalogPotentiometer.h
@@ -1,34 +1,26 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/AnalogInput.h"
-#include "frc/ErrorBase.h"
-#include "frc/interfaces/Potentiometer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Class for reading analog potentiometers. Analog potentiometers read in an
  * analog voltage that corresponds to a position. The position is in whichever
  * units you choose, by way of the scaling and offset constants passed to the
  * constructor.
  */
-class AnalogPotentiometer : public ErrorBase,
-                            public Potentiometer,
-                            public Sendable,
-                            public SendableHelper<AnalogPotentiometer> {
+class AnalogPotentiometer : public wpi::Sendable,
+                            public wpi::SendableHelper<AnalogPotentiometer> {
  public:
   /**
    * Construct an Analog Potentiometer object from a channel number.
@@ -66,7 +58,7 @@
    * This will calculate the result from the fullRange times the fraction of the
    * supply voltage, plus the offset.
    *
-   * @param channel   The existing Analog Input pointer
+   * @param input     The existing Analog Input pointer
    * @param fullRange The value (in desired units) representing the full
    *                  0-5V range of the input.
    * @param offset    The value (in desired units) representing the
@@ -88,7 +80,7 @@
    * This will calculate the result from the fullRange times the fraction of the
    * supply voltage, plus the offset.
    *
-   * @param channel   The existing Analog Input pointer
+   * @param input     The existing Analog Input pointer
    * @param fullRange The value (in desired units) representing the full
    *                  0-5V range of the input.
    * @param offset    The value (in desired units) representing the
@@ -108,16 +100,9 @@
    * @return The current position of the potentiometer (in the units used for
    *         fullRange and offset).
    */
-  double Get() const override;
+  double Get() const;
 
-  /**
-   * Implement the PIDSource interface.
-   *
-   * @return The current reading.
-   */
-  double PIDGet() override;
-
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   std::shared_ptr<AnalogInput> m_analog_input;
diff --git a/wpilibc/src/main/native/include/frc/AnalogTrigger.h b/wpilibc/src/main/native/include/frc/AnalogTrigger.h
index d465652..f9c5602 100644
--- a/wpilibc/src/main/native/include/frc/AnalogTrigger.h
+++ b/wpilibc/src/main/native/include/frc/AnalogTrigger.h
@@ -1,30 +1,24 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
 #include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/AnalogTriggerOutput.h"
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
 class AnalogInput;
 class DutyCycle;
-class SendableBuilder;
 
-class AnalogTrigger : public ErrorBase,
-                      public Sendable,
-                      public SendableHelper<AnalogTrigger> {
+class AnalogTrigger : public wpi::Sendable,
+                      public wpi::SendableHelper<AnalogTrigger> {
   friend class AnalogTriggerOutput;
 
  public:
@@ -42,21 +36,21 @@
    * This should be used in the case of sharing an analog channel between the
    * trigger and an analog input object.
    *
-   * @param channel The pointer to the existing AnalogInput object
+   * @param input The pointer to the existing AnalogInput object
    */
-  explicit AnalogTrigger(AnalogInput* channel);
+  explicit AnalogTrigger(AnalogInput* input);
 
   /**
    * Construct an analog trigger given a duty cycle input.
    *
-   * @param channel The pointer to the existing DutyCycle object
+   * @param dutyCycle The pointer to the existing DutyCycle object
    */
   explicit AnalogTrigger(DutyCycle* dutyCycle);
 
   ~AnalogTrigger() override;
 
-  AnalogTrigger(AnalogTrigger&& rhs);
-  AnalogTrigger& operator=(AnalogTrigger&& rhs);
+  AnalogTrigger(AnalogTrigger&&) = default;
+  AnalogTrigger& operator=(AnalogTrigger&&) = default;
 
   /**
    * Set the upper and lower limits of the analog trigger.
@@ -154,9 +148,11 @@
   std::shared_ptr<AnalogTriggerOutput> CreateOutput(
       AnalogTriggerType type) const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
+  int GetSourceChannel() const;
+
   hal::Handle<HAL_AnalogTriggerHandle> m_trigger;
   AnalogInput* m_analogInput = nullptr;
   DutyCycle* m_dutyCycle = nullptr;
diff --git a/wpilibc/src/main/native/include/frc/AnalogTriggerOutput.h b/wpilibc/src/main/native/include/frc/AnalogTriggerOutput.h
index 989a93f..6f52cab 100644
--- a/wpilibc/src/main/native/include/frc/AnalogTriggerOutput.h
+++ b/wpilibc/src/main/native/include/frc/AnalogTriggerOutput.h
@@ -1,15 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/DigitalSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
@@ -47,8 +45,8 @@
  * may help with this, but rotational speeds of the sensor will then be limited.
  */
 class AnalogTriggerOutput : public DigitalSource,
-                            public Sendable,
-                            public SendableHelper<AnalogTriggerOutput> {
+                            public wpi::Sendable,
+                            public wpi::SendableHelper<AnalogTriggerOutput> {
   friend class AnalogTrigger;
 
  public:
@@ -80,7 +78,7 @@
    */
   int GetChannel() const override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  protected:
   /**
diff --git a/wpilibc/src/main/native/include/frc/AnalogTriggerType.h b/wpilibc/src/main/native/include/frc/AnalogTriggerType.h
index f15fb03..c706c34 100644
--- a/wpilibc/src/main/native/include/frc/AnalogTriggerType.h
+++ b/wpilibc/src/main/native/include/frc/AnalogTriggerType.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/AsynchronousInterrupt.h b/wpilibc/src/main/native/include/frc/AsynchronousInterrupt.h
new file mode 100644
index 0000000..4531dfd
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/AsynchronousInterrupt.h
@@ -0,0 +1,177 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <frc/SynchronousInterrupt.h>
+
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <thread>
+#include <utility>
+
+#include <units/time.h>
+
+namespace frc {
+/**
+ * Class for handling asynchronous interrupts using a callback thread.
+ *
+ * <p> By default, interrupts will occur on rising edge. Callbacks are disabled
+ * by default, and Enable() must be called before they will occur.
+ *
+ * <p> Both rising and falling edges can be indicated in one callback if both a
+ * rising and falling edge occurred since the previous callback.
+ *
+ * <p>Synchronous (blocking) interrupts are handled by the SynchronousInterrupt
+ * class.
+ */
+class AsynchronousInterrupt {
+ public:
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * <p> The first bool in the callback indicates the rising edge triggered the
+   * interrupt, the second bool is falling edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param callback the callback function to call when the interrupt is
+   * triggered
+   */
+  AsynchronousInterrupt(DigitalSource& source,
+                        std::function<void(bool, bool)> callback);
+
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * <p> The first bool in the callback indicates the rising edge triggered the
+   * interrupt, the second bool is falling edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param callback the callback function to call when the interrupt is
+   * triggered
+   */
+  AsynchronousInterrupt(DigitalSource* source,
+                        std::function<void(bool, bool)> callback);
+
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * <p> The first bool in the callback indicates the rising edge triggered the
+   * interrupt, the second bool is falling edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param callback the callback function to call when the interrupt is
+   * triggered
+   */
+  AsynchronousInterrupt(std::shared_ptr<DigitalSource> source,
+                        std::function<void(bool, bool)> callback);
+
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param f the callback function to call when the interrupt is triggered
+   * @param arg the first argument, interrupt was triggered on rising edge
+   * @param args the remaing arguments, interrupt was triggered on falling edge
+   */
+  template <typename Callable, typename Arg, typename... Args>
+  AsynchronousInterrupt(DigitalSource& source, Callable&& f, Arg&& arg,
+                        Args&&... args)
+      : AsynchronousInterrupt(
+            source, std::bind(std::forward<Callable>(f), std::forward<Arg>(arg),
+                              std::forward<Args>(args)...)) {}
+
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param f the callback function to call when the interrupt is triggered
+   * @param arg the first argument, interrupt was triggered on rising edge
+   * @param args the remaing arguments, interrupt was triggered on falling edge
+   */
+  template <typename Callable, typename Arg, typename... Args>
+  AsynchronousInterrupt(DigitalSource* source, Callable&& f, Arg&& arg,
+                        Args&&... args)
+      : AsynchronousInterrupt(
+            source, std::bind(std::forward<Callable>(f), std::forward<Arg>(arg),
+                              std::forward<Args>(args)...)) {}
+
+  /**
+   * Construct an Asynchronous Interrupt from a Digital Source.
+   *
+   * <p> At construction, the interrupt will trigger on the rising edge.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   * @param f the callback function to call when the interrupt is triggered
+   * @param arg the first argument, interrupt was triggered on rising edge
+   * @param args the remaing arguments, interrupt was triggered on falling edge
+   */
+  template <typename Callable, typename Arg, typename... Args>
+  AsynchronousInterrupt(std::shared_ptr<DigitalSource> source, Callable&& f,
+                        Arg&& arg, Args&&... args)
+      : AsynchronousInterrupt(
+            source, std::bind(std::forward<Callable>(f), std::forward<Arg>(arg),
+                              std::forward<Args>(args)...)) {}
+
+  ~AsynchronousInterrupt();
+
+  /**
+   * Enables interrupt callbacks. Before this, callbacks will not occur. Does
+   * nothing if already enabled.
+   */
+  void Enable();
+
+  /**
+   * Disables interrupt callbacks. Does nothing if already disabled.
+   */
+  void Disable();
+
+  /**
+   * Set which edges to trigger the interrupt on.
+   *
+   * @param risingEdge %Trigger on rising edge
+   * @param fallingEdge %Trigger on falling edge
+   */
+  void SetInterruptEdges(bool risingEdge, bool fallingEdge);
+
+  /**
+   * Get the timestamp of the last rising edge.
+   *
+   * <p>This function does not require the interrupt to be enabled to work.
+   *
+   * <p>This only works if rising edge was configured using SetInterruptEdges.
+   * @return the timestamp in seconds relative to GetFPGATime
+   */
+  units::second_t GetRisingTimestamp();
+
+  /**
+   * Get the timestamp of the last falling edge.
+   *
+   * <p>This function does not require the interrupt to be enabled to work.
+   *
+   * <p>This only works if falling edge was configured using SetInterruptEdges.
+   * @return the timestamp in seconds relative to GetFPGATime
+   */
+  units::second_t GetFallingTimestamp();
+
+ private:
+  void ThreadMain();
+
+  std::atomic_bool m_keepRunning{false};
+  std::thread m_thread;
+  SynchronousInterrupt m_interrupt;
+  std::function<void(bool, bool)> m_callback;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Base.h b/wpilibc/src/main/native/include/frc/Base.h
deleted file mode 100644
index 1fdbe5d..0000000
--- a/wpilibc/src/main/native/include/frc/Base.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ < 5
-static_assert(0,
-              "GCC must be 5 or greater. If building for the roboRIO, please "
-              "update to the 2018 toolchains.");
-#endif
-
-#if defined(_MSC_VER) && _MSC_VER < 1900
-static_assert(0, "Visual Studio 2015 or greater required.");
-#endif
-
-/** WPILib FRC namespace */
-namespace frc {
-
-// A struct to use as a deleter when a std::shared_ptr must wrap a raw pointer
-// that is being deleted by someone else.
-template <class T>
-struct NullDeleter {
-  void operator()(T*) const noexcept {};
-};
-
-}  // namespace frc
-
-// For backwards compatibility
-#ifdef NO_NAMESPACED_WPILIB
-using namespace frc;  // NOLINT
-#endif
diff --git a/wpilibc/src/main/native/include/frc/BuiltInAccelerometer.h b/wpilibc/src/main/native/include/frc/BuiltInAccelerometer.h
index 8148e72..0e5bee6 100644
--- a/wpilibc/src/main/native/include/frc/BuiltInAccelerometer.h
+++ b/wpilibc/src/main/native/include/frc/BuiltInAccelerometer.h
@@ -1,30 +1,24 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/ErrorBase.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/interfaces/Accelerometer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Built-in accelerometer.
  *
  * This class allows access to the roboRIO's internal accelerometer.
  */
-class BuiltInAccelerometer : public ErrorBase,
-                             public Accelerometer,
-                             public Sendable,
-                             public SendableHelper<BuiltInAccelerometer> {
+class BuiltInAccelerometer : public Accelerometer,
+                             public wpi::Sendable,
+                             public wpi::SendableHelper<BuiltInAccelerometer> {
  public:
   /**
    * Constructor.
@@ -44,7 +38,7 @@
    *              accelerometer will measure. Not all accelerometers support all
    *              ranges.
    */
-  void SetRange(Range range) override;
+  void SetRange(Range range) final;
 
   /**
    * @return The acceleration of the roboRIO along the X axis in g-forces
@@ -61,7 +55,7 @@
    */
   double GetZ() override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/CAN.h b/wpilibc/src/main/native/include/frc/CAN.h
index 612d533..4c9b9bd 100644
--- a/wpilibc/src/main/native/include/frc/CAN.h
+++ b/wpilibc/src/main/native/include/frc/CAN.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -11,8 +8,6 @@
 
 #include <hal/CANAPITypes.h>
 
-#include "frc/ErrorBase.h"
-
 namespace frc {
 struct CANData {
   uint8_t data[8];
@@ -30,7 +25,7 @@
  * All methods are thread save, however the buffer objects passed in
  * by the user need to not be modified for the duration of their calls.
  */
-class CAN : public ErrorBase {
+class CAN {
  public:
   /**
    * Create a new CAN communication interface with the specific device ID.
@@ -55,7 +50,7 @@
   /**
    * Closes the CAN communication.
    */
-  ~CAN() override;
+  ~CAN();
 
   CAN(CAN&&) = default;
   CAN& operator=(CAN&&) = default;
diff --git a/wpilibc/src/main/native/include/frc/Compressor.h b/wpilibc/src/main/native/include/frc/Compressor.h
index d1a4dca..cc065ff 100644
--- a/wpilibc/src/main/native/include/frc/Compressor.h
+++ b/wpilibc/src/main/native/include/frc/Compressor.h
@@ -1,28 +1,25 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <hal/Types.h>
+#include <memory>
 
-#include "frc/ErrorBase.h"
+#include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/PneumaticsBase.h"
+#include "frc/PneumaticsModuleType.h"
 #include "frc/SensorUtil.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
- * Class for operating a compressor connected to a %PCM (Pneumatic Control
- * Module).
+ * Class for operating a compressor connected to a pneumatics module.
  *
- * The PCM will automatically run in closed loop mode by default whenever a
+ * The module will automatically run in closed loop mode by default whenever a
  * Solenoid object is created. For most cases, a Compressor object does not need
  * to be instantiated or used in a robot program. This class is only required in
  * cases where the robot program needs a more detailed status of the compressor
@@ -33,18 +30,28 @@
  * loop control. You can only turn off closed loop control, thereby stopping
  * the compressor from operating.
  */
-class Compressor : public ErrorBase,
-                   public Sendable,
-                   public SendableHelper<Compressor> {
+class Compressor : public wpi::Sendable,
+                   public wpi::SendableHelper<Compressor> {
  public:
   /**
-   * Constructor. The default PCM ID is 0.
+   * Constructs a compressor for a specified module and type.
    *
-   * @param module The PCM ID to use (0-62)
+   * @param module The module ID to use.
+   * @param moduleType The module type to use.
    */
-  explicit Compressor(int pcmID = SensorUtil::GetDefaultSolenoidModule());
+  Compressor(int module, PneumaticsModuleType moduleType);
 
-  ~Compressor() override = default;
+  /**
+   * Constructs a compressor for a default module and specified type.
+   *
+   * @param moduleType The module type to use.
+   */
+  explicit Compressor(PneumaticsModuleType moduleType);
+
+  ~Compressor() override;
+
+  Compressor(const Compressor&) = delete;
+  Compressor& operator=(const Compressor&) = delete;
 
   Compressor(Compressor&&) = default;
   Compressor& operator=(Compressor&&) = default;
@@ -100,92 +107,10 @@
    */
   bool GetClosedLoopControl() const;
 
-  /**
-   * Query if the compressor output has been disabled due to high current draw.
-   *
-   * @return true if PCM is in fault state : Compressor Drive is
-   *         disabled due to compressor current being too high.
-   */
-  bool GetCompressorCurrentTooHighFault() const;
-
-  /**
-   * Query if the compressor output has been disabled due to high current draw
-   * (sticky).
-   *
-   * A sticky fault will not clear on device reboot, it must be cleared through
-   * code or the webdash.
-   *
-   * @return true if PCM sticky fault is set : Compressor Drive is
-   *         disabled due to compressor current being too high.
-   */
-  bool GetCompressorCurrentTooHighStickyFault() const;
-
-  /**
-   * Query if the compressor output has been disabled due to a short circuit
-   * (sticky).
-   *
-   * A sticky fault will not clear on device reboot, it must be cleared through
-   * code or the webdash.
-   *
-   * @return true if PCM sticky fault is set : Compressor output
-   *         appears to be shorted.
-   */
-  bool GetCompressorShortedStickyFault() const;
-
-  /**
-   * Query if the compressor output has been disabled due to a short circuit.
-   *
-   * @return true if PCM is in fault state : Compressor output
-   *         appears to be shorted.
-   */
-  bool GetCompressorShortedFault() const;
-
-  /**
-   * Query if the compressor output does not appear to be wired (sticky).
-   *
-   * A sticky fault will not clear on device reboot, it must be cleared through
-   * code or the webdash.
-   *
-   * @return true if PCM sticky fault is set : Compressor does not
-   *         appear to be wired, i.e. compressor is not drawing enough current.
-   */
-  bool GetCompressorNotConnectedStickyFault() const;
-
-  /**
-   * Query if the compressor output does not appear to be wired.
-   *
-   * @return true if PCM is in fault state : Compressor does not
-   *         appear to be wired, i.e. compressor is not drawing enough current.
-   */
-  bool GetCompressorNotConnectedFault() const;
-
-  /**
-   * Clear ALL sticky faults inside PCM that Compressor is wired to.
-   *
-   * If a sticky fault is set, then it will be persistently cleared.  Compressor
-   * drive maybe momentarily disable while flags are being cleared. Care should
-   * be taken to not call this too frequently, otherwise normal compressor
-   * functionality may be prevented.
-   *
-   * If no sticky faults are set then this call will have no effect.
-   */
-  void ClearAllPCMStickyFaults();
-
-  /**
-   * Gets module number (CAN ID).
-   *
-   * @return Module number
-   */
-  int GetModule() const;
-
-  void InitSendable(SendableBuilder& builder) override;
-
- protected:
-  hal::Handle<HAL_CompressorHandle> m_compressorHandle;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
-  void SetCompressor(bool on);
-  int m_module;
+  std::shared_ptr<PneumaticsBase> m_module;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Controller.h b/wpilibc/src/main/native/include/frc/Controller.h
index c6b25ab..d750a0e 100644
--- a/wpilibc/src/main/native/include/frc/Controller.h
+++ b/wpilibc/src/main/native/include/frc/Controller.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/Counter.h b/wpilibc/src/main/native/include/frc/Counter.h
index 2770a02..d501b7e 100644
--- a/wpilibc/src/main/native/include/frc/Counter.h
+++ b/wpilibc/src/main/native/include/frc/Counter.h
@@ -1,26 +1,22 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
 #include <hal/Types.h>
+#include <units/time.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/AnalogTrigger.h"
 #include "frc/CounterBase.h"
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
 class DigitalGlitchFilter;
-class SendableBuilder;
 class DMA;
 class DMASample;
 
@@ -34,10 +30,9 @@
  * All counters will immediately start counting - Reset() them if you need them
  * to be zeroed before use.
  */
-class Counter : public ErrorBase,
-                public CounterBase,
-                public Sendable,
-                public SendableHelper<Counter> {
+class Counter : public CounterBase,
+                public wpi::Sendable,
+                public wpi::SendableHelper<Counter> {
   friend class DMA;
   friend class DMASample;
 
@@ -82,7 +77,7 @@
    *
    * This is used if an existing digital input is to be shared by multiple other
    * objects such as encoders or if the Digital Source is not a Digital Input
-   * channel (such as an Analog Trigger).
+   * channel (such as an Analog %Trigger).
    *
    * The counter will start counting immediately.
    * @param source A pointer to the existing DigitalSource object. It will be
@@ -96,7 +91,7 @@
    *
    * This is used if an existing digital input is to be shared by multiple other
    * objects such as encoders or if the Digital Source is not a Digital Input
-   * channel (such as an Analog Trigger).
+   * channel (such as an Analog %Trigger).
    *
    * The counter will start counting immediately.
    *
@@ -373,7 +368,7 @@
    *
    * @returns The period between the last two pulses in units of seconds.
    */
-  double GetPeriod() const override;
+  units::second_t GetPeriod() const override;
 
   /**
    * Set the maximum period where the device is still considered "moving".
@@ -385,7 +380,7 @@
    * @param maxPeriod The maximum period where the counted device is considered
    *                  moving in seconds.
    */
-  void SetMaxPeriod(double maxPeriod) override;
+  void SetMaxPeriod(units::second_t maxPeriod) final;
 
   /**
    * Select whether you want to continue updating the event timer output when
@@ -425,7 +420,7 @@
    */
   bool GetDirection() const override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  protected:
   // Makes the counter count up.
diff --git a/wpilibc/src/main/native/include/frc/CounterBase.h b/wpilibc/src/main/native/include/frc/CounterBase.h
index 7fde3ac..33febbf 100644
--- a/wpilibc/src/main/native/include/frc/CounterBase.h
+++ b/wpilibc/src/main/native/include/frc/CounterBase.h
@@ -1,12 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
+#include <units/time.h>
+
 namespace frc {
 
 /**
@@ -30,8 +29,8 @@
 
   virtual int Get() const = 0;
   virtual void Reset() = 0;
-  virtual double GetPeriod() const = 0;
-  virtual void SetMaxPeriod(double maxPeriod) = 0;
+  virtual units::second_t GetPeriod() const = 0;
+  virtual void SetMaxPeriod(units::second_t maxPeriod) = 0;
   virtual bool GetStopped() const = 0;
   virtual bool GetDirection() const = 0;
 };
diff --git a/wpilibc/src/main/native/include/frc/DMA.h b/wpilibc/src/main/native/include/frc/DMA.h
index 57cdd27..1bbf268 100644
--- a/wpilibc/src/main/native/include/frc/DMA.h
+++ b/wpilibc/src/main/native/include/frc/DMA.h
@@ -1,15 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/Types.h>
-
-#include "frc/ErrorBase.h"
+#include <units/time.h>
 
 namespace frc {
 class Encoder;
@@ -18,19 +14,22 @@
 class DutyCycle;
 class AnalogInput;
 class DMASample;
+class PWM;
+class PWMMotorController;
 
-class DMA : public ErrorBase {
+class DMA {
   friend class DMASample;
 
  public:
   DMA();
-  ~DMA() override;
+  ~DMA();
 
   DMA& operator=(DMA&& other) = default;
   DMA(DMA&& other) = default;
 
   void SetPause(bool pause);
-  void SetRate(int cycles);
+  void SetTimedTrigger(units::second_t seconds);
+  void SetTimedTriggerCycles(int cycles);
 
   void AddEncoder(const Encoder* encoder);
   void AddEncoderPeriod(const Encoder* encoder);
@@ -46,10 +45,15 @@
   void AddAveragedAnalogInput(const AnalogInput* analogInput);
   void AddAnalogAccumulator(const AnalogInput* analogInput);
 
-  void SetExternalTrigger(DigitalSource* source, bool rising, bool falling);
+  int SetExternalTrigger(DigitalSource* source, bool rising, bool falling);
+  int SetPwmEdgeTrigger(PWM* pwm, bool rising, bool falling);
+  int SetPwmEdgeTrigger(PWMMotorController* pwm, bool rising, bool falling);
 
-  void StartDMA(int queueDepth);
-  void StopDMA();
+  void ClearSensors();
+  void ClearExternalTriggers();
+
+  void Start(int queueDepth);
+  void Stop();
 
  private:
   hal::Handle<HAL_DMAHandle> dmaHandle;
diff --git a/wpilibc/src/main/native/include/frc/DMASample.h b/wpilibc/src/main/native/include/frc/DMASample.h
index c286c8d..48a0a9e 100644
--- a/wpilibc/src/main/native/include/frc/DMASample.h
+++ b/wpilibc/src/main/native/include/frc/DMASample.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -22,11 +19,16 @@
 namespace frc {
 class DMASample : public HAL_DMASample {
  public:
-  HAL_DMAReadStatus Update(const DMA* dma, units::second_t timeout,
-                           int32_t* remaining, int32_t* status) {
-    units::millisecond_t ms = timeout;
-    auto timeoutMs = ms.to<int32_t>();
-    return HAL_ReadDMA(dma->dmaHandle, this, timeoutMs, remaining, status);
+  enum class DMAReadStatus {
+    kOk = HAL_DMA_OK,
+    kTimeout = HAL_DMA_TIMEOUT,
+    kError = HAL_DMA_ERROR
+  };
+
+  DMAReadStatus Update(const DMA* dma, units::second_t timeout,
+                       int32_t* remaining, int32_t* status) {
+    return static_cast<DMAReadStatus>(
+        HAL_ReadDMA(dma->dmaHandle, this, timeout.value(), remaining, status));
   }
 
   uint64_t GetTime() const { return timeStamp; }
diff --git a/wpilibc/src/main/native/include/frc/DSControlWord.h b/wpilibc/src/main/native/include/frc/DSControlWord.h
new file mode 100644
index 0000000..fb0709f
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/DSControlWord.h
@@ -0,0 +1,102 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <hal/DriverStationTypes.h>
+
+namespace frc {
+
+/**
+ * A wrapper around Driver Station control word.
+ */
+class DSControlWord {
+ public:
+  /**
+   * DSControlWord constructor.
+   *
+   * Upon construction, the current Driver Station control word is read and
+   * stored internally.
+   */
+  DSControlWord();
+
+  /**
+   * Check if the DS has enabled the robot.
+   *
+   * @return True if the robot is enabled and the DS is connected
+   */
+  bool IsEnabled() const;
+
+  /**
+   * Check if the robot is disabled.
+   *
+   * @return True if the robot is explicitly disabled or the DS is not connected
+   */
+  bool IsDisabled() const;
+
+  /**
+   * Check if the robot is e-stopped.
+   *
+   * @return True if the robot is e-stopped
+   */
+  bool IsEStopped() const;
+
+  /**
+   * Check if the DS is commanding autonomous mode.
+   *
+   * @return True if the robot is being commanded to be in autonomous mode
+   */
+  bool IsAutonomous() const;
+
+  /**
+   * Check if the DS is commanding autonomous mode and if it has enabled the
+   * robot.
+   *
+   * @return True if the robot is being commanded to be in autonomous mode and
+   * enabled.
+   */
+  bool IsAutonomousEnabled() const;
+
+  /**
+   * Check if the DS is commanding teleop mode.
+   *
+   * @return True if the robot is being commanded to be in teleop mode
+   */
+  bool IsTeleop() const;
+
+  /**
+   * Check if the DS is commanding teleop mode and if it has enabled the robot.
+   *
+   * @return True if the robot is being commanded to be in teleop mode and
+   * enabled.
+   */
+  bool IsTeleopEnabled() const;
+
+  /**
+   * Check if the DS is commanding test mode.
+   *
+   * @return True if the robot is being commanded to be in test mode
+   */
+  bool IsTest() const;
+
+  /**
+   * Check if the DS is attached.
+   *
+   * @return True if the DS is connected to the robot
+   */
+  bool IsDSAttached() const;
+
+  /**
+   * Is the driver station attached to a Field Management System?
+   *
+   * @return True if the robot is competing on a field being controlled by a
+   *         Field Management System
+   */
+  bool IsFMSAttached() const;
+
+ private:
+  HAL_ControlWord m_controlWord;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Debouncer.h b/wpilibc/src/main/native/include/frc/Debouncer.h
new file mode 100644
index 0000000..8f583f0
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/Debouncer.h
@@ -0,0 +1,46 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <units/time.h>
+
+#include "frc/Timer.h"
+
+namespace frc {
+/**
+ * A simple debounce filter for boolean streams.  Requires that the boolean
+ * change value from baseline for a specified period of time before the filtered
+ * value changes.
+ */
+class Debouncer {
+ public:
+  enum DebounceType { kRising, kFalling, kBoth };
+
+  /**
+   * Creates a new Debouncer.
+   *
+   * @param debounceTime The number of seconds the value must change from
+   *                     baseline for the filtered value to change.
+   * @param type         Which type of state change the debouncing will be
+   *                     performed on.
+   */
+  explicit Debouncer(units::second_t debounceTime,
+                     DebounceType type = DebounceType::kRising);
+
+  /**
+   * Applies the debouncer to the input stream.
+   *
+   * @param input The current value of the input stream.
+   * @return The debounced value of the input stream.
+   */
+  bool Calculate(bool input);
+
+ private:
+  frc::Timer m_timer;
+  units::second_t m_debounceTime;
+  bool m_baseline;
+  DebounceType m_debounceType;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/DigitalGlitchFilter.h b/wpilibc/src/main/native/include/frc/DigitalGlitchFilter.h
index 0690e53..7172f21 100644
--- a/wpilibc/src/main/native/include/frc/DigitalGlitchFilter.h
+++ b/wpilibc/src/main/native/include/frc/DigitalGlitchFilter.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -12,11 +9,10 @@
 #include <array>
 
 #include <wpi/mutex.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/DigitalSource.h"
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
@@ -30,15 +26,14 @@
  * filter. The filter lets the user configure the time that an input must remain
  * high or low before it is classified as high or low.
  */
-class DigitalGlitchFilter : public ErrorBase,
-                            public Sendable,
-                            public SendableHelper<DigitalGlitchFilter> {
+class DigitalGlitchFilter : public wpi::Sendable,
+                            public wpi::SendableHelper<DigitalGlitchFilter> {
  public:
   DigitalGlitchFilter();
   ~DigitalGlitchFilter() override;
 
-  DigitalGlitchFilter(DigitalGlitchFilter&& rhs);
-  DigitalGlitchFilter& operator=(DigitalGlitchFilter&& rhs);
+  DigitalGlitchFilter(DigitalGlitchFilter&&) = default;
+  DigitalGlitchFilter& operator=(DigitalGlitchFilter&&) = default;
 
   /**
    * Assigns the DigitalSource to this glitch filter.
@@ -119,7 +114,7 @@
    */
   uint64_t GetPeriodNanoSeconds();
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   // Sets the filter for the input to be the requested index. A value of 0
diff --git a/wpilibc/src/main/native/include/frc/DigitalInput.h b/wpilibc/src/main/native/include/frc/DigitalInput.h
index 33aa716..cee31fd 100644
--- a/wpilibc/src/main/native/include/frc/DigitalInput.h
+++ b/wpilibc/src/main/native/include/frc/DigitalInput.h
@@ -1,20 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/DigitalSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
 class DigitalGlitchFilter;
-class SendableBuilder;
 
 /**
  * Class to read a digital input.
@@ -26,8 +23,8 @@
  * implemented anywhere else.
  */
 class DigitalInput : public DigitalSource,
-                     public Sendable,
-                     public SendableHelper<DigitalInput> {
+                     public wpi::Sendable,
+                     public wpi::SendableHelper<DigitalInput> {
  public:
   /**
    * Create an instance of a Digital Input class.
@@ -78,7 +75,7 @@
    */
   void SetSimDevice(HAL_SimDeviceHandle device);
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/DigitalOutput.h b/wpilibc/src/main/native/include/frc/DigitalOutput.h
index 1d1d152..0e124f1 100644
--- a/wpilibc/src/main/native/include/frc/DigitalOutput.h
+++ b/wpilibc/src/main/native/include/frc/DigitalOutput.h
@@ -1,22 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/DigitalSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Class to write to digital outputs.
  *
@@ -25,8 +20,8 @@
  * shouldn't be done here.
  */
 class DigitalOutput : public DigitalSource,
-                      public Sendable,
-                      public SendableHelper<DigitalOutput> {
+                      public wpi::Sendable,
+                      public wpi::SendableHelper<DigitalOutput> {
  public:
   /**
    * Create an instance of a digital output.
@@ -148,7 +143,7 @@
    */
   void SetSimDevice(HAL_SimDeviceHandle device);
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/DigitalSource.h b/wpilibc/src/main/native/include/frc/DigitalSource.h
index 5d77daa..0dd35d6 100644
--- a/wpilibc/src/main/native/include/frc/DigitalSource.h
+++ b/wpilibc/src/main/native/include/frc/DigitalSource.h
@@ -1,15 +1,12 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <hal/Types.h>
 
-#include "frc/InterruptableSensorBase.h"
+#include "frc/AnalogTriggerType.h"
 
 namespace frc {
 
@@ -22,7 +19,7 @@
  * constructed and freed when finished for the source. The source can either be
  * a digital input or analog trigger but not both.
  */
-class DigitalSource : public InterruptableSensorBase {
+class DigitalSource {
  public:
   DigitalSource() = default;
   DigitalSource(DigitalSource&&) = default;
diff --git a/wpilibc/src/main/native/include/frc/DoubleSolenoid.h b/wpilibc/src/main/native/include/frc/DoubleSolenoid.h
index 302c52c..381e3a1 100644
--- a/wpilibc/src/main/native/include/frc/DoubleSolenoid.h
+++ b/wpilibc/src/main/native/include/frc/DoubleSolenoid.h
@@ -1,53 +1,54 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <hal/Types.h>
+#include <memory>
 
-#include "frc/SolenoidBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/PneumaticsBase.h"
+#include "frc/PneumaticsModuleType.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * DoubleSolenoid class for running 2 channels of high voltage Digital Output
- * (PCM).
+ * on a pneumatics module.
  *
  * The DoubleSolenoid class is typically used for pneumatics solenoids that
  * have two positions controlled by two separate channels.
  */
-class DoubleSolenoid : public SolenoidBase,
-                       public Sendable,
-                       public SendableHelper<DoubleSolenoid> {
+class DoubleSolenoid : public wpi::Sendable,
+                       public wpi::SendableHelper<DoubleSolenoid> {
  public:
   enum Value { kOff, kForward, kReverse };
 
   /**
-   * Constructor.
+   * Constructs a double solenoid for a specified module of a specific module
+   * type.
    *
-   * Uses the default PCM ID of 0.
-   *
-   * @param forwardChannel The forward channel number on the PCM (0..7).
-   * @param reverseChannel The reverse channel number on the PCM (0..7).
+   * @param module The module of the solenoid module to use.
+   * @param moduleType The module type to use.
+   * @param forwardChannel The forward channel on the module to control.
+   * @param reverseChannel The reverse channel on the module to control.
    */
-  explicit DoubleSolenoid(int forwardChannel, int reverseChannel);
+  DoubleSolenoid(int module, PneumaticsModuleType moduleType,
+                 int forwardChannel, int reverseChannel);
 
   /**
-   * Constructor.
+   * Constructs a double solenoid for a default module of a specific module
+   * type.
    *
-   * @param moduleNumber   The CAN ID of the PCM.
-   * @param forwardChannel The forward channel on the PCM to control (0..7).
-   * @param reverseChannel The reverse channel on the PCM to control (0..7).
+   * @param moduleType The module type to use.
+   * @param forwardChannel The forward channel on the module to control.
+   * @param reverseChannel The reverse channel on the module to control.
    */
-  DoubleSolenoid(int moduleNumber, int forwardChannel, int reverseChannel);
+  DoubleSolenoid(PneumaticsModuleType moduleType, int forwardChannel,
+                 int reverseChannel);
 
   ~DoubleSolenoid() override;
 
@@ -78,36 +79,50 @@
   void Toggle();
 
   /**
-   * Check if the forward solenoid is blacklisted.
+   * Get the forward channel.
    *
-   * If a solenoid is shorted, it is added to the blacklist and disabled until
-   * power cycle, or until faults are cleared.
-   *
-   * @see ClearAllPCMStickyFaults()
-   * @return If solenoid is disabled due to short.
+   * @return the forward channel.
    */
-  bool IsFwdSolenoidBlackListed() const;
+  int GetFwdChannel() const;
 
   /**
-   * Check if the reverse solenoid is blacklisted.
+   * Get the reverse channel.
    *
-   * If a solenoid is shorted, it is added to the blacklist and disabled until
-   * power cycle, or until faults are cleared.
+   * @return the reverse channel.
+   */
+  int GetRevChannel() const;
+
+  /**
+   * Check if the forward solenoid is Disabled.
+   *
+   * If a solenoid is shorted, it is added to the DisabledList and disabled
+   * until power cycle, or until faults are cleared.
    *
    * @see ClearAllPCMStickyFaults()
    * @return If solenoid is disabled due to short.
    */
-  bool IsRevSolenoidBlackListed() const;
+  bool IsFwdSolenoidDisabled() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  /**
+   * Check if the reverse solenoid is Disabled.
+   *
+   * If a solenoid is shorted, it is added to the DisabledList and disabled
+   * until power cycle, or until faults are cleared.
+   *
+   * @see ClearAllPCMStickyFaults()
+   * @return If solenoid is disabled due to short.
+   */
+  bool IsRevSolenoidDisabled() const;
+
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
+  std::shared_ptr<PneumaticsBase> m_module;
   int m_forwardChannel;  // The forward channel on the module to control.
   int m_reverseChannel;  // The reverse channel on the module to control.
   int m_forwardMask;     // The mask for the forward channel.
   int m_reverseMask;     // The mask for the reverse channel.
-  hal::Handle<HAL_SolenoidHandle> m_forwardHandle;
-  hal::Handle<HAL_SolenoidHandle> m_reverseHandle;
+  int m_mask;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/DriverStation.h b/wpilibc/src/main/native/include/frc/DriverStation.h
index a6c40d6..30bf4fc 100644
--- a/wpilibc/src/main/native/include/frc/DriverStation.h
+++ b/wpilibc/src/main/native/include/frc/DriverStation.h
@@ -1,102 +1,64 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <array>
-#include <atomic>
-#include <memory>
 #include <string>
-#include <thread>
 
-#include <hal/DriverStationTypes.h>
-#include <wpi/Twine.h>
-#include <wpi/condition_variable.h>
-#include <wpi/mutex.h>
-
-#include "frc/ErrorBase.h"
+#include <units/time.h>
+#include <wpi/deprecated.h>
 
 namespace frc {
 
-class MatchDataSender;
-
 /**
  * Provide access to the network communication data to / from the Driver
  * Station.
  */
-class DriverStation : public ErrorBase {
+class DriverStation {
  public:
   enum Alliance { kRed, kBlue, kInvalid };
   enum MatchType { kNone, kPractice, kQualification, kElimination };
 
-  ~DriverStation() override;
-
-  DriverStation(const DriverStation&) = delete;
-  DriverStation& operator=(const DriverStation&) = delete;
-
   /**
    * Return a reference to the singleton DriverStation.
    *
    * @return Reference to the DS instance
+   * @deprecated Use the static methods
    */
+  WPI_DEPRECATED("Use static methods")
   static DriverStation& GetInstance();
 
-  /**
-   * Report an error to the DriverStation messages window.
-   *
-   * The error is also printed to the program console.
-   */
-  static void ReportError(const wpi::Twine& error);
-
-  /**
-   * Report a warning to the DriverStation messages window.
-   *
-   * The warning is also printed to the program console.
-   */
-  static void ReportWarning(const wpi::Twine& error);
-
-  /**
-   * Report an error to the DriverStation messages window.
-   *
-   * The error is also printed to the program console.
-   */
-  static void ReportError(bool isError, int code, const wpi::Twine& error,
-                          const wpi::Twine& location, const wpi::Twine& stack);
-
   static constexpr int kJoystickPorts = 6;
 
   /**
-   * The state of one joystick button. Button indexes begin at 1.
+   * The state of one joystick button. %Button indexes begin at 1.
    *
    * @param stick  The joystick to read.
    * @param button The button index, beginning at 1.
    * @return The state of the joystick button.
    */
-  bool GetStickButton(int stick, int button);
+  static bool GetStickButton(int stick, int button);
 
   /**
-   * Whether one joystick button was pressed since the last check. Button
+   * Whether one joystick button was pressed since the last check. %Button
    * indexes begin at 1.
    *
    * @param stick  The joystick to read.
    * @param button The button index, beginning at 1.
    * @return Whether the joystick button was pressed since the last check.
    */
-  bool GetStickButtonPressed(int stick, int button);
+  static bool GetStickButtonPressed(int stick, int button);
 
   /**
-   * Whether one joystick button was released since the last check. Button
+   * Whether one joystick button was released since the last check. %Button
    * indexes begin at 1.
    *
    * @param stick  The joystick to read.
    * @param button The button index, beginning at 1.
    * @return Whether the joystick button was released since the last check.
    */
-  bool GetStickButtonReleased(int stick, int button);
+  static bool GetStickButtonReleased(int stick, int button);
 
   /**
    * Get the value of the axis on a joystick.
@@ -108,14 +70,14 @@
    * @param axis  The analog axis value to read from the joystick.
    * @return The value of the axis on the joystick.
    */
-  double GetStickAxis(int stick, int axis);
+  static double GetStickAxis(int stick, int axis);
 
   /**
    * Get the state of a POV on the joystick.
    *
    * @return the angle of the POV in degrees, or -1 if the POV is not pressed.
    */
-  int GetStickPOV(int stick, int pov);
+  static int GetStickPOV(int stick, int pov);
 
   /**
    * The state of the buttons on the joystick.
@@ -123,7 +85,7 @@
    * @param stick The joystick to read.
    * @return The state of the buttons on the joystick.
    */
-  int GetStickButtons(int stick) const;
+  static int GetStickButtons(int stick);
 
   /**
    * Returns the number of axes on a given joystick port.
@@ -131,7 +93,7 @@
    * @param stick The joystick port number
    * @return The number of axes on the indicated joystick
    */
-  int GetStickAxisCount(int stick) const;
+  static int GetStickAxisCount(int stick);
 
   /**
    * Returns the number of POVs on a given joystick port.
@@ -139,7 +101,7 @@
    * @param stick The joystick port number
    * @return The number of POVs on the indicated joystick
    */
-  int GetStickPOVCount(int stick) const;
+  static int GetStickPOVCount(int stick);
 
   /**
    * Returns the number of buttons on a given joystick port.
@@ -147,7 +109,7 @@
    * @param stick The joystick port number
    * @return The number of buttons on the indicated joystick
    */
-  int GetStickButtonCount(int stick) const;
+  static int GetStickButtonCount(int stick);
 
   /**
    * Returns a boolean indicating if the controller is an xbox controller.
@@ -155,7 +117,7 @@
    * @param stick The joystick port number
    * @return A boolean that is true if the controller is an xbox controller.
    */
-  bool GetJoystickIsXbox(int stick) const;
+  static bool GetJoystickIsXbox(int stick);
 
   /**
    * Returns the type of joystick at a given port.
@@ -163,7 +125,7 @@
    * @param stick The joystick port number
    * @return The HID type of joystick at the given port
    */
-  int GetJoystickType(int stick) const;
+  static int GetJoystickType(int stick);
 
   /**
    * Returns the name of the joystick at the given port.
@@ -171,15 +133,16 @@
    * @param stick The joystick port number
    * @return The name of the joystick at the given port
    */
-  std::string GetJoystickName(int stick) const;
+  static std::string GetJoystickName(int stick);
 
   /**
    * Returns the types of Axes on a given joystick port.
    *
    * @param stick The joystick port number and the target axis
+   * @param axis  The analog axis value to read from the joystick.
    * @return What type of axis the axis is reporting to be
    */
-  int GetJoystickAxisType(int stick, int axis) const;
+  static int GetJoystickAxisType(int stick, int axis);
 
   /**
    * Returns if a joystick is connected to the Driver Station.
@@ -190,35 +153,35 @@
    * @param stick The joystick port number
    * @return true if a joystick is connected
    */
-  bool IsJoystickConnected(int stick) const;
+  static bool IsJoystickConnected(int stick);
 
   /**
    * Check if the DS has enabled the robot.
    *
    * @return True if the robot is enabled and the DS is connected
    */
-  bool IsEnabled() const;
+  static bool IsEnabled();
 
   /**
    * Check if the robot is disabled.
    *
    * @return True if the robot is explicitly disabled or the DS is not connected
    */
-  bool IsDisabled() const;
+  static bool IsDisabled();
 
   /**
    * Check if the robot is e-stopped.
    *
    * @return True if the robot is e-stopped
    */
-  bool IsEStopped() const;
+  static bool IsEStopped();
 
   /**
    * Check if the DS is commanding autonomous mode.
    *
    * @return True if the robot is being commanded to be in autonomous mode
    */
-  bool IsAutonomous() const;
+  static bool IsAutonomous();
 
   /**
    * Check if the DS is commanding autonomous mode and if it has enabled the
@@ -227,14 +190,33 @@
    * @return True if the robot is being commanded to be in autonomous mode and
    * enabled.
    */
-  bool IsAutonomousEnabled() const;
+  static bool IsAutonomousEnabled();
+
+  /**
+   * Check if the DS is commanding teleop mode.
+   *
+   * @return True if the robot is being commanded to be in teleop mode
+   * @deprecated Use IsTeleop() instead.
+   */
+  WPI_DEPRECATED("Use IsTeleop() instead")
+  static bool IsOperatorControl();
 
   /**
    * Check if the DS is commanding teleop mode.
    *
    * @return True if the robot is being commanded to be in teleop mode
    */
-  bool IsOperatorControl() const;
+  static bool IsTeleop();
+
+  /**
+   * Check if the DS is commanding teleop mode and if it has enabled the robot.
+   *
+   * @return True if the robot is being commanded to be in teleop mode and
+   * enabled.
+   * @deprecated Use IsTeleopEnabled() instead.
+   */
+  WPI_DEPRECATED("Use IsTeleopEnabled() instead")
+  static bool IsOperatorControlEnabled();
 
   /**
    * Check if the DS is commanding teleop mode and if it has enabled the robot.
@@ -242,21 +224,21 @@
    * @return True if the robot is being commanded to be in teleop mode and
    * enabled.
    */
-  bool IsOperatorControlEnabled() const;
+  static bool IsTeleopEnabled();
 
   /**
    * Check if the DS is commanding test mode.
    *
    * @return True if the robot is being commanded to be in test mode
    */
-  bool IsTest() const;
+  static bool IsTest();
 
   /**
    * Check if the DS is attached.
    *
    * @return True if the DS is connected to the robot
    */
-  bool IsDSAttached() const;
+  static bool IsDSAttached();
 
   /**
    * Has a new control packet from the driver station arrived since the last
@@ -267,7 +249,7 @@
    *
    * @return True if the control data has been updated since the last call.
    */
-  bool IsNewControlData() const;
+  static bool IsNewControlData();
 
   /**
    * Is the driver station attached to a Field Management System?
@@ -275,21 +257,21 @@
    * @return True if the robot is competing on a field being controlled by a
    *         Field Management System
    */
-  bool IsFMSAttached() const;
+  static bool IsFMSAttached();
 
   /**
    * Returns the game specific message provided by the FMS.
    *
    * @return A string containing the game specific message.
    */
-  std::string GetGameSpecificMessage() const;
+  static std::string GetGameSpecificMessage();
 
   /**
    * Returns the name of the competition event provided by the FMS.
    *
    * @return A string containing the event name
    */
-  std::string GetEventName() const;
+  static std::string GetEventName();
 
   /**
    * Returns the type of match being played provided by the FMS.
@@ -297,14 +279,14 @@
    * @return The match type enum (kNone, kPractice, kQualification,
    *         kElimination)
    */
-  MatchType GetMatchType() const;
+  static MatchType GetMatchType();
 
   /**
    * Returns the match number provided by the FMS.
    *
    * @return The number of the match
    */
-  int GetMatchNumber() const;
+  static int GetMatchNumber();
 
   /**
    * Returns the number of times the current match has been replayed from the
@@ -312,7 +294,7 @@
    *
    * @return The number of replays
    */
-  int GetReplayNumber() const;
+  static int GetReplayNumber();
 
   /**
    * Return the alliance that the driver station says it is on.
@@ -321,7 +303,7 @@
    *
    * @return The Alliance enum (kRed, kBlue or kInvalid)
    */
-  Alliance GetAlliance() const;
+  static Alliance GetAlliance();
 
   /**
    * Return the driver station location on the field.
@@ -330,7 +312,7 @@
    *
    * @return The location of the driver station (1-3, 0 for invalid)
    */
-  int GetLocation() const;
+  static int GetLocation();
 
   /**
    * Wait until a new packet comes from the driver station.
@@ -343,7 +325,7 @@
    * Checks if new control data has arrived since the last waitForData call
    * on the current thread. If new data has not arrived, returns immediately.
    */
-  void WaitForData();
+  static void WaitForData();
 
   /**
    * Wait until a new packet comes from the driver station, or wait for a
@@ -361,11 +343,11 @@
    * This is a good way to delay processing until there is new driver station
    * data to act on.
    *
-   * @param timeout Timeout time in seconds
+   * @param timeout Timeout
    *
    * @return true if new data, otherwise false
    */
-  bool WaitForData(double timeout);
+  static bool WaitForData(units::second_t timeout);
 
   /**
    * Return the approximate match time.
@@ -382,14 +364,14 @@
    *
    * @return Time remaining in current match period (auto or teleop)
    */
-  double GetMatchTime() const;
+  static double GetMatchTime();
 
   /**
    * Read the battery voltage.
    *
    * @return The battery voltage in Volts.
    */
-  double GetBatteryVoltage() const;
+  static double GetBatteryVoltage();
 
   /**
    * Only to be used to tell the Driver Station what code you claim to be
@@ -398,7 +380,7 @@
    * @param entering If true, starting disabled code; if false, leaving disabled
    *                 code.
    */
-  void InDisabled(bool entering) { m_userInDisabled = entering; }
+  static void InDisabled(bool entering);
 
   /**
    * Only to be used to tell the Driver Station what code you claim to be
@@ -407,7 +389,18 @@
    * @param entering If true, starting autonomous code; if false, leaving
    *                 autonomous code.
    */
-  void InAutonomous(bool entering) { m_userInAutonomous = entering; }
+  static void InAutonomous(bool entering);
+
+  /**
+   * Only to be used to tell the Driver Station what code you claim to be
+   * executing for diagnostic purposes only.
+   *
+   * @param entering If true, starting teleop code; if false, leaving teleop
+   *                 code.
+   * @deprecated Use InTeleop() instead.
+   */
+  WPI_DEPRECATED("Use InTeleop() instead")
+  static void InOperatorControl(bool entering);
 
   /**
    * Only to be used to tell the Driver Station what code you claim to be
@@ -416,7 +409,7 @@
    * @param entering If true, starting teleop code; if false, leaving teleop
    *                 code.
    */
-  void InOperatorControl(bool entering) { m_userInTeleop = entering; }
+  static void InTeleop(bool entering);
 
   /**
    * Only to be used to tell the Driver Station what code you claim to be
@@ -424,12 +417,12 @@
    *
    * @param entering If true, starting test code; if false, leaving test code.
    */
-  void InTest(bool entering) { m_userInTest = entering; }
+  static void InTest(bool entering);
 
   /**
    * Forces WaitForData() to return immediately.
    */
-  void WakeupWaitForData();
+  static void WakeupWaitForData();
 
   /**
    * Allows the user to specify whether they want joystick connection warnings
@@ -438,7 +431,7 @@
    *
    * @param silence Whether warning messages should be silenced.
    */
-  void SilenceJoystickConnectionWarning(bool silence);
+  static void SilenceJoystickConnectionWarning(bool silence);
 
   /**
    * Returns whether joystick connection warnings are silenced. This will
@@ -446,68 +439,10 @@
    *
    * @return Whether joystick connection warnings are silenced.
    */
-  bool IsJoystickConnectionWarningSilenced() const;
-
- protected:
-  /**
-   * Copy data from the DS task for the user.
-   *
-   * If no new data exists, it will just be returned, otherwise
-   * the data will be copied from the DS polling loop.
-   */
-  void GetData();
+  static bool IsJoystickConnectionWarningSilenced();
 
  private:
-  /**
-   * DriverStation constructor.
-   *
-   * This is only called once the first time GetInstance() is called
-   */
-  DriverStation();
-
-  /**
-   * Reports errors related to unplugged joysticks.
-   *
-   * Throttles the errors so that they don't overwhelm the DS.
-   */
-  void ReportJoystickUnpluggedError(const wpi::Twine& message);
-
-  /**
-   * Reports errors related to unplugged joysticks.
-   *
-   * Throttles the errors so that they don't overwhelm the DS.
-   */
-  void ReportJoystickUnpluggedWarning(const wpi::Twine& message);
-
-  void Run();
-
-  void SendMatchData();
-
-  std::unique_ptr<MatchDataSender> m_matchDataSender;
-
-  // Joystick button rising/falling edge flags
-  wpi::mutex m_buttonEdgeMutex;
-  std::array<HAL_JoystickButtons, kJoystickPorts> m_previousButtonStates;
-  std::array<uint32_t, kJoystickPorts> m_joystickButtonsPressed;
-  std::array<uint32_t, kJoystickPorts> m_joystickButtonsReleased;
-
-  // Internal Driver Station thread
-  std::thread m_dsThread;
-  std::atomic<bool> m_isRunning{false};
-
-  mutable wpi::mutex m_waitForDataMutex;
-  wpi::condition_variable m_waitForDataCond;
-  int m_waitForDataCounter;
-
-  bool m_silenceJoystickWarning = false;
-
-  // Robot state status variables
-  bool m_userInDisabled = false;
-  bool m_userInAutonomous = false;
-  bool m_userInTeleop = false;
-  bool m_userInTest = false;
-
-  double m_nextMessageTime = 0;
+  DriverStation() = default;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/DutyCycle.h b/wpilibc/src/main/native/include/frc/DutyCycle.h
index f0fc2d8..7f45d06 100644
--- a/wpilibc/src/main/native/include/frc/DutyCycle.h
+++ b/wpilibc/src/main/native/include/frc/DutyCycle.h
@@ -1,19 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
 #include <hal/Types.h>
-
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 class DigitalSource;
@@ -32,9 +27,7 @@
  * order to implement rollover checking.
  *
  */
-class DutyCycle : public ErrorBase,
-                  public Sendable,
-                  public SendableHelper<DutyCycle> {
+class DutyCycle : public wpi::Sendable, public wpi::SendableHelper<DutyCycle> {
   friend class AnalogTrigger;
   friend class DMA;
   friend class DMASample;
@@ -125,7 +118,7 @@
   int GetSourceChannel() const;
 
  protected:
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   void InitDutyCycle();
diff --git a/wpilibc/src/main/native/include/frc/DutyCycleEncoder.h b/wpilibc/src/main/native/include/frc/DutyCycleEncoder.h
index 17b038f..ccf56ad 100644
--- a/wpilibc/src/main/native/include/frc/DutyCycleEncoder.h
+++ b/wpilibc/src/main/native/include/frc/DutyCycleEncoder.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -12,12 +9,11 @@
 #include <hal/SimDevice.h>
 #include <hal/Types.h>
 #include <units/angle.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/AnalogTrigger.h"
 #include "frc/Counter.h"
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 class DutyCycle;
@@ -28,9 +24,8 @@
  * PWM Output, the CTRE Mag Encoder, the Rev Hex Encoder, and the AM Mag
  * Encoder.
  */
-class DutyCycleEncoder : public ErrorBase,
-                         public Sendable,
-                         public SendableHelper<DutyCycleEncoder> {
+class DutyCycleEncoder : public wpi::Sendable,
+                         public wpi::SendableHelper<DutyCycleEncoder> {
  public:
   /**
    * Construct a new DutyCycleEncoder on a specific channel.
@@ -63,21 +58,21 @@
   /**
    * Construct a new DutyCycleEncoder attached to a DigitalSource object.
    *
-   * @param source the digital source to attach to
+   * @param digitalSource the digital source to attach to
    */
   explicit DutyCycleEncoder(DigitalSource& digitalSource);
 
   /**
    * Construct a new DutyCycleEncoder attached to a DigitalSource object.
    *
-   * @param source the digital source to attach to
+   * @param digitalSource the digital source to attach to
    */
   explicit DutyCycleEncoder(DigitalSource* digitalSource);
 
   /**
    * Construct a new DutyCycleEncoder attached to a DigitalSource object.
    *
-   * @param source the digital source to attach to
+   * @param digitalSource the digital source to attach to
    */
   explicit DutyCycleEncoder(std::shared_ptr<DigitalSource> digitalSource);
 
@@ -168,7 +163,7 @@
    */
   int GetSourceChannel() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   void Init();
diff --git a/wpilibc/src/main/native/include/frc/Encoder.h b/wpilibc/src/main/native/include/frc/Encoder.h
index 76f9d1c..f6753c2 100644
--- a/wpilibc/src/main/native/include/frc/Encoder.h
+++ b/wpilibc/src/main/native/include/frc/Encoder.h
@@ -1,28 +1,23 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 
 #include <hal/Types.h>
+#include <wpi/deprecated.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/Counter.h"
 #include "frc/CounterBase.h"
-#include "frc/ErrorBase.h"
-#include "frc/PIDSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
 class DigitalSource;
 class DigitalGlitchFilter;
-class SendableBuilder;
 class DMA;
 class DMASample;
 
@@ -41,11 +36,9 @@
  * All encoders will immediately start counting - Reset() them if you need them
  * to be zeroed before use.
  */
-class Encoder : public ErrorBase,
-                public CounterBase,
-                public PIDSource,
-                public Sendable,
-                public SendableHelper<Encoder> {
+class Encoder : public CounterBase,
+                public wpi::Sendable,
+                public wpi::SendableHelper<Encoder> {
   friend class DMA;
   friend class DMASample;
 
@@ -174,7 +167,7 @@
    *
    * @return Period in seconds of the most recent pulse.
    */
-  double GetPeriod() const override;
+  units::second_t GetPeriod() const override;
 
   /**
    * Sets the maximum period for stopped detection.
@@ -195,7 +188,7 @@
   WPI_DEPRECATED(
       "Use SetMinRate() in favor of this method.  This takes unscaled periods "
       "and SetMinRate() scales using value from SetDistancePerPulse().")
-  void SetMaxPeriod(double maxPeriod) override;
+  void SetMaxPeriod(units::second_t maxPeriod) override;
 
   /**
    * Determine if the encoder is stopped.
@@ -317,8 +310,6 @@
    */
   int GetSamplesToAverage() const;
 
-  double PIDGet() override;
-
   /**
    * Set the index source for the encoder.
    *
@@ -334,8 +325,8 @@
    *
    * When this source is activated, the encoder count automatically resets.
    *
-   * @param channel A digital source to set as the encoder index
-   * @param type    The state that will cause the encoder to reset
+   * @param source A digital source to set as the encoder index
+   * @param type   The state that will cause the encoder to reset
    */
   void SetIndexSource(const DigitalSource& source,
                       IndexingType type = kResetOnRisingEdge);
@@ -349,7 +340,7 @@
 
   int GetFPGAIndex() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   /**
diff --git a/wpilibc/src/main/native/include/frc/Error.h b/wpilibc/src/main/native/include/frc/Error.h
deleted file mode 100644
index d63fb62..0000000
--- a/wpilibc/src/main/native/include/frc/Error.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <string>
-
-#include <wpi/StringRef.h>
-#include <wpi/Twine.h>
-
-#ifdef _WIN32
-#pragma push_macro("GetMessage")
-#undef GetMessage
-#endif
-
-namespace frc {
-
-class ErrorBase;
-
-/**
- * Error object represents a library error.
- */
-class Error {
- public:
-  using Code = int;
-
-  Error() = default;
-  Error(Code code, const wpi::Twine& contextMessage, wpi::StringRef filename,
-        wpi::StringRef function, int lineNumber,
-        const ErrorBase* originatingObject);
-
-  bool operator<(const Error& rhs) const;
-
-  Code GetCode() const;
-  std::string GetMessage() const;
-  std::string GetFilename() const;
-  std::string GetFunction() const;
-  int GetLineNumber() const;
-  const ErrorBase* GetOriginatingObject() const;
-  double GetTimestamp() const;
-  void Clear();
-  void Set(Code code, const wpi::Twine& contextMessage, wpi::StringRef filename,
-           wpi::StringRef function, int lineNumber,
-           const ErrorBase* originatingObject);
-
- private:
-  void Report();
-
-  Code m_code = 0;
-  std::string m_message;
-  std::string m_filename;
-  std::string m_function;
-  int m_lineNumber = 0;
-  const ErrorBase* m_originatingObject = nullptr;
-  double m_timestamp = 0.0;
-};
-
-}  // namespace frc
-
-#ifdef _WIN32
-#pragma pop_macro("GetMessage")
-#endif
diff --git a/wpilibc/src/main/native/include/frc/ErrorBase.h b/wpilibc/src/main/native/include/frc/ErrorBase.h
deleted file mode 100644
index 0ced9a2..0000000
--- a/wpilibc/src/main/native/include/frc/ErrorBase.h
+++ /dev/null
@@ -1,242 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <vector>
-
-#include <wpi/StringRef.h>
-#include <wpi/Twine.h>
-
-#include "frc/Error.h"
-
-// Forward declared manually to avoid needing to pull in entire HAL header.
-extern "C" const char* HAL_GetErrorMessage(int32_t code);
-
-#define wpi_setErrnoErrorWithContext(context) \
-  this->SetErrnoError((context), __FILE__, __FUNCTION__, __LINE__)
-#define wpi_setErrnoError() wpi_setErrnoErrorWithContext("")
-#define wpi_setImaqErrorWithContext(code, context)                             \
-  do {                                                                         \
-    if ((code) != 0)                                                           \
-      this->SetImaqError((code), (context), __FILE__, __FUNCTION__, __LINE__); \
-  } while (0)
-#define wpi_setErrorWithContext(code, context)                             \
-  do {                                                                     \
-    if ((code) != 0)                                                       \
-      this->SetError((code), (context), __FILE__, __FUNCTION__, __LINE__); \
-  } while (0)
-#define wpi_setErrorWithContextRange(code, min, max, req, context)          \
-  do {                                                                      \
-    if ((code) != 0)                                                        \
-      this->SetErrorRange((code), (min), (max), (req), (context), __FILE__, \
-                          __FUNCTION__, __LINE__);                          \
-  } while (0)
-
-#define wpi_setHALError(code)                                     \
-  do {                                                            \
-    if ((code) != 0)                                              \
-      this->SetError((code), HAL_GetErrorMessage(code), __FILE__, \
-                     __FUNCTION__, __LINE__);                     \
-  } while (0)
-
-#define wpi_setHALErrorWithRange(code, min, max, req)                        \
-  do {                                                                       \
-    if ((code) != 0)                                                         \
-      this->SetErrorRange((code), (min), (max), (req),                       \
-                          HAL_GetErrorMessage(code), __FILE__, __FUNCTION__, \
-                          __LINE__);                                         \
-  } while (0)
-
-#define wpi_setError(code) wpi_setErrorWithContext(code, "")
-#define wpi_setStaticErrorWithContext(object, code, context)                 \
-  do {                                                                       \
-    if ((code) != 0)                                                         \
-      object->SetError((code), (context), __FILE__, __FUNCTION__, __LINE__); \
-  } while (0)
-#define wpi_setStaticError(object, code) \
-  wpi_setStaticErrorWithContext(object, code, "")
-
-#define wpi_setGlobalErrorWithContext(code, context)                \
-  do {                                                              \
-    if ((code) != 0)                                                \
-      ::frc::ErrorBase::SetGlobalError((code), (context), __FILE__, \
-                                       __FUNCTION__, __LINE__);     \
-  } while (0)
-
-#define wpi_setGlobalHALError(code)                                       \
-  do {                                                                    \
-    if ((code) != 0)                                                      \
-      ::frc::ErrorBase::SetGlobalError((code), HAL_GetErrorMessage(code), \
-                                       __FILE__, __FUNCTION__, __LINE__); \
-  } while (0)
-
-#define wpi_setGlobalError(code) wpi_setGlobalErrorWithContext(code, "")
-#define wpi_setWPIErrorWithContext(error, context)                    \
-  this->SetWPIError(wpi_error_s_##error(), wpi_error_value_##error(), \
-                    (context), __FILE__, __FUNCTION__, __LINE__)
-#define wpi_setWPIError(error) (wpi_setWPIErrorWithContext(error, ""))
-#define wpi_setStaticWPIErrorWithContext(object, error, context)  \
-  object->SetWPIError(wpi_error_s_##error(), (context), __FILE__, \
-                      __FUNCTION__, __LINE__)
-#define wpi_setStaticWPIError(object, error) \
-  wpi_setStaticWPIErrorWithContext(object, error, "")
-#define wpi_setGlobalWPIErrorWithContext(error, context)                \
-  ::frc::ErrorBase::SetGlobalWPIError(wpi_error_s_##error(), (context), \
-                                      __FILE__, __FUNCTION__, __LINE__)
-#define wpi_setGlobalWPIError(error) wpi_setGlobalWPIErrorWithContext(error, "")
-
-namespace frc {
-
-/**
- * Base class for most objects.
- *
- * ErrorBase is the base class for most objects since it holds the generated
- * error for that object. In addition, there is a single instance of a global
- * error object.
- */
-class ErrorBase {
-  // TODO: Consider initializing instance variables and cleanup in destructor
- public:
-  ErrorBase();
-  virtual ~ErrorBase() = default;
-
-  ErrorBase(const ErrorBase&) = default;
-  ErrorBase& operator=(const ErrorBase&) = default;
-  ErrorBase(ErrorBase&&) = default;
-  ErrorBase& operator=(ErrorBase&&) = default;
-
-  /**
-   * @brief Retrieve the current error.
-   *
-   * Get the current error information associated with this sensor.
-   */
-  virtual Error& GetError();
-
-  /**
-   * @brief Retrieve the current error.
-   *
-   * Get the current error information associated with this sensor.
-   */
-  virtual const Error& GetError() const;
-
-  /**
-   * @brief Clear the current error information associated with this sensor.
-   */
-  virtual void ClearError() const;
-
-  /**
-   * @brief Set error information associated with a C library call that set an
-   *        error to the "errno" global variable.
-   *
-   * @param contextMessage A custom message from the code that set the error.
-   * @param filename       Filename of the error source
-   * @param function       Function of the error source
-   * @param lineNumber     Line number of the error source
-   */
-  virtual void SetErrnoError(const wpi::Twine& contextMessage,
-                             wpi::StringRef filename, wpi::StringRef function,
-                             int lineNumber) const;
-
-  /**
-   * @brief Set the current error information associated from the nivision Imaq
-   *        API.
-   *
-   * @param success        The return from the function
-   * @param contextMessage A custom message from the code that set the error.
-   * @param filename       Filename of the error source
-   * @param function       Function of the error source
-   * @param lineNumber     Line number of the error source
-   */
-  virtual void SetImaqError(int success, const wpi::Twine& contextMessage,
-                            wpi::StringRef filename, wpi::StringRef function,
-                            int lineNumber) const;
-
-  /**
-   * @brief Set the current error information associated with this sensor.
-   *
-   * @param code           The error code
-   * @param contextMessage A custom message from the code that set the error.
-   * @param filename       Filename of the error source
-   * @param function       Function of the error source
-   * @param lineNumber     Line number of the error source
-   */
-  virtual void SetError(Error::Code code, const wpi::Twine& contextMessage,
-                        wpi::StringRef filename, wpi::StringRef function,
-                        int lineNumber) const;
-
-  /**
-   * @brief Set the current error information associated with this sensor.
-   * Range versions use for initialization code.
-   *
-   * @param code           The error code
-   * @param minRange       The minimum allowed allocation range
-   * @param maxRange       The maximum allowed allocation range
-   * @param requestedValue The requested value to allocate
-   * @param contextMessage A custom message from the code that set the error.
-   * @param filename       Filename of the error source
-   * @param function       Function of the error source
-   * @param lineNumber     Line number of the error source
-   */
-  virtual void SetErrorRange(Error::Code code, int32_t minRange,
-                             int32_t maxRange, int32_t requestedValue,
-                             const wpi::Twine& contextMessage,
-                             wpi::StringRef filename, wpi::StringRef function,
-                             int lineNumber) const;
-
-  /**
-   * @brief Set the current error information associated with this sensor.
-   *
-   * @param errorMessage   The error message from WPIErrors.h
-   * @param contextMessage A custom message from the code that set the error.
-   * @param filename       Filename of the error source
-   * @param function       Function of the error source
-   * @param lineNumber     Line number of the error source
-   */
-  virtual void SetWPIError(const wpi::Twine& errorMessage, Error::Code code,
-                           const wpi::Twine& contextMessage,
-                           wpi::StringRef filename, wpi::StringRef function,
-                           int lineNumber) const;
-
-  virtual void CloneError(const ErrorBase& rhs) const;
-
-  /**
-   * @brief Check if the current error code represents a fatal error.
-   *
-   * @return true if the current error is fatal.
-   */
-  virtual bool StatusIsFatal() const;
-
-  static void SetGlobalError(Error::Code code, const wpi::Twine& contextMessage,
-                             wpi::StringRef filename, wpi::StringRef function,
-                             int lineNumber);
-
-  static void SetGlobalWPIError(const wpi::Twine& errorMessage,
-                                const wpi::Twine& contextMessage,
-                                wpi::StringRef filename,
-                                wpi::StringRef function, int lineNumber);
-
-  /**
-   * Retrieve the last global error.
-   */
-  static Error GetGlobalError();
-
-  /**
-   * Retrieve all global errors.
-   */
-  static std::vector<Error> GetGlobalErrors();
-
-  /**
-   * Clear global errors.
-   */
-  void ClearGlobalErrors();
-
- protected:
-  mutable Error m_error;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Errors.h b/wpilibc/src/main/native/include/frc/Errors.h
new file mode 100644
index 0000000..84edc18
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/Errors.h
@@ -0,0 +1,177 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <stdint.h>
+
+#include <memory>
+#include <stdexcept>
+#include <string>
+
+#include <fmt/format.h>
+
+namespace frc {
+
+/**
+ * Runtime error exception.
+ */
+class RuntimeError : public std::runtime_error {
+ public:
+  RuntimeError(int32_t code, std::string&& loc, std::string&& stack,
+               std::string&& message);
+  RuntimeError(int32_t code, const char* fileName, int lineNumber,
+               const char* funcName, std::string&& stack,
+               std::string&& message);
+
+  int32_t code() const noexcept { return m_data->code; }
+  const char* loc() const noexcept { return m_data->loc.c_str(); }
+  const char* stack() const noexcept { return m_data->stack.c_str(); }
+
+  /**
+   * Reports error to Driver Station (using HAL_SendError).
+   */
+  void Report() const;
+
+ private:
+  struct Data {
+    int32_t code;
+    std::string loc;
+    std::string stack;
+  };
+  std::shared_ptr<Data> m_data;
+};
+
+/**
+ * Gets error message string for an error code.
+ */
+const char* GetErrorMessage(int32_t* code);
+
+/**
+ * Reports an error to the driver station (using HAL_SendError).
+ * Generally the FRC_ReportError wrapper macro should be used instead.
+ *
+ * @param[out] status error code
+ * @param[in]  fileName source file name
+ * @param[in]  lineNumber source line number
+ * @param[in]  funcName source function name
+ * @param[in]  format error message format
+ * @param[in]  args error message format args
+ */
+void ReportErrorV(int32_t status, const char* fileName, int lineNumber,
+                  const char* funcName, fmt::string_view format,
+                  fmt::format_args args);
+
+/**
+ * Reports an error to the driver station (using HAL_SendError).
+ * Generally the FRC_ReportError wrapper macro should be used instead.
+ *
+ * @param[out] status error code
+ * @param[in]  fileName source file name
+ * @param[in]  lineNumber source line number
+ * @param[in]  funcName source function name
+ * @param[in]  format error message format
+ * @param[in]  args error message format args
+ */
+template <typename S, typename... Args>
+inline void ReportError(int32_t status, const char* fileName, int lineNumber,
+                        const char* funcName, const S& format, Args&&... args) {
+  ReportErrorV(status, fileName, lineNumber, funcName, format,
+               fmt::make_args_checked<Args...>(format, args...));
+}
+
+/**
+ * Makes a runtime error exception object. This object should be thrown
+ * by the caller. Generally the FRC_MakeError wrapper macro should be used
+ * instead.
+ *
+ * @param[out] status error code
+ * @param[in]  fileName source file name
+ * @param[in]  lineNumber source line number
+ * @param[in]  funcName source function name
+ * @param[in]  format error message format
+ * @param[in]  args error message format args
+ * @return runtime error object
+ */
+[[nodiscard]] RuntimeError MakeErrorV(int32_t status, const char* fileName,
+                                      int lineNumber, const char* funcName,
+                                      fmt::string_view format,
+                                      fmt::format_args args);
+
+template <typename S, typename... Args>
+[[nodiscard]] inline RuntimeError MakeError(int32_t status,
+                                            const char* fileName,
+                                            int lineNumber,
+                                            const char* funcName,
+                                            const S& format, Args&&... args) {
+  return MakeErrorV(status, fileName, lineNumber, funcName, format,
+                    fmt::make_args_checked<Args...>(format, args...));
+}
+
+namespace err {
+#define S(label, offset, message) inline constexpr int label = offset;
+#include "frc/WPIErrors.mac"
+#undef S
+}  // namespace err
+
+namespace warn {
+#define S(label, offset, message) inline constexpr int label = offset;
+#include "frc/WPIWarnings.mac"
+#undef S
+}  // namespace warn
+}  // namespace frc
+
+/**
+ * Reports an error to the driver station (using HAL_SendError).
+ *
+ * @param[out] status error code
+ * @param[in]  format error message format
+ */
+#define FRC_ReportError(status, format, ...)                       \
+  do {                                                             \
+    if ((status) != 0) {                                           \
+      ::frc::ReportError(status, __FILE__, __LINE__, __FUNCTION__, \
+                         FMT_STRING(format), __VA_ARGS__);         \
+    }                                                              \
+  } while (0)
+
+/**
+ * Makes a runtime error exception object. This object should be thrown
+ * by the caller.
+ *
+ * @param[out] status error code
+ * @param[in]  format error message format
+ * @return runtime error object
+ */
+#define FRC_MakeError(status, format, ...)                   \
+  ::frc::MakeError(status, __FILE__, __LINE__, __FUNCTION__, \
+                   FMT_STRING(format), __VA_ARGS__)
+
+/**
+ * Checks a status code and depending on its value, either throws a
+ * RuntimeError exception, calls ReportError, or does nothing (if no error).
+ *
+ * @param[out] status error code
+ * @param[in]  format error message format
+ */
+#define FRC_CheckErrorStatus(status, format, ...)                      \
+  do {                                                                 \
+    if ((status) < 0) {                                                \
+      throw ::frc::MakeError(status, __FILE__, __LINE__, __FUNCTION__, \
+                             FMT_STRING(format), __VA_ARGS__);         \
+    } else if ((status) > 0) {                                         \
+      ::frc::ReportError(status, __FILE__, __LINE__, __FUNCTION__,     \
+                         FMT_STRING(format), __VA_ARGS__);             \
+    }                                                                  \
+  } while (0)
+
+#define FRC_AssertMessage(condition, format, ...)                            \
+  do {                                                                       \
+    if (!(condition)) {                                                      \
+      throw ::frc::MakeError(err::AssertionFailure, __FILE__, __LINE__,      \
+                             __FUNCTION__, FMT_STRING(format), __VA_ARGS__); \
+    }                                                                        \
+  } while (0)
+
+#define FRC_Assert(condition) FRC_AssertMessage(condition, "{}", #condition)
diff --git a/wpilibc/src/main/native/include/frc/Filesystem.h b/wpilibc/src/main/native/include/frc/Filesystem.h
index f196f7a..fbfc681 100644
--- a/wpilibc/src/main/native/include/frc/Filesystem.h
+++ b/wpilibc/src/main/native/include/frc/Filesystem.h
@@ -1,34 +1,30 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/SmallVector.h>
+#include <string>
 
-namespace frc {
 /** WPILib FileSystem namespace */
-namespace filesystem {
+namespace frc::filesystem {
 
 /**
  * Obtains the current working path that the program was launched with.
  * This is analogous to the `pwd` command on unix.
  *
- * @param result The result of the current working path lookup.
+ * @return The result of the current working path lookup.
  */
-void GetLaunchDirectory(wpi::SmallVectorImpl<char>& result);
+std::string GetLaunchDirectory();
 
 /**
  * Obtains the operating directory of the program. On the roboRIO, this
  * is /home/lvuser. In simulation, it is where the simulation was launched
  * from (`pwd`).
  *
- * @param result The result of the operating directory lookup.
+ * @return The result of the operating directory lookup.
  */
-void GetOperatingDirectory(wpi::SmallVectorImpl<char>& result);
+std::string GetOperatingDirectory();
 
 /**
  * Obtains the deploy directory of the program, which is the remote location
@@ -36,9 +32,8 @@
  * /home/lvuser/deploy. In simulation, it is where the simulation was launched
  * from, in the subdirectory "src/main/deploy" (`pwd`/src/main/deploy).
  *
- * @param result The result of the operating directory lookup
+ * @return The result of the operating directory lookup
  */
-void GetDeployDirectory(wpi::SmallVectorImpl<char>& result);
+std::string GetDeployDirectory();
 
-}  // namespace filesystem
-}  // namespace frc
+}  // namespace frc::filesystem
diff --git a/wpilibc/src/main/native/include/frc/GearTooth.h b/wpilibc/src/main/native/include/frc/GearTooth.h
deleted file mode 100644
index 2d1f792..0000000
--- a/wpilibc/src/main/native/include/frc/GearTooth.h
+++ /dev/null
@@ -1,88 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <wpi/deprecated.h>
-
-#include "frc/Counter.h"
-
-namespace frc {
-
-/**
- * Alias for counter class.
- *
- * Implements the gear tooth sensor supplied by FIRST. Currently there is no
- * reverse sensing on the gear tooth sensor, but in future versions we might
- * implement the necessary timing in the FPGA to sense direction.
- *
- * @deprecated No longer used per FMS usage reporting
- */
-class GearTooth : public Counter {
- public:
-  // 55 uSec for threshold
-  static constexpr double kGearToothThreshold = 55e-6;
-
-  /**
-   * Construct a GearTooth sensor given a channel.
-   *
-   * @param channel            The DIO channel that the sensor is connected to.
-   *                           0-9 are on-board, 10-25 are on the MXP.
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(int channel, bool directionSensitive = false);
-
-  /**
-   * Construct a GearTooth sensor given a digital input.
-   *
-   * This should be used when sharing digital inputs.
-   *
-   * @param source             A pointer to the existing DigitalSource object
-   *                           (such as a DigitalInput)
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(DigitalSource* source, bool directionSensitive = false);
-
-  /**
-   * Construct a GearTooth sensor given a digital input.
-   *
-   * This should be used when sharing digital inputs.
-   *
-   * @param source             A reference to the existing DigitalSource object
-   *                           (such as a DigitalInput)
-   * @param directionSensitive True to enable the pulse length decoding in
-   *                           hardware to specify count direction.
-   */
-  WPI_DEPRECATED(
-      "The only sensor this works with is no longer available and no teams use "
-      "it according to FMS usage reporting.")
-  explicit GearTooth(std::shared_ptr<DigitalSource> source,
-                     bool directionSensitive = false);
-
-  GearTooth(GearTooth&&) = default;
-  GearTooth& operator=(GearTooth&&) = default;
-
-  /**
-   * Common code called by the constructors.
-   */
-  void EnableDirectionSensing(bool directionSensitive);
-
-  void InitSendable(SendableBuilder& builder) override;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/GenericHID.h b/wpilibc/src/main/native/include/frc/GenericHID.h
index 001b984..b6c18d3 100644
--- a/wpilibc/src/main/native/include/frc/GenericHID.h
+++ b/wpilibc/src/main/native/include/frc/GenericHID.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -11,16 +8,19 @@
 
 #include <string>
 
-#include "frc/ErrorBase.h"
-
 namespace frc {
 
 class DriverStation;
 
 /**
- * GenericHID Interface.
+ * Handle input from standard HID devices connected to the Driver Station.
+ *
+ * <p>This class handles standard input that comes from the Driver Station. Each
+ * time a value is requested the most recent value is returned. There is a
+ * single class instance for each device and the mapping of ports to hardware
+ * buttons depends on the code in the Driver Station.
  */
-class GenericHID : public ErrorBase {
+class GenericHID {
  public:
   enum RumbleType { kLeftRumble, kRightRumble };
 
@@ -44,17 +44,12 @@
     kHID1stPerson = 24
   };
 
-  enum JoystickHand { kLeftHand = 0, kRightHand = 1 };
-
   explicit GenericHID(int port);
   virtual ~GenericHID() = default;
 
   GenericHID(GenericHID&&) = default;
   GenericHID& operator=(GenericHID&&) = default;
 
-  virtual double GetX(JoystickHand hand = kRightHand) const = 0;
-  virtual double GetY(JoystickHand hand = kRightHand) const = 0;
-
   /**
    * Get the button value (starting at button 1).
    *
@@ -71,7 +66,7 @@
   bool GetRawButton(int button) const;
 
   /**
-   * Whether the button was pressed since the last check. Button indexes begin
+   * Whether the button was pressed since the last check. %Button indexes begin
    * at 1.
    *
    * This method returns true if the button went from not pressed to held down
@@ -84,7 +79,7 @@
   bool GetRawButtonPressed(int button);
 
   /**
-   * Whether the button was released since the last check. Button indexes begin
+   * Whether the button was released since the last check. %Button indexes begin
    * at 1.
    *
    * This method returns true if the button went from held down to not pressed
@@ -197,7 +192,6 @@
   void SetRumble(RumbleType type, double value);
 
  private:
-  DriverStation* m_ds;
   int m_port;
   int m_outputs = 0;
   uint16_t m_leftRumble = 0;
diff --git a/wpilibc/src/main/native/include/frc/GyroBase.h b/wpilibc/src/main/native/include/frc/GyroBase.h
deleted file mode 100644
index 037686f..0000000
--- a/wpilibc/src/main/native/include/frc/GyroBase.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/ErrorBase.h"
-#include "frc/PIDSource.h"
-#include "frc/interfaces/Gyro.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
-
-namespace frc {
-
-/**
- * GyroBase is the common base class for Gyro implementations such as
- * AnalogGyro.
- */
-class GyroBase : public Gyro,
-                 public ErrorBase,
-                 public PIDSource,
-                 public Sendable,
-                 public SendableHelper<GyroBase> {
- public:
-  GyroBase() = default;
-  GyroBase(GyroBase&&) = default;
-  GyroBase& operator=(GyroBase&&) = default;
-
-  // PIDSource interface
-  /**
-   * Get the PIDOutput for the PIDSource base object. Can be set to return
-   * angle or rate using SetPIDSourceType(). Defaults to angle.
-   *
-   * @return The PIDOutput (angle or rate, defaults to angle)
-   */
-  double PIDGet() override;
-
-  void InitSendable(SendableBuilder& builder) override;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/I2C.h b/wpilibc/src/main/native/include/frc/I2C.h
index 2f12615..d874a46 100644
--- a/wpilibc/src/main/native/include/frc/I2C.h
+++ b/wpilibc/src/main/native/include/frc/I2C.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -11,8 +8,6 @@
 
 #include <hal/I2CTypes.h>
 
-#include "frc/ErrorBase.h"
-
 namespace frc {
 
 /**
@@ -21,7 +16,7 @@
  * This class is intended to be used by sensor (and other I2C device) drivers.
  * It probably should not be used directly.
  */
-class I2C : public ErrorBase {
+class I2C {
  public:
   enum Port { kOnboard = 0, kMXP };
 
@@ -33,11 +28,14 @@
    */
   I2C(Port port, int deviceAddress);
 
-  ~I2C() override;
+  ~I2C();
 
   I2C(I2C&&) = default;
   I2C& operator=(I2C&&) = default;
 
+  Port GetPort() const;
+  int GetDeviceAddress() const;
+
   /**
    * Generic transaction.
    *
@@ -100,7 +98,7 @@
    *
    * @param registerAddress The register to read first in the transaction.
    * @param count           The number of bytes to read in the transaction.
-   * @param buffer          A pointer to the array of bytes to store the data
+   * @param data            A pointer to the array of bytes to store the data
    *                        read from the device.
    * @return Transfer Aborted... false for success, true for aborted.
    */
diff --git a/wpilibc/src/main/native/include/frc/InterruptableSensorBase.h b/wpilibc/src/main/native/include/frc/InterruptableSensorBase.h
deleted file mode 100644
index 42b7434..0000000
--- a/wpilibc/src/main/native/include/frc/InterruptableSensorBase.h
+++ /dev/null
@@ -1,151 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <functional>
-#include <memory>
-
-#include <hal/Interrupts.h>
-
-#include "frc/AnalogTriggerType.h"
-#include "frc/ErrorBase.h"
-
-namespace frc {
-
-class InterruptableSensorBase : public ErrorBase {
- public:
-  enum WaitResult {
-    kTimeout = 0x0,
-    kRisingEdge = 0x1,
-    kFallingEdge = 0x100,
-    kBoth = 0x101,
-  };
-
-  /**
-   * Handler for interrupts.
-   *
-   * First parameter is if rising, 2nd is if falling.
-   */
-  using InterruptEventHandler = std::function<void(WaitResult)>;
-
-  InterruptableSensorBase() = default;
-
-  /**
-   * Free the resources for an interrupt event.
-   */
-  virtual ~InterruptableSensorBase();
-
-  InterruptableSensorBase(InterruptableSensorBase&&) = default;
-  InterruptableSensorBase& operator=(InterruptableSensorBase&&) = default;
-
-  virtual HAL_Handle GetPortHandleForRouting() const = 0;
-  virtual AnalogTriggerType GetAnalogTriggerTypeForRouting() const = 0;
-
-  /**
-   * Request one of the 8 interrupts asynchronously on this digital input.
-   *
-   * Request interrupts in asynchronous mode where the user's interrupt handler
-   * will be called when the interrupt fires. Users that want control over the
-   * thread priority should use the synchronous method with their own spawned
-   * thread. The default is interrupt on rising edges only.
-   */
-  virtual void RequestInterrupts(HAL_InterruptHandlerFunction handler,
-                                 void* param);
-
-  /**
-   * Request one of the 8 interrupts asynchronously on this digital input.
-   *
-   * Request interrupts in asynchronous mode where the user's interrupt handler
-   * will be called when the interrupt fires. Users that want control over the
-   * thread priority should use the synchronous method with their own spawned
-   * thread. The default is interrupt on rising edges only.
-   */
-  virtual void RequestInterrupts(InterruptEventHandler handler);
-
-  /**
-   * Request one of the 8 interrupts synchronously on this digital input.
-   *
-   * Request interrupts in synchronous mode where the user program will have to
-   * explicitly wait for the interrupt to occur using WaitForInterrupt.
-   * The default is interrupt on rising edges only.
-   */
-  virtual void RequestInterrupts();
-
-  /**
-   * Cancel interrupts on this device.
-   *
-   * This deallocates all the chipobject structures and disables any interrupts.
-   */
-  virtual void CancelInterrupts();
-
-  /**
-   * In synchronous mode, wait for the defined interrupt to occur.
-   *
-   * You should <b>NOT</b> attempt to read the sensor from another thread while
-   * waiting for an interrupt. This is not threadsafe, and can cause memory
-   * corruption
-   *
-   * @param timeout        Timeout in seconds
-   * @param ignorePrevious If true, ignore interrupts that happened before
-   *                       WaitForInterrupt was called.
-   * @return What interrupts fired
-   */
-  virtual WaitResult WaitForInterrupt(double timeout,
-                                      bool ignorePrevious = true);
-
-  /**
-   * Enable interrupts to occur on this input.
-   *
-   * Interrupts are disabled when the RequestInterrupt call is made. This gives
-   * time to do the setup of the other options before starting to field
-   * interrupts.
-   */
-  virtual void EnableInterrupts();
-
-  /**
-   * Disable Interrupts without without deallocating structures.
-   */
-  virtual void DisableInterrupts();
-
-  /**
-   * Return the timestamp for the rising interrupt that occurred most recently.
-   *
-   * This is in the same time domain as GetClock(). The rising-edge interrupt
-   * should be enabled with SetUpSourceEdge().
-   *
-   * @return Timestamp in seconds since boot.
-   */
-  virtual double ReadRisingTimestamp();
-
-  /**
-   * Return the timestamp for the falling interrupt that occurred most recently.
-   *
-   * This is in the same time domain as GetClock().
-   * The falling-edge interrupt should be enabled with
-   * {@link #DigitalInput.SetUpSourceEdge}
-   *
-   * @return Timestamp in seconds since boot.
-   */
-  virtual double ReadFallingTimestamp();
-
-  /**
-   * Set which edge to trigger interrupts on
-   *
-   * @param risingEdge  true to interrupt on rising edge
-   * @param fallingEdge true to interrupt on falling edge
-   */
-  virtual void SetUpSourceEdge(bool risingEdge, bool fallingEdge);
-
- protected:
-  hal::Handle<HAL_InterruptHandle> m_interrupt;
-  std::unique_ptr<InterruptEventHandler> m_interruptHandler{nullptr};
-
-  void AllocateInterrupts(bool watcher);
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/IterativeRobot.h b/wpilibc/src/main/native/include/frc/IterativeRobot.h
deleted file mode 100644
index 24fdba3..0000000
--- a/wpilibc/src/main/native/include/frc/IterativeRobot.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <atomic>
-
-#include "frc/IterativeRobotBase.h"
-
-namespace frc {
-
-/**
- * IterativeRobot implements the IterativeRobotBase robot program framework.
- *
- * The IterativeRobot class is intended to be subclassed by a user creating a
- * robot program.
- *
- * Periodic() functions from the base class are called each time a new packet is
- * received from the driver station.
- *
- * @deprecated Use TimedRobot instead. It's a drop-in replacement that provides
- * more regular execution periods.
- */
-class IterativeRobot : public IterativeRobotBase {
- public:
-  WPI_DEPRECATED(
-      "Use TimedRobot instead. It's a drop-in replacement that provides more "
-      "regular execution periods.")
-  IterativeRobot();
-  virtual ~IterativeRobot() = default;
-
-  /**
-   * Provide an alternate "main loop" via StartCompetition().
-   *
-   * This specific StartCompetition() implements "main loop" behavior synced
-   * with the DS packets.
-   */
-  void StartCompetition() override;
-
-  /**
-   * Ends the main loop in StartCompetition().
-   */
-  void EndCompetition() override;
-
- private:
-  std::atomic<bool> m_exit{false};
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/IterativeRobotBase.h b/wpilibc/src/main/native/include/frc/IterativeRobotBase.h
index 66897aa..c4253ef 100644
--- a/wpilibc/src/main/native/include/frc/IterativeRobotBase.h
+++ b/wpilibc/src/main/native/include/frc/IterativeRobotBase.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -28,22 +25,32 @@
  * RobotInit() -- provide for initialization at robot power-on
  *
  * Init() functions -- each of the following functions is called once when the
- *                     appropriate mode is entered:
- *   - DisabledInit()   -- called each and every time disabled is entered from
- *                         another mode
- *   - AutonomousInit() -- called each and every time autonomous is entered from
- *                         another mode
- *   - TeleopInit()     -- called each and every time teleop is entered from
- *                         another mode
- *   - TestInit()       -- called each and every time test is entered from
- *                         another mode
+ * appropriate mode is entered:
+ *
+ * \li DisabledInit() -- called each and every time disabled is entered from
+ *   another mode
+ * \li AutonomousInit() -- called each and every time autonomous is entered from
+ *   another mode
+ * \li TeleopInit() -- called each and every time teleop is entered from another
+ *   mode
+ * \li TestInit() -- called each and every time test is entered from another
+ *   mode
  *
  * Periodic() functions -- each of these functions is called on an interval:
- *   - RobotPeriodic()
- *   - DisabledPeriodic()
- *   - AutonomousPeriodic()
- *   - TeleopPeriodic()
- *   - TestPeriodic()
+ *
+ * \li RobotPeriodic()
+ * \li DisabledPeriodic()
+ * \li AutonomousPeriodic()
+ * \li TeleopPeriodic()
+ * \li TestPeriodic()
+ *
+ * Exit() functions -- each of the following functions is called once when the
+ * appropriate mode is exited:
+ *
+ * \li DisabledExit() -- called each and every time disabled is exited
+ * \li AutonomousExit() -- called each and every time autonomous is exited
+ * \li TeleopExit() -- called each and every time teleop is exited
+ * \li TestExit() -- called each and every time test is exited
  */
 class IterativeRobotBase : public RobotBase {
  public:
@@ -156,6 +163,51 @@
   virtual void TestPeriodic();
 
   /**
+   * Exit code for disabled mode should go here.
+   *
+   * Users should override this method for code which will be called each time
+   * the robot exits disabled mode.
+   */
+  virtual void DisabledExit();
+
+  /**
+   * Exit code for autonomous mode should go here.
+   *
+   * Users should override this method for code which will be called each time
+   * the robot exits autonomous mode.
+   */
+  virtual void AutonomousExit();
+
+  /**
+   * Exit code for teleop mode should go here.
+   *
+   * Users should override this method for code which will be called each time
+   * the robot exits teleop mode.
+   */
+  virtual void TeleopExit();
+
+  /**
+   * Exit code for test mode should go here.
+   *
+   * Users should override this method for code which will be called each time
+   * the robot exits test mode.
+   */
+  virtual void TestExit();
+
+  /**
+   * Enables or disables flushing NetworkTables every loop iteration.
+   * By default, this is disabled.
+   *
+   * @param enabled True to enable, false to disable
+   */
+  void SetNetworkTablesFlushEnabled(bool enabled);
+
+  /**
+   * Gets time period between calls to Periodic() functions.
+   */
+  units::second_t GetPeriod() const;
+
+  /**
    * Constructor for IterativeRobotBase.
    *
    * @param period Period in seconds.
@@ -173,7 +225,7 @@
    */
   explicit IterativeRobotBase(units::second_t period);
 
-  virtual ~IterativeRobotBase() = default;
+  ~IterativeRobotBase() override = default;
 
  protected:
   IterativeRobotBase(IterativeRobotBase&&) = default;
@@ -181,13 +233,13 @@
 
   void LoopFunc();
 
-  units::second_t m_period;
-
  private:
   enum class Mode { kNone, kDisabled, kAutonomous, kTeleop, kTest };
 
   Mode m_lastMode = Mode::kNone;
+  units::second_t m_period;
   Watchdog m_watchdog;
+  bool m_ntFlushEnabled = false;
 
   void PrintLoopOverrunMessage();
 };
diff --git a/wpilibc/src/main/native/include/frc/Joystick.h b/wpilibc/src/main/native/include/frc/Joystick.h
index 0975e6d..0d63e4e 100644
--- a/wpilibc/src/main/native/include/frc/Joystick.h
+++ b/wpilibc/src/main/native/include/frc/Joystick.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -42,7 +39,7 @@
    */
   explicit Joystick(int port);
 
-  virtual ~Joystick() = default;
+  ~Joystick() override = default;
 
   Joystick(Joystick&&) = default;
   Joystick& operator=(Joystick&&) = default;
@@ -57,7 +54,6 @@
   /**
    * Set the channel associated with the Y axis.
    *
-   * @param axis    The axis to set the channel for.
    * @param channel The channel to set the axis to.
    */
   void SetYChannel(int channel);
@@ -65,7 +61,6 @@
   /**
    * Set the channel associated with the Z axis.
    *
-   * @param axis    The axis to set the channel for.
    * @param channel The channel to set the axis to.
    */
   void SetZChannel(int channel);
@@ -73,7 +68,6 @@
   /**
    * Set the channel associated with the twist axis.
    *
-   * @param axis    The axis to set the channel for.
    * @param channel The channel to set the axis to.
    */
   void SetTwistChannel(int channel);
@@ -81,7 +75,6 @@
   /**
    * Set the channel associated with the throttle axis.
    *
-   * @param axis    The axis to set the channel for.
    * @param channel The channel to set the axis to.
    */
   void SetThrottleChannel(int channel);
@@ -122,24 +115,18 @@
   int GetThrottleChannel() const;
 
   /**
-   * Get the X value of the joystick.
+   * Get the X value of the current joystick.
    *
    * This depends on the mapping of the joystick connected to the current port.
-   *
-   * @param hand This parameter is ignored for the Joystick class and is only
-   *             here to complete the GenericHID interface.
    */
-  double GetX(JoystickHand hand = kRightHand) const override;
+  double GetX() const;
 
   /**
-   * Get the Y value of the joystick.
+   * Get the Y value of the current joystick.
    *
    * This depends on the mapping of the joystick connected to the current port.
-   *
-   * @param hand This parameter is ignored for the Joystick class and is only
-   *             here to complete the GenericHID interface.
    */
-  double GetY(JoystickHand hand = kRightHand) const override;
+  double GetY() const;
 
   /**
    * Get the Z value of the current joystick.
diff --git a/wpilibc/src/main/native/include/frc/MotorSafety.h b/wpilibc/src/main/native/include/frc/MotorSafety.h
index afd0853..f84af17 100644
--- a/wpilibc/src/main/native/include/frc/MotorSafety.h
+++ b/wpilibc/src/main/native/include/frc/MotorSafety.h
@@ -1,16 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/mutex.h>
-#include <wpi/raw_ostream.h>
+#include <string>
 
-#include "frc/ErrorBase.h"
+#include <units/time.h>
+#include <wpi/mutex.h>
+
 #include "frc/Timer.h"
 
 namespace frc {
@@ -21,7 +19,7 @@
  *
  * The subclass should call Feed() whenever the motor value is updated.
  */
-class MotorSafety : public ErrorBase {
+class MotorSafety {
  public:
   MotorSafety();
   virtual ~MotorSafety();
@@ -39,16 +37,16 @@
   /**
    * Set the expiration time for the corresponding motor safety object.
    *
-   * @param expirationTime The timeout value in seconds.
+   * @param expirationTime The timeout value.
    */
-  void SetExpiration(double expirationTime);
+  void SetExpiration(units::second_t expirationTime);
 
   /**
    * Retrieve the timeout value for the corresponding motor safety object.
    *
-   * @return the timeout value in seconds.
+   * @return the timeout value.
    */
-  double GetExpiration() const;
+  units::second_t GetExpiration() const;
 
   /**
    * Determine if the motor is still operating or has timed out.
@@ -93,19 +91,19 @@
   static void CheckMotors();
 
   virtual void StopMotor() = 0;
-  virtual void GetDescription(wpi::raw_ostream& desc) const = 0;
+  virtual std::string GetDescription() const = 0;
 
  private:
-  static constexpr double kDefaultSafetyExpiration = 0.1;
+  static constexpr auto kDefaultSafetyExpiration = 100_ms;
 
   // The expiration time for this object
-  double m_expiration = kDefaultSafetyExpiration;
+  units::second_t m_expiration = kDefaultSafetyExpiration;
 
   // True if motor safety is enabled for this motor
   bool m_enabled = false;
 
   // The FPGA clock value when the motor has expired
-  double m_stopTime = Timer::GetFPGATimestamp();
+  units::second_t m_stopTime = Timer::GetFPGATimestamp();
 
   mutable wpi::mutex m_thisMutex;
 };
diff --git a/wpilibc/src/main/native/include/frc/Notifier.h b/wpilibc/src/main/native/include/frc/Notifier.h
index c9348a6..61b7fbb 100644
--- a/wpilibc/src/main/native/include/frc/Notifier.h
+++ b/wpilibc/src/main/native/include/frc/Notifier.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -11,21 +8,18 @@
 
 #include <atomic>
 #include <functional>
+#include <string_view>
 #include <thread>
 #include <type_traits>
 #include <utility>
 
 #include <hal/Types.h>
 #include <units/time.h>
-#include <wpi/Twine.h>
-#include <wpi/deprecated.h>
 #include <wpi/mutex.h>
 
-#include "frc/ErrorBase.h"
-
 namespace frc {
 
-class Notifier : public ErrorBase {
+class Notifier {
  public:
   /**
    * Create a Notifier for timer event notification.
@@ -49,8 +43,9 @@
    * This is useful for reducing scheduling jitter on processes which are
    * sensitive to timing variance, like model-based control.
    *
-   * @param priority The FIFO real-time scheduler priority ([0..100] where a
-   *                 lower number represents higher priority).
+   * @param priority The FIFO real-time scheduler priority ([1..99] where a
+   *                 higher number represents higher priority). See "man 7
+   *                 sched" for more details.
    * @param handler  The handler is called at the notification time which is set
    *                 using StartSingle or StartPeriodic.
    */
@@ -65,7 +60,7 @@
   /**
    * Free the resources for a timer event.
    */
-  virtual ~Notifier();
+  ~Notifier();
 
   Notifier(Notifier&& rhs);
   Notifier& operator=(Notifier&& rhs);
@@ -75,7 +70,7 @@
    *
    * @param name Name
    */
-  void SetName(const wpi::Twine& name);
+  void SetName(std::string_view name);
 
   /**
    * Change the handler function.
@@ -89,19 +84,6 @@
    *
    * A timer event is queued for a single event after the specified delay.
    *
-   * @deprecated Use unit-safe StartSingle(units::second_t delay) method
-   * instead.
-   *
-   * @param delay Seconds to wait before the handler is called.
-   */
-  WPI_DEPRECATED("Use unit-safe StartSingle method instead.")
-  void StartSingle(double delay);
-
-  /**
-   * Register for single event notification.
-   *
-   * A timer event is queued for a single event after the specified delay.
-   *
    * @param delay Amount of time to wait before the handler is called.
    */
   void StartSingle(units::second_t delay);
@@ -113,22 +95,6 @@
    * interrupt occurs, the event will be immediately requeued for the same time
    * interval.
    *
-   * @deprecated Use unit-safe StartPeriodic(units::second_t period) method
-   * instead
-   *
-   * @param period Period in seconds to call the handler starting one period
-   *               after the call to this method.
-   */
-  WPI_DEPRECATED("Use unit-safe StartPeriodic method instead.")
-  void StartPeriodic(double period);
-
-  /**
-   * Register for periodic event notification.
-   *
-   * A timer event is queued for periodic event notification. Each time the
-   * interrupt occurs, the event will be immediately requeued for the same time
-   * interval.
-   *
    * @param period Period to call the handler starting one period
    *               after the call to this method.
    */
@@ -145,6 +111,23 @@
    */
   void Stop();
 
+  /**
+   * Sets the HAL notifier thread priority.
+   *
+   * The HAL notifier thread is responsible for managing the FPGA's notifier
+   * interrupt and waking up user's Notifiers when it's their time to run.
+   * Giving the HAL notifier thread real-time priority helps ensure the user's
+   * real-time Notifiers, if any, are notified to run in a timely manner.
+   *
+   * @param realTime Set to true to set a real-time priority, false for standard
+   *                 priority.
+   * @param priority Priority to set the thread to. For real-time, this is 1-99
+   *                 with 99 being highest. For non-real-time, this is forced to
+   *                 0. See "man 7 sched" for more details.
+   * @return         True on success.
+   */
+  static bool SetHALThreadPriority(bool realTime, int32_t priority);
+
  private:
   /**
    * Update the HAL alarm time.
@@ -171,10 +154,10 @@
   std::function<void()> m_handler;
 
   // The absolute expiration time
-  double m_expirationTime = 0;
+  units::second_t m_expirationTime = 0_s;
 
   // The relative time (either periodic or single)
-  double m_period = 0;
+  units::second_t m_period = 0_s;
 
   // True if this is a periodic event
   bool m_periodic = false;
diff --git a/wpilibc/src/main/native/include/frc/PIDBase.h b/wpilibc/src/main/native/include/frc/PIDBase.h
deleted file mode 100644
index 79d8eba..0000000
--- a/wpilibc/src/main/native/include/frc/PIDBase.h
+++ /dev/null
@@ -1,410 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <wpi/deprecated.h>
-#include <wpi/mutex.h>
-
-#include "frc/Base.h"
-#include "frc/LinearFilter.h"
-#include "frc/PIDInterface.h"
-#include "frc/PIDOutput.h"
-#include "frc/PIDSource.h"
-#include "frc/Timer.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
-
-namespace frc {
-
-class SendableBuilder;
-
-/**
- * Class implements a PID Control Loop.
- *
- * Creates a separate thread which reads the given PIDSource and takes care of
- * the integral calculations, as well as writing the given PIDOutput.
- *
- * This feedback controller runs in discrete time, so time deltas are not used
- * in the integral and derivative calculations. Therefore, the sample rate
- * affects the controller's behavior for a given set of PID constants.
- *
- * @deprecated All APIs which use this have been deprecated.
- */
-class PIDBase : public PIDInterface,
-                public PIDOutput,
-                public Sendable,
-                public SendableHelper<PIDBase> {
- public:
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   */
-  WPI_DEPRECATED("All APIs which use this have been deprecated.")
-  PIDBase(double p, double i, double d, PIDSource& source, PIDOutput& output);
-
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   */
-  WPI_DEPRECATED("All APIs which use this have been deprecated.")
-  PIDBase(double p, double i, double d, double f, PIDSource& source,
-          PIDOutput& output);
-
-  virtual ~PIDBase() = default;
-
-  /**
-   * Return the current PID result.
-   *
-   * This is always centered on zero and constrained the the max and min outs.
-   *
-   * @return the latest calculated output
-   */
-  virtual double Get() const;
-
-  /**
-   * Set the PID controller to consider the input to be continuous,
-   *
-   * Rather then using the max and min input range as constraints, it considers
-   * them to be the same point and automatically calculates the shortest route
-   * to the setpoint.
-   *
-   * @param continuous true turns on continuous, false turns off continuous
-   */
-  virtual void SetContinuous(bool continuous = true);
-
-  /**
-   * Sets the maximum and minimum values expected from the input.
-   *
-   * @param minimumInput the minimum value expected from the input
-   * @param maximumInput the maximum value expected from the output
-   */
-  virtual void SetInputRange(double minimumInput, double maximumInput);
-
-  /**
-   * Sets the minimum and maximum values to write.
-   *
-   * @param minimumOutput the minimum value to write to the output
-   * @param maximumOutput the maximum value to write to the output
-   */
-  virtual void SetOutputRange(double minimumOutput, double maximumOutput);
-
-  /**
-   * Set the PID Controller gain parameters.
-   *
-   * Set the proportional, integral, and differential coefficients.
-   *
-   * @param p Proportional coefficient
-   * @param i Integral coefficient
-   * @param d Differential coefficient
-   */
-  void SetPID(double p, double i, double d) override;
-
-  /**
-   * Set the PID Controller gain parameters.
-   *
-   * Set the proportional, integral, and differential coefficients.
-   *
-   * @param p Proportional coefficient
-   * @param i Integral coefficient
-   * @param d Differential coefficient
-   * @param f Feed forward coefficient
-   */
-  virtual void SetPID(double p, double i, double d, double f);
-
-  /**
-   * Set the Proportional coefficient of the PID controller gain.
-   *
-   * @param p proportional coefficient
-   */
-  void SetP(double p);
-
-  /**
-   * Set the Integral coefficient of the PID controller gain.
-   *
-   * @param i integral coefficient
-   */
-  void SetI(double i);
-
-  /**
-   * Set the Differential coefficient of the PID controller gain.
-   *
-   * @param d differential coefficient
-   */
-  void SetD(double d);
-
-  /**
-   * Get the Feed forward coefficient of the PID controller gain.
-   *
-   * @param f Feed forward coefficient
-   */
-  void SetF(double f);
-
-  /**
-   * Get the Proportional coefficient.
-   *
-   * @return proportional coefficient
-   */
-  double GetP() const override;
-
-  /**
-   * Get the Integral coefficient.
-   *
-   * @return integral coefficient
-   */
-  double GetI() const override;
-
-  /**
-   * Get the Differential coefficient.
-   *
-   * @return differential coefficient
-   */
-  double GetD() const override;
-
-  /**
-   * Get the Feed forward coefficient.
-   *
-   * @return Feed forward coefficient
-   */
-  virtual double GetF() const;
-
-  /**
-   * Set the setpoint for the PIDBase.
-   *
-   * @param setpoint the desired setpoint
-   */
-  void SetSetpoint(double setpoint) override;
-
-  /**
-   * Returns the current setpoint of the PIDBase.
-   *
-   * @return the current setpoint
-   */
-  double GetSetpoint() const override;
-
-  /**
-   * Returns the change in setpoint over time of the PIDBase.
-   *
-   * @return the change in setpoint over time
-   */
-  double GetDeltaSetpoint() const;
-
-  /**
-   * Returns the current difference of the input from the setpoint.
-   *
-   * @return the current error
-   */
-  virtual double GetError() const;
-
-  /**
-   * Returns the current average of the error over the past few iterations.
-   *
-   * You can specify the number of iterations to average with
-   * SetToleranceBuffer() (defaults to 1). This is the same value that is used
-   * for OnTarget().
-   *
-   * @return the average error
-   */
-  WPI_DEPRECATED("Use a LinearFilter as the input and GetError().")
-  virtual double GetAvgError() const;
-
-  /**
-   * Sets what type of input the PID controller will use.
-   */
-  virtual void SetPIDSourceType(PIDSourceType pidSource);
-
-  /**
-   * Returns the type of input the PID controller is using.
-   *
-   * @return the PID controller input type
-   */
-  virtual PIDSourceType GetPIDSourceType() const;
-
-  /**
-   * Set the percentage error which is considered tolerable for use with
-   * OnTarget.
-   *
-   * @param percentage error which is tolerable
-   */
-  WPI_DEPRECATED("Use SetPercentTolerance() instead.")
-  virtual void SetTolerance(double percent);
-
-  /**
-   * Set the absolute error which is considered tolerable for use with
-   * OnTarget.
-   *
-   * @param percentage error which is tolerable
-   */
-  virtual void SetAbsoluteTolerance(double absValue);
-
-  /**
-   * Set the percentage error which is considered tolerable for use with
-   * OnTarget.
-   *
-   * @param percentage error which is tolerable
-   */
-  virtual void SetPercentTolerance(double percentValue);
-
-  /**
-   * Set the number of previous error samples to average for tolerancing. When
-   * determining whether a mechanism is on target, the user may want to use a
-   * rolling average of previous measurements instead of a precise position or
-   * velocity. This is useful for noisy sensors which return a few erroneous
-   * measurements when the mechanism is on target. However, the mechanism will
-   * not register as on target for at least the specified bufLength cycles.
-   *
-   * @param bufLength Number of previous cycles to average. Defaults to 1.
-   */
-  WPI_DEPRECATED("Use a LinearDigitalFilter as the input.")
-  virtual void SetToleranceBuffer(int buf = 1);
-
-  /**
-   * Return true if the error is within the percentage of the total input range,
-   * determined by SetTolerance. This asssumes that the maximum and minimum
-   * input were set using SetInput.
-   *
-   * Currently this just reports on target as the actual value passes through
-   * the setpoint. Ideally it should be based on being within the tolerance for
-   * some period of time.
-   *
-   * This will return false until at least one input value has been computed.
-   */
-  virtual bool OnTarget() const;
-
-  /**
-   * Reset the previous error, the integral term, and disable the controller.
-   */
-  void Reset() override;
-
-  /**
-   * Passes the output directly to SetSetpoint().
-   *
-   * PIDControllers can be nested by passing a PIDController as another
-   * PIDController's output. In that case, the output of the parent controller
-   * becomes the input (i.e., the reference) of the child.
-   *
-   * It is the caller's responsibility to put the data into a valid form for
-   * SetSetpoint().
-   */
-  void PIDWrite(double output) override;
-
-  void InitSendable(SendableBuilder& builder) override;
-
- protected:
-  // Is the pid controller enabled
-  bool m_enabled = false;
-
-  mutable wpi::mutex m_thisMutex;
-
-  // Ensures when Disable() is called, PIDWrite() won't run if Calculate()
-  // is already running at that time.
-  mutable wpi::mutex m_pidWriteMutex;
-
-  PIDSource* m_pidInput;
-  PIDOutput* m_pidOutput;
-  Timer m_setpointTimer;
-
-  /**
-   * Read the input, calculate the output accordingly, and write to the output.
-   * This should only be called by the Notifier.
-   */
-  virtual void Calculate();
-
-  /**
-   * Calculate the feed forward term.
-   *
-   * Both of the provided feed forward calculations are velocity feed forwards.
-   * If a different feed forward calculation is desired, the user can override
-   * this function and provide his or her own. This function does no
-   * synchronization because the PIDBase class only calls it in synchronized
-   * code, so be careful if calling it oneself.
-   *
-   * If a velocity PID controller is being used, the F term should be set to 1
-   * over the maximum setpoint for the output. If a position PID controller is
-   * being used, the F term should be set to 1 over the maximum speed for the
-   * output measured in setpoint units per this controller's update period (see
-   * the default period in this class's constructor).
-   */
-  virtual double CalculateFeedForward();
-
-  /**
-   * Wraps error around for continuous inputs. The original error is returned if
-   * continuous mode is disabled. This is an unsynchronized function.
-   *
-   * @param error The current error of the PID controller.
-   * @return Error for continuous inputs.
-   */
-  double GetContinuousError(double error) const;
-
- private:
-  // Factor for "proportional" control
-  double m_P;
-
-  // Factor for "integral" control
-  double m_I;
-
-  // Factor for "derivative" control
-  double m_D;
-
-  // Factor for "feed forward" control
-  double m_F;
-
-  // |maximum output|
-  double m_maximumOutput = 1.0;
-
-  // |minimum output|
-  double m_minimumOutput = -1.0;
-
-  // Maximum input - limit setpoint to this
-  double m_maximumInput = 0;
-
-  // Minimum input - limit setpoint to this
-  double m_minimumInput = 0;
-
-  // input range - difference between maximum and minimum
-  double m_inputRange = 0;
-
-  // Do the endpoints wrap around? eg. Absolute encoder
-  bool m_continuous = false;
-
-  // The prior error (used to compute velocity)
-  double m_prevError = 0;
-
-  // The sum of the errors for use in the integral calc
-  double m_totalError = 0;
-
-  enum {
-    kAbsoluteTolerance,
-    kPercentTolerance,
-    kNoTolerance
-  } m_toleranceType = kNoTolerance;
-
-  // The percetage or absolute error that is considered on target.
-  double m_tolerance = 0.05;
-
-  double m_setpoint = 0;
-  double m_prevSetpoint = 0;
-  double m_error = 0;
-  double m_result = 0;
-
-  LinearFilter<double> m_filter{{}, {}};
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PIDController.h b/wpilibc/src/main/native/include/frc/PIDController.h
deleted file mode 100644
index 39e4deb..0000000
--- a/wpilibc/src/main/native/include/frc/PIDController.h
+++ /dev/null
@@ -1,139 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <wpi/deprecated.h>
-#include <wpi/mutex.h>
-
-#include "frc/Base.h"
-#include "frc/Controller.h"
-#include "frc/Notifier.h"
-#include "frc/PIDBase.h"
-#include "frc/PIDSource.h"
-#include "frc/Timer.h"
-
-namespace frc {
-
-class PIDOutput;
-
-/**
- * Class implements a PID Control Loop.
- *
- * Creates a separate thread which reads the given PIDSource and takes care of
- * the integral calculations, as well as writing the given PIDOutput.
- *
- * This feedback controller runs in discrete time, so time deltas are not used
- * in the integral and derivative calculations. Therefore, the sample rate
- * affects the controller's behavior for a given set of PID constants.
- *
- * @deprecated Use frc2::PIDController class instead.
- */
-class PIDController : public PIDBase, public Controller {
- public:
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   * @param period the loop time for doing calculations in seconds. This
-   *               particularly affects calculations of the integral and
-   *               differential terms. The default is 0.05 (50ms).
-   */
-  WPI_DEPRECATED("Use frc2::PIDController class instead.")
-  PIDController(double p, double i, double d, PIDSource* source,
-                PIDOutput* output, double period = 0.05);
-
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   * @param period the loop time for doing calculations in seconds. This
-   *               particularly affects calculations of the integral and
-   *               differential terms. The default is 0.05 (50ms).
-   */
-  WPI_DEPRECATED("Use frc2::PIDController class instead.")
-  PIDController(double p, double i, double d, double f, PIDSource* source,
-                PIDOutput* output, double period = 0.05);
-
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   * @param period the loop time for doing calculations in seconds. This
-   *               particularly affects calculations of the integral and
-   *               differential terms. The default is 0.05 (50ms).
-   */
-  WPI_DEPRECATED("Use frc2::PIDController class instead.")
-  PIDController(double p, double i, double d, PIDSource& source,
-                PIDOutput& output, double period = 0.05);
-
-  /**
-   * Allocate a PID object with the given constants for P, I, D.
-   *
-   * @param Kp     the proportional coefficient
-   * @param Ki     the integral coefficient
-   * @param Kd     the derivative coefficient
-   * @param source The PIDSource object that is used to get values
-   * @param output The PIDOutput object that is set to the output value
-   * @param period the loop time for doing calculations in seconds. This
-   *               particularly affects calculations of the integral and
-   *               differential terms. The default is 0.05 (50ms).
-   */
-  WPI_DEPRECATED("Use frc2::PIDController class instead.")
-  PIDController(double p, double i, double d, double f, PIDSource& source,
-                PIDOutput& output, double period = 0.05);
-
-  ~PIDController() override;
-
-  /**
-   * Begin running the PIDController.
-   */
-  void Enable() override;
-
-  /**
-   * Stop running the PIDController, this sets the output to zero before
-   * stopping.
-   */
-  void Disable() override;
-
-  /**
-   * Set the enabled state of the PIDController.
-   */
-  void SetEnabled(bool enable);
-
-  /**
-   * Return true if PIDController is enabled.
-   */
-  bool IsEnabled() const;
-
-  /**
-   * Reset the previous error, the integral term, and disable the controller.
-   */
-  void Reset() override;
-
-  void InitSendable(SendableBuilder& builder) override;
-
- private:
-  std::unique_ptr<Notifier> m_controlLoop;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PIDInterface.h b/wpilibc/src/main/native/include/frc/PIDInterface.h
deleted file mode 100644
index 8d847a6..0000000
--- a/wpilibc/src/main/native/include/frc/PIDInterface.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <wpi/deprecated.h>
-
-namespace frc {
-
-/**
- * Interface for PID Control Loop.
- *
- * @deprecated All APIs which use this have been deprecated.
- */
-class PIDInterface {
- public:
-  WPI_DEPRECATED("All APIs which use this have been deprecated.")
-  PIDInterface() = default;
-  PIDInterface(PIDInterface&&) = default;
-  PIDInterface& operator=(PIDInterface&&) = default;
-
-  virtual void SetPID(double p, double i, double d) = 0;
-  virtual double GetP() const = 0;
-  virtual double GetI() const = 0;
-  virtual double GetD() const = 0;
-
-  virtual void SetSetpoint(double setpoint) = 0;
-  virtual double GetSetpoint() const = 0;
-
-  virtual void Reset() = 0;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PIDOutput.h b/wpilibc/src/main/native/include/frc/PIDOutput.h
deleted file mode 100644
index 37fb2a1..0000000
--- a/wpilibc/src/main/native/include/frc/PIDOutput.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/Base.h"
-
-namespace frc {
-
-/**
- * PIDOutput interface is a generic output for the PID class.
- *
- * PWMs use this class. Users implement this interface to allow for a
- * PIDController to read directly from the inputs.
- */
-class PIDOutput {
- public:
-  virtual void PIDWrite(double output) = 0;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PIDSource.h b/wpilibc/src/main/native/include/frc/PIDSource.h
deleted file mode 100644
index 1a807b1..0000000
--- a/wpilibc/src/main/native/include/frc/PIDSource.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-namespace frc {
-
-enum class PIDSourceType { kDisplacement, kRate };
-
-/**
- * PIDSource interface is a generic sensor source for the PID class.
- *
- * All sensors that can be used with the PID class will implement the PIDSource
- * that returns a standard value that will be used in the PID code.
- */
-class PIDSource {
- public:
-  virtual ~PIDSource() = default;
-
-  /**
-   * Set which parameter you are using as a process control variable.
-   *
-   * @param pidSource An enum to select the parameter.
-   */
-  virtual void SetPIDSourceType(PIDSourceType pidSource);
-
-  virtual PIDSourceType GetPIDSourceType() const;
-
-  virtual double PIDGet() = 0;
-
- protected:
-  PIDSourceType m_pidSource = PIDSourceType::kDisplacement;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PS4Controller.h b/wpilibc/src/main/native/include/frc/PS4Controller.h
new file mode 100644
index 0000000..ee87501
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PS4Controller.h
@@ -0,0 +1,403 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/GenericHID.h"
+
+namespace frc {
+
+/**
+ * Handle input from PS4 controllers connected to the Driver Station.
+ *
+ * <p>This class handles PS4 input that comes from the Driver Station. Each time
+ * a value is requested the most recent value is returned. There is a single
+ * class instance for each controller and the mapping of ports to hardware
+ * buttons depends on the code in the Driver Station.
+ */
+class PS4Controller : public GenericHID {
+ public:
+  /**
+   * Construct an instance of an PS4 controller.
+   *
+   * The controller index is the USB port on the Driver Station.
+   *
+   * @param port The port on the Driver Station that the controller is plugged
+   *             into (0-5).
+   */
+  explicit PS4Controller(int port);
+
+  ~PS4Controller() override = default;
+
+  PS4Controller(PS4Controller&&) = default;
+  PS4Controller& operator=(PS4Controller&&) = default;
+
+  /**
+   * Get the X axis value of left side of the controller.
+   *
+   * @return the axis value.
+   */
+  double GetLeftX() const;
+
+  /**
+   * Get the X axis value of right side of the controller.
+   *
+   * @return the axis value.
+   */
+  double GetRightX() const;
+
+  /**
+   * Get the Y axis value of left side of the controller.
+   *
+   * @return the axis value.
+   */
+  double GetLeftY() const;
+
+  /**
+   * Get the Y axis value of right side of the controller.
+   *
+   * @return the axis value.
+   */
+  double GetRightY() const;
+
+  /**
+   * Get the L2 axis value of the controller. Note that this axis is bound to
+   * the range of [0, 1] as opposed to the usual [-1, 1].
+   *
+   * @return the axis value.
+   */
+  double GetL2Axis() const;
+
+  /**
+   * Get the R2 axis value of the controller. Note that this axis is bound to
+   * the range of [0, 1] as opposed to the usual [-1, 1].
+   *
+   * @return the axis value.
+   */
+  double GetR2Axis() const;
+
+  /**
+   * Read the value of the Square button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetSquareButton() const;
+
+  /**
+   * Whether the Square button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetSquareButtonPressed();
+
+  /**
+   * Whether the Square button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetSquareButtonReleased();
+
+  /**
+   * Read the value of the Cross button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetCrossButton() const;
+
+  /**
+   * Whether the Cross button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetCrossButtonPressed();
+
+  /**
+   * Whether the Cross button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetCrossButtonReleased();
+
+  /**
+   * Read the value of the Circle button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetCircleButton() const;
+
+  /**
+   * Whether the Circle button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetCircleButtonPressed();
+
+  /**
+   * Whether the Circle button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetCircleButtonReleased();
+
+  /**
+   * Read the value of the Triangle button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetTriangleButton() const;
+
+  /**
+   * Whether the Triangle button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetTriangleButtonPressed();
+
+  /**
+   * Whether the Triangle button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetTriangleButtonReleased();
+
+  /**
+   * Read the value of the L1 button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetL1Button() const;
+
+  /**
+   * Whether the L1 button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetL1ButtonPressed();
+
+  /**
+   * Whether the L1 button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetL1ButtonReleased();
+
+  /**
+   * Read the value of the R1 button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetR1Button() const;
+
+  /**
+   * Whether the R1 button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetR1ButtonPressed();
+
+  /**
+   * Whether the R1 button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetR1ButtonReleased();
+
+  /**
+   * Read the value of the L2 button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetL2Button() const;
+
+  /**
+   * Whether the L2 button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetL2ButtonPressed();
+
+  /**
+   * Whether the L2 button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetL2ButtonReleased();
+
+  /**
+   * Read the value of the R2 button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetR2Button() const;
+
+  /**
+   * Whether the R2 button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetR2ButtonPressed();
+
+  /**
+   * Whether the R2 button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetR2ButtonReleased();
+
+  /**
+   * Read the value of the Share button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetShareButton() const;
+
+  /**
+   * Whether the Share button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetShareButtonPressed();
+
+  /**
+   * Whether the Share button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetShareButtonReleased();
+
+  /**
+   * Read the value of the Options button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetOptionsButton() const;
+
+  /**
+   * Whether the Options button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetOptionsButtonPressed();
+
+  /**
+   * Whether the Options button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetOptionsButtonReleased();
+
+  /**
+   * Read the value of the L3 button (pressing the left analog stick) on the
+   * controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetL3Button() const;
+
+  /**
+   * Whether the L3 (left stick) button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetL3ButtonPressed();
+
+  /**
+   * Whether the L3 (left stick) button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetL3ButtonReleased();
+
+  /**
+   * Read the value of the R3 button (pressing the right analog stick) on the
+   * controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetR3Button() const;
+
+  /**
+   * Whether the R3 (right stick) button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetR3ButtonPressed();
+
+  /**
+   * Whether the R3 (right stick) button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetR3ButtonReleased();
+
+  /**
+   * Read the value of the PS button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetPSButton() const;
+
+  /**
+   * Whether the PS button was pressed since the last check.
+   *
+   * @return Whether the button was pressed since the last check.
+   */
+  bool GetPSButtonPressed();
+
+  /**
+   * Whether the PS button was released since the last check.
+   *
+   * @return Whether the button was released since the last check.
+   */
+  bool GetPSButtonReleased();
+
+  /**
+   * Read the value of the touchpad button on the controller.
+   *
+   * @return The state of the button.
+   */
+  bool GetTouchpad() const;
+
+  /**
+   * Whether the touchpad was pressed since the last check.
+   *
+   * @return Whether the touchpad was pressed since the last check.
+   */
+  bool GetTouchpadPressed();
+
+  /**
+   * Whether the touchpad was released since the last check.
+   *
+   * @return Whether the touchpad was released since the last check.
+   */
+  bool GetTouchpadReleased();
+
+  struct Button {
+    static constexpr int kSquare = 1;
+    static constexpr int kCross = 2;
+    static constexpr int kCircle = 3;
+    static constexpr int kTriangle = 4;
+    static constexpr int kL1 = 5;
+    static constexpr int kR1 = 6;
+    static constexpr int kL2 = 7;
+    static constexpr int kR2 = 8;
+    static constexpr int kShare = 9;
+    static constexpr int kOptions = 10;
+    static constexpr int kL3 = 11;
+    static constexpr int kR3 = 12;
+    static constexpr int kPS = 13;
+    static constexpr int kTouchpad = 14;
+  };
+
+  struct Axis {
+    static constexpr int kLeftX = 0;
+    static constexpr int kLeftY = 1;
+    static constexpr int kRightX = 2;
+    static constexpr int kRightY = 5;
+    static constexpr int kL2 = 3;
+    static constexpr int kR2 = 4;
+  };
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWM.h b/wpilibc/src/main/native/include/frc/PWM.h
index 406a93e..efff540 100644
--- a/wpilibc/src/main/native/include/frc/PWM.h
+++ b/wpilibc/src/main/native/include/frc/PWM.h
@@ -1,24 +1,18 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <stdint.h>
 
 #include <hal/Types.h>
-#include <wpi/raw_ostream.h>
-
-#include "frc/MotorSafety.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 class AddressableLED;
-class SendableBuilder;
+class DMA;
 
 /**
  * Class implements the PWM generation in the FPGA.
@@ -37,9 +31,10 @@
  *   - 1 = minimum pulse width (currently 0.5ms)
  *   - 0 = disabled (i.e. PWM output is held low)
  */
-class PWM : public MotorSafety, public Sendable, public SendableHelper<PWM> {
+class PWM : public wpi::Sendable, public wpi::SendableHelper<PWM> {
  public:
   friend class AddressableLED;
+  friend class DMA;
   /**
    * Represents the amount to multiply the minimum servo-pulse pwm period by.
    */
@@ -67,8 +62,10 @@
    *
    * @param channel The PWM channel number. 0-9 are on-board, 10-19 are on the
    *                MXP port
+   * @param registerSendable If true, adds this instance to SendableRegistry
+   *                         and LiveWindow
    */
-  explicit PWM(int channel);
+  explicit PWM(int channel, bool registerSendable = true);
 
   /**
    * Free the PWM channel.
@@ -80,10 +77,6 @@
   PWM(PWM&&) = default;
   PWM& operator=(PWM&&) = default;
 
-  // MotorSafety interface
-  void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
-
   /**
    * Set the PWM value directly to the hardware.
    *
@@ -129,7 +122,7 @@
   /**
    * Set the PWM value based on a speed.
    *
-   * This is intended to be used by speed controllers.
+   * This is intended to be used by motor controllers.
    *
    * @pre SetMaxPositivePwm() called.
    * @pre SetMinPositivePwm() called.
@@ -137,14 +130,14 @@
    * @pre SetMaxNegativePwm() called.
    * @pre SetMinNegativePwm() called.
    *
-   * @param speed The speed to set the speed controller between -1.0 and 1.0.
+   * @param speed The speed to set the motor controller between -1.0 and 1.0.
    */
   virtual void SetSpeed(double speed);
 
   /**
    * Get the PWM value in terms of speed.
    *
-   * This is intended to be used by speed controllers.
+   * This is intended to be used by motor controllers.
    *
    * @pre SetMaxPositivePwm() called.
    * @pre SetMinPositivePwm() called.
@@ -171,12 +164,12 @@
   void SetZeroLatch();
 
   /**
-   * Optionally eliminate the deadband from a speed controller.
+   * Optionally eliminate the deadband from a motor controller.
    *
-   * @param eliminateDeadband If true, set the motor curve on the Jaguar to
-   *                          eliminate the deadband in the middle of the range.
-   *                          Otherwise, keep the full range without modifying
-   *                          any values.
+   * @param eliminateDeadband If true, set the motor curve on the speed
+   *                          controller to eliminate the deadband in the middle
+   *                          of the range. Otherwise, keep the full range
+   *                          without modifying any values.
    */
   void EnableDeadbandElimination(bool eliminateDeadband);
 
@@ -231,7 +224,7 @@
   int GetChannel() const;
 
  protected:
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/PWMSpeedController.h b/wpilibc/src/main/native/include/frc/PWMSpeedController.h
deleted file mode 100644
index b827d30..0000000
--- a/wpilibc/src/main/native/include/frc/PWMSpeedController.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWM.h"
-#include "frc/SpeedController.h"
-
-namespace frc {
-
-/**
- * Common base class for all PWM Speed Controllers.
- */
-class PWMSpeedController : public PWM, public SpeedController {
- public:
-  PWMSpeedController(PWMSpeedController&&) = default;
-  PWMSpeedController& operator=(PWMSpeedController&&) = default;
-
-  /**
-   * Set the PWM value.
-   *
-   * The PWM value is set using a range of -1.0 to 1.0, appropriately scaling
-   * the value for the FPGA.
-   *
-   * @param speed The speed value between -1.0 and 1.0 to set.
-   */
-  void Set(double value) override;
-
-  /**
-   * Get the recently set value of the PWM.
-   *
-   * @return The most recently set value for the PWM between -1.0 and 1.0.
-   */
-  double Get() const override;
-
-  void SetInverted(bool isInverted) override;
-
-  bool GetInverted() const override;
-
-  void Disable() override;
-
-  void StopMotor() override;
-
-  /**
-   * Write out the PID value as seen in the PIDOutput base object.
-   *
-   * @param output Write out the PWM value as was found in the PIDController
-   */
-  void PIDWrite(double output) override;
-
- protected:
-  /**
-   * Constructor for a PWM Speed Controller connected via PWM.
-   *
-   * @param channel The PWM channel that the controller is attached to. 0-9 are
-   *                on-board, 10-19 are on the MXP port
-   */
-  explicit PWMSpeedController(int channel);
-
-  void InitSendable(SendableBuilder& builder) override;
-
- private:
-  bool m_isInverted = false;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWMTalonFX.h b/wpilibc/src/main/native/include/frc/PWMTalonFX.h
deleted file mode 100644
index d85c7ca..0000000
--- a/wpilibc/src/main/native/include/frc/PWMTalonFX.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Cross the Road Electronics (CTRE) Talon FX Speed Controller with PWM
- * control.
- *
- * Note that the Talon FX uses the following bounds for PWM values. These
- * values should work reasonably well for most controllers, but if users
- * experience issues such as asymmetric behavior around the deadband or
- * inability to saturate the controller in either direction, calibration is
- * recommended. The calibration procedure can be found in the Talon FX User
- * Manual available from Cross The Road Electronics.
- *
- * \li 2.004ms = full "forward"
- * \li 1.520ms = the "high end" of the deadband range
- * \li 1.500ms = center of the deadband range (off)
- * \li 1.480ms = the "low end" of the deadband range
- * \li 0.997ms = full "reverse"
- */
-class PWMTalonFX : public PWMSpeedController {
- public:
-  /**
-   * Construct a Talon FX connected via PWM.
-   *
-   * @param channel The PWM channel that the Talon FX is attached to. 0-9 are
-   *                on-board, 10-19 are on the MXP port
-   */
-  explicit PWMTalonFX(int channel);
-
-  PWMTalonFX(PWMTalonFX&&) = default;
-  PWMTalonFX& operator=(PWMTalonFX&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWMTalonSRX.h b/wpilibc/src/main/native/include/frc/PWMTalonSRX.h
deleted file mode 100644
index b9c8369..0000000
--- a/wpilibc/src/main/native/include/frc/PWMTalonSRX.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Cross the Road Electronics (CTRE) Talon SRX Speed Controller with PWM
- * control.
- *
- * Note that the Talon SRX uses the following bounds for PWM values. These
- * values should work reasonably well for most controllers, but if users
- * experience issues such as asymmetric behavior around the deadband or
- * inability to saturate the controller in either direction, calibration is
- * recommended. The calibration procedure can be found in the Talon SRX User
- * Manual available from Cross The Road Electronics.
- *
- * \li 2.004ms = full "forward"
- * \li 1.520ms = the "high end" of the deadband range
- * \li 1.500ms = center of the deadband range (off)
- * \li 1.480ms = the "low end" of the deadband range
- * \li 0.997ms = full "reverse"
- */
-class PWMTalonSRX : public PWMSpeedController {
- public:
-  /**
-   * Construct a Talon SRX connected via PWM.
-   *
-   * @param channel The PWM channel that the Talon SRX is attached to. 0-9 are
-   *                on-board, 10-19 are on the MXP port
-   */
-  explicit PWMTalonSRX(int channel);
-
-  PWMTalonSRX(PWMTalonSRX&&) = default;
-  PWMTalonSRX& operator=(PWMTalonSRX&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWMVictorSPX.h b/wpilibc/src/main/native/include/frc/PWMVictorSPX.h
deleted file mode 100644
index a19e704..0000000
--- a/wpilibc/src/main/native/include/frc/PWMVictorSPX.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Cross the Road Electronics (CTRE) Victor SPX Speed Controller with PWM
- * control.
- *
- * Note that the Victor SPX uses the following bounds for PWM values. These
- * values should work reasonably well for most controllers, but if users
- * experience issues such as asymmetric behavior around the deadband or
- * inability to saturate the controller in either direction, calibration is
- * recommended. The calibration procedure can be found in the Victor SPX User
- * Manual available from Cross The Road Electronics.
- *
- * \li 2.004ms = full "forward"
- * \li 1.520ms = the "high end" of the deadband range
- * \li 1.500ms = center of the deadband range (off)
- * \li 1.480ms = the "low end" of the deadband range
- * \li 0.997ms = full "reverse"
- */
-class PWMVictorSPX : public PWMSpeedController {
- public:
-  /**
-   * Construct a Victor SPX connected via PWM.
-   *
-   * @param channel The PWM channel that the Victor SPX is attached to. 0-9
-   *                are on-board, 10-19 are on the MXP port
-   */
-  explicit PWMVictorSPX(int channel);
-
-  PWMVictorSPX(PWMVictorSPX&&) = default;
-  PWMVictorSPX& operator=(PWMVictorSPX&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PneumaticHub.h b/wpilibc/src/main/native/include/frc/PneumaticHub.h
new file mode 100644
index 0000000..857ed51
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PneumaticHub.h
@@ -0,0 +1,77 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include <hal/Types.h>
+#include <wpi/DenseMap.h>
+#include <wpi/mutex.h>
+
+#include "PneumaticsBase.h"
+
+namespace frc {
+class PneumaticHub : public PneumaticsBase {
+ public:
+  PneumaticHub();
+  explicit PneumaticHub(int module);
+
+  ~PneumaticHub() override = default;
+
+  bool GetCompressor() const override;
+
+  void SetClosedLoopControl(bool enabled) override;
+
+  bool GetClosedLoopControl() const override;
+
+  bool GetPressureSwitch() const override;
+
+  double GetCompressorCurrent() const override;
+
+  void SetSolenoids(int mask, int values) override;
+
+  int GetSolenoids() const override;
+
+  int GetModuleNumber() const override;
+
+  int GetSolenoidDisabledList() const override;
+
+  void FireOneShot(int index) override;
+
+  void SetOneShotDuration(int index, units::second_t duration) override;
+
+  bool CheckSolenoidChannel(int channel) const override;
+
+  int CheckAndReserveSolenoids(int mask) override;
+
+  void UnreserveSolenoids(int mask) override;
+
+  bool ReserveCompressor() override;
+
+  void UnreserveCompressor() override;
+
+  Solenoid MakeSolenoid(int channel) override;
+  DoubleSolenoid MakeDoubleSolenoid(int forwardChannel,
+                                    int reverseChannel) override;
+  Compressor MakeCompressor() override;
+
+ private:
+  class DataStore;
+  friend class DataStore;
+  friend class PneumaticsBase;
+  PneumaticHub(HAL_REVPHHandle handle, int module);
+
+  static std::shared_ptr<PneumaticsBase> GetForModule(int module);
+
+  std::shared_ptr<DataStore> m_dataStore;
+  HAL_REVPHHandle m_handle;
+  int m_module;
+
+  static wpi::mutex m_handleLock;
+  static std::unique_ptr<wpi::DenseMap<int, std::weak_ptr<DataStore>>>
+      m_handleMap;
+  static std::weak_ptr<DataStore>& GetDataStore(int module);
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PneumaticsBase.h b/wpilibc/src/main/native/include/frc/PneumaticsBase.h
new file mode 100644
index 0000000..06cad5d
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PneumaticsBase.h
@@ -0,0 +1,62 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include <units/time.h>
+
+#include "frc/PneumaticsModuleType.h"
+
+namespace frc {
+class Solenoid;
+class DoubleSolenoid;
+class Compressor;
+class PneumaticsBase {
+ public:
+  virtual ~PneumaticsBase() = default;
+
+  virtual bool GetCompressor() const = 0;
+
+  virtual bool GetPressureSwitch() const = 0;
+
+  virtual double GetCompressorCurrent() const = 0;
+
+  virtual void SetClosedLoopControl(bool on) = 0;
+
+  virtual bool GetClosedLoopControl() const = 0;
+
+  virtual void SetSolenoids(int mask, int values) = 0;
+
+  virtual int GetSolenoids() const = 0;
+
+  virtual int GetModuleNumber() const = 0;
+
+  virtual int GetSolenoidDisabledList() const = 0;
+
+  virtual void FireOneShot(int index) = 0;
+
+  virtual void SetOneShotDuration(int index, units::second_t duration) = 0;
+
+  virtual bool CheckSolenoidChannel(int channel) const = 0;
+
+  virtual int CheckAndReserveSolenoids(int mask) = 0;
+
+  virtual void UnreserveSolenoids(int mask) = 0;
+
+  virtual bool ReserveCompressor() = 0;
+
+  virtual void UnreserveCompressor() = 0;
+
+  virtual Solenoid MakeSolenoid(int channel) = 0;
+  virtual DoubleSolenoid MakeDoubleSolenoid(int forwardChannel,
+                                            int reverseChannel) = 0;
+  virtual Compressor MakeCompressor() = 0;
+
+  static std::shared_ptr<PneumaticsBase> GetForType(
+      int module, PneumaticsModuleType moduleType);
+  static int GetDefaultForType(PneumaticsModuleType moduleType);
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PneumaticsControlModule.h b/wpilibc/src/main/native/include/frc/PneumaticsControlModule.h
new file mode 100644
index 0000000..64686d6
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PneumaticsControlModule.h
@@ -0,0 +1,89 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include <hal/Types.h>
+#include <wpi/DenseMap.h>
+#include <wpi/mutex.h>
+
+#include "PneumaticsBase.h"
+
+namespace frc {
+class PneumaticsControlModule : public PneumaticsBase {
+ public:
+  PneumaticsControlModule();
+  explicit PneumaticsControlModule(int module);
+
+  ~PneumaticsControlModule() override = default;
+
+  bool GetCompressor() const override;
+
+  void SetClosedLoopControl(bool enabled) override;
+
+  bool GetClosedLoopControl() const override;
+
+  bool GetPressureSwitch() const override;
+
+  double GetCompressorCurrent() const override;
+
+  bool GetCompressorCurrentTooHighFault() const;
+  bool GetCompressorCurrentTooHighStickyFault() const;
+  bool GetCompressorShortedFault() const;
+  bool GetCompressorShortedStickyFault() const;
+  bool GetCompressorNotConnectedFault() const;
+  bool GetCompressorNotConnectedStickyFault() const;
+
+  bool GetSolenoidVoltageFault() const;
+  bool GetSolenoidVoltageStickyFault() const;
+
+  void ClearAllStickyFaults();
+
+  void SetSolenoids(int mask, int values) override;
+
+  int GetSolenoids() const override;
+
+  int GetModuleNumber() const override;
+
+  int GetSolenoidDisabledList() const override;
+
+  void FireOneShot(int index) override;
+
+  void SetOneShotDuration(int index, units::second_t duration) override;
+
+  bool CheckSolenoidChannel(int channel) const override;
+
+  int CheckAndReserveSolenoids(int mask) override;
+
+  void UnreserveSolenoids(int mask) override;
+
+  bool ReserveCompressor() override;
+
+  void UnreserveCompressor() override;
+
+  Solenoid MakeSolenoid(int channel) override;
+  DoubleSolenoid MakeDoubleSolenoid(int forwardChannel,
+                                    int reverseChannel) override;
+  Compressor MakeCompressor() override;
+
+ private:
+  class DataStore;
+  friend class DataStore;
+  friend class PneumaticsBase;
+  PneumaticsControlModule(HAL_CTREPCMHandle handle, int module);
+
+  static std::shared_ptr<PneumaticsBase> GetForModule(int module);
+
+  std::shared_ptr<DataStore> m_dataStore;
+  HAL_CTREPCMHandle m_handle;
+  int m_module;
+
+  static wpi::mutex m_handleLock;
+  static std::unique_ptr<wpi::DenseMap<int, std::weak_ptr<DataStore>>>
+      m_handleMap;
+  static std::weak_ptr<DataStore>& GetDataStore(int module);
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PneumaticsModuleType.h b/wpilibc/src/main/native/include/frc/PneumaticsModuleType.h
new file mode 100644
index 0000000..7f70662
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PneumaticsModuleType.h
@@ -0,0 +1,9 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+namespace frc {
+enum class PneumaticsModuleType { CTREPCM, REVPH };
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PowerDistribution.h b/wpilibc/src/main/native/include/frc/PowerDistribution.h
new file mode 100644
index 0000000..2863daf
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/PowerDistribution.h
@@ -0,0 +1,112 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <hal/Types.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+namespace frc {
+
+/**
+ * Class for getting voltage, current, temperature, power and energy from the
+ * CAN PDP.
+ */
+class PowerDistribution : public wpi::Sendable,
+                          public wpi::SendableHelper<PowerDistribution> {
+ public:
+  static constexpr int kDefaultModule = -1;
+  enum class ModuleType { kAutomatic = 0, kCTRE = 1, kRev = 2 };
+
+  /**
+   * Constructs a PowerDistribution.
+   *
+   * Uses the default CAN ID.
+   */
+  PowerDistribution();
+
+  /**
+   * Constructs a PowerDistribution.
+   *
+   * @param module The CAN ID of the PDP
+   * @param moduleType The type of module
+   */
+  PowerDistribution(int module, ModuleType moduleType);
+
+  ~PowerDistribution() override;
+  PowerDistribution(PowerDistribution&&) = default;
+  PowerDistribution& operator=(PowerDistribution&&) = default;
+
+  /**
+   * Query the input voltage of the PDP.
+   *
+   * @return The voltage of the PDP in volts
+   */
+  double GetVoltage() const;
+
+  /**
+   * Query the temperature of the PDP.
+   *
+   * @return The temperature of the PDP in degrees Celsius
+   */
+  double GetTemperature() const;
+
+  /**
+   * Query the current of a single channel of the PDP.
+   *
+   * @return The current of one of the PDP channels (channels 0-15) in Amperes
+   */
+  double GetCurrent(int channel) const;
+
+  /**
+   * Query the total current of all monitored PDP channels (0-15).
+   *
+   * @return The the total current drawn from the PDP channels in Amperes
+   */
+  double GetTotalCurrent() const;
+
+  /**
+   * Query the total power drawn from the monitored PDP channels.
+   *
+   * @return The the total power drawn from the PDP channels in Watts
+   */
+  double GetTotalPower() const;
+
+  /**
+   * Query the total energy drawn from the monitored PDP channels.
+   *
+   * @return The the total energy drawn from the PDP channels in Joules
+   */
+  double GetTotalEnergy() const;
+
+  /**
+   * Reset the total energy drawn from the PDP.
+   *
+   * @see PowerDistribution#GetTotalEnergy
+   */
+  void ResetTotalEnergy();
+
+  /**
+   * Remove all of the fault flags on the PDP.
+   */
+  void ClearStickyFaults();
+
+  /**
+   * Gets module number (CAN ID).
+   */
+  int GetModule() const;
+
+  bool GetSwitchableChannel() const;
+
+  void SetSwitchableChannel(bool enabled);
+
+  void InitSendable(wpi::SendableBuilder& builder) override;
+
+ private:
+  hal::Handle<HAL_PowerDistributionHandle> m_handle;
+  int m_module;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PowerDistributionPanel.h b/wpilibc/src/main/native/include/frc/PowerDistributionPanel.h
deleted file mode 100644
index 9ec00a3..0000000
--- a/wpilibc/src/main/native/include/frc/PowerDistributionPanel.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <hal/Types.h>
-
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
-
-namespace frc {
-
-class SendableBuilder;
-
-/**
- * Class for getting voltage, current, temperature, power and energy from the
- * CAN PDP.
- */
-class PowerDistributionPanel : public ErrorBase,
-                               public Sendable,
-                               public SendableHelper<PowerDistributionPanel> {
- public:
-  PowerDistributionPanel();
-  explicit PowerDistributionPanel(int module);
-
-  PowerDistributionPanel(PowerDistributionPanel&&) = default;
-  PowerDistributionPanel& operator=(PowerDistributionPanel&&) = default;
-
-  /**
-   * Query the input voltage of the PDP.
-   *
-   * @return The voltage of the PDP in volts
-   */
-  double GetVoltage() const;
-
-  /**
-   * Query the temperature of the PDP.
-   *
-   * @return The temperature of the PDP in degrees Celsius
-   */
-  double GetTemperature() const;
-
-  /**
-   * Query the current of a single channel of the PDP.
-   *
-   * @return The current of one of the PDP channels (channels 0-15) in Amperes
-   */
-  double GetCurrent(int channel) const;
-
-  /**
-   * Query the total current of all monitored PDP channels (0-15).
-   *
-   * @return The the total current drawn from the PDP channels in Amperes
-   */
-  double GetTotalCurrent() const;
-
-  /**
-   * Query the total power drawn from the monitored PDP channels.
-   *
-   * @return The the total power drawn from the PDP channels in Watts
-   */
-  double GetTotalPower() const;
-
-  /**
-   * Query the total energy drawn from the monitored PDP channels.
-   *
-   * @return The the total energy drawn from the PDP channels in Joules
-   */
-  double GetTotalEnergy() const;
-
-  /**
-   * Reset the total energy drawn from the PDP.
-   *
-   * @see PowerDistributionPanel#GetTotalEnergy
-   */
-  void ResetTotalEnergy();
-
-  /**
-   * Remove all of the fault flags on the PDP.
-   */
-  void ClearStickyFaults();
-
-  /**
-   * Gets module number (CAN ID).
-   */
-  int GetModule() const;
-
-  void InitSendable(SendableBuilder& builder) override;
-
- private:
-  hal::Handle<HAL_PDPHandle> m_handle;
-  int m_module;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Preferences.h b/wpilibc/src/main/native/include/frc/Preferences.h
index f04b012..b939d9e 100644
--- a/wpilibc/src/main/native/include/frc/Preferences.h
+++ b/wpilibc/src/main/native/include/frc/Preferences.h
@@ -1,21 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <stdint.h>
 
-#include <memory>
 #include <string>
+#include <string_view>
 #include <vector>
 
-#include <networktables/NetworkTable.h>
-
-#include "frc/ErrorBase.h"
+#include <wpi/deprecated.h>
 
 namespace frc {
 
@@ -30,16 +25,18 @@
  *
  * This class is thread safe.
  *
- * This will also interact with {@link NetworkTable} by creating a table called
+ * This will also interact with NetworkTable by creating a table called
  * "Preferences" with all the key-value pairs.
  */
-class Preferences : public ErrorBase {
+class Preferences {
  public:
   /**
    * Get the one and only {@link Preferences} object.
    *
    * @return pointer to the {@link Preferences}
+   * @deprecated Use the static methods
    */
+  WPI_DEPRECATED("Use static methods")
   static Preferences* GetInstance();
 
   /**
@@ -47,7 +44,7 @@
    *
    * @return a vector of the keys
    */
-  std::vector<std::string> GetKeys();
+  static std::vector<std::string> GetKeys();
 
   /**
    * Returns the string at the given key.  If this table does not have a value
@@ -57,7 +54,8 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  std::string GetString(wpi::StringRef key, wpi::StringRef defaultValue = "");
+  static std::string GetString(std::string_view key,
+                               std::string_view defaultValue = "");
 
   /**
    * Returns the int at the given key.  If this table does not have a value for
@@ -67,7 +65,7 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  int GetInt(wpi::StringRef key, int defaultValue = 0);
+  static int GetInt(std::string_view key, int defaultValue = 0);
 
   /**
    * Returns the double at the given key.  If this table does not have a value
@@ -77,7 +75,7 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  double GetDouble(wpi::StringRef key, double defaultValue = 0.0);
+  static double GetDouble(std::string_view key, double defaultValue = 0.0);
 
   /**
    * Returns the float at the given key.  If this table does not have a value
@@ -87,7 +85,7 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  float GetFloat(wpi::StringRef key, float defaultValue = 0.0);
+  static float GetFloat(std::string_view key, float defaultValue = 0.0);
 
   /**
    * Returns the boolean at the given key.  If this table does not have a value
@@ -97,7 +95,7 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  bool GetBoolean(wpi::StringRef key, bool defaultValue = false);
+  static bool GetBoolean(std::string_view key, bool defaultValue = false);
 
   /**
    * Returns the long (int64_t) at the given key.  If this table does not have a
@@ -108,7 +106,7 @@
    * @param defaultValue the value to return if none exists in the table
    * @return either the value in the table, or the defaultValue
    */
-  int64_t GetLong(wpi::StringRef key, int64_t defaultValue = 0);
+  static int64_t GetLong(std::string_view key, int64_t defaultValue = 0);
 
   /**
    * Puts the given string into the preferences table.
@@ -119,13 +117,25 @@
    * @param key   the key
    * @param value the value
    */
-  void PutString(wpi::StringRef key, wpi::StringRef value);
+  static void SetString(std::string_view key, std::string_view value);
+
+  /**
+   * Puts the given string into the preferences table.
+   *
+   * The value may not have quotation marks, nor may the key have any whitespace
+   * nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetString instead.")
+  static void PutString(std::string_view key, std::string_view value);
 
   /**
    * Puts the given string into the preferences table if it doesn't
    * already exist.
    */
-  void InitString(wpi::StringRef key, wpi::StringRef value);
+  static void InitString(std::string_view key, std::string_view value);
 
   /**
    * Puts the given int into the preferences table.
@@ -135,13 +145,24 @@
    * @param key   the key
    * @param value the value
    */
-  void PutInt(wpi::StringRef key, int value);
+  static void SetInt(std::string_view key, int value);
+
+  /**
+   * Puts the given int into the preferences table.
+   *
+   * The key may not have any whitespace nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetInt instead.")
+  static void PutInt(std::string_view key, int value);
 
   /**
    * Puts the given int into the preferences table if it doesn't
    * already exist.
    */
-  void InitInt(wpi::StringRef key, int value);
+  static void InitInt(std::string_view key, int value);
 
   /**
    * Puts the given double into the preferences table.
@@ -151,13 +172,24 @@
    * @param key   the key
    * @param value the value
    */
-  void PutDouble(wpi::StringRef key, double value);
+  static void SetDouble(std::string_view key, double value);
+
+  /**
+   * Puts the given double into the preferences table.
+   *
+   * The key may not have any whitespace nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetDouble instead.")
+  static void PutDouble(std::string_view key, double value);
 
   /**
    * Puts the given double into the preferences table if it doesn't
    * already exist.
    */
-  void InitDouble(wpi::StringRef key, double value);
+  static void InitDouble(std::string_view key, double value);
 
   /**
    * Puts the given float into the preferences table.
@@ -167,13 +199,24 @@
    * @param key   the key
    * @param value the value
    */
-  void PutFloat(wpi::StringRef key, float value);
+  static void SetFloat(std::string_view key, float value);
+
+  /**
+   * Puts the given float into the preferences table.
+   *
+   * The key may not have any whitespace nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetFloat instead.")
+  static void PutFloat(std::string_view key, float value);
 
   /**
    * Puts the given float into the preferences table if it doesn't
    * already exist.
    */
-  void InitFloat(wpi::StringRef key, float value);
+  static void InitFloat(std::string_view key, float value);
 
   /**
    * Puts the given boolean into the preferences table.
@@ -183,13 +226,24 @@
    * @param key   the key
    * @param value the value
    */
-  void PutBoolean(wpi::StringRef key, bool value);
+  static void SetBoolean(std::string_view key, bool value);
+
+  /**
+   * Puts the given boolean into the preferences table.
+   *
+   * The key may not have any whitespace nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetBoolean instead.")
+  static void PutBoolean(std::string_view key, bool value);
 
   /**
    * Puts the given boolean into the preferences table if it doesn't
    * already exist.
    */
-  void InitBoolean(wpi::StringRef key, bool value);
+  static void InitBoolean(std::string_view key, bool value);
 
   /**
    * Puts the given long (int64_t) into the preferences table.
@@ -199,13 +253,24 @@
    * @param key   the key
    * @param value the value
    */
-  void PutLong(wpi::StringRef key, int64_t value);
+  static void SetLong(std::string_view key, int64_t value);
+
+  /**
+   * Puts the given long (int64_t) into the preferences table.
+   *
+   * The key may not have any whitespace nor an equals sign.
+   *
+   * @param key   the key
+   * @param value the value
+   */
+  WPI_DEPRECATED("Use SetLong instead.")
+  static void PutLong(std::string_view key, int64_t value);
 
   /**
    * Puts the given long into the preferences table if it doesn't
    * already exist.
    */
-  void InitLong(wpi::StringRef key, int64_t value);
+  static void InitLong(std::string_view key, int64_t value);
 
   /**
    * Returns whether or not there is a key with the given name.
@@ -213,30 +278,22 @@
    * @param key the key
    * @return if there is a value at the given key
    */
-  bool ContainsKey(wpi::StringRef key);
+  static bool ContainsKey(std::string_view key);
 
   /**
    * Remove a preference.
    *
    * @param key the key
    */
-  void Remove(wpi::StringRef key);
+  static void Remove(std::string_view key);
 
   /**
    * Remove all preferences.
    */
-  void RemoveAll();
-
- protected:
-  Preferences();
-  virtual ~Preferences() = default;
-
-  Preferences(Preferences&&) = default;
-  Preferences& operator=(Preferences&&) = default;
+  static void RemoveAll();
 
  private:
-  std::shared_ptr<nt::NetworkTable> m_table;
-  NT_EntryListener m_listener;
+  Preferences() = default;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Relay.h b/wpilibc/src/main/native/include/frc/Relay.h
index c903fc0..4765c64 100644
--- a/wpilibc/src/main/native/include/frc/Relay.h
+++ b/wpilibc/src/main/native/include/frc/Relay.h
@@ -1,26 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string>
 
 #include <hal/Types.h>
-#include <wpi/raw_ostream.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
-#include "frc/ErrorBase.h"
 #include "frc/MotorSafety.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Class for Spike style relay outputs.
  *
@@ -34,8 +28,8 @@
  * a solenoid).
  */
 class Relay : public MotorSafety,
-              public Sendable,
-              public SendableHelper<Relay> {
+              public wpi::Sendable,
+              public wpi::SendableHelper<Relay> {
  public:
   enum Value { kOff, kOn, kForward, kReverse };
   enum Direction { kBothDirections, kForwardOnly, kReverseOnly };
@@ -95,9 +89,9 @@
   // MotorSafety interface
   void StopMotor() override;
 
-  void GetDescription(wpi::raw_ostream& desc) const override;
+  std::string GetDescription() const override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   int m_channel;
diff --git a/wpilibc/src/main/native/include/frc/Resource.h b/wpilibc/src/main/native/include/frc/Resource.h
index e9759d5..4109cc4 100644
--- a/wpilibc/src/main/native/include/frc/Resource.h
+++ b/wpilibc/src/main/native/include/frc/Resource.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -15,8 +12,6 @@
 
 #include <wpi/mutex.h>
 
-#include "frc/ErrorBase.h"
-
 namespace frc {
 
 /**
@@ -29,7 +24,7 @@
  * resources; it just tracks which indices were marked in use by Allocate and
  * not yet freed by Free.
  */
-class Resource : public ErrorBase {
+class Resource {
  public:
   virtual ~Resource() = default;
 
diff --git a/wpilibc/src/main/native/include/frc/RobotBase.h b/wpilibc/src/main/native/include/frc/RobotBase.h
index 66d5637..70c6093 100644
--- a/wpilibc/src/main/native/include/frc/RobotBase.h
+++ b/wpilibc/src/main/native/include/frc/RobotBase.h
@@ -1,39 +1,50 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <chrono>
 #include <thread>
 
+#include <hal/DriverStation.h>
 #include <hal/HALBase.h>
 #include <hal/Main.h>
 #include <wpi/condition_variable.h>
+#include <wpi/deprecated.h>
 #include <wpi/mutex.h>
-#include <wpi/raw_ostream.h>
 
-#include "frc/Base.h"
+#include "frc/Errors.h"
+#include "frc/RuntimeType.h"
 
 namespace frc {
 
-class DriverStation;
-
 int RunHALInitialization();
 
 namespace impl {
 
 template <class Robot>
 void RunRobot(wpi::mutex& m, Robot** robot) {
-  static Robot theRobot;
-  {
-    std::scoped_lock lock{m};
-    *robot = &theRobot;
+  try {
+    static Robot theRobot;
+    {
+      std::scoped_lock lock{m};
+      *robot = &theRobot;
+    }
+    theRobot.StartCompetition();
+  } catch (const frc::RuntimeError& e) {
+    e.Report();
+    FRC_ReportError(
+        err::Error, "{}",
+        "The robot program quit unexpectedly."
+        " This is usually due to a code error.\n"
+        "  The above stacktrace can help determine where the error occurred.\n"
+        "  See https://wpilib.org/stacktrace for more information.\n");
+    throw;
+  } catch (const std::exception& e) {
+    HAL_SendError(1, err::Error, 0, e.what(), "", "", 1);
+    throw;
   }
-  theRobot.StartCompetition();
 }
 
 }  // namespace impl
@@ -77,15 +88,18 @@
     HAL_RunMain();
 
     // signal loop to exit
-    if (robot) robot->EndCompetition();
+    if (robot) {
+      robot->EndCompetition();
+    }
 
     // prefer to join, but detach to exit if it doesn't exit in a timely manner
     using namespace std::chrono_literals;
     std::unique_lock lock{m};
-    if (cv.wait_for(lock, 1s, [] { return exited; }))
+    if (cv.wait_for(lock, 1s, [] { return exited; })) {
       thr.join();
-    else
+    } else {
       thr.detach();
+    }
   } else {
     impl::RunRobot<Robot>(m, &robot);
   }
@@ -95,13 +109,6 @@
   return 0;
 }
 
-#define START_ROBOT_CLASS(_ClassName_)                                 \
-  WPI_DEPRECATED("Call frc::StartRobot<" #_ClassName_                  \
-                 ">() in your own main() instead of using the "        \
-                 "START_ROBOT_CLASS(" #_ClassName_ ") macro.")         \
-  int StartRobotClassImpl() { return frc::StartRobot<_ClassName_>(); } \
-  int main() { return StartRobotClassImpl(); }
-
 /**
  * Implement a Robot Program framework.
  *
@@ -149,16 +156,36 @@
    *
    * @return True if the robot is currently operating in Tele-Op mode as
    *         determined by the field controls.
+   * @deprecated Use IsTeleop() instead.
    */
+  WPI_DEPRECATED("Use IsTeleop() instead")
   bool IsOperatorControl() const;
 
   /**
+   * Determine if the robot is currently in Operator Control mode.
+   *
+   * @return True if the robot is currently operating in Tele-Op mode as
+   *         determined by the field controls.
+   */
+  bool IsTeleop() const;
+
+  /**
+   * Determine if the robot is current in Operator Control mode and enabled.
+   *
+   * @return True if the robot is currently operating in Tele-Op mode while
+   *         enabled as determined by the field-controls.
+   * @deprecated Use IsTeleopEnabled() instead.
+   */
+  WPI_DEPRECATED("Use IsTeleopEnabled() instead")
+  bool IsOperatorControlEnabled() const;
+
+  /**
    * Determine if the robot is current in Operator Control mode and enabled.
    *
    * @return True if the robot is currently operating in Tele-Op mode while
    * wnabled as determined by the field-controls.
    */
-  bool IsOperatorControlEnabled() const;
+  bool IsTeleopEnabled() const;
 
   /**
    * Determine if the robot is currently in Test mode.
@@ -186,6 +213,13 @@
   virtual void EndCompetition() = 0;
 
   /**
+   * Get the current runtime type.
+   *
+   * @return Current runtime type.
+   */
+  static RuntimeType GetRuntimeType();
+
+  /**
    * Get if the robot is real.
    *
    * @return If the robot is running in the real world.
@@ -218,15 +252,11 @@
    */
   RobotBase();
 
-  virtual ~RobotBase();
+  virtual ~RobotBase() = default;
 
  protected:
-  // m_ds isn't moved in these because DriverStation is a singleton; every
-  // instance of RobotBase has a reference to the same object.
-  RobotBase(RobotBase&&) noexcept;
-  RobotBase& operator=(RobotBase&&) noexcept;
-
-  DriverStation& m_ds;
+  RobotBase(RobotBase&&) = default;
+  RobotBase& operator=(RobotBase&&) = default;
 
   static std::thread::id m_threadId;
 };
diff --git a/wpilibc/src/main/native/include/frc/RobotController.h b/wpilibc/src/main/native/include/frc/RobotController.h
index fae136b..e9750f0 100644
--- a/wpilibc/src/main/native/include/frc/RobotController.h
+++ b/wpilibc/src/main/native/include/frc/RobotController.h
@@ -1,14 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <stdint.h>
 
+#include <units/voltage.h>
+
 namespace frc {
 
 struct CANStatus {
@@ -59,6 +58,13 @@
   static bool GetUserButton();
 
   /**
+   * Read the battery voltage.
+   *
+   * @return The battery voltage in Volts.
+   */
+  static units::volt_t GetBatteryVoltage();
+
+  /**
    * Check if the FPGA outputs are enabled.
    *
    * The outputs may be disabled if the robot is disabled or e-stopped, the
@@ -182,6 +188,28 @@
    */
   static int GetFaultCount6V();
 
+  /**
+   * Get the current brownout voltage setting.
+   *
+   * @return The brownout voltage
+   */
+  static units::volt_t GetBrownoutVoltage();
+
+  /**
+   * Set the voltage the roboRIO will brownout and disable all outputs.
+   *
+   * Note that this only does anything on the roboRIO 2.
+   * On the roboRIO it is a no-op.
+   *
+   * @param brownoutVoltage The brownout voltage
+   */
+  static void SetBrownoutVoltage(units::volt_t brownoutVoltage);
+
+  /**
+   * Get the current status of the CAN bus.
+   *
+   * @return The status of the CAN bus
+   */
   static CANStatus GetCANStatus();
 };
 
diff --git a/wpilibc/src/main/native/include/frc/RobotDrive.h b/wpilibc/src/main/native/include/frc/RobotDrive.h
deleted file mode 100644
index a8b63e6..0000000
--- a/wpilibc/src/main/native/include/frc/RobotDrive.h
+++ /dev/null
@@ -1,456 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-
-#include <wpi/deprecated.h>
-#include <wpi/raw_ostream.h>
-
-#include "frc/ErrorBase.h"
-#include "frc/MotorSafety.h"
-
-namespace frc {
-
-class SpeedController;
-class GenericHID;
-
-/**
- * Utility class for handling Robot drive based on a definition of the motor
- * configuration.
- *
- * The robot drive class handles basic driving for a robot. Currently, 2 and 4
- * motor tank and mecanum drive trains are supported. In the future other drive
- * types like swerve might be implemented. Motor channel numbers are passed
- * supplied on creation of the class. Those are used for either the Drive
- * function (intended for hand created drive code, such as autonomous) or with
- * the Tank/Arcade functions intended to be used for Operator Control driving.
- *
- * @deprecated Use DifferentialDrive or MecanumDrive classes instead.
- *
- */
-class RobotDrive : public MotorSafety {
- public:
-  enum MotorType {
-    kFrontLeftMotor = 0,
-    kFrontRightMotor = 1,
-    kRearLeftMotor = 2,
-    kRearRightMotor = 3
-  };
-
-  /**
-   * Constructor for RobotDrive with 2 motors specified with channel numbers.
-   *
-   * Set up parameters for a two wheel drive system where the
-   * left and right motor pwm channels are specified in the call.
-   * This call assumes Talons for controlling the motors.
-   *
-   * @param leftMotorChannel  The PWM channel number that drives the left motor.
-   *                          0-9 are on-board, 10-19 are on the MXP port
-   * @param rightMotorChannel The PWM channel number that drives the right
-   *                          motor. 0-9 are on-board, 10-19 are on the MXP port
-   */
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(int leftMotorChannel, int rightMotorChannel);
-
-  /**
-   * Constructor for RobotDrive with 4 motors specified with channel numbers.
-   *
-   * Set up parameters for a four wheel drive system where all four motor
-   * pwm channels are specified in the call.
-   * This call assumes Talons for controlling the motors.
-   *
-   * @param frontLeftMotor  Front left motor channel number. 0-9 are on-board,
-   *                        10-19 are on the MXP port
-   * @param rearLeftMotor   Rear Left motor channel number. 0-9 are on-board,
-   *                        10-19 are on the MXP port
-   * @param frontRightMotor Front right motor channel number. 0-9 are on-board,
-   *                        10-19 are on the MXP port
-   * @param rearRightMotor  Rear Right motor channel number. 0-9 are on-board,
-   *                        10-19 are on the MXP port
-   */
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(int frontLeftMotorChannel, int rearLeftMotorChannel,
-             int frontRightMotorChannel, int rearRightMotorChannel);
-
-  /**
-   * Constructor for RobotDrive with 2 motors specified as SpeedController
-   * objects.
-   *
-   * The SpeedController version of the constructor enables programs to use the
-   * RobotDrive classes with subclasses of the SpeedController objects, for
-   * example, versions with ramping or reshaping of the curve to suit motor bias
-   * or deadband elimination.
-   *
-   * @param leftMotor  The left SpeedController object used to drive the robot.
-   * @param rightMotor The right SpeedController object used to drive the robot.
-   */
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(SpeedController* leftMotor, SpeedController* rightMotor);
-
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(SpeedController& leftMotor, SpeedController& rightMotor);
-
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(std::shared_ptr<SpeedController> leftMotor,
-             std::shared_ptr<SpeedController> rightMotor);
-
-  /**
-   * Constructor for RobotDrive with 4 motors specified as SpeedController
-   * objects.
-   *
-   * Speed controller input version of RobotDrive (see previous comments).
-   *
-   * @param frontLeftMotor  The front left SpeedController object used to drive
-   *                        the robot.
-   * @param rearLeftMotor   The back left SpeedController object used to drive
-   *                        the robot.
-   * @param frontRightMotor The front right SpeedController object used to drive
-   *                        the robot.
-   * @param rearRightMotor  The back right SpeedController object used to drive
-   *                        the robot.
-   */
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(SpeedController* frontLeftMotor, SpeedController* rearLeftMotor,
-             SpeedController* frontRightMotor, SpeedController* rearRightMotor);
-
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(SpeedController& frontLeftMotor, SpeedController& rearLeftMotor,
-             SpeedController& frontRightMotor, SpeedController& rearRightMotor);
-
-  WPI_DEPRECATED("Use DifferentialDrive or MecanumDrive classes instead.")
-  RobotDrive(std::shared_ptr<SpeedController> frontLeftMotor,
-             std::shared_ptr<SpeedController> rearLeftMotor,
-             std::shared_ptr<SpeedController> frontRightMotor,
-             std::shared_ptr<SpeedController> rearRightMotor);
-
-  virtual ~RobotDrive() = default;
-
-  RobotDrive(RobotDrive&&) = default;
-  RobotDrive& operator=(RobotDrive&&) = default;
-
-  /**
-   * Drive the motors at "outputMagnitude" and "curve".
-   *
-   * Both outputMagnitude and curve are -1.0 to +1.0 values, where 0.0
-   * represents stopped and not turning. curve < 0 will turn left and curve > 0
-   * will turn right.
-   *
-   * The algorithm for steering provides a constant turn radius for any normal
-   * speed range, both forward and backward. Increasing m_sensitivity causes
-   * sharper turns for fixed values of curve.
-   *
-   * This function will most likely be used in an autonomous routine.
-   *
-   * @param outputMagnitude The speed setting for the outside wheel in a turn,
-   *                        forward or backwards, +1 to -1.
-   * @param curve           The rate of turn, constant for different forward
-   *                        speeds. Set curve < 0 for left turn or curve > 0 for
-   *                        right turn.
-   *
-   * Set curve = e^(-r/w) to get a turn radius r for wheelbase w of your robot.
-   * Conversely, turn radius r = -ln(curve)*w for a given value of curve and
-   * wheelbase w.
-   */
-  void Drive(double outputMagnitude, double curve);
-
-  /**
-   * Provide tank steering using the stored robot configuration.
-   *
-   * Drive the robot using two joystick inputs. The Y-axis will be selected from
-   * each Joystick object.
-   *
-   * @param leftStick  The joystick to control the left side of the robot.
-   * @param rightStick The joystick to control the right side of the robot.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void TankDrive(GenericHID* leftStick, GenericHID* rightStick,
-                 bool squaredInputs = true);
-
-  /**
-   * Provide tank steering using the stored robot configuration.
-   *
-   * Drive the robot using two joystick inputs. The Y-axis will be selected from
-   * each Joystick object.
-   *
-   * @param leftStick  The joystick to control the left side of the robot.
-   * @param rightStick The joystick to control the right side of the robot.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void TankDrive(GenericHID& leftStick, GenericHID& rightStick,
-                 bool squaredInputs = true);
-
-  /**
-   * Provide tank steering using the stored robot configuration.
-   *
-   * This function lets you pick the axis to be used on each Joystick object for
-   * the left and right sides of the robot.
-   *
-   * @param leftStick  The Joystick object to use for the left side of the
-   *                   robot.
-   * @param leftAxis   The axis to select on the left side Joystick object.
-   * @param rightStick The Joystick object to use for the right side of the
-   *                   robot.
-   * @param rightAxis  The axis to select on the right side Joystick object.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void TankDrive(GenericHID* leftStick, int leftAxis, GenericHID* rightStick,
-                 int rightAxis, bool squaredInputs = true);
-
-  void TankDrive(GenericHID& leftStick, int leftAxis, GenericHID& rightStick,
-                 int rightAxis, bool squaredInputs = true);
-
-  /**
-   * Provide tank steering using the stored robot configuration.
-   *
-   * This function lets you directly provide joystick values from any source.
-   *
-   * @param leftValue  The value of the left stick.
-   * @param rightValue The value of the right stick.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void TankDrive(double leftValue, double rightValue,
-                 bool squaredInputs = true);
-
-  /**
-   * Arcade drive implements single stick driving.
-   *
-   * Given a single Joystick, the class assumes the Y axis for the move value
-   * and the X axis for the rotate value. (Should add more information here
-   * regarding the way that arcade drive works.)
-   *
-   * @param stick         The joystick to use for Arcade single-stick driving.
-   *                      The Y-axis will be selected for forwards/backwards and
-   *                      the X-axis will be selected for rotation rate.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void ArcadeDrive(GenericHID* stick, bool squaredInputs = true);
-
-  /**
-   * Arcade drive implements single stick driving.
-   *
-   * Given a single Joystick, the class assumes the Y axis for the move value
-   * and the X axis for the rotate value. (Should add more information here
-   * regarding the way that arcade drive works.)
-   *
-   * @param stick         The joystick to use for Arcade single-stick driving.
-   *                      The Y-axis will be selected for forwards/backwards and
-   *                      the X-axis will be selected for rotation rate.
-   * @param squaredInputs If true, the sensitivity will be decreased for small
-   *                      values
-   */
-  void ArcadeDrive(GenericHID& stick, bool squaredInputs = true);
-
-  /**
-   * Arcade drive implements single stick driving.
-   *
-   * Given two joystick instances and two axis, compute the values to send to
-   * either two or four motors.
-   *
-   * @param moveStick     The Joystick object that represents the
-   *                      forward/backward direction
-   * @param moveAxis      The axis on the moveStick object to use for
-   *                      forwards/backwards (typically Y_AXIS)
-   * @param rotateStick   The Joystick object that represents the rotation value
-   * @param rotateAxis    The axis on the rotation object to use for the rotate
-   *                      right/left (typically X_AXIS)
-   * @param squaredInputs Setting this parameter to true increases the
-   *                      sensitivity at lower speeds
-   */
-  void ArcadeDrive(GenericHID* moveStick, int moveChannel,
-                   GenericHID* rotateStick, int rotateChannel,
-                   bool squaredInputs = true);
-
-  /**
-   * Arcade drive implements single stick driving.
-   *
-   * Given two joystick instances and two axis, compute the values to send to
-   * either two or four motors.
-   *
-   * @param moveStick     The Joystick object that represents the
-   *                      forward/backward direction
-   * @param moveAxis      The axis on the moveStick object to use for
-   *                      forwards/backwards (typically Y_AXIS)
-   * @param rotateStick   The Joystick object that represents the rotation value
-   * @param rotateAxis    The axis on the rotation object to use for the rotate
-   *                      right/left (typically X_AXIS)
-   * @param squaredInputs Setting this parameter to true increases the
-   *                      sensitivity at lower speeds
-   */
-  void ArcadeDrive(GenericHID& moveStick, int moveChannel,
-                   GenericHID& rotateStick, int rotateChannel,
-                   bool squaredInputs = true);
-
-  /**
-   * Arcade drive implements single stick driving.
-   *
-   * This function lets you directly provide joystick values from any source.
-   *
-   * @param moveValue     The value to use for fowards/backwards
-   * @param rotateValue   The value to use for the rotate right/left
-   * @param squaredInputs If set, increases the sensitivity at low speeds
-   */
-  void ArcadeDrive(double moveValue, double rotateValue,
-                   bool squaredInputs = true);
-
-  /**
-   * Drive method for Mecanum wheeled robots.
-   *
-   * A method for driving with Mecanum wheeled robots. There are 4 wheels
-   * on the robot, arranged so that the front and back wheels are toed in 45
-   * degrees.
-   * When looking at the wheels from the top, the roller axles should form an X
-   * across the robot.
-   *
-   * This is designed to be directly driven by joystick axes.
-   *
-   * @param x         The speed that the robot should drive in the X direction.
-   *                  [-1.0..1.0]
-   * @param y         The speed that the robot should drive in the Y direction.
-   *                  This input is inverted to match the forward == -1.0 that
-   *                  joysticks produce. [-1.0..1.0]
-   * @param rotation  The rate of rotation for the robot that is completely
-   *                  independent of the translation. [-1.0..1.0]
-   * @param gyroAngle The current angle reading from the gyro.  Use this to
-   *                  implement field-oriented controls.
-   */
-  void MecanumDrive_Cartesian(double x, double y, double rotation,
-                              double gyroAngle = 0.0);
-
-  /**
-   * Drive method for Mecanum wheeled robots.
-   *
-   * A method for driving with Mecanum wheeled robots. There are 4 wheels
-   * on the robot, arranged so that the front and back wheels are toed in 45
-   * degrees.
-   * When looking at the wheels from the top, the roller axles should form an X
-   * across the robot.
-   *
-   * @param magnitude The speed that the robot should drive in a given
-   *                  direction. [-1.0..1.0]
-   * @param direction The direction the robot should drive in degrees. The
-   *                  direction and maginitute are independent of the rotation
-   *                  rate.
-   * @param rotation  The rate of rotation for the robot that is completely
-   *                  independent of the magnitute or direction. [-1.0..1.0]
-   */
-  void MecanumDrive_Polar(double magnitude, double direction, double rotation);
-
-  /**
-   * Holonomic Drive method for Mecanum wheeled robots.
-   *
-   * This is an alias to MecanumDrive_Polar() for backward compatibility
-   *
-   * @param magnitude The speed that the robot should drive in a given
-   *                  direction. [-1.0..1.0]
-   * @param direction The direction the robot should drive. The direction and
-   *                  magnitude are independent of the rotation rate.
-   * @param rotation  The rate of rotation for the robot that is completely
-   *                  independent of the magnitude or direction.  [-1.0..1.0]
-   */
-  void HolonomicDrive(double magnitude, double direction, double rotation);
-
-  /**
-   * Set the speed of the right and left motors.
-   *
-   * This is used once an appropriate drive setup function is called such as
-   * TwoWheelDrive(). The motors are set to "leftOutput" and "rightOutput"
-   * and includes flipping the direction of one side for opposing motors.
-   *
-   * @param leftOutput  The speed to send to the left side of the robot.
-   * @param rightOutput The speed to send to the right side of the robot.
-   */
-  virtual void SetLeftRightMotorOutputs(double leftOutput, double rightOutput);
-
-  /*
-   * Invert a motor direction.
-   *
-   * This is used when a motor should run in the opposite direction as the drive
-   * code would normally run it. Motors that are direct drive would be inverted,
-   * the Drive code assumes that the motors are geared with one reversal.
-   *
-   * @param motor      The motor index to invert.
-   * @param isInverted True if the motor should be inverted when operated.
-   */
-  void SetInvertedMotor(MotorType motor, bool isInverted);
-
-  /**
-   * Set the turning sensitivity.
-   *
-   * This only impacts the Drive() entry-point.
-   *
-   * @param sensitivity Effectively sets the turning sensitivity (or turn radius
-   *                    for a given value)
-   */
-  void SetSensitivity(double sensitivity);
-
-  /**
-   * Configure the scaling factor for using RobotDrive with motor controllers in
-   * a mode other than PercentVbus.
-   *
-   * @param maxOutput Multiplied with the output percentage computed by the
-   *                  drive functions.
-   */
-  void SetMaxOutput(double maxOutput);
-
-  void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
-
- protected:
-  /**
-   * Common function to initialize all the robot drive constructors.
-   *
-   * Create a motor safety object (the real reason for the common code) and
-   * initialize all the motor assignments. The default timeout is set for the
-   * robot drive.
-   */
-  void InitRobotDrive();
-
-  /**
-   * Limit motor values to the -1.0 to +1.0 range.
-   */
-  double Limit(double number);
-
-  /**
-   * Normalize all wheel speeds if the magnitude of any wheel is greater than
-   * 1.0.
-   */
-  void Normalize(double* wheelSpeeds);
-
-  /**
-   * Rotate a vector in Cartesian space.
-   */
-  void RotateVector(double& x, double& y, double angle);
-
-  static constexpr int kMaxNumberOfMotors = 4;
-
-  double m_sensitivity = 0.5;
-  double m_maxOutput = 1.0;
-
-  std::shared_ptr<SpeedController> m_frontLeftMotor;
-  std::shared_ptr<SpeedController> m_frontRightMotor;
-  std::shared_ptr<SpeedController> m_rearLeftMotor;
-  std::shared_ptr<SpeedController> m_rearRightMotor;
-
- private:
-  int GetNumMotors() {
-    int motors = 0;
-    if (m_frontLeftMotor) motors++;
-    if (m_frontRightMotor) motors++;
-    if (m_rearLeftMotor) motors++;
-    if (m_rearRightMotor) motors++;
-    return motors;
-  }
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/RobotState.h b/wpilibc/src/main/native/include/frc/RobotState.h
index 5f1c136..cb97b13 100644
--- a/wpilibc/src/main/native/include/frc/RobotState.h
+++ b/wpilibc/src/main/native/include/frc/RobotState.h
@@ -1,12 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
+#include <wpi/deprecated.h>
+
 namespace frc {
 
 class RobotState {
@@ -16,7 +15,9 @@
   static bool IsDisabled();
   static bool IsEnabled();
   static bool IsEStopped();
+  WPI_DEPRECATED("Use IsTeleop() instead")
   static bool IsOperatorControl();
+  static bool IsTeleop();
   static bool IsAutonomous();
   static bool IsTest();
 };
diff --git a/wpilibc/src/main/native/include/frc/RuntimeType.h b/wpilibc/src/main/native/include/frc/RuntimeType.h
new file mode 100644
index 0000000..c3a8a0b
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/RuntimeType.h
@@ -0,0 +1,9 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+namespace frc {
+enum RuntimeType { kRoboRIO, kRoboRIO2, kSimulation };
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/SPI.h b/wpilibc/src/main/native/include/frc/SPI.h
index 3592775..36c82e4 100644
--- a/wpilibc/src/main/native/include/frc/SPI.h
+++ b/wpilibc/src/main/native/include/frc/SPI.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -13,10 +10,8 @@
 
 #include <hal/SPITypes.h>
 #include <units/time.h>
-#include <wpi/ArrayRef.h>
 #include <wpi/deprecated.h>
-
-#include "frc/ErrorBase.h"
+#include <wpi/span.h>
 
 namespace frc {
 
@@ -29,7 +24,7 @@
  * It probably should not be used directly.
  *
  */
-class SPI : public ErrorBase {
+class SPI {
  public:
   enum Port { kOnboardCS0 = 0, kOnboardCS1, kOnboardCS2, kOnboardCS3, kMXP };
 
@@ -40,11 +35,13 @@
    */
   explicit SPI(Port port);
 
-  ~SPI() override;
+  ~SPI();
 
   SPI(SPI&&) = default;
   SPI& operator=(SPI&&) = default;
 
+  Port GetPort() const;
+
   /**
    * Configure the rate of the generated clock signal.
    *
@@ -138,10 +135,12 @@
    * If the receive FIFO is empty, there is no active transfer, and initiate
    * is false, errors.
    *
-   * @param initiate If true, this function pushes "0" into the transmit buffer
-   *                 and initiates a transfer. If false, this function assumes
-   *                 that data is already in the receive FIFO from a previous
-   *                 write.
+   * @param initiate     If true, this function pushes "0" into the transmit
+   *                     buffer and initiates a transfer. If false, this
+   *                     function assumes that data is already in the receive
+   *                     FIFO from a previous write.
+   * @param dataReceived Buffer to receive data from the device
+   * @param size         The length of the transaction, in bytes
    */
   virtual int Read(bool initiate, uint8_t* dataReceived, int size);
 
@@ -178,7 +177,7 @@
    * @param dataToSend data to send (maximum 16 bytes)
    * @param zeroSize number of zeros to send after the data
    */
-  void SetAutoTransmitData(wpi::ArrayRef<uint8_t> dataToSend, int zeroSize);
+  void SetAutoTransmitData(wpi::span<const uint8_t> dataToSend, int zeroSize);
 
   /**
    * Start running the automatic SPI transfer engine at a periodic rate.
@@ -248,32 +247,6 @@
                            units::second_t timeout);
 
   /**
-   * Read data that has been transferred by the automatic SPI transfer engine.
-   *
-   * Transfers may be made a byte at a time, so it's necessary for the caller
-   * to handle cases where an entire transfer has not been completed.
-   *
-   * Each received data sequence consists of a timestamp followed by the
-   * received data bytes, one byte per word (in the least significant byte).
-   * The length of each received data sequence is the same as the combined
-   * size of the data and zeroSize set in SetAutoTransmitData().
-   *
-   * Blocks until numToRead words have been read or timeout expires.
-   * May be called with numToRead=0 to retrieve how many words are available.
-   *
-   * @deprecated Use unit safe version instead.
-   *             ReadAutoReceivedData(uint32_t* buffer, int numToRead, <!--
-   * -->         units::second_t timeout)
-   *
-   * @param buffer buffer where read words are stored
-   * @param numToRead number of words to read
-   * @param timeout timeout in seconds (ms resolution)
-   * @return Number of words remaining to be read
-   */
-  WPI_DEPRECATED("Use ReadAutoReceivedData with unit-safety instead")
-  int ReadAutoReceivedData(uint32_t* buffer, int numToRead, double timeout);
-
-  /**
    * Get the number of bytes dropped by the automatic SPI transfer engine due
    * to the receive buffer being full.
    *
@@ -297,17 +270,17 @@
   /**
    * Initialize the accumulator.
    *
-   * @param period    Time between reads
-   * @param cmd       SPI command to send to request data
-   * @param xferSize  SPI transfer size, in bytes
-   * @param validMask Mask to apply to received data for validity checking
-   * @param validData After valid_mask is applied, required matching value for
-   *                  validity checking
-   * @param dataShift Bit shift to apply to received data to get actual data
-   *                  value
-   * @param dataSize  Size (in bits) of data field
-   * @param isSigned  Is data field signed?
-   * @param bigEndian Is device big endian?
+   * @param period     Time between reads
+   * @param cmd        SPI command to send to request data
+   * @param xferSize   SPI transfer size, in bytes
+   * @param validMask  Mask to apply to received data for validity checking
+   * @param validValue After valid_mask is applied, required matching value for
+   *                   validity checking
+   * @param dataShift  Bit shift to apply to received data to get actual data
+   *                   value
+   * @param dataSize   Size (in bits) of data field
+   * @param isSigned   Is data field signed?
+   * @param bigEndian  Is device big endian?
    */
   void InitAccumulator(units::second_t period, int cmd, int xferSize,
                        int validMask, int validValue, int dataShift,
@@ -321,17 +294,17 @@
    * -->         xferSize, int validMask, int validValue, int dataShift, <!--
    * -->         int dataSize, bool isSigned, bool bigEndian)
    *
-   * @param period    Time between reads
-   * @param cmd       SPI command to send to request data
-   * @param xferSize  SPI transfer size, in bytes
-   * @param validMask Mask to apply to received data for validity checking
-   * @param validData After valid_mask is applied, required matching value for
-   *                  validity checking
-   * @param dataShift Bit shift to apply to received data to get actual data
-   *                  value
-   * @param dataSize  Size (in bits) of data field
-   * @param isSigned  Is data field signed?
-   * @param bigEndian Is device big endian?
+   * @param period     Time between reads
+   * @param cmd        SPI command to send to request data
+   * @param xferSize   SPI transfer size, in bytes
+   * @param validMask  Mask to apply to received data for validity checking
+   * @param validValue After valid_mask is applied, required matching value for
+   *                   validity checking
+   * @param dataShift  Bit shift to apply to received data to get actual data
+   *                   value
+   * @param dataSize   Size (in bits) of data field
+   * @param isSigned   Is data field signed?
+   * @param bigEndian  Is device big endian?
    */
   WPI_DEPRECATED("Use InitAccumulator with unit-safety instead")
   void InitAccumulator(double period, int cmd, int xferSize, int validMask,
diff --git a/wpilibc/src/main/native/include/frc/ScopedTracer.h b/wpilibc/src/main/native/include/frc/ScopedTracer.h
index 8634c1e..e700616 100644
--- a/wpilibc/src/main/native/include/frc/ScopedTracer.h
+++ b/wpilibc/src/main/native/include/frc/ScopedTracer.h
@@ -1,16 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <string>
-
-#include <wpi/StringRef.h>
-#include <wpi/Twine.h>
+#include <string_view>
 
 #include "frc/Tracer.h"
 
@@ -34,7 +29,7 @@
    * @param name The name of the epoch.
    * @param os A reference to the raw_ostream to print data to.
    */
-  ScopedTracer(wpi::Twine name, wpi::raw_ostream& os);
+  ScopedTracer(std::string_view name, wpi::raw_ostream& os);
   ~ScopedTracer();
 
   ScopedTracer(const ScopedTracer&) = delete;
diff --git a/wpilibc/src/main/native/include/frc/SensorUtil.h b/wpilibc/src/main/native/include/frc/SensorUtil.h
index ab471b1..60536b1 100644
--- a/wpilibc/src/main/native/include/frc/SensorUtil.h
+++ b/wpilibc/src/main/native/include/frc/SensorUtil.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -22,14 +19,14 @@
    *
    * @return The number of the default solenoid module.
    */
-  static int GetDefaultSolenoidModule();
+  static int GetDefaultCTREPCMModule();
 
   /**
-   * Check that the solenoid module number is valid. module numbers are 0-based
+   * Get the number of the default solenoid module.
    *
-   * @return Solenoid module is valid and present
+   * @return The number of the default solenoid module.
    */
-  static bool CheckSolenoidModule(int moduleNumber);
+  static int GetDefaultREVPHModule();
 
   /**
    * Check that the digital channel number is valid.
@@ -81,36 +78,11 @@
    */
   static bool CheckAnalogOutputChannel(int channel);
 
-  /**
-   * Verify that the solenoid channel number is within limits.
-   *
-   * @return Solenoid channel is valid
-   */
-  static bool CheckSolenoidChannel(int channel);
-
-  /**
-   * Verify that the power distribution channel number is within limits.
-   *
-   * @return PDP channel is valid
-   */
-  static bool CheckPDPChannel(int channel);
-
-  /**
-   * Verify that the PDP module number is within limits. module numbers are
-   * 0-based
-   *
-   * @return PDP module is valid
-   */
-  static bool CheckPDPModule(int module);
-
   static const int kDigitalChannels;
   static const int kAnalogInputs;
   static const int kAnalogOutputs;
-  static const int kSolenoidChannels;
-  static const int kSolenoidModules;
   static const int kPwmChannels;
   static const int kRelayChannels;
-  static const int kPDPChannels;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/SerialPort.h b/wpilibc/src/main/native/include/frc/SerialPort.h
index 7c44c75..7fff14a 100644
--- a/wpilibc/src/main/native/include/frc/SerialPort.h
+++ b/wpilibc/src/main/native/include/frc/SerialPort.h
@@ -1,20 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <string>
+#include <string_view>
 
 #include <hal/Types.h>
-#include <wpi/StringRef.h>
-#include <wpi/Twine.h>
-#include <wpi/deprecated.h>
-
-#include "frc/ErrorBase.h"
+#include <units/time.h>
 
 namespace frc {
 
@@ -30,7 +24,7 @@
  * and the NI-VISA Programmer's Reference Manual here:
  *   http://www.ni.com/pdf/manuals/370132c.pdf
  */
-class SerialPort : public ErrorBase {
+class SerialPort {
  public:
   enum Parity {
     kParity_None = 0,
@@ -68,8 +62,9 @@
    * @param stopBits The number of stop bits to use as defined by the enum
    *                 StopBits.
    */
-  SerialPort(int baudRate, Port port = kOnboard, int dataBits = 8,
-             Parity parity = kParity_None, StopBits stopBits = kStopBits_One);
+  explicit SerialPort(int baudRate, Port port = kOnboard, int dataBits = 8,
+                      Parity parity = kParity_None,
+                      StopBits stopBits = kStopBits_One);
 
   /**
    * Create an instance of a Serial Port class.
@@ -86,7 +81,7 @@
    * @param stopBits The number of stop bits to use as defined by the enum
    *                 StopBits.
    */
-  SerialPort(int baudRate, const wpi::Twine& portName, Port port = kOnboard,
+  SerialPort(int baudRate, std::string_view portName, Port port = kOnboard,
              int dataBits = 8, Parity parity = kParity_None,
              StopBits stopBits = kStopBits_One);
 
@@ -149,10 +144,10 @@
    * Use Write({data, len}) to get a buffer that is shorter than the length of
    * the string.
    *
-   * @param buffer StringRef to the buffer to read the bytes from.
+   * @param buffer the buffer to read the bytes from.
    * @return The number of bytes actually written into the port.
    */
-  int Write(wpi::StringRef buffer);
+  int Write(std::string_view buffer);
 
   /**
    * Configure the timeout of the serial port.
@@ -160,9 +155,9 @@
    * This defines the timeout for transactions with the hardware.
    * It will affect reads and very large writes.
    *
-   * @param timeout The number of seconds to to wait for I/O.
+   * @param timeout The time to wait for I/O.
    */
-  void SetTimeout(double timeout);
+  void SetTimeout(units::second_t timeout);
 
   /**
    * Specify the size of the input buffer.
diff --git a/wpilibc/src/main/native/include/frc/Servo.h b/wpilibc/src/main/native/include/frc/Servo.h
index 16b4281..b1df655 100644
--- a/wpilibc/src/main/native/include/frc/Servo.h
+++ b/wpilibc/src/main/native/include/frc/Servo.h
@@ -1,14 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include "frc/PWM.h"
-#include "frc/SpeedController.h"
 
 namespace frc {
 
@@ -68,7 +64,7 @@
    * X being set and angles of more than Y degrees result in an angle of Y being
    * set.
    *
-   * @param degrees The angle in degrees to set the servo.
+   * @param angle The angle in degrees to set the servo.
    */
   void SetAngle(double angle);
 
@@ -96,7 +92,7 @@
    */
   double GetMinAngle() const;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   double GetServoAngleRange() const;
diff --git a/wpilibc/src/main/native/include/frc/SlewRateLimiter.h b/wpilibc/src/main/native/include/frc/SlewRateLimiter.h
deleted file mode 100644
index d18fb09..0000000
--- a/wpilibc/src/main/native/include/frc/SlewRateLimiter.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <frc2/Timer.h>
-
-#include <algorithm>
-
-#include <units/time.h>
-
-namespace frc {
-/**
- * A class that limits the rate of change of an input value.  Useful for
- * implementing voltage, setpoint, and/or output ramps.  A slew-rate limit
- * is most appropriate when the quantity being controlled is a velocity or
- * a voltage; when controlling a position, consider using a TrapezoidProfile
- * instead.
- *
- * @see TrapezoidProfile
- */
-template <class Unit>
-class SlewRateLimiter {
- public:
-  using Unit_t = units::unit_t<Unit>;
-  using Rate = units::compound_unit<Unit, units::inverse<units::seconds>>;
-  using Rate_t = units::unit_t<Rate>;
-
-  /**
-   * Creates a new SlewRateLimiter with the given rate limit and initial value.
-   *
-   * @param rateLimit The rate-of-change limit.
-   * @param initialValue The initial value of the input.
-   */
-  explicit SlewRateLimiter(Rate_t rateLimit, Unit_t initialValue = Unit_t{0})
-      : m_rateLimit{rateLimit},
-        m_prevVal{initialValue},
-        m_prevTime{frc2::Timer::GetFPGATimestamp()} {}
-
-  /**
-   * Filters the input to limit its slew rate.
-   *
-   * @param input The input value whose slew rate is to be limited.
-   * @return The filtered value, which will not change faster than the slew
-   * rate.
-   */
-  Unit_t Calculate(Unit_t input) {
-    units::second_t currentTime = frc2::Timer::GetFPGATimestamp();
-    units::second_t elapsedTime = currentTime - m_prevTime;
-    m_prevVal += std::clamp(input - m_prevVal, -m_rateLimit * elapsedTime,
-                            m_rateLimit * elapsedTime);
-    m_prevTime = currentTime;
-    return m_prevVal;
-  }
-
-  /**
-   * Resets the slew rate limiter to the specified value; ignores the rate limit
-   * when doing so.
-   *
-   * @param value The value to reset to.
-   */
-  void Reset(Unit_t value) {
-    m_prevVal = value;
-    m_prevTime = frc2::Timer::GetFPGATimestamp();
-  }
-
- private:
-  Rate_t m_rateLimit;
-  Unit_t m_prevVal;
-  units::second_t m_prevTime;
-};
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Solenoid.h b/wpilibc/src/main/native/include/frc/Solenoid.h
index 9939b41..a09ffc0 100644
--- a/wpilibc/src/main/native/include/frc/Solenoid.h
+++ b/wpilibc/src/main/native/include/frc/Solenoid.h
@@ -1,46 +1,46 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <hal/Types.h>
+#include <memory>
 
-#include "frc/SolenoidBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <hal/Types.h>
+#include <units/time.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/PneumaticsBase.h"
+#include "frc/PneumaticsModuleType.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
- * Solenoid class for running high voltage Digital Output (PCM).
+ * Solenoid class for running high voltage Digital Output on a pneumatics
+ * module.
  *
  * The Solenoid class is typically used for pneumatics solenoids, but could be
- * used for any device within the current spec of the PCM.
+ * used for any device within the current spec of the module.
  */
-class Solenoid : public SolenoidBase,
-                 public Sendable,
-                 public SendableHelper<Solenoid> {
+class Solenoid : public wpi::Sendable, public wpi::SendableHelper<Solenoid> {
  public:
   /**
-   * Constructor using the default PCM ID (0).
+   * Constructs a solenoid for a specified module and type.
    *
-   * @param channel The channel on the PCM to control (0..7).
+   * @param module The module ID to use.
+   * @param moduleType The module type to use.
+   * @param channel The channel the solenoid is on.
    */
-  explicit Solenoid(int channel);
+  Solenoid(int module, PneumaticsModuleType moduleType, int channel);
 
   /**
-   * Constructor.
+   * Constructs a solenoid for a default module and specified type.
    *
-   * @param moduleNumber The CAN ID of the PCM the solenoid is attached to
-   * @param channel      The channel on the PCM to control (0..7).
+   * @param moduleType The module type to use.
+   * @param channel The channel the solenoid is on.
    */
-  Solenoid(int moduleNumber, int channel);
+  Solenoid(PneumaticsModuleType moduleType, int channel);
 
   ~Solenoid() override;
 
@@ -70,42 +70,47 @@
   void Toggle();
 
   /**
-   * Check if solenoid is blacklisted.
+   * Get the channel this solenoid is connected to.
+   */
+  int GetChannel() const;
+
+  /**
+   * Check if solenoid is Disabled.
    *
-   * If a solenoid is shorted, it is added to the blacklist and
+   * If a solenoid is shorted, it is added to the DisabledList and
    * disabled until power cycle, or until faults are cleared.
    *
    * @see ClearAllPCMStickyFaults()
    *
    * @return If solenoid is disabled due to short.
    */
-  bool IsBlackListed() const;
+  bool IsDisabled() const;
 
   /**
    * Set the pulse duration in the PCM. This is used in conjunction with
    * the startPulse method to allow the PCM to control the timing of a pulse.
    * The timing can be controlled in 0.01 second increments.
    *
-   * @param durationSeconds The duration of the pulse, from 0.01 to 2.55
-   *                        seconds.
+   * @param duration The duration of the pulse, from 0.01 to 2.55 seconds.
    *
    * @see startPulse()
    */
-  void SetPulseDuration(double durationSeconds);
+  void SetPulseDuration(units::second_t duration);
 
   /**
-   * Trigger the PCM to generate a pulse of the duration set in
+   * %Trigger the PCM to generate a pulse of the duration set in
    * setPulseDuration.
    *
    * @see setPulseDuration()
    */
   void StartPulse();
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
-  hal::Handle<HAL_SolenoidHandle> m_solenoidHandle;
-  int m_channel;  // The channel on the module to control
+  std::shared_ptr<PneumaticsBase> m_module;
+  int m_mask;
+  int m_channel;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/SolenoidBase.h b/wpilibc/src/main/native/include/frc/SolenoidBase.h
deleted file mode 100644
index 314df5c..0000000
--- a/wpilibc/src/main/native/include/frc/SolenoidBase.h
+++ /dev/null
@@ -1,127 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/ErrorBase.h"
-
-namespace frc {
-
-/**
- * SolenoidBase class is the common base class for the Solenoid and
- * DoubleSolenoid classes.
- */
-class SolenoidBase : public ErrorBase {
- public:
-  /**
-   * Read all 8 solenoids as a single byte
-   *
-   * @param module the module to read from
-   * @return The current value of all 8 solenoids on the module.
-   */
-  static int GetAll(int module);
-
-  /**
-   * Read all 8 solenoids as a single byte
-   *
-   * @return The current value of all 8 solenoids on the module.
-   */
-  int GetAll() const;
-
-  /**
-   * Reads complete solenoid blacklist for all 8 solenoids as a single byte.
-   *
-   * If a solenoid is shorted, it is added to the blacklist and
-   * disabled until power cycle, or until faults are cleared.
-   * @see ClearAllPCMStickyFaults()
-   *
-   * @param module the module to read from
-   * @return The solenoid blacklist of all 8 solenoids on the module.
-   */
-  static int GetPCMSolenoidBlackList(int module);
-
-  /**
-   * Reads complete solenoid blacklist for all 8 solenoids as a single byte.
-   *
-   * If a solenoid is shorted, it is added to the blacklist and
-   * disabled until power cycle, or until faults are cleared.
-   * @see ClearAllPCMStickyFaults()
-   *
-   * @return The solenoid blacklist of all 8 solenoids on the module.
-   */
-  int GetPCMSolenoidBlackList() const;
-
-  /**
-   * @param module the module to read from
-   * @return true if PCM sticky fault is set : The common highside solenoid
-   *         voltage rail is too low, most likely a solenoid channel is shorted.
-   */
-  static bool GetPCMSolenoidVoltageStickyFault(int module);
-
-  /**
-   * @return true if PCM sticky fault is set : The common highside solenoid
-   *         voltage rail is too low, most likely a solenoid channel is shorted.
-   */
-  bool GetPCMSolenoidVoltageStickyFault() const;
-
-  /**
-   * @param module the module to read from
-   * @return true if PCM is in fault state : The common highside solenoid
-   *         voltage rail is too low, most likely a solenoid channel is shorted.
-   */
-  static bool GetPCMSolenoidVoltageFault(int module);
-
-  /**
-   * @return true if PCM is in fault state : The common highside solenoid
-   *         voltage rail is too low, most likely a solenoid channel is shorted.
-   */
-  bool GetPCMSolenoidVoltageFault() const;
-
-  /**
-   * Clear ALL sticky faults inside PCM that Compressor is wired to.
-   *
-   * If a sticky fault is set, then it will be persistently cleared.  Compressor
-   * drive maybe momentarily disable while flags are being cleared. Care should
-   * be taken to not call this too frequently, otherwise normal compressor
-   * functionality may be prevented.
-   *
-   * If no sticky faults are set then this call will have no effect.
-   *
-   * @param module the module to read from
-   */
-  static void ClearAllPCMStickyFaults(int module);
-
-  /**
-   * Clear ALL sticky faults inside PCM that Compressor is wired to.
-   *
-   * If a sticky fault is set, then it will be persistently cleared.  Compressor
-   * drive maybe momentarily disable while flags are being cleared. Care should
-   * be taken to not call this too frequently, otherwise normal compressor
-   * functionality may be prevented.
-   *
-   * If no sticky faults are set then this call will have no effect.
-   */
-  void ClearAllPCMStickyFaults();
-
- protected:
-  /**
-   * Constructor.
-   *
-   * @param moduleNumber The CAN PCM ID.
-   */
-  explicit SolenoidBase(int pcmID);
-
-  SolenoidBase(SolenoidBase&&) = default;
-  SolenoidBase& operator=(SolenoidBase&&) = default;
-
-  static constexpr int m_maxModules = 63;
-  static constexpr int m_maxPorts = 8;
-
-  int m_moduleNumber;  // PCM module number
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/SpeedController.h b/wpilibc/src/main/native/include/frc/SpeedController.h
index 3053c3b..8473015 100644
--- a/wpilibc/src/main/native/include/frc/SpeedController.h
+++ b/wpilibc/src/main/native/include/frc/SpeedController.h
@@ -1,22 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <units/voltage.h>
-
-#include "frc/PIDOutput.h"
+#include <wpi/deprecated.h>
 
 namespace frc {
 
 /**
  * Interface for speed controlling devices.
+ *
+ * @deprecated Use MotorController.
  */
-class SpeedController : public PIDOutput {
+class WPI_DEPRECATED("use MotorController") SpeedController {
  public:
   virtual ~SpeedController() = default;
 
diff --git a/wpilibc/src/main/native/include/frc/SpeedControllerGroup.h b/wpilibc/src/main/native/include/frc/SpeedControllerGroup.h
index e62563c..5a097b5 100644
--- a/wpilibc/src/main/native/include/frc/SpeedControllerGroup.h
+++ b/wpilibc/src/main/native/include/frc/SpeedControllerGroup.h
@@ -1,24 +1,29 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
 #include <vector>
 
-#include "frc/SpeedController.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/deprecated.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/motorcontrol/MotorController.h"
 
 namespace frc {
 
-class SpeedControllerGroup : public Sendable,
-                             public SpeedController,
-                             public SendableHelper<SpeedControllerGroup> {
+/**
+ * Allows multiple SpeedController objects to be linked together.
+ *
+ * @deprecated Use MotorControllerGroup.
+ */
+class WPI_DEPRECATED("use MotorControllerGroup") SpeedControllerGroup
+    : public wpi::Sendable,
+      public MotorController,
+      public wpi::SendableHelper<SpeedControllerGroup> {
  public:
   template <class... SpeedControllers>
   explicit SpeedControllerGroup(SpeedController& speedController,
@@ -35,9 +40,8 @@
   bool GetInverted() const override;
   void Disable() override;
   void StopMotor() override;
-  void PIDWrite(double output) override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   bool m_isInverted = false;
diff --git a/wpilibc/src/main/native/include/frc/SpeedControllerGroup.inc b/wpilibc/src/main/native/include/frc/SpeedControllerGroup.inc
index d9e773d..d5f17b4 100644
--- a/wpilibc/src/main/native/include/frc/SpeedControllerGroup.inc
+++ b/wpilibc/src/main/native/include/frc/SpeedControllerGroup.inc
@@ -1,15 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
 #include <vector>
 
+#include "frc/SpeedControllerGroup.h"
+
 namespace frc {
 
 template <class... SpeedControllers>
diff --git a/wpilibc/src/main/native/include/frc/SynchronousInterrupt.h b/wpilibc/src/main/native/include/frc/SynchronousInterrupt.h
new file mode 100644
index 0000000..03cc4f8
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/SynchronousInterrupt.h
@@ -0,0 +1,106 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include <hal/Types.h>
+#include <units/time.h>
+
+namespace frc {
+class DigitalSource;
+
+/**
+ * Class for handling synchronous (blocking) interrupts.
+ *
+ * <p> By default, interrupts will occur on rising edge.
+ *
+ * <p> Asynchronous interrupts are handled by the AsynchronousInterrupt class.
+ */
+class SynchronousInterrupt {
+ public:
+  enum WaitResult {
+    kTimeout = 0x0,
+    kRisingEdge = 0x1,
+    kFallingEdge = 0x100,
+    kBoth = 0x101,
+  };
+
+  /**
+   * Construct a Synchronous Interrupt from a Digital Source.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   */
+  explicit SynchronousInterrupt(DigitalSource& source);
+
+  /**
+   * Construct a Synchronous Interrupt from a Digital Source.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   */
+  explicit SynchronousInterrupt(DigitalSource* source);
+
+  /**
+   * Construct a Synchronous Interrupt from a Digital Source.
+   *
+   * @param source the DigitalSource the interrupts are triggered from
+   */
+  explicit SynchronousInterrupt(std::shared_ptr<DigitalSource> source);
+
+  ~SynchronousInterrupt();
+
+  SynchronousInterrupt(SynchronousInterrupt&&) = default;
+  SynchronousInterrupt& operator=(SynchronousInterrupt&&) = default;
+
+  /**
+   * Wait for an interrupt to occur.
+   *
+   * <p> Both rising and falling edge can be returned if both a rising and
+   * falling happened between calls, and ignorePrevious is false.
+   *
+   * @param timeout The timeout to wait for. 0s or less will return immediately.
+   * @param ignorePrevious True to ignore any previous interrupts, false to
+   * return interrupt value if an interrupt has occured since last call.
+   * @return The edge(s) that were triggered, or timeout.
+   */
+  WaitResult WaitForInterrupt(units::second_t timeout,
+                              bool ignorePrevious = true);
+
+  /**
+   * Set which edges cause an interrupt to occur.
+   *
+   * @param risingEdge true to trigger on rising edge, false otherwise.
+   * @param fallingEdge true to trigger on falling edge, false otherwise
+   */
+  void SetInterruptEdges(bool risingEdge, bool fallingEdge);
+
+  /**
+   * Get the timestamp (relative to FPGA Time) of the last rising edge.
+   *
+   * @return the timestamp in seconds relative to getFPGATime
+   */
+  units::second_t GetRisingTimestamp();
+
+  /**
+   * Get the timestamp of the last falling edge.
+   *
+   * <p>This function does not require the interrupt to be enabled to work.
+   *
+   * <p>This only works if falling edge was configured using setInterruptEdges.
+   * @return the timestamp in seconds relative to getFPGATime
+   */
+  units::second_t GetFallingTimestamp();
+
+  /**
+   * Wake up an existing wait call. Can be called from any thread.
+   */
+  void WakeupWaitingInterrupt();
+
+ private:
+  void InitSynchronousInterrupt();
+  std::shared_ptr<DigitalSource> m_source;
+  hal::Handle<HAL_InterruptHandle> m_handle;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Talon.h b/wpilibc/src/main/native/include/frc/Talon.h
deleted file mode 100644
index 6e92dfc..0000000
--- a/wpilibc/src/main/native/include/frc/Talon.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Cross the Road Electronics (CTRE) Talon and Talon SR Speed Controller.
- *
- * Note that the Talon uses the following bounds for PWM values. These values
- * should work reasonably well for most controllers, but if users experience
- * issues such as asymmetric behavior around the deadband or inability to
- * saturate the controller in either direction, calibration is recommended.
- * The calibration procedure can be found in the Talon User Manual available
- * from CTRE.
- *
- * \li 2.037ms = full "forward"
- * \li 1.539ms = the "high end" of the deadband range
- * \li 1.513ms = center of the deadband range (off)
- * \li 1.487ms = the "low end" of the deadband range
- * \li 0.989ms = full "reverse"
- */
-class Talon : public PWMSpeedController {
- public:
-  /**
-   * Constructor for a Talon (original or Talon SR).
-   *
-   * @param channel The PWM channel number that the Talon is attached to. 0-9
-   *                are on-board, 10-19 are on the MXP port
-   */
-  explicit Talon(int channel);
-
-  Talon(Talon&&) = default;
-  Talon& operator=(Talon&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Threads.h b/wpilibc/src/main/native/include/frc/Threads.h
index 3c44961..5822670 100644
--- a/wpilibc/src/main/native/include/frc/Threads.h
+++ b/wpilibc/src/main/native/include/frc/Threads.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -15,43 +12,45 @@
  * Get the thread priority for the specified thread.
  *
  * @param thread     Reference to the thread to get the priority for.
- * @param isRealTime Set to true if thread is realtime, otherwise false.
- * @return The current thread priority. Scaled 1-99, with 1 being highest.
+ * @param isRealTime Set to true if thread is real-time, otherwise false.
+ * @return           The current thread priority. For real-time, this is 1-99
+ *                   with 99 being highest. For non-real-time, this is 0. See
+ *                   "man 7 sched" for details.
  */
 int GetThreadPriority(std::thread& thread, bool* isRealTime);
 
 /**
- * Get the thread priority for the current thread
+ * Get the thread priority for the current thread.
  *
- * @param isRealTime Set to true if thread is realtime, otherwise false.
- * @return The current thread priority. Scaled 1-99.
+ * @param isRealTime Set to true if thread is real-time, otherwise false.
+ * @return           The current thread priority. For real-time, this is 1-99
+ *                   with 99 being highest. For non-real-time, this is 0. See
+ *                   "man 7 sched" for details.
  */
 int GetCurrentThreadPriority(bool* isRealTime);
 
 /**
- * Sets the thread priority for the specified thread
+ * Sets the thread priority for the specified thread.
  *
  * @param thread   Reference to the thread to set the priority of.
- * @param realTime Set to true to set a realtime priority, false for standard
+ * @param realTime Set to true to set a real-time priority, false for standard
  *                 priority.
- * @param priority Priority to set the thread to. Scaled 1-99, with 1 being
- *                 highest. On RoboRIO, priority is ignored for non realtime
- *                 setting.
- *
- * @return The success state of setting the priority
+ * @param priority Priority to set the thread to. For real-time, this is 1-99
+ *                 with 99 being highest. For non-real-time, this is forced to
+ *                 0. See "man 7 sched" for more details.
+ * @return         True on success.
  */
 bool SetThreadPriority(std::thread& thread, bool realTime, int priority);
 
 /**
- * Sets the thread priority for the current thread
+ * Sets the thread priority for the current thread.
  *
- * @param realTime Set to true to set a realtime priority, false for standard
+ * @param realTime Set to true to set a real-time priority, false for standard
  *                 priority.
- * @param priority Priority to set the thread to. Scaled 1-99, with 1 being
- *                 highest. On RoboRIO, priority is ignored for non realtime
- *                 setting.
- *
- * @return The success state of setting the priority
+ * @param priority Priority to set the thread to. For real-time, this is 1-99
+ *                 with 99 being highest. For non-real-time, this is forced to
+ *                 0. See "man 7 sched" for more details.
+ * @return         True on success.
  */
 bool SetCurrentThreadPriority(bool realTime, int priority);
 
diff --git a/wpilibc/src/main/native/include/frc/TimedRobot.h b/wpilibc/src/main/native/include/frc/TimedRobot.h
index 9dbc3f2..cc64c03 100644
--- a/wpilibc/src/main/native/include/frc/TimedRobot.h
+++ b/wpilibc/src/main/native/include/frc/TimedRobot.h
@@ -1,13 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
+#include <utility>
 #include <vector>
 
 #include <hal/Types.h>
@@ -16,9 +14,8 @@
 #include <wpi/deprecated.h>
 #include <wpi/priority_queue.h>
 
-#include "frc/ErrorBase.h"
 #include "frc/IterativeRobotBase.h"
-#include "frc2/Timer.h"
+#include "frc/Timer.h"
 
 namespace frc {
 
@@ -31,9 +28,9 @@
  * Periodic() functions from the base class are called on an interval by a
  * Notifier instance.
  */
-class TimedRobot : public IterativeRobotBase, public ErrorBase {
+class TimedRobot : public IterativeRobotBase {
  public:
-  static constexpr units::second_t kDefaultPeriod = 20_ms;
+  static constexpr auto kDefaultPeriod = 20_ms;
 
   /**
    * Provide an alternate "main loop" via StartCompetition().
@@ -46,11 +43,6 @@
   void EndCompetition() override;
 
   /**
-   * Get the time period between calls to Periodic() functions.
-   */
-  units::second_t GetPeriod() const;
-
-  /**
    * Constructor for TimedRobot.
    *
    * @deprecated use unit safe constructor instead.
@@ -105,14 +97,13 @@
      */
     Callback(std::function<void()> func, units::second_t startTime,
              units::second_t period, units::second_t offset)
-        : func{func},
+        : func{std::move(func)},
           period{period},
-          expirationTime{
-              startTime + offset +
-              units::math::floor((frc2::Timer::GetFPGATimestamp() - startTime) /
-                                 period) *
-                  period +
-              period} {}
+          expirationTime{startTime + offset +
+                         units::math::floor(
+                             (Timer::GetFPGATimestamp() - startTime) / period) *
+                             period +
+                         period} {}
 
     bool operator>(const Callback& rhs) const {
       return expirationTime > rhs.expirationTime;
diff --git a/wpilibc/src/main/native/include/frc/Timer.h b/wpilibc/src/main/native/include/frc/Timer.h
index ac166c5..0aed658 100644
--- a/wpilibc/src/main/native/include/frc/Timer.h
+++ b/wpilibc/src/main/native/include/frc/Timer.h
@@ -1,13 +1,11 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc2/Timer.h"
+#include <units/time.h>
+#include <wpi/deprecated.h>
 
 namespace frc {
 
@@ -21,23 +19,20 @@
  *
  * @param seconds Length of time to pause, in seconds.
  */
-void Wait(double seconds);
+void Wait(units::second_t seconds);
 
 /**
  * @brief  Gives real-time clock system time with nanosecond resolution
  * @return The time, just in case you want the robot to start autonomous at 8pm
  *         on Saturday.
  */
-double GetTime();
+units::second_t GetTime();
 
 /**
- * Timer objects measure accumulated time in seconds.
+ * A timer class.
  *
- * The timer object functions like a stopwatch. It can be started, stopped, and
- * cleared. When the timer is running its value counts up in seconds. When
- * stopped, the timer holds the current value. The implementation simply records
- * the time when started and subtracts the current time whenever the value is
- * requested.
+ * Note that if the user calls frc::sim::RestartTiming(), they should also reset
+ * the timer so Get() won't return a negative duration.
  */
 class Timer {
  public:
@@ -51,10 +46,10 @@
 
   virtual ~Timer() = default;
 
-  Timer(const Timer& rhs) = default;
-  Timer& operator=(const Timer& rhs) = default;
-  Timer(Timer&& rhs) = default;
-  Timer& operator=(Timer&& rhs) = default;
+  Timer(const Timer&) = default;
+  Timer& operator=(const Timer&) = default;
+  Timer(Timer&&) = default;
+  Timer& operator=(Timer&&) = default;
 
   /**
    * Get the current time from the timer. If the clock is running it is derived
@@ -63,7 +58,7 @@
    *
    * @return Current time value for this timer in seconds
    */
-  double Get() const;
+  units::second_t Get() const;
 
   /**
    * Reset the timer by setting the time to 0.
@@ -77,7 +72,8 @@
    * Start the timer running.
    *
    * Just set the running flag to true indicating that all time requests should
-   * be relative to the system clock.
+   * be relative to the system clock. Note that this method is a no-op if the
+   * timer is already running.
    */
   void Start();
 
@@ -91,14 +87,34 @@
   void Stop();
 
   /**
+   * Check if the period specified has passed.
+   *
+   * @param period The period to check.
+   * @return       True if the period has passed.
+   */
+  bool HasElapsed(units::second_t period) const;
+
+  /**
    * Check if the period specified has passed and if it has, advance the start
    * time by that period. This is useful to decide if it's time to do periodic
    * work without drifting later by the time it took to get around to checking.
    *
-   * @param period The period to check for (in seconds).
+   * @param period The period to check for.
+   * @return       True if the period has passed.
+   * @deprecated Use AdvanceIfElapsed() instead.
+   */
+  WPI_DEPRECATED("Use AdvanceIfElapsed() instead.")
+  bool HasPeriodPassed(units::second_t period);
+
+  /**
+   * Check if the period specified has passed and if it has, advance the start
+   * time by that period. This is useful to decide if it's time to do periodic
+   * work without drifting later by the time it took to get around to checking.
+   *
+   * @param period The period to check for.
    * @return       True if the period has passed.
    */
-  bool HasPeriodPassed(double period);
+  bool AdvanceIfElapsed(units::second_t period);
 
   /**
    * Return the FPGA system clock time in seconds.
@@ -108,7 +124,7 @@
    *
    * @returns Robot running time in seconds.
    */
-  static double GetFPGATimestamp();
+  static units::second_t GetFPGATimestamp();
 
   /**
    * Return the approximate match time.
@@ -125,10 +141,12 @@
    *
    * @return Time remaining in current match period (auto or teleop)
    */
-  static double GetMatchTime();
+  static units::second_t GetMatchTime();
 
  private:
-  frc2::Timer m_timer;
+  units::second_t m_startTime = 0_s;
+  units::second_t m_accumulatedTime = 0_s;
+  bool m_running = false;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/TimesliceRobot.h b/wpilibc/src/main/native/include/frc/TimesliceRobot.h
new file mode 100644
index 0000000..bc045d5
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/TimesliceRobot.h
@@ -0,0 +1,120 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <functional>
+
+#include <units/time.h>
+
+#include "frc/TimedRobot.h"
+
+namespace frc {
+
+/**
+ * TimesliceRobot extends the TimedRobot robot program framework to provide
+ * timeslice scheduling of periodic functions.
+ *
+ * The TimesliceRobot class is intended to be subclassed by a user creating a
+ * robot program.
+ *
+ * This class schedules robot operations serially in a timeslice format.
+ * TimedRobot's periodic functions are the first in the timeslice table with 0
+ * ms offset and 20 ms period. You can schedule additional controller periodic
+ * functions at a shorter period (5 ms by default). You give each one a
+ * timeslice duration, then they're run sequentially. The main benefit of this
+ * approach is consistent starting times for each controller periodic, which can
+ * make odometry and estimators more accurate and controller outputs change more
+ * consistently.
+ *
+ * Here's an example of measured subsystem durations and their timeslice
+ * allocations:
+ *
+ * <table>
+ *   <tr>
+ *     <td><b>Subsystem</b></td>
+ *     <td><b>Duration (ms)</b></td>
+ *     <td><b>Allocation (ms)</b></td>
+ *   </tr>
+ *   <tr>
+ *     <td><b>Total</b></td>
+ *     <td>5.0</td>
+ *     <td>5.0</td>
+ *   </tr>
+ *   <tr>
+ *     <td>TimedRobot</td>
+ *     <td>?</td>
+ *     <td>2.0</td>
+ *   </tr>
+ *   <tr>
+ *     <td>Drivetrain</td>
+ *     <td>1.32</td>
+ *     <td>1.5</td>
+ *   </tr>
+ *   <tr>
+ *     <td>Flywheel</td>
+ *     <td>0.6</td>
+ *     <td>0.7</td>
+ *   </tr>
+ *   <tr>
+ *     <td>Turret</td>
+ *     <td>0.6</td>
+ *     <td>0.8</td>
+ *   </tr>
+ *   <tr>
+ *     <td><b>Free</b></td>
+ *     <td>0.0</td>
+ *     <td>N/A</td>
+ *   </tr>
+ * </table>
+ *
+ * Since TimedRobot periodic functions only run every 20ms, that leaves a 2 ms
+ * empty spot in the allocation table for three of the four 5 ms cycles
+ * comprising 20 ms. That's OK because the OS needs time to do other things.
+ *
+ * If the robot periodic functions and the controller periodic functions have a
+ * lot of scheduling jitter that cause them to occasionally overlap with later
+ * timeslices, consider giving the main robot thread a real-time priority using
+ * frc::SetCurrentThreadPriority(). An RT priority of 15 is a reasonable choice.
+ *
+ * If you do enable RT though, <i>make sure your periodic functions do not
+ * block</i>. If they do, the operating system will lock up, and you'll have to
+ * boot the roboRIO into safe mode and delete the robot program to recover.
+ */
+class TimesliceRobot : public TimedRobot {
+ public:
+  /**
+   * Constructor for TimesliceRobot.
+   *
+   * @param robotPeriodicAllocation The allocation to give the TimesliceRobot
+   *                                periodic functions.
+   * @param controllerPeriod The controller period. The sum of all scheduler
+   *                         allocations should be less than or equal to this
+   *                         value.
+   */
+  explicit TimesliceRobot(units::second_t robotPeriodicAllocation,
+                          units::second_t controllerPeriod);
+
+  /**
+   * Schedule a periodic function with the constructor's controller period and
+   * the given allocation. The function's runtime allocation will be placed
+   * after the end of the previous one's.
+   *
+   * If a call to this function makes the allocations exceed the controller
+   * period, an exception will be thrown since that means the TimesliceRobot
+   * periodic functions and the given function will have conflicting
+   * timeslices.
+   *
+   * @param func       Function to schedule.
+   * @param allocation The function's runtime allocation out of the controller
+   *                   period.
+   */
+  void Schedule(std::function<void()> func, units::second_t allocation);
+
+ private:
+  units::second_t m_nextOffset;
+  units::second_t m_controllerPeriod;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/Tracer.h b/wpilibc/src/main/native/include/frc/Tracer.h
index 627b07b..2acb017 100644
--- a/wpilibc/src/main/native/include/frc/Tracer.h
+++ b/wpilibc/src/main/native/include/frc/Tracer.h
@@ -1,17 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <chrono>
+#include <string_view>
 
 #include <hal/cpp/fpga_clock.h>
 #include <wpi/StringMap.h>
-#include <wpi/StringRef.h>
 
 namespace wpi {
 class raw_ostream;
@@ -51,7 +48,7 @@
    *
    * @param epochName The name to associate with the epoch.
    */
-  void AddEpoch(wpi::StringRef epochName);
+  void AddEpoch(std::string_view epochName);
 
   /**
    * Prints list of epochs added so far and their times to the DriverStation.
diff --git a/wpilibc/src/main/native/include/frc/Ultrasonic.h b/wpilibc/src/main/native/include/frc/Ultrasonic.h
index f6d301b..253192f 100644
--- a/wpilibc/src/main/native/include/frc/Ultrasonic.h
+++ b/wpilibc/src/main/native/include/frc/Ultrasonic.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -13,12 +10,13 @@
 #include <vector>
 
 #include <hal/SimDevice.h>
+#include <units/length.h>
+#include <units/time.h>
+#include <units/velocity.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/Counter.h"
-#include "frc/ErrorBase.h"
-#include "frc/PIDSource.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
@@ -37,13 +35,9 @@
  * received. The time that the line is high determines the round trip distance
  * (time of flight).
  */
-class Ultrasonic : public ErrorBase,
-                   public Sendable,
-                   public PIDSource,
-                   public SendableHelper<Ultrasonic> {
+class Ultrasonic : public wpi::Sendable,
+                   public wpi::SendableHelper<Ultrasonic> {
  public:
-  enum DistanceUnit { kInches = 0, kMilliMeters = 1 };
-
   /**
    * Create an instance of the Ultrasonic Sensor.
    *
@@ -54,9 +48,8 @@
    * @param echoChannel The digital input channel that receives the echo. The
    *                    length of time that the echo is high represents the
    *                    round trip time of the ping, and the distance.
-   * @param units       The units returned in either kInches or kMilliMeters
    */
-  Ultrasonic(int pingChannel, int echoChannel, DistanceUnit units = kInches);
+  Ultrasonic(int pingChannel, int echoChannel);
 
   /**
    * Create an instance of an Ultrasonic Sensor from a DigitalInput for the echo
@@ -66,10 +59,8 @@
    *                    ping. Requires a 10uS pulse to start.
    * @param echoChannel The digital input object that times the return pulse to
    *                    determine the range.
-   * @param units       The units returned in either kInches or kMilliMeters
    */
-  Ultrasonic(DigitalOutput* pingChannel, DigitalInput* echoChannel,
-             DistanceUnit units = kInches);
+  Ultrasonic(DigitalOutput* pingChannel, DigitalInput* echoChannel);
 
   /**
    * Create an instance of an Ultrasonic Sensor from a DigitalInput for the echo
@@ -79,10 +70,8 @@
    *                    ping. Requires a 10uS pulse to start.
    * @param echoChannel The digital input object that times the return pulse to
    *                    determine the range.
-   * @param units       The units returned in either kInches or kMilliMeters
    */
-  Ultrasonic(DigitalOutput& pingChannel, DigitalInput& echoChannel,
-             DistanceUnit units = kInches);
+  Ultrasonic(DigitalOutput& pingChannel, DigitalInput& echoChannel);
 
   /**
    * Create an instance of an Ultrasonic Sensor from a DigitalInput for the echo
@@ -92,17 +81,17 @@
    *                    ping. Requires a 10uS pulse to start.
    * @param echoChannel The digital input object that times the return pulse to
    *                    determine the range.
-   * @param units       The units returned in either kInches or kMilliMeters
    */
   Ultrasonic(std::shared_ptr<DigitalOutput> pingChannel,
-             std::shared_ptr<DigitalInput> echoChannel,
-             DistanceUnit units = kInches);
+             std::shared_ptr<DigitalInput> echoChannel);
 
   ~Ultrasonic() override;
 
   Ultrasonic(Ultrasonic&&) = default;
   Ultrasonic& operator=(Ultrasonic&&) = default;
 
+  int GetEchoChannel() const;
+
   /**
    * Single ping to ultrasonic sensor.
    *
@@ -138,52 +127,19 @@
   static void SetAutomaticMode(bool enabling);
 
   /**
-   * Get the range in inches from the ultrasonic sensor.
+   * Get the range from the ultrasonic sensor.
    *
-   * @return Range in inches of the target returned from the ultrasonic sensor.
-   *         If there is no valid value yet, i.e. at least one measurement
-   *         hasn't completed, then return 0.
+   * @return Range of the target returned from the ultrasonic sensor. If there
+   *         is no valid value yet, i.e. at least one measurement hasn't
+   *         completed, then return 0.
    */
-  double GetRangeInches() const;
-
-  /**
-   * Get the range in millimeters from the ultrasonic sensor.
-   *
-   * @return Range in millimeters of the target returned by the ultrasonic
-   *         sensor. If there is no valid value yet, i.e. at least one
-   *         measurement hasn't completed, then return 0.
-   */
-  double GetRangeMM() const;
+  units::meter_t GetRange() const;
 
   bool IsEnabled() const;
 
   void SetEnabled(bool enable);
 
-  /**
-   * Set the current DistanceUnit that should be used for the PIDSource base
-   * object.
-   *
-   * @param units The DistanceUnit that should be used.
-   */
-  void SetDistanceUnits(DistanceUnit units);
-
-  /**
-   * Get the current DistanceUnit that is used for the PIDSource base object.
-   *
-   * @return The type of DistanceUnit that is being used.
-   */
-  DistanceUnit GetDistanceUnits() const;
-
-  /**
-   * Get the range in the current DistanceUnit for the PIDSource base object.
-   *
-   * @return The range in DistanceUnit
-   */
-  double PIDGet() override;
-
-  void SetPIDSourceType(PIDSourceType pidSource) override;
-
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   /**
@@ -215,8 +171,8 @@
   static constexpr int kPriority = 64;
 
   // Max time (ms) between readings.
-  static constexpr double kMaxUltrasonicTime = 0.1;
-  static constexpr double kSpeedOfSoundInchesPerSec = 1130.0 * 12.0;
+  static constexpr auto kMaxUltrasonicTime = 0.1_s;
+  static constexpr auto kSpeedOfSound = 1130_fps;
 
   // Thread doing the round-robin automatic sensing
   static std::thread m_thread;
@@ -231,7 +187,6 @@
   std::shared_ptr<DigitalInput> m_echoChannel;
   bool m_enabled = false;
   Counter m_counter;
-  DistanceUnit m_units;
 
   hal::SimDevice m_simDevice;
   hal::SimBoolean m_simRangeValid;
diff --git a/wpilibc/src/main/native/include/frc/Utility.h b/wpilibc/src/main/native/include/frc/Utility.h
deleted file mode 100644
index a02e583..0000000
--- a/wpilibc/src/main/native/include/frc/Utility.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-/**
- * @file Contains global utility functions
- */
-
-#include <wpi/StringRef.h>
-#include <wpi/Twine.h>
-
-#define wpi_assert(condition) \
-  wpi_assert_impl(condition, #condition, "", __FILE__, __LINE__, __FUNCTION__)
-#define wpi_assertWithMessage(condition, message)                     \
-  wpi_assert_impl(condition, #condition, message, __FILE__, __LINE__, \
-                  __FUNCTION__)
-
-#define wpi_assertEqual(a, b) \
-  wpi_assertEqual_impl(a, b, #a, #b, "", __FILE__, __LINE__, __FUNCTION__)
-#define wpi_assertEqualWithMessage(a, b, message) \
-  wpi_assertEqual_impl(a, b, #a, #b, message, __FILE__, __LINE__, __FUNCTION__)
-
-#define wpi_assertNotEqual(a, b) \
-  wpi_assertNotEqual_impl(a, b, #a, #b, "", __FILE__, __LINE__, __FUNCTION__)
-#define wpi_assertNotEqualWithMessage(a, b, message)                 \
-  wpi_assertNotEqual_impl(a, b, #a, #b, message, __FILE__, __LINE__, \
-                          __FUNCTION__)
-
-/**
- * Assert implementation.
- *
- * This allows breakpoints to be set on an assert. The users don't call this,
- * but instead use the wpi_assert macros in Utility.h.
- */
-bool wpi_assert_impl(bool conditionValue, const wpi::Twine& conditionText,
-                     const wpi::Twine& message, wpi::StringRef fileName,
-                     int lineNumber, wpi::StringRef funcName);
-
-/**
- * Assert equal implementation.
- *
- * This determines whether the two given integers are equal. If not, the value
- * of each is printed along with an optional message string. The users don't
- * call this, but instead use the wpi_assertEqual macros in Utility.h.
- */
-bool wpi_assertEqual_impl(int valueA, int valueB,
-                          const wpi::Twine& valueAString,
-                          const wpi::Twine& valueBString,
-                          const wpi::Twine& message, wpi::StringRef fileName,
-                          int lineNumber, wpi::StringRef funcName);
-
-/**
- * Assert not equal implementation.
- *
- * This determines whether the two given integers are equal. If so, the value of
- * each is printed along with an optional message string. The users don't call
- * this, but instead use the wpi_assertNotEqual macros in Utility.h.
- */
-bool wpi_assertNotEqual_impl(int valueA, int valueB,
-                             const wpi::Twine& valueAString,
-                             const wpi::Twine& valueBString,
-                             const wpi::Twine& message, wpi::StringRef fileName,
-                             int lineNumber, wpi::StringRef funcName);
diff --git a/wpilibc/src/main/native/include/frc/Victor.h b/wpilibc/src/main/native/include/frc/Victor.h
deleted file mode 100644
index 89c4a89..0000000
--- a/wpilibc/src/main/native/include/frc/Victor.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Vex Robotics Victor 888 Speed Controller.
- *
- * The Vex Robotics Victor 884 Speed Controller can also be used with this
- * class but may need to be calibrated per the Victor 884 user manual.
- *
- * Note that the Victor uses the following bounds for PWM values.  These
- * values were determined empirically and optimized for the Victor 888. These
- * values should work reasonably well for Victor 884 controllers as well but
- * if users experience issues such as asymmetric behavior around the deadband
- * or inability to saturate the controller in either direction, calibration is
- * recommended. The calibration procedure can be found in the Victor 884 User
- * Manual available from Vex.
- *
- * \li 2.027ms = full "forward"
- * \li 1.525ms = the "high end" of the deadband range
- * \li 1.507ms = center of the deadband range (off)
- * \li 1.490ms = the "low end" of the deadband range
- * \li 1.026ms = full "reverse"
- */
-class Victor : public PWMSpeedController {
- public:
-  /**
-   * Constructor for a Victor.
-   *
-   * @param channel The PWM channel number that the Victor is attached to. 0-9
-   *                are on-board, 10-19 are on the MXP port
-   */
-  explicit Victor(int channel);
-
-  Victor(Victor&&) = default;
-  Victor& operator=(Victor&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/VictorSP.h b/wpilibc/src/main/native/include/frc/VictorSP.h
deleted file mode 100644
index d8aa8e8..0000000
--- a/wpilibc/src/main/native/include/frc/VictorSP.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PWMSpeedController.h"
-
-namespace frc {
-
-/**
- * Vex Robotics Victor SP Speed Controller.
- *
- * Note that the Victor SP uses the following bounds for PWM values. These
- * values should work reasonably well for most controllers, but if users
- * experience issues such as asymmetric behavior around the deadband or
- * inability to saturate the controller in either direction, calibration is
- * recommended. The calibration procedure can be found in the Victor SP User
- * Manual available from Vex.
- *
- * \li 2.004ms = full "forward"
- * \li 1.520ms = the "high end" of the deadband range
- * \li 1.500ms = center of the deadband range (off)
- * \li 1.480ms = the "low end" of the deadband range
- * \li 0.997ms = full "reverse"
- */
-class VictorSP : public PWMSpeedController {
- public:
-  /**
-   * Constructor for a Victor SP.
-   *
-   * @param channel The PWM channel that the VictorSP is attached to. 0-9 are
-   *                on-board, 10-19 are on the MXP port
-   */
-  explicit VictorSP(int channel);
-
-  VictorSP(VictorSP&&) = default;
-  VictorSP& operator=(VictorSP&&) = default;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/WPIErrors.h b/wpilibc/src/main/native/include/frc/WPIErrors.h
deleted file mode 100644
index 8325c92..0000000
--- a/wpilibc/src/main/native/include/frc/WPIErrors.h
+++ /dev/null
@@ -1,95 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <stdint.h>
-
-#define S(label, offset, message)                                        \
-  constexpr inline const char* wpi_error_s_##label() { return message; } \
-  constexpr inline int wpi_error_value_##label() { return offset; }
-
-// Fatal errors
-S(ModuleIndexOutOfRange, -1,
-  "Allocating module that is out of range or not found")
-S(ChannelIndexOutOfRange, -1, "Allocating channel that is out of range")
-S(NotAllocated, -2, "Attempting to free unallocated resource")
-S(ResourceAlreadyAllocated, -3, "Attempted to reuse an allocated resource")
-S(NoAvailableResources, -4, "No available resources to allocate")
-S(NullParameter, -5, "A pointer parameter to a method is nullptr")
-S(Timeout, -6, "A timeout has been exceeded")
-S(CompassManufacturerError, -7, "Compass manufacturer doesn't match HiTechnic")
-S(CompassTypeError, -8,
-  "Compass type doesn't match expected type for HiTechnic compass")
-S(IncompatibleMode, -9, "The object is in an incompatible mode")
-S(AnalogTriggerLimitOrderError, -10,
-  "AnalogTrigger limits error.  Lower limit > Upper Limit")
-S(AnalogTriggerPulseOutputError, -11,
-  "Attempted to read AnalogTrigger pulse output.")
-S(TaskError, -12, "Task can't be started")
-S(TaskIDError, -13, "Task error: Invalid ID.")
-S(TaskDeletedError, -14, "Task error: Task already deleted.")
-S(TaskOptionsError, -15, "Task error: Invalid options.")
-S(TaskMemoryError, -16, "Task can't be started due to insufficient memory.")
-S(TaskPriorityError, -17, "Task error: Invalid priority [1-255].")
-S(DriveUninitialized, -18, "RobotDrive not initialized for the C interface")
-S(CompressorNonMatching, -19,
-  "Compressor slot/channel doesn't match previous instance")
-S(CompressorAlreadyDefined, -20, "Creating a second compressor instance")
-S(CompressorUndefined, -21,
-  "Using compressor functions without defining compressor")
-S(InconsistentArrayValueAdded, -22,
-  "When packing data into an array to the dashboard, not all values added were "
-  "of the same type.")
-S(MismatchedComplexTypeClose, -23,
-  "When packing data to the dashboard, a Close for a complex type was called "
-  "without a matching Open.")
-S(DashboardDataOverflow, -24,
-  "When packing data to the dashboard, too much data was packed and the buffer "
-  "overflowed.")
-S(DashboardDataCollision, -25,
-  "The same buffer was used for packing data and for printing.")
-S(EnhancedIOMissing, -26, "IO is not attached or Enhanced IO is not enabled.")
-S(LineNotOutput, -27,
-  "Cannot SetDigitalOutput for a line not configured for output.")
-S(ParameterOutOfRange, -28, "A parameter is out of range.")
-S(SPIClockRateTooLow, -29, "SPI clock rate was below the minimum supported")
-S(JaguarVersionError, -30, "Jaguar firmware version error")
-S(JaguarMessageNotFound, -31, "Jaguar message not found")
-S(NetworkTablesReadError, -40, "Error reading NetworkTables socket")
-S(NetworkTablesBufferFull, -41, "Buffer full writing to NetworkTables socket")
-S(NetworkTablesWrongType, -42,
-  "The wrong type was read from the NetworkTables entry")
-S(NetworkTablesCorrupt, -43, "NetworkTables data stream is corrupt")
-S(SmartDashboardMissingKey, -43, "SmartDashboard data does not exist")
-S(CommandIllegalUse, -50, "Illegal use of Command")
-S(UnsupportedInSimulation, -80, "Unsupported in simulation")
-S(CameraServerError, -90, "CameraServer error")
-S(InvalidParameter, -100, "Invalid parameter value")
-
-// Warnings
-S(SampleRateTooHigh, 1, "Analog module sample rate is too high")
-S(VoltageOutOfRange, 2,
-  "Voltage to convert to raw value is out of range [-10; 10]")
-S(CompressorTaskError, 3, "Compressor task won't start")
-S(LoopTimingError, 4, "Digital module loop timing is not the expected value")
-S(NonBinaryDigitalValue, 5, "Digital output value is not 0 or 1")
-S(IncorrectBatteryChannel, 6,
-  "Battery measurement channel is not correct value")
-S(BadJoystickIndex, 7, "Joystick index is out of range, should be 0-3")
-S(BadJoystickAxis, 8, "Joystick axis or POV is out of range")
-S(InvalidMotorIndex, 9, "Motor index is out of range, should be 0-3")
-S(DriverStationTaskError, 10, "Driver Station task won't start")
-S(EnhancedIOPWMPeriodOutOfRange, 11,
-  "Driver Station Enhanced IO PWM Output period out of range.")
-S(SPIWriteNoMOSI, 12, "Cannot write to SPI port with no MOSI output")
-S(SPIReadNoMISO, 13, "Cannot read from SPI port with no MISO input")
-S(SPIReadNoData, 14, "No data available to read from SPI")
-S(IncompatibleState, 15,
-  "Incompatible State: The operation cannot be completed")
-
-#undef S
diff --git a/wpilibc/src/main/native/include/frc/WPIErrors.mac b/wpilibc/src/main/native/include/frc/WPIErrors.mac
new file mode 100644
index 0000000..c6c96e9
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/WPIErrors.mac
@@ -0,0 +1,62 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+S(ModuleIndexOutOfRange, -1,
+  "Allocating module that is out of range or not found")
+S(ChannelIndexOutOfRange, -45, "Allocating channel that is out of range")
+S(NotAllocated, -2, "Attempting to free unallocated resource")
+S(ResourceAlreadyAllocated, -3, "Attempted to reuse an allocated resource")
+S(NoAvailableResources, -4, "No available resources to allocate")
+S(NullParameter, -5, "A pointer parameter to a method is nullptr")
+S(Timeout, -6, "A timeout has been exceeded")
+S(CompassManufacturerError, -7, "Compass manufacturer doesn't match HiTechnic")
+S(CompassTypeError, -8,
+  "Compass type doesn't match expected type for HiTechnic compass")
+S(IncompatibleMode, -9, "The object is in an incompatible mode")
+S(AnalogTriggerLimitOrderError, -10,
+  "AnalogTrigger limits error.  Lower limit > Upper Limit")
+S(AnalogTriggerPulseOutputError, -11,
+  "Attempted to read AnalogTrigger pulse output")
+S(TaskError, -12, "Task can't be started")
+S(TaskIDError, -13, "Task error: Invalid ID")
+S(TaskDeletedError, -14, "Task error: Task already deleted")
+S(TaskOptionsError, -15, "Task error: Invalid options")
+S(TaskMemoryError, -16, "Task can't be started due to insufficient memory")
+S(TaskPriorityError, -17, "Task error: Invalid priority [1-255]")
+S(DriveUninitialized, -18, "RobotDrive not initialized for the C interface")
+S(CompressorNonMatching, -19,
+  "Compressor slot/channel doesn't match previous instance")
+S(CompressorAlreadyDefined, -20, "Creating a second compressor instance")
+S(CompressorUndefined, -21,
+  "Using compressor functions without defining compressor")
+S(InconsistentArrayValueAdded, -22,
+  "When packing data into an array to the dashboard, not all values added were "
+  "of the same type")
+S(MismatchedComplexTypeClose, -23,
+  "When packing data to the dashboard, a Close for a complex type was called "
+  "without a matching Open")
+S(DashboardDataOverflow, -24,
+  "When packing data to the dashboard, too much data was packed and the buffer "
+  "overflowed")
+S(DashboardDataCollision, -25,
+  "The same buffer was used for packing data and for printing")
+S(EnhancedIOMissing, -26, "IO is not attached or Enhanced IO is not enabled")
+S(LineNotOutput, -27,
+  "Cannot SetDigitalOutput for a line not configured for output")
+S(ParameterOutOfRange, -28, "A parameter is out of range")
+S(SPIClockRateTooLow, -29, "SPI clock rate was below the minimum supported")
+S(JaguarVersionError, -30, "Jaguar firmware version error")
+S(JaguarMessageNotFound, -31, "Jaguar message not found")
+S(NetworkTablesReadError, -40, "Error reading NetworkTables socket")
+S(NetworkTablesBufferFull, -41, "Buffer full writing to NetworkTables socket")
+S(NetworkTablesWrongType, -42,
+  "The wrong type was read from the NetworkTables entry")
+S(NetworkTablesCorrupt, -43, "NetworkTables data stream is corrupt")
+S(SmartDashboardMissingKey, -44, "SmartDashboard data does not exist")
+S(CommandIllegalUse, -50, "Illegal use of Command")
+S(UnsupportedInSimulation, -80, "Unsupported in simulation")
+S(CameraServerError, -90, "CameraServer error")
+S(InvalidParameter, -100, "Invalid parameter value")
+S(AssertionFailure, -110, "Assertion failed")
+S(Error, -111, "Error")
diff --git a/wpilibc/src/main/native/include/frc/WPILib.h b/wpilibc/src/main/native/include/frc/WPILib.h
deleted file mode 100644
index 634d0f5..0000000
--- a/wpilibc/src/main/native/include/frc/WPILib.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-// clang-format off
-#ifdef _MSC_VER
-#pragma message("warning: Including this header drastically increases compilation times and is bad style. Include only what you use instead.")
-#else
-#warning "Including this header drastically increases compilation times and is bad style. Include only what you use instead."
-#endif
-
-// clang-format on
-
-#if __has_include(<cameraserver/CameraServer.h>)
-#include <cameraserver/CameraServer.h>
-#include <vision/VisionRunner.h>
-#endif
-
-#include "frc/ADXL345_I2C.h"
-#include "frc/ADXL345_SPI.h"
-#include "frc/ADXL362.h"
-#include "frc/ADXRS450_Gyro.h"
-#include "frc/AnalogAccelerometer.h"
-#include "frc/AnalogGyro.h"
-#include "frc/AnalogInput.h"
-#include "frc/AnalogOutput.h"
-#include "frc/AnalogPotentiometer.h"
-#include "frc/AnalogTrigger.h"
-#include "frc/AnalogTriggerOutput.h"
-#include "frc/BuiltInAccelerometer.h"
-#include "frc/Compressor.h"
-#include "frc/Counter.h"
-#include "frc/DMC60.h"
-#include "frc/DigitalInput.h"
-#include "frc/DigitalOutput.h"
-#include "frc/DigitalSource.h"
-#include "frc/DoubleSolenoid.h"
-#include "frc/DriverStation.h"
-#include "frc/Encoder.h"
-#include "frc/ErrorBase.h"
-#include "frc/GearTooth.h"
-#include "frc/GenericHID.h"
-#include "frc/I2C.h"
-#include "frc/InterruptableSensorBase.h"
-#include "frc/IterativeRobot.h"
-#include "frc/Jaguar.h"
-#include "frc/Joystick.h"
-#include "frc/NidecBrushless.h"
-#include "frc/Notifier.h"
-#include "frc/PIDController.h"
-#include "frc/PIDOutput.h"
-#include "frc/PIDSource.h"
-#include "frc/PWM.h"
-#include "frc/PWMSpeedController.h"
-#include "frc/PWMTalonSRX.h"
-#include "frc/PWMVictorSPX.h"
-#include "frc/PowerDistributionPanel.h"
-#include "frc/Preferences.h"
-#include "frc/Relay.h"
-#include "frc/RobotBase.h"
-#include "frc/RobotController.h"
-#include "frc/RobotDrive.h"
-#include "frc/SD540.h"
-#include "frc/SPI.h"
-#include "frc/SensorUtil.h"
-#include "frc/SerialPort.h"
-#include "frc/Servo.h"
-#include "frc/Solenoid.h"
-#include "frc/Spark.h"
-#include "frc/SpeedController.h"
-#include "frc/SpeedControllerGroup.h"
-#include "frc/Talon.h"
-#include "frc/Threads.h"
-#include "frc/TimedRobot.h"
-#include "frc/Timer.h"
-#include "frc/Ultrasonic.h"
-#include "frc/Utility.h"
-#include "frc/Victor.h"
-#include "frc/VictorSP.h"
-#include "frc/WPIErrors.h"
-#include "frc/XboxController.h"
-#if __has_include("frc/buttons/InternalButton.h")
-#include "frc/buttons/InternalButton.h"
-#include "frc/buttons/JoystickButton.h"
-#include "frc/buttons/NetworkButton.h"
-#include "frc/commands/Command.h"
-#include "frc/commands/CommandGroup.h"
-#include "frc/commands/PIDCommand.h"
-#include "frc/commands/PIDSubsystem.h"
-#include "frc/commands/PrintCommand.h"
-#include "frc/commands/StartCommand.h"
-#include "frc/commands/Subsystem.h"
-#include "frc/commands/WaitCommand.h"
-#include "frc/commands/WaitForChildren.h"
-#include "frc/commands/WaitUntilCommand.h"
-#endif
-#include "frc/drive/DifferentialDrive.h"
-#include "frc/drive/KilloughDrive.h"
-#include "frc/drive/MecanumDrive.h"
-#include "frc/filters/LinearDigitalFilter.h"
-#include "frc/interfaces/Accelerometer.h"
-#include "frc/interfaces/Gyro.h"
-#include "frc/interfaces/Potentiometer.h"
-#include "frc/smartdashboard/SendableChooser.h"
-#include "frc/smartdashboard/SmartDashboard.h"
diff --git a/wpilibc/src/main/native/include/frc/WPIWarnings.mac b/wpilibc/src/main/native/include/frc/WPIWarnings.mac
new file mode 100644
index 0000000..fa63494
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/WPIWarnings.mac
@@ -0,0 +1,24 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+S(SampleRateTooHigh, 1, "Analog module sample rate is too high")
+S(VoltageOutOfRange, 2,
+  "Voltage to convert to raw value is out of range [-10; 10]")
+S(CompressorTaskError, 3, "Compressor task won't start")
+S(LoopTimingError, 4, "Digital module loop timing is not the expected value")
+S(NonBinaryDigitalValue, 5, "Digital output value is not 0 or 1")
+S(IncorrectBatteryChannel, 6,
+  "Battery measurement channel is not correct value")
+S(BadJoystickIndex, 7, "Joystick index is out of range, should be 0-3")
+S(BadJoystickAxis, 8, "Joystick axis or POV is out of range")
+S(InvalidMotorIndex, 9, "Motor index is out of range, should be 0-3")
+S(DriverStationTaskError, 10, "Driver Station task won't start")
+S(EnhancedIOPWMPeriodOutOfRange, 11,
+  "Driver Station Enhanced IO PWM Output period out of range")
+S(SPIWriteNoMOSI, 12, "Cannot write to SPI port with no MOSI output")
+S(SPIReadNoMISO, 13, "Cannot read from SPI port with no MISO input")
+S(SPIReadNoData, 14, "No data available to read from SPI")
+S(IncompatibleState, 15,
+  "Incompatible State: The operation cannot be completed")
+S(Warning, 16, "Warning")
diff --git a/wpilibc/src/main/native/include/frc/Watchdog.h b/wpilibc/src/main/native/include/frc/Watchdog.h
index 6fc3793..d85674d 100644
--- a/wpilibc/src/main/native/include/frc/Watchdog.h
+++ b/wpilibc/src/main/native/include/frc/Watchdog.h
@@ -1,18 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
+#include <string_view>
 #include <utility>
 
 #include <units/time.h>
-#include <wpi/StringRef.h>
-#include <wpi/deprecated.h>
 
 #include "frc/Tracer.h"
 
@@ -32,19 +28,6 @@
   /**
    * Watchdog constructor.
    *
-   * @deprecated use unit-safe version instead.
-   * Watchdog(units::second_t timeout, std::function<void()> callback)
-   *
-   * @param timeout  The watchdog's timeout in seconds with microsecond
-   *                 resolution.
-   * @param callback This function is called when the timeout expires.
-   */
-  WPI_DEPRECATED("Use unit-safe version instead")
-  Watchdog(double timeout, std::function<void()> callback);
-
-  /**
-   * Watchdog constructor.
-   *
    * @param timeout  The watchdog's timeout in seconds with microsecond
    *                 resolution.
    * @param callback This function is called when the timeout expires.
@@ -52,11 +35,6 @@
   Watchdog(units::second_t timeout, std::function<void()> callback);
 
   template <typename Callable, typename Arg, typename... Args>
-  WPI_DEPRECATED("Use unit-safe version instead")
-  Watchdog(double timeout, Callable&& f, Arg&& arg, Args&&... args)
-      : Watchdog(units::second_t{timeout}, arg, args...) {}
-
-  template <typename Callable, typename Arg, typename... Args>
   Watchdog(units::second_t timeout, Callable&& f, Arg&& arg, Args&&... args)
       : Watchdog(timeout,
                  std::bind(std::forward<Callable>(f), std::forward<Arg>(arg),
@@ -68,21 +46,9 @@
   Watchdog& operator=(Watchdog&& rhs);
 
   /**
-   * Returns the time in seconds since the watchdog was last fed.
+   * Returns the time since the watchdog was last fed.
    */
-  double GetTime() const;
-
-  /**
-   * Sets the watchdog's timeout.
-   *
-   * @deprecated use the unit safe version instead.
-   * SetTimeout(units::second_t timeout)
-   *
-   * @param timeout The watchdog's timeout in seconds with microsecond
-   *                resolution.
-   */
-  WPI_DEPRECATED("Use unit-safe version instead")
-  void SetTimeout(double timeout);
+  units::second_t GetTime() const;
 
   /**
    * Sets the watchdog's timeout.
@@ -93,9 +59,9 @@
   void SetTimeout(units::second_t timeout);
 
   /**
-   * Returns the watchdog's timeout in seconds.
+   * Returns the watchdog's timeout.
    */
-  double GetTimeout() const;
+  units::second_t GetTimeout() const;
 
   /**
    * Returns true if the watchdog timer has expired.
@@ -110,7 +76,7 @@
    *
    * @param epochName The name to associate with the epoch.
    */
-  void AddEpoch(wpi::StringRef epochName);
+  void AddEpoch(std::string_view epochName);
 
   /**
    * Prints list of epochs added so far and their times.
@@ -146,7 +112,7 @@
 
  private:
   // Used for timeout print rate-limiting
-  static constexpr units::second_t kMinPrintPeriod = 1_s;
+  static constexpr auto kMinPrintPeriod = 1_s;
 
   units::second_t m_startTime = 0_s;
   units::second_t m_timeout;
diff --git a/wpilibc/src/main/native/include/frc/XboxController.h b/wpilibc/src/main/native/include/frc/XboxController.h
index ddf4dc2..cbdc7d7 100644
--- a/wpilibc/src/main/native/include/frc/XboxController.h
+++ b/wpilibc/src/main/native/include/frc/XboxController.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -32,78 +29,102 @@
    */
   explicit XboxController(int port);
 
-  virtual ~XboxController() = default;
+  ~XboxController() override = default;
 
   XboxController(XboxController&&) = default;
   XboxController& operator=(XboxController&&) = default;
 
   /**
-   * Get the X axis value of the controller.
-   *
-   * @param hand Side of controller whose value should be returned.
+   * Get the X axis value of left side of the controller.
    */
-  double GetX(JoystickHand hand) const override;
+  double GetLeftX() const;
 
   /**
-   * Get the Y axis value of the controller.
-   *
-   * @param hand Side of controller whose value should be returned.
+   * Get the X axis value of right side of the controller.
    */
-  double GetY(JoystickHand hand) const override;
+  double GetRightX() const;
 
   /**
-   * Get the trigger axis value of the controller.
-   *
-   * @param hand Side of controller whose value should be returned.
+   * Get the Y axis value of left side of the controller.
    */
-  double GetTriggerAxis(JoystickHand hand) const;
+  double GetLeftY() const;
 
   /**
-   * Read the value of the bumper button on the controller.
-   *
-   * @param hand Side of controller whose value should be returned.
+   * Get the Y axis value of right side of the controller.
    */
-  bool GetBumper(JoystickHand hand) const;
+  double GetRightY() const;
 
   /**
-   * Whether the bumper was pressed since the last check.
-   *
-   * @param hand Side of controller whose value should be returned.
-   * @return Whether the button was pressed since the last check.
+   * Get the left trigger (LT) axis value of the controller. Note that this axis
+   * is bound to the range of [0, 1] as opposed to the usual [-1, 1].
    */
-  bool GetBumperPressed(JoystickHand hand);
+  double GetLeftTriggerAxis() const;
 
   /**
-   * Whether the bumper was released since the last check.
-   *
-   * @param hand Side of controller whose value should be returned.
-   * @return Whether the button was released since the last check.
+   * Get the right trigger (RT) axis value of the controller. Note that this
+   * axis is bound to the range of [0, 1] as opposed to the usual [-1, 1].
    */
-  bool GetBumperReleased(JoystickHand hand);
+  double GetRightTriggerAxis() const;
 
   /**
-   * Read the value of the stick button on the controller.
-   *
-   * @param hand Side of controller whose value should be returned.
-   * @return The state of the button.
+   * Read the value of the left bumper (LB) button on the controller.
    */
-  bool GetStickButton(JoystickHand hand) const;
+  bool GetLeftBumper() const;
 
   /**
-   * Whether the stick button was pressed since the last check.
-   *
-   * @param hand Side of controller whose value should be returned.
-   * @return Whether the button was pressed since the last check.
+   * Read the value of the right bumper (RB) button on the controller.
    */
-  bool GetStickButtonPressed(JoystickHand hand);
+  bool GetRightBumper() const;
 
   /**
-   * Whether the stick button was released since the last check.
-   *
-   * @param hand Side of controller whose value should be returned.
-   * @return Whether the button was released since the last check.
+   * Whether the left bumper (LB) was pressed since the last check.
    */
-  bool GetStickButtonReleased(JoystickHand hand);
+  bool GetLeftBumperPressed();
+
+  /**
+   * Whether the right bumper (RB) was pressed since the last check.
+   */
+  bool GetRightBumperPressed();
+
+  /**
+   * Whether the left bumper (LB) was released since the last check.
+   */
+  bool GetLeftBumperReleased();
+
+  /**
+   * Whether the right bumper (RB) was released since the last check.
+   */
+  bool GetRightBumperReleased();
+
+  /**
+   * Read the value of the left stick button (LSB) on the controller.
+   */
+  bool GetLeftStickButton() const;
+
+  /**
+   * Read the value of the right stick button (RSB) on the controller.
+   */
+  bool GetRightStickButton() const;
+
+  /**
+   * Whether the left stick button (LSB) was pressed since the last check.
+   */
+  bool GetLeftStickButtonPressed();
+
+  /**
+   * Whether the right stick button (RSB) was pressed since the last check.
+   */
+  bool GetRightStickButtonPressed();
+
+  /**
+   * Whether the left stick button (LSB) was released since the last check.
+   */
+  bool GetLeftStickButtonReleased();
+
+  /**
+   * Whether the right stick button (RSB) was released since the last check.
+   */
+  bool GetRightStickButtonReleased();
 
   /**
    * Read the value of the A button on the controller.
@@ -213,7 +234,6 @@
   /**
    * Read the value of the start button on the controller.
    *
-   * @param hand Side of controller whose value should be returned.
    * @return The state of the button.
    */
   bool GetStartButton() const;
@@ -232,26 +252,26 @@
    */
   bool GetStartButtonReleased();
 
-  enum class Button {
-    kBumperLeft = 5,
-    kBumperRight = 6,
-    kStickLeft = 9,
-    kStickRight = 10,
-    kA = 1,
-    kB = 2,
-    kX = 3,
-    kY = 4,
-    kBack = 7,
-    kStart = 8
+  struct Button {
+    static constexpr int kLeftBumper = 5;
+    static constexpr int kRightBumper = 6;
+    static constexpr int kLeftStick = 9;
+    static constexpr int kRightStick = 10;
+    static constexpr int kA = 1;
+    static constexpr int kB = 2;
+    static constexpr int kX = 3;
+    static constexpr int kY = 4;
+    static constexpr int kBack = 7;
+    static constexpr int kStart = 8;
   };
 
-  enum class Axis {
-    kLeftX = 0,
-    kRightX = 4,
-    kLeftY = 1,
-    kRightY = 5,
-    kLeftTrigger = 2,
-    kRightTrigger = 3
+  struct Axis {
+    static constexpr int kLeftX = 0;
+    static constexpr int kRightX = 4;
+    static constexpr int kLeftY = 1;
+    static constexpr int kRightY = 5;
+    static constexpr int kLeftTrigger = 2;
+    static constexpr int kRightTrigger = 3;
   };
 };
 
diff --git a/wpilibc/src/main/native/include/frc/controller/ControllerUtil.h b/wpilibc/src/main/native/include/frc/controller/ControllerUtil.h
deleted file mode 100644
index 7603fde..0000000
--- a/wpilibc/src/main/native/include/frc/controller/ControllerUtil.h
+++ /dev/null
@@ -1,42 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <cmath>
-#include <type_traits>
-
-#include <units/math.h>
-
-namespace frc {
-
-/**
- * Returns modulus of error where error is the difference between the reference
- * and a measurement.
- *
- * @param reference Reference input of a controller.
- * @param measurement The current measurement.
- * @param minimumInput The minimum value expected from the input.
- * @param maximumInput The maximum value expected from the input.
- */
-template <typename T>
-T GetModulusError(T reference, T measurement, T minimumInput, T maximumInput) {
-  T error = reference - measurement;
-  T modulus = maximumInput - minimumInput;
-
-  // Wrap error above maximum input
-  int numMax = (error + maximumInput) / modulus;
-  error -= numMax * modulus;
-
-  // Wrap error below minimum input
-  int numMin = (error + minimumInput) / modulus;
-  error -= numMin * modulus;
-
-  return error;
-}
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/controller/HolonomicDriveController.h b/wpilibc/src/main/native/include/frc/controller/HolonomicDriveController.h
deleted file mode 100644
index 916e1a9..0000000
--- a/wpilibc/src/main/native/include/frc/controller/HolonomicDriveController.h
+++ /dev/null
@@ -1,112 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <units/angle.h>
-#include <units/velocity.h>
-
-#include "frc/controller/PIDController.h"
-#include "frc/controller/ProfiledPIDController.h"
-#include "frc/geometry/Pose2d.h"
-#include "frc/geometry/Rotation2d.h"
-#include "frc/kinematics/ChassisSpeeds.h"
-#include "frc/trajectory/Trajectory.h"
-
-namespace frc {
-/**
- * This holonomic drive controller can be used to follow trajectories using a
- * holonomic drive train (i.e. swerve or mecanum). Holonomic trajectory
- * following is a much simpler problem to solve compared to skid-steer style
- * drivetrains because it is possible to individually control forward, sideways,
- * and angular velocity.
- *
- * The holonomic drive controller takes in one PID controller for each
- * direction, forward and sideways, and one profiled PID controller for the
- * angular direction. Because the heading dynamics are decoupled from
- * translations, users can specify a custom heading that the drivetrain should
- * point toward. This heading reference is profiled for smoothness.
- */
-class HolonomicDriveController {
- public:
-  /**
-   * Constructs a holonomic drive controller.
-   *
-   * @param xController     A PID Controller to respond to error in the
-   * field-relative x direction.
-   * @param yController     A PID Controller to respond to error in the
-   * field-relative y direction.
-   * @param thetaController A profiled PID controller to respond to error in
-   * angle.
-   */
-  HolonomicDriveController(
-      const frc2::PIDController& xController,
-      const frc2::PIDController& yController,
-      const ProfiledPIDController<units::radian>& thetaController);
-
-  /**
-   * Returns true if the pose error is within tolerance of the reference.
-   */
-  bool AtReference() const;
-
-  /**
-   * Sets the pose error which is considered tolerable for use with
-   * AtReference().
-   *
-   * @param poseTolerance Pose error which is tolerable.
-   */
-  void SetTolerance(const Pose2d& tolerance);
-
-  /**
-   * Returns the next output of the holonomic drive controller.
-   *
-   * The reference pose, linear velocity, and angular velocity should come from
-   * a drivetrain trajectory.
-   *
-   * @param currentPose        The current pose.
-   * @param poseRef            The desired pose.
-   * @param linearVelocityRef  The desired linear velocity.
-   * @param angleRef           The desired ending angle.
-   */
-  ChassisSpeeds Calculate(const Pose2d& currentPose, const Pose2d& poseRef,
-                          units::meters_per_second_t linearVelocityRef,
-                          const Rotation2d& angleRef);
-
-  /**
-   * Returns the next output of the holonomic drive controller.
-   *
-   * The reference pose, linear velocity, and angular velocity should come from
-   * a drivetrain trajectory.
-   *
-   * @param currentPose  The current pose.
-   * @param desiredState The desired pose, linear velocity, and angular velocity
-   *                     from a trajectory.
-   * @param angleRef     The desired ending angle.
-   */
-  ChassisSpeeds Calculate(const Pose2d& currentPose,
-                          const Trajectory::State& desiredState,
-                          const Rotation2d& angleRef);
-
-  /**
-   * Enables and disables the controller for troubleshooting purposes. When
-   * Calculate() is called on a disabled controller, only feedforward values
-   * are returned.
-   *
-   * @param enabled If the controller is enabled or not.
-   */
-  void SetEnabled(bool enabled);
-
- private:
-  Pose2d m_poseError;
-  Pose2d m_poseTolerance;
-  bool m_enabled = true;
-
-  frc2::PIDController m_xController;
-  frc2::PIDController m_yController;
-  ProfiledPIDController<units::radian> m_thetaController;
-};
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/controller/PIDController.h b/wpilibc/src/main/native/include/frc/controller/PIDController.h
deleted file mode 100644
index 5f97c1e..0000000
--- a/wpilibc/src/main/native/include/frc/controller/PIDController.h
+++ /dev/null
@@ -1,243 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <functional>
-#include <limits>
-
-#include <units/time.h>
-
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
-
-namespace frc2 {
-
-/**
- * Implements a PID control loop.
- */
-class PIDController : public frc::Sendable,
-                      public frc::SendableHelper<PIDController> {
- public:
-  /**
-   * Allocates a PIDController with the given constants for Kp, Ki, and Kd.
-   *
-   * @param Kp     The proportional coefficient.
-   * @param Ki     The integral coefficient.
-   * @param Kd     The derivative coefficient.
-   * @param period The period between controller updates in seconds. The
-   *               default is 20 milliseconds.
-   */
-  PIDController(double Kp, double Ki, double Kd,
-                units::second_t period = 20_ms);
-
-  ~PIDController() override = default;
-
-  PIDController(const PIDController&) = default;
-  PIDController& operator=(const PIDController&) = default;
-  PIDController(PIDController&&) = default;
-  PIDController& operator=(PIDController&&) = default;
-
-  /**
-   * Sets the PID Controller gain parameters.
-   *
-   * Sets the proportional, integral, and differential coefficients.
-   *
-   * @param Kp Proportional coefficient
-   * @param Ki Integral coefficient
-   * @param Kd Differential coefficient
-   */
-  void SetPID(double Kp, double Ki, double Kd);
-
-  /**
-   * Sets the proportional coefficient of the PID controller gain.
-   *
-   * @param Kp proportional coefficient
-   */
-  void SetP(double Kp);
-
-  /**
-   * Sets the integral coefficient of the PID controller gain.
-   *
-   * @param Ki integral coefficient
-   */
-  void SetI(double Ki);
-
-  /**
-   * Sets the differential coefficient of the PID controller gain.
-   *
-   * @param Kd differential coefficient
-   */
-  void SetD(double Kd);
-
-  /**
-   * Gets the proportional coefficient.
-   *
-   * @return proportional coefficient
-   */
-  double GetP() const;
-
-  /**
-   * Gets the integral coefficient.
-   *
-   * @return integral coefficient
-   */
-  double GetI() const;
-
-  /**
-   * Gets the differential coefficient.
-   *
-   * @return differential coefficient
-   */
-  double GetD() const;
-
-  /**
-   * Gets the period of this controller.
-   *
-   * @return The period of the controller.
-   */
-  units::second_t GetPeriod() const;
-
-  /**
-   * Sets the setpoint for the PIDController.
-   *
-   * @param setpoint The desired setpoint.
-   */
-  void SetSetpoint(double setpoint);
-
-  /**
-   * Returns the current setpoint of the PIDController.
-   *
-   * @return The current setpoint.
-   */
-  double GetSetpoint() const;
-
-  /**
-   * Returns true if the error is within the tolerance of the setpoint.
-   *
-   * This will return false until at least one input value has been computed.
-   */
-  bool AtSetpoint() const;
-
-  /**
-   * Enables continuous input.
-   *
-   * Rather then using the max and min input range as constraints, it considers
-   * them to be the same point and automatically calculates the shortest route
-   * to the setpoint.
-   *
-   * @param minimumInput The minimum value expected from the input.
-   * @param maximumInput The maximum value expected from the input.
-   */
-  void EnableContinuousInput(double minimumInput, double maximumInput);
-
-  /**
-   * Disables continuous input.
-   */
-  void DisableContinuousInput();
-
-  /**
-   * Returns true if continuous input is enabled.
-   */
-  bool IsContinuousInputEnabled() const;
-
-  /**
-   * Sets the minimum and maximum values for the integrator.
-   *
-   * When the cap is reached, the integrator value is added to the controller
-   * output rather than the integrator value times the integral gain.
-   *
-   * @param minimumIntegral The minimum value of the integrator.
-   * @param maximumIntegral The maximum value of the integrator.
-   */
-  void SetIntegratorRange(double minimumIntegral, double maximumIntegral);
-
-  /**
-   * Sets the error which is considered tolerable for use with AtSetpoint().
-   *
-   * @param positionTolerance Position error which is tolerable.
-   * @param velociytTolerance Velocity error which is tolerable.
-   */
-  void SetTolerance(
-      double positionTolerance,
-      double velocityTolerance = std::numeric_limits<double>::infinity());
-
-  /**
-   * Returns the difference between the setpoint and the measurement.
-   */
-  double GetPositionError() const;
-
-  /**
-   * Returns the velocity error.
-   */
-  double GetVelocityError() const;
-
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   */
-  double Calculate(double measurement);
-
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   * @param setpoint The new setpoint of the controller.
-   */
-  double Calculate(double measurement, double setpoint);
-
-  /**
-   * Reset the previous error, the integral term, and disable the controller.
-   */
-  void Reset();
-
-  void InitSendable(frc::SendableBuilder& builder) override;
-
- private:
-  // Factor for "proportional" control
-  double m_Kp;
-
-  // Factor for "integral" control
-  double m_Ki;
-
-  // Factor for "derivative" control
-  double m_Kd;
-
-  // The period (in seconds) of the control loop running this controller
-  units::second_t m_period;
-
-  double m_maximumIntegral = 1.0;
-
-  double m_minimumIntegral = -1.0;
-
-  double m_maximumInput = 0;
-
-  double m_minimumInput = 0;
-
-  // Do the endpoints wrap around? eg. Absolute encoder
-  bool m_continuous = false;
-
-  // The error at the time of the most recent call to Calculate()
-  double m_positionError = 0;
-  double m_velocityError = 0;
-
-  // The error at the time of the second-most-recent call to Calculate() (used
-  // to compute velocity)
-  double m_prevError = 0;
-
-  // The sum of the errors for use in the integral calc
-  double m_totalError = 0;
-
-  // The error that is considered at setpoint.
-  double m_positionTolerance = 0.05;
-  double m_velocityTolerance = std::numeric_limits<double>::infinity();
-
-  double m_setpoint = 0;
-};
-
-}  // namespace frc2
diff --git a/wpilibc/src/main/native/include/frc/controller/ProfiledPIDController.h b/wpilibc/src/main/native/include/frc/controller/ProfiledPIDController.h
deleted file mode 100644
index fd246cd..0000000
--- a/wpilibc/src/main/native/include/frc/controller/ProfiledPIDController.h
+++ /dev/null
@@ -1,367 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <algorithm>
-#include <cmath>
-#include <functional>
-#include <limits>
-
-#include <units/time.h>
-
-#include "frc/controller/ControllerUtil.h"
-#include "frc/controller/PIDController.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableHelper.h"
-#include "frc/trajectory/TrapezoidProfile.h"
-
-namespace frc {
-namespace detail {
-void ReportProfiledPIDController();
-}  // namespace detail
-
-/**
- * Implements a PID control loop whose setpoint is constrained by a trapezoid
- * profile.
- */
-template <class Distance>
-class ProfiledPIDController
-    : public Sendable,
-      public SendableHelper<ProfiledPIDController<Distance>> {
- public:
-  using Distance_t = units::unit_t<Distance>;
-  using Velocity =
-      units::compound_unit<Distance, units::inverse<units::seconds>>;
-  using Velocity_t = units::unit_t<Velocity>;
-  using Acceleration =
-      units::compound_unit<Velocity, units::inverse<units::seconds>>;
-  using Acceleration_t = units::unit_t<Acceleration>;
-  using State = typename TrapezoidProfile<Distance>::State;
-  using Constraints = typename TrapezoidProfile<Distance>::Constraints;
-
-  /**
-   * Allocates a ProfiledPIDController with the given constants for Kp, Ki, and
-   * Kd. Users should call reset() when they first start running the controller
-   * to avoid unwanted behavior.
-   *
-   * @param Kp          The proportional coefficient.
-   * @param Ki          The integral coefficient.
-   * @param Kd          The derivative coefficient.
-   * @param constraints Velocity and acceleration constraints for goal.
-   * @param period      The period between controller updates in seconds. The
-   *                    default is 20 milliseconds.
-   */
-  ProfiledPIDController(double Kp, double Ki, double Kd,
-                        Constraints constraints, units::second_t period = 20_ms)
-      : m_controller(Kp, Ki, Kd, period), m_constraints(constraints) {
-    detail::ReportProfiledPIDController();
-  }
-
-  ~ProfiledPIDController() override = default;
-
-  ProfiledPIDController(const ProfiledPIDController&) = default;
-  ProfiledPIDController& operator=(const ProfiledPIDController&) = default;
-  ProfiledPIDController(ProfiledPIDController&&) = default;
-  ProfiledPIDController& operator=(ProfiledPIDController&&) = default;
-
-  /**
-   * Sets the PID Controller gain parameters.
-   *
-   * Sets the proportional, integral, and differential coefficients.
-   *
-   * @param Kp Proportional coefficient
-   * @param Ki Integral coefficient
-   * @param Kd Differential coefficient
-   */
-  void SetPID(double Kp, double Ki, double Kd) {
-    m_controller.SetPID(Kp, Ki, Kd);
-  }
-
-  /**
-   * Sets the proportional coefficient of the PID controller gain.
-   *
-   * @param Kp proportional coefficient
-   */
-  void SetP(double Kp) { m_controller.SetP(Kp); }
-
-  /**
-   * Sets the integral coefficient of the PID controller gain.
-   *
-   * @param Ki integral coefficient
-   */
-  void SetI(double Ki) { m_controller.SetI(Ki); }
-
-  /**
-   * Sets the differential coefficient of the PID controller gain.
-   *
-   * @param Kd differential coefficient
-   */
-  void SetD(double Kd) { m_controller.SetD(Kd); }
-
-  /**
-   * Gets the proportional coefficient.
-   *
-   * @return proportional coefficient
-   */
-  double GetP() const { return m_controller.GetP(); }
-
-  /**
-   * Gets the integral coefficient.
-   *
-   * @return integral coefficient
-   */
-  double GetI() const { return m_controller.GetI(); }
-
-  /**
-   * Gets the differential coefficient.
-   *
-   * @return differential coefficient
-   */
-  double GetD() const { return m_controller.GetD(); }
-
-  /**
-   * Gets the period of this controller.
-   *
-   * @return The period of the controller.
-   */
-  units::second_t GetPeriod() const { return m_controller.GetPeriod(); }
-
-  /**
-   * Sets the goal for the ProfiledPIDController.
-   *
-   * @param goal The desired unprofiled setpoint.
-   */
-  void SetGoal(State goal) { m_goal = goal; }
-
-  /**
-   * Sets the goal for the ProfiledPIDController.
-   *
-   * @param goal The desired unprofiled setpoint.
-   */
-  void SetGoal(Distance_t goal) { m_goal = {goal, Velocity_t(0)}; }
-
-  /**
-   * Gets the goal for the ProfiledPIDController.
-   */
-  State GetGoal() const { return m_goal; }
-
-  /**
-   * Returns true if the error is within the tolerance of the error.
-   *
-   * This will return false until at least one input value has been computed.
-   */
-  bool AtGoal() const { return AtSetpoint() && m_goal == m_setpoint; }
-
-  /**
-   * Set velocity and acceleration constraints for goal.
-   *
-   * @param constraints Velocity and acceleration constraints for goal.
-   */
-  void SetConstraints(Constraints constraints) { m_constraints = constraints; }
-
-  /**
-   * Returns the current setpoint of the ProfiledPIDController.
-   *
-   * @return The current setpoint.
-   */
-  State GetSetpoint() const { return m_setpoint; }
-
-  /**
-   * Returns true if the error is within the tolerance of the error.
-   *
-   * Currently this just reports on target as the actual value passes through
-   * the setpoint. Ideally it should be based on being within the tolerance for
-   * some period of time.
-   *
-   * This will return false until at least one input value has been computed.
-   */
-  bool AtSetpoint() const { return m_controller.AtSetpoint(); }
-
-  /**
-   * Enables continuous input.
-   *
-   * Rather then using the max and min input range as constraints, it considers
-   * them to be the same point and automatically calculates the shortest route
-   * to the setpoint.
-   *
-   * @param minimumInput The minimum value expected from the input.
-   * @param maximumInput The maximum value expected from the input.
-   */
-  void EnableContinuousInput(Distance_t minimumInput, Distance_t maximumInput) {
-    m_controller.EnableContinuousInput(minimumInput.template to<double>(),
-                                       maximumInput.template to<double>());
-    m_minimumInput = minimumInput;
-    m_maximumInput = maximumInput;
-  }
-
-  /**
-   * Disables continuous input.
-   */
-  void DisableContinuousInput() { m_controller.DisableContinuousInput(); }
-
-  /**
-   * Sets the minimum and maximum values for the integrator.
-   *
-   * When the cap is reached, the integrator value is added to the controller
-   * output rather than the integrator value times the integral gain.
-   *
-   * @param minimumIntegral The minimum value of the integrator.
-   * @param maximumIntegral The maximum value of the integrator.
-   */
-  void SetIntegratorRange(double minimumIntegral, double maximumIntegral) {
-    m_controller.SetIntegratorRange(minimumIntegral, maximumIntegral);
-  }
-
-  /**
-   * Sets the error which is considered tolerable for use with
-   * AtSetpoint().
-   *
-   * @param positionTolerance Position error which is tolerable.
-   * @param velocityTolerance Velocity error which is tolerable.
-   */
-  void SetTolerance(
-      Distance_t positionTolerance,
-      Velocity_t velocityTolerance = std::numeric_limits<double>::infinity()) {
-    m_controller.SetTolerance(positionTolerance.template to<double>(),
-                              velocityTolerance.template to<double>());
-  }
-
-  /**
-   * Returns the difference between the setpoint and the measurement.
-   *
-   * @return The error.
-   */
-  Distance_t GetPositionError() const {
-    return Distance_t(m_controller.GetPositionError());
-  }
-
-  /**
-   * Returns the change in error per second.
-   */
-  Velocity_t GetVelocityError() const {
-    return Velocity_t(m_controller.GetVelocityError());
-  }
-
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   */
-  double Calculate(Distance_t measurement) {
-    if (m_controller.IsContinuousInputEnabled()) {
-      // Get error which is smallest distance between goal and measurement
-      auto goalMinDistance = frc::GetModulusError<Distance_t>(
-          m_goal.position, measurement, m_minimumInput, m_maximumInput);
-      auto setpointMinDistance = frc::GetModulusError<Distance_t>(
-          m_setpoint.position, measurement, m_minimumInput, m_maximumInput);
-
-      // Recompute the profile goal with the smallest error, thus giving the
-      // shortest path. The goal may be outside the input range after this
-      // operation, but that's OK because the controller will still go there and
-      // report an error of zero. In other words, the setpoint only needs to be
-      // offset from the measurement by the input range modulus; they don't need
-      // to be equal.
-      m_goal.position = goalMinDistance + measurement;
-      m_setpoint.position = setpointMinDistance + measurement;
-    }
-
-    frc::TrapezoidProfile<Distance> profile{m_constraints, m_goal, m_setpoint};
-    m_setpoint = profile.Calculate(GetPeriod());
-    return m_controller.Calculate(measurement.template to<double>(),
-                                  m_setpoint.position.template to<double>());
-  }
-
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   * @param goal The new goal of the controller.
-   */
-  double Calculate(Distance_t measurement, State goal) {
-    SetGoal(goal);
-    return Calculate(measurement);
-  }
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   * @param goal The new goal of the controller.
-   */
-  double Calculate(Distance_t measurement, Distance_t goal) {
-    SetGoal(goal);
-    return Calculate(measurement);
-  }
-
-  /**
-   * Returns the next output of the PID controller.
-   *
-   * @param measurement The current measurement of the process variable.
-   * @param goal        The new goal of the controller.
-   * @param constraints Velocity and acceleration constraints for goal.
-   */
-  double Calculate(
-      Distance_t measurement, Distance_t goal,
-      typename frc::TrapezoidProfile<Distance>::Constraints constraints) {
-    SetConstraints(constraints);
-    return Calculate(measurement, goal);
-  }
-
-  /**
-   * Reset the previous error and the integral term.
-   *
-   * @param measurement The current measured State of the system.
-   */
-  void Reset(const State& measurement) {
-    m_controller.Reset();
-    m_setpoint = measurement;
-  }
-
-  /**
-   * Reset the previous error and the integral term.
-   *
-   * @param measuredPosition The current measured position of the system.
-   * @param measuredVelocity The current measured velocity of the system.
-   */
-  void Reset(Distance_t measuredPosition, Velocity_t measuredVelocity) {
-    Reset(State{measuredPosition, measuredVelocity});
-  }
-
-  /**
-   * Reset the previous error and the integral term.
-   *
-   * @param measuredPosition The current measured position of the system. The
-   * velocity is assumed to be zero.
-   */
-  void Reset(Distance_t measuredPosition) {
-    Reset(measuredPosition, Velocity_t(0));
-  }
-
-  void InitSendable(frc::SendableBuilder& builder) override {
-    builder.SetSmartDashboardType("ProfiledPIDController");
-    builder.AddDoubleProperty(
-        "p", [this] { return GetP(); }, [this](double value) { SetP(value); });
-    builder.AddDoubleProperty(
-        "i", [this] { return GetI(); }, [this](double value) { SetI(value); });
-    builder.AddDoubleProperty(
-        "d", [this] { return GetD(); }, [this](double value) { SetD(value); });
-    builder.AddDoubleProperty(
-        "goal", [this] { return GetGoal().position.template to<double>(); },
-        [this](double value) { SetGoal(Distance_t{value}); });
-  }
-
- private:
-  frc2::PIDController m_controller;
-  Distance_t m_minimumInput{0};
-  Distance_t m_maximumInput{0};
-  typename frc::TrapezoidProfile<Distance>::State m_goal;
-  typename frc::TrapezoidProfile<Distance>::State m_setpoint;
-  typename frc::TrapezoidProfile<Distance>::Constraints m_constraints;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/controller/RamseteController.h b/wpilibc/src/main/native/include/frc/controller/RamseteController.h
deleted file mode 100644
index e746bb3..0000000
--- a/wpilibc/src/main/native/include/frc/controller/RamseteController.h
+++ /dev/null
@@ -1,122 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <units/angular_velocity.h>
-#include <units/velocity.h>
-
-#include "frc/geometry/Pose2d.h"
-#include "frc/kinematics/ChassisSpeeds.h"
-#include "frc/trajectory/Trajectory.h"
-
-namespace frc {
-
-/**
- * Ramsete is a nonlinear time-varying feedback controller for unicycle models
- * that drives the model to a desired pose along a two-dimensional trajectory.
- * Why would we need a nonlinear control law in addition to the linear ones we
- * have used so far like PID? If we use the original approach with PID
- * controllers for left and right position and velocity states, the controllers
- * only deal with the local pose. If the robot deviates from the path, there is
- * no way for the controllers to correct and the robot may not reach the desired
- * global pose. This is due to multiple endpoints existing for the robot which
- * have the same encoder path arc lengths.
- *
- * Instead of using wheel path arc lengths (which are in the robot's local
- * coordinate frame), nonlinear controllers like pure pursuit and Ramsete use
- * global pose. The controller uses this extra information to guide a linear
- * reference tracker like the PID controllers back in by adjusting the
- * references of the PID controllers.
- *
- * The paper "Control of Wheeled Mobile Robots: An Experimental Overview"
- * describes a nonlinear controller for a wheeled vehicle with unicycle-like
- * kinematics; a global pose consisting of x, y, and theta; and a desired pose
- * consisting of x_d, y_d, and theta_d. We call it Ramsete because that's the
- * acronym for the title of the book it came from in Italian ("Robotica
- * Articolata e Mobile per i SErvizi e le TEcnologie").
- *
- * See <https://file.tavsys.net/control/controls-engineering-in-frc.pdf> section
- * on Ramsete unicycle controller for a derivation and analysis.
- */
-class RamseteController {
- public:
-  /**
-   * Construct a Ramsete unicycle controller.
-   *
-   * @param b    Tuning parameter (b > 0) for which larger values make
-   *             convergence more aggressive like a proportional term.
-   * @param zeta Tuning parameter (0 < zeta < 1) for which larger values provide
-   *             more damping in response.
-   */
-  RamseteController(double b, double zeta);
-
-  /**
-   * Construct a Ramsete unicycle controller. The default arguments for
-   * b and zeta of 2.0 and 0.7 have been well-tested to produce desirable
-   * results.
-   */
-  RamseteController() : RamseteController(2.0, 0.7) {}
-
-  /**
-   * Returns true if the pose error is within tolerance of the reference.
-   */
-  bool AtReference() const;
-
-  /**
-   * Sets the pose error which is considered tolerable for use with
-   * AtReference().
-   *
-   * @param poseTolerance Pose error which is tolerable.
-   */
-  void SetTolerance(const Pose2d& poseTolerance);
-
-  /**
-   * Returns the next output of the Ramsete controller.
-   *
-   * The reference pose, linear velocity, and angular velocity should come from
-   * a drivetrain trajectory.
-   *
-   * @param currentPose        The current pose.
-   * @param poseRef            The desired pose.
-   * @param linearVelocityRef  The desired linear velocity.
-   * @param angularVelocityRef The desired angular velocity.
-   */
-  ChassisSpeeds Calculate(const Pose2d& currentPose, const Pose2d& poseRef,
-                          units::meters_per_second_t linearVelocityRef,
-                          units::radians_per_second_t angularVelocityRef);
-
-  /**
-   * Returns the next output of the Ramsete controller.
-   *
-   * The reference pose, linear velocity, and angular velocity should come from
-   * a drivetrain trajectory.
-   *
-   * @param currentPose  The current pose.
-   * @param desiredState The desired pose, linear velocity, and angular velocity
-   *                     from a trajectory.
-   */
-  ChassisSpeeds Calculate(const Pose2d& currentPose,
-                          const Trajectory::State& desiredState);
-
-  /**
-   * Enables and disables the controller for troubleshooting purposes.
-   *
-   * @param enabled If the controller is enabled or not.
-   */
-  void SetEnabled(bool enabled);
-
- private:
-  double m_b;
-  double m_zeta;
-
-  Pose2d m_poseError;
-  Pose2d m_poseTolerance;
-  bool m_enabled = true;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/drive/DifferentialDrive.h b/wpilibc/src/main/native/include/frc/drive/DifferentialDrive.h
index 86103de..50a7a3f 100644
--- a/wpilibc/src/main/native/include/frc/drive/DifferentialDrive.h
+++ b/wpilibc/src/main/native/include/frc/drive/DifferentialDrive.h
@@ -1,20 +1,29 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/raw_ostream.h>
+#include <string>
+
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/drive/RobotDriveBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 class SpeedController;
 
 /**
@@ -22,9 +31,9 @@
  * the Kit of Parts drive base, "tank drive", or West Coast Drive.
  *
  * These drive bases typically have drop-center / skid-steer with two or more
- * wheels per side (e.g., 6WD or 8WD). This class takes a SpeedController per
+ * wheels per side (e.g., 6WD or 8WD). This class takes a MotorController per
  * side. For four and six motor drivetrains, construct and pass in
- * SpeedControllerGroup instances as follows.
+ * MotorControllerGroup instances as follows.
  *
  * Four motor drivetrain:
  * @code{.cpp}
@@ -32,11 +41,11 @@
  *  public:
  *   frc::PWMVictorSPX m_frontLeft{1};
  *   frc::PWMVictorSPX m_rearLeft{2};
- *   frc::SpeedControllerGroup m_left{m_frontLeft, m_rearLeft};
+ *   frc::MotorControllerGroup m_left{m_frontLeft, m_rearLeft};
  *
  *   frc::PWMVictorSPX m_frontRight{3};
  *   frc::PWMVictorSPX m_rearRight{4};
- *   frc::SpeedControllerGroup m_right{m_frontRight, m_rearRight};
+ *   frc::MotorControllerGroup m_right{m_frontRight, m_rearRight};
  *
  *   frc::DifferentialDrive m_drive{m_left, m_right};
  * };
@@ -49,12 +58,12 @@
  *   frc::PWMVictorSPX m_frontLeft{1};
  *   frc::PWMVictorSPX m_midLeft{2};
  *   frc::PWMVictorSPX m_rearLeft{3};
- *   frc::SpeedControllerGroup m_left{m_frontLeft, m_midLeft, m_rearLeft};
+ *   frc::MotorControllerGroup m_left{m_frontLeft, m_midLeft, m_rearLeft};
  *
  *   frc::PWMVictorSPX m_frontRight{4};
  *   frc::PWMVictorSPX m_midRight{5};
  *   frc::PWMVictorSPX m_rearRight{6};
- *   frc::SpeedControllerGroup m_right{m_frontRight, m_midRight, m_rearRight};
+ *   frc::MotorControllerGroup m_right{m_frontRight, m_midRight, m_rearRight};
  *
  *   frc::DifferentialDrive m_drive{m_left, m_right};
  * };
@@ -87,28 +96,20 @@
  * Inputs smaller then 0.02 will be set to 0, and larger values will be scaled
  * so that the full range is still used. This deadband value can be changed
  * with SetDeadband().
- *
- * <p>RobotDrive porting guide:
- * <br>TankDrive(double, double, bool) is equivalent to
- * RobotDrive#TankDrive(double, double, bool) if a deadband of 0 is used.
- * <br>ArcadeDrive(double, double, bool) is equivalent to
- * RobotDrive#ArcadeDrive(double, double, bool) if a deadband of 0 is used
- * and the the rotation input is inverted eg ArcadeDrive(y, -rotation, false)
- * <br>CurvatureDrive(double, double, bool) is similar in concept to
- * RobotDrive#Drive(double, double) with the addition of a quick turn
- * mode. However, it is not designed to give exactly the same response.
  */
 class DifferentialDrive : public RobotDriveBase,
-                          public Sendable,
-                          public SendableHelper<DifferentialDrive> {
+                          public wpi::Sendable,
+                          public wpi::SendableHelper<DifferentialDrive> {
  public:
-  static constexpr double kDefaultQuickStopThreshold = 0.2;
-  static constexpr double kDefaultQuickStopAlpha = 0.1;
+  struct WheelSpeeds {
+    double left = 0.0;
+    double right = 0.0;
+  };
 
   /**
    * Construct a DifferentialDrive.
    *
-   * To pass multiple motors per side, use a SpeedControllerGroup. If a motor
+   * To pass multiple motors per side, use a MotorControllerGroup. If a motor
    * needs to be inverted, do so before passing it in.
    */
   DifferentialDrive(SpeedController& leftMotor, SpeedController& rightMotor);
@@ -137,17 +138,16 @@
    *
    * The rotation argument controls the curvature of the robot's path rather
    * than its rate of heading change. This makes the robot more controllable at
-   * high speeds. Also handles the robot's quick turn functionality - "quick
-   * turn" overrides constant-curvature turning for turn-in-place maneuvers.
+   * high speeds.
    *
-   * @param xSpeed      The robot's speed along the X axis [-1.0..1.0]. Forward
-   *                    is positive.
-   * @param zRotation   The robot's rotation rate around the Z axis [-1.0..1.0].
-   *                    Clockwise is positive.
-   * @param isQuickTurn If set, overrides constant-curvature turning for
-   *                    turn-in-place maneuvers.
+   * @param xSpeed           The robot's speed along the X axis [-1.0..1.0].
+   *                         Forward is positive.
+   * @param zRotation        The robot's rotation rate around the Z axis
+   *                         [-1.0..1.0]. Clockwise is positive.
+   * @param allowTurnInPlace If set, overrides constant-curvature turning for
+   *                         turn-in-place maneuvers.
    */
-  void CurvatureDrive(double xSpeed, double zRotation, bool isQuickTurn);
+  void CurvatureDrive(double xSpeed, double zRotation, bool allowTurnInPlace);
 
   /**
    * Tank drive method for differential drive platform.
@@ -161,65 +161,65 @@
   void TankDrive(double leftSpeed, double rightSpeed, bool squareInputs = true);
 
   /**
-   * Sets the QuickStop speed threshold in curvature drive.
+   * Arcade drive inverse kinematics for differential drive platform.
    *
-   * QuickStop compensates for the robot's moment of inertia when stopping after
-   * a QuickTurn.
+   * Note: Some drivers may prefer inverted rotation controls. This can be done
+   * by negating the value passed for rotation.
    *
-   * While QuickTurn is enabled, the QuickStop accumulator takes on the rotation
-   * rate value outputted by the low-pass filter when the robot's speed along
-   * the X axis is below the threshold. When QuickTurn is disabled, the
-   * accumulator's value is applied against the computed angular power request
-   * to slow the robot's rotation.
-   *
-   * @param threshold X speed below which quick stop accumulator will receive
-   *                  rotation rate values [0..1.0].
+   * @param xSpeed       The speed at which the robot should drive along the X
+   *                     axis [-1.0..1.0]. Forward is positive.
+   * @param zRotation    The rotation rate of the robot around the Z axis
+   *                     [-1.0..1.0]. Clockwise is positive.
+   * @param squareInputs If set, decreases the input sensitivity at low speeds.
    */
-  void SetQuickStopThreshold(double threshold);
+  static WheelSpeeds ArcadeDriveIK(double xSpeed, double zRotation,
+                                   bool squareInputs = true);
 
   /**
-   * Sets the low-pass filter gain for QuickStop in curvature drive.
+   * Curvature drive inverse kinematics for differential drive platform.
    *
-   * The low-pass filter filters incoming rotation rate commands to smooth out
-   * high frequency changes.
+   * The rotation argument controls the curvature of the robot's path rather
+   * than its rate of heading change. This makes the robot more controllable at
+   * high speeds.
    *
-   * @param alpha Low-pass filter gain [0.0..2.0]. Smaller values result in
-   *              slower output changes. Values between 1.0 and 2.0 result in
-   *              output oscillation. Values below 0.0 and above 2.0 are
-   *              unstable.
+   * @param xSpeed           The robot's speed along the X axis [-1.0..1.0].
+   *                         Forward is positive.
+   * @param zRotation        The robot's rotation rate around the Z axis
+   *                         [-1.0..1.0]. Clockwise is positive.
+   * @param allowTurnInPlace If set, overrides constant-curvature turning for
+   *                         turn-in-place maneuvers.
    */
-  void SetQuickStopAlpha(double alpha);
+  static WheelSpeeds CurvatureDriveIK(double xSpeed, double zRotation,
+                                      bool allowTurnInPlace);
 
   /**
-   * Gets if the power sent to the right side of the drivetrain is multiplied by
-   * -1.
+   * Tank drive inverse kinematics for differential drive platform.
    *
-   * @return true if the right side is inverted
+   * @param leftSpeed    The robot left side's speed along the X axis
+   *                     [-1.0..1.0]. Forward is positive.
+   * @param rightSpeed   The robot right side's speed along the X axis
+   *                     [-1.0..1.0]. Forward is positive.
+   * @param squareInputs If set, decreases the input sensitivity at low speeds.
    */
-  bool IsRightSideInverted() const;
-
-  /**
-   * Sets if the power sent to the right side of the drivetrain should be
-   * multiplied by -1.
-   *
-   * @param rightSideInverted true if right side power should be multiplied by
-   * -1
-   */
-  void SetRightSideInverted(bool rightSideInverted);
+  static WheelSpeeds TankDriveIK(double leftSpeed, double rightSpeed,
+                                 bool squareInputs = true);
 
   void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
+  std::string GetDescription() const override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   SpeedController* m_leftMotor;
   SpeedController* m_rightMotor;
-
-  double m_quickStopThreshold = kDefaultQuickStopThreshold;
-  double m_quickStopAlpha = kDefaultQuickStopAlpha;
-  double m_quickStopAccumulator = 0.0;
-  double m_rightSideInvertMultiplier = -1.0;
 };
 
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/drive/KilloughDrive.h b/wpilibc/src/main/native/include/frc/drive/KilloughDrive.h
index 2cc1c91..1acc69f 100644
--- a/wpilibc/src/main/native/include/frc/drive/KilloughDrive.h
+++ b/wpilibc/src/main/native/include/frc/drive/KilloughDrive.h
@@ -1,23 +1,31 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string>
 
-#include <wpi/raw_ostream.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/drive/RobotDriveBase.h"
 #include "frc/drive/Vector2d.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 class SpeedController;
 
 /**
@@ -47,13 +55,19 @@
  * clockwise rotation around the Z axis is positive.
  */
 class KilloughDrive : public RobotDriveBase,
-                      public Sendable,
-                      public SendableHelper<KilloughDrive> {
+                      public wpi::Sendable,
+                      public wpi::SendableHelper<KilloughDrive> {
  public:
   static constexpr double kDefaultLeftMotorAngle = 60.0;
   static constexpr double kDefaultRightMotorAngle = 120.0;
   static constexpr double kDefaultBackMotorAngle = 270.0;
 
+  struct WheelSpeeds {
+    double left = 0.0;
+    double right = 0.0;
+    double back = 0.0;
+  };
+
   /**
    * Construct a Killough drive with the given motors and default motor angles.
    *
@@ -126,10 +140,28 @@
    */
   void DrivePolar(double magnitude, double angle, double zRotation);
 
-  void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
+  /**
+   * Cartesian inverse kinematics for Killough platform.
+   *
+   * Angles are measured clockwise from the positive X axis. The robot's speed
+   * is independent from its angle or rotation rate.
+   *
+   * @param ySpeed    The robot's speed along the Y axis [-1.0..1.0]. Right is
+   *                  positive.
+   * @param xSpeed    The robot's speed along the X axis [-1.0..1.0]. Forward is
+   *                  positive.
+   * @param zRotation The robot's rotation rate around the Z axis [-1.0..1.0].
+   *                  Clockwise is positive.
+   * @param gyroAngle The current angle reading from the gyro in degrees around
+   *                  the Z axis. Use this to implement field-oriented controls.
+   */
+  WheelSpeeds DriveCartesianIK(double ySpeed, double xSpeed, double zRotation,
+                               double gyroAngle = 0.0);
 
-  void InitSendable(SendableBuilder& builder) override;
+  void StopMotor() override;
+  std::string GetDescription() const override;
+
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   SpeedController* m_leftMotor;
@@ -143,4 +175,12 @@
   bool reported = false;
 };
 
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/drive/MecanumDrive.h b/wpilibc/src/main/native/include/frc/drive/MecanumDrive.h
index 8435b4d..809e7ea 100644
--- a/wpilibc/src/main/native/include/frc/drive/MecanumDrive.h
+++ b/wpilibc/src/main/native/include/frc/drive/MecanumDrive.h
@@ -1,22 +1,30 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string>
 
-#include <wpi/raw_ostream.h>
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 #include "frc/drive/RobotDriveBase.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
 
 namespace frc {
 
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 class SpeedController;
 
 /**
@@ -52,22 +60,29 @@
  * with SetDeadband().
  *
  * RobotDrive porting guide:
- * <br>In MecanumDrive, the right side speed controllers are automatically
- * inverted, while in RobotDrive, no speed controllers are automatically
+ * <br>In MecanumDrive, the right side motor controllers are automatically
+ * inverted, while in RobotDrive, no motor controllers are automatically
  * inverted.
  * <br>DriveCartesian(double, double, double, double) is equivalent to
- * RobotDrive#MecanumDrive_Cartesian(double, double, double, double)
+ * RobotDrive's MecanumDrive_Cartesian(double, double, double, double)
  * if a deadband of 0 is used, and the ySpeed and gyroAngle values are inverted
  * compared to RobotDrive (eg DriveCartesian(xSpeed, -ySpeed, zRotation,
  * -gyroAngle).
  * <br>DrivePolar(double, double, double) is equivalent to
- * RobotDrive#MecanumDrive_Polar(double, double, double) if a
+ * RobotDrive's MecanumDrive_Polar(double, double, double) if a
  * deadband of 0 is used.
  */
 class MecanumDrive : public RobotDriveBase,
-                     public Sendable,
-                     public SendableHelper<MecanumDrive> {
+                     public wpi::Sendable,
+                     public wpi::SendableHelper<MecanumDrive> {
  public:
+  struct WheelSpeeds {
+    double frontLeft = 0.0;
+    double frontRight = 0.0;
+    double rearLeft = 0.0;
+    double rearRight = 0.0;
+  };
+
   /**
    * Construct a MecanumDrive.
    *
@@ -116,26 +131,27 @@
   void DrivePolar(double magnitude, double angle, double zRotation);
 
   /**
-   * Gets if the power sent to the right side of the drivetrain is multiplied by
-   * -1.
+   * Cartesian inverse kinematics for Mecanum platform.
    *
-   * @return true if the right side is inverted
-   */
-  bool IsRightSideInverted() const;
-
-  /**
-   * Sets if the power sent to the right side of the drivetrain should be
-   * multiplied by -1.
+   * Angles are measured clockwise from the positive X axis. The robot's speed
+   * is independent from its angle or rotation rate.
    *
-   * @param rightSideInverted true if right side power should be multiplied by
-   * -1
+   * @param ySpeed    The robot's speed along the Y axis [-1.0..1.0]. Right is
+   *                  positive.
+   * @param xSpeed    The robot's speed along the X axis [-1.0..1.0]. Forward is
+   *                  positive.
+   * @param zRotation The robot's rotation rate around the Z axis [-1.0..1.0].
+   *                  Clockwise is positive.
+   * @param gyroAngle The current angle reading from the gyro in degrees around
+   *                  the Z axis. Use this to implement field-oriented controls.
    */
-  void SetRightSideInverted(bool rightSideInverted);
+  static WheelSpeeds DriveCartesianIK(double ySpeed, double xSpeed,
+                                      double zRotation, double gyroAngle = 0.0);
 
   void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
+  std::string GetDescription() const override;
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   SpeedController* m_frontLeftMotor;
@@ -143,9 +159,15 @@
   SpeedController* m_frontRightMotor;
   SpeedController* m_rearRightMotor;
 
-  double m_rightSideInvertMultiplier = -1.0;
-
   bool reported = false;
 };
 
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/drive/RobotDriveBase.h b/wpilibc/src/main/native/include/frc/drive/RobotDriveBase.h
index ce9cbc5..389d67b 100644
--- a/wpilibc/src/main/native/include/frc/drive/RobotDriveBase.h
+++ b/wpilibc/src/main/native/include/frc/drive/RobotDriveBase.h
@@ -1,23 +1,19 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string>
 
-#include <wpi/ArrayRef.h>
-#include <wpi/raw_ostream.h>
+#include <wpi/deprecated.h>
+#include <wpi/span.h>
 
 #include "frc/MotorSafety.h"
 
 namespace frc {
 
-class SpeedController;
-
 /**
  * Common base class for drive platforms.
  */
@@ -47,7 +43,7 @@
    *
    * The default value is 0.02. Inputs smaller than the deadband are set to 0.0
    * while inputs larger than the deadband are scaled from 0.0 to 1.0. See
-   * ApplyDeadband().
+   * frc::ApplyDeadband().
    *
    * @param deadband The deadband to set.
    */
@@ -71,7 +67,7 @@
   void FeedWatchdog();
 
   void StopMotor() override = 0;
-  void GetDescription(wpi::raw_ostream& desc) const override = 0;
+  std::string GetDescription() const override = 0;
 
  protected:
   /**
@@ -80,14 +76,16 @@
    *
    * @param value    value to clip
    * @param deadband range around zero
+   * @deprecated Use ApplyDeadband() in frc/MathUtil.h.
    */
-  double ApplyDeadband(double number, double deadband);
+  WPI_DEPRECATED("Use ApplyDeadband() in frc/MathUtil.h")
+  static double ApplyDeadband(double value, double deadband);
 
   /**
    * Normalize all wheel speeds if the magnitude of any wheel is greater than
    * 1.0.
    */
-  void Normalize(wpi::MutableArrayRef<double> wheelSpeeds);
+  static void Normalize(wpi::span<double> wheelSpeeds);
 
   double m_deadband = 0.02;
   double m_maxOutput = 1.0;
diff --git a/wpilibc/src/main/native/include/frc/drive/Vector2d.h b/wpilibc/src/main/native/include/frc/drive/Vector2d.h
index c9bd08a..92a3de6 100644
--- a/wpilibc/src/main/native/include/frc/drive/Vector2d.h
+++ b/wpilibc/src/main/native/include/frc/drive/Vector2d.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/filters/Filter.h b/wpilibc/src/main/native/include/frc/filters/Filter.h
deleted file mode 100644
index fb14d28..0000000
--- a/wpilibc/src/main/native/include/frc/filters/Filter.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-
-#include <wpi/deprecated.h>
-
-#include "frc/PIDSource.h"
-
-namespace frc {
-
-/**
- * Interface for filters
- *
- * @deprecated only used by the deprecated LinearDigitalFilter
- */
-class Filter : public PIDSource {
- public:
-  WPI_DEPRECATED("This class is no longer used.")
-  explicit Filter(PIDSource& source);
-  WPI_DEPRECATED("This class is no longer used.")
-  explicit Filter(std::shared_ptr<PIDSource> source);
-  virtual ~Filter() = default;
-
-  Filter(Filter&&) = default;
-  Filter& operator=(Filter&&) = default;
-
-  // PIDSource interface
-  void SetPIDSourceType(PIDSourceType pidSource) override;
-  PIDSourceType GetPIDSourceType() const override;
-  double PIDGet() override = 0;
-
-  /**
-   * Returns the current filter estimate without also inserting new data as
-   * PIDGet() would do.
-   *
-   * @return The current filter estimate
-   */
-  virtual double Get() const = 0;
-
-  /**
-   * Reset the filter state
-   */
-  virtual void Reset() = 0;
-
- protected:
-  /**
-   * Calls PIDGet() of source
-   *
-   * @return Current value of source
-   */
-  double PIDGetSource();
-
- private:
-  std::shared_ptr<PIDSource> m_source;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/filters/LinearDigitalFilter.h b/wpilibc/src/main/native/include/frc/filters/LinearDigitalFilter.h
deleted file mode 100644
index c4fc3ef..0000000
--- a/wpilibc/src/main/native/include/frc/filters/LinearDigitalFilter.h
+++ /dev/null
@@ -1,226 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2015-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <initializer_list>
-#include <memory>
-#include <vector>
-
-#include <wpi/ArrayRef.h>
-#include <wpi/circular_buffer.h>
-#include <wpi/deprecated.h>
-
-#include "frc/filters/Filter.h"
-
-namespace frc {
-
-/**
- * This class implements a linear, digital filter. All types of FIR and IIR
- * filters are supported. Static factory methods are provided to create commonly
- * used types of filters.
- *
- * Filters are of the form:<br>
- *  y[n] = (b0 * x[n] + b1 * x[n-1] + ... + bP * x[n-P]) -
- *         (a0 * y[n-1] + a2 * y[n-2] + ... + aQ * y[n-Q])
- *
- * Where:<br>
- *  y[n] is the output at time "n"<br>
- *  x[n] is the input at time "n"<br>
- *  y[n-1] is the output from the LAST time step ("n-1")<br>
- *  x[n-1] is the input from the LAST time step ("n-1")<br>
- *  b0...bP are the "feedforward" (FIR) gains<br>
- *  a0...aQ are the "feedback" (IIR) gains<br>
- * IMPORTANT! Note the "-" sign in front of the feedback term! This is a common
- *            convention in signal processing.
- *
- * What can linear filters do? Basically, they can filter, or diminish, the
- * effects of undesirable input frequencies. High frequencies, or rapid changes,
- * can be indicative of sensor noise or be otherwise undesirable. A "low pass"
- * filter smooths out the signal, reducing the impact of these high frequency
- * components.  Likewise, a "high pass" filter gets rid of slow-moving signal
- * components, letting you detect large changes more easily.
- *
- * Example FRC applications of filters:
- *  - Getting rid of noise from an analog sensor input (note: the roboRIO's FPGA
- *    can do this faster in hardware)
- *  - Smoothing out joystick input to prevent the wheels from slipping or the
- *    robot from tipping
- *  - Smoothing motor commands so that unnecessary strain isn't put on
- *    electrical or mechanical components
- *  - If you use clever gains, you can make a PID controller out of this class!
- *
- * For more on filters, I highly recommend the following articles:<br>
- *  http://en.wikipedia.org/wiki/Linear_filter<br>
- *  http://en.wikipedia.org/wiki/Iir_filter<br>
- *  http://en.wikipedia.org/wiki/Fir_filter<br>
- *
- * Note 1: PIDGet() should be called by the user on a known, regular period.
- * You can set up a Notifier to do this (look at the WPILib PIDController
- * class), or do it "inline" with code in a periodic function.
- *
- * Note 2: For ALL filters, gains are necessarily a function of frequency. If
- * you make a filter that works well for you at, say, 100Hz, you will most
- * definitely need to adjust the gains if you then want to run it at 200Hz!
- * Combining this with Note 1 - the impetus is on YOU as a developer to make
- * sure PIDGet() gets called at the desired, constant frequency!
- *
- * @deprecated Use LinearFilter class instead
- */
-class LinearDigitalFilter : public Filter {
- public:
-  /**
-   * Create a linear FIR or IIR filter.
-   *
-   * @param source  The PIDSource object that is used to get values
-   * @param ffGains The "feed forward" or FIR gains
-   * @param fbGains The "feed back" or IIR gains
-   */
-  WPI_DEPRECATED("Use LinearFilter class instead.")
-  LinearDigitalFilter(PIDSource& source, wpi::ArrayRef<double> ffGains,
-                      wpi::ArrayRef<double> fbGains);
-
-  /**
-   * Create a linear FIR or IIR filter.
-   *
-   * @param source  The PIDSource object that is used to get values
-   * @param ffGains The "feed forward" or FIR gains
-   * @param fbGains The "feed back" or IIR gains
-   */
-  WPI_DEPRECATED("Use LinearFilter class instead.")
-  LinearDigitalFilter(PIDSource& source, std::initializer_list<double> ffGains,
-                      std::initializer_list<double> fbGains);
-
-  /**
-   * Create a linear FIR or IIR filter.
-   *
-   * @param source  The PIDSource object that is used to get values
-   * @param ffGains The "feed forward" or FIR gains
-   * @param fbGains The "feed back" or IIR gains
-   */
-  WPI_DEPRECATED("Use LinearFilter class instead.")
-  LinearDigitalFilter(std::shared_ptr<PIDSource> source,
-                      wpi::ArrayRef<double> ffGains,
-                      wpi::ArrayRef<double> fbGains);
-
-  /**
-   * Create a linear FIR or IIR filter.
-   *
-   * @param source  The PIDSource object that is used to get values
-   * @param ffGains The "feed forward" or FIR gains
-   * @param fbGains The "feed back" or IIR gains
-   */
-  WPI_DEPRECATED("Use LinearFilter class instead.")
-  LinearDigitalFilter(std::shared_ptr<PIDSource> source,
-                      std::initializer_list<double> ffGains,
-                      std::initializer_list<double> fbGains);
-
-  LinearDigitalFilter(LinearDigitalFilter&&) = default;
-  LinearDigitalFilter& operator=(LinearDigitalFilter&&) = default;
-
-  // Static methods to create commonly used filters
-  /**
-   * Creates a one-pole IIR low-pass filter of the form:<br>
-   *   y[n] = (1 - gain) * x[n] + gain * y[n-1]<br>
-   * where gain = e<sup>-dt / T</sup>, T is the time constant in seconds
-   *
-   * This filter is stable for time constants greater than zero.
-   *
-   * @param source       The PIDSource object that is used to get values
-   * @param timeConstant The discrete-time time constant in seconds
-   * @param period       The period in seconds between samples taken by the user
-   */
-  static LinearDigitalFilter SinglePoleIIR(PIDSource& source,
-                                           double timeConstant, double period);
-
-  /**
-   * Creates a first-order high-pass filter of the form:<br>
-   *   y[n] = gain * x[n] + (-gain) * x[n-1] + gain * y[n-1]<br>
-   * where gain = e<sup>-dt / T</sup>, T is the time constant in seconds
-   *
-   * This filter is stable for time constants greater than zero.
-   *
-   * @param source       The PIDSource object that is used to get values
-   * @param timeConstant The discrete-time time constant in seconds
-   * @param period       The period in seconds between samples taken by the user
-   */
-  static LinearDigitalFilter HighPass(PIDSource& source, double timeConstant,
-                                      double period);
-
-  /**
-   * Creates a K-tap FIR moving average filter of the form:<br>
-   *   y[n] = 1/k * (x[k] + x[k-1] + … + x[0])
-   *
-   * This filter is always stable.
-   *
-   * @param source The PIDSource object that is used to get values
-   * @param taps   The number of samples to average over. Higher = smoother but
-   *               slower
-   */
-  static LinearDigitalFilter MovingAverage(PIDSource& source, int taps);
-
-  /**
-   * Creates a one-pole IIR low-pass filter of the form:<br>
-   *   y[n] = (1 - gain) * x[n] + gain * y[n-1]<br>
-   * where gain = e<sup>-dt / T</sup>, T is the time constant in seconds
-   *
-   * This filter is stable for time constants greater than zero.
-   *
-   * @param source       The PIDSource object that is used to get values
-   * @param timeConstant The discrete-time time constant in seconds
-   * @param period       The period in seconds between samples taken by the user
-   */
-  static LinearDigitalFilter SinglePoleIIR(std::shared_ptr<PIDSource> source,
-                                           double timeConstant, double period);
-
-  /**
-   * Creates a first-order high-pass filter of the form:<br>
-   *   y[n] = gain * x[n] + (-gain) * x[n-1] + gain * y[n-1]<br>
-   * where gain = e<sup>-dt / T</sup>, T is the time constant in seconds
-   *
-   * This filter is stable for time constants greater than zero.
-   *
-   * @param source       The PIDSource object that is used to get values
-   * @param timeConstant The discrete-time time constant in seconds
-   * @param period       The period in seconds between samples taken by the user
-   */
-  static LinearDigitalFilter HighPass(std::shared_ptr<PIDSource> source,
-                                      double timeConstant, double period);
-
-  /**
-   * Creates a K-tap FIR moving average filter of the form:<br>
-   *   y[n] = 1/k * (x[k] + x[k-1] + … + x[0])
-   *
-   * This filter is always stable.
-   *
-   * @param source The PIDSource object that is used to get values
-   * @param taps   The number of samples to average over. Higher = smoother but
-   *               slower
-   */
-  static LinearDigitalFilter MovingAverage(std::shared_ptr<PIDSource> source,
-                                           int taps);
-
-  // Filter interface
-  double Get() const override;
-  void Reset() override;
-
-  // PIDSource interface
-  /**
-   * Calculates the next value of the filter
-   *
-   * @return The filtered value at this step
-   */
-  double PIDGet() override;
-
- private:
-  wpi::circular_buffer<double> m_inputs;
-  wpi::circular_buffer<double> m_outputs;
-  std::vector<double> m_inputGains;
-  std::vector<double> m_outputGains;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/interfaces/Accelerometer.h b/wpilibc/src/main/native/include/frc/interfaces/Accelerometer.h
index 499ba5b..c95466a 100644
--- a/wpilibc/src/main/native/include/frc/interfaces/Accelerometer.h
+++ b/wpilibc/src/main/native/include/frc/interfaces/Accelerometer.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/interfaces/Gyro.h b/wpilibc/src/main/native/include/frc/interfaces/Gyro.h
index 8c06993..50417ea 100644
--- a/wpilibc/src/main/native/include/frc/interfaces/Gyro.h
+++ b/wpilibc/src/main/native/include/frc/interfaces/Gyro.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2014-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/interfaces/Potentiometer.h b/wpilibc/src/main/native/include/frc/interfaces/Potentiometer.h
deleted file mode 100644
index 219e6ba..0000000
--- a/wpilibc/src/main/native/include/frc/interfaces/Potentiometer.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include "frc/PIDSource.h"
-
-namespace frc {
-
-/**
- * Interface for potentiometers.
- */
-class Potentiometer : public PIDSource {
- public:
-  Potentiometer() = default;
-  virtual ~Potentiometer() = default;
-
-  Potentiometer(Potentiometer&&) = default;
-  Potentiometer& operator=(Potentiometer&&) = default;
-
-  /**
-   * Common interface for getting the current value of a potentiometer.
-   *
-   * @return The current set speed. Value is between -1.0 and 1.0.
-   */
-  virtual double Get() const = 0;
-
-  void SetPIDSourceType(PIDSourceType pidSource) override;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/livewindow/LiveWindow.h b/wpilibc/src/main/native/include/frc/livewindow/LiveWindow.h
index b755f46..6851cde 100644
--- a/wpilibc/src/main/native/include/frc/livewindow/LiveWindow.h
+++ b/wpilibc/src/main/native/include/frc/livewindow/LiveWindow.h
@@ -1,66 +1,77 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2012-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
-#include <memory>
+
+#include <wpi/deprecated.h>
+
+namespace wpi {
+class Sendable;
+}  // namespace wpi
 
 namespace frc {
 
-class Sendable;
-
 /**
  * The LiveWindow class is the public interface for putting sensors and
  * actuators on the LiveWindow.
  */
 class LiveWindow {
  public:
-  LiveWindow(const LiveWindow&) = delete;
-  LiveWindow& operator=(const LiveWindow&) = delete;
-
-  std::function<void()> enabled;
-  std::function<void()> disabled;
-
   /**
    * Get an instance of the LiveWindow main class.
    *
    * This is a singleton to guarantee that there is only a single instance
    * regardless of how many times GetInstance is called.
+   * @deprecated Use the static methods unless guaranteeing LiveWindow is
+   * instantiated
    */
+  WPI_DEPRECATED("Use static methods")
   static LiveWindow* GetInstance();
 
   /**
+   * Set function to be called when LiveWindow is enabled.
+   *
+   * @param func function (or nullptr for none)
+   */
+  static void SetEnabledCallback(std::function<void()> func);
+
+  /**
+   * Set function to be called when LiveWindow is disabled.
+   *
+   * @param func function (or nullptr for none)
+   */
+  static void SetDisabledCallback(std::function<void()> func);
+
+  /**
    * Enable telemetry for a single component.
    *
-   * @param sendable component
+   * @param component sendable
    */
-  void EnableTelemetry(Sendable* component);
+  static void EnableTelemetry(wpi::Sendable* component);
 
   /**
    * Disable telemetry for a single component.
    *
-   * @param sendable component
+   * @param component sendable
    */
-  void DisableTelemetry(Sendable* component);
+  static void DisableTelemetry(wpi::Sendable* component);
 
   /**
    * Disable ALL telemetry.
    */
-  void DisableAllTelemetry();
+  static void DisableAllTelemetry();
 
-  bool IsEnabled() const;
+  static bool IsEnabled();
 
   /**
    * Change the enabled status of LiveWindow.
    *
    * If it changes to enabled, start livewindow running otherwise stop it
    */
-  void SetEnabled(bool enabled);
+  static void SetEnabled(bool enabled);
 
   /**
    * Tell all the sensors to update (send) their values.
@@ -68,18 +79,15 @@
    * Actuators are handled through callbacks on their value changing from the
    * SmartDashboard widgets.
    */
-  void UpdateValues();
+  static void UpdateValues();
 
  private:
-  LiveWindow();
-
-  struct Impl;
-  std::unique_ptr<Impl> m_impl;
+  LiveWindow() = default;
 
   /**
    * Updates the entries, without using a mutex or lock.
    */
-  void UpdateValuesUnsafe();
+  static void UpdateValuesUnsafe();
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/DMC60.h b/wpilibc/src/main/native/include/frc/motorcontrol/DMC60.h
similarity index 62%
rename from wpilibc/src/main/native/include/frc/DMC60.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/DMC60.h
index ecf01e1..f47826a 100644
--- a/wpilibc/src/main/native/include/frc/DMC60.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/DMC60.h
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
 /**
- * Digilent DMC 60 Speed Controller.
+ * Digilent DMC 60 Motor %Controller.
  *
  * Note that the DMC 60 uses the following bounds for PWM values. These
  * values should work reasonably well for most controllers, but if users
@@ -27,7 +24,7 @@
  * \li 1.480ms = the "low end" of the deadband range
  * \li 0.997ms = full "reverse"
  */
-class DMC60 : public PWMSpeedController {
+class DMC60 : public PWMMotorController {
  public:
   /**
    * Constructor for a Digilent DMC 60.
diff --git a/wpilibc/src/main/native/include/frc/Jaguar.h b/wpilibc/src/main/native/include/frc/motorcontrol/Jaguar.h
similarity index 61%
rename from wpilibc/src/main/native/include/frc/Jaguar.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/Jaguar.h
index 7a8503e..d25a457 100644
--- a/wpilibc/src/main/native/include/frc/Jaguar.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/Jaguar.h
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
 /**
- * Luminary Micro / Vex Robotics Jaguar Speed Controller with PWM control.
+ * Luminary Micro / Vex Robotics Jaguar Motor %Controller with PWM control.
  *
  * Note that the Jaguar uses the following bounds for PWM values. These values
  * should work reasonably well for most controllers, but if users experience
@@ -27,7 +24,7 @@
  * \li 1.454ms = the "low end" of the deadband range
  * \li 0.697ms = full "reverse"
  */
-class Jaguar : public PWMSpeedController {
+class Jaguar : public PWMMotorController {
  public:
   /**
    * Constructor for a Jaguar connected via PWM.
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/MotorController.h b/wpilibc/src/main/native/include/frc/motorcontrol/MotorController.h
new file mode 100644
index 0000000..8ed19bc
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/MotorController.h
@@ -0,0 +1,37 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <units/voltage.h>
+
+#include "frc/SpeedController.h"
+
+namespace frc {
+
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable : 4996)  // was declared deprecated
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
+/**
+ * Interface for motor controlling devices.
+ */
+class MotorController : public SpeedController {};
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.h b/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.h
new file mode 100644
index 0000000..6f47bf9
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.h
@@ -0,0 +1,51 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <functional>
+#include <vector>
+
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/motorcontrol/MotorController.h"
+
+namespace frc {
+
+/**
+ * Allows multiple MotorController objects to be linked together.
+ */
+class MotorControllerGroup : public wpi::Sendable,
+                             public MotorController,
+                             public wpi::SendableHelper<MotorControllerGroup> {
+ public:
+  template <class... MotorControllers>
+  explicit MotorControllerGroup(MotorController& motorController,
+                                MotorControllers&... motorControllers);
+  explicit MotorControllerGroup(
+      std::vector<std::reference_wrapper<MotorController>>&& motorControllers);
+
+  MotorControllerGroup(MotorControllerGroup&&) = default;
+  MotorControllerGroup& operator=(MotorControllerGroup&&) = default;
+
+  void Set(double speed) override;
+  double Get() const override;
+  void SetInverted(bool isInverted) override;
+  bool GetInverted() const override;
+  void Disable() override;
+  void StopMotor() override;
+
+  void InitSendable(wpi::SendableBuilder& builder) override;
+
+ private:
+  bool m_isInverted = false;
+  std::vector<std::reference_wrapper<MotorController>> m_motorControllers;
+
+  void Initialize();
+};
+
+}  // namespace frc
+
+#include "frc/motorcontrol/MotorControllerGroup.inc"
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.inc b/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.inc
new file mode 100644
index 0000000..8f87635
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/MotorControllerGroup.inc
@@ -0,0 +1,22 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <functional>
+#include <vector>
+
+#include "frc/motorcontrol/MotorControllerGroup.h"
+
+namespace frc {
+
+template <class... MotorControllers>
+MotorControllerGroup::MotorControllerGroup(
+    MotorController& motorController, MotorControllers&... motorControllers)
+    : m_motorControllers(std::vector<std::reference_wrapper<MotorController>>{
+          motorController, motorControllers...}) {
+  Initialize();
+}
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/NidecBrushless.h b/wpilibc/src/main/native/include/frc/motorcontrol/NidecBrushless.h
similarity index 61%
rename from wpilibc/src/main/native/include/frc/NidecBrushless.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/NidecBrushless.h
index fa77e28..cc95d71 100644
--- a/wpilibc/src/main/native/include/frc/NidecBrushless.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/NidecBrushless.h
@@ -1,31 +1,28 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
+#include <string>
+
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
 #include "frc/DigitalOutput.h"
-#include "frc/ErrorBase.h"
 #include "frc/MotorSafety.h"
 #include "frc/PWM.h"
-#include "frc/SpeedController.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include "frc/motorcontrol/MotorController.h"
 
 namespace frc {
 
-class SendableBuilder;
-
 /**
  * Nidec Brushless Motor.
  */
-class NidecBrushless : public SpeedController,
+class NidecBrushless : public MotorController,
                        public MotorSafety,
-                       public Sendable,
-                       public SendableHelper<NidecBrushless> {
+                       public wpi::Sendable,
+                       public wpi::SendableHelper<NidecBrushless> {
  public:
   /**
    * Constructor.
@@ -42,7 +39,7 @@
   NidecBrushless(NidecBrushless&&) = default;
   NidecBrushless& operator=(NidecBrushless&&) = default;
 
-  // SpeedController interface
+  // MotorController interface
   /**
    * Set the PWM value.
    *
@@ -76,17 +73,9 @@
    */
   void Enable();
 
-  // PIDOutput interface
-  /**
-   * Write out the PID value as seen in the PIDOutput base object.
-   *
-   * @param output Write out the PWM value as was found in the PIDController
-   */
-  void PIDWrite(double output) override;
-
   // MotorSafety interface
   void StopMotor() override;
-  void GetDescription(wpi::raw_ostream& desc) const override;
+  std::string GetDescription() const override;
 
   /**
    * Gets the channel number associated with the object.
@@ -96,7 +85,7 @@
   int GetChannel() const;
 
   // Sendable interface
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   bool m_isInverted = false;
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/PWMMotorController.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMMotorController.h
new file mode 100644
index 0000000..ac6ba4b
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMMotorController.h
@@ -0,0 +1,84 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <string>
+#include <string_view>
+
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/MotorSafety.h"
+#include "frc/PWM.h"
+#include "frc/motorcontrol/MotorController.h"
+
+namespace frc {
+class DMA;
+
+/**
+ * Common base class for all PWM Motor Controllers.
+ */
+class PWMMotorController : public MotorController,
+                           public MotorSafety,
+                           public wpi::Sendable,
+                           public wpi::SendableHelper<PWMMotorController> {
+ public:
+  friend class DMA;
+
+  PWMMotorController(PWMMotorController&&) = default;
+  PWMMotorController& operator=(PWMMotorController&&) = default;
+
+  /**
+   * Set the PWM value.
+   *
+   * The PWM value is set using a range of -1.0 to 1.0, appropriately scaling
+   * the value for the FPGA.
+   *
+   * @param value The speed value between -1.0 and 1.0 to set.
+   */
+  void Set(double value) override;
+
+  /**
+   * Get the recently set value of the PWM. This value is affected by the
+   * inversion property. If you want the value that is sent directly to the
+   * MotorController, use PWM::GetSpeed() instead.
+   *
+   * @return The most recently set value for the PWM between -1.0 and 1.0.
+   */
+  double Get() const override;
+
+  void SetInverted(bool isInverted) override;
+
+  bool GetInverted() const override;
+
+  void Disable() override;
+
+  // MotorSafety interface
+  void StopMotor() override;
+  std::string GetDescription() const override;
+
+  int GetChannel() const;
+
+ protected:
+  /**
+   * Constructor for a PWM Motor %Controller connected via PWM.
+   *
+   * @param name Name to use for SendableRegistry
+   * @param channel The PWM channel that the controller is attached to. 0-9 are
+   *                on-board, 10-19 are on the MXP port
+   */
+  PWMMotorController(std::string_view name, int channel);
+
+  void InitSendable(wpi::SendableBuilder& builder) override;
+
+  PWM m_pwm;
+
+ private:
+  bool m_isInverted = false;
+
+  PWM* GetPwm() { return &m_pwm; }
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWMSparkMax.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMSparkMax.h
similarity index 62%
rename from wpilibc/src/main/native/include/frc/PWMSparkMax.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/PWMSparkMax.h
index 3ce6466..45c7bae 100644
--- a/wpilibc/src/main/native/include/frc/PWMSparkMax.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMSparkMax.h
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
 /**
- * REV Robotics SPARK MAX Speed Controller.
+ * REV Robotics SPARK MAX Motor %Controller.
  *
  * Note that the SPARK MAX uses the following bounds for PWM values. These
  * values should work reasonably well for most controllers, but if users
@@ -27,7 +24,7 @@
  * \li 1.460ms = the "low end" of the deadband range
  * \li 0.999ms = full "reverse"
  */
-class PWMSparkMax : public PWMSpeedController {
+class PWMSparkMax : public PWMMotorController {
  public:
   /**
    * Constructor for a SPARK MAX.
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonFX.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonFX.h
new file mode 100644
index 0000000..29aada6
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonFX.h
@@ -0,0 +1,42 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Cross the Road Electronics (CTRE) %Talon FX Motor %Controller with PWM
+ * control.
+ *
+ * Note that the %Talon FX uses the following bounds for PWM values. These
+ * values should work reasonably well for most controllers, but if users
+ * experience issues such as asymmetric behavior around the deadband or
+ * inability to saturate the controller in either direction, calibration is
+ * recommended. The calibration procedure can be found in the %Talon FX User
+ * Manual available from Cross The Road Electronics.
+ *
+ * \li 2.004ms = full "forward"
+ * \li 1.520ms = the "high end" of the deadband range
+ * \li 1.500ms = center of the deadband range (off)
+ * \li 1.480ms = the "low end" of the deadband range
+ * \li 0.997ms = full "reverse"
+ */
+class PWMTalonFX : public PWMMotorController {
+ public:
+  /**
+   * Construct a %Talon FX connected via PWM.
+   *
+   * @param channel The PWM channel that the %Talon FX is attached to. 0-9 are
+   *                on-board, 10-19 are on the MXP port
+   */
+  explicit PWMTalonFX(int channel);
+
+  PWMTalonFX(PWMTalonFX&&) = default;
+  PWMTalonFX& operator=(PWMTalonFX&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonSRX.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonSRX.h
new file mode 100644
index 0000000..9f9e384
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMTalonSRX.h
@@ -0,0 +1,42 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Cross the Road Electronics (CTRE) %Talon SRX Motor %Controller with PWM
+ * control.
+ *
+ * Note that the %Talon SRX uses the following bounds for PWM values. These
+ * values should work reasonably well for most controllers, but if users
+ * experience issues such as asymmetric behavior around the deadband or
+ * inability to saturate the controller in either direction, calibration is
+ * recommended. The calibration procedure can be found in the %Talon SRX User
+ * Manual available from Cross The Road Electronics.
+ *
+ * \li 2.004ms = full "forward"
+ * \li 1.520ms = the "high end" of the deadband range
+ * \li 1.500ms = center of the deadband range (off)
+ * \li 1.480ms = the "low end" of the deadband range
+ * \li 0.997ms = full "reverse"
+ */
+class PWMTalonSRX : public PWMMotorController {
+ public:
+  /**
+   * Construct a %Talon SRX connected via PWM.
+   *
+   * @param channel The PWM channel that the %Talon SRX is attached to. 0-9 are
+   *                on-board, 10-19 are on the MXP port
+   */
+  explicit PWMTalonSRX(int channel);
+
+  PWMTalonSRX(PWMTalonSRX&&) = default;
+  PWMTalonSRX& operator=(PWMTalonSRX&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/PWMVenom.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMVenom.h
similarity index 63%
rename from wpilibc/src/main/native/include/frc/PWMVenom.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/PWMVenom.h
index 189db43..1047e8e 100644
--- a/wpilibc/src/main/native/include/frc/PWMVenom.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMVenom.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
@@ -26,7 +23,7 @@
  * \li 1.480ms = the "low end" of the deadband range
  * \li 0.997ms = full "reverse"
  */
-class PWMVenom : public PWMSpeedController {
+class PWMVenom : public PWMMotorController {
  public:
   /**
    * Construct a Venom connected via PWM.
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/PWMVictorSPX.h b/wpilibc/src/main/native/include/frc/motorcontrol/PWMVictorSPX.h
new file mode 100644
index 0000000..b6bb324
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/PWMVictorSPX.h
@@ -0,0 +1,42 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Cross the Road Electronics (CTRE) %Victor SPX Motor %Controller with PWM
+ * control.
+ *
+ * Note that the %Victor SPX uses the following bounds for PWM values. These
+ * values should work reasonably well for most controllers, but if users
+ * experience issues such as asymmetric behavior around the deadband or
+ * inability to saturate the controller in either direction, calibration is
+ * recommended. The calibration procedure can be found in the %Victor SPX User
+ * Manual available from Cross The Road Electronics.
+ *
+ * \li 2.004ms = full "forward"
+ * \li 1.520ms = the "high end" of the deadband range
+ * \li 1.500ms = center of the deadband range (off)
+ * \li 1.480ms = the "low end" of the deadband range
+ * \li 0.997ms = full "reverse"
+ */
+class PWMVictorSPX : public PWMMotorController {
+ public:
+  /**
+   * Construct a %Victor SPX connected via PWM.
+   *
+   * @param channel The PWM channel that the %Victor SPX is attached to. 0-9
+   *                are on-board, 10-19 are on the MXP port
+   */
+  explicit PWMVictorSPX(int channel);
+
+  PWMVictorSPX(PWMVictorSPX&&) = default;
+  PWMVictorSPX& operator=(PWMVictorSPX&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/SD540.h b/wpilibc/src/main/native/include/frc/motorcontrol/SD540.h
similarity index 61%
rename from wpilibc/src/main/native/include/frc/SD540.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/SD540.h
index 07f7f18..44a0c8c 100644
--- a/wpilibc/src/main/native/include/frc/SD540.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/SD540.h
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
 /**
- * Mindsensors SD540 Speed Controller.
+ * Mindsensors SD540 Motor %Controller.
  *
  * Note that the SD540 uses the following bounds for PWM values. These values
  * should work reasonably well for most controllers, but if users experience
@@ -27,7 +24,7 @@
  * \li 1.44ms = the "low end" of the deadband range
  * \li 0.94ms = full "reverse"
  */
-class SD540 : public PWMSpeedController {
+class SD540 : public PWMMotorController {
  public:
   /**
    * Constructor for a SD540.
diff --git a/wpilibc/src/main/native/include/frc/Spark.h b/wpilibc/src/main/native/include/frc/motorcontrol/Spark.h
similarity index 62%
rename from wpilibc/src/main/native/include/frc/Spark.h
rename to wpilibc/src/main/native/include/frc/motorcontrol/Spark.h
index 24ed8f5..6163234 100644
--- a/wpilibc/src/main/native/include/frc/Spark.h
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/Spark.h
@@ -1,18 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include "frc/PWMSpeedController.h"
+#include "frc/motorcontrol/PWMMotorController.h"
 
 namespace frc {
 
 /**
- * REV Robotics SPARK Speed Controller.
+ * REV Robotics SPARK Motor %Controller.
  *
  * Note that the SPARK uses the following bounds for PWM values. These values
  * should work reasonably well for most controllers, but if users experience
@@ -27,7 +24,7 @@
  * \li 1.460ms = the "low end" of the deadband range
  * \li 0.999ms = full "reverse"
  */
-class Spark : public PWMSpeedController {
+class Spark : public PWMMotorController {
  public:
   /**
    * Constructor for a SPARK.
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/Talon.h b/wpilibc/src/main/native/include/frc/motorcontrol/Talon.h
new file mode 100644
index 0000000..acf5c55
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/Talon.h
@@ -0,0 +1,41 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Cross the Road Electronics (CTRE) %Talon and %Talon SR Motor %Controller.
+ *
+ * Note that the %Talon uses the following bounds for PWM values. These values
+ * should work reasonably well for most controllers, but if users experience
+ * issues such as asymmetric behavior around the deadband or inability to
+ * saturate the controller in either direction, calibration is recommended.
+ * The calibration procedure can be found in the %Talon User Manual available
+ * from CTRE.
+ *
+ * \li 2.037ms = full "forward"
+ * \li 1.539ms = the "high end" of the deadband range
+ * \li 1.513ms = center of the deadband range (off)
+ * \li 1.487ms = the "low end" of the deadband range
+ * \li 0.989ms = full "reverse"
+ */
+class Talon : public PWMMotorController {
+ public:
+  /**
+   * Constructor for a %Talon (original or %Talon SR).
+   *
+   * @param channel The PWM channel number that the %Talon is attached to. 0-9
+   *                are on-board, 10-19 are on the MXP port
+   */
+  explicit Talon(int channel);
+
+  Talon(Talon&&) = default;
+  Talon& operator=(Talon&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/Victor.h b/wpilibc/src/main/native/include/frc/motorcontrol/Victor.h
new file mode 100644
index 0000000..9627925
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/Victor.h
@@ -0,0 +1,45 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Vex Robotics %Victor 888 Motor %Controller.
+ *
+ * The Vex Robotics %Victor 884 Motor %Controller can also be used with this
+ * class but may need to be calibrated per the Victor 884 user manual.
+ *
+ * Note that the %Victor uses the following bounds for PWM values.  These
+ * values were determined empirically and optimized for the %Victor 888. These
+ * values should work reasonably well for %Victor 884 controllers as well but
+ * if users experience issues such as asymmetric behavior around the deadband
+ * or inability to saturate the controller in either direction, calibration is
+ * recommended. The calibration procedure can be found in the %Victor 884 User
+ * Manual available from Vex.
+ *
+ * \li 2.027ms = full "forward"
+ * \li 1.525ms = the "high end" of the deadband range
+ * \li 1.507ms = center of the deadband range (off)
+ * \li 1.490ms = the "low end" of the deadband range
+ * \li 1.026ms = full "reverse"
+ */
+class Victor : public PWMMotorController {
+ public:
+  /**
+   * Constructor for a %Victor.
+   *
+   * @param channel The PWM channel number that the %Victor is attached to. 0-9
+   *                are on-board, 10-19 are on the MXP port
+   */
+  explicit Victor(int channel);
+
+  Victor(Victor&&) = default;
+  Victor& operator=(Victor&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/motorcontrol/VictorSP.h b/wpilibc/src/main/native/include/frc/motorcontrol/VictorSP.h
new file mode 100644
index 0000000..f599ff4
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/motorcontrol/VictorSP.h
@@ -0,0 +1,41 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/motorcontrol/PWMMotorController.h"
+
+namespace frc {
+
+/**
+ * Vex Robotics %Victor SP Motor %Controller.
+ *
+ * Note that the %Victor SP uses the following bounds for PWM values. These
+ * values should work reasonably well for most controllers, but if users
+ * experience issues such as asymmetric behavior around the deadband or
+ * inability to saturate the controller in either direction, calibration is
+ * recommended. The calibration procedure can be found in the %Victor SP User
+ * Manual available from Vex.
+ *
+ * \li 2.004ms = full "forward"
+ * \li 1.520ms = the "high end" of the deadband range
+ * \li 1.500ms = center of the deadband range (off)
+ * \li 1.480ms = the "low end" of the deadband range
+ * \li 0.997ms = full "reverse"
+ */
+class VictorSP : public PWMMotorController {
+ public:
+  /**
+   * Constructor for a %Victor SP.
+   *
+   * @param channel The PWM channel that the Victor SP is attached to. 0-9 are
+   *                on-board, 10-19 are on the MXP port
+   */
+  explicit VictorSP(int channel);
+
+  VictorSP(VictorSP&&) = default;
+  VictorSP& operator=(VictorSP&&) = default;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInLayouts.h b/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInLayouts.h
index 1d1ea5f..ca5e29f 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInLayouts.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInLayouts.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInWidgets.h b/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInWidgets.h
index df943b2..9ac315f 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInWidgets.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/BuiltInWidgets.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -163,8 +160,8 @@
    */
   kVoltageView,
   /**
-   * Displays a PowerDistributionPanel. <br>Supported types: <ul> <li>
-   * PowerDistributionPanel</li>
+   * Displays a PowerDistribution. <br>Supported types: <ul> <li>
+   * PowerDistribution</li>
    * </ul>
    * <br>Custom properties:
    * <table>
@@ -173,7 +170,7 @@
    * <td>Whether or not to display the voltage and current draw</td></tr>
    * </table>
    */
-  kPowerDistributionPanel,
+  kPowerDistribution,
   /**
    * Displays a SendableChooser with a dropdown combo box with a list of
    * options.
@@ -203,10 +200,10 @@
    */
   kEncoder,
   /**
-   * Displays a SpeedController.
-   * The speed controller will be controllable from the dashboard when test mode
+   * Displays a MotorController.
+   * The motor controller will be controllable from the dashboard when test mode
    * is enabled, but will otherwise be view-only. <br>Supported types: <ul>
-   * <li>PWMSpeedController</li>
+   * <li>PWMMotorController</li>
    * <li>DMC60</li>
    * <li>Jaguar</li>
    * <li>PWMTalonSRX</li>
@@ -216,7 +213,7 @@
    * <li>Talon</li>
    * <li>Victor</li>
    * <li>VictorSP</li>
-   * <li>SpeedControllerGroup</li>
+   * <li>MotorControllerGroup</li>
    * <li>Any custom subclass of {@code SpeedContorller}</li>
    * </ul>
    * <br>Custom properties:
@@ -226,7 +223,7 @@
    * <td>One of {@code ["HORIZONTAL", "VERTICAL"]}</td></tr>
    * </table>
    */
-  kSpeedController,
+  kMotorController,
   /**
    * Displays a command with a toggle button. Pressing the button will start the
    * command, and the button will automatically release when the command
@@ -283,7 +280,7 @@
    * <br>Custom properties:
    * <table>
    * <tr><th>Name</th><th>Type</th><th>Default Value</th><th>Notes</th></tr>
-   * <tr><td>Range</td><td>{@link Range}</td><td>k16G</td><td>The accelerometer
+   * <tr><td>Range</td><td>Range</td><td>k16G</td><td>The accelerometer
    * range</td></tr> <tr><td>Show value</td><td>Boolean</td><td>true</td>
    * <td>Show or hide the acceleration values</td></tr>
    * <tr><td>Precision</td><td>Number</td><td>2</td>
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ComplexWidget.h b/wpilibc/src/main/native/include/frc/shuffleboard/ComplexWidget.h
index 218ed2f..dc49d64 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ComplexWidget.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ComplexWidget.h
@@ -1,34 +1,35 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardWidget.h"
-#include "frc/smartdashboard/SendableBuilder.h"
-#include "frc/smartdashboard/SendableBuilderImpl.h"
+
+namespace wpi {
+class Sendable;
+class SendableBuilder;
+}  // namespace wpi
 
 namespace frc {
 
-class Sendable;
 class ShuffleboardContainer;
 
 /**
- * A Shuffleboard widget that handles a {@link Sendable} object such as a speed
+ * A Shuffleboard widget that handles a Sendable object such as a speed
  * controller or sensor.
  */
 class ComplexWidget final : public ShuffleboardWidget<ComplexWidget> {
  public:
-  ComplexWidget(ShuffleboardContainer& parent, const wpi::Twine& title,
-                Sendable& sendable);
+  ComplexWidget(ShuffleboardContainer& parent, std::string_view title,
+                wpi::Sendable& sendable);
+
+  ~ComplexWidget() override;
 
   void EnableIfActuator() override;
 
@@ -38,9 +39,8 @@
                  std::shared_ptr<nt::NetworkTable> metaTable) override;
 
  private:
-  Sendable& m_sendable;
-  SendableBuilderImpl m_builder;
-  bool m_builderInit = false;
+  wpi::Sendable& m_sendable;
+  std::unique_ptr<wpi::SendableBuilder> m_builder;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/LayoutType.h b/wpilibc/src/main/native/include/frc/shuffleboard/LayoutType.h
index 00a5e36..5fa5ca4 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/LayoutType.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/LayoutType.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -28,7 +25,7 @@
    * Gets the string type of the layout as defined by that layout in
    * Shuffleboard.
    */
-  wpi::StringRef GetLayoutName() const;
+  std::string_view GetLayoutName() const;
 
  private:
   const char* m_layoutName;
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/RecordingController.h b/wpilibc/src/main/native/include/frc/shuffleboard/RecordingController.h
index dacbdb4..83b23a4 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/RecordingController.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/RecordingController.h
@@ -1,24 +1,20 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableInstance.h>
 #include <wpi/SmallVector.h>
-#include <wpi/StringRef.h>
 
 #include "frc/shuffleboard/ShuffleboardEventImportance.h"
 
-namespace frc {
-namespace detail {
+namespace frc::detail {
 
 class RecordingController final {
  public:
@@ -27,10 +23,10 @@
 
   void StartRecording();
   void StopRecording();
-  void SetRecordingFileNameFormat(wpi::StringRef format);
+  void SetRecordingFileNameFormat(std::string_view format);
   void ClearRecordingFileNameFormat();
 
-  void AddEventMarker(wpi::StringRef name, wpi::StringRef description,
+  void AddEventMarker(std::string_view name, std::string_view description,
                       ShuffleboardEventImportance importance);
 
  private:
@@ -39,5 +35,4 @@
   std::shared_ptr<nt::NetworkTable> m_eventsTable;
 };
 
-}  // namespace detail
-}  // namespace frc
+}  // namespace frc::detail
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/SendableCameraWrapper.h b/wpilibc/src/main/native/include/frc/shuffleboard/SendableCameraWrapper.h
index 5610cf8..e7c9a81 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/SendableCameraWrapper.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/SendableCameraWrapper.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -17,12 +14,12 @@
 namespace cs {
 class VideoSource;
 }  // namespace cs
-typedef int CS_Handle;
-typedef CS_Handle CS_Source;
+using CS_Handle = int;        // NOLINT
+using CS_Source = CS_Handle;  // NOLINT
 #endif
 
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/Sendable.h>
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 
@@ -32,14 +29,15 @@
 constexpr const char* kProtocol = "camera_server://";
 std::shared_ptr<SendableCameraWrapper>& GetSendableCameraWrapper(
     CS_Source source);
-void AddToSendableRegistry(Sendable* sendable, std::string name);
+void AddToSendableRegistry(wpi::Sendable* sendable, std::string name);
 }  // namespace detail
 
 /**
  * A wrapper to make video sources sendable and usable from Shuffleboard.
  */
-class SendableCameraWrapper : public Sendable,
-                              public SendableHelper<SendableCameraWrapper> {
+class SendableCameraWrapper
+    : public wpi::Sendable,
+      public wpi::SendableHelper<SendableCameraWrapper> {
  private:
   struct private_init {};
 
@@ -63,7 +61,7 @@
   static SendableCameraWrapper& Wrap(const cs::VideoSource& source);
   static SendableCameraWrapper& Wrap(CS_Source source);
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(wpi::SendableBuilder& builder) override;
 
  private:
   std::string m_uri;
@@ -86,8 +84,9 @@
 
 inline SendableCameraWrapper& SendableCameraWrapper::Wrap(CS_Source source) {
   auto& wrapper = detail::GetSendableCameraWrapper(source);
-  if (!wrapper)
+  if (!wrapper) {
     wrapper = std::make_shared<SendableCameraWrapper>(source, private_init{});
+  }
   return *wrapper;
 }
 #endif
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h b/wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h
index e49d1c3..252d74a 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/Shuffleboard.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 #include "frc/shuffleboard/RecordingController.h"
 #include "frc/shuffleboard/ShuffleboardEventImportance.h"
@@ -80,7 +77,7 @@
    * @param title the title of the tab
    * @return the tab with the given title
    */
-  static ShuffleboardTab& GetTab(wpi::StringRef title);
+  static ShuffleboardTab& GetTab(std::string_view title);
 
   /**
    * Selects the tab in the dashboard with the given index in the range
@@ -96,10 +93,10 @@
    *
    * @param title the title of the tab to select
    */
-  static void SelectTab(wpi::StringRef title);
+  static void SelectTab(std::string_view title);
 
   /**
-   * Enables user control of widgets containing actuators: speed controllers,
+   * Enables user control of widgets containing actuators: motor controllers,
    * relays, etc. This should only be used when the robot is in test mode.
    * IterativeRobotBase and SampleRobot are both configured to call this method
    * when entering test mode; most users should not need to use this method
@@ -144,13 +141,13 @@
    *
    * @param format the format for the
    */
-  static void SetRecordingFileNameFormat(wpi::StringRef format);
+  static void SetRecordingFileNameFormat(std::string_view format);
 
   /**
    * Clears the custom name format for recording files. New recordings will use
    * the default format.
    *
-   * @see #setRecordingFileNameFormat(String)
+   * @see SetRecordingFileNameFormat(std::string_view)
    */
   static void ClearRecordingFileNameFormat();
 
@@ -166,7 +163,8 @@
    * @param description a description of the event
    * @param importance  the importance of the event
    */
-  static void AddEventMarker(wpi::StringRef name, wpi::StringRef description,
+  static void AddEventMarker(std::string_view name,
+                             std::string_view description,
                              ShuffleboardEventImportance importance);
 
   /**
@@ -180,7 +178,7 @@
    * @param name        the name of the event
    * @param importance  the importance of the event
    */
-  static void AddEventMarker(wpi::StringRef name,
+  static void AddEventMarker(std::string_view name,
                              ShuffleboardEventImportance importance);
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.h
index d6b4bc4..24f65a3 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.h
@@ -1,19 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableValue.h>
 #include <wpi/StringMap.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardComponentBase.h"
 
@@ -29,10 +26,8 @@
 template <typename Derived>
 class ShuffleboardComponent : public ShuffleboardComponentBase {
  public:
-  ShuffleboardComponent(ShuffleboardContainer& parent, const wpi::Twine& title,
-                        const wpi::Twine& type = "");
-
-  virtual ~ShuffleboardComponent() = default;
+  ShuffleboardComponent(ShuffleboardContainer& parent, std::string_view title,
+                        std::string_view type = "");
 
   /**
    * Sets custom properties for this component. Property names are
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.inc b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.inc
index f75fb0d..9750d4a 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.inc
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponent.inc
@@ -1,21 +1,21 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
+
+#include "frc/shuffleboard/ShuffleboardComponent.h"
 
 namespace frc {
 
 template <typename Derived>
 ShuffleboardComponent<Derived>::ShuffleboardComponent(
-    ShuffleboardContainer& parent, const wpi::Twine& title,
-    const wpi::Twine& type)
+    ShuffleboardContainer& parent, std::string_view title,
+    std::string_view type)
     : ShuffleboardValue(title),
       ShuffleboardComponentBase(parent, title, type) {}
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponentBase.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponentBase.h
index c63e517..d33a234 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponentBase.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardComponentBase.h
@@ -1,19 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableValue.h>
 #include <wpi/StringMap.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardValue.h"
 
@@ -27,12 +24,9 @@
 class ShuffleboardComponentBase : public virtual ShuffleboardValue {
  public:
   ShuffleboardComponentBase(ShuffleboardContainer& parent,
-                            const wpi::Twine& title,
-                            const wpi::Twine& type = "");
+                            std::string_view title, std::string_view type = "");
 
-  virtual ~ShuffleboardComponentBase() = default;
-
-  void SetType(const wpi::Twine& type);
+  void SetType(std::string_view type);
 
   void BuildMetadata(std::shared_ptr<nt::NetworkTable> metaTable);
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardContainer.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardContainer.h
index 7b8b49d..db58a21 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardContainer.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardContainer.h
@@ -1,26 +1,21 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
 #include <memory>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableValue.h>
-#include <wpi/ArrayRef.h>
 #include <wpi/SmallSet.h>
 #include <wpi/StringMap.h>
-#include <wpi/Twine.h>
+#include <wpi/span.h>
 
-#include "frc/ErrorBase.h"
-#include "frc/WPIErrors.h"
 #include "frc/shuffleboard/BuiltInLayouts.h"
 #include "frc/shuffleboard/LayoutType.h"
 #include "frc/shuffleboard/ShuffleboardComponentBase.h"
@@ -31,24 +26,26 @@
 class VideoSource;
 }  // namespace cs
 
+namespace wpi {
+class Sendable;
+}  // namespace wpi
+
 namespace frc {
 
 class ComplexWidget;
-class Sendable;
 class ShuffleboardLayout;
 class SimpleWidget;
 
 /**
  * Common interface for objects that can contain shuffleboard components.
  */
-class ShuffleboardContainer : public virtual ShuffleboardValue,
-                              public ErrorBase {
+class ShuffleboardContainer : public virtual ShuffleboardValue {
  public:
-  explicit ShuffleboardContainer(const wpi::Twine& title);
+  explicit ShuffleboardContainer(std::string_view title);
 
   ShuffleboardContainer(ShuffleboardContainer&& rhs) = default;
 
-  virtual ~ShuffleboardContainer() = default;
+  ~ShuffleboardContainer() override = default;
 
   /**
    * Gets the components that are direct children of this container.
@@ -60,38 +57,36 @@
    * Gets the layout with the given type and title, creating it if it does not
    * already exist at the time this method is called.
    *
-   * @param title      the title of the layout
-   * @param layoutType the type of the layout, eg "List" or "Grid"
+   * @param title the title of the layout
+   * @param type  the type of the layout, eg "List" or "Grid"
    * @return the layout
    */
-  ShuffleboardLayout& GetLayout(const wpi::Twine& title, BuiltInLayouts type);
+  ShuffleboardLayout& GetLayout(std::string_view title, BuiltInLayouts type);
 
   /**
    * Gets the layout with the given type and title, creating it if it does not
    * already exist at the time this method is called.
    *
-   * @param title      the title of the layout
-   * @param layoutType the type of the layout, eg "List" or "Grid"
+   * @param title the title of the layout
+   * @param type  the type of the layout, eg "List" or "Grid"
    * @return the layout
    */
-  ShuffleboardLayout& GetLayout(const wpi::Twine& title,
-                                const LayoutType& type);
+  ShuffleboardLayout& GetLayout(std::string_view title, const LayoutType& type);
 
   /**
    * Gets the layout with the given type and title, creating it if it does not
    * already exist at the time this method is called. Note: this method should
    * only be used to use a layout type that is not already built into
    * Shuffleboard. To use a layout built into Shuffleboard, use
-   * {@link #GetLayout(String, LayoutType)} and the layouts in {@link
-   * BuiltInLayouts}.
+   * GetLayout(std::string_view, const LayoutType&) and the layouts in
+   * BuiltInLayouts.
    *
    * @param title the title of the layout
    * @param type  the type of the layout, eg "List Layout" or "Grid Layout"
    * @return the layout
-   * @see #GetLayout(String, LayoutType)
+   * @see GetLayout(std::string_view, const LayoutType&)
    */
-  ShuffleboardLayout& GetLayout(const wpi::Twine& title,
-                                const wpi::Twine& type);
+  ShuffleboardLayout& GetLayout(std::string_view title, std::string_view type);
 
   /**
    * Gets the already-defined layout in this container with the given title.
@@ -108,7 +103,7 @@
    * @return the layout with the given title
    * @throws if no layout has yet been defined with the given title
    */
-  ShuffleboardLayout& GetLayout(const wpi::Twine& title);
+  ShuffleboardLayout& GetLayout(std::string_view title);
 
   /**
    * Adds a widget to this container to display the given sendable.
@@ -119,7 +114,7 @@
    * @throws IllegalArgumentException if a widget already exists in this
    * container with the given title
    */
-  ComplexWidget& Add(const wpi::Twine& title, Sendable& sendable);
+  ComplexWidget& Add(std::string_view title, wpi::Sendable& sendable);
 
   /**
    * Adds a widget to this container to display the given video stream.
@@ -130,7 +125,7 @@
    * @throws IllegalArgumentException if a widget already exists in this
    * container with the given title
    */
-  ComplexWidget& Add(const wpi::Twine& title, const cs::VideoSource& video);
+  ComplexWidget& Add(std::string_view title, const cs::VideoSource& video);
 
   /**
    * Adds a widget to this container to display the given sendable.
@@ -141,7 +136,7 @@
    * container with the given title, or if the sendable's name has not been
    * specified
    */
-  ComplexWidget& Add(Sendable& sendable);
+  ComplexWidget& Add(wpi::Sendable& sendable);
 
   /**
    * Adds a widget to this container to display the given video stream.
@@ -161,9 +156,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, std::shared_ptr<nt::Value>)
+   *      Add(std::string_view title, std::shared_ptr<nt::Value> defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title,
+  SimpleWidget& Add(std::string_view title,
                     std::shared_ptr<nt::Value> defaultValue);
 
   /**
@@ -174,9 +170,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, bool)
+   *      Add(std::string_view title, bool defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, bool defaultValue);
+  SimpleWidget& Add(std::string_view title, bool defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -186,9 +183,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, double)
+   *      Add(std::string_view title, double defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, double defaultValue);
+  SimpleWidget& Add(std::string_view title, double defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -198,9 +196,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, int)
+   *      Add(std::string_view title, int defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, int defaultValue);
+  SimpleWidget& Add(std::string_view title, int defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -210,9 +209,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, std::string_view)
+   *      Add(std::string_view title, std::string_view defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, const wpi::Twine& defaultValue);
+  SimpleWidget& Add(std::string_view title, std::string_view defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -222,9 +222,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, const char*)
+   *      Add(std::string_view title, const char* defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, const char* defaultValue);
+  SimpleWidget& Add(std::string_view title, const char* defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -234,9 +235,10 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, wpi::span<const bool>)
+   *      Add(std::string_view title, wpi::span<const bool> defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title, wpi::ArrayRef<bool> defaultValue);
+  SimpleWidget& Add(std::string_view title, wpi::span<const bool> defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -246,10 +248,11 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, wpi::span<const double>)
+   *      Add(std::string_view title, wpi::span<const double> defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title,
-                    wpi::ArrayRef<double> defaultValue);
+  SimpleWidget& Add(std::string_view title,
+                    wpi::span<const double> defaultValue);
 
   /**
    * Adds a widget to this container to display the given data.
@@ -259,10 +262,11 @@
    * @return a widget to display the sendable data
    * @throws IllegalArgumentException if a widget already exists in this
    *         container with the given title
-   * @see #addPersistent(String, Object) add(String title, Object defaultValue)
+   * @see AddPersistent(std::string_view, wpi::span<const std::string>)
+   *      Add(std::string_view title, wpi::span<const std::string> defaultValue)
    */
-  SimpleWidget& Add(const wpi::Twine& title,
-                    wpi::ArrayRef<std::string> defaultValue);
+  SimpleWidget& Add(std::string_view title,
+                    wpi::span<const std::string> defaultValue);
 
   /**
    * Adds a widget to this container. The widget will display the data provided
@@ -271,11 +275,11 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
   SuppliedValueWidget<std::string>& AddString(
-      const wpi::Twine& title, std::function<std::string()> supplier);
+      std::string_view title, std::function<std::string()> supplier);
 
   /**
    * Adds a widget to this container. The widget will display the data provided
@@ -284,10 +288,10 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
-  SuppliedValueWidget<double>& AddNumber(const wpi::Twine& title,
+  SuppliedValueWidget<double>& AddNumber(std::string_view title,
                                          std::function<double()> supplier);
 
   /**
@@ -297,10 +301,10 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
-  SuppliedValueWidget<bool>& AddBoolean(const wpi::Twine& title,
+  SuppliedValueWidget<bool>& AddBoolean(std::string_view title,
                                         std::function<bool()> supplier);
 
   /**
@@ -310,11 +314,11 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
   SuppliedValueWidget<std::vector<std::string>>& AddStringArray(
-      const wpi::Twine& title,
+      std::string_view title,
       std::function<std::vector<std::string>()> supplier);
 
   /**
@@ -324,11 +328,11 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
   SuppliedValueWidget<std::vector<double>>& AddNumberArray(
-      const wpi::Twine& title, std::function<std::vector<double>()> supplier);
+      std::string_view title, std::function<std::vector<double>()> supplier);
 
   /**
    * Adds a widget to this container. The widget will display the data provided
@@ -337,11 +341,11 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
   SuppliedValueWidget<std::vector<int>>& AddBooleanArray(
-      const wpi::Twine& title, std::function<std::vector<int>()> supplier);
+      std::string_view title, std::function<std::vector<int>()> supplier);
 
   /**
    * Adds a widget to this container. The widget will display the data provided
@@ -350,128 +354,136 @@
    * supplier.
    *
    * @param title the title of the widget
-   * @param valueSupplier the supplier for values
+   * @param supplier the supplier for values
    * @return a widget to display data
    */
-  SuppliedValueWidget<wpi::StringRef>& AddRaw(
-      const wpi::Twine& title, std::function<wpi::StringRef()> supplier);
+  SuppliedValueWidget<std::string_view>& AddRaw(
+      std::string_view title, std::function<std::string_view()> supplier);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, std::shared_ptr<nt::Value>), the value in the
+   * widget will be saved on the robot and will be used when the robot program
+   * next starts rather than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(stdd::string_view, std::shared_ptr<nt::Value>)
+   *      Add(std::string_view title, std::shared_ptr<nt::Value> defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title,
+  SimpleWidget& AddPersistent(std::string_view title,
                               std::shared_ptr<nt::Value> defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
+   * Unlike Add(std::string_view, bool), the value in the widget will be saved
    * on the robot and will be used when the robot program next starts rather
    * than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, bool)
+   *      Add(std::string_view title, bool defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title, bool defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title, bool defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
+   * Unlike Add(std::string_view, double), the value in the widget will be saved
    * on the robot and will be used when the robot program next starts rather
    * than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, double)
+   *      Add(std::string_view title, double defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title, double defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title, double defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, int), the value in the widget will be saved on
+   * the robot and will be used when the robot program next starts rather than
+   * {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std:string_view, int)
+   *      Add(std::string_view title, int defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title, int defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title, int defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, std::string_view), the value in the widget
+   * will be saved on the robot and will be used when the robot program next
+   * starts rather than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, std::string_view)
+   *      Add(std::string_view title, std::string_view defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title,
-                              const wpi::Twine& defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title,
+                              std::string_view defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, wpi::span<const bool>), the value in the
+   * widget will be saved on the robot and will be used when the robot program
+   * next starts rather than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, wpi::span<const bool>)
+   *      Add(std::string_view title, wpi::span<const bool> defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title,
-                              wpi::ArrayRef<bool> defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title,
+                              wpi::span<const bool> defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, wpi::span<const double>), the value in the
+   * widget will be saved on the robot and will be used when the robot program
+   * next starts rather than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, wpi::span<const double>)
+   *      Add(std::string_view title, wpi::span<const double> defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title,
-                              wpi::ArrayRef<double> defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title,
+                              wpi::span<const double> defaultValue);
 
   /**
    * Adds a widget to this container to display a simple piece of data.
    *
-   * Unlike {@link #add(String, Object)}, the value in the widget will be saved
-   * on the robot and will be used when the robot program next starts rather
-   * than {@code defaultValue}.
+   * Unlike Add(std::string_view, wpi::span<const std::string>), the value in
+   * the widget will be saved on the robot and will be used when the robot
+   * program next starts rather than {@code defaultValue}.
    *
    * @param title the title of the widget
    * @param defaultValue the default value of the widget
    * @return a widget to display the sendable data
-   * @see #add(String, Object) add(String title, Object defaultValue)
+   * @see Add(std::string_view, wpi::span<const std::string>)
+   *      Add(std::string_view title, wpi::span<const std::string> defaultValue)
    */
-  SimpleWidget& AddPersistent(const wpi::Twine& title,
-                              wpi::ArrayRef<std::string> defaultValue);
+  SimpleWidget& AddPersistent(std::string_view title,
+                              wpi::span<const std::string> defaultValue);
 
   void EnableIfActuator() override;
 
@@ -490,7 +502,7 @@
    *
    * @return True if title isn't in use; false otherwise.
    */
-  void CheckTitle(const wpi::Twine& title);
+  void CheckTitle(std::string_view title);
 
   friend class SimpleWidget;
 };
@@ -511,7 +523,7 @@
 }
 
 inline frc::ComplexWidget& frc::ShuffleboardContainer::Add(
-    const wpi::Twine& title, const cs::VideoSource& video) {
+    std::string_view title, const cs::VideoSource& video) {
   return Add(title, frc::SendableCameraWrapper::Wrap(video));
 }
 #endif
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardEventImportance.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardEventImportance.h
index 57e4743..1fa9c91 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardEventImportance.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardEventImportance.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -17,7 +14,7 @@
 
 enum ShuffleboardEventImportance { kTrivial, kLow, kNormal, kHigh, kCritical };
 
-inline wpi::StringRef ShuffleboardEventImportanceName(
+inline std::string_view ShuffleboardEventImportanceName(
     ShuffleboardEventImportance importance) {
   switch (importance) {
     case kTrivial:
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h
index 2be9859..2885af7 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardInstance.h
@@ -1,19 +1,16 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include "frc/shuffleboard/ShuffleboardRoot.h"
 #include "frc/shuffleboard/ShuffleboardTab.h"
 
-namespace frc {
-namespace detail {
+namespace frc::detail {
 
 class ShuffleboardInstance final : public ShuffleboardRoot {
  public:
@@ -23,7 +20,7 @@
   ShuffleboardInstance(ShuffleboardInstance&&) = default;
   ShuffleboardInstance& operator=(ShuffleboardInstance&&) = default;
 
-  frc::ShuffleboardTab& GetTab(wpi::StringRef title) override;
+  frc::ShuffleboardTab& GetTab(std::string_view title) override;
 
   void Update() override;
 
@@ -33,12 +30,11 @@
 
   void SelectTab(int index) override;
 
-  void SelectTab(wpi::StringRef) override;
+  void SelectTab(std::string_view) override;
 
  private:
   struct Impl;
   std::unique_ptr<Impl> m_impl;
 };
 
-}  // namespace detail
-}  // namespace frc
+}  // namespace frc::detail
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardLayout.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardLayout.h
index effa3da..fe9e102 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardLayout.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardLayout.h
@@ -1,16 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardComponent.h"
 #include "frc/shuffleboard/ShuffleboardContainer.h"
@@ -29,8 +26,8 @@
 class ShuffleboardLayout : public ShuffleboardComponent<ShuffleboardLayout>,
                            public ShuffleboardContainer {
  public:
-  ShuffleboardLayout(ShuffleboardContainer& parent, const wpi::Twine& name,
-                     const wpi::Twine& type);
+  ShuffleboardLayout(ShuffleboardContainer& parent, std::string_view name,
+                     std::string_view type);
 
   void BuildInto(std::shared_ptr<nt::NetworkTable> parentTable,
                  std::shared_ptr<nt::NetworkTable> metaTable) override;
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h
index 0c50545..1e766a8 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -28,7 +25,7 @@
    * @param title the title of the tab
    * @return the tab with the given title
    */
-  virtual ShuffleboardTab& GetTab(wpi::StringRef title) = 0;
+  virtual ShuffleboardTab& GetTab(std::string_view title) = 0;
 
   /**
    * Updates all tabs.
@@ -60,7 +57,7 @@
    *
    * @param title the title of the tab to select
    */
-  virtual void SelectTab(wpi::StringRef title) = 0;
+  virtual void SelectTab(std::string_view title) = 0;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardTab.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardTab.h
index 75896ae..8864cdb 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardTab.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardTab.h
@@ -1,16 +1,13 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
-#include <wpi/StringRef.h>
 
 #include "frc/shuffleboard/ShuffleboardContainer.h"
 
@@ -20,14 +17,15 @@
 
 /**
  * Represents a tab in the Shuffleboard dashboard. Widgets can be added to the
- * tab with {@link #add(Sendable)}, {@link #add(String, Object)}, and
- * {@link #add(String, Sendable)}. Widgets can also be added to layouts with
- * {@link #getLayout(String, String)}; layouts can be nested arbitrarily deep
- * (note that too many levels may make deeper components unusable).
+ * tab with Add(Sendable), Add(std::string_view, Object), and
+ * Add(String, Sendable). Widgets can also be added to layouts with
+ * GetLayout(std::string_view, std::string_view); layouts can be nested
+ * arbitrarily deep (note that too many levels may make deeper components
+ * unusable).
  */
 class ShuffleboardTab final : public ShuffleboardContainer {
  public:
-  ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title);
+  ShuffleboardTab(ShuffleboardRoot& root, std::string_view title);
 
   ShuffleboardRoot& GetRoot();
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardValue.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardValue.h
index 4a88cc1..4b7ccd4 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardValue.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardValue.h
@@ -1,34 +1,30 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
-#include <wpi/SmallVector.h>
-#include <wpi/StringRef.h>
 
 namespace frc {
 
 class ShuffleboardValue {
  public:
-  explicit ShuffleboardValue(const wpi::Twine& title) {
-    wpi::SmallVector<char, 16> storage;
-    m_title = title.toStringRef(storage);
-  }
+  explicit ShuffleboardValue(std::string_view title) : m_title(title) {}
 
   virtual ~ShuffleboardValue() = default;
 
+  ShuffleboardValue(const ShuffleboardValue&) = delete;
+  ShuffleboardValue& operator=(const ShuffleboardValue&) = delete;
+
   /**
    * Gets the title of this Shuffleboard value.
    */
-  wpi::StringRef GetTitle() const { return m_title; }
+  const std::string& GetTitle() const { return m_title; }
 
   /**
    * Builds the entries for this value.
@@ -51,7 +47,7 @@
    *
    * This method is package-private to prevent users from enabling control
    * themselves. Has no effect if the sendable is not marked as an actuator with
-   * {@link SendableBuilder#setActuator}.
+   * SendableBuilder::SetActuator().
    */
   virtual void EnableIfActuator() {}
 
@@ -60,7 +56,7 @@
    *
    * This method is package-private to prevent users from enabling control
    * themselves. Has no effect if the sendable is not marked as an actuator with
-   * {@link SendableBuilder#setActuator}.
+   * SendableBuilder::SetActuator().
    */
   virtual void DisableIfActuator() {}
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardWidget.h b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardWidget.h
index 729da40..ce01367 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardWidget.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardWidget.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/Twine.h>
+#include <string_view>
 
 #include "frc/shuffleboard/BuiltInWidgets.h"
 #include "frc/shuffleboard/ShuffleboardComponent.h"
@@ -31,7 +28,7 @@
 template <typename Derived>
 class ShuffleboardWidget : public ShuffleboardComponent<Derived> {
  public:
-  ShuffleboardWidget(ShuffleboardContainer& parent, const wpi::Twine& title)
+  ShuffleboardWidget(ShuffleboardContainer& parent, std::string_view title)
       : ShuffleboardValue(title),
         ShuffleboardComponent<Derived>(parent, title) {}
 
@@ -63,13 +60,12 @@
    * widget type will be used. This method should only be used to use a widget
    * that does not come built into Shuffleboard (i.e. one that comes with a
    * custom or third-party plugin). To use a widget that is built into
-   * Shuffleboard, use {@link #withWidget(WidgetType)} and {@link
-   * BuiltInWidgets}.
+   * Shuffleboard, use WithWidget(WidgetType) and BuiltInWidgets.
    *
    * @param widgetType the type of the widget used to display the data
    * @return this widget object
    */
-  Derived& WithWidget(const wpi::Twine& widgetType) {
+  Derived& WithWidget(std::string_view widgetType) {
     this->SetType(widgetType);
     return *static_cast<Derived*>(this);
   }
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/SimpleWidget.h b/wpilibc/src/main/native/include/frc/shuffleboard/SimpleWidget.h
index 973f8cb..746b7d6 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/SimpleWidget.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/SimpleWidget.h
@@ -1,17 +1,14 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableEntry.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardWidget.h"
 
@@ -25,7 +22,7 @@
  */
 class SimpleWidget final : public ShuffleboardWidget<SimpleWidget> {
  public:
-  SimpleWidget(ShuffleboardContainer& parent, const wpi::Twine& title);
+  SimpleWidget(ShuffleboardContainer& parent, std::string_view title);
 
   /**
    * Gets the NetworkTable entry that contains the data for this widget.
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/SuppliedValueWidget.h b/wpilibc/src/main/native/include/frc/shuffleboard/SuppliedValueWidget.h
index c806db4..a2b042e 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/SuppliedValueWidget.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/SuppliedValueWidget.h
@@ -1,34 +1,32 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
 #include <memory>
+#include <string_view>
 
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableEntry.h>
-#include <wpi/Twine.h>
 
 #include "frc/shuffleboard/ShuffleboardComponent.h"
 #include "frc/shuffleboard/ShuffleboardComponent.inc"
 #include "frc/shuffleboard/ShuffleboardComponentBase.h"
-#include "frc/shuffleboard/ShuffleboardContainer.h"
 #include "frc/shuffleboard/ShuffleboardWidget.h"
 
 namespace frc {
+class ShuffleboardContainer;
+
 template <typename T>
-class SuppliedValueWidget : public ShuffleboardWidget<SuppliedValueWidget<T> > {
+class SuppliedValueWidget : public ShuffleboardWidget<SuppliedValueWidget<T>> {
  public:
-  SuppliedValueWidget(ShuffleboardContainer& parent, const wpi::Twine& title,
+  SuppliedValueWidget(ShuffleboardContainer& parent, std::string_view title,
                       std::function<T()> supplier,
                       std::function<void(nt::NetworkTableEntry, T)> setter)
       : ShuffleboardValue(title),
-        ShuffleboardWidget<SuppliedValueWidget<T> >(parent, title),
+        ShuffleboardWidget<SuppliedValueWidget<T>>(parent, title),
         m_supplier(supplier),
         m_setter(setter) {}
 
diff --git a/wpilibc/src/main/native/include/frc/shuffleboard/WidgetType.h b/wpilibc/src/main/native/include/frc/shuffleboard/WidgetType.h
index ff92fe7..13805bb 100644
--- a/wpilibc/src/main/native/include/frc/shuffleboard/WidgetType.h
+++ b/wpilibc/src/main/native/include/frc/shuffleboard/WidgetType.h
@@ -1,13 +1,10 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
-#include <wpi/StringRef.h>
+#include <string_view>
 
 namespace frc {
 
@@ -28,7 +25,7 @@
    * Gets the string type of the widget as defined by that widget in
    * Shuffleboard.
    */
-  wpi::StringRef GetWidgetName() const;
+  std::string_view GetWidgetName() const;
 
  private:
   const char* m_widgetName;
diff --git a/wpilibc/src/main/native/include/frc/simulation/ADXL345Sim.h b/wpilibc/src/main/native/include/frc/simulation/ADXL345Sim.h
new file mode 100644
index 0000000..af96b39
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/ADXL345Sim.h
@@ -0,0 +1,63 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <hal/SimDevice.h>
+
+namespace frc {
+
+class ADXL345_SPI;
+class ADXL345_I2C;
+
+namespace sim {
+
+/**
+ * Class to control a simulated ADXRS450 gyroscope.
+ */
+class ADXL345Sim {
+ public:
+  /**
+   * Constructs from a ADXL345_I2C object.
+   *
+   * @param accel ADXL345 accel to simulate
+   */
+  explicit ADXL345Sim(const ADXL345_I2C& accel);
+
+  /**
+   * Constructs from a ADXL345_SPI object.
+   *
+   * @param accel ADXL345 accel to simulate
+   */
+  explicit ADXL345Sim(const ADXL345_SPI& accel);
+
+  /**
+   * Sets the X acceleration.
+   *
+   * @param accel The X acceleration.
+   */
+  void SetX(double accel);
+
+  /**
+   * Sets the Y acceleration.
+   *
+   * @param accel The Y acceleration.
+   */
+  void SetY(double accel);
+
+  /**
+   * Sets the Z acceleration.
+   *
+   * @param accel The Z acceleration.
+   */
+  void SetZ(double accel);
+
+ private:
+  hal::SimDouble m_simX;
+  hal::SimDouble m_simY;
+  hal::SimDouble m_simZ;
+};
+
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/ADXL362Sim.h b/wpilibc/src/main/native/include/frc/simulation/ADXL362Sim.h
new file mode 100644
index 0000000..269732b
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/ADXL362Sim.h
@@ -0,0 +1,55 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <hal/SimDevice.h>
+
+namespace frc {
+
+class ADXL362;
+
+namespace sim {
+
+/**
+ * Class to control a simulated ADXRS450 gyroscope.
+ */
+class ADXL362Sim {
+ public:
+  /**
+   * Constructs from a ADXL362 object.
+   *
+   * @param accel ADXL362 accel to simulate
+   */
+  explicit ADXL362Sim(const ADXL362& accel);
+
+  /**
+   * Sets the X acceleration.
+   *
+   * @param accel The X acceleration.
+   */
+  void SetX(double accel);
+
+  /**
+   * Sets the Y acceleration.
+   *
+   * @param accel The Y acceleration.
+   */
+  void SetY(double accel);
+
+  /**
+   * Sets the Z acceleration.
+   *
+   * @param accel The Z acceleration.
+   */
+  void SetZ(double accel);
+
+ private:
+  hal::SimDouble m_simX;
+  hal::SimDouble m_simY;
+  hal::SimDouble m_simZ;
+};
+
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/ADXRS450_GyroSim.h b/wpilibc/src/main/native/include/frc/simulation/ADXRS450_GyroSim.h
index 1d2d2c3..4cb4737 100644
--- a/wpilibc/src/main/native/include/frc/simulation/ADXRS450_GyroSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/ADXRS450_GyroSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/simulation/AddressableLEDSim.h b/wpilibc/src/main/native/include/frc/simulation/AddressableLEDSim.h
index 0c578f4..4533086 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AddressableLEDSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AddressableLEDSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -55,39 +52,131 @@
    */
   static AddressableLEDSim CreateForIndex(int index);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback on the Initialized property.
+   *
+   * @param callback the callback that will be called whenever the Initialized
+   *                 property is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object storing this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Change the Initialized value of the LED strip.
+   *
+   * @param initialized the new value
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterOutputPortCallback(
+  /**
+   * Register a callback on the output port.
+   *
+   * @param callback the callback that will be called whenever the output port
+   *                 is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterOutputPortCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the output port.
+   *
+   * @return the output port
+   */
   int GetOutputPort() const;
 
+  /**
+   * Change the output port.
+   *
+   * @param outputPort the new output port
+   */
   void SetOutputPort(int outputPort);
 
-  std::unique_ptr<CallbackStore> RegisterLengthCallback(NotifyCallback callback,
-                                                        bool initialNotify);
-
-  int GetLength() const;
-
-  void SetLength(int length);
-
-  std::unique_ptr<CallbackStore> RegisterRunningCallback(
+  /**
+   * Register a callback on the length.
+   *
+   * @param callback the callback that will be called whenever the length is
+   *                 changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterLengthCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the length of the LED strip.
+   *
+   * @return the length
+   */
+  int GetLength() const;
+
+  /**
+   * Change the length of the LED strip.
+   *
+   * @param length the new value
+   */
+  void SetLength(int length);
+
+  /**
+   * Register a callback on whether the LEDs are running.
+   *
+   * @param callback the callback that will be called whenever the LED state is
+   *                 changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterRunningCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if the LEDs are running.
+   *
+   * @return true if they are
+   */
   int GetRunning() const;
 
+  /**
+   * Change whether the LEDs are active.
+   *
+   * @param running the new value
+   */
   void SetRunning(bool running);
 
-  std::unique_ptr<CallbackStore> RegisterDataCallback(NotifyCallback callback,
-                                                      bool initialNotify);
+  /**
+   * Register a callback on the LED data.
+   *
+   * @param callback the callback that will be called whenever the LED data is
+   *                 changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterDataCallback(
+      ConstBufferCallback callback, bool initialNotify);
 
+  /**
+   * Get the LED data.
+   *
+   * @param data output parameter to fill with LED data
+   * @return the length of the LED data
+   */
   int GetData(struct HAL_AddressableLEDData* data) const;
 
+  /**
+   * Change the LED data.
+   *
+   * @param data the new data
+   * @param length the length of the LED data
+   */
   void SetData(struct HAL_AddressableLEDData* data, int length);
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/AnalogEncoderSim.h b/wpilibc/src/main/native/include/frc/simulation/AnalogEncoderSim.h
index aef979a..6d76326 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AnalogEncoderSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AnalogEncoderSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -31,7 +28,7 @@
   explicit AnalogEncoderSim(const AnalogEncoder& encoder);
 
   /**
-   * Set the position using an {@link Rotation2d}.
+   * Set the position using an Rotation2d.
    *
    * @param angle The angle.
    */
@@ -50,7 +47,7 @@
   units::turn_t GetTurns();
 
   /**
-   * Get the position as a {@link Rotation2d}.
+   * Get the position as a Rotation2d.
    */
   Rotation2d GetPosition();
 
diff --git a/wpilibc/src/main/native/include/frc/simulation/AnalogGyroSim.h b/wpilibc/src/main/native/include/frc/simulation/AnalogGyroSim.h
index 685e3ed..faa11d7 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AnalogGyroSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AnalogGyroSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,27 +33,82 @@
    */
   explicit AnalogGyroSim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterAngleCallback(NotifyCallback callback,
-                                                       bool initialNotify);
-
-  double GetAngle() const;
-
-  void SetAngle(double angle);
-
-  std::unique_ptr<CallbackStore> RegisterRateCallback(NotifyCallback callback,
-                                                      bool initialNotify);
-
-  double GetRate() const;
-
-  void SetRate(double rate);
-
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback on the angle.
+   *
+   * @param callback the callback that will be called whenever the angle changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterAngleCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the current angle of the gyro.
+   *
+   * @return the angle measured by the gyro
+   */
+  double GetAngle() const;
+
+  /**
+   * Change the angle measured by the gyro.
+   *
+   * @param angle the new value
+   */
+  void SetAngle(double angle);
+
+  /**
+   * Register a callback on the rate.
+   *
+   * @param callback the callback that will be called whenever the rate changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterRateCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Get the rate of angle change on this gyro.
+   *
+   * @return the rate
+   */
+  double GetRate() const;
+
+  /**
+   * Change the rate of the gyro.
+   *
+   * @param rate the new rate
+   */
+  void SetRate(double rate);
+
+  /**
+   * Register a callback on whether the gyro is initialized.
+   *
+   * @param callback the callback that will be called whenever the gyro is
+   *                 initialized
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if the gyro is initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Set whether this gyro is initialized.
+   *
+   * @param initialized the new value
+   */
   void SetInitialized(bool initialized);
 
+  /**
+   * Reset all simulation data for this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/AnalogInputSim.h b/wpilibc/src/main/native/include/frc/simulation/AnalogInputSim.h
index a52cec4..03d7548 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AnalogInputSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AnalogInputSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,69 +33,237 @@
    */
   explicit AnalogInputSim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback on whether the analog input is initialized.
+   *
+   * @param callback the callback that will be called whenever the analog input
+   *                 is initialized
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if this analog input has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Change whether this analog input has been initialized.
+   *
+   * @param initialized the new value
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterAverageBitsCallback(
+  /**
+   * Register a callback on the number of average bits.
+   *
+   * @param callback the callback that will be called whenever the number of
+   *                 average bits is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterAverageBitsCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the number of average bits.
+   *
+   * @return the number of average bits
+   */
   int GetAverageBits() const;
 
+  /**
+   * Change the number of average bits.
+   *
+   * @param averageBits the new value
+   */
   void SetAverageBits(int averageBits);
 
-  std::unique_ptr<CallbackStore> RegisterOversampleBitsCallback(
+  /**
+   * Register a callback on the amount of oversampling bits.
+   *
+   * @param callback the callback that will be called whenever the oversampling
+   *                 bits are changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterOversampleBitsCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the amount of oversampling bits.
+   *
+   * @return the amount of oversampling bits
+   */
   int GetOversampleBits() const;
 
+  /**
+   * Change the amount of oversampling bits.
+   *
+   * @param oversampleBits the new value
+   */
   void SetOversampleBits(int oversampleBits);
 
-  std::unique_ptr<CallbackStore> RegisterVoltageCallback(
+  /**
+   * Register a callback on the voltage.
+   *
+   * @param callback the callback that will be called whenever the voltage is
+   *                 changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterVoltageCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the voltage.
+   *
+   * @return the voltage
+   */
   double GetVoltage() const;
 
+  /**
+   * Change the voltage.
+   *
+   * @param voltage the new value
+   */
   void SetVoltage(double voltage);
 
-  std::unique_ptr<CallbackStore> RegisterAccumulatorInitializedCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on whether the accumulator is initialized.
+   *
+   * @param callback the callback that will be called whenever the accumulator
+   *                 is initialized
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterAccumulatorInitializedCallback(NotifyCallback callback,
+                                         bool initialNotify);
 
+  /**
+   * Check if the accumulator has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetAccumulatorInitialized() const;
 
+  /**
+   * Change whether the accumulator has been initialized.
+   *
+   * @param accumulatorInitialized the new value
+   */
   void SetAccumulatorInitialized(bool accumulatorInitialized);
 
-  std::unique_ptr<CallbackStore> RegisterAccumulatorValueCallback(
+  /**
+   * Register a callback on the accumulator value.
+   *
+   * @param callback the callback that will be called whenever the accumulator
+   *                 value is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterAccumulatorValueCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the accumulator value.
+   *
+   * @return the accumulator value
+   */
   int64_t GetAccumulatorValue() const;
 
+  /**
+   * Change the accumulator value.
+   *
+   * @param accumulatorValue the new value
+   */
   void SetAccumulatorValue(int64_t accumulatorValue);
 
-  std::unique_ptr<CallbackStore> RegisterAccumulatorCountCallback(
+  /**
+   * Register a callback on the accumulator count.
+   *
+   * @param callback the callback that will be called whenever the accumulator
+   *                 count is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterAccumulatorCountCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the accumulator count.
+   *
+   * @return the accumulator count.
+   */
   int64_t GetAccumulatorCount() const;
 
+  /**
+   * Change the accumulator count.
+   *
+   * @param accumulatorCount the new count.
+   */
   void SetAccumulatorCount(int64_t accumulatorCount);
 
-  std::unique_ptr<CallbackStore> RegisterAccumulatorCenterCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on the accumulator center.
+   *
+   * @param callback the callback that will be called whenever the accumulator
+   *                 center is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterAccumulatorCenterCallback(NotifyCallback callback,
+                                    bool initialNotify);
 
+  /**
+   * Get the accumulator center.
+   *
+   * @return the accumulator center
+   */
   int GetAccumulatorCenter() const;
 
+  /**
+   * Change the accumulator center.
+   *
+   * @param accumulatorCenter the new center
+   */
   void SetAccumulatorCenter(int accumulatorCenter);
 
-  std::unique_ptr<CallbackStore> RegisterAccumulatorDeadbandCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on the accumulator deadband.
+   *
+   * @param callback the callback that will be called whenever the accumulator
+   *                 deadband is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterAccumulatorDeadbandCallback(NotifyCallback callback,
+                                      bool initialNotify);
 
+  /**
+   * Get the accumulator deadband.
+   *
+   * @return the accumulator deadband
+   */
   int GetAccumulatorDeadband() const;
 
+  /**
+   * Change the accumulator deadband.
+   *
+   * @param accumulatorDeadband the new deadband
+   */
   void SetAccumulatorDeadband(int accumulatorDeadband);
 
+  /**
+   * Reset all simulation data for this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/AnalogOutputSim.h b/wpilibc/src/main/native/include/frc/simulation/AnalogOutputSim.h
index e468fa5..ffec03a 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AnalogOutputSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AnalogOutputSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,20 +33,57 @@
    */
   explicit AnalogOutputSim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterVoltageCallback(
+  /**
+   * Register a callback to be run whenever the voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterVoltageCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the analog output voltage.
+   *
+   * @return the voltage on this analog output
+   */
   double GetVoltage() const;
 
+  /**
+   * Set the analog output voltage.
+   *
+   * @param voltage the new voltage on this analog output
+   */
   void SetVoltage(double voltage);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback to be run when this analog output is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether this analog output has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Define whether this analog output has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
   void SetInitialized(bool initialized);
 
+  /**
+   * Reset all simulation data on this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/AnalogTriggerSim.h b/wpilibc/src/main/native/include/frc/simulation/AnalogTriggerSim.h
index 60d62e1..04e9e9b 100644
--- a/wpilibc/src/main/native/include/frc/simulation/AnalogTriggerSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/AnalogTriggerSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -48,27 +45,86 @@
    */
   static AnalogTriggerSim CreateForIndex(int index);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback on whether the analog trigger is initialized.
+   *
+   * @param callback the callback that will be called whenever the analog
+   *                 trigger is initialized
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if this analog trigger has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Change whether this analog trigger has been initialized.
+   *
+   * @param initialized the new value
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterTriggerLowerBoundCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on the lower bound.
+   *
+   * @param callback the callback that will be called whenever the lower bound
+   *                 is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterTriggerLowerBoundCallback(NotifyCallback callback,
+                                    bool initialNotify);
 
+  /**
+   * Get the lower bound.
+   *
+   * @return the lower bound
+   */
   double GetTriggerLowerBound() const;
 
+  /**
+   * Change the lower bound.
+   *
+   * @param triggerLowerBound the new lower bound
+   */
   void SetTriggerLowerBound(double triggerLowerBound);
 
-  std::unique_ptr<CallbackStore> RegisterTriggerUpperBoundCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on the upper bound.
+   *
+   * @param callback the callback that will be called whenever the upper bound
+   *                 is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterTriggerUpperBoundCallback(NotifyCallback callback,
+                                    bool initialNotify);
 
+  /**
+   * Get the upper bound.
+   *
+   * @return the upper bound
+   */
   double GetTriggerUpperBound() const;
 
+  /**
+   * Change the upper bound.
+   *
+   * @param triggerUpperBound the new upper bound
+   */
   void SetTriggerUpperBound(double triggerUpperBound);
 
+  /**
+   * Reset all simulation data for this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/BatterySim.h b/wpilibc/src/main/native/include/frc/simulation/BatterySim.h
index ef8fb5d..4a350cf 100644
--- a/wpilibc/src/main/native/include/frc/simulation/BatterySim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/BatterySim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -15,13 +12,16 @@
 
 namespace frc::sim {
 
+/**
+ * A utility class to simulate the robot battery.
+ */
 class BatterySim {
  public:
   /**
    * Calculate the loaded battery voltage. Use this with
-   * {@link RoboRioSim#setVInVoltage(double)} to set the simulated battery
-   * voltage, which can then be retrieved with the {@link
-   * RobotController#getBatteryVoltage()} method.
+   * RoboRioSim::SetVInVoltage(double) to set the simulated battery voltage,
+   * which can then be retrieved with the RobotController::GetBatteryVoltage()
+   * method.
    *
    * @param nominalVoltage The nominal battery voltage. Usually 12v.
    * @param resistance     The forward resistance of the battery. Most batteries
@@ -38,10 +38,10 @@
 
   /**
    * Calculate the loaded battery voltage. Use this with
-   * {@link RoboRioSim#setVInVoltage(double)} to set the simulated battery
-   * voltage, which can then be retrieved with the {@link
-   * RobotController#getBatteryVoltage()} method. This function assumes a
-   * nominal voltage of 12v and a resistance of 20 milliohms (0.020 ohms)
+   * RoboRioSimSetVInVoltage(double) to set the simulated battery voltage, which
+   * can then be retrieved with the RobotController::GetBatteryVoltage() method.
+   * This function assumes a nominal voltage of 12V and a resistance of 20
+   * milliohms (0.020 ohms).
    *
    * @param currents The currents drawn from the battery.
    * @return The battery's voltage under load.
diff --git a/wpilibc/src/main/native/include/frc/simulation/BuiltInAccelerometerSim.h b/wpilibc/src/main/native/include/frc/simulation/BuiltInAccelerometerSim.h
index 49a581c..9ffcf5b 100644
--- a/wpilibc/src/main/native/include/frc/simulation/BuiltInAccelerometerSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/BuiltInAccelerometerSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,41 +33,129 @@
    */
   explicit BuiltInAccelerometerSim(const BuiltInAccelerometer& accel);
 
-  std::unique_ptr<CallbackStore> RegisterActiveCallback(NotifyCallback callback,
-                                                        bool initialNotify);
+  /**
+   * Register a callback to be run when this accelerometer activates.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterActiveCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the accelerometer is active.
+   *
+   * @return true if active
+   */
   bool GetActive() const;
 
+  /**
+   * Define whether this accelerometer is active.
+   *
+   * @param active the new state
+   */
   void SetActive(bool active);
 
-  std::unique_ptr<CallbackStore> RegisterRangeCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback to be run whenever the range changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterRangeCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check the range of this accelerometer.
+   *
+   * @return the accelerometer range
+   */
   HAL_AccelerometerRange GetRange() const;
 
+  /**
+   * Change the range of this accelerometer.
+   *
+   * @param range the new accelerometer range
+   */
   void SetRange(HAL_AccelerometerRange range);
 
-  std::unique_ptr<CallbackStore> RegisterXCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the X axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterXCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the X axis value.
+   *
+   * @return the X axis measurement
+   */
   double GetX() const;
 
+  /**
+   * Change the X axis value of the accelerometer.
+   *
+   * @param x the new reading of the X axis
+   */
   void SetX(double x);
 
-  std::unique_ptr<CallbackStore> RegisterYCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Y axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterYCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Y axis value.
+   *
+   * @return the Y axis measurement
+   */
   double GetY() const;
 
+  /**
+   * Change the Y axis value of the accelerometer.
+   *
+   * @param y the new reading of the Y axis
+   */
   void SetY(double y);
 
-  std::unique_ptr<CallbackStore> RegisterZCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Z axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterZCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Z axis value.
+   *
+   * @return the Z axis measurement
+   */
   double GetZ() const;
 
+  /**
+   * Change the Z axis value of the accelerometer.
+   *
+   * @param z the new reading of the Z axis
+   */
   void SetZ(double z);
 
+  /**
+   * Reset all simulation data of this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/CTREPCMSim.h b/wpilibc/src/main/native/include/frc/simulation/CTREPCMSim.h
new file mode 100644
index 0000000..0929308
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/CTREPCMSim.h
@@ -0,0 +1,212 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include "frc/PneumaticsBase.h"
+#include "frc/simulation/CallbackStore.h"
+
+namespace frc {
+
+class Compressor;
+
+namespace sim {
+
+/**
+ * Class to control a simulated Pneumatic Control Module (PCM).
+ */
+class CTREPCMSim {
+ public:
+  /**
+   * Constructs with the default PCM module number (CAN ID).
+   */
+  CTREPCMSim();
+
+  /**
+   * Constructs from a PCM module number (CAN ID).
+   *
+   * @param module module number
+   */
+  explicit CTREPCMSim(int module);
+
+  explicit CTREPCMSim(const PneumaticsBase& pneumatics);
+
+  /**
+   * Register a callback to be run when a solenoid is initialized on a channel.
+   *
+   * @param callback the callback
+   * @param initialNotify should the callback be run with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if a solenoid has been initialized on a specific channel.
+   *
+   * @return true if initialized
+   */
+  bool GetInitialized() const;
+
+  /**
+   * Define whether a solenoid has been initialized on a specific channel.
+   *
+   * @param solenoidInitialized is there a solenoid initialized on that channel
+   */
+  void SetInitialized(bool solenoidInitialized);
+
+  /**
+   * Register a callback to be run when the solenoid output on a channel
+   * changes.
+   *
+   * @param channel the channel to monitor
+   * @param callback the callback
+   * @param initialNotify should the callback be run with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterSolenoidOutputCallback(
+      int channel, NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the solenoid output on a specific channel.
+   *
+   * @param channel the channel to check
+   * @return the solenoid output
+   */
+  bool GetSolenoidOutput(int channel) const;
+
+  /**
+   * Change the solenoid output on a specific channel.
+   *
+   * @param channel the channel to check
+   * @param solenoidOutput the new solenoid output
+   */
+  void SetSolenoidOutput(int channel, bool solenoidOutput);
+
+  /**
+   * Register a callback to be run when the compressor activates.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterCompressorOnCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if the compressor is on.
+   *
+   * @return true if the compressor is active
+   */
+  bool GetCompressorOn() const;
+
+  /**
+   * Set whether the compressor is active.
+   *
+   * @param compressorOn the new value
+   */
+  void SetCompressorOn(bool compressorOn);
+
+  /**
+   * Register a callback to be run whenever the closed loop state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterClosedLoopEnabledCallback(NotifyCallback callback,
+                                    bool initialNotify);
+
+  /**
+   * Check whether the closed loop compressor control is active.
+   *
+   * @return true if active
+   */
+  bool GetClosedLoopEnabled() const;
+
+  /**
+   * Turn on/off the closed loop control of the compressor.
+   *
+   * @param closedLoopEnabled whether the control loop is active
+   */
+  void SetClosedLoopEnabled(bool closedLoopEnabled);
+
+  /**
+   * Register a callback to be run whenever the pressure switch value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPressureSwitchCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the value of the pressure switch.
+   *
+   * @return the pressure switch value
+   */
+  bool GetPressureSwitch() const;
+
+  /**
+   * Set the value of the pressure switch.
+   *
+   * @param pressureSwitch the new value
+   */
+  void SetPressureSwitch(bool pressureSwitch);
+
+  /**
+   * Register a callback to be run whenever the compressor current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterCompressorCurrentCallback(NotifyCallback callback,
+                                    bool initialNotify);
+
+  /**
+   * Read the compressor current.
+   *
+   * @return the current of the compressor connected to this module
+   */
+  double GetCompressorCurrent() const;
+
+  /**
+   * Set the compressor current.
+   *
+   * @param compressorCurrent the new compressor current
+   */
+  void SetCompressorCurrent(double compressorCurrent);
+
+  /**
+   * Get the current value of all solenoid outputs.
+   *
+   * @return the solenoid outputs (1 bit per output)
+   */
+  uint8_t GetAllSolenoidOutputs() const;
+
+  /**
+   * Change all of the solenoid outputs.
+   *
+   * @param outputs the new solenoid outputs (1 bit per output)
+   */
+  void SetAllSolenoidOutputs(uint8_t outputs);
+
+  /**
+   * Reset all simulation data for this object.
+   */
+  void ResetData();
+
+ private:
+  int m_index;
+};
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/CallbackStore.h b/wpilibc/src/main/native/include/frc/simulation/CallbackStore.h
index 379296a..61cc6b2 100644
--- a/wpilibc/src/main/native/include/frc/simulation/CallbackStore.h
+++ b/wpilibc/src/main/native/include/frc/simulation/CallbackStore.h
@@ -1,33 +1,32 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
+#include <string_view>
 
 #include <hal/Value.h>
-#include <wpi/StringRef.h>
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
-using NotifyCallback = std::function<void(wpi::StringRef, const HAL_Value*)>;
+using NotifyCallback = std::function<void(std::string_view, const HAL_Value*)>;
 using ConstBufferCallback = std::function<void(
-    wpi::StringRef, const unsigned char* buffer, unsigned int count)>;
-typedef void (*CancelCallbackFunc)(int32_t index, int32_t uid);
-typedef void (*CancelCallbackNoIndexFunc)(int32_t uid);
-typedef void (*CancelCallbackChannelFunc)(int32_t index, int32_t channel,
-                                          int32_t uid);
+    std::string_view, const unsigned char* buffer, unsigned int count)>;
+using CancelCallbackFunc = void (*)(int32_t index, int32_t uid);
+using CancelCallbackNoIndexFunc = void (*)(int32_t uid);
+using CancelCallbackChannelFunc = void (*)(int32_t index, int32_t channel,
+                                           int32_t uid);
 
 void CallbackStoreThunk(const char* name, void* param, const HAL_Value* value);
 void ConstBufferCallbackStoreThunk(const char* name, void* param,
                                    const unsigned char* buffer,
                                    unsigned int count);
 
+/**
+ * Manages simulation callbacks; each object is associated with a callback.
+ */
 class CallbackStore {
  public:
   CallbackStore(int32_t i, NotifyCallback cb, CancelCallbackNoIndexFunc ccf);
@@ -76,5 +75,4 @@
   enum CancelType { Normal, Channel, NoIndex };
   CancelType cancelType;
 };
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/DIOSim.h b/wpilibc/src/main/native/include/frc/simulation/DIOSim.h
index f6edb39..9bbd3fb 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DIOSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DIOSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -44,41 +41,132 @@
    */
   explicit DIOSim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback to be run when this DIO is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether this DIO has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Define whether this DIO has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterValueCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback to be run whenever the DIO value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterValueCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the value of the DIO port.
+   *
+   * @return the DIO value
+   */
   bool GetValue() const;
 
+  /**
+   * Change the DIO value.
+   *
+   * @param value the new value
+   */
   void SetValue(bool value);
 
-  std::unique_ptr<CallbackStore> RegisterPulseLengthCallback(
+  /**
+   * Register a callback to be run whenever the pulse length changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPulseLengthCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the pulse length.
+   *
+   * @return the pulse length of this DIO port
+   */
   double GetPulseLength() const;
 
+  /**
+   * Change the pulse length of this DIO port.
+   *
+   * @param pulseLength the new pulse length
+   */
   void SetPulseLength(double pulseLength);
 
-  std::unique_ptr<CallbackStore> RegisterIsInputCallback(
+  /**
+   * Register a callback to be run whenever this DIO changes to be an input.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterIsInputCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether this DIO port is currently an Input.
+   *
+   * @return true if Input
+   */
   bool GetIsInput() const;
 
+  /**
+   * Define whether this DIO port is an Input.
+   *
+   * @param isInput whether this DIO should be an Input
+   */
   void SetIsInput(bool isInput);
 
-  std::unique_ptr<CallbackStore> RegisterFilterIndexCallback(
+  /**
+   * Register a callback to be run whenever the filter index changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterFilterIndexCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the filter index.
+   *
+   * @return the filter index of this DIO port
+   */
   int GetFilterIndex() const;
 
+  /**
+   * Change the filter index of this DIO port.
+   *
+   * @param filterIndex the new filter index
+   */
   void SetFilterIndex(int filterIndex);
 
+  /**
+   * Reset all simulation data of this object.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/DifferentialDrivetrainSim.h b/wpilibc/src/main/native/include/frc/simulation/DifferentialDrivetrainSim.h
index a75edb9..e64a652 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DifferentialDrivetrainSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DifferentialDrivetrainSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -24,42 +21,66 @@
   /**
    * Create a SimDrivetrain.
    *
-   * @param drivetrainPlant   The LinearSystem representing the robot's
-   * drivetrain. This system can be created with
-   * LinearSystemId#createDrivetrainVelocitySystem or
-   * LinearSystemId#identifyDrivetrainSystem.
-   * @param trackWidth        The robot's track width.
-   * @param driveMotor        A {@link DCMotor} representing the left side of
-   * the drivetrain.
-   * @param gearingRatio      The gearingRatio ratio of the left side, as output
-   * over input. This must be the same ratio as the ratio used to identify or
-   * create the drivetrainPlant.
-   * @param wheelRadiusMeters The radius of the wheels on the drivetrain, in
-   * meters.
+   * @param plant The LinearSystem representing the robot's drivetrain. This
+   *              system can be created with
+   *              LinearSystemId::DrivetrainVelocitySystem() or
+   *              LinearSystemId::IdentifyDrivetrainSystem().
+   * @param trackWidth   The robot's track width.
+   * @param driveMotor   A DCMotor representing the left side of the drivetrain.
+   * @param gearingRatio The gearingRatio ratio of the left side, as output over
+   *                     input. This must be the same ratio as the ratio used to
+   *                     identify or create the plant.
+   * @param wheelRadius  The radius of the wheels on the drivetrain, in meters.
+   * @param measurementStdDevs Standard deviations for measurements, in the form
+   *                           [x, y, heading, left velocity, right velocity,
+   *                           left distance, right distance]áµ€. Can be omitted
+   *                           if no noise is desired. Gyro standard deviations
+   *                           of 0.0001 radians, velocity standard deviations
+   *                           of 0.05 m/s, and position measurement standard
+   *                           deviations of 0.005 meters are a reasonable
+   *                           starting point.
    */
-  DifferentialDrivetrainSim(const LinearSystem<2, 2, 2>& plant,
-                            units::meter_t trackWidth, DCMotor driveMotor,
-                            double gearingRatio, units::meter_t wheelRadius);
+  DifferentialDrivetrainSim(
+      LinearSystem<2, 2, 2> plant, units::meter_t trackWidth,
+      DCMotor driveMotor, double gearingRatio, units::meter_t wheelRadius,
+      const std::array<double, 7>& measurementStdDevs = {});
 
   /**
    * Create a SimDrivetrain.
    *
-   * @param driveMotor  A {@link DCMotor} representing the left side of the
-   * drivetrain.
+   * @param driveMotor  A DCMotor representing the left side of the drivetrain.
    * @param gearing     The gearing on the drive between motor and wheel, as
-   * output over input. This must be the same ratio as the ratio used to
-   * identify or create the drivetrainPlant.
+   *                    output over input. This must be the same ratio as the
+   *                    ratio used to identify or create the plant.
    * @param J           The moment of inertia of the drivetrain about its
-   * center.
+   *                    center.
    * @param mass        The mass of the drivebase.
    * @param wheelRadius The radius of the wheels on the drivetrain.
    * @param trackWidth  The robot's track width, or distance between left and
-   * right wheels.
+   *                    right wheels.
+   * @param measurementStdDevs Standard deviations for measurements, in the form
+   *                           [x, y, heading, left velocity, right velocity,
+   *                           left distance, right distance]áµ€. Can be omitted
+   *                           if no noise is desired. Gyro standard deviations
+   *                           of 0.0001 radians, velocity standard deviations
+   *                           of 0.05 m/s, and position measurement standard
+   *                           deviations of 0.005 meters are a reasonable
+   *                           starting point.
    */
-  DifferentialDrivetrainSim(frc::DCMotor driveMotor, double gearing,
-                            units::kilogram_square_meter_t J,
-                            units::kilogram_t mass, units::meter_t wheelRadius,
-                            units::meter_t trackWidth);
+  DifferentialDrivetrainSim(
+      frc::DCMotor driveMotor, double gearing, units::kilogram_square_meter_t J,
+      units::kilogram_t mass, units::meter_t wheelRadius,
+      units::meter_t trackWidth,
+      const std::array<double, 7>& measurementStdDevs = {});
+
+  /**
+   * Clamp the input vector such that no element exceeds the battery voltage.
+   * If any does, the relative magnitudes of the input will be maintained.
+   *
+   * @param u The input vector.
+   * @return The normalized input.
+   */
+  Eigen::Vector<double, 2> ClampInput(const Eigen::Vector<double, 2>& u);
 
   /**
    * Sets the applied voltage to the drivetrain. Note that positive voltage must
@@ -81,30 +102,18 @@
   /**
    * Updates the simulation.
    *
-   * @param dt The time that's passed since the last {@link #update(double)}
-   * call.
+   * @param dt The time that's passed since the last Update(units::second_t)
+   *           call.
    */
   void Update(units::second_t dt);
 
   /**
-   * Returns an element of the state vector.
-   *
-   * @param state The row of the state vector.
-   */
-  double GetState(int state) const;
-
-  /**
    * Returns the current gearing reduction of the drivetrain, as output over
    * input.
    */
   double GetGearing() const;
 
   /**
-   * Returns the current state vector x.
-   */
-  Eigen::Matrix<double, 7, 1> GetState() const;
-
-  /**
    * Returns the direction the robot is pointing.
    *
    * Note that this angle is counterclockwise-positive, while most gyros are
@@ -118,6 +127,48 @@
   Pose2d GetPose() const;
 
   /**
+   * Get the right encoder position in meters.
+   * @return The encoder position.
+   */
+  units::meter_t GetRightPosition() const {
+    return units::meter_t{GetOutput(State::kRightPosition)};
+  }
+
+  /**
+   * Get the right encoder velocity in meters per second.
+   * @return The encoder velocity.
+   */
+  units::meters_per_second_t GetRightVelocity() const {
+    return units::meters_per_second_t{GetOutput(State::kRightVelocity)};
+  }
+
+  /**
+   * Get the left encoder position in meters.
+   * @return The encoder position.
+   */
+  units::meter_t GetLeftPosition() const {
+    return units::meter_t{GetOutput(State::kLeftPosition)};
+  }
+
+  /**
+   * Get the left encoder velocity in meters per second.
+   * @return The encoder velocity.
+   */
+  units::meters_per_second_t GetLeftVelocity() const {
+    return units::meters_per_second_t{GetOutput(State::kLeftVelocity)};
+  }
+
+  /**
+   * Returns the currently drawn current for the right side.
+   */
+  units::ampere_t GetRightCurrentDraw() const;
+
+  /**
+   * Returns the currently drawn current for the left side.
+   */
+  units::ampere_t GetLeftCurrentDraw() const;
+
+  /**
    * Returns the currently drawn current.
    */
   units::ampere_t GetCurrentDraw() const;
@@ -127,7 +178,7 @@
    *
    * @param state The state.
    */
-  void SetState(const Eigen::Matrix<double, 7, 1>& state);
+  void SetState(const Eigen::Vector<double, 7>& state);
 
   /**
    * Sets the system pose.
@@ -136,8 +187,8 @@
    */
   void SetPose(const frc::Pose2d& pose);
 
-  Eigen::Matrix<double, 7, 1> Dynamics(const Eigen::Matrix<double, 7, 1>& x,
-                                       const Eigen::Matrix<double, 2, 1>& u);
+  Eigen::Vector<double, 7> Dynamics(const Eigen::Vector<double, 7>& x,
+                                    const Eigen::Vector<double, 2>& u);
 
   class State {
    public:
@@ -189,10 +240,16 @@
    * @param motor     The motors installed in the bot.
    * @param gearing   The gearing reduction used.
    * @param wheelSize The wheel size.
+   * @param measurementStdDevs Standard deviations for measurements, in the form
+   * [x, y, heading, left velocity, right velocity, left distance, right
+   * distance]áµ€. Can be omitted if no noise is desired. Gyro standard
+   * deviations of 0.0001 radians, velocity standard deviations of 0.05 m/s, and
+   * position measurement standard deviations of 0.005 meters are a reasonable
+   * starting point.
    */
-  static DifferentialDrivetrainSim CreateKitbotSim(frc::DCMotor motor,
-                                                   double gearing,
-                                                   units::meter_t wheelSize) {
+  static DifferentialDrivetrainSim CreateKitbotSim(
+      frc::DCMotor motor, double gearing, units::meter_t wheelSize,
+      const std::array<double, 7>& measurementStdDevs = {}) {
     // MOI estimation -- note that I = m r^2 for point masses
     units::kilogram_square_meter_t batteryMoi = 12.5_lb * 10_in * 10_in;
     units::kilogram_square_meter_t gearboxMoi = (2.8_lb + 2.0_lb) *
@@ -200,7 +257,8 @@
                                                 * (26_in / 2) * (26_in / 2);
 
     return DifferentialDrivetrainSim{
-        motor, gearing, batteryMoi + gearboxMoi, 25_kg, wheelSize / 2.0, 26_in};
+        motor,           gearing, batteryMoi + gearboxMoi, 60_lb,
+        wheelSize / 2.0, 26_in,   measurementStdDevs};
   }
 
   /**
@@ -210,16 +268,48 @@
    * @param gearing   The gearing reduction used.
    * @param wheelSize The wheel size.
    * @param J         The moment of inertia of the drivebase. This can be
-   * calculated using frc-characterization.
+   * calculated using SysId.
+   * @param measurementStdDevs Standard deviations for measurements, in the form
+   * [x, y, heading, left velocity, right velocity, left distance, right
+   * distance]áµ€. Can be omitted if no noise is desired. Gyro standard
+   * deviations of 0.0001 radians, velocity standard deviations of 0.05 m/s, and
+   * position measurement standard deviations of 0.005 meters are a reasonable
+   * starting point.
    */
   static DifferentialDrivetrainSim CreateKitbotSim(
       frc::DCMotor motor, double gearing, units::meter_t wheelSize,
-      units::kilogram_square_meter_t J) {
-    return DifferentialDrivetrainSim{motor, gearing,         J,
-                                     25_kg, wheelSize / 2.0, 26_in};
+      units::kilogram_square_meter_t J,
+      const std::array<double, 7>& measurementStdDevs = {}) {
+    return DifferentialDrivetrainSim{
+        motor, gearing, J, 60_lb, wheelSize / 2.0, 26_in, measurementStdDevs};
   }
 
  private:
+  /**
+   * Returns an element of the state vector.
+   *
+   * @param output The row of the output vector.
+   */
+  double GetOutput(int output) const;
+
+  /**
+   * Returns the current output vector y.
+   */
+  Eigen::Vector<double, 7> GetOutput() const;
+
+  /**
+   * Returns an element of the state vector. Note that this will not include
+   * noise!
+   *
+   * @param output The row of the output vector.
+   */
+  double GetState(int state) const;
+
+  /**
+   * Returns the current state vector x. Note that this will not include noise!
+   */
+  Eigen::Vector<double, 7> GetState() const;
+
   LinearSystem<2, 2, 2> m_plant;
   units::meter_t m_rb;
   units::meter_t m_wheelRadius;
@@ -229,7 +319,9 @@
   double m_originalGearing;
   double m_currentGearing;
 
-  Eigen::Matrix<double, 7, 1> m_x;
-  Eigen::Matrix<double, 2, 1> m_u;
+  Eigen::Vector<double, 7> m_x;
+  Eigen::Vector<double, 2> m_u;
+  Eigen::Vector<double, 7> m_y;
+  std::array<double, 7> m_measurementStdDevs;
 };
 }  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/DigitalPWMSim.h b/wpilibc/src/main/native/include/frc/simulation/DigitalPWMSim.h
index 2ff8a12..53caee7 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DigitalPWMSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DigitalPWMSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -50,27 +47,81 @@
    */
   static DigitalPWMSim CreateForIndex(int index);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback to be run when this PWM output is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether this PWM output has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Define whether this PWM output has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterDutyCycleCallback(
+  /**
+   * Register a callback to be run whenever the duty cycle value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterDutyCycleCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the duty cycle value.
+   *
+   * @return the duty cycle value of this PWM output
+   */
   double GetDutyCycle() const;
 
+  /**
+   * Set the duty cycle value of this PWM output.
+   *
+   * @param dutyCycle the new value
+   */
   void SetDutyCycle(double dutyCycle);
 
-  std::unique_ptr<CallbackStore> RegisterPinCallback(NotifyCallback callback,
-                                                     bool initialNotify);
+  /**
+   * Register a callback to be run whenever the pin changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPinCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check the pin number.
+   *
+   * @return the pin number
+   */
   int GetPin() const;
 
+  /**
+   * Change the pin number.
+   *
+   * @param pin the new pin number
+   */
   void SetPin(int pin);
 
+  /**
+   * Reset all simulation data.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/DriverStationSim.h b/wpilibc/src/main/native/include/frc/simulation/DriverStationSim.h
index 80cf942..412a921 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DriverStationSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DriverStationSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -14,68 +11,212 @@
 #include "frc/DriverStation.h"
 #include "frc/simulation/CallbackStore.h"
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
 /**
  * Class to control a simulated driver station.
  */
 class DriverStationSim {
  public:
-  static std::unique_ptr<CallbackStore> RegisterEnabledCallback(
+  /**
+   * Register a callback on whether the DS is enabled.
+   *
+   * @param callback the callback that will be called whenever the enabled
+   *                 state is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore> RegisterEnabledCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the DS is enabled.
+   *
+   * @return true if enabled
+   */
   static bool GetEnabled();
 
+  /**
+   * Change whether the DS is enabled.
+   *
+   * @param enabled the new value
+   */
   static void SetEnabled(bool enabled);
 
-  static std::unique_ptr<CallbackStore> RegisterAutonomousCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on whether the DS is in autonomous mode.
+   *
+   * @param callback the callback that will be called on autonomous mode
+   *                 entrance/exit
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterAutonomousCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the DS is in autonomous.
+   *
+   * @return true if autonomous
+   */
   static bool GetAutonomous();
 
+  /**
+   * Change whether the DS is in autonomous.
+   *
+   * @param autonomous the new value
+   */
   static void SetAutonomous(bool autonomous);
 
-  static std::unique_ptr<CallbackStore> RegisterTestCallback(
+  /**
+   * Register a callback on whether the DS is in test mode.
+   *
+   * @param callback the callback that will be called whenever the test mode
+   *                 is entered or left
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore> RegisterTestCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the DS is in test.
+   *
+   * @return true if test
+   */
   static bool GetTest();
 
+  /**
+   * Change whether the DS is in test.
+   *
+   * @param test the new value
+   */
   static void SetTest(bool test);
 
-  static std::unique_ptr<CallbackStore> RegisterEStopCallback(
+  /**
+   * Register a callback on the eStop state.
+   *
+   * @param callback the callback that will be called whenever the eStop state
+   *                 changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore> RegisterEStopCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if eStop has been activated.
+   *
+   * @return true if eStopped
+   */
   static bool GetEStop();
 
+  /**
+   * Set whether eStop is active.
+   *
+   * @param eStop true to activate
+   */
   static void SetEStop(bool eStop);
 
-  static std::unique_ptr<CallbackStore> RegisterFmsAttachedCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on whether the FMS is connected.
+   *
+   * @param callback the callback that will be called whenever the FMS
+   *                 connection changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterFmsAttachedCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the FMS is connected.
+   *
+   * @return true if FMS is connected
+   */
   static bool GetFmsAttached();
 
+  /**
+   * Change whether the FMS is connected.
+   *
+   * @param fmsAttached the new value
+   */
   static void SetFmsAttached(bool fmsAttached);
 
-  static std::unique_ptr<CallbackStore> RegisterDsAttachedCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on whether the DS is connected.
+   *
+   * @param callback the callback that will be called whenever the DS
+   *                 connection changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterDsAttachedCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the DS is attached.
+   *
+   * @return true if attached
+   */
   static bool GetDsAttached();
 
+  /**
+   * Change whether the DS is attached.
+   *
+   * @param dsAttached the new value
+   */
   static void SetDsAttached(bool dsAttached);
 
-  static std::unique_ptr<CallbackStore> RegisterAllianceStationIdCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback on the alliance station ID.
+   *
+   * @param callback the callback that will be called whenever the alliance
+   *                 station changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterAllianceStationIdCallback(NotifyCallback callback,
+                                    bool initialNotify);
 
+  /**
+   * Get the alliance station ID (color + number).
+   *
+   * @return the alliance station color and number
+   */
   static HAL_AllianceStationID GetAllianceStationId();
 
+  /**
+   * Change the alliance station.
+   *
+   * @param allianceStationId the new alliance station
+   */
   static void SetAllianceStationId(HAL_AllianceStationID allianceStationId);
 
-  static std::unique_ptr<CallbackStore> RegisterMatchTimeCallback(
+  /**
+   * Register a callback on match time.
+   *
+   * @param callback the callback that will be called whenever match time
+   *                 changes
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore> RegisterMatchTimeCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the current value of the match timer.
+   *
+   * @return the current match time
+   */
   static double GetMatchTime();
 
+  /**
+   * Sets the match timer.
+   *
+   * @param matchTime the new match time
+   */
   static void SetMatchTime(double matchTime);
 
   /**
@@ -116,7 +257,7 @@
   static int GetJoystickRumble(int stick, int rumbleNum);
 
   /**
-   * Sets the state of one joystick button. Button indexes begin at 1.
+   * Sets the state of one joystick button. %Button indexes begin at 1.
    *
    * @param stick The joystick number
    * @param button The button index, beginning at 1
@@ -242,7 +383,9 @@
    */
   static void SetReplayNumber(int replayNumber);
 
+  /**
+   * Reset all simulation data for the Driver Station.
+   */
   static void ResetData();
 };
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/DutyCycleEncoderSim.h b/wpilibc/src/main/native/include/frc/simulation/DutyCycleEncoderSim.h
index 5d9a039..19577bb 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DutyCycleEncoderSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DutyCycleEncoderSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -24,7 +21,7 @@
   /**
    * Constructs from a DutyCycleEncoder object.
    *
-   * @param dutyCycleEncoder DutyCycleEncoder to simulate
+   * @param encoder DutyCycleEncoder to simulate
    */
   explicit DutyCycleEncoderSim(const DutyCycleEncoder& encoder);
 
diff --git a/wpilibc/src/main/native/include/frc/simulation/DutyCycleSim.h b/wpilibc/src/main/native/include/frc/simulation/DutyCycleSim.h
index 40dad13..ec7b48c 100644
--- a/wpilibc/src/main/native/include/frc/simulation/DutyCycleSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/DutyCycleSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -47,27 +44,81 @@
    */
   static DutyCycleSim CreateForIndex(int index);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback to be run when this duty cycle input is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether this duty cycle input has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Define whether this duty cycle input has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterFrequencyCallback(
+  /**
+   * Register a callback to be run whenever the frequency changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterFrequencyCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the frequency.
+   *
+   * @return the duty cycle frequency
+   */
   int GetFrequency() const;
 
-  void SetFrequency(int count);
+  /**
+   * Change the duty cycle frequency.
+   *
+   * @param frequency the new frequency
+   */
+  void SetFrequency(int frequency);
 
-  std::unique_ptr<CallbackStore> RegisterOutputCallback(NotifyCallback callback,
-                                                        bool initialNotify);
+  /**
+   * Register a callback to be run whenever the output changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterOutputCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the output from this duty cycle port.
+   *
+   * @return the output value
+   */
   double GetOutput() const;
 
-  void SetOutput(double period);
+  /**
+   * Change the duty cycle output.
+   *
+   * @param output the new output value
+   */
+  void SetOutput(double output);
 
+  /**
+   * Reset all simulation data for the duty cycle output.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/ElevatorSim.h b/wpilibc/src/main/native/include/frc/simulation/ElevatorSim.h
index 9b7069f..14b6d2d 100644
--- a/wpilibc/src/main/native/include/frc/simulation/ElevatorSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/ElevatorSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -61,20 +58,34 @@
               const std::array<double, 1>& measurementStdDevs = {0.0});
 
   /**
+   * Returns whether the elevator would hit the lower limit.
+   *
+   * @param elevatorHeight The elevator height.
+   * @return Whether the elevator would hit the lower limit.
+   */
+  bool WouldHitLowerLimit(units::meter_t elevatorHeight) const;
+
+  /**
+   * Returns whether the elevator would hit the upper limit.
+   *
+   * @param elevatorHeight The elevator height.
+   * @return Whether the elevator would hit the upper limit.
+   */
+  bool WouldHitUpperLimit(units::meter_t elevatorHeight) const;
+
+  /**
    * Returns whether the elevator has hit the lower limit.
    *
-   * @param x The current elevator state.
    * @return Whether the elevator has hit the lower limit.
    */
-  bool HasHitLowerLimit(const Eigen::Matrix<double, 2, 1>& x) const;
+  bool HasHitLowerLimit() const;
 
   /**
    * Returns whether the elevator has hit the upper limit.
    *
-   * @param x The current elevator state.
    * @return Whether the elevator has hit the upper limit.
    */
-  bool HasHitUpperLimit(const Eigen::Matrix<double, 2, 1>& x) const;
+  bool HasHitUpperLimit() const;
 
   /**
    * Returns the position of the elevator.
@@ -112,9 +123,9 @@
    * @param u           The system inputs (voltage).
    * @param dt          The time difference between controller updates.
    */
-  Eigen::Matrix<double, 2, 1> UpdateX(
-      const Eigen::Matrix<double, 2, 1>& currentXhat,
-      const Eigen::Matrix<double, 1, 1>& u, units::second_t dt) override;
+  Eigen::Vector<double, 2> UpdateX(const Eigen::Vector<double, 2>& currentXhat,
+                                   const Eigen::Vector<double, 1>& u,
+                                   units::second_t dt) override;
 
  private:
   DCMotor m_gearbox;
diff --git a/wpilibc/src/main/native/include/frc/simulation/EncoderSim.h b/wpilibc/src/main/native/include/frc/simulation/EncoderSim.h
index 4049ab8..0d578b4 100644
--- a/wpilibc/src/main/native/include/frc/simulation/EncoderSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/EncoderSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -48,77 +45,261 @@
    */
   static EncoderSim CreateForIndex(int index);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback on the Initialized property of the encoder.
+   *
+   * @param callback the callback that will be called whenever the Initialized
+   *                 property is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the Initialized value of the encoder.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Change the Initialized value of the encoder.
+   *
+   * @param initialized the new value
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterCountCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback on the count property of the encoder.
+   *
+   * @param callback the callback that will be called whenever the count
+   *                 property is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterCountCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the count of the encoder.
+   *
+   * @return the count
+   */
   int GetCount() const;
 
+  /**
+   * Change the count of the encoder.
+   *
+   * @param count the new count
+   */
   void SetCount(int count);
 
-  std::unique_ptr<CallbackStore> RegisterPeriodCallback(NotifyCallback callback,
-                                                        bool initialNotify);
+  /**
+   * Register a callback on the period of the encoder.
+   *
+   * @param callback the callback that will be called whenever the period is
+   *                 changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPeriodCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the period of the encoder.
+   *
+   * @return the encoder period
+   */
   double GetPeriod() const;
 
+  /**
+   * Change the encoder period.
+   *
+   * @param period the new period
+   */
   void SetPeriod(double period);
 
-  std::unique_ptr<CallbackStore> RegisterResetCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback to be called whenever the encoder is reset.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterResetCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check if the encoder has been reset.
+   *
+   * @return true if reset
+   */
   bool GetReset() const;
 
+  /**
+   * Change the reset property of the encoder.
+   *
+   * @param reset the new value
+   */
   void SetReset(bool reset);
 
-  std::unique_ptr<CallbackStore> RegisterMaxPeriodCallback(
+  /**
+   * Register a callback to be run whenever the max period of the encoder is
+   * changed.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterMaxPeriodCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the max period of the encoder.
+   *
+   * @return the max period of the encoder
+   */
   double GetMaxPeriod() const;
 
+  /**
+   * Change the max period of the encoder.
+   *
+   * @param maxPeriod the new value
+   */
   void SetMaxPeriod(double maxPeriod);
 
-  std::unique_ptr<CallbackStore> RegisterDirectionCallback(
+  /**
+   * Register a callback on the direction of the encoder.
+   *
+   * @param callback the callback that will be called whenever the direction
+   *                 is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterDirectionCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the direction of the encoder.
+   *
+   * @return the direction of the encoder
+   */
   bool GetDirection() const;
 
+  /**
+   * Set the direction of the encoder.
+   *
+   * @param direction the new direction
+   */
   void SetDirection(bool direction);
 
-  std::unique_ptr<CallbackStore> RegisterReverseDirectionCallback(
+  /**
+   * Register a callback on the reverse direction.
+   *
+   * @param callback the callback that will be called whenever the reverse
+   *                 direction is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterReverseDirectionCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the reverse direction of the encoder.
+   *
+   * @return the reverse direction of the encoder
+   */
   bool GetReverseDirection() const;
 
+  /**
+   * Set the reverse direction.
+   *
+   * @param reverseDirection the new value
+   */
   void SetReverseDirection(bool reverseDirection);
 
-  std::unique_ptr<CallbackStore> RegisterSamplesToAverageCallback(
+  /**
+   * Register a callback on the samples-to-average value of this encoder.
+   *
+   * @param callback the callback that will be called whenever the
+   *                 samples-to-average is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterSamplesToAverageCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the samples-to-average value.
+   *
+   * @return the samples-to-average value
+   */
   int GetSamplesToAverage() const;
 
+  /**
+   * Set the samples-to-average value.
+   *
+   * @param samplesToAverage the new value
+   */
   void SetSamplesToAverage(int samplesToAverage);
 
-  std::unique_ptr<CallbackStore> RegisterDistancePerPulseCallback(
+  /**
+   * Register a callback on the distance per pulse value of this encoder.
+   *
+   * @param callback the callback that will be called whenever the
+   *                 distance per pulse is changed
+   * @param initialNotify if true, the callback will be run on the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterDistancePerPulseCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Read the distance per pulse of the encoder.
+   *
+   * @return the encoder distance per pulse
+   */
   double GetDistancePerPulse() const;
 
+  /**
+   * Change the encoder distance per pulse.
+   *
+   * @param distancePerPulse the new distance per pulse
+   */
   void SetDistancePerPulse(double distancePerPulse);
 
+  /**
+   * Resets all simulation data for this encoder.
+   */
   void ResetData();
 
+  /**
+   * Change the encoder distance.
+   *
+   * @param distance the new distance
+   */
   void SetDistance(double distance);
 
+  /**
+   * Read the distance of the encoder.
+   *
+   * @return the encoder distance
+   */
   double GetDistance();
 
+  /**
+   * Change the rate of the encoder.
+   *
+   * @param rate the new rate
+   */
   void SetRate(double rate);
 
+  /**
+   * Get the rate of the encoder.
+   *
+   * @return the rate of change
+   */
   double GetRate();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/Field2d.h b/wpilibc/src/main/native/include/frc/simulation/Field2d.h
deleted file mode 100644
index de30847..0000000
--- a/wpilibc/src/main/native/include/frc/simulation/Field2d.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <hal/SimDevice.h>
-#include <units/length.h>
-
-#include "frc/geometry/Pose2d.h"
-#include "frc/geometry/Rotation2d.h"
-
-namespace frc {
-
-/**
- * 2D representation of game field (for simulation).
- *
- * In non-simulation mode this simply stores and returns the robot pose.
- *
- * The robot pose is the actual location shown on the simulation view.
- * This may or may not match the robot's internal odometry.  For example, if
- * the robot is shown at a particular starting location, the pose in this
- * class would represent the actual location on the field, but the robot's
- * internal state might have a 0,0,0 pose (unless it's initialized to
- * something different).
- *
- * As the user is able to edit the pose, code performing updates should get
- * the robot pose, transform it as appropriate (e.g. based on simulated wheel
- * velocity), and set the new pose.
- */
-class Field2d {
- public:
-  Field2d();
-
-  /**
-   * Set the robot pose from a Pose object.
-   *
-   * @param pose 2D pose
-   */
-  void SetRobotPose(const Pose2d& pose);
-
-  /**
-   * Set the robot pose from x, y, and rotation.
-   *
-   * @param x X location
-   * @param y Y location
-   * @param rotation rotation
-   */
-  void SetRobotPose(units::meter_t x, units::meter_t y, Rotation2d rotation);
-
-  /**
-   * Get the robot pose.
-   *
-   * @return 2D pose
-   */
-  Pose2d GetRobotPose();
-
- private:
-  Pose2d m_pose;
-
-  hal::SimDevice m_device;
-  hal::SimDouble m_x;
-  hal::SimDouble m_y;
-  hal::SimDouble m_rot;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/FlywheelSim.h b/wpilibc/src/main/native/include/frc/simulation/FlywheelSim.h
index 1c47c45..9f2272c 100644
--- a/wpilibc/src/main/native/include/frc/simulation/FlywheelSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/FlywheelSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -21,7 +18,7 @@
 class FlywheelSim : public LinearSystemSim<1, 1, 1> {
  public:
   /**
-   * Creates a simulated flywhel mechanism.
+   * Creates a simulated flywheel mechanism.
    *
    * @param plant              The linear system representing the flywheel.
    * @param gearbox            The type of and number of motors in the flywheel
@@ -35,7 +32,7 @@
               const std::array<double, 1>& measurementStdDevs = {0.0});
 
   /**
-   * Creates a simulated flywhel mechanism.
+   * Creates a simulated flywheel mechanism.
    *
    * @param gearbox            The type of and number of motors in the flywheel
    *                           gearbox.
diff --git a/wpilibc/src/main/native/include/frc/simulation/GenericHIDSim.h b/wpilibc/src/main/native/include/frc/simulation/GenericHIDSim.h
index 1705200..399e0c1 100644
--- a/wpilibc/src/main/native/include/frc/simulation/GenericHIDSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/GenericHIDSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -41,30 +38,101 @@
    */
   void NotifyNewData();
 
+  /**
+   * Set the value of a given button.
+   *
+   * @param button the button to set
+   * @param value the new value
+   */
   void SetRawButton(int button, bool value);
 
+  /**
+   * Set the value of a given axis.
+   *
+   * @param axis the axis to set
+   * @param value the new value
+   */
   void SetRawAxis(int axis, double value);
 
+  /**
+   * Set the value of a given POV.
+   *
+   * @param pov the POV to set
+   * @param value the new value
+   */
   void SetPOV(int pov, int value);
 
+  /**
+   * Set the value of the default POV (port 0).
+   *
+   * @param value the new value
+   */
   void SetPOV(int value);
 
+  /**
+   * Set the axis count of this device.
+   *
+   * @param count the new axis count
+   */
   void SetAxisCount(int count);
 
+  /**
+   * Set the POV count of this device.
+   *
+   * @param count the new POV count
+   */
   void SetPOVCount(int count);
 
+  /**
+   * Set the button count of this device.
+   *
+   * @param count the new button count
+   */
   void SetButtonCount(int count);
 
+  /**
+   * Set the type of this device.
+   *
+   * @param type the new device type
+   */
   void SetType(GenericHID::HIDType type);
 
+  /**
+   * Set the name of this device.
+   *
+   * @param name the new device name
+   */
   void SetName(const char* name);
 
+  /**
+   * Set the type of an axis.
+   *
+   * @param axis the axis
+   * @param type the type
+   */
   void SetAxisType(int axis, int type);
 
+  /**
+   * Read the output of a button.
+   *
+   * @param outputNumber the button number
+   * @return the value of the button (true = pressed)
+   */
   bool GetOutput(int outputNumber);
 
+  /**
+   * Get the encoded 16-bit integer that passes button values.
+   *
+   * @return the button values
+   */
   int64_t GetOutputs();
 
+  /**
+   * Get the joystick rumble.
+   *
+   * @param type the rumble to read
+   * @return the rumble value
+   */
   double GetRumble(GenericHID::RumbleType type);
 
  protected:
diff --git a/wpilibc/src/main/native/include/frc/simulation/JoystickSim.h b/wpilibc/src/main/native/include/frc/simulation/JoystickSim.h
index 5735728..db573ad 100644
--- a/wpilibc/src/main/native/include/frc/simulation/JoystickSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/JoystickSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -34,18 +31,53 @@
    */
   explicit JoystickSim(int port);
 
+  /**
+   * Set the X value of the joystick.
+   *
+   * @param value the new X value
+   */
   void SetX(double value);
 
+  /**
+   * Set the Y value of the joystick.
+   *
+   * @param value the new Y value
+   */
   void SetY(double value);
 
+  /**
+   * Set the Z value of the joystick.
+   *
+   * @param value the new Z value
+   */
   void SetZ(double value);
 
+  /**
+   * Set the twist value of the joystick.
+   *
+   * @param value the new twist value
+   */
   void SetTwist(double value);
 
+  /**
+   * Set the throttle value of the joystick.
+   *
+   * @param value the new throttle value
+   */
   void SetThrottle(double value);
 
+  /**
+   * Set the trigger value of the joystick.
+   *
+   * @param state the new value
+   */
   void SetTrigger(bool state);
 
+  /**
+   * Set the top state of the joystick.
+   *
+   * @param state the new state
+   */
   void SetTop(bool state);
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/LinearSystemSim.h b/wpilibc/src/main/native/include/frc/simulation/LinearSystemSim.h
index 4f3c658..61cbd46 100644
--- a/wpilibc/src/main/native/include/frc/simulation/LinearSystemSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/LinearSystemSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -13,6 +10,7 @@
 #include <units/current.h>
 #include <units/time.h>
 
+#include "frc/RobotController.h"
 #include "frc/StateSpaceUtil.h"
 #include "frc/system/LinearSystem.h"
 
@@ -38,13 +36,13 @@
    * @param system             The system to simulate.
    * @param measurementStdDevs The standard deviations of the measurements.
    */
-  LinearSystemSim(const LinearSystem<States, Inputs, Outputs>& system,
-                  const std::array<double, Outputs>& measurementStdDevs =
-                      std::array<double, Outputs>{})
+  explicit LinearSystemSim(
+      const LinearSystem<States, Inputs, Outputs>& system,
+      const std::array<double, Outputs>& measurementStdDevs = {})
       : m_plant(system), m_measurementStdDevs(measurementStdDevs) {
-    m_x = Eigen::Matrix<double, States, 1>::Zero();
-    m_y = Eigen::Matrix<double, Outputs, 1>::Zero();
-    m_u = Eigen::Matrix<double, Inputs, 1>::Zero();
+    m_x = Eigen::Vector<double, States>::Zero();
+    m_y = Eigen::Vector<double, Outputs>::Zero();
+    m_u = Eigen::Vector<double, Inputs>::Zero();
   }
 
   /**
@@ -71,7 +69,7 @@
    *
    * @return The current output of the plant.
    */
-  const Eigen::Matrix<double, Outputs, 1>& GetOutput() const { return m_y; }
+  const Eigen::Vector<double, Outputs>& GetOutput() const { return m_y; }
 
   /**
    * Returns an element of the current output of the plant.
@@ -86,7 +84,7 @@
    *
    * @param u The system inputs.
    */
-  void SetInput(const Eigen::Matrix<double, Inputs, 1>& u) { m_u = u; }
+  void SetInput(const Eigen::Vector<double, Inputs>& u) { m_u = ClampInput(u); }
 
   /*
    * Sets the system inputs.
@@ -94,14 +92,17 @@
    * @param row   The row in the input matrix to set.
    * @param value The value to set the row to.
    */
-  void SetInput(int row, double value) { m_u(row, 0) = value; }
+  void SetInput(int row, double value) {
+    m_u(row, 0) = value;
+    ClampInput(m_u);
+  }
 
   /**
    * Sets the system state.
    *
    * @param state The new state.
    */
-  void SetState(const Eigen::Matrix<double, States, 1>& state) { m_x = state; }
+  void SetState(const Eigen::Vector<double, States>& state) { m_x = state; }
 
   /**
    * Returns the current drawn by this simulated system. Override this method to
@@ -121,17 +122,29 @@
    * @param u           The system inputs (usually voltage).
    * @param dt          The time difference between controller updates.
    */
-  virtual Eigen::Matrix<double, States, 1> UpdateX(
-      const Eigen::Matrix<double, States, 1>& currentXhat,
-      const Eigen::Matrix<double, Inputs, 1>& u, units::second_t dt) {
+  virtual Eigen::Vector<double, States> UpdateX(
+      const Eigen::Vector<double, States>& currentXhat,
+      const Eigen::Vector<double, Inputs>& u, units::second_t dt) {
     return m_plant.CalculateX(currentXhat, u, dt);
   }
 
+  /**
+   * Clamp the input vector such that no element exceeds the given voltage. If
+   * any does, the relative magnitudes of the input will be maintained.
+   *
+   * @param u          The input vector.
+   * @return The normalized input.
+   */
+  Eigen::Vector<double, Inputs> ClampInput(Eigen::Vector<double, Inputs> u) {
+    return frc::NormalizeInputVector<Inputs>(
+        u, frc::RobotController::GetInputVoltage());
+  }
+
   LinearSystem<States, Inputs, Outputs> m_plant;
 
-  Eigen::Matrix<double, States, 1> m_x;
-  Eigen::Matrix<double, Outputs, 1> m_y;
-  Eigen::Matrix<double, Inputs, 1> m_u;
+  Eigen::Vector<double, States> m_x;
+  Eigen::Vector<double, Outputs> m_y;
+  Eigen::Vector<double, Inputs> m_u;
   std::array<double, Outputs> m_measurementStdDevs;
 };
 }  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/Mechanism2D.h b/wpilibc/src/main/native/include/frc/simulation/Mechanism2D.h
deleted file mode 100644
index 3d61cf5..0000000
--- a/wpilibc/src/main/native/include/frc/simulation/Mechanism2D.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <map>
-#include <string>
-
-#include <hal/SimDevice.h>
-#include <wpi/StringMap.h>
-
-#include "frc/geometry/Pose2d.h"
-#include "frc/geometry/Rotation2d.h"
-
-namespace frc {
-class Mechanism2D {
- public:
-  Mechanism2D();
-
-  /**
-   * Set/Create the angle of a ligament
-   *
-   * @param ligamentPath json path to the ligament
-   * @param angle to set the ligament
-   */
-  void SetLigamentAngle(const wpi::Twine& ligamentPath, float angle);
-
-  /**
-   * Set/Create the length of a ligament
-   *
-   * @param ligamentPath json path to the ligament
-   * @param length to set the ligament
-   */
-  void SetLigamentLength(const wpi::Twine& ligamentPath, float length);
-
- private:
-  wpi::StringMap<hal::SimDouble> createdItems;
-  hal::SimDevice m_device;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/PCMSim.h b/wpilibc/src/main/native/include/frc/simulation/PCMSim.h
deleted file mode 100644
index 2e3ed5e..0000000
--- a/wpilibc/src/main/native/include/frc/simulation/PCMSim.h
+++ /dev/null
@@ -1,103 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-
-#include "frc/simulation/CallbackStore.h"
-
-namespace frc {
-
-class Compressor;
-
-namespace sim {
-
-/**
- * Class to control a simulated Pneumatic Control Module (PCM).
- */
-class PCMSim {
- public:
-  /**
-   * Constructs with the default PCM module number (CAN ID).
-   */
-  PCMSim();
-
-  /**
-   * Constructs from a PCM module number (CAN ID).
-   *
-   * @param module module number
-   */
-  explicit PCMSim(int module);
-
-  /**
-   * Constructs from a Compressor object.
-   *
-   * @param compressor Compressor connected to PCM to simulate
-   */
-  explicit PCMSim(const Compressor& compressor);
-
-  std::unique_ptr<CallbackStore> RegisterSolenoidInitializedCallback(
-      int channel, NotifyCallback callback, bool initialNotify);
-
-  bool GetSolenoidInitialized(int channel) const;
-
-  void SetSolenoidInitialized(int channel, bool solenoidInitialized);
-
-  std::unique_ptr<CallbackStore> RegisterSolenoidOutputCallback(
-      int channel, NotifyCallback callback, bool initialNotify);
-
-  bool GetSolenoidOutput(int channel) const;
-
-  void SetSolenoidOutput(int channel, bool solenoidOutput);
-
-  std::unique_ptr<CallbackStore> RegisterCompressorInitializedCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  bool GetCompressorInitialized() const;
-
-  void SetCompressorInitialized(bool compressorInitialized);
-
-  std::unique_ptr<CallbackStore> RegisterCompressorOnCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  bool GetCompressorOn() const;
-
-  void SetCompressorOn(bool compressorOn);
-
-  std::unique_ptr<CallbackStore> RegisterClosedLoopEnabledCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  bool GetClosedLoopEnabled() const;
-
-  void SetClosedLoopEnabled(bool closedLoopEnabled);
-
-  std::unique_ptr<CallbackStore> RegisterPressureSwitchCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  bool GetPressureSwitch() const;
-
-  void SetPressureSwitch(bool pressureSwitch);
-
-  std::unique_ptr<CallbackStore> RegisterCompressorCurrentCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  double GetCompressorCurrent() const;
-
-  void SetCompressorCurrent(double compressorCurrent);
-
-  uint8_t GetAllSolenoidOutputs() const;
-
-  void SetAllSolenoidOutputs(uint8_t outputs);
-
-  void ResetData();
-
- private:
-  int m_index;
-};
-}  // namespace sim
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/PDPSim.h b/wpilibc/src/main/native/include/frc/simulation/PDPSim.h
deleted file mode 100644
index c67815f..0000000
--- a/wpilibc/src/main/native/include/frc/simulation/PDPSim.h
+++ /dev/null
@@ -1,77 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-
-#include "frc/simulation/CallbackStore.h"
-
-namespace frc {
-
-class PowerDistributionPanel;
-
-namespace sim {
-
-/**
- * Class to control a simulated Power Distribution Panel (PDP).
- */
-class PDPSim {
- public:
-  /**
-   * Constructs from a PDP module number (CAN ID).
-   *
-   * @param module module number
-   */
-  explicit PDPSim(int module = 0);
-
-  /**
-   * Constructs from a PowerDistributionPanel object.
-   *
-   * @param pdp PowerDistributionPanel to simulate
-   */
-  explicit PDPSim(const PowerDistributionPanel& pdp);
-
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  bool GetInitialized() const;
-
-  void SetInitialized(bool initialized);
-
-  std::unique_ptr<CallbackStore> RegisterTemperatureCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  double GetTemperature() const;
-
-  void SetTemperature(double temperature);
-
-  std::unique_ptr<CallbackStore> RegisterVoltageCallback(
-      NotifyCallback callback, bool initialNotify);
-
-  double GetVoltage() const;
-
-  void SetVoltage(double voltage);
-
-  std::unique_ptr<CallbackStore> RegisterCurrentCallback(
-      int channel, NotifyCallback callback, bool initialNotify);
-
-  double GetCurrent(int channel) const;
-
-  void SetCurrent(int channel, double current);
-
-  void GetAllCurrents(double* currents) const;
-
-  void SetAllCurrents(const double* currents);
-
-  void ResetData();
-
- private:
-  int m_index;
-};
-}  // namespace sim
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/PS4ControllerSim.h b/wpilibc/src/main/native/include/frc/simulation/PS4ControllerSim.h
new file mode 100644
index 0000000..a599ad9
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/PS4ControllerSim.h
@@ -0,0 +1,176 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include "frc/simulation/GenericHIDSim.h"
+
+namespace frc {
+
+class PS4Controller;
+
+namespace sim {
+
+/**
+ * Class to control a simulated PS4 controller.
+ */
+class PS4ControllerSim : public GenericHIDSim {
+ public:
+  /**
+   * Constructs from a PS4Controller object.
+   *
+   * @param joystick controller to simulate
+   */
+  explicit PS4ControllerSim(const PS4Controller& joystick);
+
+  /**
+   * Constructs from a joystick port number.
+   *
+   * @param port port number
+   */
+  explicit PS4ControllerSim(int port);
+
+  /**
+   * Change the X axis value of the controller's left stick.
+   *
+   * @param value the new value
+   */
+  void SetLeftX(double value);
+
+  /**
+   * Change the X axis value of the controller's right stick.
+   *
+   * @param value the new value
+   */
+  void SetRightX(double value);
+
+  /**
+   * Change the Y axis value of the controller's left stick.
+   *
+   * @param value the new value
+   */
+  void SetLeftY(double value);
+
+  /**
+   * Change the Y axis value of the controller's right stick.
+   *
+   * @param value the new value
+   */
+  void SetRightY(double value);
+
+  /**
+   * Change the L2 axis axis value of the controller.
+   *
+   * @param value the new value
+   */
+  void SetL2Axis(double value);
+
+  /**
+   * Change the R2 axis value of the controller.
+   *
+   * @param value the new value
+   */
+  void SetR2Axis(double value);
+
+  /**
+   * Change the value of the Square button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetSquareButton(bool value);
+
+  /**
+   * Change the value of the Cross button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetCrossButton(bool value);
+
+  /**
+   * Change the value of the Circle button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetCircleButton(bool value);
+
+  /**
+   * Change the value of the Triangle button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetTriangleButton(bool value);
+
+  /**
+   * Change the value of the L1 button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetL1Button(bool value);
+
+  /**
+   * Change the value of the R1 button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetR1Button(bool value);
+
+  /**
+   * Change the value of the L2 button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetL2Button(bool value);
+
+  /**
+   * Change the value of the R2 button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetR2Button(bool value);
+
+  /**
+   * Change the value of the Share button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetShareButton(bool value);
+
+  /**
+   * Change the value of the Options button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetOptionsButton(bool value);
+
+  /**
+   * Change the value of the L3 (left stick) button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetL3Button(bool value);
+
+  /**
+   * Change the value of the R3 (right stick) button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetR3Button(bool value);
+
+  /**
+   * Change the value of the PS button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetPSButton(bool value);
+
+  /**
+   * Change the value of the touchpad button on the controller.
+   *
+   * @param value the new value
+   */
+  void SetTouchpad(bool value);
+};
+
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/PWMSim.h b/wpilibc/src/main/native/include/frc/simulation/PWMSim.h
index ca2dfca..97e9b1f 100644
--- a/wpilibc/src/main/native/include/frc/simulation/PWMSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/PWMSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,48 +33,153 @@
    */
   explicit PWMSim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+  /**
+   * Register a callback to be run when the PWM is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the PWM has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitialized() const;
 
+  /**
+   * Define whether the PWM has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
   void SetInitialized(bool initialized);
 
-  std::unique_ptr<CallbackStore> RegisterRawValueCallback(
+  /**
+   * Register a callback to be run when the PWM raw value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterRawValueCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the PWM raw value.
+   *
+   * @return the PWM raw value
+   */
   int GetRawValue() const;
 
+  /**
+   * Set the PWM raw value.
+   *
+   * @param rawValue the PWM raw value
+   */
   void SetRawValue(int rawValue);
 
-  std::unique_ptr<CallbackStore> RegisterSpeedCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback to be run when the PWM speed changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterSpeedCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the PWM speed.
+   *
+   * @return the PWM speed (-1.0 to 1.0)
+   */
   double GetSpeed() const;
 
+  /**
+   * Set the PWM speed.
+   *
+   * @param speed the PWM speed (-1.0 to 1.0)
+   */
   void SetSpeed(double speed);
 
-  std::unique_ptr<CallbackStore> RegisterPositionCallback(
+  /**
+   * Register a callback to be run when the PWM position changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPositionCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the PWM position.
+   *
+   * @return the PWM position (0.0 to 1.0)
+   */
   double GetPosition() const;
 
+  /**
+   * Set the PWM position.
+   *
+   * @param position the PWM position (0.0 to 1.0)
+   */
   void SetPosition(double position);
 
-  std::unique_ptr<CallbackStore> RegisterPeriodScaleCallback(
+  /**
+   * Register a callback to be run when the PWM period scale changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPeriodScaleCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the PWM period scale.
+   *
+   * @return the PWM period scale
+   */
   int GetPeriodScale() const;
 
+  /**
+   * Set the PWM period scale.
+   *
+   * @param periodScale the PWM period scale
+   */
   void SetPeriodScale(int periodScale);
 
-  std::unique_ptr<CallbackStore> RegisterZeroLatchCallback(
+  /**
+   * Register a callback to be run when the PWM zero latch state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterZeroLatchCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the PWM is zero latched.
+   *
+   * @return true if zero latched
+   */
   bool GetZeroLatch() const;
 
+  /**
+   * Define whether the PWM has been zero latched.
+   *
+   * @param zeroLatch true to indicate zero latched
+   */
   void SetZeroLatch(bool zeroLatch);
 
+  /**
+   * Reset all simulation data.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/PowerDistributionSim.h b/wpilibc/src/main/native/include/frc/simulation/PowerDistributionSim.h
new file mode 100644
index 0000000..ac54da2
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/PowerDistributionSim.h
@@ -0,0 +1,167 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include "frc/simulation/CallbackStore.h"
+
+namespace frc {
+
+class PowerDistribution;
+
+namespace sim {
+
+/**
+ * Class to control a simulated Power Distribution Panel (PowerDistribution).
+ */
+class PowerDistributionSim {
+ public:
+  /**
+   * Constructs from a PowerDistribution module number (CAN ID).
+   *
+   * @param module module number
+   */
+  explicit PowerDistributionSim(int module = 0);
+
+  /**
+   * Constructs from a PowerDistribution object.
+   *
+   * @param pdp PowerDistribution to simulate
+   */
+  explicit PowerDistributionSim(const PowerDistribution& pdp);
+
+  /**
+   * Register a callback to be run when the PowerDistribution is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check whether the PowerDistribution has been initialized.
+   *
+   * @return true if initialized
+   */
+  bool GetInitialized() const;
+
+  /**
+   * Define whether the PowerDistribution has been initialized.
+   *
+   * @param initialized whether this object is initialized
+   */
+  void SetInitialized(bool initialized);
+
+  /**
+   * Register a callback to be run whenever the PowerDistribution temperature
+   * changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterTemperatureCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the temperature of the PowerDistribution.
+   *
+   * @return the PowerDistribution temperature
+   */
+  double GetTemperature() const;
+
+  /**
+   * Define the PowerDistribution temperature.
+   *
+   * @param temperature the new PowerDistribution temperature
+   */
+  void SetTemperature(double temperature);
+
+  /**
+   * Register a callback to be run whenever the PowerDistribution voltage
+   * changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterVoltageCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the PowerDistribution voltage.
+   *
+   * @return the PowerDistribution voltage.
+   */
+  double GetVoltage() const;
+
+  /**
+   * Set the PowerDistribution voltage.
+   *
+   * @param voltage the new PowerDistribution voltage
+   */
+  void SetVoltage(double voltage);
+
+  /**
+   * Register a callback to be run whenever the current of a specific channel
+   * changes.
+   *
+   * @param channel the channel
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterCurrentCallback(
+      int channel, NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Read the current in one of the PowerDistribution channels.
+   *
+   * @param channel the channel to check
+   * @return the current in the given channel
+   */
+  double GetCurrent(int channel) const;
+
+  /**
+   * Change the current in the given channel.
+   *
+   * @param channel the channel to edit
+   * @param current the new current for the channel
+   */
+  void SetCurrent(int channel, double current);
+
+  /**
+   * Read the current of all of the PowerDistribution channels.
+   *
+   * @param currents output array; set to the current in each channel. The
+   *                 array must be big enough to hold all the PowerDistribution
+   *                 channels
+   * @param length   length of output array
+   */
+  void GetAllCurrents(double* currents, int length) const;
+
+  /**
+   * Change the current in all of the PowerDistribution channels.
+   *
+   * @param currents array containing the current values for each channel. The
+   *                 array must be big enough to hold all the PowerDistribution
+   *                 channels
+   * @param length   length of array
+   */
+  void SetAllCurrents(const double* currents, int length);
+
+  /**
+   * Reset all PowerDistribution simulation data.
+   */
+  void ResetData();
+
+ private:
+  int m_index;
+};
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/REVPHSim.h b/wpilibc/src/main/native/include/frc/simulation/REVPHSim.h
new file mode 100644
index 0000000..97e31bf
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/REVPHSim.h
@@ -0,0 +1,212 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include "frc/PneumaticsBase.h"
+#include "frc/simulation/CallbackStore.h"
+
+namespace frc {
+
+class Compressor;
+
+namespace sim {
+
+/**
+ * Class to control a simulated Pneumatic Control Module (PCM).
+ */
+class REVPHSim {
+ public:
+  /**
+   * Constructs with the default PCM module number (CAN ID).
+   */
+  REVPHSim();
+
+  /**
+   * Constructs from a PCM module number (CAN ID).
+   *
+   * @param module module number
+   */
+  explicit REVPHSim(int module);
+
+  explicit REVPHSim(const PneumaticsBase& pneumatics);
+
+  /**
+   * Register a callback to be run when a solenoid is initialized on a channel.
+   *
+   * @param callback the callback
+   * @param initialNotify should the callback be run with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if a solenoid has been initialized on a specific channel.
+   *
+   * @return true if initialized
+   */
+  bool GetInitialized() const;
+
+  /**
+   * Define whether a solenoid has been initialized on a specific channel.
+   *
+   * @param solenoidInitialized is there a solenoid initialized on that channel
+   */
+  void SetInitialized(bool solenoidInitialized);
+
+  /**
+   * Register a callback to be run when the solenoid output on a channel
+   * changes.
+   *
+   * @param channel the channel to monitor
+   * @param callback the callback
+   * @param initialNotify should the callback be run with the initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterSolenoidOutputCallback(
+      int channel, NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the solenoid output on a specific channel.
+   *
+   * @param channel the channel to check
+   * @return the solenoid output
+   */
+  bool GetSolenoidOutput(int channel) const;
+
+  /**
+   * Change the solenoid output on a specific channel.
+   *
+   * @param channel the channel to check
+   * @param solenoidOutput the new solenoid output
+   */
+  void SetSolenoidOutput(int channel, bool solenoidOutput);
+
+  /**
+   * Register a callback to be run when the compressor activates.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterCompressorOnCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check if the compressor is on.
+   *
+   * @return true if the compressor is active
+   */
+  bool GetCompressorOn() const;
+
+  /**
+   * Set whether the compressor is active.
+   *
+   * @param compressorOn the new value
+   */
+  void SetCompressorOn(bool compressorOn);
+
+  /**
+   * Register a callback to be run whenever the closed loop state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterClosedLoopEnabledCallback(NotifyCallback callback,
+                                    bool initialNotify);
+
+  /**
+   * Check whether the closed loop compressor control is active.
+   *
+   * @return true if active
+   */
+  bool GetClosedLoopEnabled() const;
+
+  /**
+   * Turn on/off the closed loop control of the compressor.
+   *
+   * @param closedLoopEnabled whether the control loop is active
+   */
+  void SetClosedLoopEnabled(bool closedLoopEnabled);
+
+  /**
+   * Register a callback to be run whenever the pressure switch value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterPressureSwitchCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Check the value of the pressure switch.
+   *
+   * @return the pressure switch value
+   */
+  bool GetPressureSwitch() const;
+
+  /**
+   * Set the value of the pressure switch.
+   *
+   * @param pressureSwitch the new value
+   */
+  void SetPressureSwitch(bool pressureSwitch);
+
+  /**
+   * Register a callback to be run whenever the compressor current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterCompressorCurrentCallback(NotifyCallback callback,
+                                    bool initialNotify);
+
+  /**
+   * Read the compressor current.
+   *
+   * @return the current of the compressor connected to this module
+   */
+  double GetCompressorCurrent() const;
+
+  /**
+   * Set the compressor current.
+   *
+   * @param compressorCurrent the new compressor current
+   */
+  void SetCompressorCurrent(double compressorCurrent);
+
+  /**
+   * Get the current value of all solenoid outputs.
+   *
+   * @return the solenoid outputs (1 bit per output)
+   */
+  uint8_t GetAllSolenoidOutputs() const;
+
+  /**
+   * Change all of the solenoid outputs.
+   *
+   * @param outputs the new solenoid outputs (1 bit per output)
+   */
+  void SetAllSolenoidOutputs(uint8_t outputs);
+
+  /**
+   * Reset all simulation data for this object.
+   */
+  void ResetData();
+
+ private:
+  int m_index;
+};
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/RelaySim.h b/wpilibc/src/main/native/include/frc/simulation/RelaySim.h
index 99a8eef..5034885 100644
--- a/wpilibc/src/main/native/include/frc/simulation/RelaySim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/RelaySim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -36,34 +33,107 @@
    */
   explicit RelaySim(int channel);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedForwardCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run when the forward direction is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterInitializedForwardCallback(NotifyCallback callback,
+                                     bool initialNotify);
 
+  /**
+   * Check whether the forward direction has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitializedForward() const;
 
+  /**
+   * Define whether the forward direction has been initialized.
+   *
+   * @param initializedForward whether this object is initialized
+   */
   void SetInitializedForward(bool initializedForward);
 
-  std::unique_ptr<CallbackStore> RegisterInitializedReverseCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run when the reverse direction is initialized.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore>
+  RegisterInitializedReverseCallback(NotifyCallback callback,
+                                     bool initialNotify);
 
+  /**
+   * Check whether the reverse direction has been initialized.
+   *
+   * @return true if initialized
+   */
   bool GetInitializedReverse() const;
 
+  /**
+   * Define whether the reverse direction has been initialized.
+   *
+   * @param initializedReverse whether this object is initialized
+   */
   void SetInitializedReverse(bool initializedReverse);
 
-  std::unique_ptr<CallbackStore> RegisterForwardCallback(
+  /**
+   * Register a callback to be run when the forward direction changes state.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterForwardCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the forward direction is active.
+   *
+   * @return true if active
+   */
   bool GetForward() const;
 
+  /**
+   * Set whether the forward direction is active.
+   *
+   * @param forward true to make active
+   */
   void SetForward(bool forward);
 
-  std::unique_ptr<CallbackStore> RegisterReverseCallback(
+  /**
+   * Register a callback to be run when the reverse direction changes state.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterReverseCallback(
       NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the reverse direction is active.
+   *
+   * @return true if active
+   */
   bool GetReverse() const;
 
+  /**
+   * Set whether the reverse direction is active.
+   *
+   * @param reverse true to make active
+   */
   void SetReverse(bool reverse);
 
+  /**
+   * Reset all simulation data.
+   */
   void ResetData();
 
  private:
diff --git a/wpilibc/src/main/native/include/frc/simulation/RoboRioSim.h b/wpilibc/src/main/native/include/frc/simulation/RoboRioSim.h
index 32eb462..1095106 100644
--- a/wpilibc/src/main/native/include/frc/simulation/RoboRioSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/RoboRioSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -14,120 +11,416 @@
 
 #include "frc/simulation/CallbackStore.h"
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
 /**
- * Class to control a simulated RoboRIO.
+ * A utility class to control a simulated RoboRIO.
  */
 class RoboRioSim {
  public:
-  static std::unique_ptr<CallbackStore> RegisterFPGAButtonCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run when the FPGA button state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterFPGAButtonCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Query the state of the FPGA button.
+   *
+   * @return the FPGA button state
+   */
   static bool GetFPGAButton();
 
+  /**
+   * Define the state of the FPGA button.
+   *
+   * @param fPGAButton the new state
+   */
   static void SetFPGAButton(bool fPGAButton);
 
-  static std::unique_ptr<CallbackStore> RegisterVInVoltageCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Vin voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterVInVoltageCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Vin voltage.
+   *
+   * @return the Vin voltage
+   */
   static units::volt_t GetVInVoltage();
 
+  /**
+   * Define the Vin voltage.
+   *
+   * @param vInVoltage the new voltage
+   */
   static void SetVInVoltage(units::volt_t vInVoltage);
 
-  static std::unique_ptr<CallbackStore> RegisterVInCurrentCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Vin current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterVInCurrentCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Vin current.
+   *
+   * @return the Vin current
+   */
   static units::ampere_t GetVInCurrent();
 
+  /**
+   * Define the Vin current.
+   *
+   * @param vInCurrent the new current
+   */
   static void SetVInCurrent(units::ampere_t vInCurrent);
 
-  static std::unique_ptr<CallbackStore> RegisterUserVoltage6VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 6V rail voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserVoltage6VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 6V rail voltage.
+   *
+   * @return the 6V rail voltage
+   */
   static units::volt_t GetUserVoltage6V();
 
+  /**
+   * Define the 6V rail voltage.
+   *
+   * @param userVoltage6V the new voltage
+   */
   static void SetUserVoltage6V(units::volt_t userVoltage6V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserCurrent6VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 6V rail current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserCurrent6VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 6V rail current.
+   *
+   * @return the 6V rail current
+   */
   static units::ampere_t GetUserCurrent6V();
 
+  /**
+   * Define the 6V rail current.
+   *
+   * @param userCurrent6V the new current
+   */
   static void SetUserCurrent6V(units::ampere_t userCurrent6V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserActive6VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 6V rail active state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserActive6VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 6V rail active state.
+   *
+   * @return true if the 6V rail is active
+   */
   static bool GetUserActive6V();
 
+  /**
+   * Set the 6V rail active state.
+   *
+   * @param userActive6V true to make rail active
+   */
   static void SetUserActive6V(bool userActive6V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserVoltage5VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 5V rail voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserVoltage5VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 5V rail voltage.
+   *
+   * @return the 5V rail voltage
+   */
   static units::volt_t GetUserVoltage5V();
 
+  /**
+   * Define the 5V rail voltage.
+   *
+   * @param userVoltage5V the new voltage
+   */
   static void SetUserVoltage5V(units::volt_t userVoltage5V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserCurrent5VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 5V rail current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserCurrent5VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 5V rail current.
+   *
+   * @return the 5V rail current
+   */
   static units::ampere_t GetUserCurrent5V();
 
+  /**
+   * Define the 5V rail current.
+   *
+   * @param userCurrent5V the new current
+   */
   static void SetUserCurrent5V(units::ampere_t userCurrent5V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserActive5VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 5V rail active state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserActive5VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 5V rail active state.
+   *
+   * @return true if the 5V rail is active
+   */
   static bool GetUserActive5V();
 
+  /**
+   * Set the 5V rail active state.
+   *
+   * @param userActive5V true to make rail active
+   */
   static void SetUserActive5V(bool userActive5V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserVoltage3V3Callback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 3.3V rail voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserVoltage3V3Callback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 3.3V rail voltage.
+   *
+   * @return the 3.3V rail voltage
+   */
   static units::volt_t GetUserVoltage3V3();
 
+  /**
+   * Define the 3.3V rail voltage.
+   *
+   * @param userVoltage3V3 the new voltage
+   */
   static void SetUserVoltage3V3(units::volt_t userVoltage3V3);
 
-  static std::unique_ptr<CallbackStore> RegisterUserCurrent3V3Callback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 3.3V rail current changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserCurrent3V3Callback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the 3.3V rail current.
+   *
+   * @return the 3.3V rail current
+   */
   static units::ampere_t GetUserCurrent3V3();
 
+  /**
+   * Define the 3.3V rail current.
+   *
+   * @param userCurrent3V3 the new current
+   */
   static void SetUserCurrent3V3(units::ampere_t userCurrent3V3);
 
-  static std::unique_ptr<CallbackStore> RegisterUserActive3V3Callback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 3.3V rail active state changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserActive3V3Callback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 3.3V rail active state.
+   *
+   * @return true if the 3.3V rail is active
+   */
   static bool GetUserActive3V3();
 
+  /**
+   * Set the 3.3V rail active state.
+   *
+   * @param userActive3V3 true to make rail active
+   */
   static void SetUserActive3V3(bool userActive3V3);
 
-  static std::unique_ptr<CallbackStore> RegisterUserFaults6VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 6V rail number of faults
+   * changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserFaults6VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 6V rail number of faults.
+   *
+   * @return number of faults
+   */
   static int GetUserFaults6V();
 
+  /**
+   * Set the 6V rail number of faults.
+   *
+   * @param userFaults6V number of faults
+   */
   static void SetUserFaults6V(int userFaults6V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserFaults5VCallback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 5V rail number of faults
+   * changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserFaults5VCallback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 5V rail number of faults.
+   *
+   * @return number of faults
+   */
   static int GetUserFaults5V();
 
+  /**
+   * Set the 5V rail number of faults.
+   *
+   * @param userFaults5V number of faults
+   */
   static void SetUserFaults5V(int userFaults5V);
 
-  static std::unique_ptr<CallbackStore> RegisterUserFaults3V3Callback(
-      NotifyCallback callback, bool initialNotify);
+  /**
+   * Register a callback to be run whenever the 3.3V rail number of faults
+   * changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether the callback should be called with the
+   *                      initial value
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterUserFaults3V3Callback(NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Get the 3.3V rail number of faults.
+   *
+   * @return number of faults
+   */
   static int GetUserFaults3V3();
 
+  /**
+   * Set the 3.3V rail number of faults.
+   *
+   * @param userFaults3V3 number of faults
+   */
   static void SetUserFaults3V3(int userFaults3V3);
 
+  /**
+   * Register a callback to be run whenever the brownout voltage changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] static std::unique_ptr<CallbackStore>
+  RegisterBrownoutVoltageCallback(NotifyCallback callback, bool initialNotify);
+
+  /**
+   * Measure the brownout voltage.
+   *
+   * @return the brownout voltage
+   */
+  static units::volt_t GetBrownoutVoltage();
+
+  /**
+   * Define the brownout voltage.
+   *
+   * @param brownoutVoltage the new voltage
+   */
+  static void SetBrownoutVoltage(units::volt_t brownoutVoltage);
+
+  /**
+   * Reset all simulation data.
+   */
   static void ResetData();
 };
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/SPIAccelerometerSim.h b/wpilibc/src/main/native/include/frc/simulation/SPIAccelerometerSim.h
index f2e3249..9d31bd0 100644
--- a/wpilibc/src/main/native/include/frc/simulation/SPIAccelerometerSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/SPIAccelerometerSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -11,51 +8,142 @@
 
 #include "frc/simulation/CallbackStore.h"
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 class SPIAccelerometerSim {
  public:
+  /**
+   * Construct a new simulation object.
+   *
+   * @param index the HAL index of the accelerometer
+   */
   explicit SPIAccelerometerSim(int index);
 
-  std::unique_ptr<CallbackStore> RegisterActiveCallback(NotifyCallback callback,
-                                                        bool initialNotify);
+  /**
+   * Register a callback to be run when this accelerometer activates.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterActiveCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check whether the accelerometer is active.
+   *
+   * @return true if active
+   */
   bool GetActive() const;
 
+  /**
+   * Define whether this accelerometer is active.
+   *
+   * @param active the new state
+   */
   void SetActive(bool active);
 
-  std::unique_ptr<CallbackStore> RegisterRangeCallback(NotifyCallback callback,
-                                                       bool initialNotify);
+  /**
+   * Register a callback to be run whenever the range changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterRangeCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Check the range of this accelerometer.
+   *
+   * @return the accelerometer range
+   */
   int GetRange() const;
 
+  /**
+   * Change the range of this accelerometer.
+   *
+   * @param range the new accelerometer range
+   */
   void SetRange(int range);
 
-  std::unique_ptr<CallbackStore> RegisterXCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the X axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterXCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the X axis value.
+   *
+   * @return the X axis measurement
+   */
   double GetX() const;
 
+  /**
+   * Change the X axis value of the accelerometer.
+   *
+   * @param x the new reading of the X axis
+   */
   void SetX(double x);
 
-  std::unique_ptr<CallbackStore> RegisterYCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Y axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterYCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Y axis value.
+   *
+   * @return the Y axis measurement
+   */
   double GetY() const;
 
+  /**
+   * Change the Y axis value of the accelerometer.
+   *
+   * @param y the new reading of the Y axis
+   */
   void SetY(double y);
 
-  std::unique_ptr<CallbackStore> RegisterZCallback(NotifyCallback callback,
-                                                   bool initialNotify);
+  /**
+   * Register a callback to be run whenever the Z axis value changes.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to call the callback with the initial state
+   * @return the CallbackStore object associated with this callback
+   */
+  [[nodiscard]] std::unique_ptr<CallbackStore> RegisterZCallback(
+      NotifyCallback callback, bool initialNotify);
 
+  /**
+   * Measure the Z axis value.
+   *
+   * @return the Z axis measurement
+   */
   double GetZ() const;
 
+  /**
+   * Change the Z axis value of the accelerometer.
+   *
+   * @param z the new reading of the Z axis
+   */
   void SetZ(double z);
 
+  /**
+   * Reset all simulation data of this object.
+   */
   void ResetData();
 
  private:
   int m_index;
 };
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/SimDeviceSim.h b/wpilibc/src/main/native/include/frc/simulation/SimDeviceSim.h
index 640cc0e..0a4e4d8 100644
--- a/wpilibc/src/main/native/include/frc/simulation/SimDeviceSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/SimDeviceSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -14,8 +11,7 @@
 #include <hal/SimDevice.h>
 #include <hal/simulation/SimDeviceData.h>
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
 /**
  * Class to control the simulation side of a SimDevice.
@@ -29,28 +25,109 @@
    */
   explicit SimDeviceSim(const char* name);
 
+  /**
+   * Constructs a SimDeviceSim.
+   *
+   * @param name name of the SimDevice
+   * @param index device index number to append to name
+   */
+  SimDeviceSim(const char* name, int index);
+
+  /**
+   * Constructs a SimDeviceSim.
+   *
+   * @param name name of the SimDevice
+   * @param index device index number to append to name
+   * @param channel device channel number to append to name
+   */
+  SimDeviceSim(const char* name, int index, int channel);
+
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
   hal::SimValue GetValue(const char* name) const;
 
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
+  hal::SimInt GetInt(const char* name) const;
+
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
+  hal::SimLong GetLong(const char* name) const;
+
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
   hal::SimDouble GetDouble(const char* name) const;
 
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
   hal::SimEnum GetEnum(const char* name) const;
 
+  /**
+   * Get the property object with the given name.
+   *
+   * @param name the property name
+   * @return the property object
+   */
   hal::SimBoolean GetBoolean(const char* name) const;
 
+  /**
+   * Get all options for the given enum.
+   *
+   * @param val the enum
+   * @return names of the different values for that enum
+   */
   static std::vector<std::string> GetEnumOptions(hal::SimEnum val);
 
+  /**
+   * Get all properties.
+   *
+   * @param callback callback called for each property (SimValue).  Signature
+   *                 of the callback must be const char*, HAL_SimValueHandle,
+   *                 int, const HAL_Value*
+   */
   template <typename F>
   void EnumerateValues(F callback) const {
     return HALSIM_EnumerateSimValues(
         m_handle, &callback,
         [](const char* name, void* param, HAL_SimValueHandle handle,
-           HAL_Bool readonly, const struct HAL_Value* value) {
-          std::invoke(*static_cast<F*>(param), name, handle, readonly, value);
+           int direction, const struct HAL_Value* value) {
+          std::invoke(*static_cast<F*>(param), name, handle, direction, value);
         });
   }
 
-  operator HAL_SimDeviceHandle() const { return m_handle; }
+  /**
+   * Get the raw handle of this object.
+   *
+   * @return the handle used to refer to this object
+   */
+  operator HAL_SimDeviceHandle() const { return m_handle; }  // NOLINT
 
+  /**
+   * Get all sim devices with the given prefix.
+   *
+   * @param prefix the prefix to filter sim devices
+   * @param callback callback function to call for each sim device
+   */
   template <typename F>
   static void EnumerateDevices(const char* prefix, F callback) {
     return HALSIM_EnumerateSimDevices(
@@ -60,10 +137,12 @@
         });
   }
 
+  /**
+   * Reset all SimDevice data.
+   */
   static void ResetData();
 
  private:
   HAL_SimDeviceHandle m_handle;
 };
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/SimHooks.h b/wpilibc/src/main/native/include/frc/simulation/SimHooks.h
index 7690a4f..5d8a6b4 100644
--- a/wpilibc/src/main/native/include/frc/simulation/SimHooks.h
+++ b/wpilibc/src/main/native/include/frc/simulation/SimHooks.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -12,9 +9,13 @@
 #include <hal/HALBase.h>
 #include <units/time.h>
 
-namespace frc {
-namespace sim {
+namespace frc::sim {
 
+/**
+ * Override the HAL runtime type (simulated/real).
+ *
+ * @param type runtime type
+ */
 void SetRuntimeType(HAL_RuntimeType type);
 
 void WaitForProgramStart();
@@ -23,17 +24,40 @@
 
 bool GetProgramStarted();
 
+/**
+ * Restart the simulator time.
+ */
 void RestartTiming();
 
+/**
+ * Pause the simulator time.
+ */
 void PauseTiming();
 
+/**
+ * Resume the simulator time.
+ */
 void ResumeTiming();
 
+/**
+ * Check if the simulator time is paused.
+ *
+ * @return true if paused
+ */
 bool IsTimingPaused();
 
+/**
+ * Advance the simulator time and wait for all notifiers to run.
+ *
+ * @param delta the amount to advance (in seconds)
+ */
 void StepTiming(units::second_t delta);
 
+/**
+ * Advance the simulator time and return immediately.
+ *
+ * @param delta the amount to advance (in seconds)
+ */
 void StepTimingAsync(units::second_t delta);
 
-}  // namespace sim
-}  // namespace frc
+}  // namespace frc::sim
diff --git a/wpilibc/src/main/native/include/frc/simulation/SingleJointedArmSim.h b/wpilibc/src/main/native/include/frc/simulation/SingleJointedArmSim.h
index f8de822..4ff29cc 100644
--- a/wpilibc/src/main/native/include/frc/simulation/SingleJointedArmSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/SingleJointedArmSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -66,20 +63,34 @@
                       const std::array<double, 1>& measurementStdDevs = {0.0});
 
   /**
+   * Returns whether the arm would hit the lower limit.
+   *
+   * @param armAngle The arm height.
+   * @return Whether the arm would hit the lower limit.
+   */
+  bool WouldHitLowerLimit(units::radian_t armAngle) const;
+
+  /**
+   * Returns whether the arm would hit the upper limit.
+   *
+   * @param armAngle The arm height.
+   * @return Whether the arm would hit the upper limit.
+   */
+  bool WouldHitUpperLimit(units::radian_t armAngle) const;
+
+  /**
    * Returns whether the arm has hit the lower limit.
    *
-   * @param x The current arm state.
    * @return Whether the arm has hit the lower limit.
    */
-  bool HasHitLowerLimit(const Eigen::Matrix<double, 2, 1>& x) const;
+  bool HasHitLowerLimit() const;
 
   /**
    * Returns whether the arm has hit the upper limit.
    *
-   * @param x The current arm state.
    * @return Whether the arm has hit the upper limit.
    */
-  bool HasHitUpperLimit(const Eigen::Matrix<double, 2, 1>& x) const;
+  bool HasHitUpperLimit() const;
 
   /**
    * Returns the current arm angle.
@@ -103,7 +114,7 @@
   units::ampere_t GetCurrentDraw() const override;
 
   /**
-   * Sets the input voltage for the elevator.
+   * Sets the input voltage for the arm.
    *
    * @param voltage The input voltage.
    */
@@ -131,9 +142,9 @@
    * @param u           The system inputs (voltage).
    * @param dt          The time difference between controller updates.
    */
-  Eigen::Matrix<double, 2, 1> UpdateX(
-      const Eigen::Matrix<double, 2, 1>& currentXhat,
-      const Eigen::Matrix<double, 1, 1>& u, units::second_t dt) override;
+  Eigen::Vector<double, 2> UpdateX(const Eigen::Vector<double, 2>& currentXhat,
+                                   const Eigen::Vector<double, 1>& u,
+                                   units::second_t dt) override;
 
  private:
   units::meter_t m_r;
diff --git a/wpilibc/src/main/native/include/frc/simulation/UltrasonicSim.h b/wpilibc/src/main/native/include/frc/simulation/UltrasonicSim.h
new file mode 100644
index 0000000..efa9b37
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/simulation/UltrasonicSim.h
@@ -0,0 +1,48 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <hal/SimDevice.h>
+#include <units/length.h>
+
+namespace frc {
+
+class Ultrasonic;
+
+namespace sim {
+
+/**
+ * Class to control a simulated ADXRS450 gyroscope.
+ */
+class UltrasonicSim {
+ public:
+  /**
+   * Constructs from a ADXRS450_Gyro object.
+   *
+   * @param gyro ADXRS450_Gyro to simulate
+   */
+  explicit UltrasonicSim(const Ultrasonic& gyro);
+
+  /**
+   * Sets if the range measurement is valid.
+   *
+   * @param isValid True if valid
+   */
+  void SetRangeValid(bool isValid);
+
+  /**
+   * Sets the range measurement
+   *
+   * @param range The range
+   */
+  void SetRange(units::meter_t range);
+
+ private:
+  hal::SimBoolean m_simRangeValid;
+  hal::SimDouble m_simRange;
+};
+
+}  // namespace sim
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/simulation/XboxControllerSim.h b/wpilibc/src/main/native/include/frc/simulation/XboxControllerSim.h
index d981111..e609ff0 100644
--- a/wpilibc/src/main/native/include/frc/simulation/XboxControllerSim.h
+++ b/wpilibc/src/main/native/include/frc/simulation/XboxControllerSim.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2020 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -34,27 +31,117 @@
    */
   explicit XboxControllerSim(int port);
 
-  void SetX(GenericHID::JoystickHand hand, double value);
+  /**
+   * Change the X axis value of the controller's left stick.
+   *
+   * @param value the new value
+   */
+  void SetLeftX(double value);
 
-  void SetY(GenericHID::JoystickHand hand, double value);
+  /**
+   * Change the X axis value of the controller's right stick.
+   *
+   * @param value the new value
+   */
+  void SetRightX(double value);
 
-  void SetTriggerAxis(GenericHID::JoystickHand hand, double value);
+  /**
+   * Change the Y axis value of the controller's left stick.
+   *
+   * @param value the new value
+   */
+  void SetLeftY(double value);
 
-  void SetBumper(GenericHID::JoystickHand hand, bool state);
+  /**
+   * Change the Y axis value of the controller's right stick.
+   *
+   * @param value the new value
+   */
+  void SetRightY(double value);
 
-  void SetStickButton(GenericHID::JoystickHand hand, bool state);
+  /**
+   * Change the left trigger axis value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetLeftTriggerAxis(double value);
 
-  void SetAButton(bool state);
+  /**
+   * Change the right trigger axis value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetRightTriggerAxis(double value);
 
-  void SetBButton(bool state);
+  /**
+   * Change the left bumper value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetLeftBumper(bool value);
 
-  void SetXButton(bool state);
+  /**
+   * Change the right bumper value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetRightBumper(bool value);
 
-  void SetYButton(bool state);
+  /**
+   * Change the left button value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetLeftStickButton(bool value);
 
-  void SetBackButton(bool state);
+  /**
+   * Change the right button value of the joystick.
+   *
+   * @param value the new value
+   */
+  void SetRightStickButton(bool value);
 
-  void SetStartButton(bool state);
+  /**
+   * Change the value of the A button.
+   *
+   * @param value the new value
+   */
+  void SetAButton(bool value);
+
+  /**
+   * Change the value of the B button.
+   *
+   * @param value the new value
+   */
+  void SetBButton(bool value);
+
+  /**
+   * Change the value of the X button.
+   *
+   * @param value the new value
+   */
+  void SetXButton(bool value);
+
+  /**
+   * Change the value of the Y button.
+   *
+   * @param value the new value
+   */
+  void SetYButton(bool value);
+
+  /**
+   * Change the value of the Back button.
+   *
+   * @param value the new value
+   */
+  void SetBackButton(bool value);
+
+  /**
+   * Change the value of the Start button.
+   *
+   * @param value the new value
+   */
+  void SetStartButton(bool value);
 };
 
 }  // namespace sim
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/Field2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/Field2d.h
new file mode 100644
index 0000000..61d7a72
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/Field2d.h
@@ -0,0 +1,97 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <string_view>
+#include <vector>
+
+#include <networktables/NTSendable.h>
+#include <networktables/NetworkTable.h>
+#include <networktables/NetworkTableEntry.h>
+#include <units/length.h>
+#include <wpi/mutex.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/geometry/Pose2d.h"
+#include "frc/geometry/Rotation2d.h"
+#include "frc/smartdashboard/FieldObject2d.h"
+
+namespace frc {
+
+/**
+ * 2D representation of game field for dashboards.
+ *
+ * An object's pose is the location shown on the dashboard view.  Note that
+ * for the robot, this may or may not match the internal odometry.  For example,
+ * if the robot is shown at a particular starting location, the pose in this
+ * class would represent the actual location on the field, but the robot's
+ * internal state might have a 0,0,0 pose (unless it's initialized to
+ * something different).
+ *
+ * As the user is able to edit the pose, code performing updates should get
+ * the robot pose, transform it as appropriate (e.g. based on wheel odometry),
+ * and set the new pose.
+ *
+ * This class provides methods to set the robot pose, but other objects can
+ * also be shown by using the GetObject() function.  Other objects can
+ * also have multiple poses (which will show the object at multiple locations).
+ */
+class Field2d : public nt::NTSendable, public wpi::SendableHelper<Field2d> {
+ public:
+  using Entry = size_t;
+
+  Field2d();
+
+  Field2d(Field2d&& rhs);
+  Field2d& operator=(Field2d&& rhs);
+
+  /**
+   * Set the robot pose from a Pose object.
+   *
+   * @param pose 2D pose
+   */
+  void SetRobotPose(const Pose2d& pose);
+
+  /**
+   * Set the robot pose from x, y, and rotation.
+   *
+   * @param x X location
+   * @param y Y location
+   * @param rotation rotation
+   */
+  void SetRobotPose(units::meter_t x, units::meter_t y, Rotation2d rotation);
+
+  /**
+   * Get the robot pose.
+   *
+   * @return 2D pose
+   */
+  Pose2d GetRobotPose() const;
+
+  /**
+   * Get or create a field object.
+   *
+   * @return Field object
+   */
+  FieldObject2d* GetObject(std::string_view name);
+
+  /**
+   * Get the robot object.
+   *
+   * @return Field object for robot
+   */
+  FieldObject2d* GetRobotObject();
+
+  void InitSendable(nt::NTSendableBuilder& builder) override;
+
+ private:
+  std::shared_ptr<nt::NetworkTable> m_table;
+
+  mutable wpi::mutex m_mutex;
+  std::vector<std::unique_ptr<FieldObject2d>> m_objects;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/FieldObject2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/FieldObject2d.h
new file mode 100644
index 0000000..2e41d84
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/FieldObject2d.h
@@ -0,0 +1,112 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <initializer_list>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include <networktables/NetworkTableEntry.h>
+#include <units/length.h>
+#include <wpi/SmallVector.h>
+#include <wpi/mutex.h>
+#include <wpi/span.h>
+
+#include "frc/geometry/Pose2d.h"
+#include "frc/geometry/Rotation2d.h"
+
+namespace frc {
+
+class Field2d;
+class Trajectory;
+
+/**
+ * Game field object on a Field2d.
+ */
+class FieldObject2d {
+  friend class Field2d;
+  struct private_init {};
+
+ public:
+  FieldObject2d(std::string_view name, const private_init&) : m_name{name} {}
+
+  FieldObject2d(FieldObject2d&& rhs);
+  FieldObject2d& operator=(FieldObject2d&& rhs);
+
+  /**
+   * Set the pose from a Pose object.
+   *
+   * @param pose 2D pose
+   */
+  void SetPose(const Pose2d& pose);
+
+  /**
+   * Set the pose from x, y, and rotation.
+   *
+   * @param x X location
+   * @param y Y location
+   * @param rotation rotation
+   */
+  void SetPose(units::meter_t x, units::meter_t y, Rotation2d rotation);
+
+  /**
+   * Get the pose.
+   *
+   * @return 2D pose, or 0,0,0 if unknown / does not exist
+   */
+  Pose2d GetPose() const;
+
+  /**
+   * Set multiple poses from an array of Pose objects.
+   * The total number of poses is limited to 85.
+   *
+   * @param poses array of 2D poses
+   */
+  void SetPoses(wpi::span<const Pose2d> poses);
+
+  /**
+   * Set multiple poses from an array of Pose objects.
+   * The total number of poses is limited to 85.
+   *
+   * @param poses array of 2D poses
+   */
+  void SetPoses(std::initializer_list<Pose2d> poses);
+
+  /**
+   * Sets poses from a trajectory.
+   *
+   * @param trajectory The trajectory from which poses should be added.
+   */
+  void SetTrajectory(const Trajectory& trajectory);
+
+  /**
+   * Get multiple poses.
+   *
+   * @param obj Object entry
+   * @return vector of 2D poses
+   */
+  std::vector<Pose2d> GetPoses() const;
+
+  /**
+   * Get multiple poses.
+   *
+   * @param out output SmallVector to hold 2D poses
+   * @return span referring to output SmallVector
+   */
+  wpi::span<const Pose2d> GetPoses(wpi::SmallVectorImpl<Pose2d>& out) const;
+
+ private:
+  void UpdateEntry(bool setDefault = false);
+  void UpdateFromEntry() const;
+
+  mutable wpi::mutex m_mutex;
+  std::string m_name;
+  nt::NetworkTableEntry m_entry;
+  mutable wpi::SmallVector<Pose2d, 1> m_poses;
+};
+
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/ListenerExecutor.h b/wpilibc/src/main/native/include/frc/smartdashboard/ListenerExecutor.h
index 9500278..cdfdafd 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/ListenerExecutor.h
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/ListenerExecutor.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/Mechanism2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/Mechanism2d.h
new file mode 100644
index 0000000..cbe25be
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/Mechanism2d.h
@@ -0,0 +1,87 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include <networktables/NTSendable.h>
+#include <networktables/NetworkTableEntry.h>
+#include <wpi/StringMap.h>
+#include <wpi/mutex.h>
+#include <wpi/sendable/SendableHelper.h>
+
+#include "frc/smartdashboard/MechanismRoot2d.h"
+#include "frc/util/Color8Bit.h"
+
+namespace frc {
+
+/**
+ * Visual 2D representation of arms, elevators, and general mechanisms through
+ * a node-based API.
+ *
+ * A Mechanism2d object is published and contains at least one root node. A root
+ * is the anchor point of other nodes (such as ligaments). Other nodes are
+ * recursively appended based on other nodes.
+ *
+ * Except for the Mechanism2d container object, none of the objects should be
+ * passed or interacted with by value! Obtain pointers from factory methods such
+ * as Mechanism2d.GetRoot() and MechanismObject2d.Append<>(). The Mechanism2d
+ * container object owns the root nodes, and each node internally owns the nodes
+ * based on it. Beware not to let the Mechanism2d object out of scope - all
+ * nodes will be recursively destructed!
+ *
+ * @see MechanismObject2d
+ * @see MechanismLigament2d
+ * @see MechanismRoot2d
+ */
+class Mechanism2d : public nt::NTSendable,
+                    public wpi::SendableHelper<Mechanism2d> {
+ public:
+  /**
+   * Create a new Mechanism2d with the given dimensions and background color.
+   *
+   * The dimensions represent the canvas that all the nodes are drawn on. The
+   * default color is dark blue.
+   *
+   * @param width the width
+   * @param height the height
+   * @param backgroundColor the background color
+   */
+  Mechanism2d(double width, double height,
+              const Color8Bit& backgroundColor = {0, 0, 32});
+
+  /**
+   * Get or create a root in this Mechanism2d with the given name and
+   * position.
+   *
+   * <p>If a root with the given name already exists, the given x and y
+   * coordinates are not used.
+   *
+   * @param name the root name
+   * @param x the root x coordinate
+   * @param y the root y coordinate
+   * @return a new root object, or the existing one with the given name.
+   */
+  MechanismRoot2d* GetRoot(std::string_view name, double x, double y);
+
+  /**
+   * Set the Mechanism2d background color.
+   *
+   * @param color the new background color
+   */
+  void SetBackgroundColor(const Color8Bit& color);
+
+  void InitSendable(nt::NTSendableBuilder& builder) override;
+
+ private:
+  double m_width;
+  double m_height;
+  char m_color[10];
+  mutable wpi::mutex m_mutex;
+  std::shared_ptr<nt::NetworkTable> m_table;
+  wpi::StringMap<std::unique_ptr<MechanismRoot2d>> m_roots;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/MechanismLigament2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismLigament2d.h
new file mode 100644
index 0000000..70abaa6
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismLigament2d.h
@@ -0,0 +1,88 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <string_view>
+
+#include <networktables/NetworkTableEntry.h>
+#include <units/angle.h>
+
+#include "frc/smartdashboard/MechanismObject2d.h"
+#include "frc/util/Color8Bit.h"
+
+namespace frc {
+
+/**
+ * Ligament node on a Mechanism2d.
+ *
+ * A ligament can have its length changed (like an elevator) or angle changed,
+ * like an arm.
+ *
+ * @see Mechanism2d
+ */
+class MechanismLigament2d : public MechanismObject2d {
+ public:
+  MechanismLigament2d(std::string_view name, double length,
+                      units::degree_t angle, double lineWidth = 6,
+                      const frc::Color8Bit& color = {235, 137, 52});
+
+  /**
+   * Set the ligament color.
+   *
+   * @param color the color of the line
+   */
+  void SetColor(const frc::Color8Bit& color);
+
+  /**
+   * Set the ligament's length.
+   *
+   * @param length the line length
+   */
+  void SetLength(double length);
+
+  /**
+   * Get the ligament length.
+   *
+   * @return the line length
+   */
+  double GetLength();
+
+  /**
+   * Set the ligament's angle relative to its parent.
+   *
+   * @param angle the angle
+   */
+  void SetAngle(units::degree_t angle);
+
+  /**
+   * Get the ligament's angle relative to its parent.
+   *
+   * @return the angle
+   */
+  double GetAngle();
+
+  /**
+   * Set the line thickness.
+   *
+   * @param lineWidth the line thickness
+   */
+  void SetLineWeight(double lineWidth);
+
+ protected:
+  void UpdateEntries(std::shared_ptr<nt::NetworkTable> table) override;
+
+ private:
+  void Flush();
+  double m_length;
+  nt::NetworkTableEntry m_lengthEntry;
+  double m_angle;
+  nt::NetworkTableEntry m_angleEntry;
+  double m_weight;
+  nt::NetworkTableEntry m_weightEntry;
+  char m_color[10];
+  nt::NetworkTableEntry m_colorEntry;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/MechanismObject2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismObject2d.h
new file mode 100644
index 0000000..c4185e7
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismObject2d.h
@@ -0,0 +1,91 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <string_view>
+#include <type_traits>
+#include <utility>
+
+#include <networktables/NetworkTable.h>
+#include <wpi/StringMap.h>
+
+#include "frc/Errors.h"
+
+namespace frc {
+
+/**
+ * Common base class for all Mechanism2d node types.
+ *
+ * To append another node, call Append with the type of node and its
+ * construction parameters. None of the node types are designed to be
+ * constructed directly, and are owned by their parent node/container - obtain
+ * pointers from the Append function or similar factory methods.
+ *
+ * @see Mechanism2d.
+ */
+class MechanismObject2d {
+  friend class Mechanism2d;
+
+ protected:
+  explicit MechanismObject2d(std::string_view name);
+
+  /**
+   * Update all entries with new ones from a new table.
+   *
+   * @param table the new table.
+   */
+  virtual void UpdateEntries(std::shared_ptr<nt::NetworkTable> table) = 0;
+
+  mutable wpi::mutex m_mutex;
+
+ public:
+  virtual ~MechanismObject2d() = default;
+
+  /**
+   * Retrieve the object's name.
+   *
+   * @return the object's name relative to its parent.
+   */
+  const std::string& GetName() const;
+
+  /**
+   * Append a Mechanism object that is based on this one.
+   *
+   * @param name the name of the new object.
+   * @param args constructor arguments of the object type.
+   * @return the constructed and appended object, useful for variable
+   * assignments and call chaining.
+   * @throw if an object with the given name already exists.
+   */
+  template <typename T, typename... Args,
+            typename =
+                std::enable_if_t<std::is_convertible_v<T*, MechanismObject2d*>>>
+  T* Append(std::string_view name, Args&&... args) {
+    std::scoped_lock lock(m_mutex);
+    auto& obj = m_objects[name];
+    if (obj) {
+      throw FRC_MakeError(
+          err::Error,
+          "MechanismObject names must be unique! `{}` was inserted twice!",
+          name);
+    }
+    obj = std::make_unique<T>(name, std::forward<Args>(args)...);
+    T* ex = static_cast<T*>(obj.get());
+    if (m_table) {
+      ex->Update(m_table->GetSubTable(name));
+    }
+    return ex;
+  }
+
+ private:
+  std::string m_name;
+  wpi::StringMap<std::unique_ptr<MechanismObject2d>> m_objects;
+  std::shared_ptr<nt::NetworkTable> m_table;
+  void Update(std::shared_ptr<nt::NetworkTable> table);
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/MechanismRoot2d.h b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismRoot2d.h
new file mode 100644
index 0000000..5072547
--- /dev/null
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/MechanismRoot2d.h
@@ -0,0 +1,54 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <string_view>
+
+#include <networktables/NetworkTableEntry.h>
+
+#include "MechanismObject2d.h"
+
+namespace frc {
+
+/**
+ * Root Mechanism2d node.
+ *
+ * A root is the anchor point of other nodes (such as ligaments).
+ *
+ * Do not create objects of this class directly! Obtain pointers from the
+ * Mechanism2d.GetRoot() factory method.
+ *
+ * <p>Append other nodes by using Append().
+ */
+class MechanismRoot2d : private MechanismObject2d {
+  friend class Mechanism2d;
+  struct private_init {};
+
+ public:
+  MechanismRoot2d(std::string_view name, double x, double y,
+                  const private_init&);
+
+  /**
+   * Set the root's position.
+   *
+   * @param x new x coordinate
+   * @param y new y coordinate
+   */
+  void SetPosition(double x, double y);
+
+  using MechanismObject2d::GetName;
+
+  using MechanismObject2d::Append;
+
+ private:
+  void UpdateEntries(std::shared_ptr<nt::NetworkTable> table) override;
+  inline void Flush();
+  double m_x;
+  double m_y;
+  nt::NetworkTableEntry m_xEntry;
+  nt::NetworkTableEntry m_yEntry;
+};
+}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/Sendable.h b/wpilibc/src/main/native/include/frc/smartdashboard/Sendable.h
deleted file mode 100644
index 5000855..0000000
--- a/wpilibc/src/main/native/include/frc/smartdashboard/Sendable.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-namespace frc {
-
-class SendableBuilder;
-
-/**
- * Interface for Sendable objects.
- */
-class Sendable {
- public:
-  virtual ~Sendable() = default;
-
-  /**
-   * Initializes this Sendable object.
-   *
-   * @param builder sendable builder
-   */
-  virtual void InitSendable(SendableBuilder& builder) = 0;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBase.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableBase.h
deleted file mode 100644
index 98419b9..0000000
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBase.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <wpi/deprecated.h>
-
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
-
-namespace frc {
-
-class SendableBase : public Sendable, public SendableHelper<SendableBase> {
- public:
-  /**
-   * Creates an instance of the sensor base
-   *
-   * @deprecated use Sendable and SendableHelper
-   *
-   * @param addLiveWindow if true, add this Sendable to LiveWindow
-   */
-  WPI_DEPRECATED("use Sendable and SendableHelper")
-  explicit SendableBase(bool addLiveWindow = true);
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilder.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilder.h
deleted file mode 100644
index 3f5f892..0000000
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilder.h
+++ /dev/null
@@ -1,222 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2018 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <functional>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include <networktables/NetworkTableEntry.h>
-#include <networktables/NetworkTableValue.h>
-#include <wpi/ArrayRef.h>
-#include <wpi/SmallVector.h>
-#include <wpi/Twine.h>
-
-namespace frc {
-
-class SendableBuilder {
- public:
-  virtual ~SendableBuilder() = default;
-
-  /**
-   * Set the string representation of the named data type that will be used
-   * by the smart dashboard for this sendable.
-   *
-   * @param type    data type
-   */
-  virtual void SetSmartDashboardType(const wpi::Twine& type) = 0;
-
-  /**
-   * Set a flag indicating if this sendable should be treated as an actuator.
-   * By default this flag is false.
-   *
-   * @param value   true if actuator, false if not
-   */
-  virtual void SetActuator(bool value) = 0;
-
-  /**
-   * Set the function that should be called to set the Sendable into a safe
-   * state.  This is called when entering and exiting Live Window mode.
-   *
-   * @param func    function
-   */
-  virtual void SetSafeState(std::function<void()> func) = 0;
-
-  /**
-   * Set the function that should be called to update the network table
-   * for things other than properties.  Note this function is not passed
-   * the network table object; instead it should use the entry handles
-   * returned by GetEntry().
-   *
-   * @param func    function
-   */
-  virtual void SetUpdateTable(std::function<void()> func) = 0;
-
-  /**
-   * Add a property without getters or setters.  This can be used to get
-   * entry handles for the function called by SetUpdateTable().
-   *
-   * @param key   property name
-   * @return Network table entry
-   */
-  virtual nt::NetworkTableEntry GetEntry(const wpi::Twine& key) = 0;
-
-  /**
-   * Add a boolean property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddBooleanProperty(const wpi::Twine& key,
-                                  std::function<bool()> getter,
-                                  std::function<void(bool)> setter) = 0;
-
-  /**
-   * Add a double property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddDoubleProperty(const wpi::Twine& key,
-                                 std::function<double()> getter,
-                                 std::function<void(double)> setter) = 0;
-
-  /**
-   * Add a string property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddStringProperty(
-      const wpi::Twine& key, std::function<std::string()> getter,
-      std::function<void(wpi::StringRef)> setter) = 0;
-
-  /**
-   * Add a boolean array property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddBooleanArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<int>()> getter,
-      std::function<void(wpi::ArrayRef<int>)> setter) = 0;
-
-  /**
-   * Add a double array property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddDoubleArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<double>()> getter,
-      std::function<void(wpi::ArrayRef<double>)> setter) = 0;
-
-  /**
-   * Add a string array property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddStringArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<std::string>()> getter,
-      std::function<void(wpi::ArrayRef<std::string>)> setter) = 0;
-
-  /**
-   * Add a raw property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddRawProperty(const wpi::Twine& key,
-                              std::function<std::string()> getter,
-                              std::function<void(wpi::StringRef)> setter) = 0;
-
-  /**
-   * Add a NetworkTableValue property.
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddValueProperty(
-      const wpi::Twine& key, std::function<std::shared_ptr<nt::Value>()> getter,
-      std::function<void(std::shared_ptr<nt::Value>)> setter) = 0;
-
-  /**
-   * Add a string property (SmallString form).
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddSmallStringProperty(
-      const wpi::Twine& key,
-      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(wpi::StringRef)> setter) = 0;
-
-  /**
-   * Add a boolean array property (SmallVector form).
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddSmallBooleanArrayProperty(
-      const wpi::Twine& key,
-      std::function<wpi::ArrayRef<int>(wpi::SmallVectorImpl<int>& buf)> getter,
-      std::function<void(wpi::ArrayRef<int>)> setter) = 0;
-
-  /**
-   * Add a double array property (SmallVector form).
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddSmallDoubleArrayProperty(
-      const wpi::Twine& key,
-      std::function<wpi::ArrayRef<double>(wpi::SmallVectorImpl<double>& buf)>
-          getter,
-      std::function<void(wpi::ArrayRef<double>)> setter) = 0;
-
-  /**
-   * Add a string array property (SmallVector form).
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddSmallStringArrayProperty(
-      const wpi::Twine& key,
-      std::function<
-          wpi::ArrayRef<std::string>(wpi::SmallVectorImpl<std::string>& buf)>
-          getter,
-      std::function<void(wpi::ArrayRef<std::string>)> setter) = 0;
-
-  /**
-   * Add a raw property (SmallVector form).
-   *
-   * @param key     property name
-   * @param getter  getter function (returns current value)
-   * @param setter  setter function (sets new value)
-   */
-  virtual void AddSmallRawProperty(
-      const wpi::Twine& key,
-      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(wpi::StringRef)> setter) = 0;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilderImpl.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilderImpl.h
index e5dea44..36830f6 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilderImpl.h
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/SendableBuilderImpl.h
@@ -1,30 +1,26 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <functional>
 #include <memory>
 #include <string>
+#include <string_view>
 #include <utility>
 #include <vector>
 
+#include <networktables/NTSendableBuilder.h>
 #include <networktables/NetworkTable.h>
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableValue.h>
-#include <wpi/ArrayRef.h>
 #include <wpi/SmallVector.h>
-#include <wpi/Twine.h>
-
-#include "frc/smartdashboard/SendableBuilder.h"
+#include <wpi/span.h>
 
 namespace frc {
 
-class SendableBuilderImpl : public SendableBuilder {
+class SendableBuilderImpl : public nt::NTSendableBuilder {
  public:
   SendableBuilderImpl() = default;
   ~SendableBuilderImpl() override = default;
@@ -43,13 +39,13 @@
    * Get the network table.
    * @return The network table
    */
-  std::shared_ptr<nt::NetworkTable> GetTable();
+  std::shared_ptr<nt::NetworkTable> GetTable() override;
 
   /**
    * Return whether this sendable has an associated table.
    * @return True if it has a table, false if not.
    */
-  bool HasTable() const;
+  bool IsPublished() const override;
 
   /**
    * Return whether this sendable should be treated as an actuator.
@@ -60,7 +56,7 @@
   /**
    * Update the network table values by calling the getters for all properties.
    */
-  void UpdateTable();
+  void Update() override;
 
   /**
    * Hook setters for all properties.
@@ -87,75 +83,75 @@
   /**
    * Clear properties.
    */
-  void ClearProperties();
+  void ClearProperties() override;
 
-  void SetSmartDashboardType(const wpi::Twine& type) override;
+  void SetSmartDashboardType(std::string_view type) override;
   void SetActuator(bool value) override;
   void SetSafeState(std::function<void()> func) override;
   void SetUpdateTable(std::function<void()> func) override;
-  nt::NetworkTableEntry GetEntry(const wpi::Twine& key) override;
+  nt::NetworkTableEntry GetEntry(std::string_view key) override;
 
-  void AddBooleanProperty(const wpi::Twine& key, std::function<bool()> getter,
+  void AddBooleanProperty(std::string_view key, std::function<bool()> getter,
                           std::function<void(bool)> setter) override;
 
-  void AddDoubleProperty(const wpi::Twine& key, std::function<double()> getter,
+  void AddDoubleProperty(std::string_view key, std::function<double()> getter,
                          std::function<void(double)> setter) override;
 
-  void AddStringProperty(const wpi::Twine& key,
+  void AddStringProperty(std::string_view key,
                          std::function<std::string()> getter,
-                         std::function<void(wpi::StringRef)> setter) override;
+                         std::function<void(std::string_view)> setter) override;
 
   void AddBooleanArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<int>()> getter,
-      std::function<void(wpi::ArrayRef<int>)> setter) override;
+      std::string_view key, std::function<std::vector<int>()> getter,
+      std::function<void(wpi::span<const int>)> setter) override;
 
   void AddDoubleArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<double>()> getter,
-      std::function<void(wpi::ArrayRef<double>)> setter) override;
+      std::string_view key, std::function<std::vector<double>()> getter,
+      std::function<void(wpi::span<const double>)> setter) override;
 
   void AddStringArrayProperty(
-      const wpi::Twine& key, std::function<std::vector<std::string>()> getter,
-      std::function<void(wpi::ArrayRef<std::string>)> setter) override;
+      std::string_view key, std::function<std::vector<std::string>()> getter,
+      std::function<void(wpi::span<const std::string>)> setter) override;
 
-  void AddRawProperty(const wpi::Twine& key,
-                      std::function<std::string()> getter,
-                      std::function<void(wpi::StringRef)> setter) override;
+  void AddRawProperty(std::string_view key, std::function<std::string()> getter,
+                      std::function<void(std::string_view)> setter) override;
 
   void AddValueProperty(
-      const wpi::Twine& key, std::function<std::shared_ptr<nt::Value>()> getter,
+      std::string_view key, std::function<std::shared_ptr<nt::Value>()> getter,
       std::function<void(std::shared_ptr<nt::Value>)> setter) override;
 
   void AddSmallStringProperty(
-      const wpi::Twine& key,
-      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(wpi::StringRef)> setter) override;
+      std::string_view key,
+      std::function<std::string_view(wpi::SmallVectorImpl<char>& buf)> getter,
+      std::function<void(std::string_view)> setter) override;
 
   void AddSmallBooleanArrayProperty(
-      const wpi::Twine& key,
-      std::function<wpi::ArrayRef<int>(wpi::SmallVectorImpl<int>& buf)> getter,
-      std::function<void(wpi::ArrayRef<int>)> setter) override;
+      std::string_view key,
+      std::function<wpi::span<const int>(wpi::SmallVectorImpl<int>& buf)>
+          getter,
+      std::function<void(wpi::span<const int>)> setter) override;
 
   void AddSmallDoubleArrayProperty(
-      const wpi::Twine& key,
-      std::function<wpi::ArrayRef<double>(wpi::SmallVectorImpl<double>& buf)>
+      std::string_view key,
+      std::function<wpi::span<const double>(wpi::SmallVectorImpl<double>& buf)>
           getter,
-      std::function<void(wpi::ArrayRef<double>)> setter) override;
+      std::function<void(wpi::span<const double>)> setter) override;
 
   void AddSmallStringArrayProperty(
-      const wpi::Twine& key,
+      std::string_view key,
       std::function<
-          wpi::ArrayRef<std::string>(wpi::SmallVectorImpl<std::string>& buf)>
+          wpi::span<const std::string>(wpi::SmallVectorImpl<std::string>& buf)>
           getter,
-      std::function<void(wpi::ArrayRef<std::string>)> setter) override;
+      std::function<void(wpi::span<const std::string>)> setter) override;
 
   void AddSmallRawProperty(
-      const wpi::Twine& key,
-      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(wpi::StringRef)> setter) override;
+      std::string_view key,
+      std::function<std::string_view(wpi::SmallVectorImpl<char>& buf)> getter,
+      std::function<void(std::string_view)> setter) override;
 
  private:
   struct Property {
-    Property(nt::NetworkTable& table, const wpi::Twine& key)
+    Property(nt::NetworkTable& table, std::string_view key)
         : entry(table.GetEntry(key)) {}
 
     Property(const Property&) = delete;
@@ -183,8 +179,9 @@
     ~Property() { StopListener(); }
 
     void StartListener() {
-      if (entry && listener == 0 && createListener)
+      if (entry && listener == 0 && createListener) {
         listener = createListener(entry);
+      }
     }
 
     void StopListener() {
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.h
index b370fc0..b693762 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.h
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.h
@@ -1,19 +1,15 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
+#include <string_view>
 
 #include <wpi/StringMap.h>
-#include <wpi/StringRef.h>
 #include <wpi/deprecated.h>
 
-#include "frc/smartdashboard/SendableBuilder.h"
 #include "frc/smartdashboard/SendableChooserBase.h"
 
 namespace frc {
@@ -45,27 +41,21 @@
   static std::weak_ptr<U> _unwrap_smart_ptr(const std::shared_ptr<U>& value);
 
  public:
-  ~SendableChooser() override = default;
   SendableChooser() = default;
+  ~SendableChooser() override = default;
   SendableChooser(SendableChooser&& rhs) = default;
   SendableChooser& operator=(SendableChooser&& rhs) = default;
 
-  void AddOption(wpi::StringRef name, T object);
-  void SetDefaultOption(wpi::StringRef name, T object);
-
   /**
    * Adds the given object to the list of options.
    *
    * On the SmartDashboard on the desktop, the object will appear as the given
    * name.
    *
-   * @deprecated use AddOption(wpi::StringRef name, T object) instead.
-   *
    * @param name   the name of the option
    * @param object the option
    */
-  WPI_DEPRECATED("use AddOption() instead")
-  void AddObject(wpi::StringRef name, T object) { AddOption(name, object); }
+  void AddOption(std::string_view name, T object);
 
   /**
    * Add the given object to the list of options and marks it as the default.
@@ -73,19 +63,55 @@
    * Functionally, this is very close to AddOption() except that it will use
    * this as the default option if none other is explicitly selected.
    *
-   * @deprecated use SetDefaultOption(wpi::StringRef name, T object) instead.
+   * @param name   the name of the option
+   * @param object the option
+   */
+  void SetDefaultOption(std::string_view name, T object);
+
+  /**
+   * Adds the given object to the list of options.
+   *
+   * On the SmartDashboard on the desktop, the object will appear as the given
+   * name.
+   *
+   * @deprecated use AddOption(std::string_view name, T object) instead.
+   *
+   * @param name   the name of the option
+   * @param object the option
+   */
+  WPI_DEPRECATED("use AddOption() instead")
+  void AddObject(std::string_view name, T object) { AddOption(name, object); }
+
+  /**
+   * Add the given object to the list of options and marks it as the default.
+   *
+   * Functionally, this is very close to AddOption() except that it will use
+   * this as the default option if none other is explicitly selected.
+   *
+   * @deprecated use SetDefaultOption(std::string_view name, T object) instead.
    *
    * @param name   the name of the option
    * @param object the option
    */
   WPI_DEPRECATED("use SetDefaultOption() instead")
-  void AddDefault(wpi::StringRef name, T object) {
+  void AddDefault(std::string_view name, T object) {
     SetDefaultOption(name, object);
   }
 
+  /**
+   * Returns a copy of the selected option (a raw pointer U* if T =
+   * std::unique_ptr<U> or a std::weak_ptr<U> if T = std::shared_ptr<U>).
+   *
+   * If there is none selected, it will return the default. If there is none
+   * selected and no default, then it will return a value-initialized instance.
+   * For integer types, this is 0. For container types like std::string, this is
+   * an empty string.
+   *
+   * @return The option selected
+   */
   auto GetSelected() -> decltype(_unwrap_smart_ptr(m_choices[""]));
 
-  void InitSendable(SendableBuilder& builder) override;
+  void InitSendable(nt::NTSendableBuilder& builder) override;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.inc b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.inc
index 57e2828..25e2551 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.inc
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooser.inc
@@ -1,69 +1,42 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <algorithm>
 #include <memory>
 #include <string>
+#include <string_view>
 #include <utility>
 #include <vector>
 
-#include <wpi/StringRef.h>
+#include <networktables/NTSendableBuilder.h>
+
+#include "frc/smartdashboard/SendableChooser.h"
 
 namespace frc {
 
-/**
- * Adds the given object to the list of options.
- *
- * On the SmartDashboard on the desktop, the object will appear as the given
- * name.
- *
- * @param name   the name of the option
- * @param object the option
- */
 template <class T>
-void SendableChooser<T>::AddOption(wpi::StringRef name, T object) {
+void SendableChooser<T>::AddOption(std::string_view name, T object) {
   m_choices[name] = std::move(object);
 }
 
-/**
- * Add the given object to the list of options and marks it as the default.
- *
- * Functionally, this is very close to AddOption() except that it will use this
- * as the default option if none other is explicitly selected.
- *
- * @param name   the name of the option
- * @param object the option
- */
 template <class T>
-void SendableChooser<T>::SetDefaultOption(wpi::StringRef name, T object) {
+void SendableChooser<T>::SetDefaultOption(std::string_view name, T object) {
   m_defaultChoice = name;
   AddOption(name, std::move(object));
 }
 
-/**
- * Returns a copy of the selected option (a raw pointer U* if T =
- * std::unique_ptr<U> or a std::weak_ptr<U> if T = std::shared_ptr<U>).
- *
- * If there is none selected, it will return the default. If there is none
- * selected and no default, then it will return a value-initialized instance.
- * For integer types, this is 0. For container types like std::string, this is
- * an empty string.
- *
- * @return The option selected
- */
 template <class T>
 auto SendableChooser<T>::GetSelected()
     -> decltype(_unwrap_smart_ptr(m_choices[""])) {
   std::string selected = m_defaultChoice;
   {
     std::scoped_lock lock(m_mutex);
-    if (m_haveSelected) selected = m_selected;
+    if (m_haveSelected) {
+      selected = m_selected;
+    }
   }
   if (selected.empty()) {
     return decltype(_unwrap_smart_ptr(m_choices[""])){};
@@ -73,15 +46,15 @@
 }
 
 template <class T>
-void SendableChooser<T>::InitSendable(SendableBuilder& builder) {
+void SendableChooser<T>::InitSendable(nt::NTSendableBuilder& builder) {
   builder.SetSmartDashboardType("String Chooser");
   builder.GetEntry(kInstance).SetDouble(m_instance);
   builder.AddStringArrayProperty(
       kOptions,
-      [=]() {
+      [=] {
         std::vector<std::string> keys;
         for (const auto& choice : m_choices) {
-          keys.push_back(choice.first());
+          keys.emplace_back(choice.first());
         }
 
         // Unlike std::map, wpi::StringMap elements
@@ -93,17 +66,17 @@
       nullptr);
   builder.AddSmallStringProperty(
       kDefault,
-      [=](wpi::SmallVectorImpl<char>&) -> wpi::StringRef {
+      [=](wpi::SmallVectorImpl<char>&) -> std::string_view {
         return m_defaultChoice;
       },
       nullptr);
   builder.AddSmallStringProperty(
       kActive,
-      [=](wpi::SmallVectorImpl<char>& buf) -> wpi::StringRef {
+      [=](wpi::SmallVectorImpl<char>& buf) -> std::string_view {
         std::scoped_lock lock(m_mutex);
         if (m_haveSelected) {
           buf.assign(m_selected.begin(), m_selected.end());
-          return wpi::StringRef(buf.data(), buf.size());
+          return {buf.data(), buf.size()};
         } else {
           return m_defaultChoice;
         }
@@ -113,11 +86,13 @@
     std::scoped_lock lock(m_mutex);
     m_activeEntries.emplace_back(builder.GetEntry(kActive));
   }
-  builder.AddStringProperty(kSelected, nullptr, [=](wpi::StringRef val) {
+  builder.AddStringProperty(kSelected, nullptr, [=](std::string_view val) {
     std::scoped_lock lock(m_mutex);
     m_haveSelected = true;
     m_selected = val;
-    for (auto& entry : m_activeEntries) entry.SetString(val);
+    for (auto& entry : m_activeEntries) {
+      entry.SetString(val);
+    }
   });
 }
 
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooserBase.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooserBase.h
index 2a5f5ab..78f891a 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooserBase.h
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/SendableChooserBase.h
@@ -1,21 +1,17 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <atomic>
 #include <string>
 
+#include <networktables/NTSendable.h>
 #include <networktables/NetworkTableEntry.h>
 #include <wpi/SmallVector.h>
 #include <wpi/mutex.h>
-
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+#include <wpi/sendable/SendableHelper.h>
 
 namespace frc {
 
@@ -25,8 +21,8 @@
  * It contains static, non-templated variables to avoid their duplication in the
  * template class.
  */
-class SendableChooserBase : public Sendable,
-                            public SendableHelper<SendableChooserBase> {
+class SendableChooserBase : public nt::NTSendable,
+                            public wpi::SendableHelper<SendableChooserBase> {
  public:
   SendableChooserBase();
   ~SendableChooserBase() override = default;
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableHelper.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableHelper.h
deleted file mode 100644
index 1f39216..0000000
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableHelper.h
+++ /dev/null
@@ -1,179 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <wpi/Twine.h>
-#include <wpi/deprecated.h>
-
-#include "frc/smartdashboard/SendableRegistry.h"
-
-namespace frc {
-
-/**
- * A helper class for use with objects that add themselves to SendableRegistry.
- * It takes care of properly calling Move() and Remove() on move and
- * destruction.  No action is taken if the object is copied.
- * Use public inheritance with CRTP when using this class.
- * @tparam CRTP derived class
- */
-template <typename Derived>
-class SendableHelper {
- public:
-  SendableHelper(const SendableHelper& rhs) = default;
-  SendableHelper& operator=(const SendableHelper& rhs) = default;
-
-  SendableHelper(SendableHelper&& rhs) {
-    // it is safe to call Move() multiple times with the same rhs
-    SendableRegistry::GetInstance().Move(static_cast<Derived*>(this),
-                                         static_cast<Derived*>(&rhs));
-  }
-
-  SendableHelper& operator=(SendableHelper&& rhs) {
-    // it is safe to call Move() multiple times with the same rhs
-    SendableRegistry::GetInstance().Move(static_cast<Derived*>(this),
-                                         static_cast<Derived*>(&rhs));
-    return *this;
-  }
-
-  /**
-   * Gets the name of this Sendable object.
-   *
-   * @deprecated use SendableRegistry::GetName()
-   *
-   * @return Name
-   */
-  WPI_DEPRECATED("use SendableRegistry::GetName()")
-  std::string GetName() const {
-    return SendableRegistry::GetInstance().GetName(
-        static_cast<const Derived*>(this));
-  }
-
-  /**
-   * Sets the name of this Sendable object.
-   *
-   * @deprecated use SendableRegistry::SetName()
-   *
-   * @param name name
-   */
-  WPI_DEPRECATED("use SendableRegistry::SetName()")
-  void SetName(const wpi::Twine& name) {
-    SendableRegistry::GetInstance().SetName(static_cast<Derived*>(this), name);
-  }
-
-  /**
-   * Sets both the subsystem name and device name of this Sendable object.
-   *
-   * @deprecated use SendableRegistry::SetName()
-   *
-   * @param subsystem subsystem name
-   * @param name device name
-   */
-  WPI_DEPRECATED("use SendableRegistry::SetName()")
-  void SetName(const wpi::Twine& subsystem, const wpi::Twine& name) {
-    SendableRegistry::GetInstance().SetName(static_cast<Derived*>(this),
-                                            subsystem, name);
-  }
-
-  /**
-   * Gets the subsystem name of this Sendable object.
-   *
-   * @deprecated use SendableRegistry::GetSubsystem().
-   *
-   * @return Subsystem name
-   */
-  WPI_DEPRECATED("use SendableRegistry::GetSubsystem()")
-  std::string GetSubsystem() const {
-    return SendableRegistry::GetInstance().GetSubsystem(
-        static_cast<const Derived*>(this));
-  }
-
-  /**
-   * Sets the subsystem name of this Sendable object.
-   *
-   * @deprecated use SendableRegistry::SetSubsystem()
-   *
-   * @param subsystem subsystem name
-   */
-  WPI_DEPRECATED("use SendableRegistry::SetSubsystem()")
-  void SetSubsystem(const wpi::Twine& subsystem) {
-    SendableRegistry::GetInstance().SetSubsystem(static_cast<Derived*>(this),
-                                                 subsystem);
-  }
-
- protected:
-  /**
-   * Add a child component.
-   *
-   * @deprecated use SendableRegistry::AddChild()
-   *
-   * @param child child component
-   */
-  WPI_DEPRECATED("use SendableRegistry::AddChild()")
-  void AddChild(std::shared_ptr<Sendable> child) {
-    SendableRegistry::GetInstance().AddChild(static_cast<Derived*>(this),
-                                             child.get());
-  }
-
-  /**
-   * Add a child component.
-   *
-   * @deprecated use SendableRegistry::AddChild()
-   *
-   * @param child child component
-   */
-  WPI_DEPRECATED("use SendableRegistry::AddChild()")
-  void AddChild(void* child) {
-    SendableRegistry::GetInstance().AddChild(static_cast<Derived*>(this),
-                                             child);
-  }
-
-  /**
-   * Sets the name of the sensor with a channel number.
-   *
-   * @deprecated use SendableRegistry::SetName()
-   *
-   * @param moduleType A string that defines the module name in the label for
-   *                   the value
-   * @param channel    The channel number the device is plugged into
-   */
-  WPI_DEPRECATED("use SendableRegistry::SetName()")
-  void SetName(const wpi::Twine& moduleType, int channel) {
-    SendableRegistry::GetInstance().SetName(static_cast<Derived*>(this),
-                                            moduleType, channel);
-  }
-
-  /**
-   * Sets the name of the sensor with a module and channel number.
-   *
-   * @deprecated use SendableRegistry::SetName()
-   *
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param moduleNumber The number of the particular module type
-   * @param channel      The channel number the device is plugged into (usually
-   * PWM)
-   */
-  WPI_DEPRECATED("use SendableRegistry::SetName()")
-  void SetName(const wpi::Twine& moduleType, int moduleNumber, int channel) {
-    SendableRegistry::GetInstance().SetName(static_cast<Derived*>(this),
-                                            moduleType, moduleNumber, channel);
-  }
-
- protected:
-  SendableHelper() = default;
-
-  ~SendableHelper() {
-    // it is safe to call Remove() multiple times with the same object
-    SendableRegistry::GetInstance().Remove(static_cast<Derived*>(this));
-  }
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SendableRegistry.h b/wpilibc/src/main/native/include/frc/smartdashboard/SendableRegistry.h
deleted file mode 100644
index 78dabc6..0000000
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SendableRegistry.h
+++ /dev/null
@@ -1,341 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <memory>
-#include <string>
-
-#include <networktables/NetworkTable.h>
-#include <wpi/STLExtras.h>
-#include <wpi/Twine.h>
-
-namespace frc {
-
-class Sendable;
-class SendableBuilderImpl;
-
-/**
- * The SendableRegistry class is the public interface for registering sensors
- * and actuators for use on dashboards and LiveWindow.
- */
-class SendableRegistry {
- public:
-  SendableRegistry(const SendableRegistry&) = delete;
-  SendableRegistry& operator=(const SendableRegistry&) = delete;
-
-  using UID = size_t;
-
-  /**
-   * Gets an instance of the SendableRegistry class.
-   *
-   * This is a singleton to guarantee that there is only a single instance
-   * regardless of how many times GetInstance is called.
-   */
-  static SendableRegistry& GetInstance();
-
-  /**
-   * Adds an object to the registry.
-   *
-   * @param sendable object to add
-   * @param name component name
-   */
-  void Add(Sendable* sendable, const wpi::Twine& name);
-
-  /**
-   * Adds an object to the registry.
-   *
-   * @param sendable     object to add
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param channel      The channel number the device is plugged into
-   */
-  void Add(Sendable* sendable, const wpi::Twine& moduleType, int channel);
-
-  /**
-   * Adds an object to the registry.
-   *
-   * @param sendable     object to add
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param moduleNumber The number of the particular module type
-   * @param channel      The channel number the device is plugged into
-   */
-  void Add(Sendable* sendable, const wpi::Twine& moduleType, int moduleNumber,
-           int channel);
-
-  /**
-   * Adds an object to the registry.
-   *
-   * @param sendable object to add
-   * @param subsystem subsystem name
-   * @param name component name
-   */
-  void Add(Sendable* sendable, const wpi::Twine& subsystem,
-           const wpi::Twine& name);
-
-  /**
-   * Adds an object to the registry and LiveWindow.
-   *
-   * @param sendable object to add
-   * @param name component name
-   */
-  void AddLW(Sendable* sendable, const wpi::Twine& name);
-
-  /**
-   * Adds an object to the registry and LiveWindow.
-   *
-   * @param sendable     object to add
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param channel      The channel number the device is plugged into
-   */
-  void AddLW(Sendable* sendable, const wpi::Twine& moduleType, int channel);
-
-  /**
-   * Adds an object to the registry and LiveWindow.
-   *
-   * @param sendable     object to add
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param moduleNumber The number of the particular module type
-   * @param channel      The channel number the device is plugged into
-   */
-  void AddLW(Sendable* sendable, const wpi::Twine& moduleType, int moduleNumber,
-             int channel);
-
-  /**
-   * Adds an object to the registry and LiveWindow.
-   *
-   * @param sendable object to add
-   * @param subsystem subsystem name
-   * @param name component name
-   */
-  void AddLW(Sendable* sendable, const wpi::Twine& subsystem,
-             const wpi::Twine& name);
-
-  /**
-   * Adds a child object to an object.  Adds the child object to the registry
-   * if it's not already present.
-   *
-   * @param parent parent object
-   * @param child child object
-   */
-  void AddChild(Sendable* parent, Sendable* child);
-
-  /**
-   * Adds a child object to an object.  Adds the child object to the registry
-   * if it's not already present.
-   *
-   * @param parent parent object
-   * @param child child object
-   */
-  void AddChild(Sendable* parent, void* child);
-
-  /**
-   * Removes an object from the registry.
-   *
-   * @param sendable object to remove
-   * @return true if the object was removed; false if it was not present
-   */
-  bool Remove(Sendable* sendable);
-
-  /**
-   * Moves an object in the registry (for use in move constructors/assignments).
-   *
-   * @param to new object
-   * @param from old object
-   */
-  void Move(Sendable* to, Sendable* from);
-
-  /**
-   * Determines if an object is in the registry.
-   *
-   * @param sendable object to check
-   * @return True if in registry, false if not.
-   */
-  bool Contains(const Sendable* sendable) const;
-
-  /**
-   * Gets the name of an object.
-   *
-   * @param sendable object
-   * @return Name (empty if object is not in registry)
-   */
-  std::string GetName(const Sendable* sendable) const;
-
-  /**
-   * Sets the name of an object.
-   *
-   * @param sendable object
-   * @param name name
-   */
-  void SetName(Sendable* sendable, const wpi::Twine& name);
-
-  /**
-   * Sets the name of an object with a channel number.
-   *
-   * @param sendable   object
-   * @param moduleType A string that defines the module name in the label for
-   *                   the value
-   * @param channel    The channel number the device is plugged into
-   */
-  void SetName(Sendable* sendable, const wpi::Twine& moduleType, int channel);
-
-  /**
-   * Sets the name of an object with a module and channel number.
-   *
-   * @param sendable     object
-   * @param moduleType   A string that defines the module name in the label for
-   *                     the value
-   * @param moduleNumber The number of the particular module type
-   * @param channel      The channel number the device is plugged into
-   */
-  void SetName(Sendable* sendable, const wpi::Twine& moduleType,
-               int moduleNumber, int channel);
-
-  /**
-   * Sets both the subsystem name and device name of an object.
-   *
-   * @param sendable object
-   * @param subsystem subsystem name
-   * @param name device name
-   */
-  void SetName(Sendable* sendable, const wpi::Twine& subsystem,
-               const wpi::Twine& name);
-
-  /**
-   * Gets the subsystem name of an object.
-   *
-   * @param sendable object
-   * @return Subsystem name (empty if object is not in registry)
-   */
-  std::string GetSubsystem(const Sendable* sendable) const;
-
-  /**
-   * Sets the subsystem name of an object.
-   *
-   * @param sendable object
-   * @param subsystem subsystem name
-   */
-  void SetSubsystem(Sendable* sendable, const wpi::Twine& subsystem);
-
-  /**
-   * Gets a unique handle for setting/getting data with SetData() and GetData().
-   *
-   * @return Handle
-   */
-  int GetDataHandle();
-
-  /**
-   * Associates arbitrary data with an object in the registry.
-   *
-   * @param sendable object
-   * @param handle data handle returned by GetDataHandle()
-   * @param data data to set
-   * @return Previous data (may be null)
-   */
-  std::shared_ptr<void> SetData(Sendable* sendable, int handle,
-                                std::shared_ptr<void> data);
-
-  /**
-   * Gets arbitrary data associated with an object in the registry.
-   *
-   * @param sendable object
-   * @param handle data handle returned by GetDataHandle()
-   * @return data (may be null if none associated)
-   */
-  std::shared_ptr<void> GetData(Sendable* sendable, int handle);
-
-  /**
-   * Enables LiveWindow for an object.
-   *
-   * @param sendable object
-   */
-  void EnableLiveWindow(Sendable* sendable);
-
-  /**
-   * Disables LiveWindow for an object.
-   *
-   * @param sendable object
-   */
-  void DisableLiveWindow(Sendable* sendable);
-
-  /**
-   * Get unique id for an object.  Since objects can move, use this instead
-   * of storing Sendable* directly if ownership is in question.
-   *
-   * @param sendable object
-   * @return unique id
-   */
-  UID GetUniqueId(Sendable* sendable);
-
-  /**
-   * Get sendable object for a given unique id.
-   *
-   * @param uid unique id
-   * @return sendable object (may be null)
-   */
-  Sendable* GetSendable(UID uid);
-
-  /**
-   * Publishes an object in the registry to a network table.
-   *
-   * @param sendableUid sendable unique id
-   * @param table network table
-   */
-  void Publish(UID sendableUid, std::shared_ptr<NetworkTable> table);
-
-  /**
-   * Updates network table information from an object.
-   *
-   * @param sendableUid sendable unique id
-   */
-  void Update(UID sendableUid);
-
-  /**
-   * Data passed to ForeachLiveWindow() callback function
-   */
-  struct CallbackData {
-    CallbackData(Sendable* sendable_, wpi::StringRef name_,
-                 wpi::StringRef subsystem_, Sendable* parent_,
-                 std::shared_ptr<void>& data_, SendableBuilderImpl& builder_)
-        : sendable(sendable_),
-          name(name_),
-          subsystem(subsystem_),
-          parent(parent_),
-          data(data_),
-          builder(builder_) {}
-
-    Sendable* sendable;
-    wpi::StringRef name;
-    wpi::StringRef subsystem;
-    Sendable* parent;
-    std::shared_ptr<void>& data;
-    SendableBuilderImpl& builder;
-  };
-
-  /**
-   * Iterates over LiveWindow-enabled objects in the registry.
-   * It is *not* safe to call other SendableRegistry functions from the
-   * callback (this will likely deadlock).
-   *
-   * @param dataHandle data handle to get data pointer passed to callback
-   * @param callback function to call for each object
-   */
-  void ForeachLiveWindow(
-      int dataHandle,
-      wpi::function_ref<void(CallbackData& cbdata)> callback) const;
-
- private:
-  SendableRegistry();
-
-  struct Impl;
-  std::unique_ptr<Impl> m_impl;
-};
-
-}  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/smartdashboard/SmartDashboard.h b/wpilibc/src/main/native/include/frc/smartdashboard/SmartDashboard.h
index 9fdc049..47c4a28 100644
--- a/wpilibc/src/main/native/include/frc/smartdashboard/SmartDashboard.h
+++ b/wpilibc/src/main/native/include/frc/smartdashboard/SmartDashboard.h
@@ -1,30 +1,28 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2019 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
 #include <memory>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableValue.h>
+#include <wpi/span.h>
 
-#include "frc/ErrorBase.h"
-#include "frc/smartdashboard/ListenerExecutor.h"
-#include "frc/smartdashboard/Sendable.h"
-#include "frc/smartdashboard/SendableHelper.h"
+namespace wpi {
+class Sendable;
+}  // namespace wpi
 
 namespace frc {
 
-class SmartDashboard : public ErrorBase,
-                       public Sendable,
-                       public SendableHelper<SmartDashboard> {
+class SmartDashboard {
  public:
+  SmartDashboard() = delete;
+
   static void init();
 
   /**
@@ -33,7 +31,7 @@
    * @param key the key to search for
    * @return true if the table as a value assigned to the given key
    */
-  static bool ContainsKey(wpi::StringRef key);
+  static bool ContainsKey(std::string_view key);
 
   /**
    * @param types bitmask of types; 0 is treated as a "don't care".
@@ -46,7 +44,7 @@
    *
    * @param key the key to make persistent
    */
-  static void SetPersistent(wpi::StringRef key);
+  static void SetPersistent(std::string_view key);
 
   /**
    * Stop making a key's value persistent through program restarts.
@@ -54,7 +52,7 @@
    *
    * @param key the key name
    */
-  static void ClearPersistent(wpi::StringRef key);
+  static void ClearPersistent(std::string_view key);
 
   /**
    * Returns whether the value is persistent through program restarts.
@@ -62,7 +60,7 @@
    *
    * @param key the key name
    */
-  static bool IsPersistent(wpi::StringRef key);
+  static bool IsPersistent(std::string_view key);
 
   /**
    * Sets flags on the specified key in this table. The key can
@@ -71,7 +69,7 @@
    * @param key the key name
    * @param flags the flags to set (bitmask)
    */
-  static void SetFlags(wpi::StringRef key, unsigned int flags);
+  static void SetFlags(std::string_view key, unsigned int flags);
 
   /**
    * Clears flags on the specified key in this table. The key can
@@ -80,7 +78,7 @@
    * @param key the key name
    * @param flags the flags to clear (bitmask)
    */
-  static void ClearFlags(wpi::StringRef key, unsigned int flags);
+  static void ClearFlags(std::string_view key, unsigned int flags);
 
   /**
    * Returns the flags for the specified key.
@@ -88,14 +86,14 @@
    * @param key the key name
    * @return the flags, or 0 if the key is not defined
    */
-  static unsigned int GetFlags(wpi::StringRef key);
+  static unsigned int GetFlags(std::string_view key);
 
   /**
    * Deletes the specified key in this table.
    *
    * @param key the key name
    */
-  static void Delete(wpi::StringRef key);
+  static void Delete(std::string_view key);
 
   /**
    * Returns an NT Entry mapping to the specified key
@@ -105,7 +103,7 @@
    * @param key the key
    * @return    the entry for the key
    */
-  static nt::NetworkTableEntry GetEntry(wpi::StringRef key);
+  static nt::NetworkTableEntry GetEntry(std::string_view key);
 
   /**
    * Maps the specified key to the specified value in this table.
@@ -116,10 +114,10 @@
    * In order for the value to appear in the dashboard, it must be registered
    * with SendableRegistry.  WPILib components do this automatically.
    *
-   * @param keyName the key
-   * @param value   the value
+   * @param key  the key
+   * @param data the value
    */
-  static void PutData(wpi::StringRef key, Sendable* data);
+  static void PutData(std::string_view key, wpi::Sendable* data);
 
   /**
    * Maps the specified key (where the key is the name of the Sendable)
@@ -133,7 +131,7 @@
    *
    * @param value the value
    */
-  static void PutData(Sendable* value);
+  static void PutData(wpi::Sendable* value);
 
   /**
    * Returns the value at the specified key.
@@ -141,7 +139,7 @@
    * @param keyName the key
    * @return the value
    */
-  static Sendable* GetData(wpi::StringRef keyName);
+  static wpi::Sendable* GetData(std::string_view keyName);
 
   /**
    * Maps the specified key to the specified value in this table.
@@ -153,7 +151,7 @@
    * @param value   the value
    * @return        False if the table key already exists with a different type
    */
-  static bool PutBoolean(wpi::StringRef keyName, bool value);
+  static bool PutBoolean(std::string_view keyName, bool value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -161,7 +159,7 @@
    * @param defaultValue the default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultBoolean(wpi::StringRef key, bool defaultValue);
+  static bool SetDefaultBoolean(std::string_view key, bool defaultValue);
 
   /**
    * Returns the value at the specified key.
@@ -169,9 +167,10 @@
    * If the key is not found, returns the default value.
    *
    * @param keyName the key
+   * @param defaultValue the default value to set if key doesn't exist
    * @return the value
    */
-  static bool GetBoolean(wpi::StringRef keyName, bool defaultValue);
+  static bool GetBoolean(std::string_view keyName, bool defaultValue);
 
   /**
    * Maps the specified key to the specified value in this table.
@@ -183,7 +182,7 @@
    * @param value   the value
    * @return        False if the table key already exists with a different type
    */
-  static bool PutNumber(wpi::StringRef keyName, double value);
+  static bool PutNumber(std::string_view keyName, double value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -192,7 +191,7 @@
    * @param defaultValue The default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultNumber(wpi::StringRef key, double defaultValue);
+  static bool SetDefaultNumber(std::string_view key, double defaultValue);
 
   /**
    * Returns the value at the specified key.
@@ -200,9 +199,10 @@
    * If the key is not found, returns the default value.
    *
    * @param keyName the key
+   * @param defaultValue the default value to set if the key doesn't exist
    * @return the value
    */
-  static double GetNumber(wpi::StringRef keyName, double defaultValue);
+  static double GetNumber(std::string_view keyName, double defaultValue);
 
   /**
    * Maps the specified key to the specified value in this table.
@@ -214,7 +214,7 @@
    * @param value   the value
    * @return        False if the table key already exists with a different type
    */
-  static bool PutString(wpi::StringRef keyName, wpi::StringRef value);
+  static bool PutString(std::string_view keyName, std::string_view value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -223,7 +223,8 @@
    * @param defaultValue the default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultString(wpi::StringRef key, wpi::StringRef defaultValue);
+  static bool SetDefaultString(std::string_view key,
+                               std::string_view defaultValue);
 
   /**
    * Returns the value at the specified key.
@@ -231,10 +232,11 @@
    * If the key is not found, returns the default value.
    *
    * @param keyName the key
+   * @param defaultValue the default value to set if the key doesn't exist
    * @return the value
    */
-  static std::string GetString(wpi::StringRef keyName,
-                               wpi::StringRef defaultValue);
+  static std::string GetString(std::string_view keyName,
+                               std::string_view defaultValue);
 
   /**
    * Put a boolean array in the table.
@@ -247,7 +249,7 @@
    *       std::vector<bool> is special-cased in C++. 0 is false, any
    *       non-zero value is true.
    */
-  static bool PutBooleanArray(wpi::StringRef key, wpi::ArrayRef<int> value);
+  static bool PutBooleanArray(std::string_view key, wpi::span<const int> value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -256,8 +258,8 @@
    * @param defaultValue the default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultBooleanArray(wpi::StringRef key,
-                                     wpi::ArrayRef<int> defaultValue);
+  static bool SetDefaultBooleanArray(std::string_view key,
+                                     wpi::span<const int> defaultValue);
 
   /**
    * Returns the boolean array the key maps to.
@@ -277,8 +279,8 @@
    *       because std::vector<bool> is special-cased in C++. 0 is false, any
    *       non-zero value is true.
    */
-  static std::vector<int> GetBooleanArray(wpi::StringRef key,
-                                          wpi::ArrayRef<int> defaultValue);
+  static std::vector<int> GetBooleanArray(std::string_view key,
+                                          wpi::span<const int> defaultValue);
 
   /**
    * Put a number array in the table.
@@ -287,7 +289,8 @@
    * @param value The value that will be assigned.
    * @return False if the table key already exists with a different type
    */
-  static bool PutNumberArray(wpi::StringRef key, wpi::ArrayRef<double> value);
+  static bool PutNumberArray(std::string_view key,
+                             wpi::span<const double> value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -296,8 +299,8 @@
    * @param defaultValue The default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultNumberArray(wpi::StringRef key,
-                                    wpi::ArrayRef<double> defaultValue);
+  static bool SetDefaultNumberArray(std::string_view key,
+                                    wpi::span<const double> defaultValue);
 
   /**
    * Returns the number array the key maps to.
@@ -313,8 +316,8 @@
    * @note This makes a copy of the array. If the overhead of this is a concern,
    *       use GetValue() instead.
    */
-  static std::vector<double> GetNumberArray(wpi::StringRef key,
-                                            wpi::ArrayRef<double> defaultValue);
+  static std::vector<double> GetNumberArray(
+      std::string_view key, wpi::span<const double> defaultValue);
 
   /**
    * Put a string array in the table.
@@ -323,8 +326,8 @@
    * @param value The value that will be assigned.
    * @return False if the table key already exists with a different type
    */
-  static bool PutStringArray(wpi::StringRef key,
-                             wpi::ArrayRef<std::string> value);
+  static bool PutStringArray(std::string_view key,
+                             wpi::span<const std::string> value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -333,8 +336,8 @@
    * @param defaultValue The default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultStringArray(wpi::StringRef key,
-                                    wpi::ArrayRef<std::string> defaultValue);
+  static bool SetDefaultStringArray(std::string_view key,
+                                    wpi::span<const std::string> defaultValue);
 
   /**
    * Returns the string array the key maps to.
@@ -351,7 +354,7 @@
    *       use GetValue() instead.
    */
   static std::vector<std::string> GetStringArray(
-      wpi::StringRef key, wpi::ArrayRef<std::string> defaultValue);
+      std::string_view key, wpi::span<const std::string> defaultValue);
 
   /**
    * Put a raw value (byte array) in the table.
@@ -360,7 +363,7 @@
    * @param value The value that will be assigned.
    * @return False if the table key already exists with a different type
    */
-  static bool PutRaw(wpi::StringRef key, wpi::StringRef value);
+  static bool PutRaw(std::string_view key, std::string_view value);
 
   /**
    * Gets the current value in the table, setting it if it does not exist.
@@ -369,7 +372,8 @@
    * @param defaultValue The default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultRaw(wpi::StringRef key, wpi::StringRef defaultValue);
+  static bool SetDefaultRaw(std::string_view key,
+                            std::string_view defaultValue);
 
   /**
    * Returns the raw value (byte array) the key maps to.
@@ -385,7 +389,8 @@
    * @note This makes a copy of the raw contents. If the overhead of this is a
    *       concern, use GetValue() instead.
    */
-  static std::string GetRaw(wpi::StringRef key, wpi::StringRef defaultValue);
+  static std::string GetRaw(std::string_view key,
+                            std::string_view defaultValue);
 
   /**
    * Maps the specified key to the specified complex value (such as an array) in
@@ -398,7 +403,7 @@
    * @param value   the value
    * @return        False if the table key already exists with a different type
    */
-  static bool PutValue(wpi::StringRef keyName,
+  static bool PutValue(std::string_view keyName,
                        std::shared_ptr<nt::Value> value);
 
   /**
@@ -408,7 +413,7 @@
    * @param defaultValue The default value to set if key doesn't exist.
    * @returns False if the table key exists with a different type
    */
-  static bool SetDefaultValue(wpi::StringRef key,
+  static bool SetDefaultValue(std::string_view key,
                               std::shared_ptr<nt::Value> defaultValue);
 
   /**
@@ -416,14 +421,12 @@
    * complex data object.
    *
    * @param keyName the key
-   * @param value   the object to retrieve the value into
    */
-  static std::shared_ptr<nt::Value> GetValue(wpi::StringRef keyName);
+  static std::shared_ptr<nt::Value> GetValue(std::string_view keyName);
 
   /**
    * Posts a task from a listener to the ListenerExecutor, so that it can be run
-   * synchronously from the main loop on the next call to {@link
-   * SmartDashboard#updateValues()}.
+   * synchronously from the main loop on the next call to updateValues().
    *
    * @param task The task to run synchronously from the main thread.
    */
@@ -433,11 +436,6 @@
    * Puts all sendable data to the dashboard.
    */
   static void UpdateValues();
-
- private:
-  virtual ~SmartDashboard() = default;
-
-  static detail::ListenerExecutor listenerExecutor;
 };
 
 }  // namespace frc
diff --git a/wpilibc/src/main/native/include/frc/util/Color.h b/wpilibc/src/main/native/include/frc/util/Color.h
index 1321380..00bc4af 100644
--- a/wpilibc/src/main/native/include/frc/util/Color.h
+++ b/wpilibc/src/main/native/include/frc/util/Color.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -23,17 +20,17 @@
    */
 
   /**
-   * #1560BD.
+   * 0x1560BD.
    */
   static const Color kDenim;
 
   /**
-   * #0066B3.
+   * 0x0066B3.
    */
   static const Color kFirstBlue;
 
   /**
-   * #ED1C24.
+   * 0xED1C24.
    */
   static const Color kFirstRed;
 
@@ -42,702 +39,702 @@
    */
 
   /**
-   * #F0F8FF.
+   * 0xF0F8FF.
    */
   static const Color kAliceBlue;
 
   /**
-   * #FAEBD7.
+   * 0xFAEBD7.
    */
   static const Color kAntiqueWhite;
 
   /**
-   * #00FFFF.
+   * 0x00FFFF.
    */
   static const Color kAqua;
 
   /**
-   * #7FFFD4.
+   * 0x7FFFD4.
    */
   static const Color kAquamarine;
 
   /**
-   * #F0FFFF.
+   * 0xF0FFFF.
    */
   static const Color kAzure;
 
   /**
-   * #F5F5DC.
+   * 0xF5F5DC.
    */
   static const Color kBeige;
 
   /**
-   * #FFE4C4.
+   * 0xFFE4C4.
    */
   static const Color kBisque;
 
   /**
-   * #000000.
+   * 0x000000.
    */
   static const Color kBlack;
 
   /**
-   * #FFEBCD.
+   * 0xFFEBCD.
    */
   static const Color kBlanchedAlmond;
 
   /**
-   * #0000FF.
+   * 0x0000FF.
    */
   static const Color kBlue;
 
   /**
-   * #8A2BE2.
+   * 0x8A2BE2.
    */
   static const Color kBlueViolet;
 
   /**
-   * #A52A2A.
+   * 0xA52A2A.
    */
   static const Color kBrown;
 
   /**
-   * #DEB887.
+   * 0xDEB887.
    */
   static const Color kBurlywood;
 
   /**
-   * #5F9EA0.
+   * 0x5F9EA0.
    */
   static const Color kCadetBlue;
 
   /**
-   * #7FFF00.
+   * 0x7FFF00.
    */
   static const Color kChartreuse;
 
   /**
-   * #D2691E.
+   * 0xD2691E.
    */
   static const Color kChocolate;
 
   /**
-   * #FF7F50.
+   * 0xFF7F50.
    */
   static const Color kCoral;
 
   /**
-   * #6495ED.
+   * 0x6495ED.
    */
   static const Color kCornflowerBlue;
 
   /**
-   * #FFF8DC.
+   * 0xFFF8DC.
    */
   static const Color kCornsilk;
 
   /**
-   * #DC143C.
+   * 0xDC143C.
    */
   static const Color kCrimson;
 
   /**
-   * #00FFFF.
+   * 0x00FFFF.
    */
   static const Color kCyan;
 
   /**
-   * #00008B.
+   * 0x00008B.
    */
   static const Color kDarkBlue;
 
   /**
-   * #008B8B.
+   * 0x008B8B.
    */
   static const Color kDarkCyan;
 
   /**
-   * #B8860B.
+   * 0xB8860B.
    */
   static const Color kDarkGoldenrod;
 
   /**
-   * #A9A9A9.
+   * 0xA9A9A9.
    */
   static const Color kDarkGray;
 
   /**
-   * #006400.
+   * 0x006400.
    */
   static const Color kDarkGreen;
 
   /**
-   * #BDB76B.
+   * 0xBDB76B.
    */
   static const Color kDarkKhaki;
 
   /**
-   * #8B008B.
+   * 0x8B008B.
    */
   static const Color kDarkMagenta;
 
   /**
-   * #556B2F.
+   * 0x556B2F.
    */
   static const Color kDarkOliveGreen;
 
   /**
-   * #FF8C00.
+   * 0xFF8C00.
    */
   static const Color kDarkOrange;
 
   /**
-   * #9932CC.
+   * 0x9932CC.
    */
   static const Color kDarkOrchid;
 
   /**
-   * #8B0000.
+   * 0x8B0000.
    */
   static const Color kDarkRed;
 
   /**
-   * #E9967A.
+   * 0xE9967A.
    */
   static const Color kDarkSalmon;
 
   /**
-   * #8FBC8F.
+   * 0x8FBC8F.
    */
   static const Color kDarkSeaGreen;
 
   /**
-   * #483D8B.
+   * 0x483D8B.
    */
   static const Color kDarkSlateBlue;
 
   /**
-   * #2F4F4F.
+   * 0x2F4F4F.
    */
   static const Color kDarkSlateGray;
 
   /**
-   * #00CED1.
+   * 0x00CED1.
    */
   static const Color kDarkTurquoise;
 
   /**
-   * #9400D3.
+   * 0x9400D3.
    */
   static const Color kDarkViolet;
 
   /**
-   * #FF1493.
+   * 0xFF1493.
    */
   static const Color kDeepPink;
 
   /**
-   * #00BFFF.
+   * 0x00BFFF.
    */
   static const Color kDeepSkyBlue;
 
   /**
-   * #696969.
+   * 0x696969.
    */
   static const Color kDimGray;
 
   /**
-   * #1E90FF.
+   * 0x1E90FF.
    */
   static const Color kDodgerBlue;
 
   /**
-   * #B22222.
+   * 0xB22222.
    */
   static const Color kFirebrick;
 
   /**
-   * #FFFAF0.
+   * 0xFFFAF0.
    */
   static const Color kFloralWhite;
 
   /**
-   * #228B22.
+   * 0x228B22.
    */
   static const Color kForestGreen;
 
   /**
-   * #FF00FF.
+   * 0xFF00FF.
    */
   static const Color kFuchsia;
 
   /**
-   * #DCDCDC.
+   * 0xDCDCDC.
    */
   static const Color kGainsboro;
 
   /**
-   * #F8F8FF.
+   * 0xF8F8FF.
    */
   static const Color kGhostWhite;
 
   /**
-   * #FFD700.
+   * 0xFFD700.
    */
   static const Color kGold;
 
   /**
-   * #DAA520.
+   * 0xDAA520.
    */
   static const Color kGoldenrod;
 
   /**
-   * #808080.
+   * 0x808080.
    */
   static const Color kGray;
 
   /**
-   * #008000.
+   * 0x008000.
    */
   static const Color kGreen;
 
   /**
-   * #ADFF2F.
+   * 0xADFF2F.
    */
   static const Color kGreenYellow;
 
   /**
-   * #F0FFF0.
+   * 0xF0FFF0.
    */
   static const Color kHoneydew;
 
   /**
-   * #FF69B4.
+   * 0xFF69B4.
    */
   static const Color kHotPink;
 
   /**
-   * #CD5C5C.
+   * 0xCD5C5C.
    */
   static const Color kIndianRed;
 
   /**
-   * #4B0082.
+   * 0x4B0082.
    */
   static const Color kIndigo;
 
   /**
-   * #FFFFF0.
+   * 0xFFFFF0.
    */
   static const Color kIvory;
 
   /**
-   * #F0E68C.
+   * 0xF0E68C.
    */
   static const Color kKhaki;
 
   /**
-   * #E6E6FA.
+   * 0xE6E6FA.
    */
   static const Color kLavender;
 
   /**
-   * #FFF0F5.
+   * 0xFFF0F5.
    */
   static const Color kLavenderBlush;
 
   /**
-   * #7CFC00.
+   * 0x7CFC00.
    */
   static const Color kLawnGreen;
 
   /**
-   * #FFFACD.
+   * 0xFFFACD.
    */
   static const Color kLemonChiffon;
 
   /**
-   * #ADD8E6.
+   * 0xADD8E6.
    */
   static const Color kLightBlue;
 
   /**
-   * #F08080.
+   * 0xF08080.
    */
   static const Color kLightCoral;
 
   /**
-   * #E0FFFF.
+   * 0xE0FFFF.
    */
   static const Color kLightCyan;
 
   /**
-   * #FAFAD2.
+   * 0xFAFAD2.
    */
   static const Color kLightGoldenrodYellow;
 
   /**
-   * #D3D3D3.
+   * 0xD3D3D3.
    */
   static const Color kLightGray;
 
   /**
-   * #90EE90.
+   * 0x90EE90.
    */
   static const Color kLightGreen;
 
   /**
-   * #FFB6C1.
+   * 0xFFB6C1.
    */
   static const Color kLightPink;
 
   /**
-   * #FFA07A.
+   * 0xFFA07A.
    */
   static const Color kLightSalmon;
 
   /**
-   * #20B2AA.
+   * 0x20B2AA.
    */
   static const Color kLightSeaGreen;
 
   /**
-   * #87CEFA.
+   * 0x87CEFA.
    */
   static const Color kLightSkyBlue;
 
   /**
-   * #778899.
+   * 0x778899.
    */
   static const Color kLightSlateGray;
 
   /**
-   * #B0C4DE.
+   * 0xB0C4DE.
    */
   static const Color kLightSteelBlue;
 
   /**
-   * #FFFFE0.
+   * 0xFFFFE0.
    */
   static const Color kLightYellow;
 
   /**
-   * #00FF00.
+   * 0x00FF00.
    */
   static const Color kLime;
 
   /**
-   * #32CD32.
+   * 0x32CD32.
    */
   static const Color kLimeGreen;
 
   /**
-   * #FAF0E6.
+   * 0xFAF0E6.
    */
   static const Color kLinen;
 
   /**
-   * #FF00FF.
+   * 0xFF00FF.
    */
   static const Color kMagenta;
 
   /**
-   * #800000.
+   * 0x800000.
    */
   static const Color kMaroon;
 
   /**
-   * #66CDAA.
+   * 0x66CDAA.
    */
   static const Color kMediumAquamarine;
 
   /**
-   * #0000CD.
+   * 0x0000CD.
    */
   static const Color kMediumBlue;
 
   /**
-   * #BA55D3.
+   * 0xBA55D3.
    */
   static const Color kMediumOrchid;
 
   /**
-   * #9370DB.
+   * 0x9370DB.
    */
   static const Color kMediumPurple;
 
   /**
-   * #3CB371.
+   * 0x3CB371.
    */
   static const Color kMediumSeaGreen;
 
   /**
-   * #7B68EE.
+   * 0x7B68EE.
    */
   static const Color kMediumSlateBlue;
 
   /**
-   * #00FA9A.
+   * 0x00FA9A.
    */
   static const Color kMediumSpringGreen;
 
   /**
-   * #48D1CC.
+   * 0x48D1CC.
    */
   static const Color kMediumTurquoise;
 
   /**
-   * #C71585.
+   * 0xC71585.
    */
   static const Color kMediumVioletRed;
 
   /**
-   * #191970.
+   * 0x191970.
    */
   static const Color kMidnightBlue;
 
   /**
-   * #F5FFFA.
+   * 0xF5FFFA.
    */
   static const Color kMintcream;
 
   /**
-   * #FFE4E1.
+   * 0xFFE4E1.
    */
   static const Color kMistyRose;
 
   /**
-   * #FFE4B5.
+   * 0xFFE4B5.
    */
   static const Color kMoccasin;
 
   /**
-   * #FFDEAD.
+   * 0xFFDEAD.
    */
   static const Color kNavajoWhite;
 
   /**
-   * #000080.
+   * 0x000080.
    */
   static const Color kNavy;
 
   /**
-   * #FDF5E6.
+   * 0xFDF5E6.
    */
   static const Color kOldLace;
 
   /**
-   * #808000.
+   * 0x808000.
    */
   static const Color kOlive;
 
   /**
-   * #6B8E23.
+   * 0x6B8E23.
    */
   static const Color kOliveDrab;
 
   /**
-   * #FFA500.
+   * 0xFFA500.
    */
   static const Color kOrange;
 
   /**
-   * #FF4500.
+   * 0xFF4500.
    */
   static const Color kOrangeRed;
 
   /**
-   * #DA70D6.
+   * 0xDA70D6.
    */
   static const Color kOrchid;
 
   /**
-   * #EEE8AA.
+   * 0xEEE8AA.
    */
   static const Color kPaleGoldenrod;
 
   /**
-   * #98FB98.
+   * 0x98FB98.
    */
   static const Color kPaleGreen;
 
   /**
-   * #AFEEEE.
+   * 0xAFEEEE.
    */
   static const Color kPaleTurquoise;
 
   /**
-   * #DB7093.
+   * 0xDB7093.
    */
   static const Color kPaleVioletRed;
 
   /**
-   * #FFEFD5.
+   * 0xFFEFD5.
    */
   static const Color kPapayaWhip;
 
   /**
-   * #FFDAB9.
+   * 0xFFDAB9.
    */
   static const Color kPeachPuff;
 
   /**
-   * #CD853F.
+   * 0xCD853F.
    */
   static const Color kPeru;
 
   /**
-   * #FFC0CB.
+   * 0xFFC0CB.
    */
   static const Color kPink;
 
   /**
-   * #DDA0DD.
+   * 0xDDA0DD.
    */
   static const Color kPlum;
 
   /**
-   * #B0E0E6.
+   * 0xB0E0E6.
    */
   static const Color kPowderBlue;
 
   /**
-   * #800080.
+   * 0x800080.
    */
   static const Color kPurple;
 
   /**
-   * #FF0000.
+   * 0xFF0000.
    */
   static const Color kRed;
 
   /**
-   * #BC8F8F.
+   * 0xBC8F8F.
    */
   static const Color kRosyBrown;
 
   /**
-   * #4169E1.
+   * 0x4169E1.
    */
   static const Color kRoyalBlue;
 
   /**
-   * #8B4513.
+   * 0x8B4513.
    */
   static const Color kSaddleBrown;
 
   /**
-   * #FA8072.
+   * 0xFA8072.
    */
   static const Color kSalmon;
 
   /**
-   * #F4A460.
+   * 0xF4A460.
    */
   static const Color kSandyBrown;
 
   /**
-   * #2E8B57.
+   * 0x2E8B57.
    */
   static const Color kSeaGreen;
 
   /**
-   * #FFF5EE.
+   * 0xFFF5EE.
    */
   static const Color kSeashell;
 
   /**
-   * #A0522D.
+   * 0xA0522D.
    */
   static const Color kSienna;
 
   /**
-   * #C0C0C0.
+   * 0xC0C0C0.
    */
   static const Color kSilver;
 
   /**
-   * #87CEEB.
+   * 0x87CEEB.
    */
   static const Color kSkyBlue;
 
   /**
-   * #6A5ACD.
+   * 0x6A5ACD.
    */
   static const Color kSlateBlue;
 
   /**
-   * #708090.
+   * 0x708090.
    */
   static const Color kSlateGray;
 
   /**
-   * #FFFAFA.
+   * 0xFFFAFA.
    */
   static const Color kSnow;
 
   /**
-   * #00FF7F.
+   * 0x00FF7F.
    */
   static const Color kSpringGreen;
 
   /**
-   * #4682B4.
+   * 0x4682B4.
    */
   static const Color kSteelBlue;
 
   /**
-   * #D2B48C.
+   * 0xD2B48C.
    */
   static const Color kTan;
 
   /**
-   * #008080.
+   * 0x008080.
    */
   static const Color kTeal;
 
   /**
-   * #D8BFD8.
+   * 0xD8BFD8.
    */
   static const Color kThistle;
 
   /**
-   * #FF6347.
+   * 0xFF6347.
    */
   static const Color kTomato;
 
   /**
-   * #40E0D0.
+   * 0x40E0D0.
    */
   static const Color kTurquoise;
 
   /**
-   * #EE82EE.
+   * 0xEE82EE.
    */
   static const Color kViolet;
 
   /**
-   * #F5DEB3.
+   * 0xF5DEB3.
    */
   static const Color kWheat;
 
   /**
-   * #FFFFFF.
+   * 0xFFFFFF.
    */
   static const Color kWhite;
 
   /**
-   * #F5F5F5.
+   * 0xF5F5F5.
    */
   static const Color kWhiteSmoke;
 
   /**
-   * #FFFF00.
+   * 0xFFFF00.
    */
   static const Color kYellow;
 
   /**
-   * #9ACD32.
+   * 0x9ACD32.
    */
   static const Color kYellowGreen;
 
@@ -746,9 +743,9 @@
   /**
    * Constructs a Color.
    *
-   * @param red Red value (0-1)
-   * @param green Green value (0-1)
-   * @param blue Blue value (0-1)
+   * @param r Red value (0-1)
+   * @param g Green value (0-1)
+   * @param b Blue value (0-1)
    */
   constexpr Color(double r, double g, double b)
       : red(roundAndClamp(r)),
@@ -809,6 +806,10 @@
   return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
 }
 
+inline bool operator!=(const Color& c1, const Color& c2) {
+  return !(c1 == c2);
+}
+
 /*
  * FIRST Colors
  */
diff --git a/wpilibc/src/main/native/include/frc/util/Color8Bit.h b/wpilibc/src/main/native/include/frc/util/Color8Bit.h
index d5dba07..62cbde9 100644
--- a/wpilibc/src/main/native/include/frc/util/Color8Bit.h
+++ b/wpilibc/src/main/native/include/frc/util/Color8Bit.h
@@ -1,9 +1,6 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
 
 #pragma once
 
@@ -23,9 +20,9 @@
   /**
    * Constructs a Color8Bit.
    *
-   * @param red Red value (0-255)
-   * @param green Green value (0-255)
-   * @param blue Blue value (0-255)
+   * @param r Red value (0-255)
+   * @param g Green value (0-255)
+   * @param b Blue value (0-255)
    */
   constexpr Color8Bit(int r, int g, int b)
       : red(std::clamp(r, 0, 255)),
@@ -37,12 +34,12 @@
    *
    * @param color The color
    */
-  constexpr Color8Bit(const Color& color)
+  constexpr Color8Bit(const Color& color)  // NOLINT
       : red(color.red * 255),
         green(color.green * 255),
         blue(color.blue * 255) {}
 
-  constexpr operator Color() const {
+  constexpr operator Color() const {  // NOLINT
     return Color(red / 255.0, green / 255.0, blue / 255.0);
   }
 
diff --git a/wpilibc/src/main/native/include/frc2/Timer.h b/wpilibc/src/main/native/include/frc2/Timer.h
deleted file mode 100644
index 8f943a6..0000000
--- a/wpilibc/src/main/native/include/frc2/Timer.h
+++ /dev/null
@@ -1,151 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-#pragma once
-
-#include <units/time.h>
-#include <wpi/mutex.h>
-
-namespace frc2 {
-
-/**
- * Pause the task for a specified time.
- *
- * Pause the execution of the program for a specified period of time given in
- * seconds. Motors will continue to run at their last assigned values, and
- * sensors will continue to update. Only the task containing the wait will pause
- * until the wait time is expired.
- *
- * @param seconds Length of time to pause, in seconds.
- */
-void Wait(units::second_t seconds);
-
-/**
- * @brief  Gives real-time clock system time with nanosecond resolution
- * @return The time, just in case you want the robot to start autonomous at 8pm
- *         on Saturday.
- */
-units::second_t GetTime();
-
-/**
- * A wrapper for the frc::Timer class that returns unit-typed values.
- */
-class Timer {
- public:
-  /**
-   * Create a new timer object.
-   *
-   * Create a new timer object and reset the time to zero. The timer is
-   * initially not running and must be started.
-   */
-  Timer();
-
-  virtual ~Timer() = default;
-
-  Timer(const Timer& rhs);
-  Timer& operator=(const Timer& rhs);
-  Timer(Timer&& rhs);
-  Timer& operator=(Timer&& rhs);
-
-  /**
-   * Get the current time from the timer. If the clock is running it is derived
-   * from the current system clock the start time stored in the timer class. If
-   * the clock is not running, then return the time when it was last stopped.
-   *
-   * @return Current time value for this timer in seconds
-   */
-  units::second_t Get() const;
-
-  /**
-   * Reset the timer by setting the time to 0.
-   *
-   * Make the timer startTime the current time so new requests will be relative
-   * to now.
-   */
-  void Reset();
-
-  /**
-   * Start the timer running.
-   *
-   * Just set the running flag to true indicating that all time requests should
-   * be relative to the system clock. Note that this method is a no-op if the
-   * timer is already running.
-   */
-  void Start();
-
-  /**
-   * Stop the timer.
-   *
-   * This computes the time as of now and clears the running flag, causing all
-   * subsequent time requests to be read from the accumulated time rather than
-   * looking at the system clock.
-   */
-  void Stop();
-
-  /**
-   * Check if the period specified has passed.
-   *
-   * @param seconds The period to check.
-   * @return        True if the period has passed.
-   */
-  bool HasElapsed(units::second_t period) const;
-
-  /**
-   * Check if the period specified has passed and if it has, advance the start
-   * time by that period. This is useful to decide if it's time to do periodic
-   * work without drifting later by the time it took to get around to checking.
-   *
-   * @param period The period to check for.
-   * @return       True if the period has passed.
-   */
-  bool HasPeriodPassed(units::second_t period);
-
-  /**
-   * Check if the period specified has passed and if it has, advance the start
-   * time by that period. This is useful to decide if it's time to do periodic
-   * work without drifting later by the time it took to get around to checking.
-   *
-   * @param period The period to check for.
-   * @return       True if the period has passed.
-   */
-  bool AdvanceIfElapsed(units::second_t period);
-
-  /**
-   * Return the FPGA system clock time in seconds.
-   *
-   * Return the time from the FPGA hardware clock in seconds since the FPGA
-   * started. Rolls over after 71 minutes.
-   *
-   * @returns Robot running time in seconds.
-   */
-  static units::second_t GetFPGATimestamp();
-
-  /**
-   * Return the approximate match time.
-   *
-   * The FMS does not send an official match time to the robots, but does send
-   * an approximate match time. The value will count down the time remaining in
-   * the current period (auto or teleop).
-   *
-   * Warning: This is not an official time (so it cannot be used to dispute ref
-   * calls or guarantee that a function will trigger before the match ends).
-   *
-   * The Practice Match function of the DS approximates the behavior seen on the
-   * field.
-   *
-   * @return Time remaining in current match period (auto or teleop)
-   */
-  static units::second_t GetMatchTime();
-
- private:
-  units::second_t m_startTime = 0_s;
-  units::second_t m_accumulatedTime = 0_s;
-  bool m_running = false;
-  mutable wpi::mutex m_mutex;
-};
-
-}  // namespace frc2