Split out statespace drivetrain code.
Change-Id: I02900583abfab39b2d85473bd245ffd6bf421d58
diff --git a/y2014/control_loops/drivetrain/ssdrivetrain.cc b/y2014/control_loops/drivetrain/ssdrivetrain.cc
new file mode 100644
index 0000000..53cc2dd
--- /dev/null
+++ b/y2014/control_loops/drivetrain/ssdrivetrain.cc
@@ -0,0 +1,181 @@
+#include "y2014/control_loops/drivetrain/ssdrivetrain.h"
+
+#include "aos/common/controls/polytope.h"
+#include "aos/common/commonmath.h"
+#include "aos/common/logging/matrix_logging.h"
+
+#include "frc971/control_loops/state_feedback_loop.h"
+#include "frc971/control_loops/coerce_goal.h"
+#include "y2014/constants.h"
+#include "y2014/control_loops/drivetrain/drivetrain.q.h"
+
+namespace frc971 {
+namespace control_loops {
+
+DrivetrainMotorsSS::LimitedDrivetrainLoop::LimitedDrivetrainLoop(
+ StateFeedbackLoop<4, 2, 2> &&loop)
+ : StateFeedbackLoop<4, 2, 2>(::std::move(loop)),
+ U_Poly_((Eigen::Matrix<double, 4, 2>() << 1, 0, -1, 0, 0, 1, 0, -1)
+ .finished(),
+ (Eigen::Matrix<double, 4, 1>() << 12.0, 12.0, 12.0, 12.0)
+ .finished()) {
+ ::aos::controls::HPolytope<0>::Init();
+ T << 1, -1, 1, 1;
+ T_inverse = T.inverse();
+}
+
+void DrivetrainMotorsSS::LimitedDrivetrainLoop::CapU() {
+ const Eigen::Matrix<double, 4, 1> error = R() - X_hat();
+
+ if (::std::abs(U(0, 0)) > 12.0 || ::std::abs(U(1, 0)) > 12.0) {
+ mutable_U() =
+ U() * 12.0 / ::std::max(::std::abs(U(0, 0)), ::std::abs(U(1, 0)));
+ LOG_MATRIX(DEBUG, "U is now", U());
+ // TODO(Austin): Figure out why the polytope stuff wasn't working and
+ // remove this hack.
+ output_was_capped_ = true;
+ return;
+
+ LOG_MATRIX(DEBUG, "U at start", U());
+ LOG_MATRIX(DEBUG, "R at start", R());
+ LOG_MATRIX(DEBUG, "Xhat at start", X_hat());
+
+ Eigen::Matrix<double, 2, 2> position_K;
+ position_K << K(0, 0), K(0, 2), K(1, 0), K(1, 2);
+ Eigen::Matrix<double, 2, 2> velocity_K;
+ velocity_K << K(0, 1), K(0, 3), K(1, 1), K(1, 3);
+
+ Eigen::Matrix<double, 2, 1> position_error;
+ position_error << error(0, 0), error(2, 0);
+ const auto drive_error = T_inverse * position_error;
+ Eigen::Matrix<double, 2, 1> velocity_error;
+ velocity_error << error(1, 0), error(3, 0);
+ LOG_MATRIX(DEBUG, "error", error);
+
+ const auto &poly = U_Poly_;
+ const Eigen::Matrix<double, 4, 2> pos_poly_H = poly.H() * position_K * T;
+ const Eigen::Matrix<double, 4, 1> pos_poly_k =
+ poly.k() - poly.H() * velocity_K * velocity_error;
+ const ::aos::controls::HPolytope<2> pos_poly(pos_poly_H, pos_poly_k);
+
+ Eigen::Matrix<double, 2, 1> adjusted_pos_error;
+ {
+ const auto &P = drive_error;
+
+ Eigen::Matrix<double, 1, 2> L45;
+ L45 << ::aos::sign(P(1, 0)), -::aos::sign(P(0, 0));
+ const double w45 = 0;
+
+ Eigen::Matrix<double, 1, 2> LH;
+ if (::std::abs(P(0, 0)) > ::std::abs(P(1, 0))) {
+ LH << 0, 1;
+ } else {
+ LH << 1, 0;
+ }
+ const double wh = LH.dot(P);
+
+ Eigen::Matrix<double, 2, 2> standard;
+ standard << L45, LH;
+ Eigen::Matrix<double, 2, 1> W;
+ W << w45, wh;
+ const Eigen::Matrix<double, 2, 1> intersection = standard.inverse() * W;
+
+ bool is_inside_h;
+ const auto adjusted_pos_error_h =
+ DoCoerceGoal(pos_poly, LH, wh, drive_error, &is_inside_h);
+ const auto adjusted_pos_error_45 =
+ DoCoerceGoal(pos_poly, L45, w45, intersection, nullptr);
+ if (pos_poly.IsInside(intersection)) {
+ adjusted_pos_error = adjusted_pos_error_h;
+ } else {
+ if (is_inside_h) {
+ if (adjusted_pos_error_h.norm() > adjusted_pos_error_45.norm()) {
+ adjusted_pos_error = adjusted_pos_error_h;
+ } else {
+ adjusted_pos_error = adjusted_pos_error_45;
+ }
+ } else {
+ adjusted_pos_error = adjusted_pos_error_45;
+ }
+ }
+ }
+
+ LOG_MATRIX(DEBUG, "adjusted_pos_error", adjusted_pos_error);
+ mutable_U() =
+ velocity_K * velocity_error + position_K * T * adjusted_pos_error;
+ LOG_MATRIX(DEBUG, "U is now", U());
+ } else {
+ output_was_capped_ = false;
+ }
+}
+
+DrivetrainMotorsSS::DrivetrainMotorsSS()
+ : loop_(new LimitedDrivetrainLoop(
+ constants::GetValues().make_drivetrain_loop())),
+ filtered_offset_(0.0),
+ gyro_(0.0),
+ left_goal_(0.0),
+ right_goal_(0.0),
+ raw_left_(0.0),
+ raw_right_(0.0) {
+ // High gear on both.
+ loop_->set_controller_index(3);
+}
+
+void DrivetrainMotorsSS::SetGoal(double left, double left_velocity,
+ double right, double right_velocity) {
+ left_goal_ = left;
+ right_goal_ = right;
+ loop_->mutable_R() << left, left_velocity, right, right_velocity;
+}
+void DrivetrainMotorsSS::SetRawPosition(double left, double right) {
+ raw_right_ = right;
+ raw_left_ = left;
+ Eigen::Matrix<double, 2, 1> Y;
+ Y << left + filtered_offset_, right - filtered_offset_;
+ loop_->Correct(Y);
+}
+void DrivetrainMotorsSS::SetPosition(double left, double right, double gyro) {
+ // Decay the offset quickly because this gyro is great.
+ const double offset =
+ (right - left - gyro * constants::GetValues().turn_width) / 2.0;
+ filtered_offset_ = 0.25 * offset + 0.75 * filtered_offset_;
+ gyro_ = gyro;
+ SetRawPosition(left, right);
+}
+
+void DrivetrainMotorsSS::SetExternalMotors(double left_voltage,
+ double right_voltage) {
+ loop_->mutable_U() << left_voltage, right_voltage;
+}
+
+void DrivetrainMotorsSS::Update(bool stop_motors, bool enable_control_loop) {
+ if (enable_control_loop) {
+ loop_->Update(stop_motors);
+ } else {
+ if (stop_motors) {
+ loop_->mutable_U().setZero();
+ loop_->mutable_U_uncapped().setZero();
+ }
+ loop_->UpdateObserver();
+ }
+ ::Eigen::Matrix<double, 4, 1> E = loop_->R() - loop_->X_hat();
+ LOG_MATRIX(DEBUG, "E", E);
+}
+
+double DrivetrainMotorsSS::GetEstimatedRobotSpeed() const {
+ // lets just call the average of left and right velocities close enough
+ return (loop_->X_hat(1, 0) + loop_->X_hat(3, 0)) / 2;
+}
+
+void DrivetrainMotorsSS::SendMotors(DrivetrainQueue::Output *output) const {
+ if (output) {
+ output->left_voltage = loop_->U(0, 0);
+ output->right_voltage = loop_->U(1, 0);
+ output->left_high = true;
+ output->right_high = true;
+ }
+}
+
+} // namespace control_loops
+} // namespace frc971