Add code for prototyping with the 2012 drivebase

Change-Id: I16b5b2e9982f1911b410c25872eca7a00fa561f3
diff --git a/y2012/control_loops/drivetrain/drivetrain.h b/y2012/control_loops/drivetrain/drivetrain.h
new file mode 100644
index 0000000..6fcbca7
--- /dev/null
+++ b/y2012/control_loops/drivetrain/drivetrain.h
@@ -0,0 +1,55 @@
+#ifndef Y2014_CONTROL_LOOPS_DRIVETRAIN_H_
+#define Y2014_CONTROL_LOOPS_DRIVETRAIN_H_
+
+#include "Eigen/Dense"
+
+#include "aos/common/controls/polytope.h"
+#include "aos/common/controls/control_loop.h"
+#include "aos/common/controls/polytope.h"
+#include "y2012/control_loops/drivetrain/drivetrain.q.h"
+#include "y2012/control_loops/drivetrain/polydrivetrain.h"
+#include "y2012/control_loops/drivetrain/ssdrivetrain.h"
+#include "aos/common/util/log_interval.h"
+
+namespace y2012 {
+namespace control_loops {
+namespace drivetrain {
+
+class DrivetrainLoop : public aos::controls::ControlLoop<
+                           ::y2012::control_loops::DrivetrainQueue> {
+ public:
+  // Constructs a control loop which can take a Drivetrain or defaults to the
+  // drivetrain at y2012::control_loops::drivetrain
+  explicit DrivetrainLoop(
+      ::y2012::control_loops::DrivetrainQueue *my_drivetrain =
+          &::y2012::control_loops::drivetrain_queue);
+
+ protected:
+  // Executes one cycle of the control loop.
+  virtual void RunIteration(
+      const ::y2012::control_loops::DrivetrainQueue::Goal *goal,
+      const ::y2012::control_loops::DrivetrainQueue::Position *position,
+      ::y2012::control_loops::DrivetrainQueue::Output *output,
+      ::y2012::control_loops::DrivetrainQueue::Status *status);
+
+  typedef ::aos::util::SimpleLogInterval SimpleLogInterval;
+  SimpleLogInterval no_position_ = SimpleLogInterval(
+      ::aos::time::Time::InSeconds(0.25), WARNING, "no position");
+  double last_gyro_heading_ = 0.0;
+  double last_gyro_rate_ = 0.0;
+
+  PolyDrivetrain dt_openloop_;
+  DrivetrainMotorsSS dt_closedloop_;
+  StateFeedbackLoop<7, 2, 3> kf_;
+
+  double last_left_voltage_ = 0;
+  double last_right_voltage_ = 0;
+
+  double integrated_kf_heading_ = 0;
+};
+
+}  // namespace drivetrain
+}  // namespace control_loops
+}  // namespace y2012
+
+#endif  // Y2014_CONTROL_LOOPS_DRIVETRAIN_H_