Initial hood implementation.

- Zeroing works, control loop converges.

Change-Id: Icf28f17f7623dbe565379ae14c56e699c2631a8e
diff --git a/y2017/control_loops/superstructure/hood/hood.h b/y2017/control_loops/superstructure/hood/hood.h
new file mode 100644
index 0000000..b96d384
--- /dev/null
+++ b/y2017/control_loops/superstructure/hood/hood.h
@@ -0,0 +1,50 @@
+#ifndef Y2017_CONTROL_LOOPS_SUPERSTRUCTURE_HOOD_HOOD_H_
+#define Y2017_CONTROL_LOOPS_SUPERSTRUCTURE_HOOD_HOOD_H_
+
+#include "frc971/control_loops/profiled_subsystem.h"
+#include "y2017/control_loops/superstructure/superstructure.q.h"
+
+namespace y2017 {
+namespace control_loops {
+namespace superstructure {
+namespace hood {
+
+class Hood {
+ public:
+   Hood();
+   double goal(int row, int col) const {
+     return profiled_subsystem_.goal(row, col);
+   }
+
+   // The zeroing and operating voltages.
+   static constexpr double kZeroingVoltage = 2.5;
+   static constexpr double kOperatingVoltage = 12.0;
+
+   void Iterate(const control_loops::HoodGoal *unsafe_goal,
+                const ::frc971::PotAndIndexPosition *position, double *output,
+                ::frc971::control_loops::ProfiledJointStatus *status);
+
+   void Reset();
+
+   enum class State : int32_t{
+     UNINITIALIZED,
+     DISABLED_INITIALIZED,
+     ZEROING,
+     RUNNING,
+     ESTOP,
+   };
+
+   State state() const { return state_; }
+
+  private:
+   State state_;
+
+   ::frc971::control_loops::SingleDOFProfiledSubsystem<> profiled_subsystem_;
+};
+
+}  // namespace hood
+}  // namespace superstructure
+}  // namespace control_loops
+}  // namespace y2017
+
+#endif  // Y2017_CONTROL_LOOPS_SUPERSTRUCTURE_HOOD_HOOD_H_