Added ahal
This is a formatted copy of WPILib's default user-visible C++ API, with
a bit of completely unnecessary functionality stripped out. Most of the
stripping so far is only related to weird threading decisions.
Change-Id: Icbfd949b48cd115561862cb909bcc572aba0e753
diff --git a/frc971/wpilib/ahal/Relay.h b/frc971/wpilib/ahal/Relay.h
new file mode 100644
index 0000000..ecdd8af
--- /dev/null
+++ b/frc971/wpilib/ahal/Relay.h
@@ -0,0 +1,49 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2008-2017. All Rights Reserved. */
+/* Open Source Software - may be 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 "HAL/Types.h"
+#include "frc971/wpilib/ahal/SensorBase.h"
+
+namespace frc {
+
+/**
+ * Class for Spike style relay outputs.
+ * Relays are intended to be connected to spikes or similar relays. The relay
+ * channels controls a pair of pins that are either both off, one on, the other
+ * on, or both on. This translates into two spike outputs at 0v, one at 12v and
+ * one at 0v, one at 0v and the other at 12v, or two spike outputs at 12V. This
+ * allows off, full forward, or full reverse control of motors without variable
+ * speed. It also allows the two channels (forward and reverse) to be used
+ * independently for something that does not care about voltage polarity (like
+ * a solenoid).
+ */
+class Relay {
+ public:
+ enum Value { kOff, kOn, kForward, kReverse };
+ enum Direction { kBothDirections, kForwardOnly, kReverseOnly };
+
+ explicit Relay(int channel, Direction direction = kBothDirections);
+ virtual ~Relay();
+
+ void Set(Value value);
+ Value Get() const;
+ int GetChannel() const;
+
+ private:
+ int m_channel;
+ Direction m_direction;
+
+ HAL_RelayHandle m_forwardHandle = HAL_kInvalidHandle;
+ HAL_RelayHandle m_reverseHandle = HAL_kInvalidHandle;
+};
+
+} // namespace frc