joystick12: Add Elecfreaks Joystic 1.2/1.4 support

This should also support similar analog joysticks

Signed-off-by: izard <alexander.komarov@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

src/joystick12/joystick12.h

@@ -0,0 +1,82 @@
+/*
+ * Author: Alexander Komarov <alexander.komarov@intel.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+#include <string>
+#include <mraa/gpio.h>
+#include <mraa/aio.h>
+
+namespace upm {
+
+/**
+ * @brief C++ API for Elecfreaks Joystick v 1.2-1.4 breakout
+ *
+ * This file defines the Joystick API and implemntation for X, Y
+ * button could be treated as normal GPIO, this enables easier
+ * interrupt support
+ *
+ * @snippet joystick12-example.cxx Interesting
+ *
+ */
+class Joystick12 {
+    public:
+        /**
+         * Instantiates a Joystick object
+         *
+         * @param pinX analog pin where X input is connected
+         * @param pinY analog pin where Y input is connected
+         */
+        Joystick12(int pinX, int pinY);
+
+        /**
+         * Joystick object destructor
+         */
+        ~Joystick12();
+
+        /**
+         * Get X input
+         * @return float X value, range from -1 to 1. 0 is mid
+         */
+        float getXInput();
+
+        /**
+         * Get Y input
+         *
+         * @return float Y value, range from -1 to 1. 0 is mid
+         */
+        float getYInput();
+
+    private:
+        mraa_aio_context    m_joystickCtxX;
+        mraa_aio_context    m_joystickCtxY;
+
+        static const int X_left;
+        static const int X_center;
+        static const int X_right;
+        static const int Y_left;
+        static const int Y_center;
+        static const int Y_right;
+};
+};
+