adxl345: Grove 3-Axis Accelerometer

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/adxl345/adxl345.h

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+/*
+ * Author: Mihai Tudor Panu <mihai.tudor.panu@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 <mraa/i2c.h>
+
+#define READ_BUFFER_LENGTH 6
+
+namespace upm {
+
+/**
+ * @brief Adxl345 accelerometer library
+ * @defgroup adxl345 libupm-adxl345
+ */
+
+/**
+ * @brief C++ API for Adxl345 (3-axis digital accelerometer)
+ *
+ * The Adxl345 is a 3-axis digital accelerometer.
+ * (http://www.seeedstudio.com/wiki/images/2/2c/ADXL345_datasheet.pdf)
+ * The sensor has configurable resolutions for measuring ±2g, ±4g, ±8g or ±16g.
+ * Note that the sensor it is incompatible and will not be detected on the I2C bus
+ * by the Intel Edison using the Arduino breakout board at 5V (3V3 will work fine).
+ *
+ * @ingroup adxl345 i2c
+ * @snippet adxl345.cxx Interesting
+ * @image html adxl345.jpeg
+ */
+class Adxl345 {
+public:
+    /**
+     * Creates an Adxl345 object
+     *
+     * @param bus number of used i2c bus
+     */
+    Adxl345(int bus);
+
+    /**
+     * Adxl345 object destructor
+     */
+    ~Adxl345();
+
+    /**
+     * Returns a pointer to a float[3] that contains acceleration (g) forces
+     *
+     * @return float* to a float[3]
+     */
+    float* getAcceleration();
+
+    /**
+     * Returns a pointer to an int[3] that contains the raw register values for X, Y and Z
+     *
+     * @return int* to an int[3]
+     */
+    int16_t* getRawValues();
+
+    /**
+     * Returns the scale the accelerometer is currently set up to: 2, 4, 8 or 16
+     *
+     * @return uint with current scale value
+     */
+    uint8_t getScale();
+
+    /**
+     * Updates the acceleration values from i2c bus
+     *
+     * @return 0 for success
+     */
+    mraa_result_t update();
+private:
+    float m_accel[3];
+    float m_offsets[3];
+    int16_t m_rawaccel[3];
+    uint8_t m_buffer[READ_BUFFER_LENGTH];
+    mraa_i2c_context m_i2c;
+};
+
+}