adxl335.h

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * Adapted from the seeedstudio example
 * https://github.com/Seeed-Studio/Accelerometer_ADXL335
 *
 * 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/aio.h>

#define ADXL335_DEFAULT_AREF 5.0
#define ADXL335_SENSITIVITY 0.25 // 0.25v/g

namespace upm {

  class ADXL335 {
  public:
    ADXL335(int pinX, int pinY, int pinZ, float aref=ADXL335_DEFAULT_AREF);

    ~ADXL335();

    void setZeroX(float zeroX) { m_zeroX = zeroX; };

    void setZeroY(float zeroY) { m_zeroY = zeroY; };

    void setZeroZ(float zeroZ) { m_zeroZ = zeroZ; };

    void values(int *xVal, int *yVal, int *zVal);

    void acceleration(float *xAccel, float *yAccel, float *zAccel);

    void calibrate();

  private:
    mraa_aio_context m_aioX;
    mraa_aio_context m_aioY;
    mraa_aio_context m_aioZ;
    float m_aref;
    float m_zeroX, m_zeroY, m_zeroZ;
  };
}