osd-contiki/platform/mb851/dev/acc-sensor.c

/**
 * \addtogroup mb851-platform
 *
 * @{
 */
/*
 * Copyright (c) 2010, STMicroelectronics.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
/**
* \file
*			Accelerometer driver.
* \author
*			Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/

#include "dev/acc-sensor.h"
#include "mems.h"
#include "sys/clock.h"

#define FALSE 0
#define TRUE  1
/*---------------------------------------------------------------------------*/
static int
active(void)
{
  uint8_t reg;

  if(!i2c_read_reg(KLIS3L02DQ_SLAVE_ADDR, CTRL_REG1, &reg, 1)) {
    return FALSE;
  }

  return (reg & 0x40) ? TRUE : FALSE;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
  int8_t i2c_data = 0;
  uint8_t reg_addr;

  switch (type) {
  case ACC_X_AXIS:
    reg_addr = OUTX_H;
    break;

  case ACC_Y_AXIS:
    reg_addr = OUTY_H;
    break;

  case ACC_Z_AXIS:
    reg_addr = OUTZ_H;
    break;

  default:
    return 0;
  }

  i2c_read_reg(KLIS3L02DQ_SLAVE_ADDR, reg_addr, (uint8_t *) &i2c_data, 1);

  if(mems_get_fullscale() == ACC_HIGH_RANGE) {
    return ((int16_t) i2c_data) * HIGH_RANGE_SENSITIVITY;
  } else {
    return ((int16_t) i2c_data) * LOW_RANGE_SENSITIVITY;
  }
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
  switch (type) {
  case SENSORS_HW_INIT:
    return mems_init();

  case SENSORS_ACTIVE:
    if(value) {
      if(mems_on()) {
        clock_wait(8);
        return 1;
      }
      return 0;
    } else {
      return mems_off();
    }

  case ACC_RANGE:
    return mems_set_fullscale((boolean) value);

  case ACC_HPF:
    if(value < ACC_HPF_DISABLE) {
      return i2c_write_reg(KLIS3L02DQ_SLAVE_ADDR, CTRL_REG2,
                           (1 << 4) | (uint8_t) value);
    } else {
      return i2c_write_reg(KLIS3L02DQ_SLAVE_ADDR, CTRL_REG2, 0x00);
    }
  }
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
  switch (type) {
  case SENSORS_READY:
    return active();
  }
  return 0;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(acc_sensor, ACC_SENSOR, value, configure, status);
/** @} */