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

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2010-10-25 09:03:38 +00:00
/*
* 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.
*
* This file is part of the Contiki OS
*
* $Id: acc-sensor.c,v 1.1 2010/10/25 09:03:39 salvopitru Exp $
*/
/*---------------------------------------------------------------------------*/
/**
* \file
* Accelerometer.
* \author
* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/
/*---------------------------------------------------------------------------*/
#include "dev/acc-sensor.h"
#include "mems.h"
void clock_wait(int i);
#define FALSE 0
#define TRUE 1
/*---------------------------------------------------------------------------*/
static int
active(void)
{
int8u reg;
if(!i2c_read_reg (kLIS3L02DQ_SLAVE_ADDR,CTRL_REG1, &reg, 1))
return FALSE;
return (reg & 0x40) ? TRUE : FALSE ;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
int8s i2c_data = 0;
int8u 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, (int8u *)&i2c_data, 1);
if(MEMS_GetFullScale()==ACC_HIGH_RANGE){
return ((int16s)i2c_data)*HIGH_RANGE_SENSITIVITY;
}
else {
return ((int16s)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_SetFullScale((boolean)value);
case ACC_HPF:
if(value < ACC_HPF_DISABLE){
return i2c_write_reg(kLIS3L02DQ_SLAVE_ADDR, CTRL_REG2, (1<<4) | (int8u)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);