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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* This is device realize "read through write" paradigm. This is not
* standard, but most of I2C devices use this paradigm.
* You must write to device reading address, send restart to bus,
* and then begin reading process.
*/
#include <stdlib.h>
#include "ch.h"
#include "hal.h"
#include "lis3.h"
#define lis3_addr 0b0011101
/* buffers */
static uint8_t accel_rx_data[ACCEL_RX_DEPTH];
static uint8_t accel_tx_data[ACCEL_TX_DEPTH];
static i2cflags_t errors = 0;
static int16_t acceleration_x = 0;
static int16_t acceleration_y = 0;
static int16_t acceleration_z = 0;
/**
* Init function. Here we will also start personal serving thread.
*/
int init_lis3(void){
msg_t status = RDY_OK;
systime_t tmo = MS2ST(4);
/* configure accelerometer */
accel_tx_data[0] = ACCEL_CTRL_REG1 | AUTO_INCREMENT_BIT; /* register address */
accel_tx_data[1] = 0b11100111;
accel_tx_data[2] = 0b01000001;
accel_tx_data[3] = 0b00000000;
/* sending */
i2cAcquireBus(&I2CD1);
status = i2cMasterTransmitTimeout(&I2CD1, lis3_addr, accel_tx_data, 4, accel_rx_data, 0, tmo);
i2cReleaseBus(&I2CD1);
if (status != RDY_OK){
errors = i2cGetErrors(&I2CD1);
}
return 0;
}
/**
*
*/
void request_acceleration_data(void){
msg_t status = RDY_OK;
systime_t tmo = MS2ST(4);
accel_tx_data[0] = ACCEL_OUT_DATA | AUTO_INCREMENT_BIT; /* register address */
i2cAcquireBus(&I2CD1);
status = i2cMasterTransmitTimeout(&I2CD1, lis3_addr, accel_tx_data, 1, accel_rx_data, 6, tmo);
i2cReleaseBus(&I2CD1);
if (status != RDY_OK){
errors = i2cGetErrors(&I2CD1);
}
acceleration_x = accel_rx_data[0] + (accel_rx_data[1] << 8);
acceleration_y = accel_rx_data[2] + (accel_rx_data[3] << 8);
acceleration_z = accel_rx_data[4] + (accel_rx_data[5] << 8);
}
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