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/*
* Copyright (C) 2014 PHYTEC Messtechnik GmbH
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*
*/
/**
* @ingroup drivers_mpl3115a2
* @{
*
* @file
* @brief Driver for the Freescale MPL3115A2 Sensor.
*
* @author Johann Fischer <j.fischer@phytec.de>
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
*
* @}
*/
#include <stdint.h>
#include <stdbool.h>
#include "periph/i2c.h"
#include "mpl3115a2.h"
#include "mpl3115a2_reg.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define I2C_SPEED I2C_SPEED_FAST
int mpl3115a2_test(mpl3115a2_t *dev)
{
uint8_t reg;
/* Acquire exclusive access to the bus. */
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_WHO_AM_I, ®, 1) != 1) {
/* Release the bus for other threads. */
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
if (reg != MPL3115A2_ID) {
return -1;
}
return 0;
}
int mpl3115a2_init(mpl3115a2_t *dev, i2c_t i2c, uint8_t address, uint8_t os_ratio)
{
uint8_t reg;
/* write device descriptor */
dev->i2c = i2c;
dev->addr = address;
dev->initialized = false;
if (os_ratio > MPL3115A2_OS_RATIO_128) {
return -1;
}
i2c_acquire(dev->i2c);
/* initialize the I2C bus */
if (i2c_init_master(i2c, I2C_SPEED) < 0) {
i2c_release(dev->i2c);
return -2;
}
i2c_release(dev->i2c);
if (mpl3115a2_test(dev)) {
return -3;
}
reg = MPL3115A2_CTRL_REG1_OS(os_ratio);
i2c_acquire(dev->i2c);
if (i2c_write_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -4;
}
i2c_release(dev->i2c);
reg = MPL3115A2_PT_DATA_CFG_TDEFE
| MPL3115A2_PT_DATA_CFG_PDEFE
| MPL3115A2_PT_DATA_CFG_DREM;
i2c_acquire(dev->i2c);
if (i2c_write_regs(dev->i2c, dev->addr, MPL3115A2_PT_DATA_CFG, ®, 1) != 1) {
i2c_release(dev->i2c);
return -4;
}
i2c_release(dev->i2c);
dev->initialized = true;
return 0;
}
int mpl3115a2_reset(mpl3115a2_t *dev)
{
uint8_t reg;
dev->initialized = false;
reg = MPL3115A2_CTRL_REG1_RST;
i2c_acquire(dev->i2c);
if (i2c_write_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int mpl3115a2_set_active(mpl3115a2_t *dev)
{
uint8_t reg;
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
reg |= MPL3115A2_CTRL_REG1_SBYB;
if (i2c_write_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int mpl3115a2_set_standby(mpl3115a2_t *dev)
{
uint8_t reg;
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
reg &= ~MPL3115A2_CTRL_REG1_SBYB;
if (i2c_write_regs(dev->i2c, dev->addr, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int mpl3115a2_is_ready(mpl3115a2_t *dev)
{
uint8_t reg;
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_STATUS, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return reg & MPL3115A2_STATUS_PTDR;
}
int mpl3115a2_read_pressure(mpl3115a2_t *dev, uint32_t *pres, uint8_t *status)
{
uint8_t buf[4];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_STATUS, buf, 4) != 4) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
*status = buf[0];
*pres = ((uint32_t)buf[1] << 16) | ((uint32_t)buf[2] << 8) | buf[3];
*pres = *pres / 64;
return 0;
}
int mpl3115a2_read_temp(mpl3115a2_t *dev, int16_t *temp)
{
uint8_t buf[2];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, MPL3115A2_OUT_T_MSB, buf, 2) != 2) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
*temp = ((int16_t)(((int16_t)buf[0] << 8) | buf[1]) * 10) / 256;
return 0;
}
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