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 elopes
add first test an...
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/*
* Copyright (C) 2014 PHYTEC Messtechnik GmbH
* 2017 HAW Hamburg
*
* 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>
* @author Sebastian Meiling <s@mlng.net>
*
* @}
*/
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "log.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
#define BUS (dev->params.i2c)
#define ADDR (dev->params.addr)
int mpl3115a2_init(mpl3115a2_t *dev, const mpl3115a2_params_t *params)
{
uint8_t reg;
assert(dev);
assert(params);
/* write device descriptor */
memcpy(dev, params, sizeof(mpl3115a2_params_t));
i2c_acquire(BUS);
/* initialize the I2C bus */
if (i2c_init_master(BUS, I2C_SPEED) < 0) {
i2c_release(BUS);
LOG_ERROR("mpl3115a2_init: failed to init I2C!\n");
return -MPL3115A2_ERROR_I2C;
}
/* test device */
if (i2c_read_regs(BUS, ADDR, MPL3115A2_WHO_AM_I, ®, 1) != 1) {
/* Release the bus for other threads. */
i2c_release(BUS);
LOG_ERROR("mpl3115a2_init: I2C error!\n");
return -MPL3115A2_ERROR_I2C;
}
if (reg != MPL3115A2_ID) {
LOG_ERROR("mpl3115a2_init: invalid WHO_AM_I value (0x%02x)!\n", (int)reg);
return -MPL3115A2_ERROR_DEV;
}
/* set sample rate */
reg = MPL3115A2_CTRL_REG1_OS(dev->params.ratio);
if (i2c_write_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
LOG_ERROR("mpl3115a2_init: failed to set sample rate!\n");
return -MPL3115A2_ERROR_CNF;
}
/* configure device */
reg = MPL3115A2_PT_DATA_CFG_TDEFE |
MPL3115A2_PT_DATA_CFG_PDEFE |
MPL3115A2_PT_DATA_CFG_DREM;
if (i2c_write_regs(BUS, ADDR, MPL3115A2_PT_DATA_CFG, ®, 1) != 1) {
i2c_release(BUS);
LOG_ERROR("mpl3115a2_init: config failure!\n");
return -MPL3115A2_ERROR_CNF;
}
i2c_release(BUS);
return MPL3115A2_OK;
}
int mpl3115a2_reset(const mpl3115a2_t *dev)
{
uint8_t reg;
i2c_acquire(BUS);
reg = MPL3115A2_CTRL_REG1_RST;
if (i2c_write_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
LOG_ERROR("mpl3115a2_reset: failed!\n");
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
return MPL3115A2_OK;
}
int mpl3115a2_set_active(const mpl3115a2_t *dev)
{
uint8_t reg;
i2c_acquire(BUS);
if (i2c_read_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
reg |= MPL3115A2_CTRL_REG1_SBYB;
if (i2c_write_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
return MPL3115A2_OK;
}
int mpl3115a2_set_standby(const mpl3115a2_t *dev)
{
uint8_t reg;
i2c_acquire(BUS);
if (i2c_read_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
reg &= ~MPL3115A2_CTRL_REG1_SBYB;
if (i2c_write_regs(BUS, ADDR, MPL3115A2_CTRL_REG1, ®, 1) != 1) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
return MPL3115A2_OK;
}
int mpl3115a2_is_ready(const mpl3115a2_t *dev)
{
uint8_t reg;
i2c_acquire(BUS);
if (i2c_read_regs(BUS, ADDR, MPL3115A2_STATUS, ®, 1) != 1) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
return reg & MPL3115A2_STATUS_PTDR;
}
int mpl3115a2_read_pressure(const mpl3115a2_t *dev, uint32_t *pres, uint8_t *status)
{
uint8_t buf[4];
i2c_acquire(BUS);
if (i2c_read_regs(BUS, ADDR, MPL3115A2_STATUS, buf, 4) != 4) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
*status = buf[0];
*pres = ((uint32_t)buf[1] << 16) | ((uint32_t)buf[2] << 8) | buf[3];
*pres = *pres / 64;
return MPL3115A2_OK;
}
int mpl3115a2_read_temp(const mpl3115a2_t *dev, int16_t *temp)
{
uint8_t buf[2];
i2c_acquire(BUS);
if (i2c_read_regs(BUS, ADDR, MPL3115A2_OUT_T_MSB, buf, 2) != 2) {
i2c_release(BUS);
return -MPL3115A2_ERROR_I2C;
}
i2c_release(BUS);
*temp = ((int16_t)(((int16_t)buf[0] << 8) | buf[1]) * 10) / 256;
return MPL3115A2_OK;
}
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