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ChibiOS/os/ex/ST/lis3mdl.c

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/*
ChibiOS - Copyright (C) 2016 Rocco Marco Guglielmi
This file is part of ChibiOS.
ChibiOS 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 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/>.
*/
/**
* @file lis3mdl.c
* @brief LIS3MDL MEMS interface module code.
*
* @addtogroup LIS3MDL
* @ingroup EX_ST
* @{
*/
#include "hal.h"
#include "lis3mdl.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
#if (LIS3MDL_USE_I2C) || defined(__DOXYGEN__)
/**
* @brief Reads registers value using I2C.
* @pre The I2C interface must be initialized and the driver started.
*
* @param[in] i2cp pointer to the I2C interface
* @param[in] sad slave address without R bit
* @param[in] reg first sub-register address
* @param[out] rxbuf pointer to an output buffer
* @param[in] n number of consecutive register to read
* @return the operation status.
* @notapi
*/
msg_t lis3mdlI2CReadRegister(I2CDriver *i2cp, lis3mdl_sad_t sad, uint8_t reg,
uint8_t* rxbuf, size_t n) {
uint8_t txbuf = reg;
if(n > 1)
txbuf |= LIS3MDL_SUB_MS;
return i2cMasterTransmitTimeout(i2cp, sad, &txbuf, 1, rxbuf, n,
TIME_INFINITE);
}
/**
* @brief Writes a value into a register using I2C.
* @pre The I2C interface must be initialized and the driver started.
*
* @param[in] i2cp pointer to the I2C interface
* @param[in] sad slave address without R bit
* @param[in] txbuf buffer containing sub-address value in first position
* and values to write
* @param[in] n size of txbuf less one (not considering the first
* element)
* @return the operation status.
* @notapi
*/
msg_t lis3mdlI2CWriteRegister(I2CDriver *i2cp, lis3mdl_sad_t sad, uint8_t* txbuf,
uint8_t n) {
if (n > 1)
(*txbuf) |= LIS3MDL_SUB_MS;
return i2cMasterTransmitTimeout(i2cp, sad, txbuf, n + 1, NULL, 0,
TIME_INFINITE);
}
#endif /* LIS3MDL_USE_I2C */
/*
* Interface implementation.
*/
static size_t get_axes_number(void *ip) {
osalDbgCheck(ip != NULL);
return LIS3MDL_NUMBER_OF_AXES;
}
static msg_t read_raw(void *ip, int32_t axes[LIS3MDL_NUMBER_OF_AXES]) {
int16_t tmp;
uint8_t i, buff[2 * LIS3MDL_NUMBER_OF_AXES];
msg_t msg = MSG_OK;
osalDbgCheck((ip != NULL) && (axes != NULL));
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY),
"read_raw(), invalid state");
#if LIS3MDL_USE_I2C
osalDbgAssert((((LIS3MDLDriver *)ip)->config->i2cp->state == I2C_READY),
"read_raw(), channel not ready");
#if LIS3MDL_SHARED_I2C
i2cAcquireBus(((LIS3MDLDriver *)ip)->config->i2cp);
i2cStart(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->i2ccfg);
#endif /* LIS3MDL_SHARED_I2C */
msg = lis3mdlI2CReadRegister(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->slaveaddress,
LIS3MDL_AD_OUT_X_L, buff, 2 * LIS3MDL_NUMBER_OF_AXES);
#if LIS3MDL_SHARED_I2C
i2cReleaseBus(((LIS3MDLDriver *)ip)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
#endif /* LIS3MDL_USE_I2C */
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++) {
if(msg == MSG_OK) {
tmp = buff[2*i] + (buff[2*i+1] << 8);
axes[i] = (int32_t)tmp;
}
else{
axes[i] = 0;
}
}
return msg;
}
static msg_t read_cooked(void *ip, float axes[]) {
uint32_t i;
int32_t raw[LIS3MDL_NUMBER_OF_AXES];
msg_t msg;
osalDbgCheck((ip != NULL) && (axes != NULL));
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY),
"read_cooked(), invalid state");
msg = read_raw(ip, raw);
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES ; i++){
axes[i] = raw[i] * ((LIS3MDLDriver *)ip)->sensitivity[i];
axes[i] -= ((LIS3MDLDriver *)ip)->bias[i];
}
return msg;
}
static msg_t set_bias(void *ip, float *bp) {
uint32_t i;
osalDbgCheck((ip != NULL) && (bp !=NULL));
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY) ||
(((LIS3MDLDriver *)ip)->state == LIS3MDL_STOP),
"set_bias(), invalid state");
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++) {
((LIS3MDLDriver *)ip)->bias[i] = bp[i];
}
return MSG_OK;
}
static msg_t reset_bias(void *ip) {
uint32_t i;
osalDbgCheck(ip != NULL);
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY) ||
(((LIS3MDLDriver *)ip)->state == LIS3MDL_STOP),
"reset_bias(), invalid state");
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
((LIS3MDLDriver *)ip)->bias[i] = 0;
return MSG_OK;
}
static msg_t set_sensivity(void *ip, float *sp) {
uint32_t i;
osalDbgCheck((ip != NULL) && (sp !=NULL));
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY),
"set_sensivity(), invalid state");
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++) {
((LIS3MDLDriver *)ip)->sensitivity[i] = sp[i];
}
return MSG_OK;
}
static msg_t reset_sensivity(void *ip) {
uint32_t i;
osalDbgCheck(ip != NULL);
osalDbgAssert((((LIS3MDLDriver *)ip)->state == LIS3MDL_READY),
"reset_sensivity(), invalid state");
if(((LIS3MDLDriver *)ip)->config->fullscale == LIS3MDL_FS_4GA)
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
((LIS3MDLDriver *)ip)->sensitivity[i] = LIS3MDL_SENS_4GA;
else if(((LIS3MDLDriver *)ip)->config->fullscale == LIS3MDL_FS_8GA)
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
((LIS3MDLDriver *)ip)->sensitivity[i] = LIS3MDL_SENS_8GA;
else if(((LIS3MDLDriver *)ip)->config->fullscale == LIS3MDL_FS_12GA)
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
((LIS3MDLDriver *)ip)->sensitivity[i] = LIS3MDL_SENS_12GA;
else if(((LIS3MDLDriver *)ip)->config->fullscale == LIS3MDL_FS_16GA)
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
((LIS3MDLDriver *)ip)->sensitivity[i] = LIS3MDL_SENS_16GA;
else {
osalDbgAssert(FALSE, "reset_sensivity(), compass full scale issue");
return MSG_RESET;
}
return MSG_OK;
}
static msg_t set_full_scale(void *ip, lis3mdl_fs_t fs) {
float newfs, scale;
uint8_t i, cr[2];
msg_t msg;
if(fs == LIS3MDL_FS_4GA) {
newfs = LIS3MDL_4GA;
}
else if(fs == LIS3MDL_FS_8GA) {
newfs = LIS3MDL_8GA;
}
else if(fs == LIS3MDL_FS_12GA) {
newfs = LIS3MDL_12GA;
}
else if(fs == LIS3MDL_FS_16GA) {
newfs = LIS3MDL_16GA;
}
else {
return MSG_RESET;
}
if(newfs != ((LIS3MDLDriver *)ip)->fullscale) {
scale = newfs / ((LIS3MDLDriver *)ip)->fullscale;
((LIS3MDLDriver *)ip)->fullscale = newfs;
#if LIS3MDL_SHARED_I2C
i2cAcquireBus(((LIS3MDLDriver *)ip)->config->i2cp);
i2cStart(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->i2ccfg);
#endif /* LIS3MDL_SHARED_I2C */
/* Updating register.*/
msg = lis3mdlI2CReadRegister(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->slaveaddress,
LIS3MDL_AD_CTRL_REG2, &cr[1], 1);
#if LIS3MDL_SHARED_I2C
i2cReleaseBus(((LIS3MDLDriver *)ip)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
if(msg != MSG_OK)
return msg;
cr[0] = LIS3MDL_AD_CTRL_REG2;
cr[1] &= ~(LIS3MDL_CTRL_REG2_FS_MASK);
cr[1] |= fs;
#if LIS3MDL_SHARED_I2C
i2cAcquireBus(((LIS3MDLDriver *)ip)->config->i2cp);
i2cStart(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->i2ccfg);
#endif /* LIS3MDL_SHARED_I2C */
msg = lis3mdlI2CWriteRegister(((LIS3MDLDriver *)ip)->config->i2cp,
((LIS3MDLDriver *)ip)->config->slaveaddress, cr, 1);
#if LIS3MDL_SHARED_I2C
i2cReleaseBus(((LIS3MDLDriver *)ip)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
if(msg != MSG_OK)
return msg;
/* Scaling sensitivity and bias. Re-calibration is suggested anyway. */
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++) {
((LIS3MDLDriver *)ip)->sensitivity[i] *= scale;
((LIS3MDLDriver *)ip)->bias[i] *= scale;
}
}
return msg;
}
static const struct BaseSensorVMT vmt_sensor = {
get_axes_number, read_raw, read_cooked
};
static const struct LIS3MDLCompassVMT vmt_compass = {
get_axes_number, read_raw, read_cooked,
set_bias, reset_bias, set_sensivity, reset_sensivity,
set_full_scale
};
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Initializes an instance.
*
* @param[out] devp pointer to the @p LIS3MDLDriver object
*
* @init
*/
void lis3mdlObjectInit(LIS3MDLDriver *devp) {
uint32_t i;
devp->vmt_sensor = &vmt_sensor;
devp->vmt_compass = &vmt_compass;
devp->config = NULL;
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->bias[i] = 0.0f;
devp->state = LIS3MDL_STOP;
}
/**
* @brief Configures and activates LIS3MDL Complex Driver peripheral.
*
* @param[in] devp pointer to the @p LIS3MDLDriver object
* @param[in] config pointer to the @p LIS3MDLConfig object
*
* @api
*/
void lis3mdlStart(LIS3MDLDriver *devp, const LIS3MDLConfig *config) {
uint32_t i;
uint8_t cr[6];
osalDbgCheck((devp != NULL) && (config != NULL));
osalDbgAssert((devp->state == LIS3MDL_STOP) || (devp->state == LIS3MDL_READY),
"lis3mdlStart(), invalid state");
devp->config = config;
/* Control register 1 configuration block.*/
{
cr[0] = LIS3MDL_AD_CTRL_REG1;
cr[1] = devp->config->outputdatarate;
#if LIS3MDL_USE_ADVANCED || defined(__DOXYGEN__)
cr[1] |= devp->config->operationmodexy;
#else
cr[1] |= LIS3MDL_CTRL_REG1_OM0 | LIS3MDL_CTRL_REG1_OM1;
#endif
}
/* Control register 2 configuration block.*/
{
cr[2] = devp->config->fullscale;
}
/* Control register 3 configuration block.*/
{
cr[3] = 0;
#if LIS3MDL_USE_ADVANCED || defined(__DOXYGEN__)
cr[3] = devp->config->conversionmode;
#endif
}
/* Control register 4 configuration block.*/
{
cr[4] = 0;
#if LIS3MDL_USE_ADVANCED || defined(__DOXYGEN__)
cr[4] = devp->config->operationmodez | devp->config->endianness;
#endif
}
/* Control register 5 configuration block.*/
{
cr[5] = 0;
#if LIS3MDL_USE_ADVANCED || defined(__DOXYGEN__)
cr[5] = devp->config->blockdataupdate;
#endif
}
#if LIS3MDL_USE_I2C
#if LIS3MDL_SHARED_I2C
i2cAcquireBus((devp)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
i2cStart((devp)->config->i2cp,
(devp)->config->i2ccfg);
lis3mdlI2CWriteRegister(devp->config->i2cp, devp->config->slaveaddress,
cr, 5);
#if LIS3MDL_SHARED_I2C
i2cReleaseBus((devp)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
#endif /* LIS3MDL_USE_I2C */
if(devp->config->sensitivity == NULL) {
/* Storing sensitivity information according to full scale value */
if(devp->config->fullscale == LIS3MDL_FS_4GA) {
devp->fullscale = LIS3MDL_4GA;
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->sensitivity[i] = LIS3MDL_SENS_4GA;
}
else if(devp->config->fullscale == LIS3MDL_FS_8GA) {
devp->fullscale = LIS3MDL_8GA;
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->sensitivity[i] = LIS3MDL_SENS_8GA;
}
else if(devp->config->fullscale == LIS3MDL_FS_12GA) {
devp->fullscale = LIS3MDL_12GA;
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->sensitivity[i] = LIS3MDL_SENS_12GA;
}
else if(devp->config->fullscale == LIS3MDL_FS_16GA) {
devp->fullscale = LIS3MDL_16GA;
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->sensitivity[i] = LIS3MDL_SENS_16GA;
}
else
osalDbgAssert(FALSE, "lis3mdlStart(), compass full scale issue");
}
else{
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->sensitivity[i] = devp->config->sensitivity[i];
}
if(devp->config->bias == NULL) {
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->bias[i] = 0.0f;
}
else {
for(i = 0; i < LIS3MDL_NUMBER_OF_AXES; i++)
devp->bias[i] = devp->config->bias[i];
}
devp->state = LIS3MDL_READY;
}
/**
* @brief Deactivates the LIS3MDL Complex Driver peripheral.
*
* @param[in] devp pointer to the @p LIS3MDLDriver object
*
* @api
*/
void lis3mdlStop(LIS3MDLDriver *devp) {
uint8_t cr[2];
osalDbgCheck(devp != NULL);
osalDbgAssert((devp->state == LIS3MDL_STOP) || (devp->state == LIS3MDL_READY),
"lis3mdlStop(), invalid state");
if (devp->state == LIS3MDL_READY) {
#if (LIS3MDL_USE_I2C)
#if LIS3MDL_SHARED_I2C
i2cAcquireBus((devp)->config->i2cp);
i2cStart((devp)->config->i2cp,
(devp)->config->i2ccfg);
#endif /* LIS3MDL_SHARED_I2C */
cr[0] = LIS3MDL_AD_CTRL_REG3;
cr[1] = LIS3MDL_CTRL_REG3_MD0 | LIS3MDL_CTRL_REG3_MD1;
lis3mdlI2CWriteRegister(devp->config->i2cp, devp->config->slaveaddress,
cr, 1);
i2cStop((devp)->config->i2cp);
#if LIS3MDL_SHARED_I2C
i2cReleaseBus((devp)->config->i2cp);
#endif /* LIS3MDL_SHARED_I2C */
#endif /* LIS3MDL_USE_I2C */
}
devp->state = LIS3MDL_STOP;
}
/** @} */
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