adc.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file adc.c
* @brief ADC Driver code.
*
* @addtogroup ADC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief ADC Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void adcInit(void) {
adc_lld_init();
}
/**
* @brief Initializes the standard part of a @p ADCDriver structure.
*
* @param[out] adcp pointer to the @p ADCDriver object
*
* @init
*/
void adcObjectInit(ADCDriver *adcp) {
adcp->state = ADC_STOP;
adcp->config = NULL;
adcp->samples = NULL;
adcp->depth = 0;
adcp->grpp = NULL;
#if ADC_USE_WAIT
adcp->thread = NULL;
#endif /* ADC_USE_WAIT */
#if ADC_USE_MUTUAL_EXCLUSION
#if CH_USE_MUTEXES
chMtxInit(&adcp->mutex);
#else
chSemInit(&adcp->semaphore, 1);
#endif
#endif /* ADC_USE_MUTUAL_EXCLUSION */
#if defined(ADC_DRIVER_EXT_INIT_HOOK)
ADC_DRIVER_EXT_INIT_HOOK(adcp);
#endif
}
/**
* @brief Configures and activates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] config pointer to the @p ADCConfig object. Depending on
* the implementation the value can be @p NULL.
*
* @api
*/
void adcStart(ADCDriver *adcp, const ADCConfig *config) {
chDbgCheck(adcp != NULL, "adcStart");
chSysLock();
chDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
"adcStart(), #1", "invalid state");
adcp->config = config;
adc_lld_start(adcp);
adcp->state = ADC_READY;
chSysUnlock();
}
/**
* @brief Deactivates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @api
*/
void adcStop(ADCDriver *adcp) {
chDbgCheck(adcp != NULL, "adcStop");
chSysLock();
chDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
"adcStop(), #1", "invalid state");
adc_lld_stop(adcp);
adcp->state = ADC_STOP;
chSysUnlock();
}
/**
* @brief Starts an ADC conversion.
* @details Starts an asynchronous conversion operation.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @api
*/
void adcStartConversion(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth) {
chSysLock();
adcStartConversionI(adcp, grpp, samples, depth);
chSysUnlock();
}
/**
* @brief Starts an ADC conversion.
* @details Starts an asynchronous conversion operation.
* @post The callbacks associated to the conversion group will be invoked
* on buffer fill and error events.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @iclass
*/
void adcStartConversionI(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth) {
chDbgCheckClassI();
chDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
((depth == 1) || ((depth & 1) == 0)),
"adcStartConversionI");
chDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_COMPLETE) ||
(adcp->state == ADC_ERROR),
"adcStartConversionI(), #1", "not ready");
adcp->samples = samples;
adcp->depth = depth;
adcp->grpp = grpp;
adcp->state = ADC_ACTIVE;
adc_lld_start_conversion(adcp);
}
/**
* @brief Stops an ongoing conversion.
* @details This function stops the currently ongoing conversion and returns
* the driver in the @p ADC_READY state. If there was no conversion
* being processed then the function does nothing.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @api
*/
void adcStopConversion(ADCDriver *adcp) {
chDbgCheck(adcp != NULL, "adcStopConversion");
chSysLock();
chDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_ACTIVE),
"adcStopConversion(), #1", "invalid state");
if (adcp->state != ADC_READY) {
adc_lld_stop_conversion(adcp);
adcp->grpp = NULL;
adcp->state = ADC_READY;
_adc_reset_s(adcp);
}
chSysUnlock();
}
/**
* @brief Stops an ongoing conversion.
* @details This function stops the currently ongoing conversion and returns
* the driver in the @p ADC_READY state. If there was no conversion
* being processed then the function does nothing.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @iclass
*/
void adcStopConversionI(ADCDriver *adcp) {
chDbgCheckClassI();
chDbgCheck(adcp != NULL, "adcStopConversionI");
chDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_ACTIVE) ||
(adcp->state == ADC_COMPLETE),
"adcStopConversionI(), #1", "invalid state");
if (adcp->state != ADC_READY) {
adc_lld_stop_conversion(adcp);
adcp->grpp = NULL;
adcp->state = ADC_READY;
_adc_reset_i(adcp);
}
}
#if ADC_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Performs an ADC conversion.
* @details Performs a synchronous conversion operation.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
* @return The operation result.
* @retval RDY_OK Conversion finished.
* @retval RDY_RESET The conversion has been stopped using
* @p acdStopConversion() or @p acdStopConversionI(),
* the result buffer may contain incorrect data.
* @retval RDY_TIMEOUT The conversion has been stopped because an hardware
* error.
*
* @api
*/
msg_t adcConvert(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth) {
msg_t msg;
chSysLock();
chDbgAssert(adcp->thread == NULL, "adcConvert(), #1", "already waiting");
adcStartConversionI(adcp, grpp, samples, depth);
(adcp)->thread = chThdSelf();
chSchGoSleepS(THD_STATE_SUSPENDED);
msg = chThdSelf()->p_u.rdymsg;
chSysUnlock();
return msg;
}
#endif /* ADC_USE_WAIT */
#if ADC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
/**
* @brief Gains exclusive access to the ADC peripheral.
* @details This function tries to gain ownership to the ADC bus, if the bus
* is already being used then the invoking thread is queued.
* @pre In order to use this function the option
* @p ADC_USE_MUTUAL_EXCLUSION must be enabled.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @api
*/
void adcAcquireBus(ADCDriver *adcp) {
chDbgCheck(adcp != NULL, "adcAcquireBus");
#if CH_USE_MUTEXES
chMtxLock(&adcp->mutex);
#elif CH_USE_SEMAPHORES
chSemWait(&adcp->semaphore);
#endif
}
/**
* @brief Releases exclusive access to the ADC peripheral.
* @pre In order to use this function the option
* @p ADC_USE_MUTUAL_EXCLUSION must be enabled.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @api
*/
void adcReleaseBus(ADCDriver *adcp) {
chDbgCheck(adcp != NULL, "adcReleaseBus");
#if CH_USE_MUTEXES
(void)adcp;
chMtxUnlock();
#elif CH_USE_SEMAPHORES
chSemSignal(&adcp->semaphore);
#endif
}
#endif /* ADC_USE_MUTUAL_EXCLUSION */
#endif /* HAL_USE_ADC */
/** @} */