/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_adc.c
* @brief ADC Driver code.
*
* @addtogroup ADC
* @{
*/
#include "hal.h"
#if (HAL_USE_ADC == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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 == TRUE
adcp->thread = NULL;
#endif
#if ADC_USE_MUTUAL_EXCLUSION == TRUE
osalMutexObjectInit(&adcp->mutex);
#endif
#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) {
osalDbgCheck(adcp != NULL);
osalSysLock();
osalDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
"invalid state");
adcp->config = config;
adc_lld_start(adcp);
adcp->state = ADC_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @api
*/
void adcStop(ADCDriver *adcp) {
osalDbgCheck(adcp != NULL);
osalSysLock();
osalDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
"invalid state");
adc_lld_stop(adcp);
adcp->config = NULL;
adcp->state = ADC_STOP;
osalSysUnlock();
}
/**
* @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) {
osalSysLock();
adcStartConversionI(adcp, grpp, samples, depth);
osalSysUnlock();
}
/**
* @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) {
osalDbgCheckClassI();
osalDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
(depth > 0U) && ((depth == 1U) || ((depth & 1U) == 0U)));
osalDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_COMPLETE) ||
(adcp->state == ADC_ERROR),
"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) {
osalDbgCheck(adcp != NULL);
osalSysLock();
osalDbgAssert((adcp->state == ADC_READY) || (adcp->state == ADC_ACTIVE),
"invalid state");
if (adcp->state != ADC_READY) {
adc_lld_stop_conversion(adcp);
adcp->grpp = NULL;
adcp->state = ADC_READY;
_adc_reset_s(adcp);
}
osalSysUnlock();
}
/**
* @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) {
osalDbgCheckClassI();
osalDbgCheck(adcp != NULL);
osalDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_ACTIVE) ||
(adcp->state == ADC_COMPLETE),
"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 == TRUE) || 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 MSG_OK Conversion finished.
* @retval MSG_RESET The conversion has been stopped using
* @p acdStopConversion() or @p acdStopConversionI(),
* the result buffer may contain incorrect data.
* @retval MSG_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;
osalSysLock();
osalDbgAssert(adcp->thread == NULL, "already waiting");
adcStartConversionI(adcp, grpp, samples, depth);
msg = osalThreadSuspendS(&adcp->thread);
osalSysUnlock();
return msg;
}
#endif /* ADC_USE_WAIT == TRUE */
#if (ADC_USE_MUTUAL_EXCLUSION == TRUE) || 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) {
osalDbgCheck(adcp != NULL);
osalMutexLock(&adcp->mutex);
}
/**
* @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) {
osalDbgCheck(adcp != NULL);
osalMutexUnlock(&adcp->mutex);
}
#endif /* ADC_USE_MUTUAL_EXCLUSION == TRUE */
#endif /* HAL_USE_ADC == TRUE */
/** @} */
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