325 lines
10 KiB
C
325 lines
10 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file adc.c
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* @brief ADC Driver code.
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*
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* @addtogroup ADC
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_ADC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief ADC Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void adcInit(void) {
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adc_lld_init();
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}
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/**
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* @brief Initializes the standard part of a @p ADCDriver structure.
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*
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* @param[out] adcp pointer to the @p ADCDriver object
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*
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* @init
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*/
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void adcObjectInit(ADCDriver *adcp) {
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adcp->state = ADC_STOP;
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adcp->config = NULL;
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adcp->samples = NULL;
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adcp->depth = 0;
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adcp->grpp = NULL;
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#if ADC_USE_WAIT
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adcp->thread = NULL;
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#endif /* ADC_USE_WAIT */
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#if ADC_USE_MUTUAL_EXCLUSION
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osalMutexObjectInit(&adcp->mutex);
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#endif /* ADC_USE_MUTUAL_EXCLUSION */
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#if defined(ADC_DRIVER_EXT_INIT_HOOK)
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ADC_DRIVER_EXT_INIT_HOOK(adcp);
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#endif
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}
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/**
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* @brief Configures and activates the ADC peripheral.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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* @param[in] config pointer to the @p ADCConfig object. Depending on
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* the implementation the value can be @p NULL.
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*
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* @api
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*/
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void adcStart(ADCDriver *adcp, const ADCConfig *config) {
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osalDbgCheck(adcp != NULL);
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osalSysLock();
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osalDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
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"invalid state");
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adcp->config = config;
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adc_lld_start(adcp);
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adcp->state = ADC_READY;
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osalSysUnlock();
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}
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/**
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* @brief Deactivates the ADC peripheral.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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*
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* @api
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*/
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void adcStop(ADCDriver *adcp) {
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osalDbgCheck(adcp != NULL);
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osalSysLock();
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osalDbgAssert((adcp->state == ADC_STOP) || (adcp->state == ADC_READY),
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"invalid state");
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adc_lld_stop(adcp);
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adcp->state = ADC_STOP;
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osalSysUnlock();
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}
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/**
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* @brief Starts an ADC conversion.
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* @details Starts an asynchronous conversion operation.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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* @param[in] grpp pointer to a @p ADCConversionGroup object
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* @param[out] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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*
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* @api
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*/
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void adcStartConversion(ADCDriver *adcp,
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const ADCConversionGroup *grpp,
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adcsample_t *samples,
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size_t depth) {
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osalSysLock();
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adcStartConversionI(adcp, grpp, samples, depth);
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osalSysUnlock();
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}
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/**
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* @brief Starts an ADC conversion.
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* @details Starts an asynchronous conversion operation.
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* @post The callbacks associated to the conversion group will be invoked
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* on buffer fill and error events.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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* @param[in] grpp pointer to a @p ADCConversionGroup object
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* @param[out] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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*
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* @iclass
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*/
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void adcStartConversionI(ADCDriver *adcp,
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const ADCConversionGroup *grpp,
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adcsample_t *samples,
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size_t depth) {
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osalDbgCheckClassI();
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osalDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
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((depth == 1) || ((depth & 1) == 0)));
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osalDbgAssert((adcp->state == ADC_READY) ||
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(adcp->state == ADC_COMPLETE) ||
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(adcp->state == ADC_ERROR),
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"not ready");
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adcp->samples = samples;
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adcp->depth = depth;
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adcp->grpp = grpp;
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adcp->state = ADC_ACTIVE;
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adc_lld_start_conversion(adcp);
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}
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/**
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* @brief Stops an ongoing conversion.
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* @details This function stops the currently ongoing conversion and returns
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* the driver in the @p ADC_READY state. If there was no conversion
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* being processed then the function does nothing.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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*
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* @api
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*/
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void adcStopConversion(ADCDriver *adcp) {
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osalDbgCheck(adcp != NULL);
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osalSysLock();
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osalDbgAssert((adcp->state == ADC_READY) || (adcp->state == ADC_ACTIVE),
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"invalid state");
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if (adcp->state != ADC_READY) {
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adc_lld_stop_conversion(adcp);
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adcp->grpp = NULL;
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adcp->state = ADC_READY;
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_adc_reset_s(adcp);
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}
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osalSysUnlock();
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}
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/**
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* @brief Stops an ongoing conversion.
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* @details This function stops the currently ongoing conversion and returns
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* the driver in the @p ADC_READY state. If there was no conversion
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* being processed then the function does nothing.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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*
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* @iclass
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*/
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void adcStopConversionI(ADCDriver *adcp) {
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osalDbgCheckClassI();
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osalDbgCheck(adcp != NULL);
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osalDbgAssert((adcp->state == ADC_READY) ||
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(adcp->state == ADC_ACTIVE) ||
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(adcp->state == ADC_COMPLETE),
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"invalid state");
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if (adcp->state != ADC_READY) {
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adc_lld_stop_conversion(adcp);
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adcp->grpp = NULL;
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adcp->state = ADC_READY;
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_adc_reset_i(adcp);
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}
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}
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#if ADC_USE_WAIT || defined(__DOXYGEN__)
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/**
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* @brief Performs an ADC conversion.
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* @details Performs a synchronous conversion operation.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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* @param[in] grpp pointer to a @p ADCConversionGroup object
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* @param[out] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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* @return The operation result.
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* @retval RDY_OK Conversion finished.
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* @retval RDY_RESET The conversion has been stopped using
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* @p acdStopConversion() or @p acdStopConversionI(),
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* the result buffer may contain incorrect data.
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* @retval RDY_TIMEOUT The conversion has been stopped because an hardware
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* error.
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*
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* @api
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*/
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msg_t adcConvert(ADCDriver *adcp,
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const ADCConversionGroup *grpp,
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adcsample_t *samples,
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size_t depth) {
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msg_t msg;
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osalSysLock();
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osalDbgAssert(adcp->thread == NULL, "already waiting");
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adcStartConversionI(adcp, grpp, samples, depth);
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msg = osalThreadSuspendS(&adcp->thread);
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osalSysUnlock();
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return msg;
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}
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#endif /* ADC_USE_WAIT */
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#if ADC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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/**
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* @brief Gains exclusive access to the ADC peripheral.
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* @details This function tries to gain ownership to the ADC bus, if the bus
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* is already being used then the invoking thread is queued.
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* @pre In order to use this function the option
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* @p ADC_USE_MUTUAL_EXCLUSION must be enabled.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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*
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* @api
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*/
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void adcAcquireBus(ADCDriver *adcp) {
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osalDbgCheck(adcp != NULL);
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osalMutexLock(&adcp->mutex);
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}
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/**
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* @brief Releases exclusive access to the ADC peripheral.
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* @pre In order to use this function the option
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* @p ADC_USE_MUTUAL_EXCLUSION must be enabled.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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*
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* @api
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*/
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void adcReleaseBus(ADCDriver *adcp) {
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osalDbgCheck(adcp != NULL);
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osalMutexUnlock(&adcp->mutex);
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}
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#endif /* ADC_USE_MUTUAL_EXCLUSION */
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#endif /* HAL_USE_ADC */
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/** @} */
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