205 lines
6.4 KiB
C
205 lines
6.4 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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/RT 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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* @addtogroup ADC
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* @{
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*/
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#include <ch.h>
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#include <adc.h>
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/**
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* @brief ADC Driver initialization.
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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[in] adcp pointer to the @p ADCDriver object
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*/
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void adcObjectInit(ADCDriver *adcp) {
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adcp->ad_state = ADC_STOP;
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adcp->ad_config = NULL;
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adcp->ad_callback = NULL;
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adcp->ad_samples = NULL;
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adcp->ad_depth = 0;
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adcp->ad_grpp = NULL;
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chSemInit(&adcp->ad_sem, 0);
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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
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*/
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void adcStart(ADCDriver *adcp, const ADCConfig *config) {
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chDbgCheck((adcp != NULL) && (config != NULL), "adcStart");
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chSysLock();
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chDbgAssert((adcp->ad_state == ADC_STOP) || (adcp->ad_state == ADC_READY),
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"adcStart(), #1",
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"invalid state");
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adcp->ad_config = config;
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adc_lld_start(adcp);
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adcp->ad_state = ADC_READY;
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chSysUnlock();
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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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void adcStop(ADCDriver *adcp) {
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chDbgCheck(adcp != NULL, "adcStop");
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chSysLock();
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chDbgAssert((adcp->ad_state == ADC_STOP) || (adcp->ad_state == ADC_READY),
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"adcStop(), #1",
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"invalid state");
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adc_lld_stop(adcp);
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adcp->ad_state = ADC_STOP;
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chSysUnlock();
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}
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/**
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* @brief Starts an ADC conversion.
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* @details Starts a conversion operation, there are two kind of conversion
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* modes:
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* - <b>LINEAR</b>, this mode is activated when the @p callback
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* parameter is set to @p NULL, in this mode the buffer is filled
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* once and then the conversion stops automatically.
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* - <b>CIRCULAR</b>, when a callback function is defined the
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* conversion never stops and the buffer is filled circularly.
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* During the conversion the callback function is invoked when
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* the buffer is 50% filled and when the buffer is 100% filled,
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* this way is possible to process the conversion stream in real
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* time. This kind of conversion can only be stopped by explicitly
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* invoking @p adcStopConversion().
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* .
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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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* @param[in] callback pointer to the conversion callback function
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* @return The operation status.
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* @retval FALSE the conversion has been started.
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* @retval TRUE the driver is busy, conversion not started.
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*
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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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bool_t 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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adccallback_t callback) {
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chDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
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((depth == 1) || ((depth & 1) == 0)),
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"adcStartConversion");
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chSysLock();
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chDbgAssert((adcp->ad_state == ADC_READY) ||
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(adcp->ad_state == ADC_RUNNING),
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"adcStartConversion(), #1",
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"invalid state");
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if (adcp->ad_state == ADC_RUNNING) {
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chSysUnlock();
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return TRUE;
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}
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adcp->ad_callback = callback;
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adcp->ad_samples = samples;
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adcp->ad_depth = depth;
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adcp->ad_grpp = grpp;
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adc_lld_start_conversion(adcp);
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adcp->ad_state = ADC_RUNNING;
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chSysUnlock();
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return FALSE;
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}
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/**
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* @brief Stops an ongoing conversion.
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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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void adcStopConversion(ADCDriver *adcp) {
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chDbgCheck(adcp != NULL, "adcStopConversion");
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chSysLock();
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chDbgAssert((adcp->ad_state == ADC_READY) ||
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(adcp->ad_state == ADC_RUNNING),
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"adcStopConversion(), #1",
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"invalid state");
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if (adcp->ad_state == ADC_RUNNING) {
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adc_lld_stop_conversion(adcp);
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adcp->ad_grpp = NULL;
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adcp->ad_state = ADC_READY;
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}
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chSysUnlock();
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}
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/**
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* @brief Waits for completion.
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*
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* @param[in] adcp pointer to the @p ADCDriver object
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* @param[in] timeout the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The operation result.
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* @retval RDY_OK conversion finished (or not started).
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* @retval RDY_TIMEOUT conversion not finished within the specified time.
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*/
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msg_t adcWaitConversion(ADCDriver *adcp, systime_t timeout) {
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chSysLock();
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chDbgAssert((adcp->ad_state == ADC_READY) ||
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(adcp->ad_state == ADC_RUNNING),
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"adcWaitConversion(), #1",
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"invalid state");
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if (adcp->ad_state == ADC_RUNNING) {
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if (chSemWaitTimeoutS(&adcp->ad_sem, timeout) == RDY_TIMEOUT) {
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chSysUnlock();
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return RDY_TIMEOUT;
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}
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}
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chSysUnlock();
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return RDY_OK;
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}
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/** @} */
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