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