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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 STM32/adc_lld.c
* @brief STM32 ADC subsystem low level driver source
* @addtogroup STM32_ADC
* @{
*/
#include <ch.h>
#include <adc.h>
#include <stm32_dma.h>
#include <nvic.h>
#if USE_STM32_ADC1 || defined(__DOXYGEN__)
/** @brief ADC1 driver identifier.*/
ADCDriver ADCD1;
#endif
/*===========================================================================*/
/* Low Level Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level ADC driver initialization.
*/
void adc_lld_init(void) {
#if USE_STM32_ADC1
adcObjectInit(&ADCD1);
DMA1_Channel1->CPAR = (uint32_t)ADC1->DR;
ADCD1.ad_adc = ADC1;
ADCD1.ad_dma = DMA1_Channel1;
#endif
}
/**
* @brief Configures and activates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*/
void adc_lld_start(ADCDriver *adcp) {
/* If in stopped state then enables the ADC and DMA clocks.*/
if (adcp->ad_state == ADC_STOP) {
#if USE_STM32_ADC1
if (&ADCD1 == adcp) {
NVICEnableVector(DMA1_Channel1_IRQn, STM32_ADC1_IRQ_PRIORITY);
dmaEnable(DMA1_ID);
RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
}
#endif
}
}
/**
* @brief Deactivates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*/
void adc_lld_stop(ADCDriver *adcp) {
/* If in ready state then disables the SPI clock.*/
if (adcp->ad_state == ADC_READY) {
#if USE_STM32_ADC1
if (&ADCD1 == adcp) {
NVICDisableVector(DMA1_Channel1_IRQn);
dmaDisable(DMA1_ID);
RCC->APB2ENR &= ~RCC_APB2ENR_ADC1EN;
}
#endif
}
}
/**
* @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.
*/
void adc_lld_start_conversion(ADCDriver *adcp,
ADCConversionGroup *grpp,
void *samples,
size_t depth,
adccallback_t callback) {
}
/**
* @brief Stops an ongoing conversion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*/
void adc_lld_stop_conversion(ADCDriver *adcp) {
}
/** @} */
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