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tinySA/os/hal/platforms/STM32L1xx/adc_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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 STM32L1xx/adc_lld.c
* @brief STM32L1xx ADC subsystem low level driver source.
*
* @addtogroup ADC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief ADC1 driver identifier.*/
#if STM32_ADC_USE_ADC1 || defined(__DOXYGEN__)
ADCDriver ADCD1;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief ADC DMA ISR service routine.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] flags pre-shifted content of the ISR register
*/
static void adc_lld_serve_rx_interrupt(ADCDriver *adcp, uint32_t flags) {
/* DMA errors handling.*/
if ((flags & (STM32_DMA_ISR_TEIF | STM32_DMA_ISR_DMEIF)) != 0) {
/* DMA, this could help only if the DMA tries to access an unmapped
address space or violates alignment rules.*/
_adc_isr_error_code(adcp, ADC_ERR_DMAFAILURE);
}
else {
/* It is possible that the conversion group has already be reset by the
ADC error handler, in this case this interrupt is spurious.*/
if (adcp->grpp != NULL) {
if ((flags & STM32_DMA_ISR_HTIF) != 0) {
/* Half transfer processing.*/
_adc_isr_half_code(adcp);
}
if ((flags & STM32_DMA_ISR_TCIF) != 0) {
/* Transfer complete processing.*/
_adc_isr_full_code(adcp);
}
}
}
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_ADC_USE_ADC1 || defined(__DOXYGEN__)
/**
* @brief ADC interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(ADC1_IRQHandler) {
uint32_t sr;
CH_IRQ_PROLOGUE();
sr = ADC1->SR;
ADC1->SR = 0;
/* Note, an overflow may occur after the conversion ended before the driver
is able to stop the ADC, this is why the DMA channel is checked too.*/
if ((sr & ADC_SR_OVR) && (dmaStreamGetTransactionSize(ADCD1.dmastp) > 0)) {
/* ADC overflow condition, this could happen only if the DMA is unable
to read data fast enough.*/
if (ADCD1.grpp != NULL)
_adc_isr_error_code(&ADCD1, ADC_ERR_OVERFLOW);
}
/* TODO: Add here analog watchdog handling.*/
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level ADC driver initialization.
*
* @notapi
*/
void adc_lld_init(void) {
#if STM32_ADC_USE_ADC1
/* Driver initialization.*/
adcObjectInit(&ADCD1);
ADCD1.adc = ADC1;
ADCD1.dmastp = STM32_DMA1_STREAM1;
ADCD1.dmamode = STM32_DMA_CR_PL(STM32_ADC_ADC1_DMA_PRIORITY) |
STM32_DMA_CR_DIR_P2M |
STM32_DMA_CR_MSIZE_HWORD | STM32_DMA_CR_PSIZE_HWORD |
STM32_DMA_CR_MINC | STM32_DMA_CR_TCIE |
STM32_DMA_CR_DMEIE | STM32_DMA_CR_TEIE;
#endif
/* The shared vector is initialized on driver initialization and never
disabled.*/
nvicEnableVector(ADC1_IRQn, CORTEX_PRIORITY_MASK(STM32_ADC_IRQ_PRIORITY));
}
/**
* @brief Configures and activates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_start(ADCDriver *adcp) {
/* If in stopped state then enables the ADC and DMA clocks.*/
if (adcp->state == ADC_STOP) {
#if STM32_ADC_USE_ADC1
if (&ADCD1 == adcp) {
bool_t b;
b = dmaStreamAllocate(adcp->dmastp,
STM32_ADC_ADC1_DMA_IRQ_PRIORITY,
(stm32_dmaisr_t)adc_lld_serve_rx_interrupt,
(void *)adcp);
chDbgAssert(!b, "adc_lld_start(), #1", "stream already allocated");
dmaStreamSetPeripheral(adcp->dmastp, &ADC1->DR);
rccEnableADC1(FALSE);
}
#endif /* STM32_ADC_USE_ADC1 */
/* ADC initial setup, starting the analog part here in order to reduce
the latency when starting a conversion.*/
adcp->adc->CR1 = 0;
adcp->adc->CR2 = 0;
adcp->adc->CR2 = ADC_CR2_ADON;
}
}
/**
* @brief Deactivates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_stop(ADCDriver *adcp) {
/* If in ready state then disables the ADC clock and analog part.*/
if (adcp->state == ADC_READY) {
dmaStreamRelease(adcp->dmastp);
adcp->adc->CR1 = 0;
adcp->adc->CR2 = 0;
#if STM32_ADC_USE_ADC1
if (&ADCD1 == adcp)
rccDisableADC1(FALSE);
#endif
}
}
/**
* @brief Starts an ADC conversion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_start_conversion(ADCDriver *adcp) {
uint32_t mode;
const ADCConversionGroup *grpp = adcp->grpp;
/* DMA setup.*/
mode = adcp->dmamode;
if (grpp->circular) {
mode |= STM32_DMA_CR_CIRC;
}
if (adcp->depth > 1) {
/* If the buffer depth is greater than one then the half transfer interrupt
interrupt is enabled in order to allows streaming processing.*/
mode |= STM32_DMA_CR_HTIE;
}
dmaStreamSetMemory0(adcp->dmastp, adcp->samples);
dmaStreamSetTransactionSize(adcp->dmastp, (uint32_t)grpp->num_channels *
(uint32_t)adcp->depth);
dmaStreamSetMode(adcp->dmastp, mode);
dmaStreamEnable(adcp->dmastp);
/* ADC setup.*/
adcp->adc->SR = 0;
adcp->adc->SMPR1 = grpp->smpr1;
adcp->adc->SMPR2 = grpp->smpr2;
adcp->adc->SMPR3 = grpp->smpr3;
adcp->adc->SQR1 = grpp->sqr1;
adcp->adc->SQR2 = grpp->sqr2;
adcp->adc->SQR3 = grpp->sqr3;
adcp->adc->SQR4 = grpp->sqr4;
adcp->adc->SQR5 = grpp->sqr5;
/* ADC configuration and start, the start is performed using the method
specified in the CR2 configuration, usually ADC_CR2_SWSTART.*/
adcp->adc->CR1 = grpp->cr1 | ADC_CR1_OVRIE | ADC_CR1_SCAN;
if ((grpp->cr2 & ADC_CR2_SWSTART) != 0)
adcp->adc->CR2 = grpp->cr2 | ADC_CR2_CONT | ADC_CR2_DMA |
ADC_CR2_DDS | ADC_CR2_ADON;
else
adcp->adc->CR2 = grpp->cr2 | ADC_CR2_DMA |
ADC_CR2_DDS | ADC_CR2_ADON;
}
/**
* @brief Stops an ongoing conversion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_stop_conversion(ADCDriver *adcp) {
dmaStreamDisable(adcp->dmastp);
adcp->adc->CR1 = 0;
adcp->adc->CR2 = 0;
adcp->adc->CR2 = ADC_CR2_ADON;
}
/**
* @brief Enables the TSVREFE bit.
* @details The TSVREFE bit is required in order to sample the internal
* temperature sensor and internal reference voltage.
* @note This is an STM32-only functionality.
*/
void adcSTM32EnableTSVREFE(void) {
ADC->CCR |= ADC_CCR_TSVREFE;
}
/**
* @brief Disables the TSVREFE bit.
* @details The TSVREFE bit is required in order to sample the internal
* temperature sensor and internal reference voltage.
* @note This is an STM32-only functionality.
*/
void adcSTM32DisableTSVREFE(void) {
ADC->CCR &= ~ADC_CCR_TSVREFE;
}
#endif /* HAL_USE_ADC */
/** @} */
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