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tinySA/os/hal/platforms/STM32F0xx/adc_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file STM32F0xx/adc_lld.c
* @brief STM32F0xx ADC subsystem low level driver source.
*
* @addtogroup ADC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief ADC1 driver identifier.*/
#if STM32_ADC_USE_ADC1 || defined(__DOXYGEN__)
ADCDriver ADCD1;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Stops an ongoing conversion, if any.
*
* @param[in] adc pointer to the ADC registers block
*/
static void adc_lld_stop_adc(ADC_TypeDef *adc) {
if (adc->CR & ADC_CR_ADSTART) {
adc->CR |= ADC_CR_ADSTP;
while (adc->CR & ADC_CR_ADSTP)
;
}
}
/**
* @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_COMP_IRQHandler) {
uint32_t isr;
CH_IRQ_PROLOGUE();
isr = ADC1->ISR;
ADC1->ISR = isr;
/* It could be a spurious interrupt caused by overflows after DMA disabling,
just ignore it in this case.*/
if (ADCD1.grpp != NULL) {
/* 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 ((isr & ADC_ISR_OVR) &&
(dmaStreamGetTransactionSize(ADCD1.dmastp) > 0)) {
/* ADC overflow condition, this could happen only if the DMA is unable
to read data fast enough.*/
_adc_isr_error_code(&ADCD1, ADC_ERR_OVERFLOW);
}
if (isr & ADC_ISR_AWD) {
/* Analog watchdog error.*/
_adc_isr_error_code(&ADCD1, ADC_ERR_AWD);
}
}
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_COMP_IRQn,
CORTEX_PRIORITY_MASK(STM32_ADC_IRQ_PRIORITY));
/* Calibration procedure.*/
rccEnableADC1(FALSE);
chDbgAssert(ADC1->CR == 0, "adc_lld_init(), #1", "invalid register state");
ADC1->CR |= ADC_CR_ADCAL;
while (ADC1->CR & ADC_CR_ADCAL)
;
rccDisableADC1(FALSE);
}
/**
* @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);
#if STM32_ADCSW == STM32_ADCSW_HSI14
/* Clock from HSI14, no need for jitter removal.*/
ADC1->CFGR2 = 0x00001000;
#else
#if STM32_ADCPRE == STM32_ADCPRE_DIV2
ADC1->CFGR2 = 0x00001000 | ADC_CFGR2_JITOFFDIV2;
#else
ADC1->CFGR2 = 0x00001000 | ADC_CFGR2_JITOFFDIV4;
#endif
#endif
}
#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->CR = ADC_CR_ADEN;
while (!(adcp->adc->ISR & ADC_ISR_ADRDY))
;
}
}
/**
* @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);
/* Disabling ADC.*/
if (adcp->adc->CR & ADC_CR_ADEN) {
adc_lld_stop_adc(adcp->adc);
adcp->adc->CR |= ADC_CR_ADDIS;
while (adcp->adc->CR & ADC_CR_ADDIS)
;
}
#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, if it is defined a callback for the analog watch dog then it
is enabled.*/
adcp->adc->ISR = adcp->adc->ISR;
adcp->adc->IER = ADC_IER_OVRIE | ADC_IER_AWDIE;
adcp->adc->TR = grpp->tr;
adcp->adc->SMPR = grpp->smpr;
adcp->adc->CHSELR = grpp->chselr;
/* ADC configuration and start.*/
adcp->adc->CFGR1 = grpp->cfgr1 | ADC_CFGR1_CONT | ADC_CFGR1_DMACFG |
ADC_CFGR1_DMAEN;
adcp->adc->CR |= ADC_CR_ADSTART;
}
/**
* @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);
adc_lld_stop_adc(adcp->adc);
}
#endif /* HAL_USE_ADC */
/** @} */
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