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mayhem-firmware/firmware/chibios/os/hal/platforms/STM32F4xx/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 STM32F4xx/adc_lld.c
* @brief STM32F4xx/STM32F2xx ADC subsystem low level driver source.
*
* @addtogroup ADC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define ADC1_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_ADC_ADC1_DMA_STREAM, STM32_ADC1_DMA_CHN)
#define ADC2_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_ADC_ADC2_DMA_STREAM, STM32_ADC2_DMA_CHN)
#define ADC3_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_ADC_ADC3_DMA_STREAM, STM32_ADC3_DMA_CHN)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief ADC1 driver identifier.*/
#if STM32_ADC_USE_ADC1 || defined(__DOXYGEN__)
ADCDriver ADCD1;
#endif
/** @brief ADC2 driver identifier.*/
#if STM32_ADC_USE_ADC2 || defined(__DOXYGEN__)
ADCDriver ADCD2;
#endif
/** @brief ADC3 driver identifier.*/
#if STM32_ADC_USE_ADC3 || defined(__DOXYGEN__)
ADCDriver ADCD3;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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_TCIF) != 0) {
/* Transfer complete processing.*/
_adc_isr_full_code(adcp);
}
else if ((flags & STM32_DMA_ISR_HTIF) != 0) {
/* Half transfer processing.*/
_adc_isr_half_code(adcp);
}
}
}
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_ADC_USE_ADC1 || STM32_ADC_USE_ADC2 || STM32_ADC_USE_ADC3 || \
defined(__DOXYGEN__)
/**
* @brief ADC interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(ADC1_2_3_IRQHandler) {
uint32_t sr;
CH_IRQ_PROLOGUE();
#if STM32_ADC_USE_ADC1
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.*/
#endif /* STM32_ADC_USE_ADC1 */
#if STM32_ADC_USE_ADC2
sr = ADC2->SR;
ADC2->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(ADCD2.dmastp) > 0)) {
/* ADC overflow condition, this could happen only if the DMA is unable
to read data fast enough.*/
if (ADCD2.grpp != NULL)
_adc_isr_error_code(&ADCD2, ADC_ERR_OVERFLOW);
}
/* TODO: Add here analog watchdog handling.*/
#endif /* STM32_ADC_USE_ADC2 */
#if STM32_ADC_USE_ADC3
sr = ADC3->SR;
ADC3->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(ADCD3.dmastp) > 0)) {
/* ADC overflow condition, this could happen only if the DMA is unable
to read data fast enough.*/
if (ADCD3.grpp != NULL)
_adc_isr_error_code(&ADCD3, ADC_ERR_OVERFLOW);
}
/* TODO: Add here analog watchdog handling.*/
#endif /* STM32_ADC_USE_ADC3 */
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_DMA_STREAM(STM32_ADC_ADC1_DMA_STREAM);
ADCD1.dmamode = STM32_DMA_CR_CHSEL(ADC1_DMA_CHANNEL) |
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
#if STM32_ADC_USE_ADC2
/* Driver initialization.*/
adcObjectInit(&ADCD2);
ADCD2.adc = ADC2;
ADCD2.dmastp = STM32_DMA_STREAM(STM32_ADC_ADC2_DMA_STREAM);
ADCD2.dmamode = STM32_DMA_CR_CHSEL(ADC2_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_ADC_ADC2_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
#if STM32_ADC_USE_ADC3
/* Driver initialization.*/
adcObjectInit(&ADCD3);
ADCD3.adc = ADC3;
ADCD3.dmastp = STM32_DMA_STREAM(STM32_ADC_ADC3_DMA_STREAM);
ADCD3.dmamode = STM32_DMA_CR_CHSEL(ADC3_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_ADC_ADC3_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(ADC_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 */
#if STM32_ADC_USE_ADC2
if (&ADCD2 == adcp) {
bool_t b;
b = dmaStreamAllocate(adcp->dmastp,
STM32_ADC_ADC2_DMA_IRQ_PRIORITY,
(stm32_dmaisr_t)adc_lld_serve_rx_interrupt,
(void *)adcp);
chDbgAssert(!b, "adc_lld_start(), #2", "stream already allocated");
dmaStreamSetPeripheral(adcp->dmastp, &ADC2->DR);
rccEnableADC2(FALSE);
}
#endif /* STM32_ADC_USE_ADC2 */
#if STM32_ADC_USE_ADC3
if (&ADCD3 == adcp) {
bool_t b;
b = dmaStreamAllocate(adcp->dmastp,
STM32_ADC_ADC3_DMA_IRQ_PRIORITY,
(stm32_dmaisr_t)adc_lld_serve_rx_interrupt,
(void *)adcp);
chDbgAssert(!b, "adc_lld_start(), #3", "stream already allocated");
dmaStreamSetPeripheral(adcp->dmastp, &ADC3->DR);
rccEnableADC3(FALSE);
}
#endif /* STM32_ADC_USE_ADC3 */
/* This is a common register but apparently it requires that at least one
of the ADCs is clocked in order to allow writing, see bug 3575297.*/
ADC->CCR = (ADC->CCR & (ADC_CCR_TSVREFE | ADC_CCR_VBATE)) |
(STM32_ADC_ADCPRE << 16);
/* 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.*/
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
#if STM32_ADC_USE_ADC2
if (&ADCD2 == adcp)
rccDisableADC2(FALSE);
#endif
#if STM32_ADC_USE_ADC3
if (&ADCD3 == adcp)
rccDisableADC3(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;
uint32_t cr2;
const ADCConversionGroup *grpp = adcp->grpp;
/* DMA setup.*/
mode = adcp->dmamode;
if (grpp->circular) {
mode |= STM32_DMA_CR_CIRC;
if (adcp->depth > 1) {
/* If circular buffer depth > 1, then the half transfer interrupt
is enabled in order to allow 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->SQR1 = grpp->sqr1;
adcp->adc->SQR2 = grpp->sqr2;
adcp->adc->SQR3 = grpp->sqr3;
/* ADC configuration and start.*/
adcp->adc->CR1 = grpp->cr1 | ADC_CR1_OVRIE | ADC_CR1_SCAN;
/* Enforcing the mandatory bits in CR2.*/
cr2 = grpp->cr2 | ADC_CR2_DMA | ADC_CR2_DDS | ADC_CR2_ADON;
/* The start method is different dependign if HW or SW triggered, the
start is performed using the method specified in the CR2 configuration.*/
if ((cr2 & ADC_CR2_SWSTART) != 0) {
/* Initializing CR2 while keeping ADC_CR2_SWSTART at zero.*/
adcp->adc->CR2 = (cr2 | ADC_CR2_CONT) & ~ADC_CR2_SWSTART;
/* Finally enabling ADC_CR2_SWSTART.*/
adcp->adc->CR2 = (cr2 | ADC_CR2_CONT);
}
else
adcp->adc->CR2 = cr2;
}
/**
* @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;
}
/**
* @brief Enables the VBATE bit.
* @details The VBATE bit is required in order to sample the VBAT channel.
* @note This is an STM32-only functionality.
* @note This function is meant to be called after @p adcStart().
*/
void adcSTM32EnableVBATE(void) {
ADC->CCR |= ADC_CCR_VBATE;
}
/**
* @brief Disables the VBATE bit.
* @details The VBATE bit is required in order to sample the VBAT channel.
* @note This is an STM32-only functionality.
* @note This function is meant to be called after @p adcStart().
*/
void adcSTM32DisableVBATE(void) {
ADC->CCR &= ~ADC_CCR_VBATE;
}
#endif /* HAL_USE_ADC */
/** @} */
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