/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011,2012,2013 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 . */ /** * @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 local definitions. */ /*===========================================================================*/ /*===========================================================================*/ /* 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 */ /** @} */