Question
STM32F7 SPI DMA triggered by EXTI
Posted on October 20, 2017 at 14:50
Hi All
I'm looking for solution. I have to communicate my external ADC with STM32F7 by SPI. I have request from ADC on DRDY pin with 50kHz, which I set as EXTI in the procesor. But how to control SPI DMA by this DRDY PIN? On each falling edge on DRDY, SPI should read 12Bytes.
I want to fill buffer with e.g. 500 data rates from ADC and then do something with it.
My code:
/* SPI1 controller clock enable */
__SPI1_CLK_ENABLE(); /* DMA controller clock enable */ __HAL_RCC_DMA2_CLK_ENABLE();/* DMA interrupt init */
/* DMA2_Stream0_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, DMA2_Stream0_IRQn_Priority, DMA2_Stream0_IRQn_SubPriority); HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn); /* DMA2_Stream3_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, DMA2_Stream3_IRQn_Priority, DMA2_Stream3_IRQn_SubPriority); HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn); /* Peripheral DMA init*/ dma_rx_handle.Instance = DMA2_Stream0; dma_rx_handle.Init.Channel = DMA_CHANNEL_3; dma_rx_handle.Init.Direction = DMA_PERIPH_TO_MEMORY; dma_rx_handle.Init.PeriphInc = DMA_PINC_DISABLE; dma_rx_handle.Init.MemInc = DMA_MINC_ENABLE; dma_rx_handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; dma_rx_handle.Init.MemDataAlignment = DMA_PDATAALIGN_BYTE; dma_rx_handle.Init.Priority = DMA_PRIORITY_MEDIUM; dma_rx_handle.Init.Mode = DMA_CIRCULAR; dma_rx_handle.Init.FIFOMode = DMA_FIFOMODE_ENABLE; dma_rx_handle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL; dma_rx_handle.Init.MemBurst = DMA_MBURST_SINGLE; /* Deinitialize the stream for new transfer */ HAL_DMA_DeInit(&dma_rx_handle); if (HAL_DMA_Init(&dma_rx_handle) != HAL_OK) { while(1); }__HAL_LINKDMA(&hspi1,hdmarx,dma_rx_handle);
/* SPI1_TX Init */ dma_tx_handle.Instance = DMA2_Stream3; dma_tx_handle.Init.Channel = DMA_CHANNEL_3; dma_tx_handle.Init.Direction = DMA_MEMORY_TO_PERIPH; dma_tx_handle.Init.PeriphInc = DMA_PINC_DISABLE; dma_tx_handle.Init.MemInc = DMA_MINC_DISABLE; dma_tx_handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; dma_tx_handle.Init.MemDataAlignment = DMA_PDATAALIGN_BYTE; dma_tx_handle.Init.Priority = DMA_PRIORITY_MEDIUM; dma_tx_handle.Init.FIFOMode = DMA_FIFOMODE_DISABLE; dma_tx_handle.Init.Mode = DMA_CIRCULAR; /* Deinitialize the stream for new transfer */ HAL_DMA_DeInit(&dma_tx_handle); if (HAL_DMA_Init(&dma_tx_handle) != HAL_OK) { while(1); }__HAL_LINKDMA(&hspi1,hdmatx,dma_tx_handle);
// HAL_NVIC_SetPriority(SPI1_IRQn, SPI1_IRQn_Priority, SPI1_IRQn_SubPriority);// HAL_NVIC_EnableIRQ(SPI1_IRQn); // SPI configuration hspi1.Instance = SPI_NUMBER; hspi1.Init.Mode = SPI_MODE_MASTER; hspi1.Init.Direction = SPI_DIRECTION_1LINE; hspi1.Init.DataSize = SPI_DATASIZE_8BIT; hspi1.Init.CLKPolarity = SPI_POLARITY_LOW; hspi1.Init.CLKPhase = SPI_PHASE_1EDGE; hspi1.Init.NSS = SPI_NSS_SOFT; hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4; hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB; hspi1.Init.TIMode = SPI_TIMODE_DISABLED; hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED; hspi1.Init.CRCPolynomial = 7; hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE; hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE; HAL_SPI_Init(&hspi1); inkr_buff_spi = 0;HAL_SPI_Receive_DMA(&hspi1, (uint8_t *) &SPI_RX_BUFF[inkr_buff_spi], sizeof(SPI_RX_BUFF) );
//HAL_SPI_TransmitReceive_DMA(&hspi1, SPI_TX_BUFF, (uint8_t *) &SPI_RX_BUFF[inkr_buff_spi], sizeof(SPI_RX_BUFF) );HAL_NVIC_SetPriority(SPI_ADS1274_RDY_EXTI_IRQn, SPI_ADS1274_EXTI_Priority, SPI_ADS1274_EXTI_SubPriority);
HAL_NVIC_EnableIRQ(SPI_ADS1274_RDY_EXTI_IRQn);#stm32f7