I'm working on STM32H743 applied SPI DMA with MT25 QL128ABA1(NOR Flash) and initial mode to master mode.
My problem is I cannot receive (HAL_SPI_Receive_DMA) return data when I use HAL_SPI_Transmit_DMA by run code through but I can receive return data when I apply breakpoints before HAL_SPI_IRQHandler. I probe to confirm return data already.
The Nor flash must transmit command first and then receive return data later.
Note: I try to transmit data by using HAL_SPI_TransmitReceive_DMA then receive data by HAL_SPI_Receive_DMA it work!! but I want to know why I cannot use HAL_SPI_Transmit_DMA .
This is my configuration
/* Initialize the SPI module */
SpiHandle.Instance = SPI2;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
SpiHandle.Init.Mode = SPI_MODE_MASTER;
SpiHandle.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
SpiHandle.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;
HAL_SPI_Init(&SpiHandle);
/* Configure the DMA streams */
/* Configure the DMA handler for Transmission process */
DmaTxHandle.Instance = DMA2_Stream4;
DmaTxHandle.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
DmaTxHandle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
DmaTxHandle.Init.MemBurst = DMA_MBURST_SINGLE;
DmaTxHandle.Init.PeriphBurst = DMA_PBURST_SINGLE;
DmaTxHandle.Init.Request = DMA_REQUEST_SPI2_TX;
DmaTxHandle.Init.Direction = DMA_MEMORY_TO_PERIPH;
DmaTxHandle.Init.PeriphInc = DMA_PINC_DISABLE;
DmaTxHandle.Init.MemInc = DMA_MINC_ENABLE;
DmaTxHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
DmaTxHandle.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
DmaTxHandle.Init.Mode = DMA_NORMAL;
DmaTxHandle.Init.Priority = DMA_PRIORITY_LOW;
HAL_DMA_Init(&DmaTxHandle);
/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(&SpiHandle, hdmatx, DmaTxHandle);
/* Configure the DMA handler for Transmission process */
DmaRxHandle.Instance = DMA2_Stream3;
DmaRxHandle.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
DmaRxHandle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
DmaRxHandle.Init.MemBurst = DMA_MBURST_SINGLE;
DmaRxHandle.Init.PeriphBurst = DMA_PBURST_SINGLE;
DmaRxHandle.Init.Request = DMA_REQUEST_SPI2_RX;
DmaRxHandle.Init.Direction = DMA_PERIPH_TO_MEMORY;
DmaRxHandle.Init.PeriphInc = DMA_PINC_DISABLE;
DmaRxHandle.Init.MemInc = DMA_MINC_ENABLE;
DmaRxHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
DmaRxHandle.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
DmaRxHandle.Init.Mode = DMA_NORMAL;
DmaRxHandle.Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(&DmaRxHandle);
/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(&SpiHandle, hdmarx, DmaRxHandle);
HAL_NVIC_SetPriority(SPI2_IRQn, 8, 0);
HAL_NVIC_EnableIRQ(SPI2_IRQn);
/* Configure the NVIC for DMA */
/* NVIC configuration for DMA transfer complete interrupt (SPI2_TX) */
HAL_NVIC_SetPriority(DMA2_Stream4_IRQn, 8, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream4_IRQn);
/* NVIC configuration for DMA transfer complete interrupt (SPI2_RX) */
HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 8, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn);