My code for SPI is quite rich as it includes a master/slave mode with interrupts and DMA.
So I'll show here the 5% which is for master mode extract code. 4 wire SPI on L4R5 @12MHz with SYSCLK = 48MHz
16 bit SPI mode
HAL_StatusTypeDef SPIP_MasterConfigureSpi(SPI_HandleTypeDef *hspi){
hspi->Instance = SPI2;
hspi->Init.Direction = SPI_DIRECTION_2LINES;
hspi->Init.CLKPhase = SPI_PHASE_1EDGE;
hspi->Init.CLKPolarity = SPI_POLARITY_LOW;
hspi->Init.DataSize = SPI_DATASIZE_16BIT;
hspi->Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi->Init.TIMode = SPI_TIMODE_DISABLE;
hspi->Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi->Init.CRCPolynomial = 7;
hspi->Init.CRCLength = SPI_CRC_LENGTH_8BIT;
hspi->Init.NSS = SPI_NSS_SOFT;
hspi->Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
hspi->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;//16;
hspi->Init.Mode = SPI_MODE_MASTER;
return (HAL_SPI_Init(hspi));
}
void SPIP_MasterConfigureDma(SPI_HandleTypeDef *hspi){
/* Configure the DMA handler for Transmission process */
pSPIP->hdma_tx->Instance = DMA1_Channel2;//DMA1_Channel5;
pSPIP->hdma_tx->Init.Request = DMA_REQUEST_SPI2_TX;//DMA_REQUEST_1;
pSPIP->hdma_tx->Init.Direction = DMA_MEMORY_TO_PERIPH;
pSPIP->hdma_tx->Init.PeriphInc = DMA_PINC_DISABLE;
pSPIP->hdma_tx->Init.MemInc = DMA_MINC_ENABLE;
pSPIP->hdma_tx->Init.PeriphDataAlignment = /*DMA_PDATAALIGN_BYTE;*/ DMA_PDATAALIGN_HALFWORD;
pSPIP->hdma_tx->Init.MemDataAlignment = /*DMA_MDATAALIGN_BYTE;*/ DMA_MDATAALIGN_HALFWORD;
pSPIP->hdma_tx->Init.Mode = DMA_NORMAL;
pSPIP->hdma_tx->Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(pSPIP->hdma_tx);
/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(hspi, hdmatx, *(pSPIP->hdma_tx));
/* Configure the DMA handler for Reception process */
pSPIP->hdma_rx->Instance = DMA1_Channel1;//DMA1_Channel4;
pSPIP->hdma_rx->Init.Request = DMA_REQUEST_SPI2_RX;//DMA_REQUEST_1;
pSPIP->hdma_rx->Init.Direction = DMA_PERIPH_TO_MEMORY;
pSPIP->hdma_rx->Init.PeriphInc = DMA_PINC_DISABLE;
pSPIP->hdma_rx->Init.MemInc = DMA_MINC_ENABLE;
pSPIP->hdma_rx->Init.PeriphDataAlignment = /*DMA_PDATAALIGN_BYTE;*/ DMA_PDATAALIGN_HALFWORD;
pSPIP->hdma_rx->Init.MemDataAlignment = /*DMA_MDATAALIGN_BYTE;*/ DMA_MDATAALIGN_HALFWORD;
pSPIP->hdma_rx->Init.Mode = DMA_NORMAL;
pSPIP->hdma_rx->Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(pSPIP->hdma_rx);
/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(hspi, hdmarx, *(pSPIP->hdma_rx));
}
// this function kicks normally within interrupt for multi-block transfer
HAL_StatusTypeDef SPIP_MasterSerialTransferStart_ISR(SPIP_t* pSPIP){
if(HAL_SPI_TransmitReceive_DMA(pSPIP->hspi, pSPIP->pMasterSerialTxBuffer, pSPIP->pMasterSerialRxBuffer, SERIAL_BLOCK_SIZE_WORD) != HAL_OK)
TrapError();
return HAL_OK;
}
