Posted on June 18, 2016 at 20:23Hi,
change in the ''SPI_FullDuplex_ComDMA'' to work in 16bits mode.
change in the ''stm32l4xx_hal_msp.c'' file:
//**************************************************************
hdma_tx.Instance = SPIx_TX_DMA_CHANNEL;
hdma_tx.Init.Request = SPIx_TX_DMA_REQUEST;
hdma_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; hdma_tx.Init.MemDataAlignment = DMA_PDATAALIGN_HALFWORD; hdma_tx.Init.Mode = DMA_NORMAL;
hdma_tx.Init.Priority = DMA_PRIORITY_LOW;
HAL_DMA_Init(&hdma_tx);
/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(hspi, hdmatx, hdma_tx);
/* Configure the DMA handler for Transmission process */
hdma_rx.Instance = SPIx_RX_DMA_CHANNEL;
hdma_rx.Init.Request = SPIx_RX_DMA_REQUEST;
hdma_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; hdma_rx.Init.MemDataAlignment = DMA_PDATAALIGN_HALFWORD; hdma_rx.Init.Mode = DMA_NORMAL;
hdma_rx.Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(&hdma_rx);
//***********************************************************
Change in the main.c file:
//****************************************************************
SpiHandle.Instance = SPIx;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.DataSize = SPI_DATASIZE_16BIT; SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
sTxBuf[0] = 0x54C2;
if(HAL_SPI_TransmitReceive_DMA(&SpiHandle, (uint8_t *)&sTxBuf[0], (uint8_t *)aRxBuffer, 1) != HAL_OK)
{
Error_Handler();
}
If the the length field is 1, like above. SPI line transmit 16 bits: 00C2
If the length is 2, SPI line trasmit 32 bits: 00C20054.
If I use:
HAL_SPI_Transmit(&SpiHandle, (uint8_t*) &sTxBuf[0], 1,10);
SPI line transmit correctly: 0x54C2
I tried the same with the STM32F303RE and it transmits correctly in 16 bits using DMA or not.
Should it be some bug in the STM32L4 hardware?
//****************************************************************
