STM32L0 SPI DMA receive issue, clocks too many data

[martin2399]

Posted on March 26, 2017 at 18:55

I use SPI and DMA transfer.

I use the following functions:

HAL_StatusTypeDef HAL_SPI_Transmit_DMA(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size);

HAL_StatusTypeDef HAL_SPI_Receive_DMA(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size);

I have observed, that '

HAL_SPI_Receive_DMA

' clocks 16 bits, even though only 1 byte is read. The SPI is set up for 8 bit data.

Is this a known issue?

void HAL_SPI_Setup(void)
{
 Log_RegisterZone(LogZoneName, &u8logZoneLogLevel, &u8logZoneId, NULL);
 LOG_TRACE('Setup');
 SelectChannel(SPIQueue_Channel_None);
 SPIQueue_Init(HAL_SPI_NewDataQueuedSPI1Handler);
 __HAL_SPI_RESET_HANDLE_STATE(&HAL_SPI_SpiHandle);
 HAL_SPI_SpiHandle.Instance = SPI1;
 HAL_SPI_SpiHandle.Init.Mode = SPI_MODE_MASTER;
 HAL_SPI_SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
 HAL_SPI_SpiHandle.Init.Direction = SPI_DIRECTION_1LINE;
 HAL_SPI_SpiHandle.Init.CLKPhase = SPI_PHASE_2EDGE;
 HAL_SPI_SpiHandle.Init.CLKPolarity = SPI_POLARITY_HIGH;
 HAL_SPI_SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
 HAL_SPI_SpiHandle.Init.CRCPolynomial = 7;
 HAL_SPI_SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
 HAL_SPI_SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
 HAL_SPI_SpiHandle.Init.NSS = SPI_NSS_SOFT;
 HAL_SPI_SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
 if(HAL_SPI_Init(&HAL_SPI_SpiHandle) != HAL_OK)
 {
 // Initialization Error
 LOG_ERROR('Init');
 }
}

void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi)
{
 GPIO_InitTypeDef GPIO_InitStruct;
 if (hspi->Instance == SPI1)
 {
 // Enable peripherals and GPIO Clocks
 __HAL_RCC_GPIOA_CLK_ENABLE();
 // Enable SPI clock
 __HAL_RCC_SPI1_CLK_ENABLE();
 // Enable DMA1 clock
 __HAL_RCC_DMA1_CLK_ENABLE();
 // Configure peripheral GPIO
 HAL_IO_SetupOutputPin(&AcceleroMagneto_SPC, GPIO_MODE_AF_PP, GPIO_NOPULL, GPIO_SPEED_FREQ_MEDIUM, GPIO_AF0_SPI1, GPIO_PIN_SET);
 HAL_IO_SetupOutputPin(&AcceleroMagneto_SDIO, GPIO_MODE_AF_PP, GPIO_NOPULL, GPIO_SPEED_FREQ_MEDIUM, GPIO_AF0_SPI1, GPIO_PIN_SET);
 // Configure the DMA handler for Transmission process
 hdma_tx.Instance = DMA1_Channel3;
 hdma_tx.Init.Request = DMA_REQUEST_1;
 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_BYTE;
 hdma_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
 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 = DMA1_Channel2;
 hdma_rx.Init.Request = DMA_REQUEST_1;
 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_BYTE;
 hdma_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
 hdma_rx.Init.Mode = DMA_NORMAL;
 hdma_rx.Init.Priority = DMA_PRIORITY_HIGH;
 HAL_DMA_Init(&hdma_rx);
 // Associate the initialized DMA handle to the the SPI handle
 __HAL_LINKDMA(hspi, hdmarx, hdma_rx);
 
 // Configure the NVIC for SPI
 // NVIC configuration for DMA transfer complete interrupt (SPI1_TX / SPI1_RX)
 HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3, 0);
 EnableIRQ();
 }
}
void Test(void)
{
 uint8_t pu8data[10];
 // Clocks 8 bits
 HAL_SPI_Transmit_DMA(&HAL_SPI_SpiHandle, pu8data, 1);
 // Clocks 16 bits !!!
 HAL_SPI_Receive_DMA(&HAL_SPI_SpiHandle, pu8data, 1);
}
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