Hi,
I'm trying to use SPI Tx DMA transfer on a Nucleo STM32H563ZI board connected to a LCD module that works on 3wire spi, so just 1Tx line. I know the SPI configuration and code for the LCD driver is OK because everything works if I run in interrupt mode but when trying to send data over SPI DMA it fails.
My SPI and DMA configuration looks like this.
__HAL_RCC_GPDMA1_CLK_ENABLE();
/* SPI1 GPDMA Init */
target_hgpdma1_spi1_tx.Instance = GPDMA1_Channel0;
target_hgpdma1_spi1_tx.Init.Request = GPDMA1_REQUEST_SPI1_TX;
target_hgpdma1_spi1_tx.Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
target_hgpdma1_spi1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
target_hgpdma1_spi1_tx.Init.SrcInc = DMA_SINC_INCREMENTED;
target_hgpdma1_spi1_tx.Init.DestInc = DMA_DINC_FIXED;
target_hgpdma1_spi1_tx.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_HALFWORD;
target_hgpdma1_spi1_tx.Init.DestDataWidth = DMA_DEST_DATAWIDTH_HALFWORD;
target_hgpdma1_spi1_tx.Init.Priority = DMA_LOW_PRIORITY_HIGH_WEIGHT;
target_hgpdma1_spi1_tx.Init.SrcBurstLength = 1;
target_hgpdma1_spi1_tx.Init.DestBurstLength = 1;
target_hgpdma1_spi1_tx.Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0 | DMA_SRC_ALLOCATED_PORT1;
target_hgpdma1_spi1_tx.Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
target_hgpdma1_spi1_tx.Init.Mode = DMA_NORMAL;
if( HAL_DMA_Init(&target_hgpdma1_spi1_tx) == HAL_OK ){
__HAL_LINKDMA( &target_hspi1, hdmatx, target_hgpdma1_spi1_tx);
/* DMA interrupt init */
HAL_NVIC_SetPriority(GPDMA1_Channel0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(GPDMA1_Channel0_IRQn);
/*!< SPI configuration */
target_hspi1.Instance = LCD_SPI;
target_hspi1.Init.Direction = SPI_DIRECTION_1LINE;
target_hspi1.Init.Mode = SPI_MODE_MASTER;
target_hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
target_hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
target_hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
target_hspi1.Init.NSS = SPI_NSS_SOFT;
target_hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
target_hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
target_hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
target_hspi1.Init.CRCPolynomial = 7;
target_hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
target_hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
HAL_SPI_Init( &target_hspi1 );
HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(SPI1_IRQn);
}
The problem I see is that when I call HAL_SPI_Transmit_DMA(&target_hspi1, data, dataSize); the DMA transfer complete callback gets executed and the EOT interrupt gets enabled but there is no interrupt generated after that and the HAL_SPI_IRQHandler never marks the transmition as completed and the hspi1 state remains as TX_BUSY.
static void SPI_DMATransmitCplt(DMA_HandleTypeDef *hdma)
{
SPI_HandleTypeDef *hspi = (SPI_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
if (hspi->State != HAL_SPI_STATE_ABORT)
{
if (hspi->hdmatx->Mode == DMA_LINKEDLIST_CIRCULAR)
{
#if (USE_HAL_SPI_REGISTER_CALLBACKS == 1UL)
hspi->TxCpltCallback(hspi);
#else
HAL_SPI_TxCpltCallback(hspi);
#endif /* USE_HAL_SPI_REGISTER_CALLBACKS */
}
else
{
/* Enable EOT interrupt */
__HAL_SPI_ENABLE_IT(hspi, SPI_IT_EOT);
}
}
}
I'm new to the STM32H5x series and I noticed the DMA has new features compared to previous STM32 devices that I've used in the past so I'm probably missing something.
The DMA transmission is 8192bytes.
All IO pins and clock sources have been enabled.
I have written a callback for the TxCpltCallback to set a flag to be able to transmit the next frame, this works for the interrupt mode, but for DMA transfer it never gets called even though the DMA Transfer complete was called
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi)
{
if (hspi->Instance==DISPL_SPI) {
Displ_SpiAvailable=1;
}
}
Any hints?
Thanks,
Martin
