STM32H7S3L8 SPI Tx DMA burst

[simo zz]

Hi,

I am trying to use SPI6 transmission with GPDMA on STM32H7S3L8.

While Tx transfer works with simple IT handling, it doesn't work with DMA. No way...

To take things simple, I am trying a simple burst transfer (I will leave linked list for later), so I wrote this simple function:

void ConfigSPIxTxDMAChannel(
  DMA_TypeDef *p_gpdmax, 
  uint32_t p_channel, 
  SPI_TypeDef *p_spix,
  uint32_t p_burst_len,
  uint32_t p_src_addr) {

  LL_DMA_DisableIT_TO(p_gpdmax, p_channel);
  LL_DMA_DisableIT_SUSP(p_gpdmax, p_channel);
  LL_DMA_DisableIT_USE(p_gpdmax, p_channel);
  LL_DMA_DisableIT_ULE(p_gpdmax, p_channel);
  LL_DMA_DisableIT_DTE(p_gpdmax, p_channel);
  LL_DMA_DisableIT_HT(p_gpdmax, p_channel);
  LL_DMA_DisableIT_TC(p_gpdmax, p_channel);
  
  LL_DMA_DisableChannel(p_gpdmax, p_channel);
  LL_DMA_SetChannelPriorityLevel(p_gpdmax, p_channel, LL_DMA_HIGH_PRIORITY);
  LL_DMA_ConfigTransfer(p_gpdmax, p_channel, 
      LL_DMA_DEST_ALLOCATED_PORT1 |  \
      LL_DMA_SRC_ALLOCATED_PORT0 |  \
      LL_DMA_SRC_DATAWIDTH_BYTE |  \
      LL_DMA_DEST_DATAWIDTH_BYTE |  \
      LL_DMA_DEST_FIXED |  \
      LL_DMA_SRC_INCREMENT);

  LL_DMA_ConfigChannelTransfer(p_gpdmax, p_channel, 
      LL_DMA_HWREQUEST_SINGLEBURST |  \
      LL_DMA_DIRECTION_MEMORY_TO_PERIPH |  \
      LL_DMA_PFCTRL);
  
  LL_DMA_ConfigAddresses(p_gpdmax, p_channel, p_src_addr, LL_SPI_DMA_GetTxRegAddr(p_spix));
  LL_DMA_SetSrcBurstLength(p_gpdmax, p_channel, p_burst_len);
  LL_DMA_SetDestBurstLength(p_gpdmax, p_channel, p_burst_len);

    
  LL_DMA_EnableIT_TO(p_gpdmax, p_channel);
  LL_DMA_EnableIT_SUSP(p_gpdmax, p_channel);
  LL_DMA_EnableIT_USE(p_gpdmax, p_channel);
  LL_DMA_EnableIT_ULE(p_gpdmax, p_channel);
  LL_DMA_EnableIT_DTE(p_gpdmax, p_channel);
  LL_DMA_EnableIT_HT(p_gpdmax, p_channel);
  LL_DMA_EnableIT_TC(p_gpdmax, p_channel);

  LL_DMA_EnableChannel(p_gpdmax, p_channel);
}

while the piece of code for the transfer:

LL_SPI_Disable(SPI6);
// LL_SPI_Enable(SPI6);
ConfigSPIxTxDMAChannel(GPDMA1, LL_DMA_CHANNEL_2, SPI6, 64, (uint32_t) &spiTxDmaBuff);
// LL_SPI_SetTransferSize(SPI6, 64);
LL_SPI_EnableDMAReq_TX(SPI6);
LL_SPI_Enable(SPI6);
LL_SPI_StartMasterTransfer(SPI6);

But, as far I can see, the DMA always claims user configuration error (

Honestly I can't figure out why the request is not working.

I tried many times different approaches (with HAL as well), without success..

What is wrong with this setup?

Thanks,

s.