PSSI TX only with DMA in STM32H533R generated no data output on GPIO's

[berait]

Hi folks,

I have started a very basic PSSI project with CubeMX with the STM32H533R. I send 10 bytes of data to the PSSI in 8 bit mode without any additional control lines (RDY and DE switched off). In the beginning I thought everything works well. I have reached the HAL_PSSI_TxCpltCallback() function, indicating that the whole buffer was send out. I also placed a debug pin before calling the dma transmitt function and clear it in the HAL_PSSI_TxCpltCallback() to measure the transmit delay and the tx time by varying the data length to be send from 10byte to 20byte, and I can see the difference in time on the debig pin with an oscilloscope. 

BUT the only problem I have is that there is absolut no data output on any of the 8 GPIOs. Everything seems to be correct (clock, alternate pin function, drive level,...)
Can anybode see a problem in my code:

void HAL_PSSI_TxCpltCallback(PSSI_HandleTypeDef *hpssi)
{
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_4, GPIO_PIN_SET);
  PSSI_TransmitComplete_count++;
}

void HAL_PSSI_ErrorCallback(PSSI_HandleTypeDef *hpssi)
{
	__NOP();
}

/* Private user code ---------------------------------------------------------*/
void HighPrio_ControlLoop(void)
{
  /* USER CODE BEGIN ControlLoop */
  /* Infinite loop */
  for(;;)
  {
	/* Start transmitting the received & modified data */
	  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_4, GPIO_PIN_RESET);
	if (HAL_PSSI_Transmit_DMA(&hpssi, (uint32_t*)aTxBuffer, sizeof(aTxBuffer)) != HAL_OK)
	{
		__NOP();
	}

	while (PSSI_TransmitComplete_count != 1);
	PSSI_TransmitComplete_count = 0;
	HAL_Delay(1);
  }
}

Here is the Init and the MSP code:

void HAL_PSSI_MspInit(PSSI_HandleTypeDef* hpssi)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hpssi->Instance==PSSI)
  {
    /* USER CODE BEGIN PSSI_MspInit 0 */

    /* USER CODE END PSSI_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_DCMI_PSSI_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    /**PSSI GPIO Configuration
    PA4     ------> PSSI_DE
    PA6     ------> PSSI_PDCK
    PB15     ------> PSSI_D2
    PC6     ------> PSSI_D0
    PC7     ------> PSSI_D1
    PC9     ------> PSSI_D3
    PC11     ------> PSSI_D4
    PB4(NJTRST)     ------> PSSI_D7
    PB6     ------> PSSI_D5
    PB7     ------> PSSI_RDY
    PB8     ------> PSSI_D6
    */
    GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF13_PSSI;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_15|GPIO_PIN_4|GPIO_PIN_6|GPIO_PIN_7
                          |GPIO_PIN_8;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF13_PSSI;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_11;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF13_PSSI;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF13_PSSI;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    /* PSSI DMA Init */
    /* GPDMA1_REQUEST_DCMI Init */
    handle_GPDMA1_Channel0.Instance = GPDMA1_Channel0;
    handle_GPDMA1_Channel0.Init.Request = GPDMA1_REQUEST_DCMI;
    handle_GPDMA1_Channel0.Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
    handle_GPDMA1_Channel0.Init.Direction = DMA_PERIPH_TO_MEMORY;
    handle_GPDMA1_Channel0.Init.SrcInc = DMA_SINC_FIXED;
    handle_GPDMA1_Channel0.Init.DestInc = DMA_DINC_FIXED;
    handle_GPDMA1_Channel0.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_BYTE;
    handle_GPDMA1_Channel0.Init.DestDataWidth = DMA_DEST_DATAWIDTH_BYTE;
    handle_GPDMA1_Channel0.Init.Priority = DMA_LOW_PRIORITY_LOW_WEIGHT;
    handle_GPDMA1_Channel0.Init.SrcBurstLength = 1;
    handle_GPDMA1_Channel0.Init.DestBurstLength = 1;
    handle_GPDMA1_Channel0.Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0|DMA_DEST_ALLOCATED_PORT0;
    handle_GPDMA1_Channel0.Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
    handle_GPDMA1_Channel0.Init.Mode = DMA_NORMAL;
    if (HAL_DMA_Init(&handle_GPDMA1_Channel0) != HAL_OK)
    {
      Error_Handler();
    }

    __HAL_LINKDMA(hpssi, hdmatx, handle_GPDMA1_Channel0);

    if (HAL_DMA_ConfigChannelAttributes(&handle_GPDMA1_Channel0, DMA_CHANNEL_NPRIV) != HAL_OK)
    {
      Error_Handler();
    }

    /* PSSI interrupt Init */
    HAL_NVIC_SetPriority(DCMI_PSSI_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(DCMI_PSSI_IRQn);
    /* USER CODE BEGIN PSSI_MspInit 1 */

    /* USER CODE END PSSI_MspInit 1 */

  }


static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* USER CODE BEGIN MX_GPIO_Init_1 */

  /* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_4, GPIO_PIN_RESET);

  /*Configure GPIO pin : PC4 */
  GPIO_InitStruct.Pin = GPIO_PIN_4;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* USER CODE END MX_GPIO_Init_2 */
}

static void MX_GPDMA1_Init(void)
{

  /* USER CODE BEGIN GPDMA1_Init 0 */

  /* USER CODE END GPDMA1_Init 0 */

  /* Peripheral clock enable */
  __HAL_RCC_GPDMA1_CLK_ENABLE();

  /* GPDMA1 interrupt Init */
    HAL_NVIC_SetPriority(GPDMA1_Channel0_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(GPDMA1_Channel0_IRQn);

  /* USER CODE BEGIN GPDMA1_Init 1 */

  /* USER CODE END GPDMA1_Init 1 */
  /* USER CODE BEGIN GPDMA1_Init 2 */

  /* USER CODE END GPDMA1_Init 2 */

}

the main() is very straignt forward:

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_GPDMA1_Init();
  MX_ICACHE_Init();
  MX_PSSI_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  HighPrio_ControlLoop();
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

Thank you for any advice on that!

Bets regards, Benedikt