How to perform continuous sending and reading with DMA ?

[DYann.1]

Hello,

I looked at an example of DMA on CubeMX and I got this code :

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

    /* USER CODE BEGIN 3 */
    if (transferErrorDetected == 1)
    {
      /* Toggle LED4 with a period of 200 ms */
      BSP_LED_Toggle(LED4);
      HAL_Delay(200);
    }
    if (transferCompleteDetected == 1)
    {
      /* Turn LED4 on*/
      BSP_LED_On(LED4);
      transferCompleteDetected = 0;
    }
  }
  /* USER CODE END 3 */
}

It only works once, how to repeat this sending infinitely ?

  /* Configure the source, destination and buffer size DMA fields and Start DMA Channel/Stream transfer */
  /* Enable All the DMA interrupts */
  if (HAL_DMA_Start_IT(&hdma_memtomem_dma1_channel1, (uint32_t)&aSRC_Const_Buffer, (uint32_t)&aDST_Buffer, BUFFER_SIZE) != HAL_OK)
  {
    /* Transfer Error */
    Error_Handler();
  }

Do I have to stop the DMA, recover the data and restart the DMA each time ?

 Thank you for your answer

[DYann.1]

Hi,

This program is an example of ST it doesn't come from me. As I say before, the program it executes only once so how can it encounter an error because it must be able to at least a second time. Right ? unless the ST program contains an error.

When the program starts LED4 is off, and I put

I put 2 breakpoints at this level, Error_Handler and transferErrorDetected. And I never enter this breakpoint in DEBUG mode.

I pause and put a breakpoint at that level and the program never stops, that's why I say the program only transmits once. And I would like the sending and receiving to be continuous.

To switch to circular DMA mode it's impossible since I have no choice