DMA interrupt not triggering after init

[Klassic]

After setting configuration registers in HAL_DMA_Start_IT, DMA fails to fire back interrupt, HAL_DMA_IRQHandler(). The TransferComplete call back routine is not called but only once after reset since HAL_DMA_IRQHandler() is called only once after initialization. Flags CC1DE and CC1IE are set after initialization and never change there after. I am trying to read a parallel ADC through GPIO using DMA with interrupt and timer input capture. I am using STM32L496ZG ucontroller and used CUBEMX to generate code.

Also, I am using Timer2 with input capture mode to request DMA transfer. And using MCO to generate 2 MHz to feed to PA0 for timer2 ch1.

I searched the forum and checked almost everything. I used latest  CUBEMX 6.11.1 version.

Your help is greatly appreciated.
Thanks

Here is my initzn part;

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

  /* Initialize all configured peripherals */
  MX_DMA_Init();
  MX_GPIO_Init();
  MX_TIM2_Init();
  MX_USART2_UART_Init();
	if(DWT_Delay_Init())
	HAL_UART_Transmit(&huart2, (uint8_t *)"\r\nClkTick started", 17, HAL_MAX_DELAY);
	else
	HAL_UART_Transmit(&huart2, (uint8_t *)"\r\nClkTicks fail to start", 4, HAL_MAX_DELAY);

  /* USER CODE BEGIN 2 */
  if (HAL_DMA_Start_IT(htim2.hdma[TIM_DMA_ID_CC1], &GPIOE->IDR, (uint32_t)&aDST_Buffer, BUFFER_SIZE) != HAL_OK)
  {
    /* Transfer Error */
    Error_Handler();
  }

  // Attach DMA callback functions
  htim2.hdma[TIM_DMA_ID_CC1]->XferHalfCpltCallback = HalfTransferComplete;
  htim2.hdma[TIM_DMA_ID_CC1]->XferCpltCallback = TransferComplete;
  htim2.hdma[TIM_DMA_ID_CC1]->XferErrorCallback = TransferError;

  // Enable timer to trigger DMA transfer - CC1DE bit
  __HAL_TIM_ENABLE_DMA(&htim2, TIM_DMA_CC1);
  // Enable timer input capture
  HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);

  /* USER CODE END 2 */

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

           DMA Req setting: >Mode: Normal. 

And this is the data transfer callback routines:

static void HalfTransferComplete(DMA_HandleTypeDef *hdma_tim2_ch1) {
    int position = 0;
    LastITHalfComplete = 1;
    /*Copy the first part of the received buffer */
    for (int i = 0; i < HALF_BUFFER_SIZE; i++) {
        aFull_Buffer[FullDataIndex] = aDST_Buffer[i+position];
        FullDataIndex++;
        //HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1);
    }
}
static void TransferComplete(DMA_HandleTypeDef *hdma_tim2_ch1)
{
    int position = HALF_BUFFER_SIZE;
    LastITHalfComplete = 0;

    /* Copy the second part of the received buffer */
    for (int i = 0; i < HALF_BUFFER_SIZE; i++) {
    aFull_Buffer[FullDataIndex] = aDST_Buffer[i+position];
        FullDataIndex++;
        HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0);
    }
    transferComplete = 1;
}

static void TransferError(DMA_HandleTypeDef *hdma_tim2_ch1) {
    HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_14);
}

[SofLit]

Hello,

As you need to transfer data from GPIO IDR to a memory, how did you configure the DMA? Peripheral to Memory? If yes this that's not the correct config.

You need to consider the GPIO register as a memory location so you need to configure it as Memory to Memory.

You can also refer to this application note AN4666.

Read also this post: https://community.st.com/t5/stm32-mcus-products/stm32f429-read-from-pin-to-dma/m-p/683278

[Klassic]

Thanks SofLit, 

As you know there's no Mem to Mem option available in recent cubeMx. Only Periph to Mem Or Mem to Periph. I read somewhere that Periph to Mem is same as Mem to Mem. plz correct me.

According to AN4666 doc, DMA1Ch5 was selected using Tim2Ch1. And I did the same.

For timer in Inp capture, I am using falling edge to trigger DMA.

Thanks

[SofLit]

Hello,

How?

[Klassic]

I was checking here.

Ok. But if I did be selecting DMA MEM to MEM directly without timer, then how to connect it to timer pulse trigger? I mean, what condition will trigger a DMA request? Which channel to choose along with DMA2?

Thanks 

[waclawek.jan]

Is the DMA set to Circular? If not, how do you start it again?

JW

[Klassic]

Hi jan,

Sorry for late reply. I was working to put changes suggested by SofLit and DMA setting to circular, but could not succeed. DMA is set to normal.

Also, I could not accommodate MEM to MEM DMA change, as I could not connect interrupt trigger by timer with DMA.

  Still struggling to get it work.

Thanks