UART DMA not transmitting data properly

[fa31]

Hi,

I am working on a project and having the following problem:
My UART DMA is not working. I am transmitting a string, that should be visible in the terminal but it is not. The TX complete callback function is being triggered, so it looks like it works but there is nothing in the terminal.

Previously, I was using UART without DMA and things were working fine. It confirms that the hardware connections and the VCP connections are correctly set up.

What I have done so far:

- I enabled UART2, tested UART (without DMA). It worked well.

- I enabled DMA which gave me:

- Then I set up GPDMA1 for huart2_TX and huart2_RX. My TX configs are:

My main function:

int main(void)
{
  HAL_Init();
  SystemClock_Config();

  MX_GPIO_Init();
  MX_GPDMA1_Init();
  MX_ICACHE_Init();
  MX_USART2_UART_Init();


  /* Infinite loop */
  while (1)
  {
	  static uint32_t counter = 0;
	  sprintf((char *)pTxBuff, "Count: %lu\r\n", counter++);
	  if (huart2.gState == HAL_UART_STATE_READY) {
	      HAL_UART_Transmit_DMA(&huart2, pTxBuff, strlen((char *)pTxBuff));
	  }
	  HAL_Delay(1000);
  }
}

Does anyone have insights into why UART2 DMA transmission is not functioning correctly and why no output is appearing on the terminal, despite the transmission complete callback being triggered?

Thanks!

[mƎALLEm]

Hello,

What product are you using and what board are you using?

[Andrew Neil]

---

@fa31 wrote:

Previously, I was using UART without DMA and things were working fine.

---

If you go back to that, does it still work?

[fa31]

I am using:

CubeMX: to generate the code        Version: 6.14.1

CubeIDE: to debug the code            Version: 1.18.1

Board: Nucleo WBA65RI

[Andrew Neil]

What versions?

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