UART doesn't work

[_Louis_]

Hi evryone,

I'm trying to initialise a very basic UART communication between my stm32 L552ZE-Q and my computer by following this tutorial: https://www.youtube.com/watch?v=dEQwSl8mCFs&t=924s

I have no errors, no warning while compiling and the problem is that there is nothing displayed on the PuTTy teminal. I also used TeraTerm and VScode serial terminal and nothing happened. I tried also on an other computer and same problem.

I have upgraded the code by adding a blinking LED to verify if something is even running and the LED is blinking but again nothing on Putty...

  while (1)
  {

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
	  HAL_UART_Transmit(&huart2, tx_buffer, 27, 10);
	  HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_9);
	  HAL_Delay(1000);
  }

I've checked the COM port used in my device manager and set the correct Baud rate, I don't know to do next.

Thank you for your help!

Louis

[Karl Yamashita]

You'd have to wait for ST to fix it or you'll have to manually write the configurations. Or try another Nucleo board that doesn't have the same issue.

[Andrew Neil]

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@_Louis_ Some other options:

•  use a different UART, and a separate external USB-to-UART adapter
• reconfigure the board (as shown in the UM) to connect USART3 (on PD8,PD9) to the ST-Link instead.