Unable to display messages on Tera Term via USART1 on STM32F429I-Discovery

[chachamaru]

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Hello,

I’m using the STM32F429I-Discovery board and trying to display “Hello World” on Tera Term via USART1 (PA9, PA10).

I configured the project in STM32CubeIDE as follows:

• USART1 → Mode: Asynchronous

• TX: PA9, RX: PA10

• Baudrate: 115200, 8N1, No Flow Control

• Using the ST-LINK Virtual COM Port (USB connector CN1)

main.c

HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();

const char msg[] = "Hello World\r\n";
HAL_UART_Transmit(&huart1, (uint8_t*)msg, sizeof(msg)-1, HAL_MAX_DELAY);
while (1)
{
HAL_UART_Transmit(&huart1, (uint8_t*)"Hello Again\r\n", 13, HAL_MAX_DELAY);
HAL_Delay(1000);
}

However, nothing appears on Tera Term.
The “ST-LINK Virtual COM Port (COMxx)” is visible in the Windows Device Manager, and I’ve selected the correct COM port in Tera Term.
Also, when I checked the PA9 pin with an oscilloscope, there was no signal output.

Has anyone successfully used USART1 on the F429I-Discovery board?
Any advice or examples on how to correctly enable UART output on this board would be greatly appreciated

[mƎALLEm]

Hello,

Are you sure about the board reference you are using? Is it STM32F429I-Discovery or NUCLEO-F429 board?

When you are talking about USART1 (PA9, PA10) it seems you are using NUCLEO-F429 board.

So please clarify that point.

[Andrew Neil]

---

@mƎALLEm wrote:

When you are talking about USART1 (PA9, PA10) it seems you are using NUCLEO-F429 board.

---

The 32F429IDISCOVERY manual says they are the correct pins:

https://www.st.com/resource/en/user_manual/um1670-discovery-kit-with-stm32f429zi-mcu-stmicroelectronics.pdf#page=15

via: https://www.st.com/en/evaluation-tools/32f429idiscovery.html#documentation

@chachamaru are you sure that your board hasn't been reconfigured (SB11 and/or SB15)?

Also, are you sure it's actually a STM32F429I-DISC1, not the older STM32F429I-DISCO ?

[Andrew Neil]

---

@chachamaru wrote:

I checked the PA9 pin with an oscilloscope, there was no signal output.

---

What about PA10 - ie, is stuff transmitted by the PC arriving at the STM32?

(beware that terminal software may buffer stuff)

---

@chachamaru wrote:

Any ... examples on how to correctly enable UART output on this board 

---

Have you tried the ready-made examples in STM32CubeIDE ?

PS:

Are you sure that your code has actually been built and downloaded to the board?

Have you tried stepping it in the debugger?

PPS:

Looking at your code, it has the MX_GPIO_Init() and MX_USART1_UART_Init() as typically generated by CubeMX, but none of the accompanying comments typically generated; eg,

  /* 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_SPI2_Init();
  MX_TIM6_Init();
  MX_USART2_UART_Init();
  MX_TIM16_Init();

  /* USER CODE BEGIN 2 */

In particular, you have none of the  /* USER CODE xxx */ comments - so all of your code will be deleted if you regenerate the project.

Could this be what's happened ... ?

[mƎALLEm]

---

@Andrew Neil wrote:

---

Also, are you sure it's actually a STM32F429I-DISC1, not the older STM32F429I-DISCO ?

---

Need to confirm first if the used board is a DISCO board and NOT a Nucleo board!