Unable to use USART1 to output in serial on STM32H7B3I-DK

[JTurn.2]

I am having trouble trying to output data via USART1 on my STM32H7B3I-DK. According to the doc (UM2569), USART1 is a virtual com port connected to the USB STLINK (CN14). So I should theoretically be able to use USART1 to output to my serial console via the Mirco-USB connected to my laptop? But for some reason my serial console isn't outputting anything at all. I have already checked that the settings for USART1 in STM32CubeMX and serial console match, so I am assuming it has nothing to do with my serial console's settings.

Here is a code snippet of my main loop and USART1. The code was essentially generated by STM32CubeMX after I selected the correct discovery board in 'board selector'.

int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* 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();
 
/* Configure the peripherals common clocks */
  PeriphCommonClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_FMC_Init();
  MX_I2C1_Init();
  MX_I2C4_Init();
  MX_I2S6_Init();
  MX_LTDC_Init();
  MX_OCTOSPI1_Init();
  MX_RTC_Init();
  MX_SDMMC1_SD_Init();
  MX_SPI1_Init();
  MX_SPI2_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();
  /* USER CODE BEGIN 2 */
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
		uint8_t Test[] = "Hello World !!!\r\n"; //Data to send
		HAL_UART_Transmit(&huart1,Test,sizeof(Test),10);// Sending in normal mode
		HAL_Delay(1000);
  }
  /* USER CODE END 3 */
}
static void MX_USART1_UART_Init(void)
{
 
  /* USER CODE BEGIN USART1_Init 0 */
 
  /* USER CODE END USART1_Init 0 */
 
  /* USER CODE BEGIN USART1_Init 1 */
 
  /* USER CODE END USART1_Init 1 */
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART1_Init 2 */
 
  /* USER CODE END USART1_Init 2 */
 
}

Thank you for your help!

[Tesla DeLorean]

It's not necessary to like your own posts.

Check that it's not ending up in the Error_Handler() or other while loop, stop/check with a debugger.

Check RCC, GPIO and USART1 register settings.

Check define for HSE_VALUE, or clock from the HSI clock source.

[JTurn.2 · Accepted solution]

I see. Thank you for your advice. I used the debugger to step through my code and realised that there's an event handler error at 'MX_SDMMC1_SD_Init' which was stopping the rest of the code from running as I did not have a micro SD card inserted in my board. I managed to get a reading after adding an sd card to my board or by commenting out the event handler.