STM32F030 HAL_UART_Transmit problem

[er3481]

Hi,

I am trying to receive and trasnmit data with STM32F030C8 mcu, i can receive any data from serial monitor, but when i try to use HAL_UART_Transmit to send data, i can not see anything on serial monitor. Any advise?

uint8_t data[25];//this my data buffer to send
 
HAL_UART_Transmit(&huart2, data, sizeof(data), HAL_MAX_DELAY); //in startup i use this to send data bufer
 
 
static void MX_USART2_UART_Init(void)//this is my usart2 setup
{
 
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}

[waclawek.jan]

Read out and check/post the USART and relevant GPIO registers content.

JW

[S.Ma]

for uart, better use low layer.

[KnarfB]

If you can receive, you could do a loopback by connecting TX and RX directly and check transmission. And: check TX pin with a LA/scope. How accurate is the MCU/UART clock?