USART3 not transmitting data on NUCLEO F767ZI

[s319189]

I’ve set pin PD8 and PD9 for USART3 and I’ve checked the baud rate that is 115200, but usart3 does not transmit data to serial monitor yet. How can I solve the problem?

[Karl Yamashita]

Did you check with scope if there is data being transmitted?

 

You don’t check the HAL status so how do you know if it was a good send?

HAL_StatusTypeDef hal_status = HAL_OK;


hal_status = HAL_UART_Transmit_DMA(...);
if(hal_status != HAL_OK)
{
 // do something
}

From there you can check what hal_status returns, HAL_OK, HAL_BUSY or HAL_ERROR

 

For a quick check, just use HAL_UART_Transmit to see if it’s a HW or UART configuration setup issue.