STM32F429-NUCLEO-144 UART3 IS NOT RECEIVING

[pratheep]

Posted on February 21, 2018 at 04:06

Hi,

I amUsing STM32F429-NUCLEO- I write the code for UART3 transmit/receive (poling method) and the board is transmitting but the data is not receiving. Pls help me to fix the issue.

Find the attached source code

Thanks,

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[Tesla DeLorean]

Posted on February 21, 2018 at 05:00

...

/* Infinite loop */

/* USER CODE BEGIN WHILE */ HAL_UART_Transmit(&huart3, pbufftx, strlen(pbufftx), 0xFFFF);

while (1)

{ // Perhaps use the debugger as see what != HAL_OK values are returned

if(HAL_UART_Receive(&huart3, pbuffrx, 1, 0xFFFF)==HAL_OK)

{ HAL_UART_Transmit(&huart3, pbuffrx, 1, 0xFFFF); }

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}

/* USER CODE END 3 */

...

[Tesla DeLorean]

Posted on February 21, 2018 at 05:15

Alternative

while (1) {  if (USART3->SR & 0x20) // RXNE    USART3->DR = USART3->DR; // Echo  if (USART3->SR & 0x0F) // Errors    USART3->DR; // Clear }

[pratheep]

Posted on February 21, 2018 at 06:10

this also not working.

[Tesla DeLorean]

Posted on February 21, 2018 at 06:24

Perhaps it is not actually receiving data? Don't open a peripheral view of the USART in the debugger.

Check GPIO settings in debugger.

[pratheep]

Posted on February 21, 2018 at 06:56

 Gpio settings are correct(PD8 and PD9 is used for USART) 

Still no data receiving

[Bogdan Golab]

Posted on February 21, 2018 at 08:19

It's nucleo board so you should be able to use the VCOM - does it work fine? It eliminated external UART-to-USB converter as ST-LINK provides this feature.

[pratheep]

Posted on February 21, 2018 at 07:41

receive process ends with hall time out ;(

[Bogdan Golab]

Posted on February 21, 2018 at 07:55

Connect TXD with RXD using a wire (simple testing loop), send a few char and after receiving a char switch on a LED. Just to eliminate the cabling issue (not sure what you are connecting the uart3 to).

Second, does it imply that other uarts work fine?

[pratheep]

Posted on February 21, 2018 at 08:11

I have verified the cable connection with PC and it is correct. The nucleo board can transmit data but not receiving and always exit with time out. I tested UART2 and 3 both are behaving same.

The simple testing loop also not working.