STM32F767ZI and USART by HAL.

[Lagodolio]

Hello,

I have a strange problem with my STM32F767 ZI and USART communication.

With CubeMX, I set USART2->Asyncronous, SYS->Debug Serial Wire and RCC-> HSE Active (crystal/ceramic resonator).

So I generated a project for Atollic Truestudio and inserted

HAL_Delay(500);
  while (1)
     {
       /* USER CODE END WHILE */
       /* USER CODE BEGIN 3 */
      
        HAL_UART_Transmit(&huart2,"Hello",5,1000);
 
    //Toggle On board LEDSs, for testing...
       HAL_GPIO_TogglePin(led2_GPIO_Port,led2_Pin);
       HAL_Delay(500);
 
       HAL_GPIO_TogglePin(led3_GPIO_Port,led3_Pin);
       HAL_Delay(500);
    }
 
 /* USER CODE END 3 */

After compiling (without errors) and resetting, program runs correctly (on board LEDs swith on/off) but no message to my terminal.

I connect my Nucleo to CN1 (ST-link USB port) as I do with my F4, but without success.

Serial config is OK.

Any suggest?

Thanks and best regards

[AvaTar]

How about working backwards ?

Next thing would be to check if there is a signal on the TX lines while sending - on both ends.

If not, the init code is probably not correct.

[Lagodolio]

The code is quite simple, generated by CubeMX plus few lines - at first it was simply:

HAL_Delay(500);
  while (1)
     {
       /* USER CODE END WHILE */
       /* USER CODE BEGIN 3 */
      
        HAL_UART_Transmit(&huart2,"Hello",5,1000);
 
    }
 
 /* USER CODE END 3 */

With my STM32F446RE I haven't problems, but with F7s it doesn't work...

Is it possible there is a different approach to USB communication (F446RE has a single USB port)?

I generally use STlink USB port as a VirtualCOM and it works well (tested with speed from 9600 to 460800). As terminal I use TeraTERM, Putty and Arduino Serial Monitor.

In Debug mode, HAL_UART_Transmit instruction is processed but nothing appears on TeraTerm windows.

CubeMX set the typical stm32 PA2(TX) and PA3(RX), but F767ZI pinout doesn't refer PA2 as UART pin on CN12...

[Lagodolio]

ops... the last part of my message was cut off...

If I connect a Logic Analizer on TX pin-CN5 (ST-Link "half board") no signal is recorded, so AvaTar is right, there is a init problem. Is it possible that ST-link TX pin isn't PA2 and I didn't understand STM schematics?

Thanks, AvaTar, for your help!

[Lagodolio]

News about HAL_UART_Transmit(): if I connect a serial-to-USB device (a cheap SiliconLabs CP210x) to UART2 TX pin, I can view my message on terminal. So the problem isn't HAL function but it is the communication (or link) between UART2 (or UART3?) to USB CN1.

I can see "ST link Virtual Port" as in my F4, but (probably) I cannot initialize my code to use it....