Simple UART not working on nucleoH755ZIQ

[Jad]

good morning. since this morning, on my nucleoH755ZIQ I am trying to make work my UART connection. I followed the stm video on YouTube and did as said:

connected USART 2 (doesn't USART 1 work?)

and then implemented the simple code 

 in the while loop of my main. unfortunately, when I run the console, nothing appears. I even tried it on putty and again nothing came out. so I decided to change board and take the NUCLEO C031C6 but this time could not even access the USART 2.

 

does somebody knows what could be the problem or have a simple code I could try to understand if the problem is the hardware or the software?

best regards 

[SofLit · Accepted solution]

Hello,

If you are using Virtual Comport of STLINK, this is normal as USART1 is not connected to the VCP but USART3.

So use USART3 instead with the correct Tx/Rx pins.

Please review the board schematics before suspecting an issue in the software.

Hope it helps

[Jad]

thank you for the response, I was searching virtual com port and not vcc so I did no see it. however I got another problem on stm32: USART mode 3 is impossible to put the mode into available:

I wanted to do it manually by turning directly the pins of PD9 and PD10 into tx nd rx but it doesn't want to turn on the usart3. I think I am missing something.

[SofLit]

Hello @Jad,

I suggest to open a new thread regarding the last question.

Thank you.