I have a STM32F031 Nucleo board. This board has a STM32F031K6T6 (LQFP32) micro controller. I am trying to set up command shell console so that I can use printf(). But it does not work. I have enabled huart1 and added this:- int _write() function.

Najam · ‎2023-04-25

Board is powered by an external power supply.

Tesla DeLorean · ‎2023-04-25

Ok, so if it's externally powered, is the USB/CDC connected? Is that where you expect to see data?

Is there an LED you can toggle to see signs-of-life? Or can you use a scope on the USART1_TX pin to see output?

Test the USART output functions directly. Output 'U' patterns so you can confirm baud rate with a scope.

Make sure there are suitable printf() libraries linked. The .MAP should indicate what went into the final build, and also the size of the code.

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Tesla DeLorean · ‎2023-04-25

Ok, so if it's externally powered, is the USB/CDC connected? Is that where you expect to see data?

Is there an LED you can toggle to see signs-of-life? Or can you use a scope on the USART1_TX pin to see output?

Test the USART output functions directly. Output 'U' patterns so you can confirm baud rate with a scope.

Make sure there are suitable printf() libraries linked. The .MAP should indicate what went into the final build, and also the size of the code.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..

Najam · ‎2023-04-25

Thanks Tesla,

I got this working.