Hard reset on write USART.

[aaalex1234]

I apologize for my english.

I came across an incomprehensible thing for me (general experience with STM32 for about 10 years).

I work with STM32L010K8. When I try to write to USART2->TDR, I fall into reset. Test on Keil and IAR, different optimisation.

Has anyone come across this?

[Tesla DeLorean · Accepted solution]

Check for external shorting.

Try driving the UART TX pin as a GPIO​

[aaalex1234]

Thank you, you are right.

A TX port was knocked out, on the other board everything is fine.

Thanks again.