Hi  @Tesla DeLorean ,thanks for your reply. I did not find this function in my generated project. I suppose this is in HAL section of STM generated code, right? Should this not be done automatically if I enable global interrupt for USART1 in "Pinout ...

Hi @waclawek.jan ,thank you for your reply. The TX/RX pins from both MCUs are connected (soldered) with cable, STM MCU is in socket (please see pictures below, so NXP MCU RX pin is conected to PA_9 (Serial1_TX), NXP TX pin is connected to PA_10 (Seri...

Hi @Foued_KH ,thanks for your reply, sorry for late answer as I was on vacation last week (writing this from py private account...)Yes, I did enable global interrupt for relevant USART1 (please see screenshot below):. I think interrupt is working as ...