Why is HAL_UART_Receive_IT not triggering the callback function on STM32F103?

[timdavid0812]

I’m using HAL_UART_Receive_IT() on an STM32F103 to receive serial data asynchronously. The UART initialization appears correct, and I can send data successfully, but the HAL_UART_RxCpltCallback() function never gets triggered. I’ve confirmed the interrupt is enabled in NVIC and the buffer size is correct.

Is there something I might be missing in configuration or code structure that prevents the callback from firing?
Any sample code or debugging steps would be greatly appreciated. Thanks!

[Ozone]

What UART interrupts do you configure, and do they fire ?
Assuming RxNE, set a corresponding breakpoint in the interrupt handler.

Do you see any signal on the Rx pin when the other side transmits ?

[Andrew Neil]

Welcome to the forum.

Please see How to write your question to maximize your chances to find a solution for best results.

 

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@timdavid0812 wrote:

Is there something I might be missing 

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We can't see your code, so we can't say what might be missing or incorrect!

See: How to insert source code.

[Saket_Om]

Hello @timdavid0812 

Please refer to the example below:

Projects/STM3210C_EVAL/Examples/UART/UART_TwoBoards_ComIT