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Blocking of the program flow with data reception with interruption through the USART port

JArri.1
Associate

‎2021-08-12 12:54 AM

I am having problems receiving data through the USART port. It enters the interrupt well but when it enters the HAL_UART_Receive function the program is blocked in the UART_WaitOnFlagUntilTimeout function.

As I understand it, this works, it waits until the RXNE bit is set to zero, but it is set to zero as soon as we enter the HAL_UART_Receive function.

I attach images so that you can see how my project code is, if someone can give me some advice whether I am doing it wrong or it is necessary to change something I would be very grateful.

0693W00000D2FJiQAN.png 

0693W00000D2FJsQAN.png 

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Tesla DeLorean
Guru

‎2021-08-12 4:46 AM

Don't seem to understand how interrupts work.

Don't use the blocking function, use the HAL_UART_ReceiveIT() externally, and manage the fill content of the array in the callback.

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TDK
Super User

‎2021-08-12 5:57 AM

Look at examples in CubeMX to understand the correct way to call things.

https://github.com/STMicroelectronics/STM32CubeF4/tree/2f3b26f16559f7af495727a98253067a31182cfc/Projects/STM32F429I-Discovery/Examples/UART

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