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AWRL1432: Hardware interrupt priority issue in FreeRTOS

Ken Zhang
Expert 3425 points
Part Number: AWRL1432

Hi Experts

Customer is reading the codes of FreeRTOS and HWA driver for BSD use case.

They find that configMAX_SYSCALL_INTERRUPT_PRIORITY is 0xE0 and the HW interrpt priority of HWA is 1 which means HW interrupt is of higher priority than configMAX_SYSCALL_INTERRUPT_PRIORITY.

However according to FreeRTOS doc,  we should never call a FreeRTOS API in an Interrupt handler which is of of higher priority than configMAX_SYSCALL_INTERRUPT_PRIORITY.

So it may be illegal to call semephore_post in HWA interrupt handler,  is this statement correct?

Thanks

Ken

  • +1
    TI__Genius 13206 points

    Hey Ken,

    As of SDK 5.4.0.0, the HWA interrupt priorities should be less than "configKERNEL_INTERRUPT_PRIORITY" and "configMAX_API_CALL_INTERRUPT_PRIORITY" as per FreeRTOS recommendations. This is mentioned in the release notes of the SDK documentation. 

    Regards,

    Kristien