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Original question:

AM2434: MCU-PLUS-SDK-AM243X: R5F Interrupt priorities and interrupt nesting

AM2434: FreeRTOS and interrupt nesting on R5F

Johannes von Löwis
Expert 1786 points
Part Number: AM2434

The lack of support for nested interrupts in FreeRTOS (according to mcu_plus_sdk_am243x_08_03_00_18/docs/api_guide_am243x/KERNEL_FREERTOS_PAGE.html#autotoc_md356) is quite a restriction for us.

It would be helpful to know when TI plans to support nested interrupts in FreeRTOS.

Is there any recommended reading for us if we wanted try to make it work ourselves? I expect it to be more difficult than #defining HWIP_NESTED_INTERRUPTS_IRQ_ENABLE in  ./source/kernel/freertos/dpl/r5/HwiP_armv7r_handlers_freertos.c...

Best regards,

Johannes

  • +1
    TI__Mastermind 27743 points

    Hi Johannes,

    Yes, nested interrupt was disabled in SDK8.3 due to open debug (LwIP tests failure when nested interrupts are enabled).

    We are planning to fix this for SDK8.4 release (Aug end 2022).

    Meanwhile, I will check internally if can get patch for you to enable support. I will come back by tomorrow. Please feel free to ping if you don't hear from me.

    Regards,

    Prasad

  • 0 in reply to Prasad Jondhale
    TI__Mastermind 27743 points

    Hi Johannes,

    I checked internally. As you are not using industrial protocols, and current open issue with interrupt nesting is with it, you can go ahead and use interrupt nesting.

    To enable it, define flag HWIP_NESTED_INTERRUPTS_IRQ_ENABLE in ./source/kernel/freertos/dpl/r5/HwiP_armv7r_handlers_freertos.c.

    Regards,

    Prasad

  • 0 in reply to Prasad Jondhale
    Expert 1786 points

    Hi Prasad,

    I suppose, I need to rebuild freertos.am243x.r5f.ti-arm-clang.debug.lib after #defining HWIP_NESTED_INTERRUPTS_IRQ_ENABLE ?

    If yes, how do I do that?

    Best regards,

    Johannes

  • 0 in reply to Johannes von Löwis
    TI__Mastermind 27743 points

    Hi Johannes,

    Yes, you would need to rebuild the libraries. Kindly refer to below for same

    AM243x MCU+ SDK: Build a Hello World example (ti.com)

    Regards,

    Prasad

  • 0 in reply to Prasad Jondhale
    Expert 1786 points

    I'm getting:
    C:\ti\mcu_plus_sdk_am243x_08_03_00_18>gmake -s libs PROFILE=debug
    process_begin: CreateProcess(NULL, C:/ti/ccs1120/ccs/utils/cygwin/mkdir -p obj/am243x/ti-arm-clang/debug/r5f/board/, ...) failed.
    make (e=2): Das System kann die angegebene Datei nicht finden.
    makefile.am243x.r5f.ti-arm-clang:136: recipe for target 'obj/am243x/ti-arm-clang/debug/r5f/board/' failed
    gmake[2]: *** [obj/am243x/ti-arm-clang/debug/r5f/board/] Error 2
    makefile.am243x:408: recipe for target 'board_r5f.ti-arm-clang' failed
    gmake[1]: *** [board_r5f.ti-arm-clang] Error 2
    makefile:59: recipe for target 'libs' failed
    gmake: *** [libs] Error 2

    Where do I set the path to CCS? I'm still using version 11.1.0.

  • +1 in reply to Johannes von Löwis
    TI__Mastermind 27743 points

    Hi Johannes,

    You can set path in "mcu_plus_sdk_am243x_08_03_00_18\imports.mak"

    My recommendation is downloading the CCS11.2 as SDK is validated with it and we can't guarantee it will work with 11.1

    Regards,

    Prasad

  • 0 in reply to Prasad Jondhale
    Expert 1786 points

    Hi Prasad,

    after changing the toolchain path in imports.mak to 1.3.0.LTS I could compile the libraries and it seems that interrupt nesting now works as expected. I will have to make some more tests...

    BTW, when I tried to rebuild the libraries with toolchain version 2.1.0.LTS I got the following error:

     Compiling: freertos_fat.am243x.r5f.ti-arm-clang.debug.lib: C:/ti/mcu_plus_sdk_am243x_08_03_00_18/source/fs/freertos_fat/FreeRTOS-FAT/ff_ioman.c
    C:/ti/mcu_plus_sdk_am243x_08_03_00_18/source/fs/freertos_fat/FreeRTOS-FAT/ff_ioman.c:706:14: error: variable
          'ulFirstWord' set but not used [-Werror,-Wunused-but-set-variable]
        uint32_t ulFirstWord = 0ul;

    This looks a bit like a compiler error. At least I don't find a reason for that warning in ff_ioman.c (ulFirstWord is used!).

    Thank you for your support, Prasad!

    Best regards,

    Johannes

  • 0 in reply to Johannes von Löwis
    TI__Mastermind 27743 points

    Hi Johannes,

    Glad that you are able to proceed and nesting working for you.

    Regarding compiler issue, I have moved thread to compiler experts. Please feel free to ping if you don't hear from them.

    Regards,

    Prasad

  • 0 in reply to Johannes von Löwis
    TI__Guru**** 244190 points
    Johannes von Löwis said:
    This looks a bit like a compiler error.

    I need a test case that allows me to reproduce the same diagnostic.  I think I can develop that test case without directly involving you.  If not, I may come back here and ask you for help.

    Thanks and regards,

    -George