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Need SYS/BIOS6 HWI examples

Marko S
Intellectual 670 points

Other Parts Discussed in Thread: SYSBIOS

I need to find SYS/BIOS6 HWI examples for C6748 or C6746 to be able to understand how to configure an HWI.

I need to configure interrupts for the UART.

 

  • 0
    TI__Mastermind 45025 points

    Hi Marko Siponen,

    Unfortunately there is no specific HWI example.  However there is a SWI example that you can look at.

    The SWI configuration in the Swi example would be nearly identical to the configuration required for Hwi.  Please have a look at the Swi example and try from there.

    Steve

  • 0 in reply to Steven Connell
    Intellectual 670 points

    That sounds a bit strange. Isn't there any examples?

  • 0 in reply to Marko S
    Intellectual 670 points

    I got the following error message (assertion failure) when the board receives the first byte on the UART:

    ti.sysbios.gates.GateMutex: line 97: assertion failure: A_badContext: bad calling context. See GateMutex API doc for details.
    xdc.runtime.Error.raise: terminating execution

    When I looked in the GateMutex.c file on row 97 I saw the following:

        /* make sure we're not calling from Hwi or Swi context */
        Assert_isTrue(((BIOS_getThreadType() == BIOS_ThreadType_Task) ||
                       (BIOS_getThreadType() == BIOS_ThreadType_Main)),
                       GateMutex_A_badContext);

    It looks like the interrupt generated is not a HWI.

    I put a breakpoint in the HWI. I could se that it was called when the URAT received a byte.

    The problem was that I had a printf() in my HWI. When I removed it the HWI worked. Problem solved.

     

     

  • 0 in reply to Marko S
    TI__Mastermind 18320 points

    Marko,

    It looks like you resolved your issue, so we will mark this thread as Closed. 

    One comment: printf() is a non-realtime function call and is generally inappropriate for insertion into ISRs.  If you want to instrument your time critical processing, you should look into using the SYS/BIOS Log functions for this purpose.

    Dave