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Error in Interrupt function

Donald Varela9
Prodigy 130 points

I am using a TM4C1294XL development board and TI-RTOS tirtos_tivac_2_14_00_10 and XDC xdctools_3_31_02_38_core.  I used the TI Uart Console example and added a function and initiated it with the following.

GPIO_setCallback(Board_PP4, gpioSpeedFxn0);
GPIO_clearInt(Board_PP4);
GPIO_enableInt(Board_PP4);

I made changes to Board.h,EK_TM4C1294XL.c and EK_TM4C1294XL.h.

The interrupt works great but when I put a printf in the FXN I get the following error:

{module#37}: line 99: assertion failure: A_badContext: bad calling context. See
GateMutex API doc for details.
xdc.runtime.Error.raise: terminating execution

printf works in the console FXN.

I have read many solutions to this problem but none make much sense.

  • 0
    TI__Mastermind 32475 points

    You cannot call printf from your Interrupt function.  This is not safe as printf may actually stop the cpu and break real-time.  By default you can only call printf from main or a Task thread because its using a GateMutex.

    What are the solutions that doesn't make sense to you?

    Judah