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Trap Instruction

Stephen Mansfield
Intellectual 465 points

Hello,

I am new to programming the F28027.  Can someone give me an example for setting up the user interrupt vectors and a typical trap call.  I have looked throughout the ti site but have not found any examples.

Steve Mansfield

  • 0
    TI__Guru 61235 points

    Hi Steve,

    If you're new to programming the F28027, I've got to wonder why you are looking to use the software interrupts and trap.  This is far from the first thing a new user would be doing.  The software interrupts really don't buy you anything over just calling a function and turning off interrupts in the function.  TRAP was a way to do that quickly back in the day, when things ran at say 10 MHz.  Today, it is not used much.

    Look at the code examples for SPRA958:

    http://www.ti.com/mcu/docs/litabsmultiplefilelist.tsp?sectionId=96&tabId=1502&literatureNumber=spra958l&docCategoryId=1&familyId=1414

    See the code example F28027_example_nonBIOS_RAM or F28027_example_nonBIOS_Flash.  The interrupt vectors and stub ISRs are all setup, including the software interrupts.  If you want to use a TRAP from C, you'd need to use inline assembly code:

    asm(" TRAP #20");    // Vector to User interrupt #1

    Note that there is a space between the " and the TRAP.  This is required.

    Regards,

    David