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LAUNCHXL-F280039C: Reading of program counter

Dekel Guterman
Intellectual 330 points

Part Number: LAUNCHXL-F280039C

Hi,

I'm working on the hard fault handler and I need to read and store some registers values.

Please provide the assembly code that let me read the program counter.

Thanks,

Dekel

  • 0
    TI__Mastermind 30185 points

    Hello Dekel,

    The instruction "MOV XARn, PC" can be used to move the program counter value into a register (from XAR0 to XAR7). This can be found in the TMS320C28x CPU and Instruction Set Reference Guide.

    Best regards,

    Omer Amir

  • 0 in reply to Omer Amir
    Intellectual 330 points

    Hi Omer,

    Thanks for your response.

    I'm running the code below but it doesn't work.

    Please advise how to implement it correctly.

    Regards,

    Dekel

    C code:

    uint32_t pc = _getPC();

    ASM code:

    ;;*****************************************************************************
    ;; Get Program Counter
    ;;*****************************************************************************
    _getPC:
                 MOV XAR5, PC
                 POP XAR5
                 LRETR

  • 0 in reply to Dekel Guterman
    TI__Mastermind 30185 points

    Hello Dekel,

    Why are you popping XAR5? This will overwrite the XAR5 register with the data the stack pointer is currently pointing to (pop from the stack), thus erasing your PC value. If you change this to PUSH, what value do you see?

    Best regards,

    Omer Amir