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Floating Point Unit Issue in TM4C123GH6PM

Islam Elnady
Intellectual 340 points
Other Parts Discussed in Thread: TM4C123GH6PM

Most of the codes I flash to the Tiva C tm4c123gh6pm with setting FPU to be used, the code doesn't run and sometimes it gives me HARD_FAULT_HANDLER when I debug. But it works just fine when I disable FPU... Any idea why ?

  • 0
    Guru 11940 points

    Any idea why ?

    Either the FPU is not enabled at all, thus failing on the first FPU instruction.

    Or, saving the FPU context during interrupts is enabled, but the stack is not large enough. That would account for the "sometines" appeareance, since the hardfault happens asynchronous with an interrupt.

  • 0 in reply to f. m.
    Guru 47900 points

    May I commend poster f.m. for (yet another) most excellent, "Answering Response."

    While targeted towards the FPU - other MCU peripheral faults also may be avoided by:

    • insuring that the peripheral IS properly enabled
    • insuring that the stack is sized sufficiently to meet that peripheral's requirement

    Specific solutions are helpful - f.m.'s more "universal" solution - provides (even) greater power & value!