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can't step into fiq handler

Max Cheng
Prodigy 110 points

I debug my code on TI8148 EVM with XDS100V2 USB simulator under ccs5.0.

for some reason, I need to trigger a fiq exception.  so i set the FIQNIRQ bit in INTCPS_ILR register,  but  when I run the instruction to trigger a fiq interrupt, the  ccsv5 can't step into my fiq handler function. for a moment, it then alert a dialog with the text as follows:

Warning:

Cannot halt the processor
(Error -2062) @ 30010 (0x753A)

Actually, when i clear the FIQNIRQ bit, ccsv5 can run into my irq handler function. I don't know what's wrong.

another question:

as you know, after reset, TI8148  with the ARM Cortex-A8 core execute the secue code stored in ROM memory first, then copy the bootloader from somewhere  to the RAM on chip and run as nonsecure.

the code in ROM seem to have configed the SCR register , so FIQ can be nonmaskable in the Nonsecure state. But is there any possibility to mask fiq in my code ?

because i need to mask it before my own operate system really start.

 

  • 0
    TI__Guru**** 466071 points

    Hi Max,

    Max Cheng said:
    for some reason, I need to trigger a fiq exception.  so i set the FIQNIRQ bit in INTCPS_ILR register,  but  when I run the instruction to trigger a fiq interrupt, the  ccsv5 can't step into my fiq handler function.

    I believe this is expected behavior for an FIQ with your device. The debugger would not have access in the ISR. I am trying to confirm this and will let you for sure when I have it.

    Max Cheng said:

    as you know, after reset, TI8148  with the ARM Cortex-A8 core execute the secue code stored in ROM memory first, then copy the bootloader from somewhere  to the RAM on chip and run as nonsecure.

    the code in ROM seem to have configed the SCR register , so FIQ can be nonmaskable in the Nonsecure state. But is there any possibility to mask fiq in my code ?

    because i need to mask it before my own operate system really start.

    I suggest posting this question in the DM814x forum. The experts there should be able to help you best.

    Thanks

    ki

  • 0 in reply to Ki
    Prodigy 110 points

    thanks for your reply, i will post it in the DM814x forum.