Interrupt Flag Register is not updated

Eng.ahmed Shaaban

Hi everyone,

I face a problem with debugging IFR .

I'm using CCS v5.1 and SYS/BIOS v6 .

here is the problem : I configured a GPIO (bank 7) pin (PIN 4) to signal event on rising edge (Event no 72) which in turn generates interrupt using HWI no 6 .

All that is fine and works, but when i try to trace IFR6 when interrupt happens ,IFR value is not updated although IER6 is enabled and ISR code is executed.

So, why IFR value doesn't change?

over 13 years ago

0 Ki over 13 years ago

TI__Guru**** 463941 points

Hello,

This question is probably best served by the folks in the device forum. What device are you using?

Thanks

0 Douglas Gwyn over 13 years ago

Expert 2210 points

The interrupt service routine (ISR) will never see the IFR bit set for the interrupt level that caused that interrupt. See the section on interrupts in the DSP reference manual.

If you're trying to use the same ISR for more than one interrupt priority level, there is no simple way to discover which of the possible interrupt levels triggered the ISR. Instead, use a separate ISR for each level. They could, for example, call a common interrupt-handling function with an integer argument set to the specific level for the ISR that called that function.

0 Eng.ahmed Shaaban over 13 years ago in reply to Ki

Prodigy 250 points

Thanks Ki-Soo,

I'm using OMAP L138 and working on C6748.

0 Eng.ahmed Shaaban over 13 years ago in reply to Douglas Gwyn

Prodigy 250 points

Hi Douglas ,

You are right about that " The interrupt service routine (ISR) will never see the IFR bit set for the interrupt level that caused that interrupt " ,but what i mean is IFR doesn't change before getting into ISR although interrupt works fine .

So, how could this happen?

Thanks.

0 sung chul woo over 12 years ago in reply to Eng.ahmed Shaaban

Intellectual 430 points

Hi Shaaban.

I have exactly same problem like you.

My ISR function and IER, CSR register work well,

but IFR has always 0, and ISTP doesn't change.

If you solved this problem, let me know about this.

Thanks.

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Interrupt Flag Register is not updated