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what if the same Interrupt comes whihle still executing the Interrupt routeine?

Napon

Prodigy 230 points

1. what if the same Interrupt comes whihle still executing the Interrupt routeine?

as far as i know, then the same Interrupt request will be ignored.

is it right also for 6678L?

2. but if a Irq with higher priority comes, i though the cpu will wait until the old one finished then go for the higher priority one.

is it right also for 6678L?

thanks for your answers!

over 10 years ago

0 Napon over 10 years ago

Prodigy 230 points

i means, the same interrupt request comes while the cpu is still executing the interrupt routine.
sooory for the wroing typing.

0 Ganapathi Dhandapani95 over 10 years ago

TI__Mastermind 28085 points

Hi,

Ans1: Yes, user need to clear the corresponding interrupt flag for every time before accepting the next same interrupt.

Ans2: Yes.

Thanks,

0 Napon over 10 years ago in reply to Ganapathi Dhandapani95

Prodigy 230 points

hi ,

thanks a lot for your reply!

i got it. but one more doubt.

you said we need to clear the interrupt flag in oder to accept the next interrupt. but what if i clear the interrupt flag at the begining of my interrupt routine?

i thought the answer will be the same, it will still wait untill the routine finished.
right?

thanks!

0 Ganapathi Dhandapani95 over 10 years ago in reply to Napon

TI__Mastermind 28085 points

Clear the interrupt flag at your interrupt routine.

0 Napon over 10 years ago in reply to Ganapathi Dhandapani95

Prodigy 230 points

thanks for your answer, ganapathi!

but i just want to know what happens if i put the clear Irq flag instruction at the beginning of Routine, and now comes the same Interrupt request?

do you know the detail?

definitely you are right, it is recommended to place that instruction at the end of routine.

regards,!

0 Ganapathi Dhandapani95 over 10 years ago in reply to Napon

TI__Mastermind 28085 points

Hi,

I think you misunderstanding my reply. Please refer the MCSDK interrupt example for clear interrupt flag.
MCSDK examples: 1. "\ti\pdk_C6678_1_1_2_6\packages\ti\drv\hyplnk\example\common\hyplnkIsr.c"
2. "\ti\pdk_C6678_1_1_2_6\packages\ti\csl\example\cpintc\cpintc_test.c"

Thanks,