How to activate FIQ interrupt?

Simon lapointe

Other Parts Discussed in Thread: SYSBIOS

Hello,

I'm using a FIQ interrupt along the BIOS with no problem.

But I want to make my FIQ interrupt reeantrant, i.e activate the FIQ interrupt within the ISR, at the beginning. And I don't know how.

I have verify with the debugger and the ISR is NOT reeantrant by default at least.

I call _enable_interrupts() as starting the application and it works ok all the way, but it seems to cause problem to the sysbios is I also call it into the FIQ ISR in order to make it reeantrant.

My setup:

TMS570, sysbios 3.20.8.88, IPC 1.22.3.23, CCS 5.1 N201104171800

Simon

over 13 years ago

0 ScottG over 13 years ago

TI__Mastermind 26780 points

Simon,

Have you tried the _enable_FIQ() instrinsic instead of _enable_interrupts()? I’m sort of guessing here... but wonder if _enable_interrupts() is more than you want to do in that FIQ, and if you should only be enabling FIQs instead.

Scott

0 Simon lapointe over 13 years ago in reply to ScottG

Expert 1315 points

Ok the _enable_FIQ() works, you're right.

But now the problem is that the application crashes after it quits the first FIQ reeantrance.

I have to check why. But the stack seems ok at first sight.

Simon

0 ToddMullanix over 13 years ago in reply to Simon lapointe

TI__Guru* 96960 points

FYI: there is a Hwi_enableFIQ. It looks like it just calls _enable_FIQ though.

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How to activate FIQ interrupt?