watchdog - infinite loop in an interrupt

Monica Zolog

Expert 1905 points

Hi everybody,

I have the following situation:

In an external interupt I must wait for a GPIO to go in H. So I have a while loop and in the condition I check the state of the GPIO. The watchdog is enabled and I service it outside the XINT. The question is what happens if the GPIO remain in L. Will the watchdog expire and trigger the WAKEINT as implemented, or the execution will remain in the infinite loop? I've tried to test this, but I cannot see anything in the debug window, it looks like the execution is forever in XINT, even if I switch the GPIO to H.

Can somebody explain what is happening? Why the watchdog doesn't expire?

Thanks,

Monica

over 12 years ago

0 Santosh Athuru over 12 years ago

TI__Mastermind 19810 points

Monica,

I guess both XINT and WAKEINT belong to the same PIE group so pre-emption is not be possible. Can you try letting WDOG triggering a reset or polling for WDINTS signal.

Best Regards

Santosh

0 Monica Zolog over 12 years ago in reply to Santosh Athuru

Expert 1905 points

I'm not sure i understand your question.

In the WAKEINT I let the Watchdog do a reset, but the execution doesn't reach that point.

Best regards,

Monica

0 Santosh Athuru over 12 years ago in reply to Monica Zolog

TI__Mastermind 19810 points

sorry, not in the WAKEINT but inside the XINT ISR where you are looping and are expecting WDOG to expire.

Best Regards

santosh

0 Monica Zolog over 12 years ago in reply to Santosh Athuru

Expert 1905 points

Something like a counter inside the while loop and when it gets to a certain value I should force a watchdog reset?

I've implemented something like this in the moment, but not so simple. I have a counter and some flags and conditons... I don't like it. your idea sounds better. the simpler, the better. I'll try it.

Thanks,

Monica

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watchdog - infinite loop in an interrupt