reset reason for C5505?

Richard von Lehe58975

I can't seem to find any status register that can be read after a reset to ascertain whether the reset was caused by a watchdog timeout. I have known other processors to provide something like this, does the C5505 not offer this?

over 14 years ago

0 Mugdha Gadkari over 14 years ago

TI__Intellectual 1035 points

Hello,

You can use the Timer Interrupt Aggregation Flag Register (TIAFR) to find out which Timer generated the single Timer CPU interrupt signal. Refer to section 6.14 of the Timer/Watchdog Timer user guide.

Regards,

Mugdha

0 Richard von Lehe58975 over 14 years ago in reply to Mugdha Gadkari

Intellectual 470 points

Hi Mugdha,

Are you suggesting using a timer in conjunction with the watchdog or instead of? I really do want to use the watchdog because it covers more failure cases than a simple timer can (e.g. a timer will not work if the timer's interrupt handler code becomes overwritten by a stray pointer). In any case, it appears that the hard reset that follows the watchdog timeout resets all registers leaving no indication behind that a watchdog timeout occured. I had hoped that a status bit could let us know so we could keep track of how often the firmware locked/failed.

Regards,

Rich

0 Mugdha Gadkari over 14 years ago in reply to Richard von Lehe58975

TI__Intellectual 1035 points

Rich,

You are right. I don't think there is an easy way to find out if the reset was caused by the watchdog timer since all registers are reset.

-Mugdha

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reset reason for C5505?