[RESOLVED] Watchdog Timer Fails to Reset

cmerck · ‎2011-03-07

Posted on March 07, 2011 at 21:06

Tesla DeLorean · ‎2011-05-17

Posted on May 17, 2011 at 14:26

Disconnect the debugger, use a serial port console to observe or gather telemetry. There is a setting, as I recall, that prevents it working when the debugger is active.

Also other things to check on a HW level, are things clamping reset pins high for instance.

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cmerck · ‎2011-05-17

Posted on May 17, 2011 at 14:26

Clive,

Thanks so much for the lead.

My problem was that an AND gate, which was being used to multiplex several hardware reset sources, was contending with the internal reset circuitry. Addition of a diode or replacement of the gate with an open-drain output AND gate resolves the issue.

Cheers,

Chris