[En-Nut-Discussion] Watchdog maybe and nutos 3.9.5

[Brett Abbott]

Hi

I think Im doing something quite wrong and would appreciate any feedback...

When I enable the watchdog at 2.1 seconds, Im finding that the system is 
reseting itself in much shorter timeframe - and the MCUCSR flags are not 
showing watchdog reset (or any reset)....  If I remove the watchdog 
enable line, the code runs without issue.  When I say reset, the code 
just goes to 0x0000 without warning (albiet at about the elapsed time 
after startup), 

Im using: Ethernut 2b.  ICVAVR (v6).  NutOS 3.9.5.  Code compressor on,

The reset also occurs in the AVR simulator so I dont suspect hardware!  
I believe it is a reset of sorts as the AVR simulator resets the 
stopwatch.  It appears to be in a NutDelay loop at the time although 
this changes if I alter the code - it appears to reset at a certain 
point in time.  Not using Ethernet, just uarts.  Ive placed checkpoints 
on each of the interupt vectors using the simulator and dont think other 
interupts are at fault.  I havent checked if the PC is "wrapping" from 
end of memory.

Any ideas ? (please)
Thankyou
Brett

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Brett Abbott, Managing Director, Digital Telemetry Limited
Email: Brett.Abbott at digital-telemetry.com
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