Watchdog Timer Failure

[jdaniel]

Posted on April 28, 2004 at 10:45

Watchdog Timer Failure

[jdaniel]

Posted on May 17, 2011 at 11:59

I've been having difficulty with the watchdog timer on the uPSD3254A in my project. Namely, I find that it somehow becomes disabled without my having written 0x55 to the WDKEY register. If I put simply a while (1) statement somewhere in my code, the watchdog does not reset the processor. If I use:

WDRST = 0xFF;

while (1);

however, the processor DOES reset. Further, if I modify the above statement to write 0x00 to the WDRST register, again the processor doesn't reset. Am I doing something wrong?

-pHaze426

[joseph2399]

Posted on May 17, 2011 at 11:59

Check your Startu32.a51 file to make sure it is not disabled there. Some people have missed this one.

[jdaniel]

Posted on May 17, 2011 at 11:59

I took a look at the startup code, and there's no write to it or it's memory address. Any other possibilities spring to mind?

[jdaniel]

Posted on May 17, 2011 at 11:59

HansDK,

At this point, I've done enough playing around that I'm willing to say ''yes'' this is a special case, whether ST intended it or not. I really hope I'm missing something and that they'll get back to me with a way to correct the problem.

-pHaze426

[joseph2399]

Posted on May 17, 2011 at 11:59

We haven't heard of this issue before but will investigate and reply.

[jdaniel]

Posted on May 17, 2011 at 11:59

uPSD,

Thanks for looking into this. Also, you might want to reference this post from September of last year which seems to be talking about the exact same behavior:

http://www.stmcu.com/forums-cat-802-11.html

-pHaze426