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Re: [avr-gcc-list] JTAG ICE Problem (Off Topic)

From: Theodore A. Roth
Subject: Re: [avr-gcc-list] JTAG ICE Problem (Off Topic)
Date: Mon, 18 Aug 2003 12:30:36 -0700 (PDT)

On Mon, 18 Aug 2003, James Dabbs wrote:

> This has turned out not to be a GDB problem, but I had a note ready to go..
> I am having trouble with our JTAG ICE.  We are using it with our board,
> based on a 16MHz ATMega169.  Basically, the ICE "looses touch" with the AVR.
> When I break, if I look at registers or examine breakpoints, the application
> code just continues running and all of the variables and registers shown in
> the debugger appear as 0xFF.  The software runs *properly* in this state,
> just without any connection to the debugger, which has to be restarted to
> regain control.  This happens with an assembler project under AVRStudio
> 4.07.  If I move quickly, I can step through code, but as soon as I pause
> for more than a couple of seconds, the application code starts running and
> leaves the ICE behind.  The ICE connection has been verified, the voltage is
> within 2% of 5V, and the oscillator is 16.0000MHz.  I believe this is either
> an electrical problem with our board (although it is an infuriatingly simple
> PCB) or possibly a problem with 16MHz parts.  Has any one had similar
> troubles?

Ouch! That sucks.

Have your tried running the same (or as nearly the same as possible)
code on either the butterfly or the stk502? That might help you
eliminate if it is you board or not.

Ted Roth

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