RE: [avr-gcc-list] Jtag ice

[Steve @ Franks Development, LLC]

> Was your project using the watchdog reset? That kinda makes 
> it tough to do ICE debugging when the watchdog reset's the system.

No watchdog; As I mentioned, it *only* happens when the jtagice dongle is
plugged in.  Unplug it, the program executes normally.

> I've seen my systems mysteriously reset quite often. Every 
> time it's been because of a bad pointer in my code.

No pointers (this is a good tip to remember though); just a PORTA = blah
statement...

Thanks,
Steve

Steve Franks
Staff Engineer & General Manager
Franks Development, LLC
(520) 312-0089 voice
(360) 368-8006 fax
http://www.franks-development.com 


 

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On Behalf Of Theodore A. Roth
> Sent: Monday, July 12, 2004 8:15 AM
> Cc: AVR GCC List
> Subject: RE: [avr-gcc-list] Jtag ice
> 
> On Sun, 11 Jul 2004, James Dabbs wrote:
> 
> > > Anyone have problems with the jtagice and the avr butterfly board?
> > With jtag ice
> > > plugged in (either in debug or run) about 6 lines of the program
> > execute (down to
> > > an PORTB=, I think), then the device resets; if I unplug jtagice,
> > everything
> > > *appears* to work normally...
> >
> > For what it's worth..
> >
> > I used the JTAG ICE on an ATMega169 board (our own board) and never 
> > could get it working.  I could single-step through code AS 
> LONG AS I 
> > NEVER PAUSED more than 5 seconds or so between lines; 
> otherwise, the 
> > part would just start executing and the ICE would lock up.  
> I diddled 
> > with termination resistors, ICE speeds, bypass capacitors, 
> versions of 
> > software, GDB, Avrstudio, IAR tools.. Nothing.  Getting the ICE 
> > working with this part was beyond my capability.  I finally got the 
> > s/w working by diddling and probing I/O lines, and finished the 
> > project 5 weeks late.  For the subsequent version, we 
> replaced the AVR 
> > with a Phillips
> > LPC2104 (ARM), and we bought a Nohau JTAG, and this worked 
> OK.  With 
> > AVR projects these days, I don't even attempt using the 
> ICE.  It's on 
> > a shelf in the lab.
> 
> Was your project using the watchdog reset? That kinda makes 
> it tough to do ICE debugging when the watchdog reset's the system.
> 
> I've seen my systems mysteriously reset quite often. Every 
> time it's been because of a bad pointer in my code.
> 
> ---
> Ted Roth
> PGP Key ID: 0x18F846E9
> Jabber ID: address@hidden
> 
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