AVR-Chat

HI Don,
I have used debug wire on a Tiny13.

It worked well enough (when I it worked) but I am a little disturbed that I 
have been locked out of a few micros when things go wrong.

FWIW here is how it worked for me
-  need to connect to regular ISP lines.
- AVRStudio is told to go into debug wire mode
- AVRStudio enter as 'special' ISP mode to set the debug wire fuse bits
- Alls well and debug wire works just like JTAG (cool)!

BUT
Before you exit you debug setting (and AVRStudio) you must remember to clear 
the debugwire fuse bit.
If you don't or AVRStudio crashes or AVRStudio reports that it could not set 
the debug wire fuse bit (as was my case) then you can get locked out of the 
micro and regular ISP no longer works nor does debug wire :-(

I don't want to appear too negative.as I have not had too much time to look 
into this as yet (and it is possible that I screwed up something).

I have been successfully developing with debug wire for a couple of week 
with no problems. Then, I need to (in a hurry) make a quick mod for a client 
and in a flurry of activity I managed to lock myself out of three devices in 
a row!!!!

I have not been able to investigate it further and it does concern me 
but )(as I said)  I was a very happy camper 'till then.
I am 'hoping' that I did something stupid in my rush.

HTH.

BTW: IF I'm not mistaken the mega 16 and the mega8 pin compatible? So you 
could use the mega16 in development (and use JTAG) and then when its all 
done recompile for a mega 8.

Cheers,

Ivan Vernot





----- Original Message ----- 
From: "Don Ingram" <don@led.com.au>
To: <AVR-Chat@yahoogroups.com>; <codevisionavr@yahoogroups.com>
Sent: Friday, March 31, 2006 10:06 AM
Subject: [AVR-Chat] Debug wire experiences


> Hi All,
>
> Does anyone have any comments re experiences with debugwire on JTAGII.
>
> I am specing a project at present which fits neatly with the Mega8 
> derivatives
> but am reluctant to leave the well trodden path with the Mega16 / JTAG 
> family.
>
> I see very little history of conversation re debugwire and have little 
> desire to
> play pioneer ( the guy lying face down in the mud with the arrows in the 
> back )
>
> X-posted to chat & codevision.
>
> Cheers
>
> Don
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>