AVR-Chat

At 08:03 PM 3/14/2005, Russell Shaw wrote:

>Dave VanHorn wrote:
> >
> >>Of course there is a certain person lurking in the background in this
> >>forum that LOVES his JTAG ICE and Studio4.....
> >
> >
> > I love mine when it works.
> >
> > When it actually talks to studio through any sort of serial port.
> > When it actually loads the chip.
> > When it doesn't skip instructions in single-step.
> > When it doesn't invent breakpoints that don't exist.
> > and the list goes on...
>
>If you're using jtag-ice mk-I, do *not* use a fast baud rate like 115k,
>because the mk-I protocol has absolutely *no* error checking. It might
>be true of other earlier tools too. Using longer serial cables and going
>thru switch-boxes will exacerbate this.

Hmm.. I have pretty much always used 1152, but wasn't aware of the lack of 
error checking.
Still, I would think that on a 6' cable, the error rate should be zero.

Today I've tried various combinations of three computers, two running XP, 
and one running 98.
Olimex and Atmel Jtag ICEs
AVRISP, and STK-500.
Different serial cables, different serial ports, USB and legacy.
Different target systems.
Different target power supplies.