Lpc2000

--- Robert Adsett
<subscriptions@...> wrote:
> At 05:00 PM 4/12/04 -0700, you wrote:
> >Has anyone been successful in using the LPC2106
> with a
> >WIGGLER using OcdLibRemote?
> 
> I have, although it sometimes takes me a couple of
> tries to connect 
> successfully.  Usually if I'm having a real problem
> connecting it's because 
> I either didn't set dbgsel correctly for I forgot to
> plug the cable into 
> the printer port :)
> 
> Robert
> 
> 
> " 'Freedom' has no meaning of itself.  There are
> always restrictions,
> be they legal, genetic, or physical.  If you don't
> believe me, try to
> chew a radio signal. "
> 
>                          Kelvin Throop, III
> 
> 
Thanks Robert --- at least I know that it can work
like that.

One other tidbit I learned along the way ... even with
the target not being powered up, the Wiggler interface
provides a weak power source to the target via the LPT
cable, guess trough leakage along pullups etc. This
weak power source is enough to get the LPC2106 locked
up in a bad state -- it is doubtful whether it will
never get into debug state like that. 

The solution is to be careful about the order you
power up and connect things up. Start out by having
the Wiggler disconnected from the LPT cable, then
connect up the target. Next power up the target to
supply power to the Wiggler, and finally connect the
LPT cable. This way the LPC2106 is in a good state and
ready for the JTAG-debug session.

Johan Forrer