Lpc2000

Uwe & Nick,

I have the same experience as Uwe. I would check the TX line on the 
low level side of the ST3232(pin 11). Other than that you could 
perhaps try a JTAG interface before throwing the poor board away.

Anders  


--- In lpc2000@yahoogroups.com, "nma550n" <nma550n@...> wrote:
>
> uwe,
> 
> Thanks man, that has helped alot. Will check it out later.
> 
> Nick
> 
> --- In lpc2000@yahoogroups.com, "Uwe Arends" <nospam@> wrote:
> >
> > Nick,
> > 
> > > Can anyone confirm the voltage present on Tx.
> > 
> > out of reset, the TX pin is at 'low' level on my board
> > with the BSL jumper installed. 
> > If I then issue a "read device id" command from within
> > the LPC200 flash utility, theres some traffic on the line
> > and the utility reports the part id read successfully.
> > TX is high afterwards.
> > If I then reset the board again, TX goes back to low
> > and the next "Read device ID" fails, leaving TX in high
> > state.
> > The next "Read device ID" then is again successful, even
> > if ignoring the request to reset the board.
> > 
> > So, if your TX stays low, no matter what you do, I guess
> > you have a faulty board, either controller damaged, line
> > shortened or transceiver damaged.
> > I'd inspect the soldering to see if there are some shorts,
> > especially the "expansion" connector, that carries TXD0
> > next to GND.
> > 
> > hth
> > -uwe
> >
>