Lpc2000

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
>