Lpc2000

Robert Adsett wrote:
> At 09:05 PM 2/19/04 +0000, you wrote:
> Alaric,
> 
> 
>>I'm fiddling with some designs for such a thing myself - I can give you
>>my Eagle files if you want; it would be a shame for our header pinouts
>>to be unnecessarily incompatible :-) My 0.1" header design brings out
>>TxD, RxD, 3.3v, 0v, /RST, and P0.14.
> 
> 
> That would be nice.  Please do.  I agree on making a consistent header.  I 
> was thinking the same set as you on a two row header with 8 pins to allow 
> for keying.  That leaves one unused pin (in addition to the keying 
> location).  The two rows allows standard ribbon cable and 8 pins is still 
> smaller than most rs232 level convertors.
> 

I was thinking (viewed from above):

3.3v          0v
/RST          RD
P0.14         TD
3.3v          0v

I'll dig out my design (it's on the other machine) and put it online 
somewhere when I get a moment. It was just a standard Maxim level 
shifter (A 3232? IIRC...), a copy of that header design (so a straight 
ribbon cable connects it to the LPC board), a 9-pin RS232 port, a button 
for reset, a switch to enable the reset line from the control lines on 
the RS232, and a three-position switch for P0.14 - RUN, PROGRAM, REMOTE 
(with the latter option connecting it to the lines from the RS232). The 
reason for all the switching (rather than just jumpers) is that, at 
least on my setup, terminal emulators annoyingly pull /RST and P0.14 
low, showing me a nice Christmas tree effect as all the GPIO lines 
connected to LEDs float high...

> Have you tried the newsgroups on Cadsoft's site? 

Ah! I'd not seen that, but knowing it was there made me see it. Duh. 
Thanks ;-)

> 
> Robert
> 

ABS