Lpc2000

Hi,

need someone to discuss this problem with:

I have a board based on a 2138 where I have P0.20 connected as an input 
to read a button.

When I was debugging this app. I noticed that I sometimes get false 
triggers of the button. I hooked up the scope but it did not check any 
activity on the pin.

Deduced that this must be a configuration problem and checked that the 
pin was set as an input ( It was ) and that the PINSEL1 had P0.20 as a 
GPIO (and it was).

I then just set up a loop that read the pin and write out a '1' or a '0' 
on one of the serial channels showing its state and what I see is a 
perfect 50% duty cycle waveform is present on the pin. The scope on the 
same pin does not show anything.

How can this be possible. Suggestions welcome.

Regards
/Ake

-- 
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergavägen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se      
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org