What about complementing the pin in question with the normally closed
contacts.  This would change them from
Reading low to reading high.  

	
Regards,

	
Jim



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Andre Abelian
Sent: Monday, December 04, 2006 5:03 PM
To: Microcontroller discussion list - Public.
Subject: [pic]: keypad routine

Hi to all engineers,

I am working on a project that has 5x5 keypad is used.
Just today I realized that 4 of it's keys are normally closed and also
5th column is connected to RC2 and the rest to RD port (col) and RB0 is
connected to 5th Row and the rest of port D (Row).
The way I was using keypad scan was assumed every thing was connected to
same port. Those normally closed keys are kind of confusing me because
when key is not pressed it will return 0 but in this case I can't take 0
as key pressed.
any recommendation or method should I use any routine in c will
appreciate.

I use 18f4550 with ccs c compiler.


Andre   

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