Here is how I would go about it:

Use CM2:CM0 == 0b011

Then:

RA0 and RA1 are your potentiometer inputs

RA2 is your reference, driven by the VREF module (VROE == 1)

RB1 and RB2 are your USART pins

That leaves 9 pins for multiplexing your keyboard.

No need to configure/reconfigure at all.

Bob Ammerman
RAm Systems


 // TODO: Add your command handler code here
----- Original Message -----
From: "Goring, Steve" <Steve.Goring@BSKYB.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, April 23, 2002 3:48 AM
Subject: [PIC]:16f628 comparators


> Hi List ...
>
> This is my requirement - use a gameboy / playstation hand controller for
> controlling 4 lights
> 5 dc motors and 2 pan and tilt cameras.
>
> On the hand controller are 2 analogue pots and 17 switches - my options
are
> this, keyscan
> the switches in a 4x4 matrix and use discrete comparators and just read
the
> o/ps.
>
> keyscan the switches and use the internal comparators.
>
> My question is this - I need the usart to connect to the motors etc via
> rs232, there fore to keyscan
> the switches I need 8 i/o lines - would it be better to use all of portb
> where the usart is located
> and keep configuring and unconfiguring it or to use the upper 4 bits of
> portb and lower 4 bits of
> porta where the comparators are located and keep configuring and
> unconfiguring the comparators.
>
> Or is there another way of doing things - I hope this is clear enough. In
> summary I need to know the
> state of two analogue pots and 16 switches, the resultant states are then
> changed into control
> codes and sent to the hardware via rs232.
>
> Thanks in advance
>
>
> Steve
>
>
>
>
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