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Subject: External Serial LCD Display / Keypad
From: Andy Finney (andyfinney_at_yahoo.co.uk)
Date: 2004-08-05

Hi all,

I was curious to see if anybody has tried using
Rockbox with an external LCD display...

It would be really good if I could get it working - it
has got some nice features - "General Purpose Output"
connectors to control external devices, and more
interesting - a keypad interface. This basically means
that I could control my Archos remotely with a keypad.

This is the model that I own from Matrix Orbital : -
http://www.matrixorbital.com/manuals/html/LK204-25-PC_03/index.htm

I am not scared of writing a small bit of C to
interface to the LCD. However, I have a couple of
questions...

1. The serial interface on the LCD requires 3 cables -
Transmit, Receive and Ground. I believe that there is
only one serial data line from the Archos - am I out
of luck?

2. The Archos only supplies 3v on this serial line
from what I am led to believe. Is the normal serial
voltage 5v? Will I need a small circuit to amplify
this voltage?

Thanks in advance,

Andy.

        
        
                
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