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Subject: Re: External Serial LCD Display / Keypad
From: sophana (jobarjo78_at_yahoo.fr)
Date: 2004-08-06


Andy Finney wrote:

>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?
>
>
you will have to open your archos and do the serial mod. then you'll
have full duplex serial lines. (ttl level)
The pins are quite accessible and you can get them out easily through
the line in connector (if you have a studio)

If you don't want to open it you'll need a micro controller.
Or if you don't want to use the keypad, you might be able to transmit
only with the remote pin.

>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?
>
>
>
I had a look at your url. The display controller does support TTL
communication, by modifying jumpers.
so you dont'need any max232.
You should use a 10k serial resistor for not damaging the 3v input of
the archos.

>Thanks in advance,
>
>Andy.
>
>
>
>
>
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>

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