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Subject: Re: ANNOUNCE: Rockbox emulates M-Bus car CD changer (Alpine and OEM)
From: jobarjo (jobarjo78_at_yahoo.fr)
Date: 2004-02-14


arrrrrrgh

s-link is not for car audio cd changer. It is for home
products only.

car radios use a protocol called unilink which needs 2
or 3 pins:
- a clock
- a bidir data
- a reset signal (optional?)

http://www.mictronics.de/unilink_resource.php
might still be possible to connect through the line in
connector (for the player)

bit period is 20us. dont know if the software can
manage it. The serial clock 1 in the archos is used
for I2C isn't it?

one other solution is to have a microcontroller
interfacing: only low level byte conversion from
synchronous to remote pin. There should be no
additional component around the pic (except power
supply and maybe a quartz) There is a gpl design on
the net doing the interface:
http://gnunilink.sourceforge.net/

Too bad, I found a sony head changer at 105 euros.

If someone is interrested in other changer protocols:
http://www.mictronics.de/?page=cdc_proto

blaupunkt uses a simple async full duplex serial
commuication. still needs another pin.

 --- bio man <jobarjo78_at_yahoo.fr> a écrit : > > A
general thing: most CD changer protocols require
> > more than one line for
> > their communication...
>
> s-link is simply direct compatible...
> 5v open drain bidir pulses.
>
> http://www.undeadscientist.com/slink/index.html
>
>
>
>
>
>
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