Rockbox mail archiveSubject: Re: Two-way serial comms with no internal mods...
Re: Two-way serial comms with no internal mods...
From: jobarjo <jobarjo78_at_yahoo.fr>
Date: Thu, 26 Feb 2004 10:08:07 +0100
yes the hardware is easy: you just need a voltage converter (max232) with an
open drain transistor.
The protocol must be half duplex.
----- Original Message -----
From: "Joseph Jones" <joe_at_bumpycarrot.cjb.net>
To: "Rockbox development" <rockbox_at_cool.haxx.se>
Sent: Tuesday, February 24, 2004 11:44 AM
Subject: Re: Two-way serial comms with no internal mods...
> Linus Nielsen Feltzing wrote:
> > Joseph Jones wrote:
> >> I talked about this earlier a bit...
> >> Since two-way communication is possible if we use both the line-in's
> >> pin and the in-line remote pin (man, that looks dumb written like that
> >> :) ),
> > I sure didn't understand what you meant :-)
> > Two-way communication is possible by changing the direction of the only
> > pin there is, the remote control input pin.
> >> would the system be able to talk to PC-style hardware through a serial
> >> port?
> > Yes, but not without special hardware in between, both for voltage
> > conversion and to split the Input and Output to the Rx and Tx pins of
> > the PC port. I don't know much about PC hardware, but I assume that it
> > can't change the direction of the serial port pins.
> > Also, you need to write a special protocol for the PC, as the
> > communication can only go in one direction at a time.
> > Linus
> > _______________________________________________
> > http://cool.haxx.se/mailman/listinfo/rockbox
> Right, I think I've made a mis-understanding somewhere, I'm referring
> back to this thread:
> So it's only the in-line remote pin that can do any kind of I/O. I think
> somewhere I thought that the line-in had a 4th pin on it as well :/
> So, basically, could the techniques that are used to interface with an
> Alpine CD changer also be used to talk to PC-hardware, with no internal
> mods, but allowing for external mods?
> I hope that made a bit more sense :)
Received on 2004-02-26