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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: > http://rockbox.haxx.se/mail/archive/rockbox-archive-2004-02/0166.shtml > > 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 :) > > Joe > _______________________________________________ > http://cool.haxx.se/mailman/listinfo/rockbox _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-02-26 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |