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Rockbox mail archiveSubject: Re: ANNOUNCE: Rockbox emulates M-Bus car CD changer (Alpine and OEM)Re: ANNOUNCE: Rockbox emulates M-Bus car CD changer (Alpine and OEM)
From: [IDC]Dragon <idc-dragon_at_gmx.de>
Date: Fri, 13 Feb 2004 18:58:51 +0100 (MET) > For the sony s-link it uses variable length pulses: > > http://www.undeadscientist.com/slink/encoding.html > > might still be possible to hack with the uart. But the BIG problem is that > there is an uncertainty on the last bit value for each byte received. So > it does not seems easily feasible. You could use the UART at high baudrate to just find the falling edges (getting a framing error a byte time after it) and use that for your decoding. > Is it possible to program a 600us timer interrupt to sample the pin after > the first falling edge? Yes, you can do that. A general thing: most CD changer protocols require more than one line for their communication. A naked Archos (without external uC addon) can't handle that. I was "lucky" that Alpine uses only one pin (bidirectionally), and that the levels are OK. Jörg -- GMX ProMail (250 MB Mailbox, 50 FreeSMS, Virenschutz, 2,99 EUR/Monat...) jetzt 3 Monate GRATIS + 3x DER SPIEGEL +++ http://www.gmx.net/derspiegel +++ _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockboxReceived on 2004-02-13 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |