From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bill Adair" Subject: Re: New driver for Opcode 64X Serial MIDI interfaces Date: Mon, 07 Mar 2005 11:07:02 -0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; format=flowed; delsp=yes; charset=utf-8 Content-Transfer-Encoding: quoted-printable In-Reply-To: Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Clemens Ladisch , "alsa-devel@lists.sourceforge.net" List-Id: alsa-devel@alsa-project.org On Fri, 25 Feb 2005 14:12:17 +0100 (MET), Clemens Ladisch =20 wrote: > Bill Adair wrote: >> Do you want me to (a) provide a replacement file for >> serial-u16550.c, (b) provide a version of serial-u16550.c with >> comment documentation in but no Opcode driver and a seperate >> Opcode driver file, or (c) provide just a comment documented >> Opcode driver and leave serial-u16650.c alone? > > If the Opcode is similar enough to other serial devices (BTW: what are > the differences?), there's no reason to put it into a separate file. > > Please submit one patch for each logically independent change. > > > Regards, > Clemens > The Opcode device is similar to the others in that it uses F5 for channel= =20 changing. The major differences are it's relative modernity and therefore throughpu= t =20 speed (the device runs at 115200 baud), the sign on sequence demanded by the interface before allowing any midi traffic, a sign off sequence required = =20 at the end of use, and the signalling required to prevent midi traffic choking. Ever= y =20 four bytes sent to the interface the computer must wait for a _toggle_ of CTS (there= =20 is nothing like this in the current drivers) and every 16 bytes sent to the pc the =20 interface waits for a _toggle_ of RTS. The device can also be indentified as being on the seria= l =20 port which the driver does (instaed of just checking for a UART chip). Bill ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click