Xref: utzoo comp.sys.mac.programmer:19476 comp.music:2222
Newsgroups: comp.sys.mac.programmer,comp.music
Path: utzoo!utgpu!watserv1!maytag!watdragon!trillium!hmloo
From: hmloo@trillium.uwaterloo.ca ()
Subject: setting serial port's baud rate for midi
Message-ID: <1990Dec3.034829.11333@watdragon.waterloo.edu>
Keywords: midi baud mac serial
Sender: daemon@watdragon.waterloo.edu (Owner of Many System Processes)
Organization: University of Waterloo
Date: Mon, 3 Dec 90 03:48:29 GMT
Lines: 25

According to midi specifications, the baud rate the serial port should be
set to is 31.25kbaud.  How is this accomplished on the Mac?  Using the serial
driver there are predefined ones which include 1200, 2400, 9600, 52700, but
nothing near 31250.  Using the advance calls and the control function from
the device driver you can specify any integer baud rate and it should set it
to the closest possible value.  However, the control function doesn't seem
to be setting the right baud rate all.  My question is, does anyone have any
good solution to this? Hopefully a fix or pointing out what I'm going wrong.
Also is there a function that returns the value the serial port is currently
set at? Here's how the code looks like:  (it's in Think pascal, this is not an
exact buffer)   

	{ port is all initiated and set, just a matter to setting the baud
	  rate to 31250, baudrate and i are both integers}

	baudrate := 31250;
	i:= control(-6, 13, pointer(ord(@baudrate)+1));
	i:= control(-7, 13, pointer(ord(@baudrate)+1));
	writeln(i, baudrate);
	
	{ the output is no error an baudrate of 31250, but the port still
	  isn't set to 31250}

hmloo@trillium.waterloo.edu



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