[sc-users] Further serial port question

[men_with_ties <hans@xxxxxxxxxxxx>]

Hello all; this is a follow-up to a question I posted on the DEV list some
weeks back (under heading "Serial port maximum transmission rates").
Apologies for the cross-post.

My requirement is to establish communication over a serial port, at 921600
baud, within OS X (10.4 or 10.5). This is not supported under the OS X
serial implementation that ships with SC - a result of legacy code in
TERMIOS, I believe, which tops out at 230k.

After looking further into the issue, I have spent many 'happy' hours trying
to fold the IOSSIOSPEED ioctl, poorly documented in Apple's Serial Port
Sample
(http://developer.apple.com/samplecode/SerialPortSample/listing2.html), into
PyrSerialPrim.cpp -- this seems to be my only option, OS-wise.

I have succeeded in compiling with my revised code. I don't get error
messages, but the call to IOSSIOSPEED does not actually set the output
speed; it remains stuck at 9600 baud. Which is two zeroes too few...

This is arcane territory for me and I would be very grateful if anyone more
experienced than I could suggest how to best implement it.

Full disclosure: we are currently running a Java codebase to control an
electroacoustic installation featuring 96 individually amplified, rewired
electric clocks... millisecond timing is crucial, so we need a high baud
rate. 

Thanks much.

-- Hans Samuelson
-- 
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