[wdmaudiodev] [wdmaudiodev]Sysex and multiprocessor troubles

  • From: "kevin molcard" <kev2041@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Thu, 12 Jul 2007 17:04:24 +0200

Hello everybody,
for my first post on this list, I have a question about Sysex.

I work on an USB Audio device and I want to send a lot of SysEx from it to a
computer. It works fine on Mac OSX and on Windows computer which have single
processor. But when I use a multiprocessor computer, some sysex are
The symptom is: it cut a part(near to 20 bytes) of one sysex (between 0xF0
and 0xF7) and put it at the beginnig of the next one (before 0xF0). I looked
at the data with an USB analyseur and all is ok on the bus. So it seems to
be a problem with the USB driver.
I have to precise that it happens also on single processor with
hyperthreading. I guess it is a thread synchronisation proplem but I still
don't find where it is.
Does anyone have such kind of problem with the Windows default driver?


Other related posts:

  • » [wdmaudiodev] [wdmaudiodev]Sysex and multiprocessor troubles