[wdmaudiodev] Re: New information about multi-port USB MIDI devices
- From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 12 Nov 2013 02:58:02 +0000
By the way, when you encounter issues or problems like this, we encourage you
to open an issue via Microsoft's support channels. Customers with a Premier
contract should contact their account manager, and others can follow
instructions on http://support.microsoft.com to contact Microsoft.
While we are on the topic of the inbox USB MIDI class driver, is anyone on this
list aware of other issues (defects or functionality) in this driver that
prevent it from being more generally useful?
Regards,
Frank Yerrace
Microsoft
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tom Duffy
Sent: Friday, November 8, 2013 4:08 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: New information about multi-port USB MIDI devices
I seem to remember the problem being triggered when you split a SysEx message
into multiple packets. If you always keep the SysEx in a single call to the
MIDI subsystem, the problem doesn't occur.
Our product has up to 7 MIDI ports in a USB stream, one of
those is dedicated to SysEx control. We had to keep the
Sysex size at 512 bytes to avoid problems on XP and 7.
This was developed back in 2003/2004, so my memory of the details are a little
hazy now.
We may have been aware of the hotfix, but it's difficult to get permission to
redistribute those to end users, and besides, they are using all the different
language versions and variations that are available in the world. No way to
keep track of it.
Tom.
Matthew van Eerde wrote:
This is indeed a bug with USBAudio.sys on devices that have multiple jacks on a
single MIDI pipe. I would suggest calling Microsoft and requesting a hotfix
rather than writing a driver.
*From:*wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Timothy Knudtson
*Sent:* Friday, November 8, 2013 1:00 PM
*To:* wdmaudiodev@xxxxxxxxxxxxx
*Subject:* [wdmaudiodev] New information about multi-port USB MIDI devices
I have done some further research on the multi-port USB MIDI problem that I
have been encountering with the default USBAudio.sys driver. The driver will
accept the first few MIDI events (SYSEX Messages, notes,
etc...) then will stop working for a few more messages, then will start working
again for all messages after that.
I was able to reproduce the issue using a third party MIDI device that has
multiple MIDI ports for a single USB device. The third party MIDI controller
created their own USBAudio.sys driver to compensate for this short coming in
the default driver.
My question is what steps should I take to create my own USBAudio.sys driver?
Is there a sample driver that is recommend I start with?
Timothy Knudtson
iConnectivity
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