[wdmaudiodev] Re: MIDI SYSEX response lost
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 23 Aug 2013 18:10:05 +0000
Does using a different USB controller have any effect?
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Timothy Knudtson
Sent: Friday, August 23, 2013 11:00 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] MIDI SYSEX response lost
Our company is working on MIDI devices that are configured using SYSEX
messages. I am seeing a weird behavior with Windows 7 and Windows 8. I send
5-10 SYSEX messages to the device and receive the expected responses, then for
the next 20-300 messages the responses do not come back. After sending those
20-300 SYSEX messages the response start coming in. I have placed a Beagle (USB
logger) on the line and setup USB logging in windows. From what I see the
responses are being sent from the device. The response size of the SYSEX
messages is less than 128 bytes (around 50 bytes on average). I have tried
using the WindowsMM libraries and the KS libraries and they both exhibit the
same behavior. My felling is that the issue lies in the USBAudio.sys driver.
This device works on Windows XP, Mac, and iOS. I have not tested on any other
platform.
Any help would be appreciated. Thank you.
Timothy Knudtson
iConnectivity
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