[wdmaudiodev] Re: MIDI SYSEX response lost
- From: Timothy Knudtson <tknudtson@xxxxxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 23 Aug 2013 13:21:05 -0600
The firmware developer just produced a build that only had 1 port on the device
that had 4 port. The issue did not appear which leads me to believe that the
issue is with having multiple MIDI ports.
Timothy Knudtson
iConnectivity
On Aug 23, 2013, at 1:05 PM, Timothy Knudtson <tknudtson@xxxxxxxxxxxxxxxxx>
wrote:
> There is a single endpoint that provides multiple ports. This is a class
> compliant MIDI device.
>
> Devices with more ports do not drop earlier. But it appears that they take
> longer to recover (300 Message for 16 port device vs 64 for 4 port device).
>
> The amount of data it takes to recover varies based on device. I don't know
> the exact amount but it is between 20-300 messages of around 55 bytes each.
> It is possibly a fixed amounts of bytes but I don't know what that is.
>
> It is not a fixed time because you can close the program after sending a few
> SYSEX Messages, then wait a few minutes and restart the program and the
> responses will still not return. Once the response do return it they will
> always return until you disconnect and reconnect the USB cable.
>
> Timothy Knudtson
> Software Engineer
> iConnectivity
> 403.536.8274 | iConnectivity.com
>
>
>
>
>
> On Aug 23, 2013, at 12:45 PM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
>
>> Timothy Knudtson wrote:
>>> I don't know if this is applicable but the devices that are effected
>>> provide more than 1 MIDI port per USB Port (12, 4, and 16).
>>
>> How? Virtual cables, multiple endpoints per interface, and/or multiple
>> interfaces?
>>
>> Do devices with more ports drop data earlier?
>>
>> How long does it take until received messages come in again?
>> Might this be a fixed amount of time or a fixed amount of bytes?
>>
>>
>> Regards,
>> Clemens
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