[haiku-bugs] Re: [Haiku] #4463: Add multi-ports support to USB MIDI driver
- From: "Pete" <trac@xxxxxxxxxxxx>
- Date: Wed, 09 Feb 2011 06:50:06 -0000
#4463: Add multi-ports support to USB MIDI driver
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Reporter: Pete | Owner: nobody
Type: enhancement | Status: assigned
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/pre-alpha1
Resolution: | Keywords:
Blocked By: | Has a Patch: 1
Platform: All | Blocking:
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Comment (by Pete):
Replying to [comment:15 Pete]:
> However, the title of this ticket is still not addressed, because I can
still only process MIDI on the first of the two ports on the 2x2. I can't
find any sign of the second port, either reported by debug printouts on
the driver or from listusb!
Well it didn't take long to find out how multi-ports ''are'' handled, now
that the connection is actually working. All the packets are sent over
the ''same'' endpoints, distinguished by the first nibble in the packet.
So, as the current usb_midi simply ignores that number, you can currently
''receive'' on any port, but only ''send'' on the first.
I'll start studying the reorganization needed to handle that port ID
properly.
--
Ticket URL: <http://dev.haiku-os.org/ticket/4463#comment:16>
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