For the benefit of others that might come later...
1) The interaction was tighter than I previously
believed...aseqdump was
only reporting incoming data when data was actually going
out the port.
Playing a sequence that only had MIDI data at the beginning
and end of the
file resulted in a aseqdump that only produced data at the
beginning and end
of the playback, even though the data being sent to aseqdump
was a constant
stream.
That piece of information led me to re-examine the serial
ports...sure
enough, if I put the serial driver on a different port, it
worked fine.
Digging into the configuration of the non-working port, I
found that the
system was now reporting it as being on IRQ 16, not IRQ 169
as it had
previously. Not sure what changed to cause this. I changed
the options
line of the snd-serial-u16550 driver to IRQ 16, and it now
appears to work
properly.
John
>From: "r10 kindsofpeople"
<r10kindsofpeople hotmail.com>
>To: alsa-userlists.sourceforge.net
>Subject: Re: [Alsa-user] MIDI input/output interaction
w/snd-serial-u16550
>Date: Thu, 05 Apr 2007 15:30:15 -0500
>
>For what it's worth, I've isolated the problem a bit
more, and wonder if
>I'm looking at a bug in the snd-serial-u16550 driver.
>
>1) It only affects the snd-serial-u16550 driver...I
tried a USB midi
>device, and aseqdump works fine.
>
>2) It is the snd_seq_connect_to() call within aplaymidi
that works the
>magic on the already running aseqdump. Comment out the
call, and aplaymidi
>has no effect on aseqdump. Put it back in, even wth the
playfile() and
>create_queue() functions commented out, and aseqdump
works (while aplaymidi
>is running).
>
>3) The incoming data to aseqdump() is being queued
somewhere, but somehow
>aseqdump doesn't know it. That is, with aseqdump
running, if I send a
>'note on' to the input port, I see nothing, but if I
then run aplaymidi,
>then aseqdump shows the 'note on' I sent several seconds
before.
>
>John
>
>
>>From: "r10 kindsofpeople"
<r10kindsofpeoplehotmail.com>
>>To: alsa-userlists.sourceforge.net
>>Subject: [Alsa-user] MIDI input/output interaction
w/snd-serial-u16550
>>Date: Wed, 04 Apr 2007 15:52:20 -0500
>>
>>I'm seeing a strange interaction within ALSA that I
assume is due to
>>improper configuration on my part.
>>
>>I'm using alsa 1.0.14rc1 under Fedora Core 6 with
the snd-serial-u16550
>>driver, adaptor 4 (generic).
>>
>>MIDI playback works fine with programs like
aplaymidi.
>>
>>Incoming MIDI data doesn't seem to get noticed by
Alsa UNLESS aplaymidi is
>>running on another stream.
>>
>>That is, with a continuous stream of data going to
port 20:0, in one
>>terminal:
>>aseqdump -p 20:0
>>(no output)
>>
>>then, in another terminal:
>>aplaymidi -p 20:1 01.MID
>>at which point, aseqdump starts showing MIDI data
from the original stream
>>(not 01.MID) until aplaymidi finishes, at which
point output from aseqdump
>>stops.
>>
>>This behavior is repeatable...I can start aplaymidi
again, and aseqdump
>>output starts up again. I can stop the original
stream while 01.MID is
>>playing, and aseqdump output stops until I restart
the stream.
>>
>>I've tried to eliminate problems past the DB9
connector (handshaking
>>lines, etc) and as far as I can tell, everything is
working up to the
>>serial port of the PC.
>>
>>Any ideas?
>>
>>John
>>
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