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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