Device references for MIDI sub-devices

Device references for MIDI sub-devices

[Bill Adair]

I'm nearly at the end of the development of my serial port driver for the  
Opcode 64X and
am testing it with various applications. My current problem / question is  
- How do I
refer to the different sub-devices shown below?

linux:/home/billa # aconnect -lo
client 72: 'uart16550 MIDI #0' [type=kernel]
     0 'uart16550 MIDI #0-0'
     1 'uart16550 MIDI #0-1'
     2 'uart16550 MIDI #0-2'
     3 'uart16550 MIDI #0-3'
linux:/home/billa # amidi -l
Device    Name
hw:1,0    uart16550 MIDI #0 (4 subdevices)

Rosegarden can see them and speak to each but JSynthLib will only make  
contact
with /dev/snd/midiC1D0 which is 0 'uart16550 MIDI #0-0' or the first  
output port
on the device. Are there ways of refering to the other ports using  
/dev/snd/XXXXXX?

Bill



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Re: Device references for MIDI sub-devices

[Clemens Ladisch]

Bill Adair wrote:
> I'm nearly at the end of the development of my serial port driver
> for the Opcode 64X and am testing it with various applications. My
> current problem / question is - How do I refer to the different
> sub-devices shown below?
>
> linux:/home/billa # amidi -l
> Device    Name
> hw:1,0    uart16550 MIDI #0 (4 subdevices)
>
> JSynthLib will only make contact with /dev/snd/midiC1D0 which is 0
> 'uart16550 MIDI #0-0' or the first output port on the device. Are
> there ways of refering to the other ports using /dev/snd/XXXXXX?

The device nodes in /dev/snd/ are internal to ALSA and shouldn't be
used directly.  The ALSA device names would be "hw:1,0,0", "hw:1,0,1"
etc.

If a program doesn't support ALSA, use the OSS device file /dev/midi0x
and /dev/amidi0x.  However, the OSS emulation doesn't support
selecting subdevices.  As a workaround, load the snd-virmidi driver
and connect its ports to the device's ports.


HTH
Clemens



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