Multiple MIDI in ports with libpd

jeppius

Cool thanks, I'll test it with the dev branch as soon as possible. I actually have a powered USB hub but I was powering the Bela just from the host computer, I'll try with the 5v power adaptor attached as well.

giuliomoro

Oh. Well if your USB hub is powered, then there should be no need for a 5V power supply for Bela.

Let me know if this happens again with the newest version.

jeppius

I think I may have a problem with the usb hub then, it works fine with a single controler, but it does not work with one or two controllers through the hub, even if it works fine on my mbp. I will replace it and test it again.

giuliomoro

Oh, that's unfortunate. I tried with two different passive ones and - when the board is powered through the barrel cable - I get a MIDI keyboard, a MIDI synth and a WIFI dongle all powered through the hub and working no probs.

Is this happening with the latest version of the software on the dev branch ?

jeppius

Yes. Both interfaces work if directly plugged, but they do not work through the hub. I will get a hopefully "more" linux compatible hub...

giuliomoro

Actually, jeppius , you just can't do this from the IDE: after you issue the first command from the console, you will not be able to kill it from the console, actually anything you'll type into the console is going to be ignored!

So you will indeed need to open a proper terminal, then ssh into the board:

ssh root@192.168.7.2

and then run one after the other the commands above, using ctrl-c to kill the current one before the next one.

giuliomoro

jeppius have you had a chance of test this ?

in a terminal:

amidi -d -p hw:0,0,0
amidi -d -p hw:0,0,1
amidi -d -p hw:1,0,0

giuliomoro

Just to check whether it is something wrong with the code I wrote or with your hardware, could you please try each of these in a terminal:

amidi -d -p hw:0,0,0
amidi -d -p hw:0,0,1
amidi -d -p hw:1,0,0

Between each of those press some keys/buttons on the corresponding device and see if those values are dumped to the screen.
NOTES:

there should be no Bela program running in the background while doing this
if you are running these from the console within the IDE, you will need to type killall midi to kill the running process before you run the next one
if you are running them from a proper terminal, you will kill them with ctrl-C

jeppius

Hi, just got a new 4-port usb hub from D-link. This one seems to work ok,

ls /dev/midi*
/dev/midi
/dev/midi1

find /dev/snd
/dev/snd
/dev/snd/by-path
/dev/snd/by-path/platform-musb-hdrc.1.auto-usb-0:1.4:1.0
/dev/snd/by-path/platform-musb-hdrc.1.auto-usb-0:1.2:1.0
/dev/snd/by-id
/dev/snd/by-id/usb-KORG_INC._nanoKONTROL2-00
/dev/snd/by-id/usb-1a86_USB2.0-MIDI-00
/dev/snd/controlC0
/dev/snd/midiC0D0
/dev/snd/controlC1
/dev/snd/midiC1D0
/dev/snd/seq
/dev/snd/timer

amidi -l
Dir Device Name
IO hw:0,0,0 nanoKONTROL2 MIDI 1
IO hw:1,0,0 USB2.0-MIDI MIDI 1
O hw:1,0,1 USB2.0-MIDI MIDI 2

So, the device numbers changed, I updated default_libpd_render.cpp and it seems to work fine now.
However this is the output of your last commands...

amidi -d -p hw:0,0,0
ALSA lib rawmidi_hw.c:233:(snd_rawmidi_hw_open) 
open /dev/snd/midiC0D0 failed: Device or resource busy
cannot open port "hw:0,0,0": Device or resource busy

root@bela ~/Bela/IDE# amidi -d -p hw:1,0,0
ALSA lib rawmidi_hw.c:233:(snd_rawmidi_hw_open) 
open /dev/snd/midiC1D0 failed: Device or resource busy
cannot open port "hw:1,0,0": Device or resource busy

root@bela ~/Bela/IDE# amidi -d -p hw:1,0,1
ALSA lib rawmidi_hw.c:233:(snd_rawmidi_hw_open) 
open /dev/snd/midiC1D0 failed: No such device
cannot open port "hw:1,0,1": No such device

giuliomoro

Great news (sort of, as it would be better if all USB hubs worked fine. Could you please post the model/maker of the one that was NOT working?)

I believe your last three commands failed because you were running the Bela program in the background? Once that takes possession of the ports, amidi would fail trying to open them.
If you have time, could you try the same amidi commands with the OLD usb hub?

jeppius

Sorry for the delay again, I will test it in the next couple of days.

giuliomoro

no hurry, thanks

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