What I've done in the past to remedy a similar situation was to use the
[aconnect] object, queried its ports and compared its output to a symbol
like [symbol LaunchKey( or something like that. When the comparison went
through I stored the number. I did the same for Pd and used those stored
numbers to make the connection through [aconnect]. Don't the patch at
hand right now, but this is the overall idea.
On 10/3/25 16:10, michael strohmann wrote:
Ok, yes I also suspect the os rather than pd…
Its unfortunately difficult to debug, since during development I did
not have the problem,
and now that the raspi and teensy are packed in a box …
The classic Heisenbug, or even Mandelbug situation:-)
I will try to come up with the “script to check if device is here,
otherwise restart” idea…if someone could point me to a starting point
I’d appreciate it. I’m not very steeped linux scripts….
On 03.10.2025, at 14:46, Andrew Lyons <[email protected]> wrote:
I am going to guess that its not pd that doesn't recognize the midi
device, but alsa. I have the same problem with an older pi4 I use for
a pd synth. I've spent quite a bit of time trying to work out why
alsa doesn't see the hifiberry card on boot without coming up with a
reliable solution. It's a problem that probably needs to be elevated
to those developing the operating system, and perhaps alsa
specifically. In the meantime, a reboot is the only workaround I've
come up with.
Best
============================================================
Andrew D Lyons | Tools Developer |
https://www.sites.google.com/site/tstexture
============================================================
On Fri, Oct 3, 2025, 1:47 AM michael strohmann
<[email protected]> wrote:
Hi!
A bit off topic since probably more related to operating system:
I am running PD on a raspi5 / bookworm with a teensy as MIDI
device input.
In some cases pd does not recognise the MIDI device after a restart.
Is there a way to start pd only when the system recognized the
MIDI device ?
Thanks!
Michael
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