Скачать или смотреть Grazer Linuxtage 2023 - Pointless Blinking With Python, asyncio, and libgpiod (and a Raspberry Pi...

One of my more pointless projects is to blink a configurable set of
programmable patterns on a number of LEDs. This might sound like "hey,
you are reinventing the wheel". I admit I do - I am a notorious
reinventer, and it is fun.

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[Livehacking screenplay](https://www.faschingbauer.me/about/si...)
[Proposal text](https://www.faschingbauer.me/about/si...)
[Installation notes](https://www.faschingbauer.me/about/si...)

Lets reinvent LED blinking in a live-hacking session, and look into a
number of topics as we go:

Python is a programming language that most of you know. It is simple
and expressive, thus *fun*.
Python's ``asyncio`` is a parallel programming technique, similar to
multithreading in its usage, but fundamentally different in every
other respect. At its core, it maps multiple parallel control flows
onto one single-threaded event loop. Given that timers are events,
this gives us the possiblity to run multiple LED blinking programs
in one single thread - saving all the context switching and
scheduling overhead that multithreaded programs usually
exhibit. Blinking with less glitches caused by context switch hiccups!
Ah, blinking patterns. Know what Python decorators are? Closures?
We'll twist our brains and create a ``@program`` decorator,
implemented as a double-closure, and use that to write a number of
amazingly simple blinking programs. Almost like functional
programming.
Last not least, ``libgpiod``. The way to go for GPIO on Linux.

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Jörg Faschingbauer

https:/pretalx.linuxtage.at/glt23/talk/LKZYPX/