Slide Material: Python, asyncio, libgpiod, and Pointless Blinking

blink

• Source code: https://github.com/jfasch/blink

• Talk’s livehacking outcome: https://github.com/jfasch/blink/tree/main/glt2024/final

gpiod

• C interface (at the heart of it), C++ binding: https://libgpiod.readthedocs.io/en/latest/modules.html

• PyPI: https://pypi.org/project/gpiod/

• Kernel documentation: https://www.kernel.org/doc/Documentation/gpio/

• Python binding

  $ git clone https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
  $ ls -1 libgpiod/bindings/python/examples/
  async_watch_line_value.py
  find_line_by_name.py
  get_chip_info.py
  get_line_info.py
  get_line_value.py
  get_multiple_line_values.py
  Makefile.am
  reconfigure_input_to_output.py
  toggle_line_value.py
  toggle_multiple_line_values.py
  watch_line_info.py
  watch_line_rising.py
  watch_line_value.py
  watch_multiple_line_values.py
  

asyncio

• asyncio — Asynchronous I/O

• Yury Selivanov - async/await in Python 3.5 and why it is awesome

• David Beazley - Build Your Own Async

Textual

• Homepage, Documentation: https://textual.textualize.io/

• Source code: https://github.com/textualize/textual/

Python SDbus

• Documentation: https://python-sdbus.readthedocs.io/en/latest/

• Source code: https://github.com/python-sdbus

• Lennart Pöttering about SDbus, recommended reading: https://0pointer.net/blog/the-new-sd-bus-api-of-systemd.html

• DBus specification: https://www.freedesktop.org/wiki/Software/dbus/

Python 3.12 Installation (for TaskGroup)

$ sudo apt install libssl-dev libreadline-dev libffi-dev libsystemd-dev python3-dev
$ wget https://www.python.org/ftp/python/3.12.2/Python-3.12.2.tar.xz
$ tar xf Python-3.12.2.tar.xz
$ cd Python-3.12.2/
$ ./configure --prefix=$HOME/Python-3.12.2-Install --with-readline
$ make
$ make install