Driving an LED matrix using async embedded Rust - moxi Ep2

In part 2 of our air quality monitor project, we're revisiting the microbit's LED matrix one last time, with the goal of displaying CO2 concentration in two different ways. I wanted to call this one "The Matrix Reloaded", but Ferris talked me down...

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Chapters
0:00 Intro
0:34 The Hardware
2:14 The BSP
6:45 The Helpers
11:00 The Level
14:10 (Clearing) The Air

Special thanks to `word` and `long` Patreon supporters!
- Gaël Giraud
- Χάρης Αμαράντηγος
- Jason Whitlark
- Bogdan

Project stuff
Today's code | https://github.com/therustybits/moxi
Part 1 | https://youtu.be/vT4-bvHCbE0

Useful stuff
Aranet4 | https://amzn.to/4mrXktk
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References
microbit schematic | https://github.com/microbit-foundation/microbit-v2-hardware
The Embedded Rust book | https://docs.rust-embedded.org/book/
"The Book" | https://doc.rust-lang.org/book/index.html