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Add split 3x5_3 keyword; clarify boot button

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Peter Cock 2025-06-25 10:06:02 +09:00 • committed by GitHub
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keyboards/tutte_coxeter_36k/readme.md
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@ -3,10 +3,10 @@
![Partial Tutte-Coxeter Graph (26/30 vertices, 36/45 edges)](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvS5QfAl7YotptMtpu0nG8XOHOsqG2vocUFF2sRgrn_QwAcUQNhDkctHt_42rQor3Bb5tbAW6FiOsYqv2craP086HMTuAqWk9U0A4yOeEsQkhyphenhyphenUxoayJWf5e-N3_Jg1TC1p9YAiVPTK02pEVCUu3hl72REIk5BAjXgZGoF7T-NWQ28iRirwFs6yzFzAe0/w200-h194/Screenshot%202025-05-28%20at%2014.59.35.png) ![Partial Tutte-Coxeter Graph (26/30 vertices, 36/45 edges)](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvS5QfAl7YotptMtpu0nG8XOHOsqG2vocUFF2sRgrn_QwAcUQNhDkctHt_42rQor3Bb5tbAW6FiOsYqv2craP086HMTuAqWk9U0A4yOeEsQkhyphenhyphenUxoayJWf5e-N3_Jg1TC1p9YAiVPTK02pEVCUu3hl72REIk5BAjXgZGoF7T-NWQ28iRirwFs6yzFzAe0/w200-h194/Screenshot%202025-05-28%20at%2014.59.35.png)
This is firmware for an Raspberry Pi Pico PR2040 controller monoblock 36 key design This is firmware for an Raspberry Pi Pico PR2040 controller monoblock 36 key design
(three rows of five, and three thumb keys, for each hand). This is a *diode-free* (split 3x5_3 - three rows of five, and three thumb keys, for each hand). This is a
design with a sparse 13 by 13 scanning matrix designed using a partial *diode-free* design with a sparse 13 by 13 scanning matrix designed using a partial
[Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph [Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph
(using only 26 vertices or GPIO pins with 36 edges or keys - see this (using only 26 vertices or GPIO pins, with 36 edges or keys - see this
[blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html) [blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html)
for background, although the final pin selection and trace routing changed). for background, although the final pin selection and trace routing changed).
@ -34,5 +34,5 @@ See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_to
Enter the bootloader in 3 ways: Enter the bootloader in 3 ways:
* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (bottom left key, Qwerty `z`) and plug in the keyboard * **Bootmagic reset**: Hold down the key at (0,0) in the matrix (bottom left key, Qwerty `z`) and plug in the keyboard
* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead * **Physical reset button**: Briefly press the button on the back of the controller (if physically accessible)
* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available * **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available