lufa VS qmk_firmware

* QMK Toolbox 0.2.2 (https://qmk.fm/toolbox)* Supported bootloaders:* - ARM DFU (APM32, Kiibohd, STM32, STM32duino) via dfu-util (http://dfu-util.sourceforge.net/)* - Atmel/LUFA/QMK DFU via dfu-programmer (http://dfu-programmer.github.io/)* - Atmel SAM-BA (Massdrop) via Massdrop Loader (https://github.com/massdrop/mdloader)* - BootloadHID (Atmel, PS2AVRGB) via bootloadHID (https://www.obdev.at/products/vusb/bootloadhid.html)* - Caterina (Arduino, Pro Micro) via avrdude (http://nongnu.org/avrdude/)* - HalfKay (Teensy, Ergodox EZ) via Teensy Loader (https://pjrc.com/teensy/loader_cli.html)* - LUFA/QMK HID via hid_bootloader_cli (https://github.com/abcminiuser/lufa)* - LUFA Mass Storage* Supported ISP flashers:* - AVRISP (Arduino ISP)* - USBasp (AVR ISP)* - USBTiny (AVR Pocket)* Auto-flash enabled* Auto-flash disabled* Auto-flash enabledUSB device disconnected (CH341SER_A64): wch.cn USB-SERIAL CH340 (COM15) (1A86:7523:0264)USB device connected (CH341SER_A64): wch.cn USB-SERIAL CH340 (COM15) (1A86:7523:0264)

I briefly checked its code - wrapping it for reasonably convenient use with Arduino IDE would be not that simple. USB is quite abstract protocol and a particular device type requires a matching handler code. You can find example for keyboard HID here: https://github.com/abcminiuser/lufa/tree/master/Demos/Device/ClassDriver/Keyboard - as you can see, there is not so small amount of code for handling it: even though all really hard work is done inside the library, you still need to make a lot of proper calls to make it work.

For AVR devices I've always liked LUFA because it has tons of examples to get you started and works great even on low-end devices like the AT90USB162 (16MHz 8-bit cpu with 512 bytes of SRAM).

I only use keyboards running QMK or ZMK, so:

My Caps Lock key is a Control/Escape key (when tapped it behave like a Escape, when hold it's Control), and my left Control is a one shot layer switch key [1], which means I tap LCtrl once, and then press Caps Lock + 5 to get Ctrl+F5. Doable with single hand and more ergonomic as I have an unusually small hand.

[1] https://github.com/qmk/qmk_firmware/blob/master/docs/one_sho...

I agree that reduced finger movement is a crucial step in achieving typing efficiency. This is nicely solved by mod tap modifiers in QMK/ZMK[1] where key acts as a char when tapped and as a layer while pressed.

[1]: https://github.com/qmk/qmk_firmware/blob/master/docs/mod_tap...

Separate wireless controller, see the glue code at [0]

[0]: https://github.com/qmk/qmk_firmware/compare/master...nuphy-s...

If you have a keyboard that runs QMK firmware[0] with the VIA[1] feature enabled[2], then there is a convenient testing app available from the same place you customize your keys [3].

[0] https://qmk.fm/

I made a layout that I'm happy with. Spanish is my native language, so it has characters like the accents and 'ñ', but it's meant to be used for programming as well. Visual Studio uses a lot of Ctrl and Ctrl + Shift shortcuts, so I left them in the same place as the default Corne layout so I can press them both with my pinkie finger. Perhaps some of the ideas are useful to you.

Also, it would be possible to do this for the RP2040. However, it needs some work to get working. but for example: https://github.com/qmk/qmk_firmware/pull/20999

Ok, it's an ST7735, not too different from the ST7789. You should be able to get running by looking at their files in the QMK repo and going from there. You should also check their resources page.