ChibiOS-Contrib VS yaemk-split-kb

First u/KarlK90 ported QMK, TMK and ChibiOS to GD32VF103 and used it in YAEMK.

Some of the work was upstreamed: https://github.com/ChibiOS/ChibiOS-Contrib/pull/248

Specifically for that MCU, there’s some initial support in ChibiOS-Contrib: https://github.com/ChibiOS/ChibiOS-Contrib/tree/chibios-20.3.x/os/hal/ports/LPC/LPC11Uxx

In regards to drivers for a processor or microcontroller, you may want to check out ChibiOS's HAL which provides non-blocking APIs. See here and here for an idea of what architectures are supported. I use this HAL whenever I can; it's clean and versatile in my opinion.

First u/KarlK90 ported QMK, TMK and ChibiOS to GD32VF103 and used it in YAEMK.

yaemk

The YAEMK is one I've been considering myself lately, but you've got a lot of options for split boards. You can look at and directly compare a lot of them here. If you want choc switches, without going to the sub 40% size range then the main options it looks like you have are:

There is the YAEMK

It would probably be cleaner to just put silicone stickers on a regular case like here: https://karlk90.github.io/yaemk-split-kb/

I was actually most intrigued by the Yaemk, but I think it's a too much DIY for a beginner such as I (no kits available AFAIK, has a disclaimer that it can be challenging for someone with no soldering experience).

My YAEMK supports both ARM and RISC-V MCUs. Schematics, PCB and an extensive build guide is available here -> https://karlk90.github.io/yaemk-split-kb/

Here is his YAEMK, a split, ergo keyboard that can use the same MCU, or an ARM MCU: https://karlk90.github.io/yaemk-split-kb/