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[Keyboard] Add mini42 (#18491)

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Co-authored-by: kevinmgee <kevingee@kevingee.biz>
Co-authored-by: Drashna Jaelre <drashna@live.com>
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# mini42
![mini42](https://i.imgur.com/xrSKhqRh.png)
![mini42PCB](https://i.imgur.com/R7u1KB8h.png)
*A pre-built, low profile, split mechanical keyboard based on the RP2040 processor*
* Keyboard Maintainer: [Kevin Gee](https://github.com/controller-works)
* Hardware Supported: *mini42 split ergonomic keyboard*
* Hardware Availability: *https://controller.works/products/mini42-low-profile-ergonomic-keyboard* Hardware is available as pre-built units only.
Make example for this keyboard (after setting up your build environment):
```sh
make controllerworks/mini42:default
```
Flashing example for this keyboard:
```sh
make controllerworks/mini42:default:flash
```
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
## Features
- Highly integrated design with microcontroller, USB and TRRS connectors, and OLED all integrated on the main board with no secondary modules
- RP2040 processor by Raspberry Pi Foundation running at 130 MHz with 16MB flash memory
- CNC milled aluminum case with only 8mm thickness
- "PCB art" shine through back plate with gold surface finish
- 128x32 OLED on each keyboard half
- 42 per-key RGB LEDs and 12 backlight RGB LEDS are individually addressable
- ESD and over-current protection on USB and TRRS connectors
- Reset and boot tactile switches
- USB C host connection
- Hot swap connectors for Kailh Chocolate PG1350 switches
- Chocolate key spacing (18mm horizontal x 17mm vertical)
## Bootloader
Enter the bootloader in 3 ways:
* **Bootmagic reset**: Hold down the upper left key on the left hand keyboard half or the upper right key on the right hand keyboard half while plugging in USB
* **Physical reset button**: Press the RST button twice, rapidly
* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
## Pin Assignment
| Name | Pin | Left Row | Left Column | Right Row | **Right Column |
|--------|------|-----------|-------------|-----------|--------------|
| LED | GP0 | | | | |
| DATA | GP1 | | | | |
| DATA2* | GP28 | | | | |
| KEY0 | GP2 | 0 | 0 | 4 | 0 |
| KEY1 | GP3 | 0 | 1 | 4 | 1 |
| KEY2 | GP4 | 0 | 2 | 4 | 2 |
| KEY3 | GP5 | 0 | 3 | 4 | 3 |
| KEY4 | GP6 | 0 | 4 | 4 | 4 |
| KEY5 | GP7 | 0 | 5 | 4 | 5 |
| KEY6 | GP8 | 1 | 0 | 5 | 0 |
| KEY7 | GP9 | 1 | 1 | 5 | 1 |
| KEY8 | GP10 | 1 | 2 | 5 | 2 |
| KEY9 | GP11 | 1 | 3 | 5 | 3 |
| KEY10 | GP12 | 1 | 4 | 5 | 4 |
| KEY11 | GP13 | 1 | 5 | 5 | 5 |
| KEY12 | GP14 | 2 | 0 | 6 | 0 |
| KEY13 | GP15 | 2 | 1 | 6 | 1 |
| KEY14 | GP16 | 2 | 2 | 6 | 2 |
| KEY15 | GP17 | 2 | 3 | 6 | 3 |
| KEY16 | GP18 | 2 | 4 | 6 | 4 |
| KEY17 | GP19 | 2 | 5 | 6 | 5 |
| KEY18 | GP20 | 3 | 0 | 7 | 0 |
| KEY19 | GP21 | 3 | 1 | 7 | 1 |
| KEY20 | GP22 | 3 | 2 | 7 | 2 |
| SDA | GP24 | | | | |
| SCL | GP25 | | | | |
\*DATA2 on production units, not connected on prototype units
\** Right Column numbers run right (pinky position) to left (thumb position)