80 lines
4.2 KiB
Markdown
80 lines
4.2 KiB
Markdown
# CMDR keyboard 42 (swedish layout)
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_This HW(PCB) was original made for use with the TeensyLC module and is reused by patching it to fit the rp2040-zero module_
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## Layout
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```text
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Layer 0
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--------------------------------------- ---------------------------------------
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| Tab | Q | W | E | R | T | | Y | U | I | O | P | Å |
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| LCtrl | A | S | D | F | G | | H | J | K | L | Ö | Ä |
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| Shift | Z | X | C | V | B | | N | M | ,; | .: | -_ | Shift |
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--------------------| Alt | Fn | Spc | |Enter| Fn |AG+Fn|--------------------
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------------------- -------------------
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Layer 1 (Fn)
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--------------------------------------- ---------------------------------------
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| Esc | F1 | F2 | F3 | F4 | F5 | | F6 | F7 | F8 | F9 | F10 | BSpc |
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| LCtrl | 1! | 2"@ | 3#£ | 4¤$ | 5% | | 6& | 7/{ | 8([ | 9)] | 0=} | Enter |
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| Shift | 6& | 7/{ | 8([ | 9)] | 0=} | | <>| | ´`± | '*´ | ¨^~ | +?\ | Shift |
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--------------------| Alt | Fn | Spc | | BSpc| Fn |AG+Fn|--------------------
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------------------- -------------------
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Layer 2 (Fn + Fn)
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--------------------------------------- ---------------------------------------
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| Esc | F11 | F12 | F13 | F14 |PrSrc| | § | SLk | Gui | OSLk| CpLk| BSpc |
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| LCtrl | F15 | F16 | F17 | F18 | F19 | | Left| Down| Up |Right| Del | Enter |
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| Shift | F20 | F21 | F22 | F23 | F24 | | Home| PgD | PgU | End | Ins | Shift |
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--------------------| Alt | Fn | Spc | | BSpc| Fn |AG+Fn|--------------------
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------------------- -------------------
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```
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## Firmware features
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- 42 key split layout (36 finger keys + 6 thumb keys) with a Swedish-centric NKRO HID mapping across three layers.
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- Function layer system with two Fn keys (40/43/44) enabling sticky lock, OS lock and deep modifier combos without ghosting.
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- High-speed matrix scanning (250 µs cadence) with scan-based debounce, per-key press spacing protection and idle/suspend rate throttling.
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- Bootloader entry options including `Fn+Fn+LCtrl+LShift+RShift` runtime chord and power-on detection on button index 0.
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- Status LED heartbeat carried over from the earlier CMDR firmware: startup heartbeat, activity/idle transitions, sticky-state colors, Caps Lock flash, suspend blanking and error signalling.
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- Power-aware USB handling that drops scan frequency 20× during suspend while honouring wake-on-input and immediate resume.
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## Development workflow
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Recurring tasks are defined in the root `Justfile`:
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- Build-check the embedded target: `just check`
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- Run host-side tests: `just test`
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- Remove build artifacts: `just clean`
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- Build and copy a UF2 to a mounted RP2040: `just flash` (auto-detects `/Volumes/*`, `/media/*`, `/run/media/*`; override with `mount=/path` and optional `timeout=30` seconds)
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- Build, then transfer a UF2 over SSH: `just flash-ssh target=user@host mount=/media/user/RPI-RP2`
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The flash recipes rely on `python3`, the bundled `rp2040/uf2conv.py`, `tools/copy_uf2.py`, and `cargo objcopy` (install with `rustup component add llvm-tools-preview` and `cargo install cargo-binutils`). For SSH transfers you also need passwordless access or supply a key path, e.g. `just flash-ssh target=user@host mount=/media/user/RPI-RP2 key=~/.ssh/id_ed25519`.
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## Build environment rp2040 Zero
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Rust embedded, rp2040 HAL
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- Cargo (cargo.toml)
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- rustup target add thumbv6m-none-eabi
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- Use install script to flash device
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- Flashing via rp2040 USB bootloader
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- Pressing reset/boot button on rp2040 Zero board
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- Pressing upper left corner on the keyboard when connecting the usb cable
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- Pressing Fn+Fn+Shift+Shift+Ctrl
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## Hardware
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[Schematics](eCAD/cmdr_mainboard_42_v1.pdf)
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[patch instruction](/eCAD/rp2040_42_patch_instruction.md)
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- 1x rp2040 Zero
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- 36x Cherry MX compatible switches
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- 6x Kailh Choc low profile switches
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- 42x 1N4148 diodes
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- 1x PCB [Gerber files](eCAD/cmdr_mainboard_42_gerber_v1.zip) (please see [patch instructions](/eCAD/rp2040_42_patch_instruction.md))
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- 1x MCU cover [STL file](mCAD/cmdr_keyboard_42_cover.stl)
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- 1x 6x3 Cherry MX mounting jig (optional) [STL file](mCAD/cmdr_mounting_jig-MountingJig.stl)
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---
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