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cmdr-keyboard/README.md

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CMDR keyboard 42 (swedish layout)

This HW(PCB) was original made for use with the TeensyLC module and is reused by patching it to fit the rp2040-zero module

image

Layout

 Layer 0
 ---------------------------------------      ---------------------------------------
 |  Tab  |  Q  |  W  |  E  |  R  |  T  |      |  Y  |  U  |  I  |  O  |  P  |   Å   |
 | LCtrl |  A  |  S  |  D  |  F  |  G  |      |  H  |  J  |  K  |  L  |  Ö  |   Ä   |
 | Shift |  Z  |  X  |  C  |  V  |  B  |      |  N  |  M  | ,;  | .:  | -_  | Shift |
 --------------------| Alt | Fn  | Spc |      |Enter| Fn  |AG+Fn|--------------------
                     -------------------      -------------------
 Layer 1 (Fn)
 ---------------------------------------      ---------------------------------------
 |  Esc  | F1  | F2  | F3  | F4  | F5  |      | F6  | F7  | F8  | F9  | F10 |  BSpc |
 | LCtrl | 1!  | 2"@ | 3#£ | 4¤$ | 5%  |      | 6&  | 7/{ | 8([ | 9)] | 0=} | Enter |
 | Shift | 6&  | 7/{ | 8([ | 9)] | 0=} |      | <>| | ´`± | '*´ | ¨^~ | +?\ | Shift |
 --------------------| Alt | Fn  | Spc |      | BSpc| Fn  |AG+Fn|--------------------
                     -------------------      -------------------
 Layer 2 (Fn + Fn)
 ---------------------------------------      ---------------------------------------
 |  Esc  | F11 | F12 | F13 | F14 |PrSrc|      |  §  | SLk | Gui | OSLk| CpLk|  BSpc |
 | LCtrl | F15 | F16 | F17 | F18 | F19 |      | Left| Down| Up  |Right| Del | Enter |
 | Shift | F20 | F21 | F22 | F23 | F24 |      | Home| PgD | PgU | End | Ins | Shift |
 --------------------| Alt | Fn  | Spc |      | BSpc| Fn  |AG+Fn|--------------------
                     -------------------      -------------------

Features

  • 42 keys "Split" keyboard layout. 36 finger buttons and 6 thumb buttons.
  • Extreme low profile (only one pcb).
  • Cost efficient solution with one pcb and one 3D printed cover.
  • Function layers provide three active maps (primary + two Fn layers) with sticky-lock support.
  • High-speed key scanning: 250 µs cadence with 2-scan press / 3-scan release debounce for sub-millisecond latency and immediate USB reporting.
  • Status indication driven by the joystick-style heartbeat model:
    • Heartbeat green while waiting for USB enumeration.
    • Solid green during normal operation; automatic heartbeat idle animation after 5 s inactivity.
    • Blue solid / flashing when sticky lock is armed / latched.
    • Red solid on firmware error, red flashing for Caps Lock.

Build environment rp2040 Zero

Rust embedded, rp2040 HAL

  • Cargo (cargo.toml)
    • rustup target add thumbv6m-none-eabi
    • cargo install elf2uf2-rs --locked
  • Flashing via rp2040 USB bootloader
    • Pressing reset/boot button on rp2040 Zero board
    • Pressing upper left corner on the keyboard when connecting the usb cable

Hardware

Schematics
patch instruction

CMDR keyboard 51 (only in concept phase)

image

Layout

 Layer 0
 --------------------------------------  ------     ------  --------------------------------------
 |  Tab  |  Q  |  W  |  E  |  R  |  T  || SLk |     |PrSrc||  Y  |  U  |  I  |  O  |  P  |   Å   |
 | LCtrl |  A  |  S  |  D  |  F  |  G  ||  M2 |     |  M5 ||  H  |  J  |  K  |  L  |  Ö  |   Ä   |
 | Shift |  Z  |  X  |  C  |  V  |  B  ||  M3 |-----|  M6 ||  N  |  M  | ,;  | .:  | -_  | Shift |
 --------------------| Alt | Fn  | Spc || BSpc| Gui |Enter|| Spc | Fn  |AG+Fn|--------------------
                     ------------------  -----------------  ------------------
 Layer 1 (Fn)
 --------------------------------------  ------     ------  --------------------------------------
 |  Esc  | F1  | F2  | F3  | F4  | F5  ||  M1 |     |  M4 || F6  | F7  | F8  | F9  | F10 | BSpc  |
 | LCtrl | 1!  | 2"@ | 3#£ | 4¤$ | 5%  ||  M2 |     |  M5 || 6&  | 7/{ | 8([ | 9)] | 0=} | Enter |
 | Shift | 6&  | 7/{ | 8([ | 9)] | 0=} ||  M3 |-----|  M6 || <>| | ´`± | '*´ | ¨^~ | +?\ | Shift |
 --------------------| Alt | Fn  | Spc || BSpc| Gui |Enter|| Spc | Fn  |AG+Fn|--------------------
                     ------------------  -----------------  ------------------
 Layer 2 (Fn + Fn)
 --------------------------------------  ------     ------  --------------------------------------
 |  Esc  | F11 | F12 | F13 | F14 |     ||  M1 |     |  M4 ||  §  | SLk |     |     | CpLk| BSpc  |
 | LCtrl | F15 | F16 | F17 | F18 | F19 ||  M2 |     |  M5 || Left| Down| Up  |Right| Del | Enter |
 | Shift | F20 | F21 | F22 | F23 | F24 ||  M3 |-----|  M6 || Home| PgD | PgU | End | Ins | Shift |
 --------------------| Alt | Fn  | Spc || BSpc| Gui |Enter|| Spc | Fn  |AG+Fn|--------------------
                     ------------------  -----------------  ------------------

Features

  • 51 keys "Split" keyboard layout. 36 finger buttons, 9 thumb buttons and 6 function buttons.
  • Extreme low profile (only one pcb).
  • Cost efficient solution with one pcb and one 3D printed cover.
  • Function layers with the same immediate-report, low-latency scanning pipeline as the 42-key variant (primary + two Fn layers with sticky lock).
  • Status LED behaviour mirrors the joystick/42-key firmware: heartbeat during boot, idle animation after 5 s inactivity, blue indicators for sticky lock, and red for caps/error conditions.

Build environment rp2040 Zero

Rust embedded, rp2040 HAL

  • Cargo (cargo.toml)
    • rustup target add thumbv6m-none-eabi
    • cargo install elf2uf2-rs --locked
  • Flashing via rp2040 USB bootloader
    • Pressing reset/boot button on rp2040 Zero board
    • Pressing upper left corner on the keyboard when connecting the usb cable

Hardware

Schematics

  • 1x rp2040 Zero
  • 45x Cherry MX compatible switches
  • 6x Kailh Choc low profile switches
  • 51x 1N4148 diodes
  • 1x PCB Gerber files
  • 1x MCU cover (TBD)
  • 1x 6x3 Cherry MX mounting jig (optional) STL file