Sigmar Keyboard

40% split keyboard design

PCB

The design for the PCB was done in KiCad. The PCB is designed according to the specifications of manufacturing with JLCPCB.

Firmware

Prerequisites:

• Podman
• dfu-programmer

Building:

• make docker to build the container image
• make to build the bootloader and firmware hex files

Flashing:

• make flash left or make flash right

Building and flashing in WSL

• Install Ubuntu >= 22.04
• Install usbipd-win
• sudo apt install dfu-programmer podman

Flashing:

• In Powershell

  • usbipd list
    • Find the entry that corresponds with the keyboard (when in keyboard mode, VID/PID is f055:5164)
  • Press the reset button to switch to flashing mode
    • You will need another keyboard or the on-screen virtual keyboard from now on! If the latter, it might help to type the following commands beforehand, so you only need to press enter.
  • usbipd wsl attach --busid=#-##

• In WSL

  • make flash-left or make flash-right

Flashing the bootloader with Arduino ISP

• Connect Arduino ISP
  • MOSI Pin 11 (programmer) -> B2 (target)
  • MISO Pin 12 -> B3
  • SCK Pin 13 -> B1
  • RST Pin 10 -> RST
• make build/sigmar_[osx|windows]_bootloader.hex
• avrdude -p atmega32u4 -F -P COM4 -c stk500v1 -b 19200 -U flash:w:build/sigmar_[osx|windows]_bootloader.hex
  • -P COM4 should match the serial port for the Arduino ISP