- Clone of waveshare RP2040-Zero
- Bi-Directional Level shifter
- Female 8-pin mini-din connector
- Sun Type 5c keyboard
- Sun Compact 1 mouse
- Custom PCB designed here
- RP2040 UART0 TX: GPIO0 (keyboard)
- RP2040 UART0 RX: GPIO1 (keyboard)
- RP2040 UART1 RX: GPIO5 (mouse)
- RP2040 GPIO28 (status LED + 220ohm resistor) (breadboard version only)
- RP2040 GPIO16: Neopixel on board (TODO)
- Sun keyboard uses inverted TTL; UART inversion is enabled in firmware
- Sun Compact 1 mouse uses inverted TTL; UART inversion is enabled in firmware
- Common ground between keyboard, mouse, and RP
- Keyboard: 1200 baud, 8N1, inverted logic
- Mouse: 1200 baud, 8N1, inverted logic
rustup target add thumbv6m-none-eabi
cargo install elf2uf2-rs
cargo install flip-linkcargo build_targetTo build without mouse support:
cargo build_target --no-default-featuresTo run unit tests:
cargo test --package type5-logicThis repository is a workspace with:
crates/type5-logic: protocol parsing and key/mouse translation logiccrates/type5-firmware: RP2040 Embassy firmware binary (type5-usb)
Requires picotool and the board to be in bootloader mode:
cargo run_target- Send commands for bell and click
- Handle brightness keys (shifted volume)
- Waveshare RO2040-zero
- rp2040 datasheet
- USB HID key codes
- Sun keyboard manual
- SPARC keyboard spec
- rp2040 reference schematic
There are many projects implementing this. These are a couple I found usful as reference:
Some ideas I'll probably never get to
- Custom PCB and 3D printed case.
- Package the adapter into the keyboard, skipping the cable and mini-din.
- Fully replace the internal PCB, and perform matrix scanning.
- Use a bluetooth micro controller and go wireless.
- Hyper-optimize cost/size/power with the smallest micro possible
AI was used in the creation of the project.