Linux tool to modify HHKB Studio keymap

Usage

1. Find /dev/hidraw* device to communicate and adjust permission

$ sudo setfacl -m u:$USER:rw /dev/hidraw1

2. Query the keyboard to see if the communication channel works

$ hhkb-studio-tools info
Product name: HHKB-Studio
...

3. Fetch the current keymap data (of the current profile)

$ hhkb-studio-tools read-profile > profile.toml

4. Show the fetched keymap data and modify it by using text editor

$ hhkb-studio-tools show-profile < profile.toml

• The keymap data consists of four layers (Base, Fn1, Fn2, and Fn3.)
• Each layer is 240 bytes (15 keys x 8 rows with some blank entries.)

5. Load the modified keymap data to the keyboard

$ hhkb-studio-tools write-profile < profile_new.toml