rawtalk

Sync Neovim mode with QMK keyboard layers via Raw HID.

• Insert mode -> Colemak-DH (layer 0)
• Normal/other modes -> QWERTY (layer 3)

Setup

1. Build & Run

cargo build --release
./target/release/rawtalk

2. Neovim Config

Add to init.lua:

local socket, client, connected = "/tmp/rawtalk.sock", nil, false
local uv = vim.loop

local function send(mode)
    if not connected then
        client = uv.new_pipe()
        client:connect(socket, function(err) connected = not err end)
        vim.wait(50, function() return connected end)
    end
    if connected then pcall(function() client:write(mode .. "\n") end) end
end

vim.api.nvim_create_autocmd("ModeChanged", {
    callback = function() send(vim.fn.mode()) end
})

3. QMK Keymap

Add to keymap.c:

void raw_hid_receive_kb(uint8_t *data, uint8_t length) {
    if (data[0] == 0x00 && data[1] <= 3) {
        set_single_default_layer(data[1]);
        data[0] = 0x00;
        data[1] = data[1];
        data[2] = 0xAA;
        raw_hid_send(data, length);
    }
}

Enable in rules.mk:

RAW_ENABLE = yes

Linux udev rules

echo 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="c2ab", ATTRS{idProduct}=="3939", TAG+="uaccess"' | \
  sudo tee /etc/udev/rules.d/70-qmk.rules
sudo udevadm control --reload-rules

Config

Env Variable	Default	Description
RAWTALK_SOCKET	/tmp/rawtalk.sock	Socket path

Edit VID/PID in main.rs for different keyboards.

License

Licensed under the Apache License 2.0.