ACID firmware

Building

Compiling libxkbcommon

This needs to be done on Linux or in WSL. meson.build needs to be changed such that pkgconfig.generate is called with the variables field embedded directly, for some reason:

    variables: [
        f'xkb_root=@XKB_CONFIG_ROOT@',
        f'xkb_extra_path=@XKB_CONFIG_EXTRA_PATH@',
    ],

Then, the tests, fuzzes and benches need to be commented out. Afterwards, the following command should succeed in building the static library in debug mode:

meson setup build-debug -Denable-x11=false -Dxkb-config-root=/usr/share/X11/xkb -Dx-locale-root=/usr/share/X11/locale -Denable-wayland=false --cross-file cross-esp32s3.txt -Denable-xkbregistry=false -Denable-docs=false -Denable-tools=false --wipe --buildtype=debug
meson compile -C build-debug

Afterwards, a static library with redefined externally-linked symbols needs to be generated:

path/to/root/libxkbcommon-redefine-syms.sh build-debug/libxkbcommon{,_redefined_syms}.a

Creating keymaps

To generate an English (US) keymap, the following command may be used:

xkbcli compile-keymap --include [path-to-xkb-directory] --layout us >my_compose.txt

Substitute us for any other 2-letter country code.

Where the [path-to-xkb-directory] is one of the following:

the /usr/share/X11/xkb directory on X11-based Linux distributions;
the xkeyboard-config git repository. There's an button to download it as a ZIP archive.

The most relevant part of the keymap is likely found in the symbols directory, where variants of keymaps are defined for many languages.

Compiling Compose files

Use libxkbcommon's xkbcli to compile a standalone compose file:

xkbcli compile-compose [path-to-Compose-file] >my_compose.txt

Compose files to replace [path-to-Compose-file] with may be found in:

the /usr/share/X11/locale directory on X11-based Linux distributions;
the libx11 git repository. There's an button to download it as a ZIP archive.

esp32s3 BLE example

To run this example, you should have latest Rust in esp channel installed. The full instruction of installing esp Rust toolchain can be found here.

espflash should also be installed:

cargo install cargo-espflash espflash

After having everything installed, use the following command to run the example:

cd examples/use_rust/esp32s3_ble
cargo +esp run --release

If everything is good, you'll see the log as the following:

cargo run --release
    Compiling ...
    ...
    ...
    Finished `release` profile [optimized + debuginfo] target(s) in 11.70s
     Running `espflash flash --monitor --port /dev/cu.usbmodem211401 target/xtensa-esp32s3-none-elf/release/rmk-esp32s3`
[2025-04-10T10:01:23Z INFO ] Serial port: '/dev/cu.usbmodem211401'
[2025-04-10T10:01:23Z INFO ] Connecting...
[2025-04-10T10:01:23Z INFO ] Using flash stub
Chip type:         esp32s3 (revision v0.1)
Crystal frequency: 40 MHz
Flash size:        4MB
Features:          WiFi 6, BT 5
MAC address:       40:4c:ca:5b:c7:dc
App/part. size:    768,944/4,128,768 bytes, 18.62%
[2025-04-10T10:01:23Z INFO ] Segment at address '0x0' has not changed, skipping write
[2025-04-10T10:01:23Z INFO ] Segment at address '0x8000' has not changed, skipping write
[00:00:06] [========================================]     411/411     0x10000                                                                                             [2025-04-10T10:01:31Z INFO ] Flashing has completed!

If espflash reports the following error:

Error: espflash::connection_failed

  × Error while connecting to device
  ╰─▶ Serial port not found

You should to identify which serial port are connected to your esp board, and use --port to specify the used serial port:

# Suppose that the esp board are connected to /dev/cu.usbmodem211401
cargo run --release -- --port /dev/cu.usbmodem211401

If you want to get some insight of segments of your binary, espsegs would help:

# Install it first
cargo install --git https://github.com/bjoernQ/espsegs

# Check all segments
espsegs target/xtensa-esp32s3-none-elf/release/rmk-esp32s3 --chip esp32s3

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