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RGB

Custom RGB code can be disabled by setting CUSTOM_RGBLIGHT = no or CUSTOM_RGB_MATRIX = no in your rules.mk

RGB Light

Layer Indication Code

At least for RGB Light, the layer_state_set function is used to detect the current highest layer, and change the underglow based on that layer.

This works for both the regular layers, and for the default layers, too.

I use the sethsv variants of the commands, so that different modes can be used, as well.

RGB Matrix uses a custom, per board implementation, at the moment.

RGB Light Startup Animation

On startup, if enabled, the board will cycle through the entire hue wheel, starting and ending on the default layer color.

void keyboard_post_init_rgb(void) {
#if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_STARTUP_ANIMATION)
    if (userspace_config.rgb_layer_change) { rgblight_enable_noeeprom(); }
    if (rgblight_config.enable) {
        layer_state_set_user(layer_state);
        uint16_t old_hue = rgblight_config.hue;
        rgblight_mode_noeeprom(RGBLIGHT_MODE_STATIC_LIGHT);
        for (uint16_t i = 255; i > 0; i--) {
            rgblight_sethsv_noeeprom( ( i + old_hue) % 255, 255, 255);
            matrix_scan();
            wait_ms(10);
        }
    }
#endif
    layer_state_set_user(layer_state);
}

This could probably benefit from some cleanup and better handling.

RGB Matrix

Idle Animation

This feature can be toggled with the RGB_IDL keycode.

This sets the mode to the Heatmap Animation when typing, but will switch to the cycle in animations when idle.

Layer Indication

This sets the modifier keys to indicate the current layer state, with the option to override the behavior.

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RGB