qmk-firmware/keyboards/keebio/iris/rev4/rev4.c

#include "quantum.h"

void eeconfig_init_kb(void) {
#ifdef BACKLIGHT_ENABLE
    backlight_enable();
    backlight_level(3);
#endif
#ifdef RGBLIGHT_ENABLE
    rgblight_enable(); // Enable RGB by default
    rgblight_sethsv(0, 255, 255);  // Set default HSV - red hue, full saturation, full brightness
#ifdef RGBLIGHT_EFFECT_RAINBOW_SWIRL
    rgblight_mode(RGBLIGHT_MODE_RAINBOW_SWIRL + 2); // set to RGB_RAINBOW_SWIRL by default
#endif
#endif

    eeconfig_update_kb(0);
    eeconfig_init_user();
}

#ifdef ENCODER_ENABLE
bool encoder_update_kb(uint8_t index, bool clockwise) {
    if (!encoder_update_user(index, clockwise)) { return false; }
    if (index == 0) {
        if (clockwise) {
            tap_code(KC_VOLU);
        } else {
            tap_code(KC_VOLD);
        }
    } else if (index == 1) {
        if (clockwise) {
            tap_code(KC_PGDN);
        } else {
            tap_code(KC_PGUP);
        }
    }
    return false;
}
#endif