my-keyboard-keymaps/gmmk/pro/iso/keymaps/rodude123s_gmmk_pro/keymap.c

#include QMK_KEYBOARD_H

enum custom_keycodes 
{
    KC_DBL0 = SAFE_RANGE,
    KC_YELLOW,
    KC_GREEN,
};

bool process_record_user(uint16_t keycode, keyrecord_t *record)
{
    switch (keycode)
    {
        case KC_DBL0:
            if (record->event.pressed)
            {
                // when keycode KC_DBL0 is pressed
                SEND_STRING("00");
            }
            else
            {
                // when keycode KC_DBL0 is released
            }
            break;

        case KC_YELLOW:
            if (record->event.pressed)
            {
                //when yellow key is pressed
                rgb_matrix_enable_noeeprom();
                rgb_matrix_sethsv_noeeprom(HSV_YELLOW);
                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
            }
            else
            {
                //when yellow key is not pressed
            }
            break;

        case KC_GREEN:
            if (record->event.pressed)
            {
                //when green key is pressed
                rgb_matrix_enable_noeeprom();
                rgb_matrix_sethsv_noeeprom(HSV_GREEN);
                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
            }
            else
            {
                //when green key is not poressed
            }
            break;

    }
    return true;
};

// clang-format off
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

//      ESC      F1       F2       F3       F4       F5       F6       F7       F8       F9       F10      F11      F12	     Prt           Rotary(Mute)
//      ~        1        2        3        4        5        6        7        8        9        0         -       (=)	     BackSpc           Del
//      Tab      Q        W        E        R        T        Y        U        I        O        P        [        ]                          PgUp
//      Caps     A        S        D        F        G        H        J        K        L        ;        "        #        Enter             PgDn
//      Sh_L     /        Z        X        C        V        B        N        M        ,        .        ?                 Sh_R     Up       End
//      Ct_L     Win_L    Alt_L                               SPACE                               Alt_R    FN       Ct_R     Left     Down     Right


    // The FN key by default maps to a momentary toggle to layer 1 to provide access to the RESET key (to put the board into bootloader mode). Without
    // this mapping, you have to open the case to hit the button on the bottom of the PCB (near the USB cable attachment) while plugging in the USB
    // cable to get the board into bootloader mode - definitely not fun when you're working on your QMK builds. Remove this and put it back to KC_RGUI
    // if that's your preference.
    //
    // To put the keyboard in bootloader mode, use FN+backspace. If you accidentally put it into bootloader, you can just unplug the USB cable and
    // it'll be back to normal when you plug it back in.
    //
    // This keyboard defaults to 6KRO instead of NKRO for compatibility reasons (some KVMs and BIOSes are incompatible with NKRO).
    // Since this is, among other things, a "gaming" keyboard, a key combination to enable NKRO on the fly is provided for convenience.
    // Press Fn+N to toggle between 6KRO and NKRO. This setting is persisted to the EEPROM and thus persists between restarts.
    [0] = LAYOUT(
        KC_ESC, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, TG(1), KC_MPLY,
        KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSPC, KC_PSCR,
        KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_DEL,
        KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT, KC_HOME,
        KC_LSFT, KC_NUBS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_UP, KC_END, 
        KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_RALT, MO(2), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT),
    [1] = LAYOUT(
        KC_ESC, KC_F13, KC_F14, KC_F15, KC_F16, KC_F17, KC_F18, KC_F19, KC_F20, KC_F21, KC_F22, KC_F23, KC_F24, KC_TRNS, KC_MPLY, 
        KC_GRV, TG(0), KC_TRNS, TG(2), KC_4, KC_5, KC_6, KC_P7, KC_P8, KC_P9, KC_PSLS, KC_MINS, KC_EQL, KC_BSPC, KC_PSCR,
        KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_P4, KC_P5, KC_P6, KC_PAST, KC_LBRC, KC_RBRC, KC_DEL,
        KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_P1, KC_P2, KC_P3, KC_PMNS, KC_GRV, KC_NUHS, KC_ENT, KC_HOME,
        KC_LSFT, KC_NUBS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_P0, KC_DBL0, KC_PDOT, KC_PPLS, KC_RSFT, KC_UP, KC_END, 
        KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, MO(2), KC_NLCK, KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT),
    [2] = LAYOUT(
        KC_ESC, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_TRNS, KC_MPLY, 
        KC_GRV, TG(0), TG(1), KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_BSPC, KC_PSCR,
        KC_TAB, BL_TOGG, BL_ON, KC_TRNS, KC_TRNS, RGB_HUI, KC_TRNS, KC_TRNS, KC_TRNS, RGB_HUI, RGB_SAI, RGB_VAI, KC_TRNS, KC_DEL,
        KC_CAPS, RGB_TOG, KC_YELLOW, KC_GREEN, KC_TRNS, KC_MYCM, KC_MAIL, KC_CALC, KC_TRNS, RGB_HUD, RGB_SAD, RGB_VAD, RESET, KC_ENT, KC_HOME,
        KC_LSFT, KC_TRNS, KC_MPRV, KC_MNXT, KC_MSEL, KC_TRNS, KC_BRIU, KC_BRID, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_RSFT, KC_UP, KC_END, 
        KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_TRNS, KC_TRNS, KC_TRNS, KC_LEFT, KC_DOWN, KC_RGHT)


};
// clang-format on

#ifdef ENCODER_ENABLE
bool encoder_update_user(uint8_t index, bool clockwise) {
    if (clockwise) {
      tap_code(KC_VOLU);
    } else {
      tap_code(KC_VOLD);
    }
    return true;
}
#endif