qmk_firmware/keyboards/pteron36/keymaps/via/keymap.c

 /* Copyright HarshitGoel96 2020
  * With permission from mattdibi, the original maintainer of the Redox hardware.
  * 
  * This program is free software: you can redistribute it and/or modify 
  * it under the terms of the GNU General Public License as published by 
  * the Free Software Foundation, either version 2 of the License, or 
  * (at your option) any later version. 
  * 
  * This program is distributed in the hope that it will be useful, 
  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
  * GNU General Public License for more details. 
  * 
  * You should have received a copy of the GNU General Public License 
  * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
  */ 
#include QMK_KEYBOARD_H

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.

enum layer_names  {
  _QWERTY,
  _SYMB,
  _NAV,
  _ADJUST,
  _MOUSE,
  _NUMB,
  _FNR
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

  [_QWERTY] = LAYOUT_split_3x5_3_encoder(
         KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,                               KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,
         KC_A,    KC_S,    KC_D,    KC_F,    KC_G,                               KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN,
         KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,KC_LBRACKET,    KC_RBRACKET,   KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,
                                   KC_LGUI, KC_BSPC, KC_SPC,           KC_SPC,  KC_ENT,  KC_RALT
  ),

  [_SYMB] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  ),

  [_NAV] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  ),

  [_ADJUST] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  ),
 [_MOUSE] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  ),

  [_NUMB] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  ),

  [_FNR] = LAYOUT_split_3x5_3_encoder(
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,                               KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
   KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,             KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,    KC_TRNS,
                                          KC_TRNS, KC_TRNS, KC_TRNS,             KC_TRNS,  KC_TRNS,  KC_TRNS
  )

};

#ifdef OLED_DRIVER_ENABLE

static void render_logo(void) {
    static const char PROGMEM qmk_logo[] = {
        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94,
        0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4,
        0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0x00
    };

    oled_write_P(qmk_logo, false);
}
static void render_status(void){
    oled_write_P(PSTR("Layer: "), false);

     switch (get_highest_layer(layer_state)) {
        case _QWERTY:
            oled_write_P(PSTR("Default\n"), false);
            break;
        case _SYMB:
            oled_write_P(PSTR("Symbol\n"), false);
            break;
        case _NAV:
            oled_write_P(PSTR("Nav\n"), false);
            break;
        case _ADJUST:
            oled_write_P(PSTR("Adjust\n"), false);
            break;
        case _MOUSE:
            oled_write_P(PSTR("Mouse\n"), false);
            break;
        case _NUMB:
            oled_write_P(PSTR("Number\n"), false);
            break;
        case _FNR:
            oled_write_P(PSTR("FunR\n"), false);
            break;
        default:
            // Or use the write_ln shortcut over adding '\n' to the end of your string
            oled_write_ln_P(PSTR("Undefined"), false);
    }

    // Host Keyboard LED Status
    led_t led_state = host_keyboard_led_state();
    oled_write_P(led_state.num_lock ? PSTR("NUM ") : PSTR("    "), false);
    oled_write_P(led_state.caps_lock ? PSTR("CAP ") : PSTR("    "), false);
    oled_write_P(led_state.scroll_lock ? PSTR("SCR ") : PSTR("    "), false);
}
void oled_task_user(void) {
    if (is_keyboard_master()) {
        render_status();  // Renders the current keyboard state (layer, lock, caps, scroll, etc)
    } else {
        render_logo();  // Renders a static logo
        oled_scroll_left();  // Turns on scrolling
    }
}
#endif