qmk_firmware_custom/keyboards/crkbd/keymaps/edvorakjp/oled.h

#ifndef OLED_USER_H
#define OLED_USER_H

//SSD1306 OLED update loop, make sure to add #define SSD1306OLED in config.h
#include "ssd1306.h"
#include "edvorakjp.h"

//assign the right code to your layers for OLED display
#define L_BASE 0

extern uint8_t is_master;
extern bool japanese_mode;

// method prototypes defined in crkbd/lib
extern const char *read_logo(void);

const char *read_mode_icon(bool swap);
const char *read_layer_state(void);
const char *read_host_led_state(void);
void matrix_update(struct CharacterMatrix *dest,
                   const struct CharacterMatrix *source);
void iota_gfx_task_user(void);

#endif // OLED_CONFIG_USER_H