ardupilot/libraries/AP_Notify/Display_Backend.h

#pragma once

#include "Display.h"

#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BBBMINI
#define NOTIFY_DISPLAY_I2C_BUS 2
#else
#define NOTIFY_DISPLAY_I2C_BUS 1
#endif
#define NOTIFY_DISPLAY_I2C_ADDR 0x3C

class Display_Backend {

public:
    virtual bool hw_init() = 0;
    virtual void hw_update() = 0;
    virtual void set_pixel(uint16_t x, uint16_t y) = 0;
    virtual void clear_pixel(uint16_t x, uint16_t y) = 0;
    virtual void clear_screen() = 0;
};