void backlight_increase(void);
void backlight_decrease(void);
void backlight_toggle(void);
void backlight_increase(void);
void backlight_decrease(void);
void backlight_toggle(void);
void backlight_step(void);
void backlight_set(uint8_t level);
void backlight_level(uint8_t level);
uint8_t get_backlight_level(void);
void backlight_step(void);
void backlight_set(uint8_t level);
void backlight_level(uint8_t level);
uint8_t get_backlight_level(void);