extern void lcd_clear_and_home(void);

extern void lcd_goto(unsigned char pos);

extern void lcd_write_byte(unsigned char);

extern void lcd_write_char(char);

extern void lcd_write_string(const char * s);

extern void lcd_overwrite_string(const char * s);

extern void lcd_write_string_at_second_line(const char * s);
	
extern void lcd_initialize(void);

extern void lcd_load_custom_characters(void);

extern void lcd_draw_logo(void);