void disp_init(void);
void disp_clear(unsigned char x0, unsigned char x1, unsigned char y);
void disp_char(unsigned char x, unsigned char y, unsigned char ascii);
void disp_char_str(unsigned char x, unsigned char y, unsigned char *str);
void disp_word(unsigned char x, unsigned char y, unsigned char word);

void delay_ms(unsigned char i);