void lcd_init();
void send_cmd(uchar lcd_cmd);
void 	send_data(uchar lcd_data);
void 	check_ready();
void 	lcd_task();
bit ClkIsLeapYear(uint year);
void 	lcd_disp_time();
void 	lcd_disp_dow();
void 	lcd_disp_year();
void 	lcd_disp_clock(void);
uchar read_status();
void 	cpy_time_str(uchar *st1, uchar *st2);
void 	cpy_dow_str(uchar *st1, uchar *st2);
void 	cpy_year_str(uchar *st1, uchar *st2);

extern uchar sec;
extern uchar min;
extern uchar hour;
extern uchar date;
extern uchar month;
extern uchar year;
extern uchar day_of_week;
extern uchar clk_hour;
extern uchar clk_min;
extern uchar code hex2bcd[];
extern uchar code bcd2hex[];