extern shiftport; 
extern clockport; 
extern latchport;
extern LCDPORT;
extern RSPORT;
extern ENPORT; 


void lcd_init(void);
void out_74595(unsigned char shift_data);
void lcd_out(unsigned char lcd_data,unsigned char rs_bit);
void lcd_packet(unsigned char raw_data,unsigned char rs_bit);
void lcd_clear();
void lcd_st(unsigned char *string);
void lcd_num(unsigned int conv, unsigned char digit, unsigned char lz);
void lcd_hex(unsigned char dec);
void lcd_pos(unsigned char line,unsigned char column);
unsigned char num2hex(unsigned char decimal);
unsigned char lzero(unsigned char decimal,unsigned char showz);

//extern unsigned char bit_no;
//extern unsigned char rs_state;
//extern unsigned char clockbit,latchbit;