单片机·实时时钟DS1302

dat>>

dat>>

23,15,8,7,10} ;

# define ds1302_w_addr 0x80

# define ds1302_r_addr 0x81

# endif

main.c

# include "main.h"

void write_ds1302_byte(uint8 dat)

{

uint8 i ;

for(i=0; i<8; i++)

{

SDA = dat&0x01 ;

dat>>=1 ;

SCK = 1 ;

SCK = 0 ;

}

}

uint8 read_ds1302_byte(void)

{

uint8 i, dat = 0 ;

for(i=0; i<8; i++)

{

dat>>=1 ;

if(SDA)

dat |= 0x80 ;

SCK = 1 ;

SCK = 0 ;

}

return dat ;

}

void reset_ds1302(void)

{

RST = 0 ;

SDA = 0 ;

RST = 1 ;

}

void clear_ds1302_wp(void)

{

reset_ds1302() ;

RST = 1 ;

write_ds1302_byte(0x8E) ;

write_ds1302_byte(0) ;

SDA = 0 ;

RST = 0 ;

}

void set_ds1302_wp(void)

{

reset_ds1302() ;

RST = 1 ;

write_ds1302_byte(0x8E) ;

write_ds1302_byte(0x80) ;

SDA = 0 ;

RST = 0 ;

}

void write_ds1302(uint8 addr,uint8 dat)

{

reset_ds1302() ;

RST = 1 ;

write_ds1302_byte(addr) ;

write_ds1302_byte(dat) ;

SDA = 0 ;

RST = 0 ;

}

uint8 read_ds1302(uint8 addr)

{

uint8 temp = 0 ;

reset_ds1302() ;

RST = 1 ;

write_ds1302_byte(addr) ;

temp =read_ds1302_byte() ;

SDA = 0 ;

RST = 0 ;

return temp ;

}

void set_time(uint8 *timedata)

{

uint8 i, tmp ;

for(i=0; i<7; i++)

{

tmp = timedata[i]/10 ;

timedata[i] = timedata[i] ;

timedata[i] = tmp*16 + timedata[i] ;

}

tmp = ds1302_w_addr ;

clear_ds1302_wp() ;

for(i=0; i<7; i++)

{

write_ds1302(tmp,timedata[i]) ;

tmp+=2 ;

}

set_ds1302_wp() ;

}

void read_time(uint8 *timedata)

{

uint8 temp, i ;

temp = ds1302_r_addr ;

for(i=0; i<7; i++)

{

timedata[i] = read_ds1302(temp) ;

temp+= 2 ;

}

}

void wait(void)

{

P0 = 0xFF ;

while(BUSY)

{

RS = 0 ;

RW = 1 ;

EN = 0 ;

EN = 1 ;

}

EN = 0 ;

}

void w_dat(uint8 dat)

{

wait() ;

EN = 0 ;

P0 = dat ;

RS = 1 ;

RW = 0 ;

EN = 1 ;

EN = 0 ;

}

void w_cmd(uint8 cmd)

{

wait() ;

EN = 0 ;

P0 = cmd ;

RS = 0 ;

RW = 0 ;

EN = 1 ;

EN = 0 ;

}

void w_hexnum(uint8 dat)

{

w_dat(dat/16 + 0) ; //这里注意/16，输出为8421BCD码，需要转换

w_dat(dat + 0) ;

}

void Init_LCD1602(void)

{

w_cmd(0x38) ;

w_cmd(0x0c) ;

w_cmd(0x06) ;

w_cmd(0x01) ;

}

void main(void)

{

Init_LCD1602() ;

set_time(&time) ;

while(1)

{

read_time(&time) ; //指针的概念

w_cmd(0x80) ;

w_hexnum(time[6]) ;

w_dat(-) ;

w_hexnum(time[4]) ;

w_dat(-) ;

w_hexnum(time[3]) ;

w_cmd(0xC0) ;

w_hexnum(time[2]) ;

w_dat(:) ;

w_hexnum(time[1]) ;

w_dat(:) ;

w_hexnum(time[0]) ;

}

}