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#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar displaydata[4];
uchar code smgduan[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共陽(yáng)數(shù)碼管編碼
uchar code read_rtc_addr[7] ={0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};//DS1302讀取地址
uchar code write_rtc_addr[7]={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};//DS1302寫地址
//順序：秒分時(shí)日月周年,存儲(chǔ)格式為十進(jìn)制
uchar time[7]={30,31,11,23,11,4,23};//時(shí)間
bit flicker;//閃爍
//=======================DS1302引腳===========================
sbit SCLK=P0^6;
sbit IO =P0^4;
sbit RST =P0^5;
//=======================數(shù)碼管引腳===========================
sbit d0=P1^1;//d0~d3 “8”字?jǐn)?shù)碼管
sbit d1=P1^2;
sbit d2=P1^3;
sbit d3=P1^4;
//ACC累加器
sbit ACC0=ACC^0;
sbit ACC7=ACC^7;
/***************DS1302有關(guān)子函數(shù)********************/
void write_byte(uchar dat)//寫一個(gè)字節(jié)
{
uchar i;
ACC=dat;
RST=1;
for(i=8;i>0;i--)
{
IO=ACC0;
SCLK=0;
SCLK=1;
ACC>>=1;
}
}
uchar read_byte()//讀一個(gè)字節(jié)
{
uchar i;
RST=1;
for(i=8;i>0;i--)
{
ACC7=IO;
SCLK=1;
SCLK=0;
ACC>>=1;
}
return ACC;
}
void write_1302(uchar add,uchar dat)//向1302芯片指定地址寫入數(shù)據(jù)
{
RST=0;
SCLK=0;
RST=1;
write_byte(add);
write_byte(dat);
SCLK=1;
RST=0;
}
uchar read_1302(uchar add)//從1302指定地址讀取數(shù)據(jù)
{
uchar temp;
RST=0;
SCLK=0;
RST=1;
write_byte(add);
temp=read_byte();
SCLK=1;
RST=0;
return(temp);
}
uchar BCD_D(uchar bcd)//BCD碼轉(zhuǎn)十進(jìn)制函數(shù)
{
return ((bcd>>4)*10)+(bcd & 0x0f);
}
uchar D_BCD(uchar Dec)//十進(jìn)制轉(zhuǎn)BCD碼函數(shù)
{
return (Dec/10*16+Dec%10);
}
void rtc_init()//初始化1302
{
uchar i,
RST=0;
SCLK=0;
write_1302(0x8e,0x00); //允許寫，禁止寫保護(hù)
for(i=0;i<7;i++)
write_1302(write_rtc_addr[i],D_BCD(time[i]));//寫1302時(shí)鐘數(shù)據(jù)
write_1302(0x8e,0x80); //打開(kāi)寫保護(hù)
}
void read_time()//讀1302時(shí)鐘數(shù)據(jù)
{
uchar i;
write_1302(0x8e,0x00);
for(i=0;i<7;i++)
{
time[i]=BCD_D(read_1302(read_rtc_addr[i]));
}
write_1302(0x8e,0x80);
}
void data_display()
{
static uchar temp;
static uchar i;
read_time();
if(temp!=time[0])
{
temp=time[0];
flicker=1;
}
displaydata[0]=smgduan[time[1]%10];
displaydata[1]=smgduan[time[1]/10];
if(flicker)
{
if(++i>=200)
{
i=0;
flicker=0;
}
displaydata[2]=smgduan[time[2]%10]&0x7f;//秒閃點(diǎn)
}
else displaydata[2]=smgduan[time[2]%10];
displaydata[3]=smgduan[time[2]/10];
}
void display()
{
static uchar i;
P1&=0xe1;//清位碼、消隱
P2=displaydata[i];//送段碼
P1|=0x02<<i;//送位碼
i=++i%4;//循環(huán)計(jì)數(shù)
}
void delay(uint r)
{
while(r--);
}
void main()
{
rtc_init();
while(1)
{
data_display();
display();
delay(100);
}
}

復(fù)制代碼