DS1302三键4位1.5寸数码管时钟

说明：最初跑得不太准，把1302的电容换成7p以后，精度非常好，具体没有查误差，反正好几个月与家里的石英钟很对时。

5v供电，亮度不高，室内用正好。

本人程序基本抄袭的，其中秒是用定时器模拟闪动，各位老师多多指教，原来是显示带拐角的7，让我改了，第一位为零时也改作不显示了，请各位大大批评指正！随便挣俩钱儿(感谢江顺万老师的细心批评指正，由于自己不够严谨导致一点错误，已经在原文改过，深表歉意！)先上电路图：再上个实物图：分解图：最后上c程序，不用下载，照顾没米的大大，欢迎批评，砸点儿币过来。

三鞠躬！/**********************************DS1302 四位数码管***********************************/#include <reg52.h>#define uchar unsigned char#define uint unsigned int#define D P2 //段选#define D P0 //位选sbit IO=P1^1; //数据口sbit SCLK=P1^2; //控制数据时钟sbit RST=P1^0; //使能端、复位端/************按键引脚定义***********/sbit s1=P1^5; //按键加sbit s2=P1^3; //按键减sbit s3=P1^4; //按键选择sbit led=P1^7; //闪烁的小数点uchar s, knum=0,snum,fnum;标志。

/***********写时分秒地址************/#define write_shi 0x84#define write_fen 0x82#define write_miao 0x80/***********读时分秒地址************/#define read_shi 0x85#define read_fen 0x83#define read_miao 0x81bit miao_flag;char miao_num;char Dmiao;char shi,fen,miao; //读出数据存储变量uchar d[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xd8,0x80,0x90}; //不带小数点，共阳uchar dd[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10}; //带小数点，共阳void delay(uint z) //延时函数,z的取值为这个函数的延时ms数，如 delay(200);大约延时200ms.{ //delay(500);大约延时500ms.uint x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}void t0_init() //定时50ms一个中断{TMOD=0X01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;EA=1;ET0=1;TR0=1;}uchar read_1302(uchar add) //读函数{uchar i,date;RST=0; //禁止读写数据for(i=0;i<8;i++){RST=1;SCLK=0;IO=add&0x01;add>>=1;SCLK=1;}for(i=0;i<8;i++){if(IO)date=date|0x80;elsedate=date|0x00;SCLK=1;date>>=1;SCLK=0;}RST=0;date=date/16*10+date%16;//进制转换16转10进制IO=0; //数据读完后，IO口必须为0，不然小时一直显示85 return date;}void write_1302(uchar add,uchar dat) //写函数{uchar i;RST=0; //禁止读写数据SCLK=0;for(i=0;i<8;i++) //写地址{RST=1; //允许读写数据SCLK=0;IO=add&0x01;add>>=1;SCLK=1;}for(i=0;i<8;i++) //写数据{RST=1; //允许读写数据SCLK=0;IO=dat&0x01;dat>>=1;SCLK=1;}RST=0;}void init_1302() //初始化函数设置时间{flag=read_1302(0x81);if(flag&0x80)write_1302(0x8e,0x00); //保护取消，可以进行读写操作write_1302(write_miao,0x56);write_1302(write_fen,0x49);write_1302(write_shi,0x14);write_1302(0x90,0xa5);write_1302(0x8e,0x80); //保护启动，不能进行读写操作}void display(uchar shi,uchar fen) //显示函数{if(knum==0){snum=30;fnum=30;}if(knum==1){fnum++;snum=30;}if(knum==2){snum++;fnum=30;}if(snum>=30){W=0xF7; //位选s=d[shi/10];//段码先给s，判断其值是否为0，if(s==0xc0){W=0xff;D=0xff;}D=s;//s不为零则给D，让其显示delay(5);D=0Xff; //消隐if(miao_flag) //小数点闪烁 {miao_flag=0;W=0xFb;D=dd[shi%10];delay(5);D=0Xff; //消隐}else{W=0xFb;D=d[shi%10];delay(5);D=0Xff;}if(snum==60)snum=0;}if(fnum>=30){W=0xFd;D=d[fen/10];delay(5);D=0Xff; //消隐W=0xFe;D=d[fen%10];delay(5);D=0Xff; //消隐if(fnum==60)fnum=0;}}void read_sf(){miao=read_1302(read_miao); /*if(miao!=Dmiao){Dmiao=miao;TR0=1;miao_flag=1;} */fen=read_1302(read_fen);shi=read_1302(read_shi);display(shi,fen);}void keyscan() //按键扫描函数{if(s3==0) //选择按键按下{delay(10);if(s3==0){while(!s3)display(shi,fen); //加上这句，按键按下就不会闪knum++;if(knum==1) //分闪烁{write_1302(0x8e,0x00); //保护取消write_1302(write_miao,0x80);}if(knum==3) //时钟启动{knum=0;write_1302(write_miao,0x00);write_1302(0x8e,0x80); //保护启动}}}if(knum==1) //分钟调节{if(s1==0) //加{delay(10);if(s1==0){while(!s1)display(shi,fen); //加上这句，按键按下就不会闪fen++;if(fen==60)fen=0;write_1302(write_fen,fen/10*16+fen%10); //写入1302 // read_sf(); //读出时间，然后显示}}if(s2==0){delay(10);if(s2==0){while(!s2)display(shi,fen); //加上这句，按键按下就不会闪 fen--;if(fen==-1)fen=59;write_1302(write_fen,fen/10*16+fen%10);read_sf();}}}if(knum==2){if(s1==0){delay(10);if(s1==0){while(!s1)display(shi,fen); //加上这句，按键按下就不会闪 shi++;if(shi==24)shi=0;write_1302(write_shi,shi/10*16+shi%10);read_sf();}}if(s2==0){delay(10);if(s2==0){while(!s2)display(shi,fen); //加上这句，按键按下就不会闪 shi--;if(shi==-1)shi=23;write_1302(write_shi,shi/10*16+shi%10);read_sf();}}}}void main(){init_1302();t0_init();while(1){ if(miao_num<10)led=0;if(miao_num>=10)led=1;read_sf();keyscan();}}void t0_timer() interrupt 1 {TMOD=0X01;TH0=(65536-50000)/256; TL0=(65536-50000)%256; miao_num++;if(miao_num>=20){miao_num=0;miao_flag=1;}}。