这是我教的学生写的带闰年补偿的一个时钟，比我自己写成的还有成就感
#include <reg51.h> #include<delay.h> #define uchar unsigned char #define uint unsigned int uchar S1num; sbit RS=P1^0; sbit RW=P1^1; sbit EN=P1^2; sbit GND=P2^4; sbit K2=P2^3; sbit K4=P2^2; sbit K6=P2^1; uchar x,num,shi,fen,miao,day,mon,year,week,count; void display(); void write_com(uchar com) { RS=0; EN=0; P0=com; delay(5); //RW=0; EN=1; delay(5); EN=0; } void write_dat(uchar dat) { RS=1; EN=0; P0=dat; delay(5); //RW=0; EN=1; delay(5); EN=0; } void timer0()interrupt 1 { TH0=(65536-45872)/256;//45872这个值是11.0592MHz产生一次中断，最接近50Ms,如果是12MHz请用50000 TL0=(65536-45872)%256; count++; } write_sfm(uchar add,uchar date) { uchar shi,ge; write_com(0x80+0x40+add); shi=date/10; ge=date%10; write_dat(0x30+shi); write_dat(0x30+ge); } write_ymd(uchar add,uchar date) { uchar shi,ge; write_com(0x80+add); shi=date/10; ge=date%10; write_dat(0x30+shi); write_dat(0x30+ge); } write_week(week) { switch(week) { case 1:write_dat('M'); write_dat('O'); write_dat('N'); break; case 2:write_dat('T'); write_dat('U'); write_dat('E'); break; case 3:write_dat('W'); write_dat('E'); write_dat('N'); break; case 4:write_dat('T'); write_dat('H'); write_dat('U'); break; case 5:write_dat('F'); write_dat('R'); write_dat('I'); break; case 6:write_dat('S'); write_dat('A'); write_dat('T'); break; case 7:write_dat('S'); write_dat('U'); write_dat('N'); break; } } void init() { EN=0; RW=0; write_com(0x38);//显示模式 delay(5); write_com(0x0c);//开显示 write_com(0x06);//光标自加 write_com(0x80);//指针左一 write_com(0x01);//清屏 TMOD=0x01;//定时器0的工作方式1 TH0=(65536-50000)/256; TL0=(65536-50000)%256; EA=1;//开中断 ET0=1; TR0=1;//开定时器 display(); } void display() { write_sfm(10,0); write_com(0x80+0x40+11); write_com(0x80+0x40+9); write_dat(':'); write_sfm(7,0); write_com(0x80+0x40+8); write_com(0x80+0x40+6); write_dat(':'); write_sfm(4,0); write_com(0x80+0x40+5); write_ymd(10,29); write_com(0x80+11); write_com(0x80+9); write_dat('-'); write_ymd(7,3); write_com(0x80+8); write_com(0x80+6); write_dat('-'); write_com(0x80+2); write_dat('2'); write_dat('0'); write_ymd(4,12); write_com(0x80+5); write_com(0x80+13); write_week(4); } void keyscan() { if(K2==0) { delay(5); if(K2==0);//防止误动作 { S1num++; while(!K2); switch(S1num) { case 1: TR0=0; write_com(0x80+0x40+11); write_com(0x0f); break; case 2: write_com(0x80+0x40+8); break; case 3: write_com(0x80+0x40+5); break; case 4: write_com(0x80+11); break; case 5: write_com(0x80+8); break; case 6: write_com(0x80+5); break; case 7: write_com(0x80+13); break; case 8: S1num=0; TR0=1; write_com(0x0c); break; } } } if(S1num!=0) { if(K4==0) { delay(5); while(!K4); switch(S1num) { case 1: miao++; if(miao==60)miao=0; write_sfm(10,miao); write_com(0x80+0x40+11); break; case 2: fen++; if(fen==60)fen=0; write_sfm(7,fen); write_com(0x80+0x40+8); break; case 3: shi++; if(shi==24)shi=0; write_sfm(4,shi); write_com(0x80+0x40+5); break; case 4: day++; switch(mon) { case 1:if(day==32)day=1;break; case 3:if(day==32)day=1;break; case 5:if(day==32)day=1;break; case 7:if(day==32)day=1;break; case 8:if(day==32)day=1;break; case 10:if(day==32)day=1;break; case 12:if(day==32)day=1;break; case 4:if(day==31)day=1;break; case 6:if(day==31)day=1;break; case 9:if(day==31)day=1;break; case 11:if(day==31)day=1;break; case 2:x=20*100+year; if((x%4==0 && x%100!=0) || x%400==0) { if(day==30) { day=1;break; } } else if(day==29) { day=1;break; } } write_ymd(10,day); write_com(0x80+11); break; case 5: mon++; if(mon==13)mon=1; write_ymd(7,mon); write_com(0x80+8); break; case 6: year++; write_ymd(4,year); write_com(0x80+5); break; case 7: week++; if(week==8)week=1; write_week(week); write_com(0x80+13); break; } } if(K6==0) { delay(5); while(!K6); switch(S1num) { case 1: miao--; if(miao==-1)miao=59; write_sfm(10,miao); write_com(0x80+0x40+11); break; case 2: fen--; if(fen==-1)fen=59; write_sfm(7,fen); write_com(0x80+0x40+8); break; case 3: shi--; if(shi==-1)shi=23; write_sfm(4,shi); write_com(0x80+0x40+5); break; case 4: day--; switch(mon) { case 1:if(day==0)day=31;break; case 3:if(day==0)day=31;break; case 5:if(day==0)day=31;break; case 7:if(day==0)day=31;break; case 8:if(day==0)day=31;break; case 10:if(day==0)day=31;break; case 12:if(day==0)day=31;break; case 4:if(day==0)day=30;break; case 6:if(day==0)day=30;break; case 9:if(day==0)day=30;break; case 11:if(day==0)day=30;break; case 2:x=20*100+year; if((x%4==0 && x%100!=0) || x%400==0) { if(day==0) { day=29;break; } } else if(day==0) { day=28;break; } } write_ymd(10,day); write_com(0x80+11); break; case 5: mon--; if(mon==0)mon=12; write_ymd(7,mon); write_com(0x80+8); break; case 6: year--; write_ymd(4,year); write_com(0x80+5); break; case 7: week--; if(week==-1)week=7; write_week(week); write_com(0x80+13); break; } } } } void main() { init(); GND=0; while(1) { keyscan(); if(count==20) { count=0; miao++; if(miao==60) { miao=0; fen++; if(fen==60) { fen=0; shi++; if(shi==24) { shi=0; day++; week++; switch(mon) { case 1:if(day==32)day=1;mon++;break; case 3:if(day==32)day=1;mon++;break; case 5:if(day==32)day=1;mon++;break; case 7:if(day==32)day=1;mon++;break; case 8:if(day==32)day=1;mon++;break; case 10:if(day==32)day=1;mon++;break; case 12:if(day==32)day=1;mon++;break; case 4:if(day==31)day=1;mon++;break; case 6:if(day==31)day=1;mon++;break; case 9:if(day==31)day=1;mon++;break; case 11:if(day==31)day=1;mon++;break; case 2:x=20*100+year; if((x%4==0 && x%100!=0) || x%400==0) { if(day==30) { day=1;mon++;break; } } else if(day==29) { day=1;mon++;