以lcd1602为显示器的 51单片机数字时钟（时分秒年月日星期）

#include<reg52.h> #define uchar unsigned char #define uint unsigned int sbit dula=P2^6; sbit wela=P2^7; sbit lcden=P3^4; sbit lcdrs=P3^5; sbit key1=P1^2; sbit key2=P1^1; sbit key3=P1^0; uchar shi=0,fen=0,miao=0,num,jie,cnt; uint year=2000,month=1,day=1,weekday; uchar table_num[]="0123456789"; uchar table_week[][4]={"SUN","MON","TUE","WED","THU","FRI","SAT"}; void delay(uint xms) { uint i,j; for(i=xms;i>0;i--) for(j=114;j>0;j--); } void write_com(uchar com) { lcdrs=0; P0=com; delay(5); lcden=1; delay(5); lcden=0; } void write_data(uchar date) { lcdrs=1; P0=date; delay(5); lcden=1; delay(5); lcden=0; } void init() { TMOD=0x11; TH0=(65536-50000)/256; TL0=(65536-50000)%256; TR0=1; ET0=1; EA=1; dula=0; wela=0; lcden=0; write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); } uchar run(uint y) { if((!(y%4)&&(y%100))||!(y%400)) return 1; else return 0; } void write_time() { write_com(0x80+0x40+0x04); write_data(table_num[shi/10]);write_data(table_num[shi%10]);write_data(':'); write_data(table_num[fen/10]);write_data(table_num[fen%10]);write_data(':'); write_data(table_num[miao/10]);write_data(table_num[miao%10]); } void write_date() { write_com(0x80+0x01); write_data(table_num[year/1000]);write_data(table_num[year%1000/100]);write_data(table_num[year%1000%100/10]);write_data(table_num[year%10]); write_data('-');write_data(table_num[month/10]);write_data(table_num[month%10]);write_data('-'); write_data(table_num[day/10]);write_data(table_num[day%10]); write_data(' ');write_data(' '); write_data(table_week[weekday][0]);write_data(table_week[weekday][1]);write_data(table_week[weekday][2]); } void time_cnt() { if(num>=20) { num=0; miao++; if(miao>=60) { miao=0; fen++; if(fen>=60) { fen=0; shi++; if(shi>=24) { shi=0; day++; weekday++; if(weekday>6) weekday=0; switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: jie=31; break; case 4: case 6: case 9: case 11: jie=30; break; case 2: if(run(year)) jie=29; else jie=28; break; } if(day>jie) { day=1; month++; if(month>12) { month=1; year++; } } } } } write_time(); write_date(); } } void timer0() interrupt 1 { TH0=(65536-50000)/256; TL0=(65536-50000)%256; num++; time_cnt(); } void adjust() { if(key1==0) { delay(5); if(key1==0) { cnt++; switch(cnt) { case 1: TR0=0; write_com(0x80+0x03); write_com(0x0f); break; case 2: write_com(0x80+0x07); break; case 3: write_com(0x80+0x0a); break; case 4: write_com(0x80+0x0e); break; case 5: write_com(0x80+0x40+0x05); break; case 6: write_com(0x80+0x40+0x08); break; case 7: write_com(0x80+0x40+0xb); break; case 8: write_com(0x0c); TR0=1; cnt=0; break; } } while(!key1) ; } if(key2==0) { delay(5); if(key2==0) { switch(cnt) { case 1: year++; write_com(0x0c); write_date(); write_com(0x80+0x03); write_com(0x0f); break; case 2: month++; if(month>=13) month=1; write_com(0x0c); write_date(); write_com(0x80+0x07); write_com(0x0f); break; case 3: day++; switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: jie=31; break; case 4: case 6: case 9: case 11: jie=30; break; case 2: if(run(year)) jie=29; else jie=28; break; } if(day>jie) day=1; write_com(0x0c); write_date(); write_com(0x80+0x0a); write_com(0x0f); break; case 4: weekday++; if(weekday>6) weekday=0; write_com(0x0c); write_date(); write_com(0x80+0x0e); write_com(0x0f); break; case 5: shi++; if(shi>=24) shi=0; write_com(0x0c); write_time(); write_com(0x80+0x40+0x05); write_com(0x0f); break; case 6: fen++; if(fen>=60) fen=0; write_com(0x0c); write_time(); write_com(0x80+0x40+0x08); write_com(0x0f); break; case 7: miao++; if(miao>=60) miao=0; write_com(0x0c); write_time(); write_com(0x80+0x40+0xb); write_com(0x0f); break; case 0:; } while(!key2) ; } } if(key3==0) { delay(5); if(key3==0) { switch(cnt) { case 1: year--; write_com(0x0c); write_date(); write_com(0x80+0x03); write_com(0x0f); break; case 2: month--; if(month<1) month=12; write_com(0x0c); write_date(); write_com(0x80+0x07); write_com(0x0f); break; case 3: day--; switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: jie=31; break; case 4: case 6: case 9: case 11: jie=30; break; case 2: if(run(year)) jie=29; else jie=28; break; } if(day<1) day=jie; write_com(0x0c); write_date(); write_com(0x80+0x0a); write_com(0x0f); break; case 4: weekday--; if(weekday==-1) {weekday=6;} write_com(0x0c); write_date(); write_com(0x80+0x0e); write_com(0x0f); break; case 5: shi--; if(shi==-1) {shi=23;} write_com(0x0c); write_time(); write_com(0x80+0x40+0x05); write_com(0x0f); break; case 6: fen--; if(fen==-1) {fen=59;} write_com(0x0c); write_time(); write_com(0x80+0x40+0x08); write_com(0x0f); break; case 7: miao--; if(miao==-1) {miao=59;} write_com(0x0c); write_time(); write_com(0x80+0x40+0xb); write_com(0x0f); break; case 0:; } while(!key3) ; } } } void main() { init(); while(1) { adjust(); } }