1602液晶单片机数字钟按键

只看该作者 · 2011-10-7 16:50

按键操作，功能键在时、分、秒间选择，在实验板上可以完成，但是选中好像是随机的，不稳定，请问：以下程序有错误吗？

/***************************************
1602数字钟
***************************************/
#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 lcdrw=P3^6;
sbit s1=P3^0;
sbit s2=P3^1;
sbit s3=P3^2;
sbit rd=P3^7;
uchar i,j,shi,fen,miao,s1num;
uchar code table[]="2011-10-06 MON";
uchar code table1[]="00:00:00";
void delay(uint x)
{
uint a,b;
for(a=x;a>0;a--)
for(b=110;b>0;b--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init()
{
dula=0;
wela=0;
lcdrw=0;
lcden=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
for(i=0;i<14;i++)
{
write_date(table[i]);
}
write_com(0x80+0x40+3);
for(i=0;i<8;i++)
{
write_date(table1[i]);
}
TMOD=0x01;
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void write_sfm(uchar add,uchar date)
{
uchar ge,shi;
shi=date/10;
ge=date%10;
write_com(0x80+0x40+add);
write_date(0x30+shi);
write_date(0x30+ge);
}
void keyscan()
{
   rd=0;
   if(s1==0)
   {
     delay(5);
if(s1==0)
{
s1num++;
while(!s1);
if(s1num==1)
{
     TR0=0;
write_com(0x80+0x40+10);
write_com(0x0f);
}
if(s1num==2)
{
write_com(0x80+0x40+7);
}
if(s1num==3)
{
write_com(0x80+0x40+4);
}
if(s1num==4)
{
s1num=0;
write_com(0x0c);
TR0=1;
}
}
   }
}
void main()
{
init();
while(1)
{
keyscan();
if(j==20)
{
j=0;
miao++;
if(miao==60)
{
miao=0;
fen++;
if(fen==60)
{
fen=0;
shi++;
if(shi==24)
{
shi=0;
}
write_sfm(3,shi);
}
write_sfm(6,fen);
}
write_sfm(9,miao);
}
}
}
void time0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
j++;
}