clock.c

数字钟

#include <reg52.H>
sbit P3_2=P3^5;sbit P3_3=P3^4;sbit P3_4=P3^3;
unsigned char code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90
,0x77,0x7c,
0x39,0x5e,0x79,0x71,0x00};
unsigned char dispbitcode[]={0xf9,0xf5,0xed,0xdd,
0xbd,0x7d,0xfd,0xfd};
unsigned char dispbuf[8]={0,0,16,0,0,16,0,0};
unsigned char dispbitcnt;

unsigned char second;
unsigned char minite;
unsigned char hour;
unsigned int tcnt;
unsigned char mstcnt;

unsigned char i,j;

void main(void)
{
TMOD=0x02;
TH0=0x06;
TL0=0x06;
TR0=1;
ET0=1;
EA=1;

while(1)
{
if(P3_2==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P3_2==0)
{
second++;
if(second==60)
{
second=0;
}
dispbuf[0]=second%10;
dispbuf[1]=second/10;
while(P3_2==0);
}
}
if(P3_3==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P3_3==0)
{
minite++;
if(minite==60)
{
minite=0;
}
dispbuf[2]=minite%10;
dispbuf[3]=minite/10;
while(P3_3==0);
}
}
if(P3_4==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P3_4==0)
{
hour++;
if(hour==24)
{
hour=0;
}
dispbuf[4]=hour%10;
dispbuf[5]=hour/10;
while(P3_4==0);
}
}
}
}
void t0(void) interrupt 1 using 0
{
mstcnt++;
if(mstcnt==8)
{
mstcnt=0;
P0=dispcode[dispbuf[dispbitcnt]];
P2=dispbitcode[dispbitcnt];
dispbitcnt++;
if(dispbitcnt==8)
{
dispbitcnt=0;
}
}
tcnt++;
if(tcnt==4000)
{
tcnt=0;
second++;
if(second==60)
{
second=0;
minite++;
if(minite==60)
{
minite=0;
hour++;
if(hour==24)
{
hour=0;
}
}
}
dispbuf[0]=second%10;
dispbuf[1]=second/10;
dispbuf[2]=minite%10;
dispbuf[3]=minite/10;
dispbuf[4]=hour%10;
dispbuf[5]=hour/10;
}
}