clock.c

本文件包含了使用C语言编写单片机的各种入门程序

#include<reg51.h>
sbit sda=P0^2;
sbit scl=P0^3;
unsigned int hour,minute,second,b;
code unsigned int led[11]={0x11,0xd7,0x32,
0x92,0xd4,0x98,0x18,0xd3,0x10,0x90,0xff};

void delay(int i)
{
int y;
for(;i>0;i--)
for(y=0;y<400;y++);
}

shift(int t)
{
int n,led1=led[t];
for(n=0;n<8;n++)
{
scl=0;
if(led1&0x80)sda=1;
else sda=0;
scl=1;
scl=0;
sda=0;
led1=led1<<1;
}
}

display()
{
b=second%10;
shift(b);
b=second/10;
shift(b);

b=0x0a;
shift(b);

b=minute%10;
shift(b);
b=minute/10;
shift(b);

b=0x0a;
shift(b);

b=hour%10;
shift(b);
b=hour/10;
shift(b);
}

void main()
{
delay(200);
for(hour=0;hour<24;hour++)
{
for(minute=0;minute<60;minute++)
{
for(second=0;second<60;second++)
{
display();
delay(1000);
}
}
}
}