0--9999.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 num,b;
code char led[16]={0x11,0x7D,0x23,0x29,0x4D,0x89,0x81,			   // 0  1  2  3  4  5  6
                   0x3D,0x01,0x09,0x05,0xC1,0x93,0x61,0x83,0x87};  // 7  8  9  A  B  C  D  E  F
void delay(int k)
{
int u;
for(;k>0;k--)
for(u=0;u<500;u++)
{; }
}

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=num%10;
shift(b);
b=num%100/10;
shift(b);
b=num%1000/100;
shift(b);
b=num/1000;
shift(b);		  
b=0x0a;
shift(b);
shift(b);
shift(b);
shift(b);
}

void main()
{
delay(200);
for(num=0;num<9999;num++)
{
display();
delay(500);
}
}