shuzizuoyi.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 b=0,n;
code unsigned int led[26]={0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0x11,0xd7,
0x32,0x92,0xd4,0x98,0x18,0xd3,0x10,0x90,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,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;
}
}

void main()
{
for(n=0;n<19;n++)
{
b=8+n;
shift(b);
b=7+n;
shift(b);
b=6+n;
shift(b);
b=5+n;
shift(b);
b=4+n;
shift(b);
b=3+n;
shift(b);
b=2+n;
shift(b);
b=1+n;
shift(b);
delay(400);
}
}