Question

51单片机的八个LED循环点亮，如何写代码？

Answer 1

// 51单片机控制八个发光二极管 左右循环。

#include<reg52.h>

#define uchar unsigned char

#define uint unsigned int

unsigned char TAB[]= {0xff,0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xff,0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,0xff}; // 改变这里 LED 各种花样

uchar t,i;

void main()

{

TMOD=0x10;

TH1=(65535-50000)/256;  // 50ms一次

TL1=(65535-50000)%256;

EA=1; 

ET1=1;//开定时器1中断

TR1=1;//启动定时器1

t=0;

i=0;

while(1)

{

}

}

void timer1() interrupt 3

{

TH1=(65535-50000)/256;  // 50ms一次

TL1=(65535-50000)%256;

t++;

if(t==20)

{

t=0;

P2=TAB[i];

i++;

if(i==18) { i=0;}

} 

}