51单片机小灯左循环

以下是51单片机小灯左循环的代码实现：

#include <reg51.h> //导入51的库

sbit led1 = P1^0; //定义小灯1的负极接到的端口，P1.0
sbit led2 = P1^1; //定义小灯2的负极接到的端口，P1.1
sbit led3 = P1^2; //定义小灯3的负极接到的端口，P1.2
sbit led4 = P1^3; //定义小灯4的负极接到的端口，P1.3
sbit led5 = P1^4; //定义小灯5的负极接到的端口，P1.4
sbit led6 = P1^5; //定义小灯6的负极接到的端口，P1.5
sbit led7 = P1^6; //定义小灯7的负极接到的端口，P1.6
sbit led8 = P1^7; //定义小灯8的负极接到的端口，P1.7

void main() //主函数
{
    unsigned int delay;
    while(1){ //死循环防止程序退出
        led1 = 1; //点亮小灯1
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led1 = 0; //熄灭小灯1
        led2 = 1; //点亮小灯2
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led2 = 0; //熄灭小灯2
        led3 = 1; //点亮小灯3
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led3 = 0; //熄灭小灯3
        led4 = 1; //点亮小灯4
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led4 = 0; //熄灭小灯4
        led5 = 1; //点亮小灯5
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led5 = 0; //熄灭小灯5
        led6 = 1; //点亮小灯6
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led6 = 0; //熄灭小灯6
        led7 = 1; //点亮小灯7
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led7 = 0; //熄灭小灯7
        led8 = 1; //点亮小灯8
        delay = 20000; //延时
        while(delay--); //空循环delay次，实现简单延时
        led8 = 0; //熄灭小灯8
    }
}