51单片机利用左移运算制作一组IO流水灯

51单片机利用左移运算制作一组IO流水灯

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• Proteus仿真
  

实例代码

#include <REGX52.H>

//毫秒级延时
void delay(unsigned int z)
{
    unsigned x,y;
    for(x=z; x>>0; x--)
        for(y=110; y>>0; y--);
}
void main() {
    static int i=0;
    while(1) {
        P2=~(1<<i);
        i++;
        delay(800);
        if(i==7) {
            P2=~(1<<7);//先让i=7执行P2=0x7f(0111 1111)再执行i%=7操作，不然P27只会量一次
            delay(800);
            i%=7;//当i等于7时，让i等于0
        }
    }
}

实现左移后右移动流水灯效果

#include<reg52.h>
//毫秒级延时
void delay(unsigned int z)
{
    unsigned x,y;
    for(x=z; x>>0; x--)
        for(y=110; y>>0; y--);
}

void main() {
	
	int i = 0;
	unsigned count = 0;
	unsigned char flag = 0;
	P2 = 0x01;
	
	while(1) {
		if(flag%2 == 0) {
			P2 = ~(0x01 << count);//从P20到P27，依次点亮
		} else {
			P2 = ~(0x80 >> count);//从P27到P20，依次点亮
		}
		delay(800);
		count++;
		if(count >= 8) {
			count = 1;
			flag++;
		}
	}
}

• 仿真效果
  

利用intrins.h头文件中的左移和右移函数实现

#include <REGX52.H>
#include <intrins.h>
//毫秒级延时
void delay(unsigned int z)
{
    unsigned x,y;
    for(x=z; x>>0; x--)
        for(y=110; y>>0; y--);
}
void main(){
	unsigned char temp,i;
	
        temp = 0XFE;

        while(1)
        {
           for(i = 0; i < 7;i++)
                {
                    P2 = temp;
                        temp = \_crol\_(temp,1);         
                        delay(800);//500ms延时 11.0592MHZ
                }

                for(i = 0; i < 7;i++)
                {                              
                    P2 = temp;
                        temp = \_cror\_(temp,1);
                        delay(800);//500ms延时 11.0592MHZ
                }
}
	}