51单片机利用左移运算制作一组IO流水灯

Posted 2021-10-08 perseverance52

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);
		} else {
			P2 = ~(0x80 >> count);
		}
		delay(800);
		count++;
		if(count >= 8) {
			count = 1;
			flag++;
		}
	}
}

• 仿真效果