流水灯 外侧<->中间<->外侧

/*
//side<-center->side
//side->center<-side
//loop
*//
#include "reg52.h"

void delay(unsigned int cnt);
    
void main(void)
{
    //
    unsigned char led_1[] = {0XE7,0XDB,0XBD,0X7E};
    unsigned int x;
    for(x=0;x<4;x++)
    {
        //
        P1=led_1[x];
        delay(6000);
    }
    for(x=3;x>=1;x--)
    {
        //
        P1=led_1[x];
        delay(6000);
    }
}

void delay(unsigned int cnt)
    {
        //
        while(--cnt);
    }