51单片机流水灯如何闪烁

以下是51单片机流水灯闪烁的代码实现：

#include <reg52.h>

#define uint unsigned int
#define uchar unsigned char

sbit LED1 = P0^0;
sbit LED2 = P0^1;
sbit LED3 = P0^2;
sbit LED4 = P0^3;
sbit LED5 = P0^4;
sbit LED6 = P0^5;
sbit LED7 = P0^6;
sbit LED8 = P0^7;

void delay(uint xms) // 延时函数
{
    uint i, j;
    for (i = xms; i > 0; i--)
        for (j = 110; j > 0; j--);
}

void main()
{
    uchar i;
    while (1)
    {
        for (i = 0; i < 8; i++) // 从左往右流水灯
        {
            switch (i)
            {
                case 0: LED1 = 0; break;
                case 1: LED2 = 0; break;
                case 2: LED3 = 0; break;
                case 3: LED4 = 0; break;
                case 4: LED5 = 0; break;
                case 5: LED6 = 0; break;
                case 6: LED7 = 0; break;
                case 7: LED8 = 0; break;
            }
            delay(100); // 延时100ms
            switch (i)
            {
                case 0: LED1 = 1; break;
                case 1: LED2 = 1; break;
                case 2: LED3 = 1; break;
                case 3: LED4 = 1; break;
                case 4: LED5 = 1; break;
                case 5: LED6 = 1; break;
                case 6: LED7 = 1; break;
                case 7: LED8 = 1; break;
            }
        }
        for (i = 7; i > 0; i--) // 从右往左流水灯
        {
            switch (i)
            {
                case 0: LED1 = 0; break;
                case 1: LED2 = 0; break;
                case 2: LED3 = 0; break;
                case 3: LED4 = 0; break;
                case 4: LED5 = 0; break;
                case 5: LED6 = 0; break;
                case 6: LED7 = 0; break;
                case 7: LED8 = 0; break;
            }
            delay(100); // 延时100ms
            switch (i)
            {
                case 0: LED1 = 1; break;
                case 1: LED2 = 1; break;
                case 2: LED3 = 1; break;
                case 3: LED4 = 1; break;
                case 4: LED5 = 1; break;
                case 5: LED6 = 1; break;
                case 6: LED7 = 1; break;
                case 7: LED8 = 1; break;
            }
        }
    }
}