用移位运算法将AT89C51单片机P1P2端口16个灯(P1.0P1.1P1.2P1.3点亮熄灭)(P1.4P1.5P1.6P1.7点亮熄灭)(P2.0P2.1P2.2P2.3点亮熄灭)(P2.4P2.5P2.6P2.7点亮熄灭)循环

以下是用移位运算法实现的代码：

#include <reg51.h>

void delay(unsigned int t)
{
    unsigned int i, j;
    for (i = 0; i < t; i++)
        for (j = 0; j < 1000; j++);
}

void main()
{
    unsigned char i, j;
    while (1)
    {
        // 点亮P1.0-P1.3
        for (i = 0; i < 16; i++)
        {
            P1 = ~(1 << i);
            delay(500);
        }
        // 熄灭P1.0-P1.3
        for (i = 0; i < 16; i++)
        {
            P1 = ~(1 << i);
            delay(500);
        }
        // 点亮P1.4-P1.7
        for (i = 4; i < 8; i++)
        {
            P1 = ~(1 << i);
            delay(500);
        }
        // 熄灭P1.4-P1.7
        for (i = 4; i < 8; i++)
        {
            P1 = ~(1 << i);
            delay(500);
        }
        // 点亮P2.0-P2.3
        for (i = 0; i < 4; i++)
        {
            P2 = ~(1 << i);
            delay(500);
        }
        // 熄灭P2.0-P2.3
        for (i = 0; i < 4; i++)
        {
            P2 = ~(1 << i);
            delay(500);
        }
        // 点亮P2.4-P2.7
        for (i = 4; i < 8; i++)
        {
            P2 = ~(1 << i);
            delay(500);
        }
        // 熄灭P2.4-P2.7
        for (i = 4; i < 8; i++)
        {
            P2 = ~(1 << i);
            delay(500);
        }
    }
}

注：以上代码中的 `delay` 函数用于延时，将会在后续的内容中讲解。