单片机按键控制流水灯代码

好的，这是一个基于C语言的单片机按键控制流水灯的代码示例：

#include <reg51.h>

sbit LED1 = P1^0;
sbit LED2 = P1^1;
sbit LED3 = P1^2;
sbit LED4 = P1^3;

sbit KEY1 = P3^2;
sbit KEY2 = P3^3;

void delay(unsigned int time)
{
    while(time--);
}

void main()
{
    unsigned char cnt = 0;
    unsigned char dir = 0;
    unsigned int speed = 50000;

    KEY1 = 1;
    KEY2 = 1;

    while(1)
    {
        if(KEY1 == 0)
        {
            delay(1000);
            if(KEY1 == 0)
            {
                dir = !dir; //改变方向
            }
            while(KEY1 == 0);
        }

        if(KEY2 == 0)
        {
            delay(1000);
            if(KEY2 == 0)
            {
                speed /= 2; //加快速度
            }
            while(KEY2 == 0);
        }

        if(speed < 1000)
        {
            speed = 50000; //速度上限
        }

        if(cnt == 0)
        {
            LED1 = 1;
            LED4 = 0;
        }
        else if(cnt == 1)
        {
            LED2 = 1;
            LED1 = 0;
        }
        else if(cnt == 2)
        {
            LED3 = 1;
            LED2 = 0;
        }
        else
        {
            LED4 = 1;
            LED3 = 0;
        }

        if(dir == 0)
        {
            cnt = (cnt + 1) % 4;
        }
        else
        {
            cnt = (cnt + 3) % 4;
        }

        delay(speed);
    }
}

这段代码是基于8051单片机的，通过P1口控制LED灯的亮灭，P3口读取按键状态。在主循环中不断扫描按键状态，根据按键的不同操作改变流水灯的运行方向和速度。