51单片机8路抢答器程序代码

以下是基于51单片机的8路抢答器程序代码参考：

#include<reg51.h>

#define uint unsigned int
#define uchar unsigned char

// 8个按键的IO口定义
sbit key1 = P1^0;
sbit key2 = P1^1;
sbit key3 = P1^2;
sbit key4 = P1^3;
sbit key5 = P1^4;
sbit key6 = P1^5;
sbit key7 = P1^6;
sbit key8 = P1^7;

// 八个LED灯的IO口定义
sbit led1 = P2^0;
sbit led2 = P2^1;
sbit led3 = P2^2;
sbit led4 = P2^3;
sbit led5 = P2^4;
sbit led6 = P2^5;
sbit led7 = P2^6;
sbit led8 = P2^7;

// 定义变量，用于记录哪个按键先按下
uchar key_num;
// 定义变量，用于记录是否有按键按下
uchar flag;

void main()
{
    // 初始化按键
    key1 = 1;
    key2 = 1;
    key3 = 1;
    key4 = 1;
    key5 = 1;
    key6 = 1;
    key7 = 1;
    key8 = 1;
    // 初始化LED灯
    led1 = 0;
    led2 = 0;
    led3 = 0;
    led4 = 0;
    led5 = 0;
    led6 = 0;
    led7 = 0;
    led8 = 0;

    while(1)
    {
        // 检测按键是否按下
        if(key1 == 0)
        {
            key_num = 1;
            flag = 1;
        }
        else if(key2 == 0)
        {
            key_num = 2;
            flag = 1;
        }
        else if(key3 == 0)
        {
            key_num = 3;
            flag = 1;
        }
        else if(key4 == 0)
        {
            key_num = 4;
            flag = 1;
        }
        else if(key5 == 0)
        {
            key_num = 5;
            flag = 1;
        }
        else if(key6 == 0)
        {
            key_num = 6;
            flag = 1;
        }
        else if(key7 == 0)
        {
            key_num = 7;
            flag = 1;
        }
        else if(key8 == 0)
        {
            key_num = 8;
            flag = 1;
        }

        // 如果有按键按下
        if(flag == 1)
        {
            // 根据按键的编号点亮对应的LED灯
            switch(key_num)
            {
                case 1:
                    led1 = 1;
                    break;
                case 2:
                    led2 = 1;
                    break;
                case 3:
                    led3 = 1;
                    break;
                case 4:
                    led4 = 1;
                    break;
                case 5:
                    led5 = 1;
                    break;
                case 6:
                    led6 = 1;
                    break;
                case 7:
                    led7 = 1;
                    break;
                case 8:
                    led8 = 1;
                    break;
            }
            // 清空标志位，等待下一次按键按下
            flag = 0;
        }
    }
}

此程序实现了8路抢答器的基本功能。注意，在实际使用中需要根据具体需求进行修改和调整。