3.3 51单片机-独立按键

#include <reg51.h>
#include "delay.h"
#include "key.h"
#include "type.h"
#include "led.h"

int main()
{
    u8 key; 
    LED=0; //关闭所有LED灯,51单片机默认输出高电平，LED默认高电平点亮
    while(1)
    {
        key=Key_Scan();
        if(key)
        {
            LED=~LED; //控制8盏灯
        }
}
}

#ifndef KEY_H
#define KEY_H
#include <reg51.h>
#include "type.h"
#include "delay.h"
#include "led.h"
u8 Key_Scan(void);
#define KEY P1  //定义按键
sbit key1=KEY^0;
sbit key2=KEY^1;
sbit key3=KEY^2;
sbit key4=KEY^3;
sbit key5=KEY^4;
sbit key6=KEY^5;
sbit key7=KEY^6;
sbit key8=KEY^7;
#endif

#include "key.h"
/*
按键扫描函数
*/
u8 Key_Scan(void)
{
    static u8 flag=0;
    if((KEY!=0xFF)&&(flag==0)) //判断有没有按键按下
    {
        DelayMs(20); //消抖
        flag=1; //标志按键已经被按下
        if(key1==0)return 1;
        if(key2==0)return 2;
        if(key3==0)return 3;
        if(key4==0)return 4;
        if(key5==0)return 5;
        if(key6==0)return 6;
        if(key7==0)return 7;
        if(key8==0)return 8;
    }
    else if(KEY==0xFF) //判断按键是否全部松开
    {
        flag=0; //清除按下标志位
    }
    return 0;
}

#ifndef LED_H
#define LED_H
#include <reg51.h>
#include "type.h"
#include "delay.h"

#define LED P0  //定义LED引脚
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;
#endif

#ifndef TYPE_H
#define TYPE_H
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
#endif