59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
#ifndef _key_H
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#define _key_H
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#include "public.h"
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//定义独立按键控制脚
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sbit KEY1=P3^1;
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sbit KEY2=P3^0;
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sbit KEY3=P3^2;
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sbit KEY4=P3^3;
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//使用宏定义独立按键按下的键值
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#define KEY1_PRESS 1
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#define KEY2_PRESS 2
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#define KEY3_PRESS 3
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#define KEY4_PRESS 4
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#define KEY_UNPRESS 0
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u8 key_scan(u8 mode);
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/*******************************************************************************
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* 函 数 名 : key_scan
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* 函数功能 : 检测独立按键是否按下，按下则返回对应键值
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* 输 入 : mode=0：单次扫描按键
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mode=1：连续扫描按键
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* 输 出 : KEY1_PRESS：K1按下
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KEY2_PRESS：K2按下
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KEY3_PRESS：K3按下
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KEY4_PRESS：K4按下
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KEY_UNPRESS：未有按键按下
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*******************************************************************************/
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u8 key_scan(u8 mode)
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{
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static u8 key=1;
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if(mode)key=1;//连续扫描按键
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if(key==1&&(KEY1==0||KEY2==0||KEY3==0||KEY4==0))//任意按键按下
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{
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delay_10us(1000);//消抖
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key=0;
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if(KEY1==0)
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return KEY1_PRESS;
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else if(KEY2==0)
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return KEY2_PRESS;
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else if(KEY3==0)
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return KEY3_PRESS;
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else if(KEY4==0)
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return KEY4_PRESS;
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}
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else if(KEY1==1&&KEY2==1&&KEY3==1&&KEY4==1) //无按键按下
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{
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key=1;
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}
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return KEY_UNPRESS;
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}
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#endif |