51單片機(jī)識別四個(gè)獨(dú)立按鍵是短按還是長按

作者：時(shí)間：2014-01-13 來源：網(wǎng)絡(luò)

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這是一個(gè)可以識別四個(gè)獨(dú)立按鍵是短按還是長按的參考程序，此程序已編譯通過，初學(xué)者可以移植到51單片機(jī)上試試．

/********************************************/
//FileName:識別四個(gè)獨(dú)立按鍵是短按還是長按
//Function: 不同按鍵短按或長按分別顯示不同的LED
//author:liu yong
//QQ:545018331
//Date:2013/03/13
/********************************************/
#include PIC.H>
__CONFIG(0X3B31);
#define uint8 unsigned char
unsigned int time_10ms_ok=0;
uint8 KeyValue;
bit KeyShortpressFlag,KeyLongpressFlag;

//＝＝＝＝＝＝＝＝＝定義長按鍵斷口的TICK數(shù)及連發(fā)間隔的TICK數(shù)＝＝＝＝＝＝＝//
#define KEY_LONG_PERIOD 200

//＝＝＝＝＝＝＝＝＝定義按鍵斷口＝＝＝＝＝＝＝//
#define io_key_1 RB0
#define io_key_2 RB1
#define io_key_3 RB2
#define io_key_4 RB3

//＝＝＝＝＝＝＝＝＝定義按鍵鍵值＝＝＝＝＝＝＝//
#define KEY_VALUE_1 0X0e
#define KEY_VALUE_2 0X0d
#define KEY_VALUE_3 0X0b
#define KEY_VALUE_4 0X07
#define KEY_NULL 0X0f

//＝＝＝＝＝＝＝＝＝定義按鍵返回值狀態(tài)（按下，長按，連發(fā)，釋放）＝＝＝＝＝＝＝//
#define KEY_SHORT 0X80
#define KEY_LONG 0X40

//＝＝＝＝＝＝＝＝＝定義按鍵狀態(tài)＝＝＝＝＝＝＝//
#define KEY_STATE_INIT 0
#define KEY_STATE_WOBBLE 1
#define KEY_STATE_PRESS 2
#define KEY_STATE_LONG 3
#define KEY_STATE_RELEASE 4

void initial(void)
{
TRISB=0xff;
TRISC=0;
PORTC=0XFF;
RBPU=0;
T1CON=0X01;//1:1
TMR1H=-(10000 >> 8);
TMR1L=-(10000 0XFF);
TMR1IF=0;
TMR1IE=1;
INTCON=0XC0;
}

void interrupt timer1_isr(void) // 定時(shí)器10ms中斷服務(wù)
{
if(TMR1IF)
{
TMR1H=-(10000 >> 8);
TMR1L=-(10000 0XFF);
time_10ms_ok = 1;
TMR1IF=0;
}
}

void KeyInit(void)
{
io_key_1 = 1;
io_key_2 = 1;
io_key_3 = 1;
io_key_4 = 1;
}

uint8 KeyScan(void)
{
if(io_key_1 == 0)return KEY_VALUE_1;
if(io_key_2 == 0)return KEY_VALUE_2;
if(io_key_3 == 0)return KEY_VALUE_3;
if(io_key_4 == 0)return KEY_VALUE_4;
return KEY_NULL;
}

uint8 GetKey(void)
{
static uint8 s_u8KeyState = KEY_STATE_INIT ;
static uint8 s_u8KeyTimeCount = 0;
uint8 i ;
uint8 KeyTemp=KEY_NULL;
KeyTemp = KeyScan();//0x0e 0f
switch(s_u8KeyState)
{
case KEY_STATE_INIT:
{
if(KEY_NULL != KeyTemp)
{
s_u8KeyState = KEY_STATE_WOBBLE ;
}
}
break;

case KEY_STATE_WOBBLE:
{

s_u8KeyState = KEY_STATE_PRESS ;
}
break;

case KEY_STATE_PRESS://識別哪個(gè)鍵
{
if(KEY_NULL != KeyTemp) // KeyTemp=0x0e short press
{
s_u8KeyState = KEY_STATE_LONG ;
i=KeyTemp;//0x0e
}
else
{
s_u8KeyState = KEY_STATE_INIT;
}
}
break;

case KEY_STATE_LONG: //判斷按鍵是短按還是長按
{
if(KEY_NULL != KeyTemp)
{
if(++s_u8KeyTimeCount > KEY_LONG_PERIOD)
{
s_u8KeyTimeCount = 0;
KeyLongpressFlag=1;
KeyShortpressFlag=0;
s_u8KeyState = KEY_STATE_RELEASE;
}
}
else
{
s_u8KeyTimeCount = 0;
KeyShortpressFlag=1;
KeyLongpressFlag=0;
s_u8KeyState = KEY_STATE_RELEASE;
}
}
break;

case KEY_STATE_RELEASE://按鍵釋放去抖
{
if(KEY_NULL == KeyTemp) //此語句必須加上去不然程序不穩(wěn)定
{
if(KeyShortpressFlag)
{

KeyShortpressFlag=0;
i=i | KEY_SHORT;//0x0e | 0x80=0x8e
s_u8KeyState = KEY_STATE_INIT;
}
if(KeyLongpressFlag)
{
KeyLongpressFlag=0;
i=i | KEY_LONG;
s_u8KeyState = KEY_STATE_INIT;
}
}
}
break;
default:break;
}
return i;
}

void main(void)
{
initial();
KeyInit();
while(1)
{
if (time_10ms_ok) //每10ms執(zhí)行一次，
{
time_10ms_ok =0;
KeyValue=GetKey();
if(KeyValue == (KEY_VALUE_1 | KEY_SHORT)) PORTC = ~1;
if(KeyValue == (KEY_VALUE_1 | KEY_LONG)) PORTC = ~3;
if(KeyValue == (KEY_VALUE_2 | KEY_SHORT))PORTC = ~7;
if(KeyValue == (KEY_VALUE_2 | KEY_LONG)) PORTC = ~0X0F;
if(KeyValue == (KEY_VALUE_3 | KEY_SHORT))PORTC = ~0X1F;
if(KeyValue == (KEY_VALUE_3 | KEY_LONG)) PORTC = ~0X3F;
if(KeyValue == (KEY_VALUE_4 | KEY_SHORT)) PORTC = ~0X7F;
if(KeyValue == (KEY_VALUE_4 | KEY_LONG)) PORTC = ~0XFF;
}
}
}