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#include<stc15w202s.h>
#include<stdio.h>
#define key_state_0 0
#define key_state_1 1
#define key_state_2 2
#define key_state_3 3
#define key_no 0
#define key_click 1
#define key_double 2
#define key_long 3
sbit KEY = P3^3;
sbit LED_E1P = P3^1;
sbit LED_G1 = P3^2;
sbit LED2 = P5^5; //W2OUT
sbit LED3 = P5^4;
unsigned char flag;
unsigned char cnt = 0;
static unsigned char key_driver(void)
{
static unsigned char key_state_buffer1 = key_state_0;
static unsigned char key_timer_cnt1 = 0;
unsigned char key_return = key_no;
unsigned char key;
key = KEY; //read the I/O states
switch(key_state_buffer1)
{
case key_state_0:
if(key == 0)
key_state_buffer1 = key_state_1;
//按鍵被按下，狀態轉換到按鍵消抖和確認狀態//
break;
case key_state_1:
if(key == 0)
{
key_timer_cnt1 = 0;
key_state_buffer1 = key_state_2;
//按鍵仍然處于按下狀態
//消抖完成，key_timer開始準備計時
//狀態切換到按下時間計時狀態
}
else
key_state_buffer1 = key_state_0;
//按鍵已經抬起，回到按鍵初始狀態
break; //完成軟件消抖
case key_state_2:
if(key == 1)
{
key_return = key_click; //按鍵抬起，產生一次click操作
key_state_buffer1 = key_state_0; //轉換到按鍵初始狀態
}
else if(++key_timer_cnt1 >= 100) //按鍵繼續按下，計時超過1000ms
{
key_return = key_long; //送回長按事件
key_state_buffer1 = key_state_3; //轉換到等待按鍵釋放狀態
}
break;
case key_state_3: //等待按鍵釋放
if(key == 1) //按鍵釋放
key_state_buffer1 = key_state_0; //切回按鍵初始狀態
break;
}
return key_return;
}
unsigned char key_read(void)
{
static unsigned char key_state_buffer2 = key_state_0;
static unsigned char key_timer_cnt2 = 0;
unsigned char key_return = key_no;
unsigned char key;
key = key_driver();
switch(key_state_buffer2)
{
case key_state_0:
if(key == key_click)
{
key_timer_cnt2 = 0; //第一次單擊，不返回，到下個狀態判斷是否會出現雙擊
key_state_buffer2 = key_state_1;
}
else
key_return = key; //對于無鍵、長按，返回原事件
break;
case key_state_1:
if(key == key_click) //又一次單擊，時間間隔小于500ms
{
key_return = key_double; //返回雙擊事件，回到初始狀態
key_state_buffer2 = key_state_0;
}
else if(++key_timer_cnt2 >= 50)
{
//這里在下一次的按鍵來臨之前，并且時間是小于500ms的時候，就會一直執行的是這個key_timer_cnt2++.直到下一次的按鍵到來，再判斷看是雙擊還是單擊。
//這里500ms內肯定讀到的都是無鍵事件，因為長按大于1000ms
//在1s前底層返回的都是無鍵
key_return = key_click; //500ms內沒有再次出現單擊事件，返回單擊事件
key_state_buffer2 = key_state_0; //返回初始狀態
}
break;
}
return key_return;
}
void Timer0Init(void) //1毫秒@11.0592MHz
{
AUXR |= 0x80; //定時器時鐘1T模式
TMOD &= 0xF0; //設置定時器模式
TL0 = 0xCD; //設置定時初值
TH0 = 0xD4; //設置定時初值
TF0 = 0; //清除TF0標志
TR0 = 1; //定時器0開始計時
ET0 = 1;
}
void IO_init()
{
P3M0 = 0x01;
P3M1 = 0x01;
P5M0 = 0x00;
P5M1 = 0x00;
}
void main(void)
{
unsigned char key = 1;
Timer0Init();
IO_init();
LED_E1P = 1;
LED_G1 = 1;
LED2 = 1;
LED3 = 0;
EA = 1;
while(1)
{
if(flag)
{
flag=0;
key = key_read();
switch(key)
{
case key_click:LED2 = !LED2; break;
case key_double:LED2 = !LED2;LED3 = !LED3; break;
case key_long: LED2 = 1; LED3 = 1; LED_G1 = 0; LED_E1P = 0; break;
default : break;
}
}
}
}
void Timr0_ISR() interrupt 1
{
cnt++;
if(cnt>=10)
{
cnt = 0;
flag = 1;
}
}

復制代碼

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