#include
#define uchar unsigned char
//按键端口定义
sbit io_key_1 = P2^0 ;
sbit io_key_2 = P2^1 ;
sbit io_key_3 = P2^2 ;
sbit io_key_4 = P2^3 ;
sbit P30 = P3^0;
sbit P31 = P3^1;
sbit P32 = P3^2;
sbit P33 = P3^3;
//定义长按键的TICK数,以及连_发间隔的TICK数
#define KEY_LONG_PERIOD 100
#define KEY_CONTINUE_PERIOD 20
#define KEY_DOUDONG 20
//定义按键返回值状态(按下,长按,连_发,释放)
#define KEY_DOWN 0x80
#define KEY_LONG 0x40
#define KEY_CONTINUE 0x20
#define KEY_UP 0x10
//定义按键状态
#define KEY_STATE_INIT 0
#define KEY_STATE_WOBBLE 1
#define KEY_STATE_PRESS 2
#define KEY_STATE_LONG 3
#define KEY_STATE_CONTINUE 4
#define KEY_STATE_RELEASE 5
//按键值
#define KEY_VALUE_1 0x0e
#define KEY_VALUE_2 0x0d
#define KEY_VALUE_3 0x0b
#define KEY_VALUE_4 0x07
#define KEY_NULL 0x0f
static uchar s_u8KeyState = KEY_STATE_INIT; //关键状态
static uchar s_u8KeyTimeCount = 0; //关键时间计数
static uchar s_u8LastKey = KEY_NULL; //保存按键释放时候的键值
void delay_nms(unsigned char k)
{
unsigned int i,j;
for(i=0;i
for(j=0;j<120;j++)
;
}
//按键初始化
void KeyInit(void)
{
io_key_1 = 1;
io_key_2 = 1;
io_key_3 = 1;
io_key_4 = 1;
}
//按键扫描
static uchar 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;
}
void GetKey(uchar *pKeyValue)
{
static uchar s_u8KeyState = KEY_STATE_INIT ;
static uchar s_u8KeyTimeCount = 0 ;
static uchar s_u8LastKey = KEY_NULL ; //保存按键释放时候的键值
static uchar s_doudong=0;
uchar KeyTemp = KEY_NULL ;
KeyTemp = KeyScan() ; //获取键值
switch(s_u8KeyState)
{
case KEY_STATE_INIT : //初始化S1状态
{
if(KEY_NULL != (KeyTemp)) //如果有按键按下 进入状态2
{
s_u8KeyState = KEY_STATE_WOBBLE ;
}
}
break ;
case KEY_STATE_WOBBLE : //去抖动S2状态
{
if(++s_doudong==KEY_DOUDONG)
{
s_doudong=0;
s_u8KeyState = KEY_STATE_PRESS ;
}
else
s_u8KeyState = KEY_STATE_WOBBLE;
}
break ;
case KEY_STATE_PRESS : //确认有按键按下S3状态 并返回按键值
{
if(KEY_NULL != (KeyTemp))
{
s_u8LastKey = KeyTemp ; //保存键值,以便在释放按键状态返回键值
KeyTemp |= KEY_DOWN ; //按键按下
s_u8KeyState = KEY_STATE_LONG ; //保存下次进入长按状态
}
else //如果没有按键按下 返回初始化S1
{
s_u8KeyState = KEY_STATE_INIT ;
}
}
break ;
case KEY_STATE_LONG : //进入长按
{
if(KEY_NULL != (KeyTemp)) //确认有按键按下 计数
{
if(++s_u8KeyTimeCount > KEY_LONG_PERIOD) //到达阀值 返回长按键值
{
s_u8KeyTimeCount = 0 ;
KeyTemp |= KEY_LONG ; //长按键事件发生
s_u8KeyState = KEY_STATE_LONG ; //保存下次进入
}
}
else
{
s_u8KeyState = KEY_STATE_RELEASE ; //长按状态 按键放开
}
}
break ;
case KEY_STATE_CONTINUE : //连发状态
{
if(KEY_NULL != (KeyTemp))
{
if(++s_u8KeyTimeCount > KEY_CONTINUE_PERIOD)
{
s_u8KeyTimeCount = 0 ;
KeyTemp |= KEY_CONTINUE ;
}
}
else //如果没有按键 直接返回按键
{
s_u8KeyState = KEY_STATE_RELEASE ;
}
}
break ;
case KEY_STATE_RELEASE : //短按返回
{
s_u8LastKey |= KEY_UP ;
KeyTemp = s_u8LastKey ;
s_u8KeyState = KEY_STATE_INIT ;
}
break ;
default : break ;
}
*pKeyValue = KeyTemp ; //返回键值
}
void Key_Proc(uchar key_value)
{
switch(key_value)
{
case KEY_VALUE_1 | KEY_DOWN:
P3=0X0f; //0000 1111
delay_nms(500);
break;
case KEY_VALUE_1 | KEY_LONG:
P3 = 0xf0; //1111 0000
break;
case KEY_VALUE_1 | KEY_UP:
P3 = 0x33; //0011 0011
break;
default:
break;
}
}
void main(void)
{
uchar KeyValue = KEY_NULL;
KeyInit();
P2=0xff;
P3=0x00;
while(1)
{
GetKey(&KeyValue) ;
Key_Proc(KeyValue);
}
}
