学习状态机遇到了问题，向论坛里的大牛求解，谢谢了！！！
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define KEY_VALUE_1 0xe0
#define KEY_VALUE_2 0xd0
#define KEY_VALUE_3 0xb0
#define KEY_VALUE_4 0x70
#define KEY_NULL 0xf0
sbit io_key_1 = P3^4 ;
sbit io_key_2 = P3^5 ;
sbit io_key_3 = P3^6 ;
sbit io_key_4 = P3^7 ;
static uint 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 KeyInit(void)
{
io_key_1 = 1 ;
io_key_2 = 1 ;
io_key_3 = 1 ;
io_key_4 = 1 ;
}
#define KEY_LONG_PERIOD 100
#define KEY_CONTINUE_PERIOD 25
#define KEY_DOWN 0x08
#define KEY_LONG 0x04
#define KEY_CONTINUE 0x02
#define KEY_UP 0x01
#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
unsigned char timer0_10ms_flag;
void GetKey(uint *pKeyValue)
{
static uint s_u8KeyState = KEY_STATE_INIT ;
static uint s_u8KeyTimeCount = 0 ;
static uint s_u8LastKey = KEY_NULL ; //保存按键释放时候的键值
uint KeyTemp = KEY_NULL;
KeyTemp = KeyScan() ; //获取键值
switch(s_u8KeyState)
{
case KEY_STATE_INIT :
{
if(KEY_NULL != (KeyTemp))
{
s_u8KeyState = KEY_STATE_WOBBLE ;
}
}
break ;
case KEY_STATE_WOBBLE : //消抖
{
s_u8KeyState = KEY_STATE_PRESS ;
}
break ;
case KEY_STATE_PRESS :
{
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 ;
}
else
{
s_u8KeyState = KEY_STATE_INIT ;
}
}
break ;
case KEY_STATE_LONG :
{
if(KEY_NULL != (KeyTemp))
{
if(++s_u8KeyTimeCount > KEY_LONG_PERIOD)
{
s_u8KeyTimeCount = 0 ;
KeyTemp |= KEY_LONG ; //长按键事件发生
s_u8KeyState = KEY_STATE_CONTINUE ;
}
}
else
{
s_u8KeyState = KEY_STATE_RELEASE ;
}
}
break ;
case KEY_STATE_CONTINUE :
{
if(KEY_NULL != (KeyTemp))
{
if(++s_u8KeyTimeCount > KEY_CONTINUE_PERIOD)
{
s_u8KeyTimeCount = 0 ;
KeyTemp |= KEY_CONTINUE ;
}
}
else
{
s_u8KeyState = KEY_STATE_RELEASE ;
}
}
break ;
case KEY_STATE_RELEASE :
{
s_u8LastKey |= KEY_UP ;
KeyTemp = s_u8LastKey ;
s_u8KeyState = KEY_STATE_INIT ;
}
break ;
default : break ;
}
*pKeyValue= KeyTemp ; //返回键值
}
void init()
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
timer0_10ms_flag=1;
}
void mian()
{
uint KeyValue=KEY_NULL;
init();
KeyInit();
while(1)
{
Timer0MainLoop();
KeyMainLoop(&KeyValue);
if(KeyValue == (KEY_VALUE_1 | KEY_DOWN)) P1 = ~1 ;
if(KeyValue == (KEY_VALUE_1 | KEY_LONG)) P1 = ~2 ;
if(KeyValue == (KEY_VALUE_1 | KEY_CONTINUE)) { P1 ^= 0xf0;}
if(KeyValue == (KEY_VALUE_1 | KEY_UP)) P1 = 0xa5 ;
}
}
下面的两个函数怎么来的
Timer0MainLoop();
KeyMainLoop(&KeyValue);
具体的内容是什么？？
向大牛求解。
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楼主
