<从单片机初学者迈向单片机工程师> 中按键部分实际应用...

2020-02-05 09:09发布

本帖最后由 desgh 于 2012-6-6 17:42 编辑

void GetKey(uint8 *pKeyValue)
{
static uint8 s_u8KeyState = KEY_STATE_INIT ;
static uint8 s_u8KeyTimeCount = 0 ;
static uint8 s_u8LastKey = KEY_NULL ; //保存按键释放时候的键值
uint8 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+按键状态

}

上面是原文，修改了下，大家多多指点：

void GetKey(uint8 *pKeyValue) //获取键值
{
static uint8 s_u8KeyState = KEY_STATE_INIT ;  //
static uint8 s_u8KeyTimeCount = 0 ;    //
static uint8 s_u8LastKey = KEY_NULL ;
uint8 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 :
      {
               s_u8KeyState = KEY_STATE_PRESS ;
      }
      break ;

      case KEY_STATE_PRESS :    //消抖
      {
            if(KEY_NULL != (KeyTemp) )
            {
            s_u8LastKey = KeyTemp ; //保存键值

            s_u8LastKey |= KEY_DOWN ;
            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 ;
                  s_u8LastKey &= 0x0f;
                  s_u8LastKey |= KEY_LONG ;
                  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 ;
      s_u8LastKey &= 0x0f;
                  s_u8LastKey |= KEY_CONTINUE ;
               }
         }
         else
         {
            s_u8KeyState = KEY_STATE_RELEASE ;
         }
      }
      break ;

      case KEY_STATE_RELEASE :
      {

         KeyTemp = s_u8LastKey ;
         s_u8LastKey |= KEY_UP ;
         s_u8KeyState = KEY_STATE_INIT ;
      }
      break ;

      default : break;

}
*pKeyValue = KeyTemp ; //返回键值

}

还望各位多交流交流！

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