再发键盘状态机

只看该作者 · 2011-4-11 14:03

u8 KeyStateMachine(void)
{
if(KeyDone)    //按键对应处理执行了没有
  {
   KeyValue=(GetKeyValue()&NoKeyPressMask);/*检测按键端口获得按键值*/
   switch(CurKeyState)
   {
   case NoKeyPress:
   if(KeyValue!=NoKeyPressMask)
      {
      CurKeyState=KeyDrop;
      }
   else
      {
      #ifdef NoKeyTimeCntEn                //支持无击使能标志
            NoKeyTimeCnt++;             //支持无击计数器增长
         #endif
         KeyValid= 0xff;
      }
   break;
   case KeyDrop:
      if(KeyTempBuf[0]!=KeyTempBuf[1]&&KeyValue==KeyTempBuf[1]&&KeyValue!=NoKeyPressMask)
         {
            CurKeyState=KeyPress;
            KeyAge=0; //年龄计数器清零
         }
         else
         {
            CurKeyState=NoKeyPress;
         }
   break;
   case KeyPress: //此阶段处理长击和连击
      if(KeyTempBuf[0]==KeyTempBuf[1]&&KeyValue==KeyTempBuf[1]&&KeyValue!=NoKeyPressMask)
         {
         KeyAge++;  //年龄计数器累加
         KeyValid= KeyValue;//或者压KEYPADBUF
         }
         else
         {
            CurKeyState=NoKeyPress;
         }
   case KeyRelease:  //此阶段处理键盘弹起
   if(KeyTempBuf[0]==NoKeyPressMask&&KeyTempBuf[1]==NoKeyPressMask&&KeyValue==NoKeyPressMask) //确认弹起
      {
      CurKeyState=NoKeyPress;
      if(KeyAge>=KeyLongPreesLimit)
         SingleKeyLongShortFlag=1;
      else
         SingleKeyLongShortFlag=0;
      KeyAge=0; //年龄计数器清零
      KeyDone=0;  //按键置未处理标志
      KeyTempBuf[0]=KeyTempBuf[1]=KeyValue=0xff;
      }
   break;
   default:
         CurKeyState=NoKeyPress;
   break;
   }
   KeyTempBuf[0]=KeyTempBuf[1];
   KeyTempBuf[1]=KeyValue;
   return KeyValid;
  }
  else{
//键盘扫描无效
return 0xff;
  }
}