奇怪的问题，好几天了想不明白！请教高手！

只看该作者 · 2008-10-27 09:27

u8 conhandlePC=0;

//------------------------------------------

void SearchPC(void)
{
   u8 temp;
   u8 countbyte=0;
  while(Uart3.RxOut != Uart3.RxIn)//命令没有查询到头
    {
      temp = Uart3.RxBuffer[Uart3.RxOut];
      Uart3.RxOut = (Uart3.RxOut + 1) & UART2RXBUFFERLENGTH;
      switch(conhandlePC)
      {
      case 0:if( AscK(temp))  conhandlePC=1;else conhandlePC=0;break;
        case 1:if( AscA(temp))  conhandlePC=2;else conhandlePC=0;break;
        case 2:if( AscB(temp))  conhandlePC=3;else conhandlePC=0;break;
        case 3:if( Asc0(temp))  conhandlePC=4;else conhandlePC=0;break;
        case 4:if( Asc0(temp))  conhandlePC=5;else conhandlePC=0;break;
        case 5:if( Asc1(temp))  conhandlePC=6;else conhandlePC=0;break;
        case 6:if( AscR(temp))  conhandlePC=7;else {countbyte=0;conhandlePC=8;PutCharToUart1Single('W');}break;
        case 7:{
                 Read001();
                 Uart3.RxOut=Uart3.RxIn;
                 conhandlePC=0;
                 break;
               }

      case 8: {

              if(countbyte>21)
               {
                 countbyte=0;
                conhandlePC=0;
                 break;
               }
              else
              {

                 PutCharToUart1Single(temp);
                 countbyte++;
                 conhandlePC=8;
                break;


              }



              }

    default :conhandlePC=0;break;
          }

    }
}
//----------------------------------

每次复位后我通过串口助手发送KAB001+23个字节，但是执行完后conhandlePC=8，而不是等于0！还有，如果我把u8 countbyte=0;放在全局变量处，程序就死在void HardFaultException(void)处。想不明白，请高手指点迷津啊