USB Custom_HID例程有Bug? LED控制部分

只看该作者 · 2009-10-2 12:12

USB Custom_HID例程有Bug? USB库是V3.0.1的， LED控制部分反复测试一段时间，程序就无法控制LED了，仿真发现不能进入 EP1_OUT_Callback(),大家帮忙分析一下吧。

下面是进入回调函数前的中断处理代码：
/*******************************************************************************
* Function Name  : CTR_LP.
* Description : Low priority Endpoint Correct Transfer interrupt's service
*                routine.
* Input       : None.
* Output       : None.
* Return       : None.
*******************************************************************************/
void CTR_LP(void)
{
  uint32_t wEPVal = 0;
  /* stay in loop while pending ints */
  while (((wIstr = _GetISTR()) & ISTR_CTR) != 0)
  {
_SetISTR((uint16_t)CLR_CTR); /* clear CTR flag */
/* extract highest priority endpoint number */
EPindex = (uint8_t)(wIstr & ISTR_EP_ID);
if (EPindex == 0)
{
   /* Decode and service control endpoint interrupt */
   /* calling related service routine */
   /* (Setup0_Process, In0_Process, Out0_Process) */
   /* save RX & TX status */
   /* and set both to NAK */
   SaveRState = _GetEPRxStatus(ENDP0);
   SaveTState = _GetEPTxStatus(ENDP0);
   _SetEPRxStatus(ENDP0, EP_RX_NAK);
   _SetEPTxStatus(ENDP0, EP_TX_NAK);

   /* DIR bit = origin of the interrupt */
   if ((wIstr & ISTR_DIR) == 0)
   {
      /* DIR = 0 */
      /* DIR = 0    => IN  int */
      /* DIR = 0 implies that (EP_CTR_TX = 1) always  */

      _ClearEP_CTR_TX(ENDP0);
      In0_Process();
         /* before terminate set Tx & Rx status */
      _SetEPRxStatus(ENDP0, SaveRState);
      _SetEPTxStatus(ENDP0, SaveTState);
      return;
   }
   else
   {
      /* DIR = 1 */
      /* DIR = 1 & CTR_RX    => SETUP or OUT int */
      /* DIR = 1 & (CTR_TX | CTR_RX) => 2 int pending */
      wEPVal = _GetENDPOINT(ENDP0);
      if ((wEPVal & EP_CTR_TX) != 0)
      {
      _ClearEP_CTR_TX(ENDP0);
      In0_Process();
      /* before terminate set Tx & Rx status */
      _SetEPRxStatus(ENDP0, SaveRState);
      _SetEPTxStatus(ENDP0, SaveTState);
      return;
      }
      else if ((wEPVal &EP_SETUP) != 0)
      {
      _ClearEP_CTR_RX(ENDP0); /* SETUP bit kept frozen while CTR_RX = 1 */
      Setup0_Process();
      /* before terminate set Tx & Rx status */
      _SetEPRxStatus(ENDP0, SaveRState);
      _SetEPTxStatus(ENDP0, SaveTState);
      return;
      }
      else if ((wEPVal & EP_CTR_RX) != 0)
      {
      _ClearEP_CTR_RX(ENDP0);
      Out0_Process();
      /* before terminate set Tx & Rx status */
      _SetEPRxStatus(ENDP0, SaveRState);
      _SetEPTxStatus(ENDP0, SaveTState);
      return;
      }
   }
}/* if(EPindex == 0) */
else
{
   /* Decode and service non control endpoints interrupt  */
   /* process related endpoint register */
   wEPVal = _GetENDPOINT(EPindex);
   if ((wEPVal & EP_CTR_RX) != 0)
   {
      /* clear int flag */
      _ClearEP_CTR_RX(EPindex);
      /* call OUT service function */
      (*pEpInt_OUT[EPindex-1])();
   } /* if((wEPVal & EP_CTR_RX) */
   if ((wEPVal & EP_CTR_TX) != 0)
   {
      /* clear int flag */
      _ClearEP_CTR_TX(EPindex);
      /* call IN service function */
      (*pEpInt_IN[EPindex-1])();
   } /* if((wEPVal & EP_CTR_TX) != 0) */
}/* if(EPindex == 0) else */
  }/* while(...) */
}