case HOST_ENUMERATION:
	  {
		  static uint16_t failedTimes = 0; //增加计数器，避免一直枚举而无法检测USB拔出状态
		  /* Check for enumeration status */
		  status = USBH_HandleEnum(phost);
		  if (status == USBH_OK)
		  {
			  failedTimes = 0;
			/* The function shall return USBH_OK when full enumeration is complete */
			USBH_UsrLog("Enumeration done.");

			phost->device.current_interface = 0U;

			if (phost->device.DevDesc.bNumConfigurations == 1U)
			{
			  USBH_UsrLog("This device has only 1 configuration.");
			  phost->gState = HOST_SET_CONFIGURATION;
			}
			else
			{
			  phost->gState = HOST_INPUT;
			}
#if (USBH_USE_OS == 1U)
			phost->os_msg = (uint32_t)USBH_STATE_CHANGED_EVENT;
#if (osCMSIS < 0x20000U)
			(void)osMessagePut(phost->os_event, phost->os_msg, 0U);
#else
			(void)osMessageQueuePut(phost->os_event, &phost->os_msg, 0U, NULL);
#endif
#endif
		  }
		  else
		  {
			  failedTimes++;
			  if(failedTimes >= 3000)
			  {
				  failedTimes = 0;
				  phost->gState = HOST_IDLE;
				  //phost->gState = HOST_ABORT_STATE;
				  //phost->gState = HOST_DEV_DISCONNECTED;
				  USBH_Stop(phost);
				  USBH_Start(phost); //重启USB控制器
			  }
		  }
		  break;
	  }