仔细看了下
仿真时在主函数while循环USBH_Process(&USB_OTG_Core, &USB_Host);中
case HOST_ENUMERATION:     
    /* Check for enumeration status */  
    if ( USBH_HandleEnum(pdev , phost) == USBH_OK)
    { 
      /* The function shall return USBH_OK when full enumeration is complete */
      
      /* user callback for end of device basic enumeration */
      phost->usr_cb->EnumerationDone();
      
      phost->gState  = HOST_USR_INPUT;    
    }

始终无法进入这个if中去，条件无法满足