在使用开发板的过程中，打开dnw软件后，能够显示com2,115200bps USB:OK
点击“USB PORT”里的“status”，出现如下一段提示：
===== USB DEVICE STATUS =====
USB_CONFIGURATION_DESCRIPTOR
bLength = 0x9, decimal 9
bDescriptorType = 0x2 ( USB_CONFIGURATION_DESCRIPTOR_TYPE )
wTotalLength = 0x20, decimal 32
bNumInterfaces = 0x1, decimal 1
bConfigurationValue = 0x1, decimal 1
iConfiguration = 0x0, decimal 0
bmAttributes = 0xc0 ( ??? UNKNOWN!! )
MaxPower = 0x19, decimal 25
-----------------------------
USB_INTERFACE_DESCRIPTOR #0
bLength = 0x9
bDescriptorType = 0x4 ( USB_INTERFACE_DESCRIPTOR_TYPE )
bInterfaceNumber = 0x0
bAlternateSetting = 0x0
bNumEndpoints = 0x2
bInterfaceClass = 0xff
bInterfaceSubClass = 0x0
bInterfaceProtocol = 0x0
bInterface = 0x0
-----------------------------
USB_ENDPOINT_DESCRIPTOR for Pipe00
bLength = 0x7
bDescriptorType = 0x5 ( USB_ENDPOINT_DESCRIPTOR_TYPE )
bEndpointAddress= 0x81 ( INPUT )
bmAttributes= 0x2 ( USB_ENDPOINT_TYPE_BULK )
wMaxPacketSize= 0x20, decimal 32
bInterval = 0x0, decimal 0
-----------------------------
USB_ENDPOINT_DESCRIPTOR for Pipe01
bLength = 0x7
bDescriptorType = 0x5 ( USB_ENDPOINT_DESCRIPTOR_TYPE )
bEndpointAddress= 0x3 ( OUTPUT )
bmAttributes= 0x2 ( USB_ENDPOINT_TYPE_BULK )
wMaxPacketSize= 0x20, decimal 32
bInterval = 0x0, decimal 0
-----------------------------
但是dnw界面却没有任何信息，请问这个问题该如何解决。我已经调试很久了，就是解决不了。
