请问各位关于枚举的问题，谢谢！！

我的上位机显示的信息是：
Device Descriptor:
bcdUSB:             0x0100
bDeviceClass:         0xDC
bDeviceSubClass:      0x00
bDeviceProtocol:      0x00
bMaxPacketSize0:      0x10 (16)
idVendor:           0x0471 (Philips)
idProduct:          0x0222
bcdDevice:          0x0100
iManufacturer:        0x00
iProduct:             0x00
iSerialNumber:        0x00
bNumConfigurations:   0x01

ConnectionStatus: DeviceConnected
Current Config Value: 0x00
Device Bus Speed:     Full
Device Address:       0x01
Open Pipes:              0
为什么没有打开通道呢？谢谢！