root@R2D2:/home/roberth # usbconfig -d 0.5 dump_curr_config_desc dump_device_desc
ugen0.5: <M2Tech USB Audio 2.0 M2Tech> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON

  bLength = 0x0012
  bDescriptorType = 0x0001
  bcdUSB = 0x0200
  bDeviceClass = 0x00ef
  bDeviceSubClass = 0x0002
  bDeviceProtocol = 0x0001
  bMaxPacketSize0 = 0x0040
  idVendor = 0x249c
  idProduct = 0x930b
  bcdDevice = 0x0210
  iManufacturer = 0x0001  <M2Tech >
  iProduct = 0x0002  <M2Tech USB Audio 2.0>
  iSerialNumber = 0x0003  <0000>
  bNumConfigurations = 0x0002


 Configuration index 0

    bLength = 0x0009
    bDescriptorType = 0x0002
    wTotalLength = 0x00b9
    bNumInterfaces = 0x0003
    bConfigurationValue = 0x0001
    iConfiguration = 0x0000  <no string>
    bmAttributes = 0x0080
    bMaxPower = 0x00fa

    Additional Descriptor

    bLength = 0x08
    bDescriptorType = 0x0b
    bDescriptorSubType = 0x00
     RAW dump:
     0x00 | 0x08, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x20, 0x00


    Interface 0
      bLength = 0x0009
      bDescriptorType = 0x0004
      bInterfaceNumber = 0x0000
      bAlternateSetting = 0x0000
      bNumEndpoints = 0x0001
      bInterfaceClass = 0x0001
      bInterfaceSubClass = 0x0001
      bInterfaceProtocol = 0x0020
      iInterface = 0x0002  <M2Tech USB Audio 2.0>

      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump:
       0x00 | 0x09, 0x24, 0x01, 0x00, 0x02, 0x08, 0x48, 0x00,
       0x08 | 0x00

      Additional Descriptor

      bLength = 0x08
      bDescriptorType = 0x24
      bDescriptorSubType = 0x0a
       RAW dump:
       0x00 | 0x08, 0x24, 0x0a, 0x29, 0x03, 0x07, 0x00, 0x09


      Additional Descriptor

      bLength = 0x08
      bDescriptorType = 0x24
      bDescriptorSubType = 0x0b
       RAW dump:
       0x00 | 0x08, 0x24, 0x0b, 0x28, 0x01, 0x29, 0x03, 0x08


      Additional Descriptor

      bLength = 0x11
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump:
       0x00 | 0x11, 0x24, 0x02, 0x02, 0x01, 0x01, 0x00, 0x28,
       0x08 | 0x02, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00,
       0x10 | 0x06

      Additional Descriptor

      bLength = 0x12
      bDescriptorType = 0x24
      bDescriptorSubType = 0x06
       RAW dump:
       0x00 | 0x12, 0x24, 0x06, 0x0a, 0x02, 0x0f, 0x00, 0x00,
       0x08 | 0x00, 0x0f, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00,
       0x10 | 0x00, 0x00


      Additional Descriptor

      bLength = 0x0c
      bDescriptorType = 0x24
      bDescriptorSubType = 0x03
       RAW dump:
       0x00 | 0x0c, 0x24, 0x03, 0x14, 0x01, 0x03, 0x00, 0x0a,
       0x08 | 0x28, 0x00, 0x00, 0x00


     Endpoint 0
        bLength = 0x0007
        bDescriptorType = 0x0005
        bEndpointAddress = 0x0084  <IN>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0006
        bInterval = 0x0008
        bRefresh = 0x0000
        bSynchAddress = 0x0000


    Interface 1
      bLength = 0x0009
      bDescriptorType = 0x0004
      bInterfaceNumber = 0x0001
      bAlternateSetting = 0x0000
      bNumEndpoints = 0x0000
      bInterfaceClass = 0x0001
      bInterfaceSubClass = 0x0002
      bInterfaceProtocol = 0x0020
      iInterface = 0x0004  <M2Tech USB 2.0 Audio Out>


    Interface 1 Alt 1
      bLength = 0x0009
      bDescriptorType = 0x0004
      bInterfaceNumber = 0x0001
      bAlternateSetting = 0x0001
      bNumEndpoints = 0x0002
      bInterfaceClass = 0x0001
      bInterfaceSubClass = 0x0002
      bInterfaceProtocol = 0x0020
      iInterface = 0x0004  <M2Tech USB 2.0 Audio Out>

      Additional Descriptor

      bLength = 0x10
      bDescriptorType = 0x24
      bDescriptorSubType = 0x01
       RAW dump:
       0x00 | 0x10, 0x24, 0x01, 0x02, 0x00, 0x01, 0x01, 0x00,
       0x08 | 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x0f


      Additional Descriptor

      bLength = 0x06
      bDescriptorType = 0x24
      bDescriptorSubType = 0x02
       RAW dump:
       0x00 | 0x06, 0x24, 0x02, 0x01, 0x04, 0x18


     Endpoint 0
        bLength = 0x0007
        bDescriptorType = 0x0005
        bEndpointAddress = 0x0001  <OUT>
        bmAttributes = 0x0005  <ASYNC-ISOCHRONOUS>
        wMaxPacketSize = 0x0400
        bInterval = 0x0001
        bRefresh = 0x0000
        bSynchAddress = 0x0000

      Additional Descriptor

      bLength = 0x08
      bDescriptorType = 0x25
      bDescriptorSubType = 0x01
       RAW dump:
       0x00 | 0x08, 0x25, 0x01, 0x00, 0x00, 0x02, 0x08, 0x00


     Endpoint 1
        bLength = 0x0007
        bDescriptorType = 0x0005
        bEndpointAddress = 0x0081  <IN>
        bmAttributes = 0x0011  <ISOCHRONOUS>
        wMaxPacketSize = 0x0004
        bInterval = 0x0004
        bRefresh = 0x0000
        bSynchAddress = 0x0000


    Interface 2
      bLength = 0x0009
      bDescriptorType = 0x0004
      bInterfaceNumber = 0x0002
      bAlternateSetting = 0x0000
      bNumEndpoints = 0x0000
      bInterfaceClass = 0x00fe
      bInterfaceSubClass = 0x0001
      bInterfaceProtocol = 0x0001
      iInterface = 0x000c  <M2Tech DFU>

      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x21
      bDescriptorSubType = 0x07
       RAW dump:
       0x00 | 0x09, 0x21, 0x07, 0xfa, 0x00, 0x40, 0x00, 0x10,
       0x08 | 0x01