Thesycon.de has a little tool called tdd.exe that reports the details of a device’s USB descriptor on Windows. When I run that tool on a Polyend Mess, it reports errors in the descriptor. Here is its output:
Information for device Mess (VID=0x16D0 PID=0x111C):
*** ERROR: Descriptor has errors! ***
Connection Information:
Device current bus speed: HighSpeed
Device supports USB 1.1 specification
Device supports USB 2.0 specification
Device address: 0x002A
Current configuration value: 0x01
Number of open pipes: 2
Device Descriptor:
0x12 bLength
0x01 bDescriptorType
0x0200 bcdUSB
0xEF bDeviceClass (Miscellaneous device)
0x02 bDeviceSubClass
0x01 bDeviceProtocol
0x40 bMaxPacketSize0 (64 bytes)
0x16D0 idVendor
0x111C idProduct
0x0101 bcdDevice
0x01 iManufacturer “Polyend”
0x02 iProduct “Mess”
0x00 iSerialNumber
0x01 bNumConfigurations
Device Qualifier Descriptor is not available. Error code: 0x0000001F
Configuration Descriptor:
0x09 bLength
0x02 bDescriptorType
0x0053 wTotalLength (83 bytes)
0x01 bNumInterfaces
0x01 bConfigurationValue
0x00 iConfiguration
0x80 bmAttributes (Bus-powered Device)
0x32 bMaxPower (100 mA)
Interface Descriptor:
0x09 bLength
0x04 bDescriptorType
0x00 bInterfaceNumber
0x00 bAlternateSetting
0x02 bNumEndPoints
0x01 bInterfaceClass (Audio Device Class)
0x03 bInterfaceSubClass (MIDI Streaming Interface)
0x00 bInterfaceProtocol (Audio Protocol undefined)
0x00 iInterface
MS Interface Header Descriptor:
0x07 bLength
0x24 bDescriptorType
0x01 bDescriptorSubtype
0x0001 bcdMSC
0x0025 wTotalLength (37 bytes)
MS MIDI IN Jack Descriptor:
0x06 bLength
0x24 bDescriptorType
0x02 bDescriptorSubtype
0x01 bJackType
0x01 bJackID
0x00 iJack
MS MIDI IN Jack Descriptor:
0x06 bLength
0x24 bDescriptorType
0x02 bDescriptorSubtype
0x02 bJackType
0x02 bJackID
0x00 iJack
MS MIDI OUT Jack Descriptor:
0x09 bLength
0x24 bDescriptorType
0x03 bDescriptorSubtype
0x01 bJackType
0x03 bJackID
0x01 bNrInputPins
0x02 baSourceID(1)
0x01 baSourcePin(1)
0x00 iJack
MS MIDI OUT Jack Descriptor:
0x09 bLength
0x24 bDescriptorType
0x03 bDescriptorSubtype
0x02 bJackType
0x04 bJackID
0x01 bNrInputPins
0x01 baSourceID(1)
0x01 baSourcePin(1)
0x00 iJack
Endpoint Descriptor (Audio/MIDI 1.0):
0x09 bLength
0x05 bDescriptorType
0x01 bEndpointAddress (OUT endpoint 1)
0x02 bmAttributes (Transfer: Bulk / Synch: None / Usage: Data)
0x0040 wMaxPacketSize (64 bytes)
0x00 bInterval
0x00 bRefresh
0x00 bSynchAddress
*** ERROR: Invalid wMaxPacketSize. Must be 512 bytes in high speed mode.
MS Bulk Data Endpoint Descriptor:
0x05 bLength
0x25 bDescriptorType
0x01 bDescriptorSubtype
0x01 bNumEmbMIDIJack
0x01 baAssocJackID(1)
Endpoint Descriptor (Audio/MIDI 1.0):
0x09 bLength
0x05 bDescriptorType
0x81 bEndpointAddress (IN endpoint 1)
0x02 bmAttributes (Transfer: Bulk / Synch: None / Usage: Data)
0x0040 wMaxPacketSize (64 bytes)
0x00 bInterval
0x00 bRefresh
0x00 bSynchAddress
*** ERROR: Invalid wMaxPacketSize. Must be 512 bytes in high speed mode.
MS Bulk Data Endpoint Descriptor:
0x05 bLength
0x25 bDescriptorType
0x01 bDescriptorSubtype
0x01 bNumEmbMIDIJack
0x03 baAssocJackID(1)
Microsoft OS Descriptor is not available. Error code: 0x0000001F
String Descriptor Table
Index LANGID String
0x00 0x0000 0x0409
0x01 0x0409 “Polyend”
0x02 0x0409 “Mess”
Connection path for device:
USB xHCI Compliant Host Controller
Root Hub
Mess (VID=0x16D0 PID=0x111C) Port: 1
Running on: Windows 10 or greater (Build Version 26200)
Brought to you by TDD v2.19.0, Dec 5 2023, 12:08:38