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@JoergAtGithub
Description
At Mixxx, users reported problems with USB 2.0 High-Speed devices, which are limited to Full-Speed mode for some reasons. Under MacOS and Windows they operate as High-Speed device.
This is not only a performance limitation, but it has functional implications for the HID communication, because USB Full-Speed is limited to a package size of 64 Bytes instead of 1024 in High-Speed mode.
The result is, that HIDAP returns a 79Byte input report correct on Windows and MacOS, but two reports on Linux (libusb backend), the first with correct report ID, the second with report ID 0x00.
How could a cross platform application using HIDAPI handle this:
- Can the speed or max. package size be determined using HIDAPI to report an error about the USB misconfiguration?
- Can the application tell the device somehow to switch to USB High-Speed mode?
- Can HIDAPI check, if a report descriptor contains report sizes of more than 64Bytes for a device in Full-Speed mode?
Windows-Output:
Debug [Controller]: Traktor Kontrol S4 MK3 HID A79A_3: t:92905 ms, 79 bytes:
02 6A 08 00 00 00 00 03 07 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Linux-Output (libusb):
Debug [Controller]: Traktor Kontrol S4 MK3 A79A_3: t:15558 ms, 64 bytes:
02 6E 08 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Debug [Controller]: Traktor Kontrol S4 MK3 A79A_3: t:15559 ms, 15 bytes:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
This is the lsusb output:
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 11 Traktor Kontrol S4 MK3 HID
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 673
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 2
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 189
bInterfaceProtocol 0
iInterface 12 Traktor Kontrol S4 MK3 BD
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 254 Application Specific Interface
bInterfaceSubClass 1 Device Firmware Update
bInterfaceProtocol 1
iInterface 10 Traktor Kontrol S4 MK3 DFU
Device Firmware Upgrade Interface Descriptor:
bLength 9
bDescriptorType 33
bmAttributes 7
Will Not Detach
Manifestation Tolerant
Upload Supported
Download Supported
wDetachTimeout 250 milliseconds
wTransferSize 64 bytes
bcdDFUVersion 1.10
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1