HID device and microframes on Windows

[cjung]

Hello,

I'm trying to read reports from a HID device (Windows 10) which sends the data in microframes. The hardware is developed by the company I work for and we use the native drivers from Microsoft.
As programming language I use C++ without third party libraries.

I have some experience with HID devices and have also successfully tested my code on a "normal" HID device. There everything works and I have access to the data.

I don't really get along with the microframes. I get no data and always end up in the timeout of the WaitForSingleObject().
I had a look at the USBlyser and I see that the reports arrive at the system (they are generated by the end device independently
shipped without my involvement). I can connect to the device and also read the capabilities and properties, but not the data.

Does anyone here have any experience with this and can help me with what I am missing?
Do I possibly have to write my own driver, because the standard driver does not support this?

Thanks for your help
Chris from Germany

[Jan Axelson]

I'm not sure what you mean by "sends the data in microframes" because all HID data arrives in frames / microframes.

My Usbhidio_vc6 is old but does use WaitForSingleObject and might be of some help:

http://www.janaxelson.com/hidpage.htm#MyExampleCode

I see no reason that you would need to write a driver to retrieve HID reports.

[cjung]

Back from vacation and back to the problem.
I think I need to explain the problem in more detail.We are currently developing a HID device which should send 1024 bytes in a report.
Later we want to send 4 reports in one microframe. At the moment only one to figure out the issues.

The USB descriptor tells me the following.

        +++++++++++++++++ Device Information ++++++++++++++++++
Device Description       : USB-Eingabegerät
Device ID                : USB\VID_07C0&PID_2000\7&3188F4DA&0&2
Driver KeyName           : {745a17a0-74d3-11d0-b6fe-00a0c90f57da}\0057
Driver                   : C:\WINDOWS\System32\drivers\hidusb.sys (Version: 6.2.17134  Date: 2018-04-12)
Legacy BusType           : PNPBus
Class                    : HIDClass
Service                  : HidUsb
Enumerator               : USB
Location Info            : Port_#0002.Hub_#0006
Manufacturer Info        : (Standardsystemgeräte)
Capabilities             : Removable, SurpriseRemovalOK
Address                  : 2
Problem Code             : 0
Power State              : D0 (supported: D0, D2, D3, wake from D0, wake from D2)
Child Device 1           : HID-konformes Gerät
 Device ID               : HID\VID_07C0&PID_2000\8&C2AE1C9&1&0000
 Class                   : HIDClass

        ---------------- Connection Information ---------------
Connection Index         : 0x02
Connection Status        : 0x01 (DeviceConnected)
Current Config Value     : 0x01
Device Address           : 0x06
Is Hub                   : 0x00 (no)
Number Of Open Pipes     : 0x02 (2)
Device Bus Speed         : 0x02 (High-Speed)
Pipe0ScheduleOffset      : 0x00 (0)
Pipe1ScheduleOffset      : 0x00 (0)

        ------------- Device Qualifier Descriptor -------------
bLength                  : 0x12 (18 bytes)
bDescriptorType          : 0x01 (Device Qualifier Descriptor)
bcdUSB                   : 0x200 (USB Version 2.00)
bDeviceClass             : 0x00 (defined by the interface descriptors)
bDeviceSubClass          : 0x00
bDeviceProtocol          : 0x00
bMaxPacketSize0          : 0x40 (64 bytes)
idVendor                 : 0x07C0
idProduct                : 0x2000
bcdDevice                : 0x10
iManufacturer            : 0x01
 Language 0x0409         : "Code Mercenaries"
iProduct                 : 0x02
 Language 0x0409         : "FlickerMeter"
iSerialNumber            : 0x00
bNumConfigurations       : 0x01

        -------------- Configuration Descriptor ---------------
bLength                  : 0x09 (9 bytes)
bDescriptorType          : 0x02 (Configuration Descriptor)
wTotalLength             : 0x0029 (41 bytes)
bNumInterfaces           : 0x01
bConfigurationValue      : 0x01
iConfiguration           : 0x04
 Language 0x0409         : "Standard Setup"
bmAttributes             : 0x80 (Bus Powered)
MaxPower                 : 0x32 (100 mA)

        ---------------- Interface Descriptor -----------------
bLength                  : 0x09 (9 bytes)
bDescriptorType          : 0x04 (Interface Descriptor)
bInterfaceNumber         : 0x00
bAlternateSetting        : 0x00
bNumEndpoints            : 0x02
bInterfaceClass          : 0x03 (HID - Human Interface Device)
bInterfaceSubClass       : 0x00 (None)
bInterfaceProtocol       : 0x00 (None)
iInterface               : 0x05
 Language 0x0409         : "Interface0"

        ------------------- HID Descriptor --------------------
bLength                  : 0x09 (9 bytes)
bDescriptorType          : 0x21 (HID Descriptor)
bcdHID                   : 0x0111 (HID Version 1.11)
bCountryCode             : 0x00 (00 = not localized)
bNumDescriptors          : 0x01
Descriptor 1:
bDescriptorType          : 0x22 (Class=Report  Descriptor=0x02)
wDescriptorLength        : 0x0023 (35 bytes)

        ----------------- Endpoint Descriptor -----------------
bLength                  : 0x07 (7 bytes)
bDescriptorType          : 0x05 (Endpoint Descriptor)
bEndpointAddress         : 0x81 (Direction=IN  EndpointID=1)
bmAttributes             : 0x03 (TransferType=Interrupt)
wMaxPacketSize           : 0x400 (1 transactions per microframe, max 1024 bytes)
bInterval                : 0x01 (1 ms)

        ----------------- Endpoint Descriptor -----------------
bLength                  : 0x07 (7 bytes)
bDescriptorType          : 0x05 (Endpoint Descriptor)
bEndpointAddress         : 0x01 (Direction=OUT  EndpointID=1)
bmAttributes             : 0x03 (TransferType=Interrupt)
wMaxPacketSize           : 0x40 (1 transactions per microframe, max 64 bytes)
bInterval                : 0x01 (1 ms)
--------------------------------------------------------------


Only no data arrives and I can't receive it with the example project. There the input report length of 1025 is displayed and if I want to read the data, no data arrive (Handle Error) and on the second try the tool hangs up. In my test project I already tried it with the OVERLAPPED flag and the timeout is always reached.

If we change the firmware to wMaxPacketSize : 0x40 (for endpoint 0x81 for tests), then everything works fine and the data comes through.

Now the question arises, why do the 1024 bytes arrive?
I have looked again with various USB sniffers and the data is sent over the USB (USBlyzer)

[Jan Axelson]

The endpoint is sending the 1024 byte report, but the host application doesn't see it unless you reduce wMaxPacketSize to 0x40?

[cjung]

Do you know that you look for a bug and don't make one yourself but your colleague After some research in the firmware of the device, my colleague found some hard coded values in the device firmware which did not correspond to the other values.
Now I can finally receive +1024 bytes and receive multiple reports in one frame (and could slap my colleague in the face very hard)
I was wondering if I am the only person in the WWW with these problems.

Thanks for the help anyway.

[Jan Axelson]

You are not the only person with these problems! Thanks for reporting back.