hid

I have a bit of a problem with generating HID descriptor. I want to use simple reports with ID1 for input and ID2 for output with 64 bytes of data. I realized that despite rtfming and googling I still do not have a clue about some fields in HID descriptor. Can somebody please give me a hint or a manual where I can find the meaning of all descriptor fields? All I could find was examples for HID-mouse/joistick/keyboard. For example - REPORT_SIZE - is it size in bytes or in bits? And why there also is REPORT_COUNT? If I have 64 bytes in the report, LOGICAL_MAXIMUM must be 255 or 255*64? Should I

Short version of what I want to accomplish : I have a foot pedal (INFINITY-IN-USB-1, if that's of any interest) that is implemented as a generic HID device, and I would like it to be behave as control and alt keys on linux. I'm looking for something on the level on X, i.e. not just individual programs. Longer version : I have this setup working in Windows XP by calling dll RegisterRawInputDevices and GetRawInputData and listening to the input in a hidden windows. All is accomplished with a fairly straightforward Autohotkey script (can post here if anyone is interested). The point is, there is

Context: I'm using Qt 5.9.3 on Windows, building for MinGW 32-bit. The Qt part is a side issue though - the problem seems to be with MinGW. The version of MinGW is 4.3.0, supplied prebuilt as part of the Qt installation. I'm building a library which talks to a USB device over HID. Everything compiles fine, but it fails at the link stage with ./..\..\object\debug\usb_hid_device.o: In function `ZN8MyApp3USB5Win3213getDevicePathB5cxx11Ell': <MYPATH>/../../source/win32/usb_hid_device.cpp:99: undefined reference to `HidD_GetAttributes(void*, _HIDD_ATTRIBUTES*)@8' ./..\..\object\debug\usb_hid_device

Something about my use of chrome.hid.send seems to be leaving the bus in a bad state. I consistently can NOT get my second usage of the API call to work. Sometimes, it will also fail on the first usage. WITH THE EXACT SAME CODE, I can come back and try a while later (maybe 10min) and the first send will work. The device I'm working with does not return a response to all messages sent to it. The test message for example, is just a dummy message that is ignored by the device. I've tested this both on a mac and a PC. My call stack depth is 2 at this point in my application (literally first one is

I am fairly new to C# as well as windows programming and I am attempting to establish communication between a USB HID device and an app written in c# on a windows xp pc. I have obtained the device path successfully and have used this to establish a valid Handle on the device: IntPtr drive = CreateFile(devicePath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, IntPtr.Zero); This proved to be a valid handle that yields a positive integer when tested. After creating the handle I call 'HidD_GetPreparsedData' and 'HidP

I have written a python script that polls evdev for a HID barcode scanner (emulates a keyboard): the script works well on Linux platforms (Ubuntu). Is there an OS X Python equivalent for evdev that would allow minor porting of the existing python script? If you have Python experience and have configured it for a HID device input, please indicate this in your response. I got a simple test working using cython-hidapi (installable as pip install hidapi - note this is different to the one linked in the comments but seems to be similar in function). I also had installed hidapi-devel from macports