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Questions tagged [usb-hid]

24 questions
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How to read barcode scanner input in background process?

I am using a barcode scanner connected to Windows PC. It is configured to work as USB HID device, and it is the most reliable mode for this scanner to work. I have developed some software to register input from it. The thing is that I want to have…
Ivan P.
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How to use ioctl + nix macros to get a variable size buffer

This is related to How to use nix's ioctl? but it is not the same question. I want to retrieve a variable size buffer. There is another ioctl that tells me that I need to read X bytes. The C header tells me the following too: #define…
Juan Leni
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Android USB - Understanding controlTransfer method

I am about to start a new project that works with a USB HID device. I know to send a command to a HID device, you use the following method: controlTransfer(int requestType, int request, int value, int index, byte[] buffer, int length, int…
Pink Jazz
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Does Linux support Runtime autosuspend feature for USB 1.1 character devices like keyboards?

I had to debug a keyboard lag issue that i faced in a logitech wireless USB keyboard and i found that it had runtime autosuspend and it was causing the keyboard to suspend after 2 seconds. The specifications of my usb 2.0 USB keyboard are Bus 003…
Aravind Prakash
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How to write things to USB HID in Linux?

I'm working with a AMOLED screen. The vendor exposes the screen's brightness control to USB HID, and only give me an example webpage that uses Chrome's navigator.hid. I read the JavaScript code and find I need to do following things: find a USB HID…
jiandingzhe
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Read data from USB RFID reader using Python

I'm trying to read data from USB RFID reader using Python script. The data was write into a RFID sticker using NFC tool on my phone. So when I scan the RFID sticker at the RFID reader, Python script should display the data that I write into the RFID…
Danialyusri
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WebHID API: How do I parse data from inputReport event?

I'm trying to grab sensor input from my digitizer ( X Tilt, Y Tilt, Tip Pressure, Tip Switch, Eraser, Pen, Puck .etc) using the WebHID API. This is what I've gotten so far: index.js: page_log = text => { let p = document.createElement("p"); …
bobajeff
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writing a linux kernel module / driver for an old keyboard / hid device

I have an old Compaq keyboard that has a set of keys on top that do not work. I have tried xev, evtest, evemu-record and libinput debug-events and every other key except those keys is recognized. However when I turn on a wireshark usb recorder I get…
cheshire
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Talk to an USB HID device from within GNU Octave

I need to control a measurement instrument from within GNU Octave. The instrument has an USB HID interface. I just need to read or change the settings of the instrument. It's not about getting measurement data from the instrument. What options are…
mbrennwa
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how do i get usb_hid on micropython

So there is a module named usb_hid on CircuitPython but its not on MicroPython. Is there a way to get usb_hid on MicroPython? It isnt in the lib folder of CircuitPython. I even tried displaying all the modules in MicroPython but usb_hid wasnt there.…
supersonic5138 supersonic5138
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Can not compile usbmouse.c : too few arguments to function 'usb_maxpacket'

I am trying to modify and compile usbmouse.c While compiling it is saying that the function usb_maxpackets requires 3 arguments but the code I copied from the torvald git is passing only 2 arguments to this function the code can be found…
aTechieSmile
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Why usbkbd driver in Linux only deal with single endpoint interface?

I am reading the source code of Linux driver about usbhid and usbkbd: if (interface->desc.bNumEndpoints != 1) return -ENODEV; endpoint = &interface->endpoint[0].desc; if (!usb_endpoint_is_int_in(endpoint)) return -ENODEV; Here you can see…
Ma Paul
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Having error: -22 while developing usb hid device

Hello we're trying to get an usb-hid device working on linux system.(Currently Rpi-2B Buildroot 64bit) But dmesg shows an error on device plugged in, while other keyboards/mouse work fine. The error -22 isn't found with googling so I am stucking…
y3k00000
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WebHID API How to get Input Report without sending Output Report

Is there a way to just ask for an Input Report using the WebHID API? The API seems to have a function to read a Feature Report directly, but I don't understand why I have to wait for an event to listen to the Input Report. From what I understood…
Patratacus
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I can't find the pip of this library usb_hid

I am doing a school project, which involves making a program that with the help of a Rasbperry pi pico and some push buttons, make a mouse. But apparently I need the usb_hid library to host my usb but I can't find it. I've been looking for the…
Jeremias Davison
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