Questions tagged [libusb]
libusb is a library that gives user level applications uniform access to USB devices across many different operating systems.
libusb
879
questions
47
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Simple way to query connected USB devices info in Python?
How can we query connected USB devices info in Python?
I want to get UID Device Name (ex: SonyEricsson W660), path to device (ex: /dev/ttyACM0)
And also what would be the best Parameter out of above ...
- 2,396
47
votes
0
answers
1k
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libusb: error [op_open] getcap failed in C++ on Linux [closed]
I am running into trouble calling libusb_open in C++ on Linux (running on Raspberry Pi but virtualized to x86 using Exagear).
I can find a device using libusb_get_device_list but it appears ...
- 736
46
votes
12
answers
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More than one file was found with OS independent path 'lib/x86/libusb.so'
I am using libusb in my android application. When I am trying to build libusb native library then I get below error message, *.so files generated.
Error:Execution failed for task ':app:...
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45
votes
13
answers
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Pyusb on windows - no backend available
I'm trying to have my Python application interface with an NFC device via USB.
The best option seems to be PyUSB, but I can't get it to connect to the libusb backend.
I keep getting
ValueError: No ...
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43
votes
4
answers
93k
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How to set up libusb on Mac OS X?
I'd like to try to make a user-space device driver using libusb on Mac, but I'm confused where to start. In the SDK installer (which I got from http://www.ellert.se/twain-sane) it said something about ...
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40
votes
7
answers
236k
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How to install libusb in Ubuntu
I have a C program that have #include part in the header.
I have download libusb-1.0.0 to my computer. If I simply copy libusb-1.0.0 folder to the folder where my C program is, it will not work. ...
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24
votes
3
answers
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How to most properly use libusb to talk to connected USB devices?
How do I most properly use libusb to talk to connected USB devices?
Specifically, how do I transfer data to the USB devices, receive information from the devices, find out the name of the connected ...
- 711
21
votes
1
answer
2k
views
How to set alternate setting for the USB device using libusb
I am trying to set alternate setting for the USB HUB device which has 5 interfaces.
Following are the configurations for each interface.
1. Ifs= 5 Cfg#= 1 Atr=c0 MxPwr= 2mA A: FirstIf#= 0 IfCount= ...
- 12.8k
20
votes
3
answers
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How to use libusb and libusb_get_device_descriptor()?
I'm learning to use libusb v1.0.0 for the first time on Ubuntu 12.10. Here is some small test code I'm using to try and understand how to use this API:
#include <libusb-1.0/libusb.h>
...
...
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17
votes
3
answers
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Determine USB device file Path
How can i get USB device file path correctly in Linux.
I used command: find / -iname "usb" and got the result as below:
/dev/bus/usb
/sys/bus/usb
/sys/bus/usb/drivers/usb
/sys/kernel/debug/usb
Under ...
- 1,028
17
votes
2
answers
16k
views
Android ADK with PC as USB Host with libusb, bulk transfer error
I'm trying to make my PC the USB Host for Android 2.3.4 devices in order to be able to develop APIs without needing actual "accessories". To do this, I need to establish the PC as the USB Host and ...
- 455
15
votes
4
answers
21k
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How to give /dev/bus/usb permissions for libusb android applications?
i am developing an Application that uses libusb via jni.
this application is currently targeted only to rooted, usb-host
Android 3+ machines.
the scenario is as follows:
<java Activity>
...
- 151
15
votes
2
answers
3k
views
LibUsb claim interface access denied Java
I want to be able to read data from an USB pedometer. I'm trying this in Java and I'm using the LibUsb and Usb4Java libraries. I can't seem to claim the usb pipe or anything like that.
The code I'm ...
- 181
13
votes
2
answers
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know a usb device's endpoint
Is there a bash command, a program or a libusb function (although I did not find one) which indicates me what are the OUT or IN endpoints of a usb device ?
For example, bNumEndpoints of ...
- 893
12
votes
4
answers
39k
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Libusb undefined reference to
I'm trying to set up libusb API on my OS. I downloaded libusb api on libusb.org. I followed the standard installation procedure:
cd into directory
./configure
make
make check //without errors
make ...
- 799
12
votes
3
answers
15k
views
Why does PyUSB / libusb require root (sudo) permissions on Linux?
I have been toying around with PyUSB lately, and found that it works beautifully on Linux (Ubuntu has libusb 0.1 and 1.0, as well as OpenUSB)... but only if I run the program with root privileges (...
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12
votes
3
answers
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libusb interface already claimed
I'm writing a device driver for a usb device using libusb. When I attempt to claim the device I get the error code LIBUSB_ERROR_BUSY (-6). According to the documentation that means that the device ...
- 175
12
votes
3
answers
26k
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Error message 'Interface not claimed' from libusb
I'm trying to use libusb, but I am get the following error message:
usbfs: process 24665 (myprogram) did not claim interface 0 before use
I don't really understand why, because as far as I can ...
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11
votes
5
answers
39k
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libusb_open returns 'LIBUSB_ERROR_NOT_SUPPORTED' on Windows 7
I have been developing USB drivers using LibUSB on Linux, but now I want to have one of my drivers compiled for Windows (this is the first time I am doing it).
My environment
I am working on Windows 7 ...
- 988
11
votes
3
answers
26k
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linux / libusb get usb device path
I use libusb to enumerate over a few usb-devices. Now i like to get the "device-path". I think it's not called usb device-path, because i was not successful with google.
If i connect a usb-device ...
- 2,425
11
votes
2
answers
14k
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Using libusb on Android without rooting
I am trying to communicate with USB device from Android-based smartphone via OTG. I was able to communicate with my device using Android USB Host API. The problem of USB Host API solution is ...
- 111
11
votes
1
answer
2k
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Reading from Android USB Accessory throws ENODEV IOException
So I've implemented the Android USB Accessory API such that I can plug in my phone to my laptop running linux and it puts the phone into USB Accessory mode. Then I can access the accessory, open it, ...
- 297
11
votes
3
answers
32k
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How to send data to USB device in node.js using libusb
I have try to get data from device (USB thermometer), following this documentation, but I have not any result.
For getting themperature data from device, I should send the data like that 'd\n'.
This ...
- 323
11
votes
1
answer
713
views
How to recover from a stall in chrome.usb?
I'm sending an out bulk transfer, and I stall it in the device (I write the code on both end of the cable) to abort the action. I'm sending a home-made control transfert SET_FEATURE ENDPOINT_HALT to ...
- 5,024
10
votes
8
answers
5k
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Input from 20+ microphones
I've been asked (if it's possible) to write a program monitoring the input of at least 20 microphones, on a single computer.
Currently I'm prototyping in python (2.6), on a Ubuntu system using Alsa. ...
- 103
10
votes
3
answers
3k
views
How can I know if a USB device is already in use?
I am writing a C++ Linux userspace driver for a USB device using the C library libusb. I have two copies of the same device (same vendor ID and product ID) and would like to know how to handle this ...
- 5,189
10
votes
1
answer
5k
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Software based Android accessory on Windows
I would like to turn my computer into an Android accessory using my application. So instead of a specialized hardware this will be just PC that will switch the phone into accessory mode, thus ...
- 2,034
9
votes
1
answer
8k
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hidapi vs libusb for Linux
Writing some C code for USB mouse.
More specifically writing configuration and information to mouse like poll, sensitivity, button actions, colors (light), tactile alters, OLED etc.
Started out with ...
- 1,082
9
votes
1
answer
15k
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Accessing Linux /dev/USB as standard files to communicate with USB device
I'm researching ways to communicate with a USB device in Linux and would prefer to not write a Linux Kernel driver. I understand that libusb exists and is a user-land library that would work, but our ...
- 5,987
9
votes
3
answers
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PyUSB 1.0: NotImplementedError: Operation not supported or unimplemented on this platform
I just began to use pyusb, and basically I'm playing with the sample code here.
I'm using Windows7 64 bit, and downloaded the zip version from https://walac.github.io/pyusb/. Backend is libusb-1.0....
- 1,647
8
votes
2
answers
21k
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Compiling against libusb-dev on Ubuntu
I am trying to compile the example libusb.c provided by libusb package (if you dl the source code.)
It doesn't work to say the least.
#include <stdio.h>
#include <sys/types.h>
#include &...
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votes
5
answers
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PyUSB: SCPI communication with OWON Oscilloscope
This is an updated and shortened question.
Communicating with a USB-device should be easy via PyUSB. So, I'm trying to read from a USB-device (oscilloscope) using PyUSB under Win10. Apparently, the ...
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8
votes
2
answers
17k
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pyusb: cannot set configuration
I am trying to make a script (on linux) that can turn a light in my mouse on or off.
This is the code I have so far:
import usb.core
import usb.util
import sys
interface = 0
dev = usb.core.find(...
- 1,005
8
votes
1
answer
2k
views
`libusb_attach_kernel_driver` not working
I have a problem shutting down cleanly my Linux application that uses libusb (the kernel does not reclaim the interface):
int rc;
rc = libusb_reset_device(handle_);
if (rc < 0) {
cerr <<...
- 432
7
votes
1
answer
9k
views
USB Programming with Objective-C
Can anyone tell me how to program USB devices with Objective-C as an iPhone application?
I want to access USB device contents through iPhone
- 1,815
7
votes
3
answers
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Pyusb on Windows 7 cannot find any devices
So I installed Pyusb 1.0.0-alpha-1
Under Windows, I cannot get any handles to usb devices.
>>> import usb.core
>>> print usb.core.find()
None
I do have 1 usb device plugged in(...
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7
votes
2
answers
39k
views
libusb bulk transfer
I am trying to implement user space usb driver using libusb1.0.9. I have lpc2148 blueboard(ARM7) with me..This board is loaded with opensource USB stack/firmware by Mr. Bertrik Sikken. Now my user ...
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7
votes
1
answer
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libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=2 - What am I doing wrong with LibUSB?
Ok, I'm probably doing something dumb, but I can't get libusb to let me transfer data to my device for the life of me.
Code:
#include <iostream>
#include <iomanip>
#include <unistd.h&...
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votes
2
answers
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LibUsbDotNet No devices found when calling UsbDevice.AllDevices
I am executing the example code of LibUsbDotNet which will return me the information of all connected usb devices. You can find this code below.
using System;
using LibUsbDotNet;
using LibUsbDotNet....
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votes
1
answer
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What are consequences of not calling libusb_exit()
I am writing a userspace program which interacts with the USB video playback controller. I am programming in C++ and the program is intended to run on Linux. While studying the libusb manual I came ...
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1
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libusb_claim_interface fails on Mac OS X Mountain Lion
I've searched for hours with no avail. I've seen it everywhere that libusb_detach_kernel_driver isn't supported on Mac OS X, but I haven't been able to find a patch or alternative for it.
...
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7
votes
1
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USB permission obtained via android.hardware.usb does not apply to NDK
I was able to obtain a permission to communicate with a device via Android's USB Host API.
private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
protected void ...
- 1,177
7
votes
0
answers
4k
views
Turn off specific USB port in windows with python
This is my first post, and I kind of have seen that the more specific the better, so I'll try to be super clear, and thanks in advance!
What I want:
I need to scan images from 2 or more scanners ...
6
votes
1
answer
4k
views
Python on M1 MBP trying to connect to USB devices - NoBackendError: No backend available
I am trying to connect with Python to my USB devices.
The final result should be a connection to my Blood Pressure Monitor but I am failing already to connect to ANY device.
My simple code - which I ...
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6
votes
3
answers
12k
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Unable to claim USB interface with C + libusb on Mac OS X
I've got a compound USB + CDC device I built using a PIC32 microcontroller, and I'm trying to connect to the device and send some data to the CDC data interface endpoint from my Mac.
I know the ...
6
votes
2
answers
1k
views
How do I mutate the item in Iterator::find's closure?
I would like to use Iterator::find on libusb::Devices object, which has a signature like so:
fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
where Self: Sized, P: ...
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6
votes
2
answers
15k
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Accessing a USB device with libusb-1.0 as a non-root user
I am trying to interface with a USB device as a non-root user on RHEL5. The device is a GPIO interface (its documentation can be found at http://www.xdimax.com/sub20/sub20.html) which uses libusb-1.0....
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3
answers
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Android L | libusb_init returns LIBUSB_ERROR_OTHER (-99)
I trying to use libusb on not rooted Nexus 5 as advised in this approach (by transferring usb file descriptor from java to native side).
My application ask permission via UsbManager.requestPermission ...
- 5,603
6
votes
2
answers
18k
views
libusb interrupt transfer
I need to reverse engineer a driver for custom made HID USB device (some buttons and leds on an control panel). The driver is only available on Windows and we need a *nix implementation.
The device ...
- 1,111
6
votes
2
answers
11k
views
Control the power of a usb port in Python
I was wondering if it could be possible to control the power of usb ports in Python, using vendor ids and product ids. It should be controlling powers instead of just enabling and disabling the ports. ...
- 155