libusb

问题 I can't see any setter RTS/DTR functions in both libusb-0.1 and libusb-1.0. Should i send smth special using usb_control_msg() ? usb device is CDC-device (not FTDI) 回答1: libusb can't do that itself - you should send 'control state' for CDC-device or FTDI-specific commands for FTDI-device. For CDC: http://cscott.net/usb_dev/data/devclass/usbcdc11.pdf `6.2.14 SetControlLineState This request generates RS-232/V.24 style control signals. ... D1 Carrier control for half duplex modems. This signal

问题 I'm new at Python, and I'm trying to write my first Python application on Visual Studio CE 2015 using IronPython. I finally managed to execute the most basic .NET-compatible code importing the clr module (which comes with the whole IronPython package) but, since my goal is writing an application that reads from a USB scale following this blog post, I'm stuck at trying to import the usb module. I downloaded and installed both pyUSB and libusb, so I thought I had to simply add the reference in

问题 I'm new at Python, and I'm trying to write my first Python application on Visual Studio CE 2015 using IronPython. I finally managed to execute the most basic .NET-compatible code importing the clr module (which comes with the whole IronPython package) but, since my goal is writing an application that reads from a USB scale following this blog post, I'm stuck at trying to import the usb module. I downloaded and installed both pyUSB and libusb, so I thought I had to simply add the reference in

问题 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. The procedure for opening the device, using its API, is: sub_device d; d = sub_find_devices(0); sub_handle h = sub_open(d); When I do this, the sub_find_devices() call works, but on the sub_open() call, I get the libusb error -3, which indicates that I do not have permissions to open the device

问题 I compiled the modified version of libusb to be used in Android devices from https://github.com/martinmarinov/rtl_tcp_andro-/blob/master/jni/libusb-andro/README Is there any example on how to use this particular function in a C program? What headers need to be included in order for this library to work. Any examples on how to use open2(, int fd) in a C program 回答1: This is no new library. Only a modified version of libusb. So, all the libusb commands are applicable here. The only difference

问题 I currently have an Android application connecting to a device via USB OTG. The communication is done using the libusb 1.0.9 and it's working pretty well for other devices with api level < 21. (The communication must be native due to performance issues) When running the app under Android L, I get the following error from libusb_init(NULL): type=1400 audit(0.0:107): avc: denied { read } for name="usb" dev="tmpfs" ino=24433 scontext=u:r:untrusted_app:s0 tcontext=u: object_r:usb_device:s0 tclass

问题 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. libusb_claim_interface returns this: libusb: 0.863377 error [darwin_claim_interface] USBInterfaceOpen: another process has device opened for exclusive access How can I detach the USB device from the kernel? 回答1: Many devices automatically have a driver attached to the USB device they are recognised as by OSX

问题 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(idVendor=0x1532, idProduct=0x0017) def main(): if dev is None: print "device not found" else: print "device found" if dev.is_kernel_driver_active(interface) is True: print "but we need to detach kernel driver" dev.detach_kernel_driver(interface) print "claiming device" usb.util.claim_interface(dev,

问题 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 <libusb/libusb.h> That causes it to fail, there is no libusb/libusb.h it's usb.h , so I change that. And it fails in new and innovative ways. I've copied the file over, exactly, and named it example.c I am using these commands and variations: gcc -o example example.c -lusb -L /usr/lib/libusb.a gcc -o example

问题 I have a Netware uniFlow device. When I plug it in it shows up in dmesg: [ 2962.369905] usb 2-1.4: new full-speed USB device number 11 using ehci-pci [ 2962.463867] usb 2-1.4: New USB device found, idVendor=171b, idProduct=2001 [ 2962.463871] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2962.463874] usb 2-1.4: Product: USB Keyboard [ 2962.463876] usb 2-1.4: Manufacturer: RFIDeas [ 2962.465361] input: RFIDeas USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2