I'm trying to get value from a barcode scanner, this with pyusb on Ubuntu. After investigations, I found that the barcode scanner need to receive an activation data to be able to scan barcode. I found this data, modify my rules.d file in order to detect my device and then I ran this code to send the data through USB:
import usb.core
import usb.util
# find our device
dev = usb.core.find(idVendor=0x05f9, idProduct=0x1203)
# was it found?
if dev is None:
raise ValueError('Device not found')
# Attach and detach the usb
if dev.is_kernel_driver_active(0):
dev.detach_kernel_driver(0)
# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()
# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]
ep = usb.util.find_descriptor(
intf,
# match the first OUT endpoint
custom_match = \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_OUT)
assert ep is not None
# write the data
ep.write('\x0b')
I get the following error:
usb.core.USBError: [Errno 16] Resource busy
But normally the following code must made the device available:
# Attach and detach the usb
if dev.is_kernel_driver_active(0):
dev.detach_kernel_driver(0)
I tryed this code with another device (printer) and it's working.
Do you have any idea concerrning the problem?
I found the solution.
The problem was that usbhid driver use directly the device. So after desactivation of the drive I'm able to use it.