Hi
One thing does puzzles me is that. Same Centos same versions of libusb and
python to the very last version number on VirtualBox hosted on Mac OS works
fine.
I posted on stack overflow to get border attention any how here is the link to
the question..
https://stackoverflow.com/questions/47087054/pyusb-usb-scanner-read-fails-on-centos-7?noredirect=1#comment81161517_47087054
<https://stackoverflow.com/questions/47087054/pyusb-usb-scanner-read-fails-on-centos-7?noredirect=1#comment81161517_47087054>
Centos 7 with lated kernel update
CentOS Linux release 7.4.1708
>rpm -qa | grep -i libusb
libusbx-1.0.20-1.el7.x86_64
libusbmuxd-1.0.10-5.el7.x86_64
> On Nov 4, 2017, at 2:53 AM, Tormod Volden <lists.tor...@gmail.com> wrote:
>
> On Fri, Nov 3, 2017 at 10:18 PM, Srujan Chaitanya wrote:
>>
>> Hardware is Dell Precision Tower 3000 Series.
>>
>>
>> down votefavorite
>
> Hello Srujan,
>
> If you are cross-posting a question from StackOverflow, it would only
> be polite to include a link to the original question.
>
>>
>> I'm trying to implement driver mechanism for usb barcode scanner on Centos.
>>
>> Using PyUSB,
>>
>> Here is high-level code. I am trying to achieve is to be able to read
>> QR-Codes and BarCodes when someone scans and send it to message queue
>> without user interaction.
>>
>> dev = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
>> if dev.is_kernel_driver_active(0) is True:
>> dev.detach_kernel_driver(0)
>> dev.set_configuration()
>> dev.reset()
>
> Do you need the reset() here?
Not really just attempting to try if that makes any difference.
>
>> data = dev.read(endpoint.bEndpointAddress, 120,
>> timeout=10000)
>> currentData = list(chunks(data))
>>
>> This code work fine on the same system with Ubuntu operating system. But on
>> Centos 7 , All I hear rapid beeps, and nothing read from the scanner.
>>
>> Here is everything installed on Centos, almost similar to Ubuntu that I ran
>> on the same machine.
>>
>> "libgusb.x86_64 0.2.9-1.el7 @base
>> libgusb-devel.x86_64 0.2.9-1.el7 @base
>> libusb.x86_64 1:0.1.4-3.el7 @base
>> libusb-devel.x86_64 1:0.1.4-3.el7 @base
>
> The most important difference is probably the version of libusb that
> is in use. Upstream libusb.info is now at 1.0.21. Please be more
> specific about which libusb versions you have on the two systems,
> which versions of the OS, and try a newer version if possible.
>
> Regards,
> Tormod
>
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