Bitcraze Forums

Hi everybody

I got some issue when i try to run the crazyflie Python client from source on windows 8.

When i run the .exe downloaded from https://bitbucket.org/bitcraze/crazyfli ... 4.01.0.exe, everything works great. The problem is when i run the client from source in PyCharm, i got a usb problem : when i click on "scan", the following exception is thrown : WARNING:cflib.crtp.usbdriver:Exception while scanning for Crazyflie USB: No backend available
That's very weird... it seems that the Crazyradio is not recognized (my gamepad controller works great).

Any idea ?

Thanks a lot, have a nice day

Hi Krokoko,

I just tested on windows here and it works for me.

I can remember this kind of problems when using 64bits version of python, the exe installation is made from a 32bit python. If you are running 64bit python you can try 32bit instead.

BR,
Arnaud

I had Crazyradio problems for a while. A "fix" that worked (after much time in the debugger) is this:
In Crazyradio.py:
In the try block at line 59:
I changed import usb.backend.libusb0 as libusb0 to import usb.backend.libusb10 as libusb0

Hi guys,

Thank you for answer ! I will try it tomorrow, I'll keep you informed of my progress.

Have a nice day

Hi everybody,

I tried your fixes this afternoon, but it doesn't works... I can't understand why. It seems to be a problem with libusb or pyusb, because my crazyradio works with the binaries. I will continue my investigations.

Thank you for your answers

Krokoko I'm having the exact same problem under the exact same circumstances... Pretty crazy that we're both attempting to do the same thing one day apart! I will let you know if I find a fix, and I hope you will do the same!

Hi all that have this problem,

Can you tell me your configuration so that I can attempt to reproduce the problem.
- Windows version, windows 32 or 64bit
- python version and if it is 32 or 64bits
- PyUSB version
- Which driver have you installed for the Crazyradio

I just created a wiki page that walk throw the windows installation, while writing it I tested the procedure in a win7 64bit virtual machine and it works: http://wiki.bitcraze.se/doc:crazyflie:dev:env:python

Tell me if it helps and do not hesitate to edit the wiki page if you want to (just contact us to get a wiki account).

Hi guys,

jasongd05 : no problem, if i find a fix i will post it here
arnaud :

- Windows version, windows 32 or 64bit : windows 8 64 bits in VmWare fusion (Mac OS (Yosemite) as host)
- python version and if it is 32 or 64bits : python 2.7.3 32bits
- PyUSB version : pyusb 1.0.0a2
- Which driver have you installed for the Crazyradio : i've used zadig as mentioned in the wiki, with libusb 1.2.6.0 (32 bits)

For the moment i'm working with the bitcraze VM, but i have to use a microsoft kinect in my project so i must run from source on Windows :/

Now I am having the same problem on a Mac... haha the exact same error and everything!

... -admin$ python --version
Python 2.7.7 :: Anaconda 2.0.1 (x86_64)

from the PKG-INFO file in pyusb
Name: pyusb
Version: 1.0.0b2

And the USB driver appears to have installed no problem on the mac here.