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When using pyusb on OpenWrt MIPS platforms such as ReSpeaker, it will not work and report a error:
File "/usr/lib/python2.7/site-packages/usb/core.py", line 1263, in find raise NoBackendError('No backend available') usb.core.NoBackendError: No backend available
ctypes.util.find_library doesn't work on OpenWrt MIPS platforms.
Please use the fixed version of pyusb.
pip install https://github.com/respeaker/pyusb/archive/master.zip