Permissions deal with your Linux configuration.
Here is a general answer for Linux.
http://unix.stackexchange.com/questions/44308/understanding-udev-rules-and-permissions-in-libusb
You can google for libusb permissions for your distribution if this doesn't
lead to a solution.
> On Aug 20, 2016, at 07:46, Jay Aurabind <jay.aurab...@gmail.com> wrote:
>
> Hi,
>
> I am a user of pyOCD, and I am having an issue related to pyusb which
> is what the former uses for talking to the USB device. The situation
> is that I need to use pyOCD through an eclipse plugin. Eclipse
> launches pyocd-gdbserver and normal user. But it will only work if
> launched as root.
>
> My question is, how can I make pysb do its job without requiring root
> permissions? Here is the error I get when launching pyocd-gdbserver as
> normal user. The last lines suggests its pyusb having issues:
>
> uncaught exception: The device has no langid
> Traceback (most recent call last):
> File "build/bdist.linux-x86_64/egg/pyOCD/tools/gdb_server.py", line
> 262, in run
> frequency=self.args.frequency)
> File "build/bdist.linux-x86_64/egg/pyOCD/board/mbed_board.py", line
> 210, in chooseBoard
> target_override, frequency)
> File "build/bdist.linux-x86_64/egg/pyOCD/board/mbed_board.py", line
> 182, in getAllConnectedBoards
> connected_daps = dap_class.get_connected_devices()
> File
> "build/bdist.linux-x86_64/egg/pyOCD/pyDAPAccess/dap_access_cmsis_dap.py",
> line 352, in get_connected_devices
> all_interfaces = _get_interfaces()
> File
> "build/bdist.linux-x86_64/egg/pyOCD/pyDAPAccess/dap_access_cmsis_dap.py",
> line 44, in _get_interfaces
> return INTERFACE[usb_backend].getAllConnectedInterface()
> File
> "build/bdist.linux-x86_64/egg/pyOCD/pyDAPAccess/interface/pyusb_backend.py",
> line 88, in getAllConnectedInterface
> product = board.product
> File "/usr/lib/python2.7/site-packages/usb/core.py", line 841, in product
> self._product = util.get_string(self, self.iProduct)
> File "/usr/lib/python2.7/site-packages/usb/util.py", line 314, in get_string
> raise ValueError("The device has no langid")
> ValueError: The device has no langid
>
>
> Please let me know if there are any workarounds to make pyusb work
> without requiring root privilege.
>
> --
>
> Thanks and Regards,
> Aurabindo J
>
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