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Re: [pyusb-users] dev.set_configuration() not executing
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From: Jeffrey N. <jsn...@su...> - 2019-01-21 22:21:53
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Looks to me like a device permission issue. I suspect that chmod on /dev/usb won't do what you want. Some distros have a usb group that you can add your user to. I usually end up setting up a udev rule, though. My best guess on the root/sudo thing is your user's site-packages aren't being read while running as root, so it doesn't think you have pyusb installed at all. Could run pip as root to install pyusb. Best, Jeff On 1/21/2019 4:28 PM, charles wilson wrote: > Hi Jacques, the type of device makes no difference I have tried with > range of devices, keyboard, usb HDD, robotic interface .... all with > the same results > > Cheers > Charles > > On Mon, 21 Jan 2019 at 19:34, Jacques-D. Piguet > <jac...@bl... <mailto:jac...@bl...>> wrote: > > Hi Charles, > > What kind of device are you trying to communicate with? > > Regards, Jacques-D. > > > On 21.01.19 05:23, charles wilson wrote: >> Hi Guys, >> Thanks for your time and feedback; it's taken awhile to get back >> to this. >> On permissions, I had checked/changed permissions previously but >> re-checked and found a missed one in >> /python3.5/site-packages/usb/backend- happened to be >> libusb1.pywhich was flagged - all fixed now >> I had also not checked the /dev/*USB* but did and gave necessary >> permissions >> >> pi@raspi3:~/.local/lib/python3.5/site-packages/usb >> <mailto:pi@raspi3:~/.local/lib/python3.5/site-packages/usb> $ ls -l >> total 132 >> drwxrwxrwx 3 pi pi 4096 Jan 20 13:31 backend >> -rwxrwxrwx 1 pi pi 8739 Jan 20 13:31 control.py >> -rwxrwxrwx 1 pi pi 46704 Jan 20 13:31 core.py >> -rwxrwxrwx 1 pi pi 3215 Jan 20 13:31 _debug.py >> -rwxrwxrwx 1 pi pi 3550 Jan 20 13:31 __init__.py >> -rwxrwxrwx 1 pi pi 3522 Jan 20 13:31 _interop.py >> -rwxrwxrwx 1 pi pi 12588 Jan 20 13:31 legacy.py >> -rwxrwxrwx 1 pi pi 6788 Jan 20 13:31 libloader.py >> -rwxrwxrwx 1 pi pi 3259 Jan 20 13:31 _lookup.py >> -rwxrwxrwx 1 pi pi 5287 Jan 20 13:31 _objfinalizer.py >> drwxrwxrwx 2 pi pi 4096 Jan 20 13:31 __pycache__ >> -rwxrwxrwx 1 pi pi 12291 Jan 20 13:31 util.py >> >> pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend >> <mailto:pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend> >> $ ls -l >> total 108 >> -rwxrwxrwx 1 pi pi 16048 Jan 20 13:31 __init__.py >> -rwxrwxrwx 1 pi pi 23783 Jan 20 13:31 libusb0.py >> -rwxrwxrwx 1 pi pi 35299 Jan 20 13:31 libusb1.py >> -rwxrwxrwx 1 pi pi 28019 Jan 20 13:31 openusb.py >> drwxrwxrwx 2 pi pi 4096 Jan 20 13:31 __pycache__ >> pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend >> <mailto:pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend> >> $ cd __pycache__ >> pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend/__pycache__ >> <mailto:pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend/__pycache__> >> $ ls -l >> total 76 >> -rwxrwxrwx 1 pi pi 16140 Jan 20 13:31 __init__.cpython-35.pyc >> -rwxrwxrwx 1 pi pi 15006 Jan 20 13:31 libusb0.cpython-35.pyc >> -rwxrwxrwx 1 pi pi 23713 Jan 20 13:31 libusb1.cpython-35.pyc >> -rwxrwxrwx 1 pi pi 18216 Jan 20 13:31 openusb.cpython-35.pyc >> pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend/__pycache__ >> <mailto:pi@raspi3:~/.local/lib/python3.5/site-packages/usb/backend/__pycache__> >> $ >> >> still get the same error diagnostic which still ends >> usb.core.USBError: [Errno 13] Access denied (insufficient >> permissions)" >> Traceback (most recent call last): >> File "/home/pi/usb1.py", line 12, in <module> >> dev.set_configuration() >> File "/home/pi/.local/lib/python3.5/site-packages/usb/core.py", >> line 869, in set_configuration >> self._ctx.managed_set_configuration(self, configuration) >> File "/home/pi/.local/lib/python3.5/site-packages/usb/core.py", >> line 102, in wrapper >> return f(self, *args, **kwargs) >> File "/home/pi/.local/lib/python3.5/site-packages/usb/core.py", >> line 147, in managed_set_configuration >> self.managed_open() >> File "/home/pi/.local/lib/python3.5/site-packages/usb/core.py", >> line 102, in wrapper >> return f(self, *args, **kwargs) >> File "/home/pi/.local/lib/python3.5/site-packages/usb/core.py", >> line 120, in managed_open >> self.handle = self.backend.open_device(self.dev) >> File >> "/home/pi/.local/lib/python3.5/site-packages/usb/backend/libusb1.py", >> line 786, in open_device >> return _DeviceHandle(dev) >> File >> "/home/pi/.local/lib/python3.5/site-packages/usb/backend/libusb1.py", >> line 643, in __init__ >> _check(_lib.libusb_open(self.devid, byref(self.handle))) >> File >> "/home/pi/.local/lib/python3.5/site-packages/usb/backend/libusb1.py", >> line 595, in _check >> raise USBError(_strerror(ret), ret, _libusb_errno[ret]) >> usb.core.USBError: [Errno 13] Access denied (insufficient >> permissions) >> so basically no change. >> >> Now the interesting bit. I tried running as root >> root@raspi3:/home/pi/PyProj# python3.5 pyusb_1.py >> Traceback (most recent call last): >> File "pyusb_1.py", line 2, in <module> >> import usb.core >> ImportError: No module named 'usb' >> >> same result if I simply sudo python3.5 pyusb_1.py >> >> when I run python3.5 from the terminal and get the python >>> >> prompt there is no trouble with 'import' and checking with >> 'help(usb)' shows the module is there and accessible. >> >> Interesting though is that I have the same problem on all linux, >> so whatever I did wrong I did it each time. I have tried >> installing pyusb with PIP and sudo apt-get but it makes no >> difference. >> >> The further I go with this the darker the tunnel gets. >> >> Cheers >> Charles >> >> On Sat, 19 Jan 2019 at 09:23, Sergio A. Quiroga >> <ser...@gm... <mailto:ser...@gm...>> wrote: >> >> i saw this message: >> >> usb.core.USBError: [Errno 13] Access denied (insufficient >> permissions) >> >> >> when i was using a wrong driver in Windows 10. I could also >> see the whole usb device descriptor, just could not interact >> with it. >> >> my suggestion is to try to re install or update the libusb driver >> >> On Thu, Jan 17, 2019 at 9:01 PM charles wilson >> <cmf...@gm... <mailto:cmf...@gm...>> wrote: >> >> Hi, >> I usually manage to solve my problems by hitting my head >> against them until I get a breakthrough. This time nothing. >> I am new to trying PYUSB. I have the same problem with 2 >> installations. >> 1) Ubuntu Mate 16.04 on Kernel Linux 4.15.0-43-generic >> x86_64running on AMD Ryzen 5 2600X >> 2) Raspbian (Jessie) on Raspberry Pi 3B+ >> >> Also I confirm that libusb-1.0-0 >> <https://pkgs.org/download/libusb-1.0-0> is there on both. >> >> After installation I started the tutorial (why not?) but >> did not get far: >> >> import usb.core >> import usb.util >> >> dev = usb.core.find(idVendor=0x1d6b, idProduct=0x0003) >> print(dev) >> /OK so far and I get:/ >> / >> ================== RESTART: >> /home/wilson/temPY/USBtest01.py ================== >> DEVICE ID 1d6b:0003 on Bus 004 Address 001 ================= >> bLength : 0x12 (18 bytes) >> bDescriptorType : 0x1 Device >> bcdUSB : 0x300 USB 3.0 >> bDeviceClass : 0x9 Hub >> bDeviceSubClass : 0x0 >> bDeviceProtocol : 0x3 >> bMaxPacketSize0 : 0x9 (9 bytes) >> idVendor : 0x1d6b >> idProduct : 0x0003 >> bcdDevice : 0x415 Device 4.15 >> iManufacturer : 0x3 Error Accessing String >> iProduct : 0x2 Error Accessing String >> iSerialNumber : 0x1 Error Accessing String >> bNumConfigurations : 0x1 >> CONFIGURATION 1: 0 mA ==================================== >> bLength : 0x9 (9 bytes) >> bDescriptorType : 0x2 Configuration >> wTotalLength : 0x1f (31 bytes) >> bNumInterfaces : 0x1 >> bConfigurationValue : 0x1 >> iConfiguration : 0x0 >> bmAttributes : 0xe0 Self Powered, Remote Wakeup >> bMaxPower : 0x0 (0 mA) >> INTERFACE 0: Hub ======================================= >> bLength : 0x9 (9 bytes) >> bDescriptorType : 0x4 Interface >> bInterfaceNumber : 0x0 >> bAlternateSetting : 0x0 >> bNumEndpoints : 0x1 >> bInterfaceClass : 0x9 Hub >> bInterfaceSubClass : 0x0 >> bInterfaceProtocol : 0x0 >> iInterface : 0x0 >> ENDPOINT 0x81: Interrupt IN ========================== >> bLength : 0x7 (7 bytes) >> bDescriptorType : 0x5 Endpoint >> bEndpointAddress : 0x81 IN >> bmAttributes : 0x3 Interrupt >> wMaxPacketSize : 0x4 (4 bytes) >> bInterval : 0xc >> / >> / >> / >> which tells me that pyusb is installed and is finding >> USB.core and seems to be working. >> When I take the next step in the tutorial: >> dev.set_configuration() >> >> it all turns to custard and I get: >> >> raceback (most recent call last): >> File "/home/wilson/temPY/USBtest01.py", line 11, in >> <module> >> dev.set_configuration() >> File "/usr/lib/python3/dist-packages/usb/core.py", line >> 799, in set_configuration >> self._ctx.managed_set_configuration(self, configuration) >> File "/usr/lib/python3/dist-packages/usb/core.py", line >> 127, in managed_set_configuration >> self.managed_open() >> File "/usr/lib/python3/dist-packages/usb/core.py", line >> 105, in managed_open >> self.handle = self.backend.open_device(self.dev) >> File >> "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", >> line 722, in open_device >> return _DeviceHandle(dev) >> File >> "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", >> line 600, in __init__ >> _check(_lib.libusb_open(self.devid, byref(self.handle))) >> File >> "/usr/lib/python3/dist-packages/usb/backend/libusb1.py", >> line 552, in _check >> raise USBError(_strerror(ret), ret, _libusb_errno[ret]) >> usb.core.USBError: [Errno 13] Access denied (insufficient >> permissions) >> >> This on the AMD system, the diagnostic on the Raspi is >> similar but not identical. >> >> I have worked through the other similar postings on the >> mailing list - while similar their problems were at a >> more complex level --- I am at step 1 with the tutorial ... >> I have also worked through the occurrences of >> set_configuration() in the ...usb/core.py module and >> could see no reason for dev.set_configuration() to bomb-out. >> >> I have racked my brains and consulted my local gurus with >> no joy .... so any help would be appreciated - I have a >> feeling it is something dumb that I have missed. >> >> Cheers >> Charles >> >> >> >> _______________________________________________ >> pyusb-users mailing list >> pyu...@li... >> <mailto:pyu...@li...> >> https://lists.sourceforge.net/lists/listinfo/pyusb-users >> >> >> >> -- >> SQ >> _______________________________________________ >> pyusb-users mailing list >> pyu...@li... >> <mailto:pyu...@li...> >> https://lists.sourceforge.net/lists/listinfo/pyusb-users >> >> >> >> >> _______________________________________________ pyusb-users >> mailing list pyu...@li... >> <mailto:pyu...@li...> >> https://lists.sourceforge.net/lists/listinfo/pyusb-users > > _______________________________________________ > pyusb-users mailing list > pyu...@li... > <mailto:pyu...@li...> > https://lists.sourceforge.net/lists/listinfo/pyusb-users > > > > > _______________________________________________ pyusb-users mailing > list pyu...@li... > https://lists.sourceforge.net/lists/listinfo/pyusb-users |
