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
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