Pyusb works incorrectly with my PC. There isn't any topic about my problem on this forum. Details below. I'm trying to run a simple script that should show USB devices info:
import usb.core
import usb.util
for device in usb.core.find(find_all=True):
print(device)
And after that i get 2 errors: usb.core.USBError: [Errno 2] Entity not found and NotImplementedError: Operation not supported or unimplemented on this platform
log
DEVICE ID 8087:8008 on Bus 001 Address 003 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x200 USB 2.0
bDeviceClass : 0x9 Hub
bDeviceSubClass : 0x0
bDeviceProtocol : 0x1
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x8087
idProduct : 0x8008
bcdDevice : 0x5 Device 0.05
iManufacturer : 0x0
iProduct : 0x0
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 0 mA ====================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x19 (25 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 : 0x1 (1 bytes)
bInterval : 0xc
DEVICE ID 1c4f:0026 on Bus 003 Address 001 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x110 USB 1.1
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x8 (8 bytes)
idVendor : 0x1c4f
idProduct : 0x0026
bcdDevice : 0x110 Device 1.1
iManufacturer : 0x1 Error Accessing String
iProduct : 0x2 Error Accessing String
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 98 mA ===================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x3b (59 bytes)
bNumInterfaces : 0x2
bConfigurationValue : 0x1
iConfiguration : 0x0
bmAttributes : 0xa0 Bus Powered, Remote Wakeup
bMaxPower : 0x31 (98 mA)
INTERFACE 0: Human Interface Device ====================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x1
bInterfaceClass : 0x3 Human Interface Device
bInterfaceSubClass : 0x1
bInterfaceProtocol : 0x1
iInterface : 0x0
ENDPOINT 0x81: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x81 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x8 (8 bytes)
bInterval : 0xa
INTERFACE 1: Human Interface Device ====================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x1
bAlternateSetting : 0x0
bNumEndpoints : 0x1
bInterfaceClass : 0x3 Human Interface Device
bInterfaceSubClass : 0x0
bInterfaceProtocol : 0x0
iInterface : 0x0
ENDPOINT 0x82: Interrupt IN ==========================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x82 IN
bmAttributes : 0x3 Interrupt
wMaxPacketSize : 0x3 (3 bytes)
bInterval : 0xa
Traceback (most recent call last):
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 746, in __str__
for configuration in self:
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 1128, in __iter__
yield Configuration(self, i)
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 603, in __init__
desc = backend.get_configuration_descriptor(
File "f:\newpy\venv\lib\site-packages\usb\backend\libusb1.py", line 773, in get_configuration_descriptor
_check(self.lib.libusb_get_config_descriptor(
File "f:\newpy\venv\lib\site-packages\usb\backend\libusb1.py", line 604, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 2] Entity not found
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "usbtesta.py", line 31, in <module>
print(device)
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 750, in __str__
configuration = self.get_active_configuration()
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 909, in get_active_configuration
return self._ctx.get_active_configuration(self)
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 113, in wrapper
return f(self, *args, **kwargs)
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 247, in get_active_configuration
self.managed_open()
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 113, in wrapper
return f(self, *args, **kwargs)
File "f:\newpy\venv\lib\site-packages\usb\core.py", line 131, in managed_open
self.handle = self.backend.open_device(self.dev)
File "f:\newpy\venv\lib\site-packages\usb\backend\libusb1.py", line 804, in open_device
return _DeviceHandle(dev)
File "f:\newpy\venv\lib\site-packages\usb\backend\libusb1.py", line 652, in __init__
_check(_lib.libusb_open(self.devid, byref(self.handle)))
File "f:\newpy\venv\lib\site-packages\usb\backend\libusb1.py", line 600, in _check
raise NotImplementedError(_strerror(ret))
NotImplementedError: Operation not supported or unimplemented on this platform
I saw a similar problem on the internet but there was a trouble about working with a specific USB device and it solved by installing Zadig and choosing the right driver. That way doesn't help me because I work not with some USB device but only with code trying to see a list of devices. The problem is not in PATH. I've tried to run my script with the next configuration: win10, python 3.8.5, and also 3.7.9, pyusb 1.1.0, libusb 1.0.23b1 / libusb-win32. If I run the script with libusb-win32 (libusb0.dll) nothing happens, python just returns an empty line and waits for the new command. If I run a script with libusb, python shows those errors above in this post. The first error disappears when I add to script line set_configuration()
for device in usb.core.find(find_all=True):
print(device)
device.set_configuration()
But how to fix the second error? In the same configuration on mac os (pyusb, libusb 1.0, python 3.7.9) this script running successfully
Strangely, but this script running successfully:
for device in usb.core.find(find_all=True):
print(device.bDeviceClass) # running only if i indicate parameter of variable "device" like here
Also strangely that pyusb finds some USB devices (as u can see in log) but in the end, appears errors. On another PC my script not running at all, errors appear right after start. So how can I see a list of connected devices? I'm glad to get any help