Hi,
On Windows, for HID devices, I use a dedicated HID library : https://github.com/rene-aguirre/pywinusb
Nicolas
Le 13/11/2020 à 07:50, John Beamish a écrit :
Hi
I am trying to use a USB port to talk to a 18F46K20 pic controller. The project, which is in the early stages, will communicate simple commands to the controller, to get temperature and humidity data from a sensor attached to the controller.
I want to use Python to manipulate the results in graphic form.
I have read some articles about using PyUSB for interacting with the USB port so I thought I would do some preliminary tests to trial it before I get into the more complex parts.
I copied a small program to test it (https://github.com/pyusb/pyusb/blob/master/docs/tutorial.rst)
import usb.core
import usb.util
dev = usb.core.find(idVendor=0x04B3, idProduct=0x310C)
if dev is None:
raise ValueError('Device not found')
print (dev.idProduct,dev.idVendor)
dev.set_configuration()
The device is an USB optical mouse. Info from USB Device Viewer is at the end of this email.
Line 6 outputs 12556 1203 ( which is in decimal).
Line 7 produces the following
Exception has occurred: USBError
[Errno 40] Operation not supported or unimplemented on this platform
File "C:\Users\John Beamish\test\usbtest.py", line 7, in <module>
dev.set_configuration()
I loaded pyusb 1.1.0 with pip install pyusb and libusb1 1.8 with pip install libusb1
I am running Python 3.9 0n Windows 10 Home Version 2004.
I know I have/ or am doing something wrong but if anyone is able to advise me I would really appreciate this.
This was supposed to be the easy bit!!!
Regards
John Beamish
---===>Device Information<===---
English product name: "USB Optical Mouse"
ConnectionStatus:
Current Config Value: 0x01 -> Device Bus Speed: Low
Device Address: 0x27
Open Pipes: 1
===>Device Descriptor<===
bLength: 0x12
bDescriptorType: 0x01
bcdUSB: 0x0200
bDeviceClass: 0x00 -> This is an Interface Class Defined Device
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x08 = (8) Bytes
idVendor: 0x04B3 = IBM Corporation
idProduct: 0x310C
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