Can't Find Device with PyUSB

Question

I found my device's VID and PID in the properties for the device on windows, which are 256 for the VID and 006 for the PID. I can't seem to get pyusb to find it. From what I've seen, most people put the VID and PID in hex, which I tried and it still doesn't work. Here's my code:

import usb.core
import usb.util

VID = 256
PID = 6

dev = usb.core.find(idVendor=VID, idProduct=PID)

dev is always None. Any clue what I did wrong?

EDIT:

I just tested with another device with a VID of 0x046D and a PID of 0xC21D and it still returns None.

EDIT 2:

I have libusb installed and I've tried running the script in both Python 3.4 and Python 2.7. It always returns None.

What does `usb.core.find(find_all=True)` return? Or try other arguments for `find()` as well! — Klaus D., Dec 26 '17 at 03:14
@KlausD. I iterated through it and it seems to be empty. I did `for i in dev:` and it never looped. — CMLSC, Dec 26 '17 at 03:21
`VID=0x01 and PID =0x00` ? Remove all drivers for your USB device. You are an Administrator ? — dsgdfg, Dec 26 '17 at 05:38
@dsgdfg I am an Administrator and I still get `None` from `VID=0x01, PID=0x00`. — CMLSC, Dec 26 '17 at 11:34
@dsgdfg So apparently I needed to use libusb and install the driver for the device. I thought I needed the `libusb1` library. xD — CMLSC, Dec 26 '17 at 11:56
This was my issues as well. usb.core.find(find_all=True) returned nothing on my Windows 10 machine until I used the inf-wizard to generate and install the driver. — Jason Rollins, Aug 20 '21 at 15:30

score 1 · Answer 1 · answered Dec 26 '17 at 11:59

1

I ended up needing inf-wizard.exe from libusb to install drivers to my USB devices so it could work with PyUSB. I did not need to install libusb1 for Python.

answered Dec 26 '17 at 11:59

CMLSC

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Can't Find Device with PyUSB

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