Re: [pyusb-users] Fwd:

[Jonas M. <jo...@pr...>]

On Thu, Apr 22, 2021 at 01:38:58PM +0300, Арам Абовян wrote:
> ---------- Forwarded message ---------
> От: Aram Abovyan <abo...@ya...>
> Date: чт, 22 апр. 2021 г., 13:37
> Subject:
> To: abo...@gm... <abo...@gm...>
> 
> 
> I am very new to PyUSB and any help from PyUSB experts will be highly
> appreciated. .
> 
> When I applied the following few lines in IDLE Python GUI,
> ---------------------------------------------------------------
> 
> import os
> os.environ['PYUSB_DEBUG'] = 'debug'import usb.core
> usb.core.find()
> 
> ----------------------------------------------------------------
> 
> I have got the following response :
> 
> =======================  =======================
> 
> 
> 
> 2021-04-22 10:29:59,680 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<WinDLL 'C:\Windows\system32\libusb-1.0.dll', handle 6b600000 at 0x3dc53fd250>)
> 2021-04-22 10:29:59,688 INFO:usb.core:find(): using backend "usb.backend.libusb1"
> 2021-04-22 10:29:59,688 DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
> 2021-04-22 10:30:02,122 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x0000003DC73C5DC0>)
> 2021-04-22 10:30:02,123 DEBUG:usb.backend.libusb1:_LibUSB._finalize_object()
> 
> 
> 
> I have googled that, but did not understand much from the serach-
> results.

There is absolutely nothing wrong here.

You enabled PYUSB_DEBUG, and called usb.core.find().

The default is for find() to find (at most) a single USB device, which,
according to the debug output, it did (even though it appears that you
omitted the IDLE output that looks something like `<DEVICE ID ffff:ffff
on Bus 001 Address 001>`).

Maybe you wanted to store the device returned by find() somewhere?

Also, generally speaking, you either want to find one of a specific device
    usb.core.find(idVendor=<...>, idProduct=<...>)
or all devices (optionally also filtering by idVendor and/or idProduct)
    usb.core.find(find_all=True)
    usb.core.find(find_all=True, idVendor=<...>)
    usb.core.find(find_all=True, idVendor=<...>, idProduct=<...>)
but rarely do you need a single randomly picked device.

My suggestion is for you to (continue to) follow the PyUSB tutorial:
    https://github.com/pyusb/pyusb/blob/master/docs/tutorial.rst

Thanks,
Jonas

> 
> 
> What am I missing out?


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