[Libusb-win32-devel] Bulk USB transfers works with USB3.0 ports and not with USB2.0

[Aymen J. <jeb...@gm...>]

Hi All,

I am developping an USB to I2C bridge using the SAM3U4E microcontroller.
The USB communication works fine untill I used the USB isolator cable :
https://iftools.com/isolator/isousbcable/index.en.php

With this configuration I still have control transfers to work correctly
but not the bulk transfers.
But I noticed that the bulk transfers are working fine when I connect the
USB cable to an USB3.0 port. but it fails with USB2.0.

I am using the libusb-win32 APIs.

The failure is always at usb_claim_interface:
[12224] libusb0-dll:err [claim_interface] could not claim interface 0,
invalid configuration 0
Could anyone please suggest a solution ?

I upgraded to lubsubK drivers 3.0.7.0 but no success.

Best regards,
Aymen Jebali