Re: Bulk USB transfers works with USB3.0 ports and not with USB2.0

On Mon, Sep 29, 2014 at 10:29 PM, Aymen JEBALI <[email protected]> wrote:
> 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.

Is your device recognized by Windows and is configured properly
under Windows? Configuration 0 means that the device is not
configured. You should try to call usb_set_configuration(1) before
calling usb_claim_interface(0) to see if that helps. If not, most likely
it is a problem with the USB isolator or your device.

You shou

-- 
Xiaofan

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