Re: Libusb-win32 with Xilinx Platform USB Cable II behavior

On Thu, May 1, 2014 at 11:12 PM, daved9000 <[email protected]> wrote:
> Yes, i am using the filter driver. As mentioned in my post, this is in
> addition to the xilinx cable drivers (i think this shows up as "Junga" in
> device manager?)
>
> How did you install the filter driver?
> i first installed the xilinx drivers (per board vendors instruction).
> i then downloaded the libusb installer from:
> http://sourceforge.net/projects/libusb-win32/files/libusb-win32-releases/1.2.6.0/
>
> I am using version 1.2.6.0 (the latest)
>
> the problem i am having is NOT that the driver install did not work.
> when i installed it, it worked perfectly ... until i UNPLUGGED the usb
> device, and tried to plug it back in the next day to use it. i noticed the
> driver did not 'reconnect' to the device so to say ...

Are you putting it back to the same port?

> i ended up reinstalling teh libusb driver. and i had to do this each time i
> unplugged the xilinx usb programmer.

That is not required, as you found later that reboot will sort it out.

> i later found out, that if i rebooted the PC with the programmer attached
> /plugged in, it would work again?

If that works, then you should stick to this work-around.

> i have never used this libusb-win32 before. does this work the way other
> commercial usb drivers work,
> i.e. once you install it (libusb), Can you can remove and reinsert the usb
> device and it will immediately recognise the device?
>
> maybe i have incorrectly assumed how libusb works (and what flexiblity it
> offers ... or not?)
>

The device driver mode is the preferred way of using libusb-win32
driver (libusb0.sys). The filter driver mostly works (even though many
experts say it should not work).
Ref: http://www.osronline.com/showthread.cfm?link=191252

But it is known to not work with some device. We keep it for the
flexibility of the users. In your case, if reboot
works with the filter mode, then you should be happy and
stick to it.


-- 
Xiaofan

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