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

On Thu, May 1, 2014 at 4:56 AM, daved9000 <[email protected]> wrote:
> Hi,
>
> I am using libusb-win32 'on top of' (in addition to) the Xilinx Platform USB
> Cable II drivers. This is needed to perform JTAG interface support on a
> Gaisler-Aeroflex Sparc Development board. I only use this for a SW JTAG
> debugging i/f. I installed the xilinx drivers (together with there minimum
> footprint FPGA dev environment - required to get the xilinx drivers to
> install and work). I then (per Gaisler instructions / support documents)
> installed libusb-win32. This worked perfect just as advertised ... until i
> unpluged the usb programmer cable. When i plugged it back in, it seems to
> reinstall (per windows 7 device manager), but does NOT work (i get errors
> about iniitiazlation issues, or problems with the JTAG chain, etc) or my
> gasiler i/f sw (grmon) crashes. I reinstalled libusb and was able to get it
> working again, but i could not unplug and then replug the usb programming
> cable without ALSO having to reinstall libusb-win32?
>
> i discovered (later) that if i reboot the PC with usb programming cable
> plugged in, it seems to resolve the issue? but this is not the most
> desireable behavior (limitation).
>
> any help / opinions / suggestions will be much appreciated!

So you are using the filter driver, right? How did you install
the filter driver? Which version of libusb-win32 are
you using? You may need to restart the PC when using
the filter driver.


-- 
Xiaofan

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