Re: [Libusb-win32-devel] Problems using libusb after installing AVR32 Studio 2.2

[Frank T. <fr...@fr...>]

> The filter driver is known to cause problems. Do you have other
> application which access your device using the native HID API?
> If yes, you can not use the libusb-win32 driver. If no, you can
> use the libusb-win32 driver.
> 
> But it is far better to use native HID API and not libusb-win32
> 0.1 for HID device under Windows.

What kind of problems?  I've read this before but no one has posted details.  
What symptoms should I watch for?

I can't really use the native HID.  The application is available on Windows 
and Linux and I don't particularly want to maintain a Windows HID wrapper.  
Once it is all up and running, it goes fine.  I haven't noticed any problems.


> 
> >>
> >> By the way, even if libusb-win32 listed two DFU device, your
> >> application should not be confused. Why does that happen?
> >
> > It's confused because it doesn't know which device to program.  It started
> > with 1 HID device, 0 DFU devices.  Then the HID device was told to become a
> > DFU device, and suddenly there is 0 HID devices and 2 DFU devices.  It 
claims
> > to the user there is more than 1 device.
> 
> What if you just use the 1st device or just use the 2nd device?

I changed my code so it just programs the first device.  But that isn't a 
suitable fix.  I need to ensure if someone has two devices plugged in, they 
are going to program the write one.


> What does "lsusb -vvv" say about your device under Linux?
> Does it show two DFU device?

Linux is fine.  It only shows 1 device.

I needed AVR32 Studio again, so I reinstalled it.  There is another package, 
the avr32-toolchain (compiler, device programmer, etc) which I think is the 
culprit.  Part of the install installs something called AVR USB - some kind of 
USB drivers.  However, even if I uninstalled it the problem remained.  Any 
idea how to locate and force remove the drivers?  How does windows match the 
PID/VID to the device driver?


> All in all, I suspect this has something to do with the filter
> driver. Uninstall it and see if that helps.

I did that, then my application didn't work.  The libusb debug shows...

LIBUSB_DLL: info: usb_os_find_busses: found bus-0

And that's it.  No devices.  

So, for an application to list all the devices on my computer, what do I 
need?  Just libusb0.dll?  Or libusb0.sys as well.