Re: [Libusb-win32-devel] HID device problem

[Adam K. <akr...@ro...>]

Xiaofan Chen wrote:
> On 8/24/06, Adam Kropelin <akr...@ro...> wrote:
>> Stephan Meyer wrote:
>>> Have you tried to install/update the driver by using the DLL's
>>> (undocumented) usb_install_driver_np function?
>>
>> FWIW, this technique works fairly well for my HID devices. The only
>> problem I've noticed is that if I install the driver, then unplug the
>> device and plug in a different USB device (but one that still
>> matches my vendor/product spec) libusb does not get assigned to it.
>> Instead the default MS driver is assigned until I either run
>> usb_install_driver_np again or manually "update driver" via the
>> DeviceManager GUI. I'm curious why libusb does not get bound to all
>> subsequent devices that match the spec.
>
> For PICkit 2, it works without a problem. If I unplug and plug
> in the same device,  libusb-win32 device driver is still assigned
> to the device driver. If I unplug a PICkit 2 and plug in another
> PICkit 2, libusb-win32 device driver is still assigned.
>
> PICkit 2 device does not have unique serial number since
> it is not common for a user to have 2 PICkit 2 programmer.
>
> Your device might have different serail number assigned to
> them and this might be the reason. I am not sure though.

Yup, I have different serial numbers and I suspect you are right that is 
the reason for the behavior I am seeing. But I really know nothing about 
driver matching on Windows, so it's just a guess.

--Adam