Re: [Libusb-win32-devel] Using libusb with two or more devices

[Dan E. <dan...@ne...>]

Kjell Eirik Andersen wrote:
>
> Thanks for your reply.
> I now have libusb working perfectly with two equal devices
> simoultanously (they have different serial numbers).
>
> I have done the following observations :
>
> 1. First install one device (which has not been installed before), and
> WinXP prompts for driver.
>
> 2. After succesful driver installation, run this command in a dos box:
> REG ADD HKLM\System\CurrentControlSet\Control\UsbFlags /v
> IgnoreHWSerNum<yourVIDPID> /t REG_BINARY /d 01
>
> 3. It is now possible to insert other equal devices in the same USB
> port, and WinXP will not prompt for driver.
>
> 4. If I insert a device in a different USB port, WinXP prompts for
> driver.
>
> I had no success in avoiding step 4 above, googling the subject hints
> that it wont be possible. My serialnumber is 5 digits, language code is
> 0x0409 (US English).
>
I'm surprised you get reprompted for a driver - you do have unique 
serial numbers?

I was referring to such statements as *http://tinyurl.com/ywb5dc

*Is your serial number correctly formatted as UTF-8, i.e. every other 
character zero? You should see your serial number in the registry ast 
the position I detailed, or in the properties dialogue box for the 
deivce in the device manager.

Dan.