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

[Kjell E. A. <kje...@ta...>]

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=20
>>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=20
>>character zero? You should see your serial number in the registry ast=20
>>the position I detailed, or in the properties dialogue box for the=20
>>deivce in the device manager.

>>Dan.

My serial num's are unique and correctly formated, and I see them in the
registry.

Looks like if I skip entering the IgnoreHWSerNum key, I don't get
reprompted when moving the same device from port to port. But in this
case I'm repromted when plugging in a new device with different serial
no.

If I do enter the IgnoreHWSerNum key, I get reprompted when moving the
same device from port to port. But in this case I'm not repromted when
plugging in a new device with different serial no.

Seems to me that I can't have it both ways ! (one and only one driver
install).

Best regards,
Kjell Eirik