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List:       libusb-devel
Subject:    Re: [libusb] Two libusb devices for a single physical device
From:       Chris Dickens <christopher.a.dickens () gmail ! com>
Date:       2016-02-23 1:14:09
Message-ID: CAL-1MmXECCr+ouvxVUD=jzXNRgqVDFO8YRMhch=-JUKSc6O2Yw () mail ! gmail ! com
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Hi Jeff,

It should only appear with composite devices on Windows 8 and later.
Microsoft changed the enumeration ordering when using SetupAPI with an
enumerator string. This change results in composite interfaces
appearing before the composite parent device, and apparently the
DeviceIoControl() calls to obtain connection information and
descriptors work just fine on the first interface of a composite
device. This in turn leads libusb to think it has found two distinct
devices.

Regards,
Chris

On Mon, Feb 22, 2016 at 8:50 AM, Jeffrey Nichols
<jsnichols@suprocktech.com> wrote:
> Hi Chris,
>
> That's great news. Do you know what sorts of situations the bug appears
> in? We've been trying to figure out workarounds, but it's never been
> obvious what computers or ports will experience the issue.
>
> Thanks,
> Jeff
>
> Jeffrey Nichols
> Suprock Technologies, LLC
> Phone: (603) 479-3408
> Fax: (888) 629-4158
> www.suprocktech.com
>
> On 2/18/2016 1:51 PM, Chris Dickens wrote:
>> Hi,
>>
>> I've known about this issue for a while and know the cause/solution,
>> just haven't had the time to do it. This will be fixed before the next
>> release.
>>
>> Regards,
>> Chris
>>
>> On Fri, Feb 12, 2016 at 5:08 AM, Xiaofan Chen <xiaofanc@gmail.com> wrote:
>>> On Wed, Feb 10, 2016 at 4:26 AM, Mathieu Pilato <pilatomic@gmail.com> wrote:
>>>> I am simply using
>>>>
>>>> libusb_open_device_with_vid_pid
>>>>
>>>> to connect to my device ( this is only for a POC software )
>>>>
>>>> Running Windows 7, no problem, but with Windows 8 / 10 ,
>>>> it cannot connect to the device, and I get those error messages :
>>>> libusb: error [init_device] device '\\.\USB#VID_28DE&PID_1142&MI_01#7&3B875B47&0&0001' is
>>>> no longer connected!
>>>> libusb: error [init_device] device '\\.\USB#VID_28DE&PID_1142&MI_01#7&3B875B47&0&0001' is
>>>> no longer connected!
>>>>
>>>> So not only it shows multiple times the same device, but it
>>>> also can connect to any of them
>>>>
>>>> I think I might be running into the same issue than you.
>>> I think your issue is different. What is the USB chipset you
>>> are using? Does USBView work for your device?
>>>
>>>
>>>
>>> --
>>> Xiaofan
>>>
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>
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