[libhid-discuss] Unable to connect to USB device at the second run.

[Johan Uiterwijk Winkel]

Hello Peter,

We where already afraid that it might be a bug in the firmware. The
device is working without problems with windows, but I suspect that
windows is initializing the device only once. Thanx for the pointer to
the libusb list. I will check the thread.

Kind regards,

Johan Uiterwijk Winkel.


Peter Stuge wrote:
> Johan Uiterwijk Winkel wrote:
>   
>> When the test programm is run for the second time most of the time
>> we are unable to connect to the device.
>>     
>
> This is almost exclusively caused by a bug in device firmware.
>
>
>   
>> Resetting the USB device using libusb also does not solve the
>> problem.
>>     
>
> It is not possible to reset a USB device from software. The closest
> you can come is to manipulate the hub which the device is connected
> to and make it tepmorarily remove power from the right port, but
> there is no API for doing this.
>
>
> IIRC the thread on the libusb list ended with the discovery that the
> device firmware could not handle a configuration request when it was
> already configured, but please do check the archive. I believe it was
> discussed in the last three or four months.
>
>
> //Peter
>
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