Re: [Libusbx-devel] libusbx: error [cache_config_descriptors] could not access configuration descriptor

[Tim R. <ti...@pr...>]

Qian Peng wrote:
>
> We have tried the lastest libusb and tested, the problem still exists.

libusb or libusbx?


> We found not only in the device enumeration phase will be stuck,
> sometimes also occur in the bulk transfer phase 995 error code 
> Related log is as follows:
> 2014-09-24 14:17:05:[00000a28]
> os/windows_usb.c:2067:windows_transfer_callback: handling I/O
> completion with errcode 995, size 0
> 2014-09-24 14:17:05:[00000a28]
> os/windows_usb.c:2090:windows_transfer_callback: detected operation
> aborted
>
> Errcode 995 always haunts us, we couldn't find the real cause of the
> problem.
> Could you please give us some ideas or tips to find the cause of the
> problem?

You're going to need to use a bus analyzer.  Your hardware is broken,
and you need to figure out why.  You can try a software analyzer first
(like usblyzer), but I'm guessing you'll need a hardware analyzer to get
to the bottom of this.

-- 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.