[srslte-users] After some testing, LIBUSB_TRANSFER_ERROR from uhd_rx_nogui

Ismael Gomez ismael.gomez at softwareradiosystems.com
Thu Jun 2 16:50:12 UTC 2016


We have also experienced some differences depending on the USB controller.
Some gives errors more frequently than others.

On Thu, 2 Jun 2016 at 14:56 Enes ÜNAL <aenesunal at gmail.com> wrote:

> It seems not applying args to radio solves the problem.
>
> I just commented out "srslte/lib/rf/rf_uhd_imp.c:249".
>
> Without setting args, I did not get any error while opening the radio,
> however; srsUE sometimes hangs, and just quit.
>
> Is setting frame_sizes the problem, or those somehow makes libusb not
> working, or overflow on kernel buffers?
>
> Hope it helps to resolve the issue,
>
> Thanks,
> Enes.
>
> 2 Haz 2016 Per, 09:51 tarihinde, Enes ÜNAL <aenesunal at gmail.com> şunu
> yazdı:
>
>> Thanks for your response.
>>
>> Best,
>> Enes.
>>
>> On Thu, Jun 2, 2016, 09:50 Ismael Gomez <
>> ismael.gomez at softwareradiosystems.com> wrote:
>>
>>> Yes this is a known issue
>>>
>>> On Thu, 2 Jun 2016, 08:46 Enes ÜNAL, <aenesunal at gmail.com> wrote:
>>>
>>>> Hello dear srsLTE users,
>>>>
>>>> After multiple (not at the same time) runs of srsUE, I got
>>>>
>>>> ############
>>>> Error opening RX stream: 44
>>>> No compatible RF frontend found
>>>> Error opening RF device
>>>> Failed to find device auto with args auto
>>>> ############
>>>>
>>>> Since the message is not descriptive enough, I tried to open official
>>>> uhd application ie. uhd_rx_nogui. As I expected, it gave an error whatever
>>>> the configuration. The error is as follows:
>>>>
>>>> ############
>>>> thread[thread-per-block[0]: <block gr uhd usrp source (2)>]:
>>>> RuntimeError: usb rx6 transfer status: LIBUSB_TRANSFER_ERROR
>>>> ############
>>>>
>>>> When I tried to open uhd_rx_nogui multiple times, I could not generate
>>>> the same error. It seems it's a libusb failure but libusb isn't whom
>>>> responsible for the issue.
>>>>
>>>> I think the problem is originated from srsLTE, maybe wrong arguments or
>>>> maybe unsuccessfully closed the libusb transfer stream.
>>>>
>>>> Is it a known issue, or am I the only one who saw it? The issue is gone
>>>> everytime I plugged out USB and plugged in again.
>>>>
>>>> Thanks, Best.
>>>> Enes.
>>>>
>>>
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