[USRP-users] Some general help

Neel Pandeya neel.pandeya at ettus.com
Fri Jul 17 14:31:09 EDT 2015


Hello Michael Kuplicki:

Which USB controller do you have?

--Neel



On 1 July 2015 at 10:22, Michael Kuplicki - US <mkuplicki at caci.com> wrote:

>  Hello Neel,
>
>
>
> That was good advice.  I added  @MYGROUP  - rtprio   99   to
>   /etc/security/limits.conf  and that took care of the lockup problem after
> running tx_samples_from_file.    I still have the problem with not always
> seeing the B200 after a power up.  When I run uhd_find_devices I get the
> loading firmware message but sometimes after that a no devices found
> message.  Although I have been using the RPi for my work, another coworker
> that used this B200 before me said he saw the same behavior.  He saw this
> with his  desktop and laptop.  In his experience after the device is found
> everything is solid.  This may be a problem particular to this board.   Is
> it possible to update the onboard firmware in the B200?
>
> Thanks,
>
> Mike
>
>
>
>
>
> *From:* Neel Pandeya [mailto:neel.pandeya at ettus.com]
> *Sent:* Monday, June 29, 2015 7:14 PM
> *To:* Michael Kuplicki - US
> *Cc:* usrp-users
> *Subject:* Re: [USRP-users] Some general help
>
>
>
> Hello Michael Kuplicki:
>
> There's some documentation at the link below for how to address the UHD
> warning that you're seeing.
>
> http://files.ettus.com/manual/page_general.html#general_threading_prio
>
> I agree with Marcus Müller, what you are seeing is a bit strange. The B200
> should still be able to operate over USB 2.0 with the RPi. Be careful that
> you're not overwhelming the RPI. Perhaps use a very low rate such as ~500
> ksps. Could you try running your B200 with an laptop, preferably with
> Ubuntu 14.04, with USB 3.0, to verify that the board is working correctly?
> Also, I would recommend that you avoid using the master and maint branches
> of UHD, and that you stick to using tagged releases of UHD, such as 3.8.4.
>
>
>
> --Neel
>
>
>
> On 29 June 2015 at 14:54, Marcus
>
> ​​
>
> Müller <usrp-users at lists.ettus.com> wrote:
>
> Hi Mike,
>
> that's all a bit strange; especially the part where you have to reset the
> device a couple of times -- after a loss of power, the device is pretty
> much in a clean slate status.
> So, as a first test, I'd just ask you to try your USRP with your "proper"
> PC, and see if it works normally. The rates you can push through USB2 might
> still be a bit hard on the poor raspbi.
>
> Best regards,
> Marcus
>
> On 06/29/2015 11:19 PM, Michael Kuplicki - US via USRP-users wrote:
>
>  I am running Ubuntu Mate 15.04 on a Raspberry Pi 2.  I am trying to run
> a B200 USRP with this setup, mostly interested in transmitting with the
> B200.  I have been successful in building the uhds and have been able to
> transmit a FM signal I created the IQ data with in Matlab.  My problem is
> that after running  tx_samples_from _file to transmit my data it may not
> work again*.  *tx_samples_from_file seems to run the second time on the
> terminal  but the transmit LED does not come on and no RF signal is
> generated.  I also find that connecting to the device is problematic.
> uhd_find_devices does not always work after a power up reset.  I have to
> reset the hardware with a power cycle a few times before it will take.  The
> Raspberry Pi does not have a USB 3.0 port.  I have tried using external
> power to the B200 but the behavior does not seem to change.  And when
> running tx_samples_from _file  I get two startup messages:
>
>
>
> linux; GNU C++ version 4.9.2; Boost_105500; UHD_003.009.git-171-g51bc00ee
>
>
>
> UHD Warning:
>
>     Unable to set the thread priority. Performance may be negatively
> affected.
>
>     Please see the general application notes in the manual for
> instructions.
>
>     EnvironmentError: OSError: error in pthread_setschedparam
>
>
>
> Any suggestions?
>
> Thanks,
>
> Mike
>
>
>
>
>
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