Re: [Discuss-gnuradio] UHD Source -and- Sink In Same GRC Fl owgraph ?

[mleech]

I'm willing to bet that your segfault comes from our friend OpenGL:

Try this before you start your application:

export "LIBGL_ALWAYS_INDIRECT=1"

 

Also try updating to latest master for Gnu Radio and UHD.  If you're on Ubuntu or Fedora, you can use:

http://www.sbrac.org/files/build-gnuradio

To do the download/build/install/post-install   dance

 

-Marcus

 

On Tue, 21 Feb 2012 19:55:45 +0000, Iain Young, G7III wrote:

> Hi Folks,
>
> I'm having some fun and games with gnuradio, a USRP1, and trying to
> transmit and receive at the same time, using gnuradio-companion.
>
> A Simple [UHD SOURCE] ----> [UHD SINK] works perfectly, but when I
> start to try to do other things, I get a Segmentation Fault from
> somewhere.
>
> Even something as simple as this graph SEGVs on me (Yes, I know it's
> useless, but I cut everything down to as simple as I could to confirm
> the problem wasn't in my flowgraph, and those blocks were already in
> my wonderfully crafted flowgraph!):
>
> [SIGNAL SOURCE 1750Hz] -> [UHD SINK]
> [UHD SOURCE] -> [MULTIPLY CONST] -> [WX_WATERFALL]
>
> It does not seem to matter what antennas or sub devices I
> select (I have twin WBX boards, so am able to switch which
> antennas do what..)
>
> My gnuradio installation is from git, just a few weeks ago, 
> gnuradio-config-info -v shows v3.5.1-43-g309ca769
>
> UHD is from the same date (3rd Feb looking at my datestamps),
> and uhd_find_devices reports:
>
> linux; GNU C++ version 4.6.1; Boost_104601; UHD_003.004.000-5b06adb
>
> for it's version, and does find my URSP as expected with it's
> dual WBX's. USRP Firmware is from 29-11-2011 (latest I found), Base
> system is Ubuntu 12.04.
>
>
> Anyone have any pointers ? Is this a known issue ? Would upgrading
> to the very latest HEAD help me ? Or is there something I need to
> do in code prior to running both a UHD SOURCE and SINK in the same
> flowgraph under grc ?
>
>
> Best Regards
>
> Iain
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio