Re: [Discuss-gnuradio] USRP2 spontaneously dies while transmitting

[Eric Blossom]

On Tue, Aug 04, 2009 at 04:38:56PM -0400, Andrew Lutomirski wrote:
> Hi all-
> 
> Occasionally, while transmitting, my USRP2 will die -- that is, it
> stops reliably transmitting and then it drops off the network and
> doesn't come back until restarted.  Any ideas?  I'm running some
> vaguely recent firmware, but I've also seen this problem with the
> version from the factory.
> 
> (This is one of the beta units, which is supposed to be identical to
> the modern version for these purposes.)
> 
> Here's what triggered it most recently:
> 
> $ tx_samples -i 20 -r -I /data/cal_signal
> Failed to enable realtime scheduling
> usrp2: failed to enable realtime scheduling
> Daughterboard configuration:
>   baseband_freq=0.000000
>        duc_freq=0.000000
>   residual_freq=0.000000
>        inverted=no
> 
> ^C
> $ tx_samples -i 20 -r -I /data/cal_signal
> Failed to enable realtime scheduling
> terminate called after throwing an instance of 'std::runtime_error'
>   what():  No USRPs found on interface eth0
> Aborted
> 
> $ tx_samples -i 20 -r -I /data/cal_signal
> Failed to enable realtime scheduling
> terminate called after throwing an instance of 'std::runtime_error'
>   what():  No USRPs found on interface eth0
> Aborted
> 
> Thanks,
> Andy


First off, I highly suggest that you add yourself to group usrp if
you're not already, then add this line to /etc/security/limits.conf:

  @usrp  - rtprio 50


Do you have the TTL serial port on the USRP2 connected?  If so, what
was the last thing it said?

Eric