Re: [Discuss-gnuradio] GNU flow graph containing a UHD block - unable to detect USRP E310

[John B. Wood]

On 09/28/2016 05:53 AM, John Smith wrote:
> I have an E310 device connected over an Ethernet link to a laptop running GNU 
> Radio.
> When I attempted to execute a GNU flow graph containing a UHD block, I got the 
> following error:
>
> RuntimeError: LookupError: KeyError: No devicesfound for -----> Empty Device 
> Address
>
>
> I have entered the device IP address in the UHD block.
>
> I can ping the E310.
>
> Any help much appreciated.
Hello, and I feel your pain.  To add what other posters may have indicated:

1.  The E310 has to be placed into "network mode", which loads the E310 
FPGA with appropriate code.  This mode is not implemented by default 
when the E310 is booted up.

2.  The UHD driver version in both the E310 and the networked platform 
with GRC must be the same version.

3.  Ettus encourages the running of GRC on the E310 rather than an 
external computer.  That is understandable from a network load 
perspective.  OTOH, if you have a dedicated test LAN, which may consist 
of just the E310 and the GRC computer, this shouldn't be an issue.  For 
programming test and debugging, I prefer having the network mode on my 
E310 since running an SDR application that outputs sound is easier to do 
on an external computer using its sound card and speakers.  Also the GUI 
of GRC seems to be more readable when GRC is running on the external 
computer as opposed to running an SSH -X session to the E310.  I also 
find that if an SDR application defined by the GRC flow graph/Python 
code is designed to output real time graphical info it seems to be less 
clunky when GRC is run external to the E310.  My .02 worth. Sincerely,