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

[John B. Wood]

On 09/29/2016 11:44 AM, Marcus Müller wrote:
> Hi John,
>
> I really hate to nitpick, but I also feel that I must clarify a few things:
> > 1.  The E310 has to be placed into "network mode", which loads the
> > E310 FPGA with appropriate code.
> No, network mode works with the default (and only) FPGA image – it's
> just a software daemon inside UHD.
Hello, Marcus.  All I can say is that when the E310 is commanded to go 
into network mode a string of messages is issued that indicates the FPGA 
is being loaded to support the network mode. So my conclusion was that 
for network mode the FPGA is loaded with code other than that used when 
booting up.

> > 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.
> Well, if about 1MS/s is enough for you.
These days that's peanuts on a wired LAN, IMHO.  Again, I use a 
dedicated LAN with my E310 so YMMV.

So my recommendations for those who develop SDR apps for the E310:

1.  Compile GRC with network mode enabled on the target platform.

2.  Connect the target platform to the E310 via a wired LAN that is 
shared with few or no other users.

3.  Use GRC on the target platform for flow graph programming and 
automatic Python code generation.

4.  Following debugging, transfer the .py file(s) for the app to the 
E310 and from that point on you don't need the GRC GUI environment 
(unless more changes are required and you don't want to do Python file 
editing directly either on the target platform or while logged on to the 
E310).

5.  Keep in mind that if your E310 apps output real-time graph info 
and/or an audio stream, those things will put noticeable load on your 
network.

At the risk of previously stating the obvious and sincerely,

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