Re: [Discuss-gnuradio] Setting USRP's AGC Through GNU Radio's USRP Source

Hi Gilad, I have been using a python block to do automatic gain control to the USRP (x310 in my case).

Please take a look at https://gist.github.com/wheberth/a358dac24fecbb9dcfb7035e66d2ca85 and see if it is useful to you.

Best Regards

Em ter., 17 de out. de 2017 às 21:39, Julian Arnold <julian@elitecoding.org> escreveu:

Hey, 

I created a test branch for the AGC a few years ago. It should still work. You can find it here:

https://github.com/jarn0ld/gnuradio/tree/jarnold/b2xx_agc?files=1

Cheers,

Julian

Julian Arnold, M.Sc

Institute for Networked Systems 

RWTH-Aachen University

Kackertstrasse 9
52072 Aachen
Germany

On 17. Oct 2017, at 17:01, Martin Braun <martin.braun@ettus.com> wrote:

On 10/17/2017 01:16 AM, Gilad Beeri (ApolloShield) wrote:

Hi,

I'm not sure whether this question should be posted in this mailing list

or in usrp-users.

The USRP Source has a method called get_device() which returns an

internal pointer to the multi_usrp. The internal USRP object has a

method of set_rx_agc().

How can I access it through Python?

Assuming src is a USRP Source block,

src.get_device() returns: <Swig Object of type

'::uhd::usrp::multi_usrp::sptr *' at 0x7f250bf30300>

You cannot. We don't SWIG the multi_usrp object.

but then the returned object (dev) has no interesting functions

(only 'acquire', 'append', 'disown', 'next', 'own').

Is there a way to control the USRP B2xx's AGC (AD936x's AGC) through

Python? If not, what should I change in the source code to make it happen?

You can extend usrp_source and usrp_sink to include AGC-controlling
methods. Mostly, they're simple forwards to the underlying multi_usrp call.

Cheers,
Martin

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