Re: [USRP-users] Re: N321 LO sharing between RF 0/1

[Daniel Estévez]

El 18/1/22 a las 6:02, Marcus D. Leech escribió:
> On 2022-01-17 23:34, Paul Atreides wrote:
> > Posting on both GNURadio and USRP lists here, since my application 
> > overlaps both gr-uhd/GNURadio and the UHD API.
> > The top-level question is, can gr-uhd support all the necessary 
> > N321-specific commands necessary to export the TX LO from RF0 to RF1? 
> > That would include running the command to set the 1x4 splitter. That's 
> > the one in question.
> >
> > get_device()->get_tree()->access<bool>("mboards/0/dboards/A/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_0/export").set(true) 
> >
> >
> > If not, Marcus suggested using a python snippet. I've used that with 
> > RFNoC before, but how would that work?
> > I'm guessing it would be an "after-init" and then call the python API 
> > for the above (if that command is supported)?
> >
> > Thanks
> Yeah, I'd say "after-init", and have it grab the object name of the usrp 
> object?  Using Pythonic, rather than C++ syntax?

Hi,

In case it helps, in the GNU Radio testbed at the ATA
(https://wiki.gnuradio.org/index.php/GR-ATA_Testbed)
we're using

self.uhd_usrp_source_0.set_lo_export_enabled(True, "lo1", 0)
self.uhd_usrp_source_0.set_rx_lo_dist(True, "LO_OUT_0")
self.uhd_usrp_source_0.set_rx_lo_dist(True, "LO_OUT_1")
self.uhd_usrp_source_0.set_lo_source("external", "lo1", 0)
self.uhd_usrp_source_0.set_lo_source("external", "lo1", 1)
self.uhd_usrp_source_0.set_lo_source("external", "lo1", 2)
self.uhd_usrp_source_0.set_lo_source("external", "lo1", 3)

in a "Main - after init" Python snippet together with these patches:

https://github.com/daniestevez/uhd/commit/0a6da1a3fd5839b862cac740ed702923ed21b096

https://github.com/daniestevez/gnuradio/commit/f9909bade86045f379f83001de27317cc261807f

If someone gets the 1x4 splitter going directly in Python, I would be 
interested in knowing how it's done, since that would save us from 
having to patch UHD and GNU Radio.

Best,
Daniel.

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