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

[Paul Atreides]

Daniel,
I have added the UHD API calls necessary to turn the transmit LO Distribution 
board ports on and off through python snippets. I did this in a way that does 
not require modifying UHD itself, only gr-uhd. I’ll send more details later 
when I’m in front of that machine. 



<end transmission>

> On Jan 18, 2022, at 17:07, Daniel Estévez <daniel@destevez.net> wrote:
> 
> Hi Paul,
> 
> Would this work if you run these calls before the gr-uhd code in the 
> flowgraph instances the device? This can be tested by inserting the code 
> manually. It could be a solution, but I'm not even sure if you can insert a 
> Python snippet in that location. However, if gr-uhd resets these settings 
> when initializing the device, then this approach won't work.
> 
> Best,
> Daniel.
> 
>> El 18/1/22 a las 22:59, Paul Atreides escribió:
>> wow, thanks Daniel!
>> I just bumped an issue on the GNURadio github here 
>> <https://github.com/gnuradio/gnuradio/issues/5104> I've cross-linked my 
>> comments to gr-ATA as well.
>> <https://github.com/gnuradio/gnuradio/issues/5104>
>> the python code i'm using to enable the LO distro in the UHD python API is:
>> import uhd
>> import numpy as np
>> usrp = uhd.usrp.MultiUSRP()
>> usrp.get_tree().access_bool("/blocks/0/Radio#0/dboard/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_0/export").set(True)
>> usrp.get_tree().access_bool("/blocks/0/Radio#0/dboard/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_1/export").set(True)
>> usrp.get_tree().access_bool("/blocks/0/Radio#0/dboard/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_2/export").set(True)
>> i'm not sure how to work that into a python snippet yet as I think gr-uhd 
>> will claim the radio once the graph is started.