Re: Here's how to get the N321's LO sharing to work in GNURadio 3.9 with UHD4.1.0.5

Hi,

Thanks! That seems very nice. Could we try upstreaming this? I don't see
any obvious drawbacks to having this in-tree, particularly since your
approach doesn't require modifying UHD.

Best,
Daniel.

El 28/1/22 a las 23:55, Paul Atreides escribió:
> Currently there's no way to use LO sharing with the N321 in gr-uhd.
> The N321 uses an RF Distribution board which has port terminations that
> need to be switched to active outputs when the LO is exported. This
> isn't accessible in gr-uhd.
>
> In order to access the LO distribution enable commands shown here:
> https://kb.ettus.com/USRP_N320/N321_LO_Distribution#UHD_LO_Distribution_Commands
> <https://kb.ettus.com/USRP_N320/N321_LO_Distribution#UHD_LO_Distribution_Commands>
> a function needs to be added to gr-uhd
> All this code below is taken from here:
> https://github.com/daniestevez/uhd/commit/0a6da1a3fd5839b862cac740ed702923ed21b096
> <https://github.com/daniestevez/uhd/commit/0a6da1a3fd5839b862cac740ed702923ed21b096>
> https://github.com/daniestevez/gnuradio/commit/f9909bade86045f379f83001de27317cc261807f
> <https://github.com/daniestevez/gnuradio/commit/f9909bade86045f379f83001de27317cc261807f>
> with the rx switched for tx and source switched for sink
> i also did not modify any UHD code making this a fix that requires ONLY
> modifying gr-uhd
>
> usrp_sink_impl.cc
> voidusrp_sink_impl::set_tx_lo_dist(boolenabled,
> conststd::string&name,
> size_tchan)
>
> {
> #ifdefUHD_USRP_MULTI_USRP_TX_LO_CONFIG_API
> _dev->get_tree()->access<bool>("/blocks/0/Radio#0/dboard/tx_frontends/0/los/lo1/lo_distribution"/::uhd::fs_path(name)
> /"export").set(enabled);
>
> #else
> throwstd::runtime_error("not implemented in this version");
>