On 21/04/2023 04:17, Leon Wabeke wrote:
Hi Marcus
After stripping out the wrappers and replacing variables etc. it looks
like we are using the following lines to attempt to setup the code to
share the LO:
USRP->set_rx_lo_export_enabled(true, USRP->ALL_LOS, 0);
USRP->set_rx_lo_source(“internal”, USRP->ALL_LOS, 0);
USRP->set_rx_lo_export_enabled(true, USRP->ALL_LOS, 0);
USRP->set_rx_lo_source(“companion”, USRP->ALL_LOS, 1);
USRP->set_rx_lo_export_enabled(true, USRP->ALL_LOS, 0);
USRP->set_rx_lo_source(“external”, USRP->ALL_LOS, 2);
USRP->set_rx_lo_export_enabled(true, USRP->ALL_LOS, 0);
USRP->set_rx_lo_source(“external”, USRP->ALL_LOS, 3);
I did wonder about the fact that channel 2 and 3 use “external” and
whether that shouldn’t somehow be “reimport” or “companion” to
indicate it should be sharing the LO, instead of getting an LO from
external to the X310. Or should “external” only be interpreted as
external to the TwinRX daughterboard?
What I am seeing here that is also bothering me is that we are calling
set_rx_lo_export_enabled 4 times with the same settings, with the
intention that it should be setting up each of the channels, to use
channel 0. Should that actually be 0 to 3 or should we be explicitly
be disabling 1 to 3?
Oh, something possibly unrelated is that for the mode where the code
changes frequency after running, I initially tried to do that using a
timed tune request, however I found that after 48 such requests the
firmware crashed as stopped working, then I reverted to the mode of
stopping the streaming and using tune request without a command time.
I know after initialisation we do start at a specific time, but am not
sure if the tune request during initialisation is timed or not.
Leon
The multiple calls to "set_rx_lo_exportr_enabled()" aren't necessary as
far as I know--I've never had to do that. Just the
one call on the LO that you set as "master".
There's no physical support for "LO outside the cabinet" on X310+TwinRx,
so "external" just means external to the card.
You should also make certain that your TwinRx cards are actually wired
correctly for LO-sharing.
https://kb.ettus.com/TwinRX_Getting_Started_Guides
Could you share a error log of when the multiple-timed-commands
"crashes"? That would be very helpful.
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