Hi All,
I’m currently working to synchronize multiple X310’s clocks without a PPS
input, however right now the best method I can find to update the clock from a
host PC (using the C++ API) is to query the current time from the USRP device
(using usrp::multi_usrp::get_time_now), add a time delta to the current time,
then send back the new clock time to the USRP device (using
usrp::multi_usrp::set_time_now). Unfortunately, this method introduces large
timing errors due to the nondeterministic nature of packet processing on both
he CPU and network stack.
I’m wondering if anyone knows of any other techniques for an "in-place" time
update. I.e., is there a method for the host PC to send a time delta to the
USRP which would be added to the clock register in a single operation?
I see there are other get/set_time_now functions in the rfnoc::mb_control and
rfnoc::radio_control classes, but I’m not sure if these would allow me to
accomplish this using only the C++ API. I can’t seem to find much documentation
on this aside from the examples in the “uhd/host/examples/rfnoc*” folder.
If it’s not possible to accomplish this using a purely C++ approach, is it
possible to do this through a custom RFNoC block? I don’t have experience with
RFNoC at the moment and I’m not sure if that register is exposed to user
blocks, or if so, if the register update would be deterministic in time, but if
there’s motivation I would be willing go down the RFNoC path.
Thanks in advance,
Jason
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