Is there a method for accessing a ddc_block_control object from a multi_usrp object? I have been skimming the various RFNoC examples, and it seems the preferred method of accessing RFNoC objects is via the graph API. The problem is I can’t create an RFNoC graph for an existing multi_usrp object without getting a runtime exception.
It looks like in UHD 3.X there was a method get_device3() which gave access to the underlying RFNoC structure. I am using UHD 4.2 with an x310. Perhaps there is a reason that multi_usrp and RFNoC APIs appear mostly orthogonal. The reason I want access to this block directly is it has a set_freq() method that takes a frequency and a timestamp. Currently in my application I use the timed command API to digitally retune at a specified time. The issue that I encounter is I have to ensure that my channels are serialized in time, because if the freq hop timed command for channel A is t0, and channel B is t1, but the packet commanding channel B arrives first, I have to ensure my application holds the B command, waits for the A command to arrive, and issues the A command first. I would really like to be able to issue freq shifts independent of channel, but maintain the proper timestamping. On top of that, I find the set_timed_command API cumbersome. I occasionally crash from longer runs with my application. I don’t have the exact runtime exception name, but it has something to do with a buffer being full and crashing when too many timed commands are issued.
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