Hi, I am starting to develop more complicated RFNoC graphs and several questions occurred to me. I am using my own C++ application with the UHD RFNoC-enabled library.
Consider a receive-only RFNoC graph with 2 radio blocks feeding a 2-input, 2-output Add/Sub block. Also, assume there are two rx_streamers connected to the 2 output ports of the Add/Sub block. Note that these streams are no longer independent or one-to-one matched with the radio channels. 1) How does an "issue_stream_cmd()" to one of the Add/Sub block ports propagate back to the radio block? Actually, it would need to propagate back to both Radio blocks no matter which rx_streamer I used since they are no longer independent streams. Does this make sense? 2) What happens if I only call "issue_stream_cmd()" for one of the rx_streamers instead of both? Perhaps since the other streamer isn't running, it backpressures the streaming such that it eventually quits and thus quits for the other port as well? 3) Do I have to do anything in the Add/Sub block to sync up the streams or can I rely on the first sample from Radio 0 being time-aligned with the first sample from Radio 1 (assuming I issued timed start commands)? Rob
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