If I build an FPGA image that includes a radio and a DDC and use the Gnuradio USRP block to record 2-channel data on pulsed signals at a 1 MHz sample rate it runs fine and the streams are time aligned.
If I build a simple flowgraph with the RFNoC radio+DDC it also runs fine but the samples are mis-aligned in time. If I manually add the line: self.uhd_rfnoc_streamer_radio_0.set_command_time(self.uhd_rfnoc_streame r_radio_0.get_time_now()+uhd.time_spec_t(1.1)) the X310 seems to produce time-aligned streams (although I haven't had much time on that machine) but the E310 sputters with timeouts, overruns, and "oh-noes" and when I do get data the streams are still mis-aligned. I've tried different wait times in the set_command_time and different spp settings but nothing produces 2-channel data with aligned streams. Since I know that the USRP block has managed to get it right with the exact same FPGA load, I've been trying to figure out what it's doing so that I can eventually add my custom block between the radio and the DDC. I set UHD_LOG_CONSOLE_LEVEL=trace to look under the hood but I haven't seen anything helpful. I've tried messing with spp also with no luck. any ideas? _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
