So to tune two USRP N210s connected by a MIMO cable, I should set the command time to be some time spec, and then re-tune both channels to the same frequency, thus giving them the same phase offset?
i.e. My code is looking more like: self.cmd_time = self.uhd_usrp_source_0.uhd.time_spec_t(.1) self.uhd_usrp_source_0.set_command_time(self.cmd_time) self.uhd_usrp_source_0.set_center_freq(freq, 0) self.uhd_usrp_source_0.set_center_freq(freq, 1) self.uhd_usrp_source_0.clear_command_time() The phases are still off... Is my method incorrect? On Fri, Jun 22, 2012 at 1:36 PM, Josh Blum <j...@ettus.com> wrote: > > > On 06/22/2012 10:18 AM, Alexander Olihovik wrote: > > For get_time_now(), would I need to swig multi_usrp.hpp? > > Everything you see in these headers should be available in python: > http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/include > > -josh > > > > > On Fri, Jun 22, 2012 at 12:19 PM, Josh Blum <j...@ettus.com> wrote: > > > >> > >> > >> On 06/22/2012 07:33 AM, Alexander Olihovik wrote: > >>> Hi all, > >>> I'm having some trouble using the C++ UHD API for writing Python code. > >>> I understand that the code has been SWIG'd from C++ to Python. > >>> > >>> > >>> Specifically, the C++ code I want to convert to Python is: > >>> --------------------------------------- > >>> uhd::stream_cmd_t > >>> stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE); > >>> stream_cmd.num_samps = samps_to_recv; > >>> stream_cmd.stream_now = false; > >>> stream_cmd.time_spec = time_to_recv; > >>> usrp->issue_stream_cmd(stream_cmd); > >>> > >> > >> Stream command is not swigged because the control of streaming is part > >> of gnuradio's scheduler. So start() and stop() get automatically called > >> by the scheduler. For convenience this is a set_command_time() to > >> control stream_cmd.time_spec. > >> > >> Basically, gnuradio is handling the streaming for you. Think block-based > >> streaming model. > >> > >>> uhd::time_spec_t cmd_time = usrp->get_time_now() + > uhd::time_spec_t(0.1); > >>> usrp->set_command_time(cmd_time); > >>> usrp->set_rx_freq(1.03e9, 0/*ch0*/); > >>> usrp->set_rx_freq(1.03e9, 1/*ch1*/); > >>> usrp->set_clear_time(); > >> > >> This part is swigged. > >> > >> -josh > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> Discuss-gnuradio@gnu.org > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > > > > > > >
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