On 06/16/2013 02:13 PM, Adeel Anwar wrote: >> so i checked the new grextras wiki it has uhd_control block i guess that > can be used for this job. > uhd_control block supports only a subset of usrp-functions (exposed > through gr-uhd) e.g. "set_command_time", set/get_gain/freq etc BUT > currently it doesn't support "set_time_now()" > https://github.com/guruofquality/grextras/blob/master/lib/uhd_control_port.cpp >
I didnt add every possible setting. But I am happy to add more on request! I'm gathering that someone would like to make a configuration and control block that could perform the synchronization tasks w/ a GPSDO or some external clock and time source. The intention of the UHDControlPort block was to help clean up much of the messy control logic in pre-cog. We were passing messages into a python block that was executing python functions onto the flowgraph. Sure it worked though :-) But now there is an API to do configuration and control nicely. My intention with the UHDControlPort was to allow for frequency hopping control in a programatic way (and other stuff too). The UHDControlPort block uses the property interface to expose device properties that can be set by another entity -- like some sort of configuration block. https://github.com/guruofquality/gras/wiki/Properties So lets say the control block intended to frequency hop and perform a new transmission: 1) This control block would find the UHDControlPort in the element tree (you would probably do this once in the notify_active() callback). 2) The control block calls uhd_control_block->set("command_time", t0); uhd_control_block->set("tx_freq", new_freq); 3) The control block now causes a time-tagged message to be sent to the transmit chain. control_block -> packet_framer -> modulator -> usrp_sink The time of the transmission would be t0 + some delta to allow the command of tuning the frontend to have settle time. -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
