On 06/01/2012 10:07 AM, Alex Zhang wrote: > Hello Josh, > > I am testing this solution. But before I get the result, just want to make > sure: > Does the stream command STREAM_MODE_STOP_CONTINUOUS stop the incoming > packets from the USRP to PC, or just stop the flow graph to receive the > packets from USRP while the packets are still coming into the PC thru the > ethernet between USRP and PC? >
Yup, the usrp->stop() calls STREAM_MODE_STOP_CONTINUOUS, which actually stops the flow of packets from USRP to host. -josh > On Thu, May 31, 2012 at 1:28 PM, Josh Blum <j...@ettus.com> wrote: > >> >> >> On 05/30/2012 06:33 PM, Alex Zhang wrote: >>> Hi, >>> >>> In my applications, after the flow graph is initialized, I need to >>> dynamically control the receiving of the USRP samples, i.e, at time T1, I >>> want the USRP to transfer the received samples to PC, while in T2, I do >> not >>> allow the PC to receive these samples. >>> Stop receiving the unusing packets from USRP can save the traffic over >>> ethernet and decrease the demands of processing resource on host PC. >>> >>> the gr_mute block seems only suppress the incoming packets to further >>> processing, but these unusing samples can still come into the flow graph. >>> >>> Also, the tb.run and tb.wait can be executed more than twice as wish, but >>> it seems to be not so flexible. It would be good if there some commands >>> called to control the block of uhd.usrp_source to achieve such purpose? >>> >>> >> >> >> I had a post on this recently, wish I could find it in the archives... >> >> So, the problem with stopping streaming is that the work function will >> return zero and the scheduler marks the block as done. >> >> So, if you take this changeset here. You should be able to stop and >> restart a running USRP without problem. >> http://gnuradio.org/cgit/jblum.git/log/?h=wip_uhd_stopper >> >> Use the following methods on the block: >> >> usrp->start() >> usrp->stop() >> and if you want to be precise about time, call >> usrp->set_stream_time(...) before calling start() >> >> -josh >> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
