Hi Zhihong, 4ae7a6015ba719a4720f61cc6f3857de2ebda89f is the commit hash that refers to a specific commit on the GNU Radio repository.
If you built GNU Radio recently (I believe this commit was last August), then you should be OK. -Trip On Wed, Feb 10, 2016 at 6:42 PM, Zhihong Luo <zh...@umich.edu> wrote: > Hi Martin, > > What I want to do is to use the stream command to receive data, put it > into the file, rest for like 2s, then start receiving again. I think I can > do this by using multiple NUM SAMPLE AND DONE commands? > > I don"t really understand the stop() here, I am using it because the > manual seems to say so? Previously, I simply called the issue-stream-cmd > function before the flow graph start, but the file grew large very rapidly, > so I was thinking maybe the stop() is the right way to do it. Now I have no > idea how to call it. > > Sorry, but what is 4ae7a6015ba719a4720f61cc6f3857de2ebda89f ? > > Thanks a lot, > Zhihong > 2016年2月10日星期三，Martin Braun <martin.br...@ettus.com> 写道： > >> Which version are you running? 4ae7a6015ba719a4720f61cc6f3857de2ebda89f >> should fix this issue. >> >> Also, is this really what you want to happen? If you just call >> issue_stream_cmd() with a STOP command, it will stop, but all the data >> will still flow through the graph, instead of getting flushed. >> Especially as you are stopping and starting the flow graph. >> >> My guess is you don't really need stop() here. >> >> Cheers, >> M >> >> >> On 02/10/2016 03:07 PM, Zhihong Luo wrote: >> > Hi All, >> > >> > In the manual, it says to use issue_stream_cmd: >> > >> > After starting the flow graph, the user should call stop() >> > < >> https://gnuradio.org/doc/doxygen/classgr_1_1block.html#a0863bc16f7c84adf4cddf5d53124450e >> >on >> > this block, then issue any desired arbitrary stream_cmd_t structs to the >> > device >> > >> > Therefore, I tried to stop() then issue the stream command, but it ran >> > into segmentation fault. My code is: >> > >> > uhd::stream_cmd_t >> > stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE); >> > size_t num_requested_samples= 10000; >> > stream_cmd.num_samps = size_t(num_requested_samples); >> > stream_cmd.stream_now = true; >> > stream_cmd.time_spec = uhd::time_spec_t(); >> > ... >> > std::cout << "starting flow graph" << std::endl; >> > tb->start(); >> > usrp_source->stop(); >> > usrp_source->issue_stream_cmd (stream_cmd); >> > >> > Even if I delete the issue_stream_cmd line, there is still a >> > segmentation fault. Can someone point out where I made a mistake? >> Thanks. >> > >> > Zhihong Luo >> > >> > >> > _______________________________________________ >> > 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 > >
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