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 <[email protected]> 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 > > [email protected] <javascript:;> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] <javascript:;> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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