Hi James, I modified the code, uninstalled then make and install again. But when I tried to generate the C API file (which can be generated before I did all these), it outputs errors:
CMakeFiles/tags.dir/tags.cc.o: In function `_main(int, char**)': tags.cc:(.text+0x892): undefined reference to `gr::uhd::usrp_source::make(uhd::device_addr_t const&, uhd::stream_args_t const&, bool)' collect2: error: ld returned 1 exit status make[2]: *** [apps/tags] Error 1 make[1]: *** [apps/CMakeFiles/tags.dir/all] Error 2 make: *** [all] Error 2 It has errors on usrp_source, which I just modified the code of. I checked the source files, they are the same as Revision 338cfae6. So where can my mistakes be? Thanks in advance. Zhihong On Wed, Feb 10, 2016 at 8:38 PM, James Humphries <[email protected]> wrote: > You can uninstall in the build directory: > > sudo make uninstall > > > > On Wed, Feb 10, 2016 at 8:33 PM, Zhihong Luo <[email protected]> wrote: > >> Hi James, >> >> Actually, the commit was only a month ago, I checked my source code and >> it is different from the revised version. So just to make sure, what I need >> to do is to change the source files (usrp_source_impl.cc, usrp_source.h >> etc), then >> >> mkdir build (under gnuradio/) >> cd build >> cmake .. >> make >> make test >> sudo make install >> >> Then the lib files will be overwritten? Or do I need to delete something >> before doing so? >> >> Thanks, >> Zhihong >> >> On Wed, Feb 10, 2016 at 7:43 PM, James Humphries < >> [email protected]> wrote: >> >>> 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 <[email protected]> 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 <[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] >>>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> > >>>>> >>>>> >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> [email protected] >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> [email protected] >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >> >
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