Hi, The xxx.stop() and xxx.wait() should be called after time.sleep(xxx)
see: http://gnuradio.org/redmine/wiki/gnuradio/TutorialsWritePythonApplications Best Regards, Firas ----- Original Message ---- > From: Andy_Long <luckshiw...@yahoo.com.cn> > To: Discuss-gnuradio@gnu.org > Sent: Fri, April 16, 2010 11:52:57 AM > Subject: Re: re[Discuss-gnuradio] configuring with usrp2 src present > > Hi Firas, But it shows the same error as before. I am doing tests > like that: def main(): t = > my_top_block() > t.start() > t.wait() t.stop() > print t.c2mag.level() #print power > time.sleep(3) > > m = my_top_block() > m.start() > m.wait() > m.stop() print m.c2mag.level() #print > power time.sleep(3) > > n = > my_top_block() > n.start() > n.wait() n.stop() > print n.c2mag.level() #print power > time.sleep(3) > > r = > my_top_block() > r.start() > r.wait() r.stop() > print r.c2mag.level() #print power > time.sleep(3) > > Or I am doing the while loop like that def > main(): while > 1: t = > my_top_block() > t.start() > t.wait() > t.stop() print > t.c2mag.level() #print power > time.sleep(3) error > message >>> > StdErr: usrp2: failed to enable realtime > scheduling 1.43518970096e-07 StdErr: S1.41236599021e-07 StdErr: usrp2: > channel 0 not receiving usrp2::rx_samples() failed 0.0 StdErr: usrp2: > channel 0 not receiving usrp2::rx_samples() failed 0.0 The > thing is that the first output is always fine to print the received power. > After that it will print the power again as expected, however with error > message "StdErr: S". It sometimes can print the power for third time, then > usrp2 collapses with "StdErr: usrp2: channel 0 not > receiving usrp2::rx_samples() failed". However,most of time usrp2 collapses > in the second loop rather than third loop. If it is the problem of > setting the loop of flow graph, I think I can't get the second output or even > third output. Am I right? For example, if I changed the usrp2 source with > constant sine wave, the program runs fine. If it is the problem of > usrp2, I guess I will face the same problem even I am writing my own block > simliary like message sink or gr-bin_statistics sink. Another > question is that can I change the tune delay time in gr-bin_statistics block > to do the same thing such as time.sleep(3)? I just throw all the samples in > next 3 seconds thank you best > regards, Andy > Firas A. wrote: > > Hi, > > > Replace all xxx.run with xxx.start() and put xxx.wait() > followed by > xxx.stop() to stop the flowgraph > > Best > Regards, > > Firas > > > > > > ----- Original Message ---- >> From: Andy_Long < > ymailto="mailto:luckshiw...@yahoo.com.cn"; > href="mailto:luckshiw...@yahoo.com.cn";>luckshiw...@yahoo.com.cn> >> > To: > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org >> > Sent: Thu, April 15, 2010 10:50:39 AM >> Subject: Re: > re[Discuss-gnuradio] configuring with usrp2 src present >> >> > > Hello,Johnathan > > Did I have some misunderstanding about > it? I still >> think the problem is from > USRP2 rather than > flow graph. > For example, I >> made some tests to change the > while loop such as: > > def main(): > > >> > t = my_top_block() > > t.run() > >> print t.c2mag.unmuted(): > #show exceed threshold or not > >> time.sleep(3) > > > m = my_top_block() > > m.run() >> > print m.c2mag.unmuted(): #show > exceed threshold or not >> > time.sleep(3) > > > n = my_top_block() >> > > n.run() > print n.c2mag.unmuted(): #show > >> exceed threshold or not > time.sleep(3) > > > > As same >> condition as before, after two > correct outputs, the third one start > to show >> the > error. > > Thank you. > regards, > Andy > > > > > Johnathan >> Corgan-2 wrote: >> > >> On Wed, Apr 14, 2010 at 12:27, Andy_Long < >> > ymailto="mailto: > href="mailto:luckshiw...@yahoo.com.cn";>luckshiw...@yahoo.com.cn" > >> href="mailto: > href="mailto:luckshiw...@yahoo.com.cn";>luckshiw...@yahoo.com.cn"> > ymailto="mailto:luckshiw...@yahoo.com.cn"; > href="mailto:luckshiw...@yahoo.com.cn";>luckshiw...@yahoo.com.cn> > >> wrote: >> >>> I have faced the same problem. > I try to received the >> limited samples from >>> USRP2 by > using "head"block. It should return a >> -1 and the flow graph > will >>> stop, am I right? >> >> The >> > flowgraph will not only stop, but will end its lifetime. Once >> > >> run() has returned, the flowgraph is no longer usable, or as we > like >> to >> say, further operations on it are > "undefined." >> >> In general, >> starting and > stopping an individual flowgraph should occur >> at the same > >> level of processing as application startup and > shutdown. >> Anything else >> is usually a sign of incorrect > design (though not >> always.) The >> run() method on a > top block is really just a convenient >> way of telling >> > GNU Radio your application has nothing else to do until >> the > flowgraph >> exits. >> >> Can you describe what you > are trying to do? >> >> >> Johnathan >> > >> >> >> > _______________________________________________ >> Discuss-gnuradio > mailing >> list >> >> href="mailto: > ymailto="mailto:Discuss-gnuradio@gnu.org"; > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org"> > ymailto="mailto:Discuss-gnuradio@gnu.org"; > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org >> > >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >> >> > > -- > View this message in > context: >> > http://old.nabble.com/reconfiguring-with-usrp2-src-present-tp27615622p28252256.html > > Sent >> from the GnuRadio mailing list archive at >> > href="http://Nabble.com";> > href="http://Nabble.com";>Nabble.com. > > > > > _______________________________________________ > Discuss-gnuradio > >> mailing list > >> href="mailto: > ymailto="mailto:Discuss-gnuradio@gnu.org"; > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org"> > ymailto="mailto:Discuss-gnuradio@gnu.org"; > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org > > >> href=" > href="http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; target=_blank > >http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; >> > target=_blank >> > > href="http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; target=_blank > >http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > ymailto="mailto:Discuss-gnuradio@gnu.org"; > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org > > href="http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; target=_blank > >http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > -- View this message in context: > http://old.nabble.com/reconfiguring-with-usrp2-src-present-tp27615622p28264537.html Sent > from the GnuRadio mailing list archive at > Nabble.com. _______________________________________________ Discuss-gnuradio > mailing list > href="mailto:Discuss-gnuradio@gnu.org";>Discuss-gnuradio@gnu.org > href="http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; target=_blank > >http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
