Re: re[Discuss-gnuradio] configuring with usrp2 src present

[Firas Abbas]

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 <address@hidden>
> To: address@hidden
> 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:address@hidden"; 
> href="mailto:address@hidden";>address@hidden>
>> 
> To: 
> href="mailto:address@hidden";>address@hidden
>> 
> 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:address@hidden";>address@hidden" 
> 
>> href="mailto:
> href="mailto:address@hidden";>address@hidden">
> ymailto="mailto:address@hidden"; 
> href="mailto:address@hidden";>address@hidden> 
> 
>> 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:address@hidden"; 
> href="mailto:address@hidden";>address@hidden">
> ymailto="mailto:address@hidden"; 
> href="mailto:address@hidden";>address@hidden
>> 
> 
>> 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:address@hidden"; 
> href="mailto:address@hidden";>address@hidden">
> ymailto="mailto:address@hidden"; 
> href="mailto:address@hidden";>address@hidden
> 
> 
>> 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:address@hidden"; 
> href="mailto:address@hidden";>address@hidden
> 
> 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:address@hidden";>address@hidden

> href="http://lists.gnu.org/mailman/listinfo/discuss-gnuradio"; target=_blank 
> >http://lists.gnu.org/mailman/listinfo/discuss-gnuradio