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

[Andy_Long]

Hello, Firas,


Yes. I have tried it like that: 

def main():
                t = my_top_block()
                
                while 1:
                        t.start()
                        print t.c2mag.level()
                        time.sleep(3)   
                        t.stop()
                        t.wait()        



The maxmum records of USRP2 output is five. After that usrp2 collapses. I
used "head" block to limit the number of samples I want to colloct. It will
returns a -1 to stop the flow graph. Maybe it caused the problem? But I do
not know how to limit the samples without this block

Thank you.

best regards,
Andy


Error message:


>>> StdErr: usrp2: failed to enable realtime schedulingStdErr: 
2.51469463974e-07
StdErr: S2.75961855481e-07
StdErr: S2.76194623337e-07
StdErr: S2.76736606134e-07
StdErr: S2.67613864975e-07
StdErr: usrp2: channel 0 not receiving
usrp2::rx_samples() failed
2.67613864975e-07
StdErr: usrp2: channel StdErr: 0StdErr:  not receivingStdErr: 
StdErr: usrp2::rx_samples() failedStdErr: 

 





Firas A. wrote:
> 
> 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
>>> 
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>>> 
>> 
>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>> 
>> 
>>> 
>>> 
>> 
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>>> 
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>> 
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