Re: [Discuss-gnuradio] the program stops unpredictedly

[Minhoo Kim]

Tom,
Thank you for your help first of all.
I actually need the file_source to be replayed, meaning not just repeated
over and over, after the frequency is changed.  I also have to make sure
that the file_source is played just once for each frequency change.  Would
that still not require a stop?
Also, what do you mean by changing the parameters online?  does that mean
while usrp is running?

It does work for a bit then it stops very unpredictedly, and the time it
keeps working is very inconsistent, like I had a case where it stopped
running after like 20 while loops, and there was also a case that it kept
running for like 30 seconds.

Thanks for the help.


Tom Rondeau wrote:
> 
> On Tue, Aug 2, 2011 at 4:55 PM, Minhoo Kim <address@hidden> wrote:
>>
>> Hi all,
>> I can't find out why this program stops running.
> 
> <snip>
> 
>> Sorry if the code is long.
>> In short, the top block just creates a signal, then there is an infinite
>> while loop in the main that just keeps the signal running.
>> I need the infinite loop so I can retune the center frequency every time
>> the
>> program passes through the loop.
>> I made a null_sink block to check if the problem is within creating the
>> signal part, and infinite loop never stopped so i assume the top block is
>> ok.
>> I also tried with start(), stop(), and wait() in the main loop instead of
>> lock and unlock, which still caused the unpredicted stop.
>> I also had other trials, which I forgot about.
>> There are also consistent underruns, which I am not really worried about,
>> as
>> long as the underrun does not cause the stop of the program, since I am
>> not
>> transmitting any meaningful message.
>>
>> Thanks a lot.
> 
> 
> You don't need to stop the flow graph when you are just changing
> frequency. You only really need to stop it if you are disconnecting
> and reconnecting blocks; changing parameters can be done online.
> 
> You said it stops running, but I'm not sure how it stops running? Does
> it work for a bit and then stop, or does it never produce anything at
> all?
> 
> Tom
> 
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> 
> 

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