Re: [Discuss-gnuradio] How to delete and create a new top_block?

[Patrik Eliardsson]

Hi Josh,
> Can you try this diff, I think it solves the problem if my 
> hunch above is correct: http://pastebin.com/zMCP6LHh

Thanks four your reply!

I've tried this patch and I don't get the error anymore, but my application 
still doesn't work though. It seems that the UHD-source doesn't produce any 
samples after that I've stopped and created a new top_block.

I've done three tests where I use your patch and I also added a printf when I'm 
in that state.

1) UHD source (2 USRP2) -> HEAD(1024 samples) -> FILE_SINK
The USRP2s are synchronized. The output files contains the number of samples I 
expected. Everything is fine.

2) UHD source (2 USRP2) -> FILE_SINK
The USRP2s are synchronized. After I stopped and created a new top_block 2-3 
times I see my printf from the ERROR_CODE_TIMEOUT state and the output files 
are empty after that. I expected that all output files should contain at least 
some samples.

2) UHD source (2 USRP2) -> FILE_SINK
The USRP2s are NOT synchronized. All my output files contains some samples as I 
expected. Everything is fine.

My conclusion from these small tests is that the ERROR_CODE_TIMEOUT occurs when 
the USRP2s are synchronized. I don't see the reason why it works with the HEAD 
block and not without it. Do you have any clue? I attach my test file for 
testcase 2.

Br
Patrik

top_block.py
Description: top_block.py