Re: [Discuss-gnuradio] UHD: samples alignment

[Zohair]

Sounds good! I will start working on this tomorrow and if I get it working
that's good. if not, I will wait till you push it.

Thanks a lot.

Zohair

Josh Blum-2 wrote:
> 
>> 1- Is it enough to do this? Shouldn't I tell the USRP2 to start streaming
>> at
>> a specific timestamp? I have looked into the UHD files but wasn't able to
>> spot a function to do this, though.
>>
> 
> yes, the stream_cmd must have a time stamp specified so both usrp2s
> start streaming at the exact same time. Currently, it defaults to
> stream now:
> http://www.ettus.com/uhd_docs/doxygen/html/structuhd_1_1stream__cmd__t.html
> 
> this change will require modifications to the gr-uhd source in the
> call to issue_stream_cmd
> 
>> 2- If I don't use the clock_config, what are the defaults?
>>
> internal ref clock, sma pps
> 
>> 3- In the runtime, how can I print the received packet timestamp to make
>> sure they are aligned?
>>
> 
> print the first metadata.time_spec in the gr-uhd source work function
> 
> should you be willing to wait, I am working on exactly this issue of
> multiple usrp2 alignment and I hope to push something up next week
> when I get it all working.
> 
> -Josh
> 
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> 

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