[USRP-users] UHD: What do the tx_metadata_t burst parameters mean?
martin.braun at ettus.com
Mon Apr 20 14:04:29 EDT 2015
there is the docs on the structs themselves, plus the page I sent you.
On 18.04.2015 12:32, Raj Bhattacharjea via USRP-users wrote:
> Thank you for the references. Those examples give me a vague idea of
> what these concepts mean. I certainly can't say I have a precise
> definition, or understanding of how the behavior of UHD and/or the USRP
> will change with different uses of the burst parameters. I'll carry on
> by experimentation with the code and delving into the UHD source. I was
> hoping that there was documentation, but it appears that there is not.
> On Tue, Apr 14, 2015 at 3:27 PM, <mleech at ripnet.com
> <mailto:mleech at ripnet.com>> wrote:
> I'd suggest looking at the source for tx_timed_samples.cpp and
> tx_bursts.cpp to get a feel for how this works, as well as
> On 2015-04-14 15:00, Raj Bhattacharjea via USRP-users wrote:
>> What is the meaning of various tx_metadata_t fields in UHD? The
>> documentation is here:
>> This is API documentation explaining what functions and fields
>> exist, but it does not tell me much about the concepts this API is
>> implementing. Is there some document I'm missing that explains the
>> concepts of metadata in UHD, how it is used, and what terms like
>> time_spec and start_of_burst mean, precisely? When should a burst
>> be considered to start? To stop? If I send 20 pulses of a carrier,
>> each 20 microseconds long and separated by 10 microseconds, then
>> sleep for 1 second, then do it again, do I have one burst per
>> second, or 20? What difference does this metadata even make, the
>> samples still go out the TX port regardless of these flags, right?
>> If I don't use the burst start and stop metadata correctly, will
>> the state of the USRP be somehow invalid when I go to TX again
>> later in my application?
>> Raj Bhattacharjea
>> Georgia Institute of Technology
>> School of Electrical and Computer Engineering
>> 404.894.7516 <tel:404.894.7516>
>> USRP-users mailing list
>> USRP-users at lists.ettus.com <mailto:USRP-users at lists.ettus.com>
> Raj Bhattacharjea
> USRP-users mailing list
> USRP-users at lists.ettus.com
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