Re: [Discuss-gnuradio] extract timestamp data

[Douglas Geiger]

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Cocuzzo, Daniel C. wrote:
> I'm also wondering about how to extract ethernet packet information,
> such as timestamp. If anyone has any pointers to reference materials it
> would be greatly appreciated.
> 
> Thanks,
> Dan
> 
> 

 The easiest way (depending on what you are doing with the timestamps)
is probably by dealing with the low-level libusrp2, and writing a custom
copy handler (look at rx_streaming_samples.cc in usrp2/host/apps). The
metadata structure (in usrp2/metadata.h) provides the timestamp from the
fpga.
 I'm playing around right now with creating a custom source block that
has access to the timestamps (i.e. the copy handler passes it from the
low-level library into the source block - but not to the rest of the
flowgraph). I'm only interested in it as far as providing aligned
samples from two USRP2 (like usrp_multi does for the USRP1). Depending
on what you need the timestamps for, that may be the way to go.
 Doug

- --
Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University
http://cspl.okstate.edu
address@hidden
address@hidden
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