Re: [Discuss-gnuradio] extract timestamp data

[Mattias Kjellsson]

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.
Hi,

As far as I know, there is a timestamp- field in the ethernet- packet 
header. Look in "gnuradio/usrp2/firmware/include/usrp2_eth_packet.h" for 
definitions of the ethernet- structures.
Have a close look at how the headers are combined, and also remember 
that there is a "union u2_subpkt_t", which eased up the programming for 
me a bit.

There is a timestamp- field in "u2_fixed_hdr_t", but I don't know 
exactly how that comes out in the higher levels of the api. I have been 
toled that the lower levels of the code should already be able to handle 
this, but that it hasn't got it's way up all the way through the api 
yet. But that was a month or two ago, maybe someone of the core- 
developers can answer that more precisely.

Best Regards
//Mattias Kjellsson