Bingo, didn't realize they were only incoming at those points in time. Problem solved, thanks Josh!
On Mon, Feb 6, 2012 at 9:18 PM, Josh Blum <j...@ettus.com> wrote: > > > On 02/06/2012 06:13 PM, George Nychis wrote: > > I am trying to read incoming RX timestamps from the UHD sample stream. > I'd > > like to calculate the approximate time a preamble is received in the OFDM > > code. > > > > The issue is that, despite getting incoming frames and preambles, I do > not > > seem to be getting timestamp values. I use get_tags_in_range() on > > "rx_time": > > > https://github.com/gnychis/grforwarder/blob/8f8c4e6cf79a2d635a0eb3bcad9b5ab325f1e373/gr-digital/lib/digital_ofdm_sampler.cc#L78 > > > > However, the size of the rx_time tags is consistently zero: > > > https://github.com/gnychis/grforwarder/blob/8f8c4e6cf79a2d635a0eb3bcad9b5ab325f1e373/gr-digital/lib/digital_ofdm_sampler.cc#L99 > > > > The output of the OFDM receiver code: > > ok: True pktno: 637 n_rcvd: 18 n_right: 17 > > got a preamble, size of time_tags: 0 > > ok: True pktno: 638 n_rcvd: 19 n_right: 18 > > got a preamble, size of time_tags: 0 > > ok: True pktno: 639 n_rcvd: 20 n_right: 19 > > got a preamble, size of time_tags: 0 > > ... > > > > Is there something I am missing to enable the RX timestamp on the > incoming > > samples, or am I not properly reading the stream tag? My branch came > from > > the GR master 4 days ago (309ca769af). > > > > The timestamps are only sent on the very first packet and after overflow > conditions. Are you seeing at least one tag at the very beginning of > streaming? > > -Josh > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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