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
