Hi,
> On 3 Mar 2017, at 07:15, Nikita Airee <nikit...@iiitd.ac.in> wrote: > > I would like to time synchronize transmission in two USRPs. I understand that > after synchronizing pps and 10MHz, I would have to make use of time tags. For > that I looked to packet_pad_impl in gr-foo. > > When I use the block with a flowgraph, specifically the example flowgraphs in > gr-ieee802-11, it really just blocks the transmission, meaning no data is > transmitted from the USRP. The loopback too doesn't work. Tag debug also > doesn't show the presence of any tags(tx_eob, tx_sob, tx_time etc). > > Is the block not working or am I doing something wrong? If at all I > completely misunderstood the purpose of the block, could you please point me > in the right direction for implementing time tags as well? I don’t get what you mean. Could you please describe a bit more detailed what’s happening. The gr-ieee802-11 flow graph uses “Packet Pad 2”, a Tagged Stream Block that just pads some 0s. It doesn’t block. When you enable the delay option, it will add a “tx_time” tag that can be used to delay the transmission. (The delay is added by the USRP, i.e., also in that case it doesn’t block). Best, Bastian _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
