Re: [Discuss-gnuradio] half duplex set_auto_tx timing problems

[Marcus D. Leech]

> You say that it switch from TX to RX if the next timestamp is in the
> future and switch from RX to TX just when the timestamp is triggered.
>
> > > You see "L" because you are sending your bursts far enough advance.  In my
> > > applications, the bursts are sent to the USRP about ~5ms before the actual
> > > transmission.
> Ok, I will try to send them 5ms before transmit time, that should
> work. But then synchronizing the FPGA clock with the PC clock will be
> more trouble.
You can use set_time_now()  to set the FPGA clock to whatever you want.

In fact, without such synchronization of ideas of time, it's pretty hard 
to build a TDMA-type system.  The USRP and the host delivering time-stamped
  samples have to agree on what time it is.  If you have 1PPS pulses 
going in, you can use set_time_next_pps() to align times on the next PPS 
pulse.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org