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
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