Re: [Discuss-gnuradio] Expected behavior during underruns

[Josh Blum]

> It would be really nice if the send-function in the API have a TDMA
> mode where fragments of samples are dropped when an underrun occur so
> that the majority of the samples are aligned to the
> start_of_burst_time (see above example (1) and (3)). With this
> feature it is not necessary for the programmer to know if an underrun
> has occurred and how to handle this. Instead the programmer knows
> that if an underrun occurred some samples are dropped but the rest of
> the sample are transmitted at the expected time without any offset.
> Is this doable?
> 

This should already be the case. If you timestamp every packet, then the
underflow recovery is handled by hardware. That is, the FPGA will drop
until the timestamp is <= current time, and then wait until the
timestamp == current time, so realignment is automatic.

Are you timestamping every packet? This calculation should be
last_time_spec + time_spec_t(0, num_samps_in_last_packet, host_sample_rate)

Let me know if you are not seeing this behavior.
Thanks,
-Josh