Hi John, Thanks for these examples. I also read that yesterday. Just want to confirm that: 1. TDMA engine is only responsible for extract the time from the rx samples from the USRP resource. 2. The burst gate block schedules the time for the tx samples.
Are they correct? On Mon, Feb 4, 2013 at 11:20 AM, John Malsbury <[email protected]>wrote: > Alex, > > I'm on a machine without GNU Radio installed, so I have to confirm that > I'm actually sending the right examples, but the attahced files may add > some insight. > > The examples were intended for demonstration of the timed streaming > features and currently rely on a 1 PPS signal to provide synchronization > across multiple units. > > -John > > > > > On Mon, Feb 4, 2013 at 8:33 AM, Alex Zhang <[email protected]>wrote: > >> Hi Josh, >> >> Sorry the unclear question. Actually I am asking how the transmitter >> organize the TX samples to the specified time slot.. >> >> >> On Mon, Feb 4, 2013 at 9:45 AM, Josh Blum <[email protected]> wrote: >> >>> >>> >>> On 02/04/2013 01:32 AM, Alex Zhang wrote: >>> > Previously, the pre-cog introduced a simple implementation of TDMA: >>> > http://gnuradio.4.n7.nabble.com/Introduction-to-Pre-Cog-td37906.html >>> > >>> > I read roughly the code in the tdma_engine.py. >>> > For the transmitter, it seems that this tdma_engine works like a >>> throttle >>> > to send the messages to the downstreams only when the time_update is >>> later >>> > than the time_transmit_start. >>> > And these time are computed based on the tags in the incoming items >>> > inserted by upstream block. >>> > My question is that, where does the upstream block get the correct >>> time? I >>> > know that the usrp_sink can get_time_now but it is on the very >>> downstream, >>> > and it is different block which means different thread. >>> > >>> > If my question is not clear, please give your comments. >>> >>> >>> time indication should be coming from the usrp source block. the rx >>> samples are timestamped, which allows the engine to line up with a time >>> slot >>> >>> -josh >>> >>> > >>> > Thanks. >>> > >>> > >>> > >>> > _______________________________________________ >>> > Discuss-gnuradio mailing list >>> > [email protected] >>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> > >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> >> >> -- >> >> Alex, >> *Dreams can come true – just believe.* >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > -- Alex, *Dreams can come true – just believe.*
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