Crystal clear.. :-) thank you Tom
2009/3/11 Tom Rondeau <trondeau1...@gmail.com> > On Tue, Mar 10, 2009 at 6:48 AM, Vincenzo Pellegrini <wwvi...@gmail.com> > wrote: > > Thanks Tom, > > > > I had looked at it. > > I still have a question. > > > > It looks to me like the blocks down the line receive data from the upper > > ones and do noting with that data (so the state of block's local variable > is > > frozen) but, I mean, there still is data flowing in and out those blocks. > > > > Is this assumption right? > > > > thanks > > again > > > > vincenzo > > Yes, data still flows into the blocks. But, we tell the scheduler that > we have consumed all of the incoming data, but we do not produce any > output data unless the signal line has triggered. This, then, drops > the data from the incoming stream. So data can flow all day long and > be ignored until the trigger line goes high. > > Tom > > > > > > > 2009/3/9 Tom Rondeau <trondeau1...@gmail.com> > >> > >> On Sun, Mar 8, 2009 at 8:20 PM, Vincenzo Pellegrini <wwvi...@gmail.com> > >> wrote: > >> > Hi everybody, > >> > just a very simple question: > >> > is there a clean way in GNURadio to do this > >> > > >> > source-->block1-->block2 > >> > > >> > where: > >> > source sends let's say some gr_complex > >> > block 1 looks for some synchro signal within the flow > >> > > >> > block2 does absolutely nothing (i.e. does not process zeors or > anything, > >> > simply it is frozen) untill block1 says: "well your frame starts here" > >> > and > >> > delivers a vector for block 2 to work upon. > >> > > >> > It would be great if any body who's been doing this sort of things > could > >> > provide some pointer to start from. > >> > > >> > thank you all > >> > > >> > vincenzo > >> > > >> > PS. > >> > If this is not a sane way to arrange a flowgraph for doing > >> > syncronization, > >> > please point me to the sane way... ;-) > >> > Maybe I should only use stream-oriented blocks that decide what to do > >> > and > >> > when, just based on some block internal state? > >> > >> Look at the OFDM code. We did something similar where the data went > >> out port 0 and a flag signal out of port 1. The other guys down the > >> line would not do anything until they saw the flag signal go high. > >> > >> Tom > > > > > > > > -- > > Vincenzo Pellegrini > > > -- Vincenzo Pellegrini
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