Sorry, I didn't really get what you meant by "pipe the tagged stream straight into the uhd sink".
On Tue, May 6, 2014 at 2:36 PM, Martin Braun <martin.br...@ettus.com> wrote: > On 06.05.2014 04:44, Hoang Ngo Khac wrote: > >> Hi Martin, and all, >> >> I meant, I want to add tx_sob and tx_eob to tell the USRP Sink to >> start/stop the TX chain. I intend to add tags before the modulation, >> where data type is /byte. /Since the provided block PDU to Tagged Stream >> >> takes message as input, I guess I need to make my own block(s). >> >> > On current master, you can also pipe the tagged stream straight into the > uhd sink. > > M > >> >> On Mon, May 5, 2014 at 7:57 PM, Martin Braun <martin.br...@ettus.com >> <mailto:martin.br...@ettus.com>> wrote: >> >> On 05.05.2014 09:56, Hoang Ngo Khac wrote: >> >> Dear List, >> >> I'm new to stream tags. Could someone help me to understand >> about stream >> tags and know how to use it? >> >> >> Remember that we have a lot tag debugging tools available, such as >> the QT GUI Time Sink and tag debug. >> >> >> 1. In GNU Radio Manual: "A stream tags is generated by a block's >> work >> function and from there on flows the downstream...*until it >> reaches a >> sink*...". >> >> If we use tags to tell the USRP Sink to start/stop the TX chain, >> do we >> need to modify the USRP Sink block? >> >> >> Probably not... are you talking about tx_sob and tx_eob? >> >> >> I found that gr_uhd_usrp_sink.cc file contains the >> get_tags_in_range() >> function. However, this file is not, at first, in the GNU Radio >> 3.7.0 >> source folder. How to add this to project and make it work with >> USRP Sink? >> >> >> Look in gr-uhd/, there it is. >> >> >> 2. I am implementing a model of ofdm-based two-way relaying >> network >> apply network coding. Up to now, each single transmission in one >> time >> slot are done, but the model runs without any timing >> synchronization. >> For this, I need to use TDMA, and stream tags is the solution. I >> list >> here the steps to make TDMA with stream tags. Could you leave some >> comments if I miss some thing? >> + Add tags to stream; using provided block such as PDU to Tagged >> Stream, >> or custom block. >> + Write a block for error checking, repeat request... >> >> >> Seems right. You shouldn't need other blocks to control UHD. >> >> M >> >> >> _________________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> >> https://lists.gnu.org/mailman/__listinfo/discuss-gnuradio >> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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