On 07/21/2014 02:04 PM, hutiantian wrote: > Hi Martin, > What's the TSB tags? Does the tags have the different types? I think the > tags just a pair of key-value.
http://gnuradio.org/doc/doxygen/page_tagged_stream_blocks.html M > > Thanks > Tiankun > > 于 2014年07月21日 17:54, Martin Braun 写道: >> Before myths about tagged stream blocks start perpetuating the webs: >> TPP_DONT on a tagged stream blocks does the same as on any other type of >> block; however, TSB tags still get through. >> >> A closer inspection of packet_headergenerator_bb (either by reading the >> source code or the manual page >> (http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1packet__headergenerator__bb.html#details) >> >> reveals that the actual processing is done in a separate kernel, the >> header formatter object, which is user-defined. See >> packet_header_default for an example. >> >> M >> >> On 07/20/2014 04:54 PM, Marcus Müller wrote: >>> Hi Tiankun, >>> >>> On 20.07.2014 15:50, hutiantian wrote: >>>> Hi Marcus, >>>> My tx_ofdm.py is gen by tx_ofdm.grc, there are a >>>> 'packet_headergenerator_bb' module in it. This module use >>>> 'set_tag_propagation_policy(TPP_DONT)' to handle tags by itself. >>> Ah ok! >>>> I didn't find any code has touch tags in this module, but when I >>>> connect it to Tag Debug module, I can find the tags output. >>> This is indeed strange. However, packet_headergenerator_bb is a subclass >>> of tagged_stream_block [1]. >>> >>>> In my opinion, if one module use >>>> 'set_tag_propagation_policy(TPP_DONT)', and it does not handle it, >>>> tags will not pass down. >>> That's generally correct, but there's the tagged stream block exception: >>> [1], "A note on tag propagation" tells us that one most of the time >>> would use TPP_DONT to handle all non-length tags, whilst length tags are >>> always passed forward. >>> >>> Hope that helped! >>> >>> Greetings, >>> Marcus >>> >>> >>> [1] http://gnuradio.org/doc/doxygen/page_tagged_stream_blocks.html >>>> >>>> Thanks >>>> Tiankun >>>> >>>> 于 2014年07月20日 21:15, Marcus Müller 写道: >>>>> Hi Tiankun, >>>>> >>>>> what's your GNU Radio version [1]? Where did you find that tx_ofdm.py? >>>>> There is no tx_ofdm.py in my GNU Radio source tree (in none of v3.7.4, >>>>> v3.6.5 or v3.4.2). There is a tx_ofdm.grc, which can be used to >>>>> generate >>>>> a tx_ofdm.py, but that does not (and shouldn't) contain a >>>>> "set_tag_propagation_policy" line. >>>>> >>>>> Greetings, >>>>> Marcus >>>>> >>>>> [1] you can find out by running "gnuradio-config-info -v" >>>>> On 20.07.2014 14:54, Tiankun Hu wrote: >>>>>> Hi Experts, >>>>>> I was reading tx_ofdm.py. I found this module use >>>>>> 'set_tag_propagation_policy(TPP_DONT)' to handle tags by itself, >>>>>> but I >>>>>> cann't find the code that used to handle tag in this module. >>>>>> I knew this module will call 'packet_header_ofdm.header_formatter()' >>>>>> and >>>>>> 'packet_header_default.header_formatter()', but I also cann't find >>>>>> the >>>>>> handle tag code in these functions. >>>>>> Anyone can help me figure out where does this module process tags? >>>>>> >>>>>> Thanks >>>>>> Tiankun >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Discuss-gnuradio mailing list >>>>>> Discuss-gnuradio@gnu.org >>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> Discuss-gnuradio@gnu.org >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>> >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
