Hi i spent the past few weeks studying the gnuradio blocks c++ source codes, the doxygen documentation, and the provided examples (specially packet_tx and packet_rx ones) and eventually i managed to understand how packetized transmission, tags and messages work it was easer than i thought initially even if the learning curve is very steep many thanks for your support
now i plan to learn how to write my own blocks based on the existing, using gr_modtool i need to write my own custom header formats bob Le lun. 31 déc. 2018 à 01:28, Julian Arnold <[email protected]> a écrit : > Hey Bob, > > there is plenty of documentation on this topic you can check out under > [1,2]. > Especially, the Header Payload Demuxer (HPD) [3] should be worth a look > if you are dealing with packetized variable length data. > > Hope those pointer can get you started. If you have further questions > after going through those pages, let me know. > > Cheers, > Julian > > [1] https://www.gnuradio.org/doc/doxygen/page_packet_data.html > [2] https://www.gnuradio.org/doc/doxygen/page_packet_comms.html > [3] > > https://www.gnuradio.org/doc/doxygen/classgr_1_1digital_1_1header__payload__demux.html > > On 31.12.18 01:00, Alban Meffre wrote: > > Hi > > I would like to decode a simple GFSK packet > > > > here is the packet structure : > > preamble : AAh x 4 > > sync word : D391h > > length byte : 1 byte > > payload : 1 to 64 bytes > > CRC : 2 bytes > > > > TX : arduino + CC1101 module, 2GFSK, 100kbps, excursion 50kHz, carrier > > 433 MHz > > RX : RTLSDR > > > > until now i was able to demodulate the signal and add a "sync" tag using > > the correlate access code. > > > > my goal is to extract the payload and send it to a file or a socket. > > is there a simple way to do that without writing my own block ? > > > > i can't go further, because i do not manage to find the info i need > > i do not know where to start : stream, tagged stream, PDU, messages, > etc.. > > i do not figure out how to use these tag for variable length. nothing > > clear in the doc > > > > i'd be glad if someone helps me > > best regards > > bob > > > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [email protected] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > -- Alban MEFFRE F4GSW
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