Hi, thanks! Now it's clear what you're using :) Is there a reason why you used a link to an outdated version of the file from 2011?
Best regards, Marcus On 21.02.2016 14:02, SangHyuk Kim wrote: > I'm using "packet_decoder" (http://goo.gl/7uVDDa) > > > > 2016-02-21 21:51 GMT+09:00 Marcus Müller <marcus.muel...@ettus.com > <mailto:marcus.muel...@ettus.com>>: > > Hi, > > the problem is that the string "packet decoding" doesn't appear > anywhere in the current GNU Radio source code, so I'm still not > sure which block you are using. Also, crc.check_crc32 is used in > two different blocks, so I can't even tell this way what we are > talking about :( > Can you actually make sure twice you got the letter-for-letter > right name of the "packet decoding" block? > > Best regards, > marcis > > > > On 21.02.2016 13:38, SangHyuk Kim wrote: >> Thank Marcus. >> >> "packet decoding" recovers message from received packet >> >> and i got false from crc.py >> >> def check_crc32(s): >> if len(s) < 4: >> return (False, '') >> msg = s[:-4] >> #print "msg = '%s'" % (msg,) >> actual = digital.crc32(msg) >> (expected,) = struct.unpack(">I", s[-4:]) >> #print "actual =", hex(actual), "expected =", hex(expected) >> /*print actual == expected*/ >> return (actual == expected, msg) >> >> 2016-02-21 20:52 GMT+09:00 Marcus Müller >> <marcus.muel...@ettus.com <mailto:marcus.muel...@ettus.com>>: >> >> Dear Sang Hyuk Kim, >> >> what "packet decoding" are you specifically talking about, >> and could you show us the code you've modified? >> >> Best regards, >> Marcus >> >> >> On 21.02.2016 12:32, SangHyuk Kim wrote: >>> Hi, I transmit simple text file using two USRP N210 >>> >>> Tx) >>> file source -> packet encoding -> mod(GMSK) -> usrp sink >>> >>> Rx) >>> usrp source -> demod(GMSK) -> packet decoding -> file sink >>> >>> >>> To make corrupt packet, I tried to modify part of crc check >>> >>> I guess if the crc of received packet doesn't match with >>> original one, receiver would discard the packet. >>> >>> However, I found receiver accepts every packet even if crc >>> check returns 'false'. >>> (I expected receiver accepts packet only pass crc check by >>> 'true') >>> >>> Why it always return false and how can I corrupt packet >>> with other ways ? >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > >
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