OK, sadly that means I'm even more confused :( packet_decoder doesn't have any CRC checking!
Best regards, Marcus On 21.02.2016 14:20, SangHyuk Kim wrote: > No! I'm using current version. the link was just for showing.! > > 2016-02-21 22:14 GMT+09:00 Marcus Müller <[email protected] > <mailto:[email protected]>>: > > 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 Is there a reason why you used a link to an outdated version of 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 >> <[email protected] <mailto:[email protected]>>: >> >> 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 >>> <[email protected] <mailto:[email protected]>>: >>> >>> 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 >>>> [email protected] <mailto:[email protected]> >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] <mailto:[email protected]> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> >> > >
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