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From: | SangHyuk Kim |
Subject: | Re: [Discuss-gnuradio] CRC check |
Date: | Sun, 21 Feb 2016 22:02:10 +0900 |
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 == expectedreturn (actual == expected, msg)
2016-02-21 20:52 GMT+09:00 Marcus Müller <address@hidden>:
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 ?
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