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CRC16 CRC-CCITT (0xFFFF)
在erlang库中，只有erlang:crc32位的，需要16位的，就写了了一下：
在网上找到CRCccitt XModem版本的：
%%%-------------------------------------------------------------------
%%% @author <yunnet>
%%% @copyright (C) 2015,
%%% @doc
%%% CRCccitt XModem(0x0000)
%%% @end
%%% Created : 5 Jan 2015 by <yunnet>
%%%-------------------------------------------------------------------
-module(crc16).
-export([crc16/1,test/0]).
-define(CRCTABLE,
[16#0000, 16#1021, 16#2042, 16#3063, 16#4084, 16#50a5, 16#60c6, 16#70e7,
16#8108, 16#9129, 16#a14a, 16#b16b, 16#c18c, 16#d1ad, 16#e1ce, 16#f1ef,
16#1231, 16#0210, 16#3273, 16#2252, 16#52b5, 16#4294, 16#72f7, 16#62d6,
16#9339, 16#8318, 16#b37b, 16#a35a, 16#d3bd, 16#c39c, 16#f3ff, 16#e3de,
16#2462, 16#3443, 16#0420, 16#1401, 16#64e6, 16#74c7, 16#44a4, 16#5485,
16#a56a, 16#b54b, 16#8528, 16#9509, 16#e5ee, 16#f5cf, 16#c5ac, 16#d58d,
16#3653, 16#2672, 16#1611, 16#0630, 16#76d7, 16#66f6, 16#5695, 16#46b4,
16#b75b, 16#a77a, 16#9719, 16#8738, 16#f7df, 16#e7fe, 16#d79d, 16#c7bc,
16#48c4, 16#58e5, 16#6886, 16#78a7, 16#0840, 16#1861, 16#2802, 16#3823,
16#c9cc, 16#d9ed, 16#e98e, 16#f9af, 16#8948, 16#9969, 16#a90a, 16#b92b,
16#5af5, 16#4ad4, 16#7ab7, 16#6a96, 16#1a71, 16#0a50, 16#3a33, 16#2a12,
16#dbfd, 16#cbdc, 16#fbbf, 16#eb9e, 16#9b79, 16#8b58, 16#bb3b, 16#ab1a,
16#6ca6, 16#7c87, 16#4ce4, 16#5cc5, 16#2c22, 16#3c03, 16#0c60, 16#1c41,
16#edae, 16#fd8f, 16#cdec, 16#ddcd, 16#ad2a, 16#bd0b, 16#8d68, 16#9d49,
16#7e97, 16#6eb6, 16#5ed5, 16#4ef4, 16#3e13, 16#2e32, 16#1e51, 16#0e70,
16#ff9f, 16#efbe, 16#dfdd, 16#cffc, 16#bf1b, 16#af3a, 16#9f59, 16#8f78,
16#9188, 16#81a9, 16#b1ca, 16#a1eb, 16#d10c, 16#c12d, 16#f14e, 16#e16f,
16#1080, 16#00a1, 16#30c2, 16#20e3, 16#5004, 16#4025, 16#7046, 16#6067,
16#83b9, 16#9398, 16#a3fb, 16#b3da, 16#c33d, 16#d31c, 16#e37f, 16#f35e,
16#02b1, 16#1290, 16#22f3, 16#32d2, 16#4235, 16#5214, 16#6277, 16#7256,
16#b5ea, 16#a5cb, 16#95a8, 16#8589, 16#f56e, 16#e54f, 16#d52c, 16#c50d,
16#34e2, 16#24c3, 16#14a0, 16#0481, 16#7466, 16#6447, 16#5424, 16#4405,
16#a7db, 16#b7fa, 16#8799, 16#97b8, 16#e75f, 16#f77e, 16#c71d, 16#d73c,
16#26d3, 16#36f2, 16#0691, 16#16b0, 16#6657, 16#7676, 16#4615, 16#5634,
16#d94c, 16#c96d, 16#f90e, 16#e92f, 16#99c8, 16#89e9, 16#b98a, 16#a9ab,
16#5844, 16#4865, 16#7806, 16#6827, 16#18c0, 16#08e1, 16#3882, 16#28a3,
16#cb7d, 16#db5c, 16#eb3f, 16#fb1e, 16#8bf9, 16#9bd8, 16#abbb, 16#bb9a,
16#4a75, 16#5a54, 16#6a37, 16#7a16, 16#0af1, 16#1ad0, 16#2ab3, 16#3a92,
16#fd2e, 16#ed0f, 16#dd6c, 16#cd4d, 16#bdaa, 16#ad8b, 16#9de8, 16#8dc9,
16#7c26, 16#6c07, 16#5c64, 16#4c45, 16#3ca2, 16#2c83, 16#1ce0, 16#0cc1,
16#ef1f, 16#ff3e, 16#cf5d, 16#df7c, 16#af9b, 16#bfba, 16#8fd9, 16#9ff8,
16#6e17, 16#7e36, 16#4e55, 16#5e74, 16#2e93, 16#3eb2, 16#0ed1, 16#1ef0]).
calcByte(Fcs,B) ->
Idx= ((Fcs bsr 8) band 16#ff) bxor B + 1,
((Fcs bsl 8) band 16#ffff) bxor lists:nth(Idx,?CRCTABLE).
crc16(X) when is_list(X) ->
lists:foldl(fun (B,Fsc)-> calcByte(Fsc,B) end, 16#0, X).
test()->
X="123456789",
Crc = crc16(X),
io:format("crc16(~p) is ~p~n",[X, Crc]).
需要CRC-CCITT (0xFFFF) 版本
%%%-------------------------------------------------------------------
%%% @author <yunnet>
%%% @copyright (C) 2015,
%%% @doc
%%% CRC-CCITT (0xFFFF)
%%% @end
%%% Created : 5 Jan 2015 by <yunnet>
%%%-------------------------------------------------------------------
-module(crc16).
-export([crc16/1,test/0]).
-define(CRCTABLE,
[16#0000, 16#1021, 16#2042, 16#3063, 16#4084, 16#50a5, 16#60c6, 16#70e7,
16#8108, 16#9129, 16#a14a, 16#b16b, 16#c18c, 16#d1ad, 16#e1ce, 16#f1ef,
16#1231, 16#0210, 16#3273, 16#2252, 16#52b5, 16#4294, 16#72f7, 16#62d6,
16#9339, 16#8318, 16#b37b, 16#a35a, 16#d3bd, 16#c39c, 16#f3ff, 16#e3de,
16#2462, 16#3443, 16#0420, 16#1401, 16#64e6, 16#74c7, 16#44a4, 16#5485,
16#a56a, 16#b54b, 16#8528, 16#9509, 16#e5ee, 16#f5cf, 16#c5ac, 16#d58d,
16#3653, 16#2672, 16#1611, 16#0630, 16#76d7, 16#66f6, 16#5695, 16#46b4,
16#b75b, 16#a77a, 16#9719, 16#8738, 16#f7df, 16#e7fe, 16#d79d, 16#c7bc,
16#48c4, 16#58e5, 16#6886, 16#78a7, 16#0840, 16#1861, 16#2802, 16#3823,
16#c9cc, 16#d9ed, 16#e98e, 16#f9af, 16#8948, 16#9969, 16#a90a, 16#b92b,
16#5af5, 16#4ad4, 16#7ab7, 16#6a96, 16#1a71, 16#0a50, 16#3a33, 16#2a12,
16#dbfd, 16#cbdc, 16#fbbf, 16#eb9e, 16#9b79, 16#8b58, 16#bb3b, 16#ab1a,
16#6ca6, 16#7c87, 16#4ce4, 16#5cc5, 16#2c22, 16#3c03, 16#0c60, 16#1c41,
16#edae, 16#fd8f, 16#cdec, 16#ddcd, 16#ad2a, 16#bd0b, 16#8d68, 16#9d49,
16#7e97, 16#6eb6, 16#5ed5, 16#4ef4, 16#3e13, 16#2e32, 16#1e51, 16#0e70,
16#ff9f, 16#efbe, 16#dfdd, 16#cffc, 16#bf1b, 16#af3a, 16#9f59, 16#8f78,
16#9188, 16#81a9, 16#b1ca, 16#a1eb, 16#d10c, 16#c12d, 16#f14e, 16#e16f,
16#1080, 16#00a1, 16#30c2, 16#20e3, 16#5004, 16#4025, 16#7046, 16#6067,
16#83b9, 16#9398, 16#a3fb, 16#b3da, 16#c33d, 16#d31c, 16#e37f, 16#f35e,
16#02b1, 16#1290, 16#22f3, 16#32d2, 16#4235, 16#5214, 16#6277, 16#7256,
16#b5ea, 16#a5cb, 16#95a8, 16#8589, 16#f56e, 16#e54f, 16#d52c, 16#c50d,
16#34e2, 16#24c3, 16#14a0, 16#0481, 16#7466, 16#6447, 16#5424, 16#4405,
16#a7db, 16#b7fa, 16#8799, 16#97b8, 16#e75f, 16#f77e, 16#c71d, 16#d73c,
16#26d3, 16#36f2, 16#0691, 16#16b0, 16#6657, 16#7676, 16#4615, 16#5634,
16#d94c, 16#c96d, 16#f90e, 16#e92f, 16#99c8, 16#89e9, 16#b98a, 16#a9ab,
16#5844, 16#4865, 16#7806, 16#6827, 16#18c0, 16#08e1, 16#3882, 16#28a3,
16#cb7d, 16#db5c, 16#eb3f, 16#fb1e, 16#8bf9, 16#9bd8, 16#abbb, 16#bb9a,
16#4a75, 16#5a54, 16#6a37, 16#7a16, 16#0af1, 16#1ad0, 16#2ab3, 16#3a92,
16#fd2e, 16#ed0f, 16#dd6c, 16#cd4d, 16#bdaa, 16#ad8b, 16#9de8, 16#8dc9,
16#7c26, 16#6c07, 16#5c64, 16#4c45, 16#3ca2, 16#2c83, 16#1ce0, 16#0cc1,
16#ef1f, 16#ff3e, 16#cf5d, 16#df7c, 16#af9b, 16#bfba, 16#8fd9, 16#9ff8,
16#6e17, 16#7e36, 16#4e55, 16#5e74, 16#2e93, 16#3eb2, 16#0ed1, 16#1ef0]).
calcByte(Fcs,B) ->
Idx= ((Fcs bsr 8) band 16#ff) bxor B + 1,
((Fcs bsl 8) band 16#ffff) bxor lists:nth(Idx,?CRCTABLE).
crc16(X) when is_list(X) ->
lists:foldl(fun (B,Fsc)-> calcByte(Fsc,B) end, 16#FFFF, X).
test()->
X="123456789",
Crc = crc16(X),
io:format("crc16(~p) is ~p~n",[X, Crc]).
CRC16 CRC-CCITT (0xFFFF)
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