1 //========================================================================== 2 // 3 // crc16.c 4 // 5 // 16 bit CRC with polynomial x^16+x^12+x^5+1 6 // 7 //========================================================================== 8 //####ECOSGPLCOPYRIGHTBEGIN#### 9 // ------------------------------------------- 10 // This file is part of eCos, the Embedded Configurable Operating System. 11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. 12 // Copyright (C) 2002 Gary Thomas 13 // 14 // eCos is free software; you can redistribute it and/or modify it under 15 // the terms of the GNU General Public License as published by the Free 16 // Software Foundation; either version 2 or (at your option) any later version. 17 // 18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY 19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or 20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 21 // for more details. 22 // 23 // You should have received a copy of the GNU General Public License along 24 // with eCos; if not, write to the Free Software Foundation, Inc., 25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 26 // 27 // As a special exception, if other files instantiate templates or use macros 28 // or inline functions from this file, or you compile this file and link it 29 // with other works to produce a work based on this file, this file does not 30 // by itself cause the resulting work to be covered by the GNU General Public 31 // License. However the source code for this file must still be made available 32 // in accordance with section (3) of the GNU General Public License. 33 // 34 // This exception does not invalidate any other reasons why a work based on 35 // this file might be covered by the GNU General Public License. 36 // 37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. 38 // at http://sources.redhat.com/ecos/ecos-license/ 39 // ------------------------------------------- 40 //####ECOSGPLCOPYRIGHTEND#### 41 //========================================================================== 42 //#####DESCRIPTIONBEGIN#### 43 // 44 // Author(s): gthomas 45 // Contributors: gthomas,asl 46 // Date: 2001-01-31 47 // Purpose: 48 // Description: 49 // 50 // This code is part of eCos (tm). 51 // 52 //####DESCRIPTIONEND#### 53 // 54 //========================================================================== 55 56 #if 0 57 #include <cyg/crc/crc.h> 58 #else 59 #include "cyg_crc.h" 60 #endif 61 62 // Table of CRC constants - implements x^16+x^12+x^5+1 63 static const cyg_uint16 crc16_tab[] = { 64 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 65 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 66 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 67 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 68 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 69 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 70 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 71 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 72 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 73 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 74 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 75 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 76 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 77 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 78 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 79 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 80 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 81 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 82 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 83 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 84 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 85 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 86 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 87 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 88 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 89 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 90 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 91 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 92 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 93 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 94 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 95 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, 96 }; 97 98 cyg_uint16 99 cyg_crc16(void *ptr, int len) 100 { 101 unsigned char *buf = ptr; 102 int i; 103 cyg_uint16 cksum; 104 105 cksum = 0; 106 for (i = 0; i < len; i++) { 107 cksum = crc16_tab[((cksum>>8) ^ *buf++) & 0xFF] ^ (cksum << 8); 108 } 109 return cksum; 110 } 111 112
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