root / freemodbus / port / mbcrc.c @ 20e5429c
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1 | 20e5429c | Tom Mullins | /*
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2 | * FreeModbus Libary: ATMega168 Port
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3 | * Copyright (C) 2006 Christian Walter <wolti@sil.at>
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4 | *
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5 | * This library is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU Lesser General Public
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7 | * License as published by the Free Software Foundation; either
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8 | * version 2.1 of the License, or (at your option) any later version.
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9 | *
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10 | * This library is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 | * Lesser General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU Lesser General Public
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16 | * License along with this library; if not, write to the Free Software
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17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18 | *
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19 | * File: $Id: mbcrc.c,v 1.2 2006/05/14 21:55:01 wolti Exp $
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20 | */
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21 | |||
22 | /* ----------------------- System includes ----------------------------------*/
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23 | |||
24 | #include <avr/pgmspace.h> |
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25 | |||
26 | /* ----------------------- Platform includes --------------------------------*/
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27 | #include "port.h" |
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28 | |||
29 | static const PROGMEM UCHAR aucCRCHi[] = { |
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30 | 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, |
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31 | 0x00, 0xC1, 0x81, |
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32 | 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, |
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33 | 0x40, 0x01, 0xC0, |
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34 | 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, |
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35 | 0x81, 0x40, 0x01, |
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36 | 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, |
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37 | 0xC0, 0x80, 0x41, |
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38 | 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, |
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39 | 0x00, 0xC1, 0x81, |
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40 | 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, |
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41 | 0x41, 0x01, 0xC0, |
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42 | 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, |
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43 | 0x80, 0x41, 0x01, |
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44 | 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, |
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45 | 0xC1, 0x81, 0x40, |
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46 | 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, |
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47 | 0x00, 0xC1, 0x81, |
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48 | 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, |
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49 | 0x40, 0x01, 0xC0, |
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50 | 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, |
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51 | 0x81, 0x40, 0x01, |
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52 | 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, |
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53 | 0xC0, 0x80, 0x41, |
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54 | 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, |
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55 | 0x00, 0xC1, 0x81, |
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56 | 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, |
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57 | 0x40, 0x01, 0xC0, |
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58 | 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, |
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59 | 0x80, 0x41, 0x01, |
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60 | 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, |
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61 | 0xC0, 0x80, 0x41, |
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62 | 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, |
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63 | 0x00, 0xC1, 0x81, |
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64 | 0x40
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65 | }; |
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66 | |||
67 | static const PROGMEM UCHAR aucCRCLo[] = { |
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68 | 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, |
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69 | 0x05, 0xC5, 0xC4, |
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70 | 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, |
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71 | 0x0B, 0xC9, 0x09, |
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72 | 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, |
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73 | 0xDF, 0x1F, 0xDD, |
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74 | 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, |
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75 | 0x12, 0x13, 0xD3, |
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76 | 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, |
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77 | 0x36, 0xF6, 0xF7, |
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78 | 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, |
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79 | 0xFE, 0xFA, 0x3A, |
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80 | 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, |
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81 | 0x2A, 0xEA, 0xEE, |
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82 | 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, |
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83 | 0xE7, 0xE6, 0x26, |
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84 | 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, |
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85 | 0x63, 0xA3, 0xA2, |
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86 | 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, |
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87 | 0x6D, 0xAF, 0x6F, |
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88 | 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, |
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89 | 0xB9, 0x79, 0xBB, |
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90 | 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, |
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91 | 0x74, 0x75, 0xB5, |
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92 | 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, |
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93 | 0x50, 0x90, 0x91, |
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94 | 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, |
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95 | 0x54, 0x9C, 0x5C, |
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96 | 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, |
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97 | 0x58, 0x98, 0x88, |
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98 | 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, |
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99 | 0x4D, 0x4C, 0x8C, |
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100 | 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, |
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101 | 0x41, 0x81, 0x80, |
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102 | 0x40
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103 | }; |
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104 | |||
105 | USHORT |
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106 | usMBCRC16( UCHAR * pucFrame, USHORT usLen ) |
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107 | { |
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108 | UCHAR ucCRCHi = 0xFF;
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109 | UCHAR ucCRCLo = 0xFF;
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110 | int iIndex;
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111 | |||
112 | while( usLen-- )
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113 | { |
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114 | iIndex = ucCRCLo ^ *( pucFrame++ ); |
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115 | ucCRCLo = ucCRCHi ^ pgm_read_byte( &aucCRCHi[iIndex] ); |
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116 | ucCRCHi = pgm_read_byte( &aucCRCLo[iIndex] );; |
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117 | } |
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118 | return ucCRCHi << 8 | ucCRCLo; |
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119 | } |