Cameron Rutherford / SDFileSystem

This is a previous version

Dependencies:   FATFileSystem

Fork of SDFileSystem by Neil Thiessen

SDCRC.cpp@27:161fca56a12b, 2017-04-27 (annotated)

Committer:
rrutherford20
Date:
Thu Apr 27 16:45:22 2017 +0000
Revision:
27:161fca56a12b
Parent:
22:3fa5eaf48e81 
Finalized and commented code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
neilt6 18:2286a4e7fa31 1 /* SD/MMC File System Library
neilt6 22:3fa5eaf48e81 2 * Copyright (c) 2016 Neil Thiessen
neilt6 18:2286a4e7fa31 3 *
neilt6 18:2286a4e7fa31 4 * Licensed under the Apache License, Version 2.0 (the "License");
neilt6 18:2286a4e7fa31 5 * you may not use this file except in compliance with the License.
neilt6 18:2286a4e7fa31 6 * You may obtain a copy of the License at
neilt6 18:2286a4e7fa31 7 *
neilt6 18:2286a4e7fa31 8 * http://www.apache.org/licenses/LICENSE-2.0
neilt6 18:2286a4e7fa31 9 *
neilt6 18:2286a4e7fa31 10 * Unless required by applicable law or agreed to in writing, software
neilt6 18:2286a4e7fa31 11 * distributed under the License is distributed on an "AS IS" BASIS,
neilt6 18:2286a4e7fa31 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
neilt6 18:2286a4e7fa31 13 * See the License for the specific language governing permissions and
neilt6 18:2286a4e7fa31 14 * limitations under the License.
neilt6 18:2286a4e7fa31 15 */
neilt6 18:2286a4e7fa31 16
neilt6 18:2286a4e7fa31 17 #include "SDCRC.h"
neilt6 18:2286a4e7fa31 18
neilt6 18:2286a4e7fa31 19 namespace SDCRC
neilt6 18:2286a4e7fa31 20 {
neilt6 18:2286a4e7fa31 21
neilt6 18:2286a4e7fa31 22 namespace
neilt6 18:2286a4e7fa31 23 {
neilt6 18:2286a4e7fa31 24 const char m_Crc7Table[] = {
neilt6 18:2286a4e7fa31 25 0x00, 0x09, 0x12, 0x1B, 0x24, 0x2D, 0x36, 0x3F,
neilt6 18:2286a4e7fa31 26 0x48, 0x41, 0x5A, 0x53, 0x6C, 0x65, 0x7E, 0x77,
neilt6 18:2286a4e7fa31 27 0x19, 0x10, 0x0B, 0x02, 0x3D, 0x34, 0x2F, 0x26,
neilt6 18:2286a4e7fa31 28 0x51, 0x58, 0x43, 0x4A, 0x75, 0x7C, 0x67, 0x6E,
neilt6 18:2286a4e7fa31 29 0x32, 0x3B, 0x20, 0x29, 0x16, 0x1F, 0x04, 0x0D,
neilt6 18:2286a4e7fa31 30 0x7A, 0x73, 0x68, 0x61, 0x5E, 0x57, 0x4C, 0x45,
neilt6 18:2286a4e7fa31 31 0x2B, 0x22, 0x39, 0x30, 0x0F, 0x06, 0x1D, 0x14,
neilt6 18:2286a4e7fa31 32 0x63, 0x6A, 0x71, 0x78, 0x47, 0x4E, 0x55, 0x5C,
neilt6 18:2286a4e7fa31 33 0x64, 0x6D, 0x76, 0x7F, 0x40, 0x49, 0x52, 0x5B,
neilt6 18:2286a4e7fa31 34 0x2C, 0x25, 0x3E, 0x37, 0x08, 0x01, 0x1A, 0x13,
neilt6 18:2286a4e7fa31 35 0x7D, 0x74, 0x6F, 0x66, 0x59, 0x50, 0x4B, 0x42,
neilt6 18:2286a4e7fa31 36 0x35, 0x3C, 0x27, 0x2E, 0x11, 0x18, 0x03, 0x0A,
neilt6 18:2286a4e7fa31 37 0x56, 0x5F, 0x44, 0x4D, 0x72, 0x7B, 0x60, 0x69,
neilt6 18:2286a4e7fa31 38 0x1E, 0x17, 0x0C, 0x05, 0x3A, 0x33, 0x28, 0x21,
neilt6 18:2286a4e7fa31 39 0x4F, 0x46, 0x5D, 0x54, 0x6B, 0x62, 0x79, 0x70,
neilt6 18:2286a4e7fa31 40 0x07, 0x0E, 0x15, 0x1C, 0x23, 0x2A, 0x31, 0x38,
neilt6 18:2286a4e7fa31 41 0x41, 0x48, 0x53, 0x5A, 0x65, 0x6C, 0x77, 0x7E,
neilt6 18:2286a4e7fa31 42 0x09, 0x00, 0x1B, 0x12, 0x2D, 0x24, 0x3F, 0x36,
neilt6 18:2286a4e7fa31 43 0x58, 0x51, 0x4A, 0x43, 0x7C, 0x75, 0x6E, 0x67,
neilt6 18:2286a4e7fa31 44 0x10, 0x19, 0x02, 0x0B, 0x34, 0x3D, 0x26, 0x2F,
neilt6 18:2286a4e7fa31 45 0x73, 0x7A, 0x61, 0x68, 0x57, 0x5E, 0x45, 0x4C,
neilt6 18:2286a4e7fa31 46 0x3B, 0x32, 0x29, 0x20, 0x1F, 0x16, 0x0D, 0x04,
neilt6 18:2286a4e7fa31 47 0x6A, 0x63, 0x78, 0x71, 0x4E, 0x47, 0x5C, 0x55,
neilt6 18:2286a4e7fa31 48 0x22, 0x2B, 0x30, 0x39, 0x06, 0x0F, 0x14, 0x1D,
neilt6 18:2286a4e7fa31 49 0x25, 0x2C, 0x37, 0x3E, 0x01, 0x08, 0x13, 0x1A,
neilt6 18:2286a4e7fa31 50 0x6D, 0x64, 0x7F, 0x76, 0x49, 0x40, 0x5B, 0x52,
neilt6 18:2286a4e7fa31 51 0x3C, 0x35, 0x2E, 0x27, 0x18, 0x11, 0x0A, 0x03,
neilt6 18:2286a4e7fa31 52 0x74, 0x7D, 0x66, 0x6F, 0x50, 0x59, 0x42, 0x4B,
neilt6 18:2286a4e7fa31 53 0x17, 0x1E, 0x05, 0x0C, 0x33, 0x3A, 0x21, 0x28,
neilt6 18:2286a4e7fa31 54 0x5F, 0x56, 0x4D, 0x44, 0x7B, 0x72, 0x69, 0x60,
neilt6 18:2286a4e7fa31 55 0x0E, 0x07, 0x1C, 0x15, 0x2A, 0x23, 0x38, 0x31,
neilt6 18:2286a4e7fa31 56 0x46, 0x4F, 0x54, 0x5D, 0x62, 0x6B, 0x70, 0x79
neilt6 18:2286a4e7fa31 57 };
neilt6 18:2286a4e7fa31 58
neilt6 18:2286a4e7fa31 59 const unsigned short m_Crc16Table[256] = {
neilt6 18:2286a4e7fa31 60 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
neilt6 18:2286a4e7fa31 61 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
neilt6 18:2286a4e7fa31 62 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
neilt6 18:2286a4e7fa31 63 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
neilt6 18:2286a4e7fa31 64 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
neilt6 18:2286a4e7fa31 65 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
neilt6 18:2286a4e7fa31 66 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
neilt6 18:2286a4e7fa31 67 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
neilt6 18:2286a4e7fa31 68 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
neilt6 18:2286a4e7fa31 69 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
neilt6 18:2286a4e7fa31 70 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
neilt6 18:2286a4e7fa31 71 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
neilt6 18:2286a4e7fa31 72 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
neilt6 18:2286a4e7fa31 73 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
neilt6 18:2286a4e7fa31 74 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
neilt6 18:2286a4e7fa31 75 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
neilt6 18:2286a4e7fa31 76 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
neilt6 18:2286a4e7fa31 77 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
neilt6 18:2286a4e7fa31 78 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
neilt6 18:2286a4e7fa31 79 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
neilt6 18:2286a4e7fa31 80 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
neilt6 18:2286a4e7fa31 81 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
neilt6 18:2286a4e7fa31 82 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
neilt6 18:2286a4e7fa31 83 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
neilt6 18:2286a4e7fa31 84 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
neilt6 18:2286a4e7fa31 85 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
neilt6 18:2286a4e7fa31 86 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
neilt6 18:2286a4e7fa31 87 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
neilt6 18:2286a4e7fa31 88 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
neilt6 18:2286a4e7fa31 89 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
neilt6 18:2286a4e7fa31 90 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
neilt6 18:2286a4e7fa31 91 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
neilt6 18:2286a4e7fa31 92 };
neilt6 18:2286a4e7fa31 93 }
neilt6 18:2286a4e7fa31 94
neilt6 18:2286a4e7fa31 95 char crc7(const char* data, int length)
neilt6 18:2286a4e7fa31 96 {
neilt6 18:2286a4e7fa31 97 //Calculate the CRC7 checksum for the specified data block
neilt6 18:2286a4e7fa31 98 char crc = 0;
neilt6 18:2286a4e7fa31 99 for (int i = 0; i < length; i++) {
neilt6 18:2286a4e7fa31 100 crc = m_Crc7Table[(crc << 1) ^ data[i]];
neilt6 18:2286a4e7fa31 101 }
neilt6 18:2286a4e7fa31 102
neilt6 18:2286a4e7fa31 103 //Return the calculated checksum
neilt6 18:2286a4e7fa31 104 return crc;
neilt6 18:2286a4e7fa31 105 }
neilt6 18:2286a4e7fa31 106
neilt6 18:2286a4e7fa31 107 unsigned short crc16(const char* data, int length)
neilt6 18:2286a4e7fa31 108 {
neilt6 18:2286a4e7fa31 109 //Calculate the CRC16 checksum for the specified data block
neilt6 18:2286a4e7fa31 110 unsigned short crc = 0;
neilt6 18:2286a4e7fa31 111 for (int i = 0; i < length; i++) {
neilt6 18:2286a4e7fa31 112 crc = (crc << 8) ^ m_Crc16Table[((crc >> 8) ^ data[i]) & 0x00FF];
neilt6 18:2286a4e7fa31 113 }
neilt6 18:2286a4e7fa31 114
neilt6 18:2286a4e7fa31 115 //Return the calculated checksum
neilt6 18:2286a4e7fa31 116 return crc;
neilt6 18:2286a4e7fa31 117 }
neilt6 18:2286a4e7fa31 118
neilt6 18:2286a4e7fa31 119 }