Aleksandrs Gumenuks / MaximInterface_Extended

Extended MaximInterface

Dependents:   mbed_DS28EC20_GPIO

Utilities/crc.cpp@10:de4b8812877d, 2020-01-06 (annotated)

Committer:
reARMnimator
Date:
Mon Jan 06 15:54:55 2020 +0000
Revision:
10:de4b8812877d
Parent:
6:a8c83a2e6fa4 
Fixed inappropriate include path.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:f77ad7f72d04 1 /*******************************************************************************
IanBenzMaxim 0:f77ad7f72d04 2 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 0:f77ad7f72d04 3 *
IanBenzMaxim 0:f77ad7f72d04 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 0:f77ad7f72d04 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 0:f77ad7f72d04 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 0:f77ad7f72d04 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 0:f77ad7f72d04 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 0:f77ad7f72d04 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 0:f77ad7f72d04 10 *
IanBenzMaxim 0:f77ad7f72d04 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 0:f77ad7f72d04 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 0:f77ad7f72d04 13 *
IanBenzMaxim 0:f77ad7f72d04 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 0:f77ad7f72d04 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 0:f77ad7f72d04 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 0:f77ad7f72d04 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 0:f77ad7f72d04 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 0:f77ad7f72d04 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 0:f77ad7f72d04 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 0:f77ad7f72d04 21 *
IanBenzMaxim 0:f77ad7f72d04 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 0:f77ad7f72d04 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 0:f77ad7f72d04 24 * Products, Inc. Branding Policy.
IanBenzMaxim 0:f77ad7f72d04 25 *
IanBenzMaxim 0:f77ad7f72d04 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 0:f77ad7f72d04 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 0:f77ad7f72d04 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 0:f77ad7f72d04 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 0:f77ad7f72d04 30 * ownership rights.
IanBenzMaxim 0:f77ad7f72d04 31 *******************************************************************************/
IanBenzMaxim 0:f77ad7f72d04 32
IanBenzMaxim 0:f77ad7f72d04 33 #include "crc.hpp"
IanBenzMaxim 0:f77ad7f72d04 34
IanBenzMaxim 0:f77ad7f72d04 35 namespace MaximInterface {
IanBenzMaxim 0:f77ad7f72d04 36
IanBenzMaxim 0:f77ad7f72d04 37 uint_fast8_t calculateCrc8(uint_fast8_t data, uint_fast8_t crc) {
IanBenzMaxim 0:f77ad7f72d04 38 // See Application Note 27
IanBenzMaxim 0:f77ad7f72d04 39 crc ^= data;
IanBenzMaxim 0:f77ad7f72d04 40 crc &= 0xff;
IanBenzMaxim 0:f77ad7f72d04 41 for (int i = 0; i < 8; i++) {
IanBenzMaxim 0:f77ad7f72d04 42 if (crc & 1) {
IanBenzMaxim 0:f77ad7f72d04 43 crc = (crc >> 1) ^ 0x8c;
IanBenzMaxim 0:f77ad7f72d04 44 } else {
IanBenzMaxim 0:f77ad7f72d04 45 crc = (crc >> 1);
IanBenzMaxim 0:f77ad7f72d04 46 }
IanBenzMaxim 0:f77ad7f72d04 47 }
IanBenzMaxim 0:f77ad7f72d04 48 return crc;
IanBenzMaxim 0:f77ad7f72d04 49 }
IanBenzMaxim 0:f77ad7f72d04 50
IanBenzMaxim 6:a8c83a2e6fa4 51 uint_fast8_t calculateCrc8(span<const uint_least8_t> data, uint_fast8_t crc) {
IanBenzMaxim 6:a8c83a2e6fa4 52 for (span<const uint_least8_t>::index_type i = 0; i < data.size(); ++i) {
IanBenzMaxim 0:f77ad7f72d04 53 crc = calculateCrc8(data[i], crc);
IanBenzMaxim 0:f77ad7f72d04 54 }
IanBenzMaxim 0:f77ad7f72d04 55 return crc;
IanBenzMaxim 0:f77ad7f72d04 56 }
IanBenzMaxim 0:f77ad7f72d04 57
IanBenzMaxim 0:f77ad7f72d04 58 uint_fast16_t calculateCrc16(uint_fast8_t data, uint_fast16_t crc) {
IanBenzMaxim 0:f77ad7f72d04 59 const uint_least8_t oddparity[] = {0, 1, 1, 0, 1, 0, 0, 1,
IanBenzMaxim 0:f77ad7f72d04 60 1, 0, 0, 1, 0, 1, 1, 0};
IanBenzMaxim 0:f77ad7f72d04 61
IanBenzMaxim 0:f77ad7f72d04 62 uint_fast16_t data16 = (data ^ crc) & 0xff;
IanBenzMaxim 0:f77ad7f72d04 63 crc = (crc >> 8) & 0xff;
IanBenzMaxim 0:f77ad7f72d04 64
IanBenzMaxim 0:f77ad7f72d04 65 if (oddparity[data16 & 0xf] ^ oddparity[data16 >> 4]) {
IanBenzMaxim 0:f77ad7f72d04 66 crc ^= 0xc001;
IanBenzMaxim 0:f77ad7f72d04 67 }
IanBenzMaxim 0:f77ad7f72d04 68
IanBenzMaxim 0:f77ad7f72d04 69 data16 <<= 6;
IanBenzMaxim 0:f77ad7f72d04 70 crc ^= data16;
IanBenzMaxim 0:f77ad7f72d04 71 data16 <<= 1;
IanBenzMaxim 0:f77ad7f72d04 72 crc ^= data16;
IanBenzMaxim 0:f77ad7f72d04 73
IanBenzMaxim 0:f77ad7f72d04 74 return crc;
IanBenzMaxim 0:f77ad7f72d04 75 }
IanBenzMaxim 0:f77ad7f72d04 76
IanBenzMaxim 6:a8c83a2e6fa4 77 uint_fast16_t calculateCrc16(span<const uint_least8_t> data,
IanBenzMaxim 0:f77ad7f72d04 78 uint_fast16_t crc) {
IanBenzMaxim 6:a8c83a2e6fa4 79 for (span<const uint_least8_t>::index_type i = 0; i < data.size(); ++i) {
IanBenzMaxim 0:f77ad7f72d04 80 crc = calculateCrc16(data[i], crc);
IanBenzMaxim 0:f77ad7f72d04 81 }
IanBenzMaxim 0:f77ad7f72d04 82 return crc;
IanBenzMaxim 0:f77ad7f72d04 83 }
IanBenzMaxim 0:f77ad7f72d04 84
IanBenzMaxim 0:f77ad7f72d04 85 } // namespace MaximInterface