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drivers/MbedCRC.h@172:65be27845400, 2019-02-20 (annotated)
- Committer:
- AnnaBridge
- Date:
- Wed Feb 20 20:53:29 2019 +0000
- Revision:
- 172:65be27845400
- Parent:
- 171:3a7713b1edbc
mbed library release version 165
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
AnnaBridge | 165:d1b4690b3f8b | 1 | /* mbed Microcontroller Library |
AnnaBridge | 165:d1b4690b3f8b | 2 | * Copyright (c) 2018 ARM Limited |
AnnaBridge | 172:65be27845400 | 3 | * SPDX-License-Identifier: Apache-2.0 |
AnnaBridge | 165:d1b4690b3f8b | 4 | * |
AnnaBridge | 165:d1b4690b3f8b | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
AnnaBridge | 165:d1b4690b3f8b | 6 | * you may not use this file except in compliance with the License. |
AnnaBridge | 165:d1b4690b3f8b | 7 | * You may obtain a copy of the License at |
AnnaBridge | 165:d1b4690b3f8b | 8 | * |
AnnaBridge | 165:d1b4690b3f8b | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
AnnaBridge | 165:d1b4690b3f8b | 10 | * |
AnnaBridge | 165:d1b4690b3f8b | 11 | * Unless required by applicable law or agreed to in writing, software |
AnnaBridge | 165:d1b4690b3f8b | 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
AnnaBridge | 165:d1b4690b3f8b | 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
AnnaBridge | 165:d1b4690b3f8b | 14 | * See the License for the specific language governing permissions and |
AnnaBridge | 165:d1b4690b3f8b | 15 | * limitations under the License. |
AnnaBridge | 165:d1b4690b3f8b | 16 | */ |
AnnaBridge | 165:d1b4690b3f8b | 17 | #ifndef MBED_CRC_API_H |
AnnaBridge | 165:d1b4690b3f8b | 18 | #define MBED_CRC_API_H |
AnnaBridge | 165:d1b4690b3f8b | 19 | |
AnnaBridge | 165:d1b4690b3f8b | 20 | #include "drivers/TableCRC.h" |
Anna Bridge |
169:a7c7b631e539 | 21 | #include "hal/crc_api.h" |
AnnaBridge | 165:d1b4690b3f8b | 22 | #include "platform/mbed_assert.h" |
AnnaBridge | 171:3a7713b1edbc | 23 | #include "platform/SingletonPtr.h" |
AnnaBridge | 171:3a7713b1edbc | 24 | #include "platform/PlatformMutex.h" |
AnnaBridge | 165:d1b4690b3f8b | 25 | |
AnnaBridge | 165:d1b4690b3f8b | 26 | /* This is invalid warning from the compiler for below section of code |
AnnaBridge | 165:d1b4690b3f8b | 27 | if ((width < 8) && (NULL == _crc_table)) { |
AnnaBridge | 165:d1b4690b3f8b | 28 | p_crc = (uint32_t)(p_crc << (8 - width)); |
AnnaBridge | 165:d1b4690b3f8b | 29 | } |
AnnaBridge | 165:d1b4690b3f8b | 30 | Compiler warns of the shift operation with width as it is width=(std::uint8_t), |
AnnaBridge | 165:d1b4690b3f8b | 31 | but we check for ( width < 8) before performing shift, so it should not be an issue. |
AnnaBridge | 165:d1b4690b3f8b | 32 | */ |
AnnaBridge | 165:d1b4690b3f8b | 33 | #if defined ( __CC_ARM ) |
AnnaBridge | 165:d1b4690b3f8b | 34 | #pragma diag_suppress 62 // Shift count is negative |
AnnaBridge | 165:d1b4690b3f8b | 35 | #elif defined ( __GNUC__ ) |
AnnaBridge | 165:d1b4690b3f8b | 36 | #pragma GCC diagnostic push |
AnnaBridge | 165:d1b4690b3f8b | 37 | #pragma GCC diagnostic ignored "-Wshift-count-negative" |
AnnaBridge | 170:e95d10626187 | 38 | #elif defined (__ICCARM__) |
AnnaBridge | 170:e95d10626187 | 39 | #pragma diag_suppress=Pe062 // Shift count is negative |
AnnaBridge | 165:d1b4690b3f8b | 40 | #endif |
AnnaBridge | 165:d1b4690b3f8b | 41 | |
AnnaBridge | 165:d1b4690b3f8b | 42 | namespace mbed { |
AnnaBridge | 165:d1b4690b3f8b | 43 | /** \addtogroup drivers */ |
AnnaBridge | 165:d1b4690b3f8b | 44 | /** @{*/ |
AnnaBridge | 165:d1b4690b3f8b | 45 | |
AnnaBridge | 165:d1b4690b3f8b | 46 | /** CRC object provides CRC generation through hardware/software |
AnnaBridge | 165:d1b4690b3f8b | 47 | * |
AnnaBridge | 165:d1b4690b3f8b | 48 | * ROM polynomial tables for supported polynomials (:: crc_polynomial_t) will be used for |
AnnaBridge | 165:d1b4690b3f8b | 49 | * software CRC computation, if ROM tables are not available then CRC is computed runtime |
AnnaBridge | 165:d1b4690b3f8b | 50 | * bit by bit for all data input. |
AnnaBridge | 171:3a7713b1edbc | 51 | * @note Synchronization level: Thread safe |
AnnaBridge | 165:d1b4690b3f8b | 52 | * |
AnnaBridge | 165:d1b4690b3f8b | 53 | * @tparam polynomial CRC polynomial value in hex |
AnnaBridge | 165:d1b4690b3f8b | 54 | * @tparam width CRC polynomial width |
AnnaBridge | 165:d1b4690b3f8b | 55 | * |
AnnaBridge | 165:d1b4690b3f8b | 56 | * Example: Compute CRC data |
AnnaBridge | 165:d1b4690b3f8b | 57 | * @code |
AnnaBridge | 165:d1b4690b3f8b | 58 | * |
AnnaBridge | 165:d1b4690b3f8b | 59 | * #include "mbed.h" |
AnnaBridge | 165:d1b4690b3f8b | 60 | * |
AnnaBridge | 165:d1b4690b3f8b | 61 | * int main() { |
AnnaBridge | 165:d1b4690b3f8b | 62 | * MbedCRC<POLY_32BIT_ANSI, 32> ct; |
AnnaBridge | 165:d1b4690b3f8b | 63 | * |
AnnaBridge | 165:d1b4690b3f8b | 64 | * char test[] = "123456789"; |
AnnaBridge | 165:d1b4690b3f8b | 65 | * uint32_t crc = 0; |
AnnaBridge | 165:d1b4690b3f8b | 66 | * |
AnnaBridge | 165:d1b4690b3f8b | 67 | * printf("\nPolynomial = 0x%lx Width = %d \n", ct.get_polynomial(), ct.get_width()); |
AnnaBridge | 165:d1b4690b3f8b | 68 | * |
AnnaBridge | 165:d1b4690b3f8b | 69 | * ct.compute((void *)test, strlen((const char*)test), &crc); |
AnnaBridge | 165:d1b4690b3f8b | 70 | * |
AnnaBridge | 165:d1b4690b3f8b | 71 | * printf("The CRC of data \"123456789\" is : 0x%lx\n", crc); |
AnnaBridge | 165:d1b4690b3f8b | 72 | * return 0; |
AnnaBridge | 165:d1b4690b3f8b | 73 | * } |
AnnaBridge | 165:d1b4690b3f8b | 74 | * @endcode |
AnnaBridge | 165:d1b4690b3f8b | 75 | * Example: Compute CRC with data available in parts |
AnnaBridge | 165:d1b4690b3f8b | 76 | * @code |
AnnaBridge | 165:d1b4690b3f8b | 77 | * |
AnnaBridge | 165:d1b4690b3f8b | 78 | * #include "mbed.h" |
AnnaBridge | 165:d1b4690b3f8b | 79 | * int main() { |
AnnaBridge | 165:d1b4690b3f8b | 80 | * MbedCRC<POLY_32BIT_ANSI, 32> ct; |
AnnaBridge | 165:d1b4690b3f8b | 81 | * |
AnnaBridge | 165:d1b4690b3f8b | 82 | * char test[] = "123456789"; |
AnnaBridge | 165:d1b4690b3f8b | 83 | * uint32_t crc = 0; |
AnnaBridge | 165:d1b4690b3f8b | 84 | * |
AnnaBridge | 165:d1b4690b3f8b | 85 | * printf("\nPolynomial = 0x%lx Width = %d \n", ct.get_polynomial(), ct.get_width()); |
AnnaBridge | 165:d1b4690b3f8b | 86 | * ct.compute_partial_start(&crc); |
AnnaBridge | 165:d1b4690b3f8b | 87 | * ct.compute_partial((void *)&test, 4, &crc); |
AnnaBridge | 165:d1b4690b3f8b | 88 | * ct.compute_partial((void *)&test[4], 5, &crc); |
AnnaBridge | 165:d1b4690b3f8b | 89 | * ct.compute_partial_stop(&crc); |
AnnaBridge | 165:d1b4690b3f8b | 90 | * printf("The CRC of data \"123456789\" is : 0x%lx\n", crc); |
AnnaBridge | 165:d1b4690b3f8b | 91 | * return 0; |
AnnaBridge | 165:d1b4690b3f8b | 92 | * } |
AnnaBridge | 165:d1b4690b3f8b | 93 | * @endcode |
AnnaBridge | 165:d1b4690b3f8b | 94 | * @ingroup drivers |
AnnaBridge | 165:d1b4690b3f8b | 95 | */ |
AnnaBridge | 165:d1b4690b3f8b | 96 | |
AnnaBridge | 171:3a7713b1edbc | 97 | extern SingletonPtr<PlatformMutex> mbed_crc_mutex; |
AnnaBridge | 171:3a7713b1edbc | 98 | |
AnnaBridge | 170:e95d10626187 | 99 | template <uint32_t polynomial = POLY_32BIT_ANSI, uint8_t width = 32> |
AnnaBridge | 170:e95d10626187 | 100 | class MbedCRC { |
Anna Bridge |
169:a7c7b631e539 | 101 | |
Anna Bridge |
169:a7c7b631e539 | 102 | public: |
AnnaBridge | 172:65be27845400 | 103 | enum CrcMode { |
AnnaBridge | 172:65be27845400 | 104 | #if DEVICE_CRC |
AnnaBridge | 171:3a7713b1edbc | 105 | HARDWARE = 0, |
AnnaBridge | 171:3a7713b1edbc | 106 | #endif |
AnnaBridge | 171:3a7713b1edbc | 107 | TABLE = 1, |
AnnaBridge | 171:3a7713b1edbc | 108 | BITWISE |
AnnaBridge | 171:3a7713b1edbc | 109 | }; |
AnnaBridge | 171:3a7713b1edbc | 110 | |
AnnaBridge | 165:d1b4690b3f8b | 111 | typedef uint64_t crc_data_size_t; |
AnnaBridge | 165:d1b4690b3f8b | 112 | |
AnnaBridge | 165:d1b4690b3f8b | 113 | /** Lifetime of CRC object |
AnnaBridge | 165:d1b4690b3f8b | 114 | * |
AnnaBridge | 165:d1b4690b3f8b | 115 | * @param initial_xor Inital value/seed to Xor |
AnnaBridge | 165:d1b4690b3f8b | 116 | * @param final_xor Final Xor value |
AnnaBridge | 165:d1b4690b3f8b | 117 | * @param reflect_data |
AnnaBridge | 165:d1b4690b3f8b | 118 | * @param reflect_remainder |
AnnaBridge | 171:3a7713b1edbc | 119 | * @note Default constructor without any arguments is valid only for supported CRC polynomials. :: crc_polynomial_t |
AnnaBridge | 165:d1b4690b3f8b | 120 | * MbedCRC <POLY_7BIT_SD, 7> ct; --- Valid POLY_7BIT_SD |
AnnaBridge | 165:d1b4690b3f8b | 121 | * MbedCRC <0x1021, 16> ct; --- Valid POLY_16BIT_CCITT |
AnnaBridge | 165:d1b4690b3f8b | 122 | * MbedCRC <POLY_16BIT_CCITT, 32> ct; --- Invalid, compilation error |
AnnaBridge | 171:3a7713b1edbc | 123 | * MbedCRC <POLY_16BIT_CCITT, 32> ct (i,f,rd,rr) Constructor can be used for not supported polynomials |
AnnaBridge | 165:d1b4690b3f8b | 124 | * MbedCRC<POLY_16BIT_CCITT, 16> sd(0, 0, false, false); Constructor can also be used for supported |
AnnaBridge | 165:d1b4690b3f8b | 125 | * polynomials with different intial/final/reflect values |
AnnaBridge | 165:d1b4690b3f8b | 126 | * |
AnnaBridge | 165:d1b4690b3f8b | 127 | */ |
AnnaBridge | 165:d1b4690b3f8b | 128 | MbedCRC(uint32_t initial_xor, uint32_t final_xor, bool reflect_data, bool reflect_remainder) : |
AnnaBridge | 170:e95d10626187 | 129 | _initial_value(initial_xor), _final_xor(final_xor), _reflect_data(reflect_data), |
AnnaBridge | 171:3a7713b1edbc | 130 | _reflect_remainder(reflect_remainder) |
AnnaBridge | 165:d1b4690b3f8b | 131 | { |
AnnaBridge | 165:d1b4690b3f8b | 132 | mbed_crc_ctor(); |
AnnaBridge | 165:d1b4690b3f8b | 133 | } |
AnnaBridge | 165:d1b4690b3f8b | 134 | MbedCRC(); |
AnnaBridge | 165:d1b4690b3f8b | 135 | virtual ~MbedCRC() |
AnnaBridge | 165:d1b4690b3f8b | 136 | { |
AnnaBridge | 165:d1b4690b3f8b | 137 | // Do nothing |
AnnaBridge | 165:d1b4690b3f8b | 138 | } |
AnnaBridge | 165:d1b4690b3f8b | 139 | |
AnnaBridge | 165:d1b4690b3f8b | 140 | /** Compute CRC for the data input |
AnnaBridge | 171:3a7713b1edbc | 141 | * Compute CRC performs the initialization, computation and collection of |
AnnaBridge | 171:3a7713b1edbc | 142 | * final CRC. |
AnnaBridge | 165:d1b4690b3f8b | 143 | * |
AnnaBridge | 165:d1b4690b3f8b | 144 | * @param buffer Data bytes |
AnnaBridge | 165:d1b4690b3f8b | 145 | * @param size Size of data |
AnnaBridge | 165:d1b4690b3f8b | 146 | * @param crc CRC is the output value |
AnnaBridge | 165:d1b4690b3f8b | 147 | * @return 0 on success, negative error code on failure |
AnnaBridge | 165:d1b4690b3f8b | 148 | */ |
AnnaBridge | 165:d1b4690b3f8b | 149 | int32_t compute(void *buffer, crc_data_size_t size, uint32_t *crc) |
AnnaBridge | 165:d1b4690b3f8b | 150 | { |
AnnaBridge | 165:d1b4690b3f8b | 151 | MBED_ASSERT(crc != NULL); |
AnnaBridge | 171:3a7713b1edbc | 152 | int32_t status = 0; |
AnnaBridge | 171:3a7713b1edbc | 153 | |
AnnaBridge | 171:3a7713b1edbc | 154 | status = compute_partial_start(crc); |
AnnaBridge | 171:3a7713b1edbc | 155 | if (0 != status) { |
AnnaBridge | 171:3a7713b1edbc | 156 | unlock(); |
AnnaBridge | 165:d1b4690b3f8b | 157 | return status; |
AnnaBridge | 165:d1b4690b3f8b | 158 | } |
AnnaBridge | 171:3a7713b1edbc | 159 | |
AnnaBridge | 171:3a7713b1edbc | 160 | status = compute_partial(buffer, size, crc); |
AnnaBridge | 171:3a7713b1edbc | 161 | if (0 != status) { |
AnnaBridge | 171:3a7713b1edbc | 162 | unlock(); |
AnnaBridge | 165:d1b4690b3f8b | 163 | return status; |
AnnaBridge | 165:d1b4690b3f8b | 164 | } |
AnnaBridge | 171:3a7713b1edbc | 165 | |
AnnaBridge | 171:3a7713b1edbc | 166 | status = compute_partial_stop(crc); |
AnnaBridge | 171:3a7713b1edbc | 167 | if (0 != status) { |
AnnaBridge | 172:65be27845400 | 168 | *crc = 0; |
AnnaBridge | 165:d1b4690b3f8b | 169 | } |
AnnaBridge | 171:3a7713b1edbc | 170 | |
AnnaBridge | 171:3a7713b1edbc | 171 | return status; |
AnnaBridge | 171:3a7713b1edbc | 172 | |
AnnaBridge | 165:d1b4690b3f8b | 173 | } |
AnnaBridge | 165:d1b4690b3f8b | 174 | |
AnnaBridge | 165:d1b4690b3f8b | 175 | /** Compute partial CRC for the data input. |
AnnaBridge | 165:d1b4690b3f8b | 176 | * |
AnnaBridge | 165:d1b4690b3f8b | 177 | * CRC data if not available fully, CRC can be computed in parts with available data. |
AnnaBridge | 171:3a7713b1edbc | 178 | * |
AnnaBridge | 171:3a7713b1edbc | 179 | * In case of hardware, intermediate values and states are saved by hardware. Mutex |
AnnaBridge | 171:3a7713b1edbc | 180 | * locking is used to serialize access to hardware CRC. |
AnnaBridge | 171:3a7713b1edbc | 181 | * |
AnnaBridge | 171:3a7713b1edbc | 182 | * In case of software CRC, previous CRC output should be passed as argument to the |
AnnaBridge | 171:3a7713b1edbc | 183 | * current compute_partial call. Please note the intermediate CRC value is maintained by |
AnnaBridge | 171:3a7713b1edbc | 184 | * application and not the driver. |
AnnaBridge | 171:3a7713b1edbc | 185 | * |
AnnaBridge | 171:3a7713b1edbc | 186 | * @pre: Call `compute_partial_start` to start the partial CRC calculation. |
AnnaBridge | 171:3a7713b1edbc | 187 | * @post: Call `compute_partial_stop` to get the final CRC value. |
AnnaBridge | 165:d1b4690b3f8b | 188 | * |
AnnaBridge | 165:d1b4690b3f8b | 189 | * @param buffer Data bytes |
AnnaBridge | 165:d1b4690b3f8b | 190 | * @param size Size of data |
AnnaBridge | 165:d1b4690b3f8b | 191 | * @param crc CRC value is intermediate CRC value filled by API. |
AnnaBridge | 165:d1b4690b3f8b | 192 | * @return 0 on success or a negative error code on failure |
AnnaBridge | 171:3a7713b1edbc | 193 | * @note: CRC as output in compute_partial is not final CRC value, call `compute_partial_stop` |
AnnaBridge | 165:d1b4690b3f8b | 194 | * to get final correct CRC value. |
AnnaBridge | 165:d1b4690b3f8b | 195 | */ |
AnnaBridge | 165:d1b4690b3f8b | 196 | int32_t compute_partial(void *buffer, crc_data_size_t size, uint32_t *crc) |
AnnaBridge | 165:d1b4690b3f8b | 197 | { |
AnnaBridge | 171:3a7713b1edbc | 198 | int32_t status = 0; |
AnnaBridge | 171:3a7713b1edbc | 199 | |
AnnaBridge | 170:e95d10626187 | 200 | switch (_mode) { |
AnnaBridge | 172:65be27845400 | 201 | #if DEVICE_CRC |
AnnaBridge | 171:3a7713b1edbc | 202 | case HARDWARE: |
Anna Bridge |
169:a7c7b631e539 | 203 | hal_crc_compute_partial((uint8_t *)buffer, size); |
Anna Bridge |
169:a7c7b631e539 | 204 | *crc = 0; |
AnnaBridge | 171:3a7713b1edbc | 205 | break; |
AnnaBridge | 171:3a7713b1edbc | 206 | #endif |
Anna Bridge |
169:a7c7b631e539 | 207 | case TABLE: |
AnnaBridge | 171:3a7713b1edbc | 208 | status = table_compute_partial(buffer, size, crc); |
AnnaBridge | 171:3a7713b1edbc | 209 | break; |
Anna Bridge |
169:a7c7b631e539 | 210 | case BITWISE: |
AnnaBridge | 171:3a7713b1edbc | 211 | status = bitwise_compute_partial(buffer, size, crc); |
AnnaBridge | 171:3a7713b1edbc | 212 | break; |
AnnaBridge | 171:3a7713b1edbc | 213 | default: |
AnnaBridge | 171:3a7713b1edbc | 214 | status = -1; |
AnnaBridge | 171:3a7713b1edbc | 215 | break; |
AnnaBridge | 165:d1b4690b3f8b | 216 | } |
Anna Bridge |
169:a7c7b631e539 | 217 | |
AnnaBridge | 171:3a7713b1edbc | 218 | return status; |
AnnaBridge | 165:d1b4690b3f8b | 219 | } |
AnnaBridge | 165:d1b4690b3f8b | 220 | |
AnnaBridge | 171:3a7713b1edbc | 221 | /** Compute partial start, indicate start of partial computation. |
AnnaBridge | 165:d1b4690b3f8b | 222 | * |
AnnaBridge | 165:d1b4690b3f8b | 223 | * This API should be called before performing any partial computation |
AnnaBridge | 165:d1b4690b3f8b | 224 | * with compute_partial API. |
AnnaBridge | 165:d1b4690b3f8b | 225 | * |
AnnaBridge | 165:d1b4690b3f8b | 226 | * @param crc Initial CRC value set by the API |
AnnaBridge | 165:d1b4690b3f8b | 227 | * @return 0 on success or a negative in case of failure |
AnnaBridge | 165:d1b4690b3f8b | 228 | * @note: CRC is an out parameter and must be reused with compute_partial |
AnnaBridge | 171:3a7713b1edbc | 229 | * and `compute_partial_stop` without any modifications in application. |
AnnaBridge | 165:d1b4690b3f8b | 230 | */ |
AnnaBridge | 165:d1b4690b3f8b | 231 | int32_t compute_partial_start(uint32_t *crc) |
AnnaBridge | 165:d1b4690b3f8b | 232 | { |
AnnaBridge | 165:d1b4690b3f8b | 233 | MBED_ASSERT(crc != NULL); |
Anna Bridge |
169:a7c7b631e539 | 234 | |
AnnaBridge | 172:65be27845400 | 235 | #if DEVICE_CRC |
Anna Bridge |
169:a7c7b631e539 | 236 | if (_mode == HARDWARE) { |
AnnaBridge | 171:3a7713b1edbc | 237 | lock(); |
Anna Bridge |
169:a7c7b631e539 | 238 | crc_mbed_config_t config; |
Anna Bridge |
169:a7c7b631e539 | 239 | config.polynomial = polynomial; |
Anna Bridge |
169:a7c7b631e539 | 240 | config.width = width; |
Anna Bridge |
169:a7c7b631e539 | 241 | config.initial_xor = _initial_value; |
Anna Bridge |
169:a7c7b631e539 | 242 | config.final_xor = _final_xor; |
Anna Bridge |
169:a7c7b631e539 | 243 | config.reflect_in = _reflect_data; |
Anna Bridge |
169:a7c7b631e539 | 244 | config.reflect_out = _reflect_remainder; |
Anna Bridge |
169:a7c7b631e539 | 245 | |
Anna Bridge |
169:a7c7b631e539 | 246 | hal_crc_compute_partial_start(&config); |
Anna Bridge |
169:a7c7b631e539 | 247 | } |
AnnaBridge | 171:3a7713b1edbc | 248 | #endif |
Anna Bridge |
169:a7c7b631e539 | 249 | |
AnnaBridge | 165:d1b4690b3f8b | 250 | *crc = _initial_value; |
AnnaBridge | 165:d1b4690b3f8b | 251 | return 0; |
AnnaBridge | 165:d1b4690b3f8b | 252 | } |
AnnaBridge | 165:d1b4690b3f8b | 253 | |
AnnaBridge | 165:d1b4690b3f8b | 254 | /** Get the final CRC value of partial computation. |
AnnaBridge | 165:d1b4690b3f8b | 255 | * |
AnnaBridge | 165:d1b4690b3f8b | 256 | * CRC value available in partial computation is not correct CRC, as some |
AnnaBridge | 165:d1b4690b3f8b | 257 | * algorithms require remainder to be reflected and final value to be XORed |
AnnaBridge | 165:d1b4690b3f8b | 258 | * This API is used to perform final computation to get correct CRC value. |
AnnaBridge | 165:d1b4690b3f8b | 259 | * |
AnnaBridge | 165:d1b4690b3f8b | 260 | * @param crc CRC result |
AnnaBridge | 171:3a7713b1edbc | 261 | * @return 0 on success or a negative in case of failure. |
AnnaBridge | 165:d1b4690b3f8b | 262 | */ |
AnnaBridge | 165:d1b4690b3f8b | 263 | int32_t compute_partial_stop(uint32_t *crc) |
AnnaBridge | 165:d1b4690b3f8b | 264 | { |
AnnaBridge | 165:d1b4690b3f8b | 265 | MBED_ASSERT(crc != NULL); |
Anna Bridge |
169:a7c7b631e539 | 266 | |
AnnaBridge | 172:65be27845400 | 267 | #if DEVICE_CRC |
Anna Bridge |
169:a7c7b631e539 | 268 | if (_mode == HARDWARE) { |
Anna Bridge |
169:a7c7b631e539 | 269 | *crc = hal_crc_get_result(); |
AnnaBridge | 171:3a7713b1edbc | 270 | unlock(); |
Anna Bridge |
169:a7c7b631e539 | 271 | return 0; |
AnnaBridge | 171:3a7713b1edbc | 272 | } |
Anna Bridge |
169:a7c7b631e539 | 273 | #endif |
AnnaBridge | 165:d1b4690b3f8b | 274 | uint32_t p_crc = *crc; |
AnnaBridge | 165:d1b4690b3f8b | 275 | if ((width < 8) && (NULL == _crc_table)) { |
AnnaBridge | 165:d1b4690b3f8b | 276 | p_crc = (uint32_t)(p_crc << (8 - width)); |
AnnaBridge | 165:d1b4690b3f8b | 277 | } |
AnnaBridge | 171:3a7713b1edbc | 278 | // Optimized algorithm for 32BitANSI does not need additional reflect_remainder |
AnnaBridge | 171:3a7713b1edbc | 279 | if ((TABLE == _mode) && (POLY_32BIT_REV_ANSI == polynomial)) { |
AnnaBridge | 171:3a7713b1edbc | 280 | *crc = (p_crc ^ _final_xor) & get_crc_mask(); |
AnnaBridge | 171:3a7713b1edbc | 281 | } else { |
AnnaBridge | 171:3a7713b1edbc | 282 | *crc = (reflect_remainder(p_crc) ^ _final_xor) & get_crc_mask(); |
AnnaBridge | 171:3a7713b1edbc | 283 | } |
AnnaBridge | 171:3a7713b1edbc | 284 | unlock(); |
AnnaBridge | 165:d1b4690b3f8b | 285 | return 0; |
AnnaBridge | 165:d1b4690b3f8b | 286 | } |
AnnaBridge | 165:d1b4690b3f8b | 287 | |
AnnaBridge | 171:3a7713b1edbc | 288 | /** Get the current CRC polynomial. |
AnnaBridge | 165:d1b4690b3f8b | 289 | * |
AnnaBridge | 165:d1b4690b3f8b | 290 | * @return Polynomial value |
AnnaBridge | 165:d1b4690b3f8b | 291 | */ |
AnnaBridge | 165:d1b4690b3f8b | 292 | uint32_t get_polynomial(void) const |
AnnaBridge | 165:d1b4690b3f8b | 293 | { |
AnnaBridge | 165:d1b4690b3f8b | 294 | return polynomial; |
AnnaBridge | 165:d1b4690b3f8b | 295 | } |
AnnaBridge | 165:d1b4690b3f8b | 296 | |
AnnaBridge | 165:d1b4690b3f8b | 297 | /** Get the current CRC width |
AnnaBridge | 165:d1b4690b3f8b | 298 | * |
AnnaBridge | 165:d1b4690b3f8b | 299 | * @return CRC width |
AnnaBridge | 165:d1b4690b3f8b | 300 | */ |
AnnaBridge | 165:d1b4690b3f8b | 301 | uint8_t get_width(void) const |
AnnaBridge | 165:d1b4690b3f8b | 302 | { |
AnnaBridge | 165:d1b4690b3f8b | 303 | return width; |
AnnaBridge | 165:d1b4690b3f8b | 304 | } |
AnnaBridge | 165:d1b4690b3f8b | 305 | |
AnnaBridge | 172:65be27845400 | 306 | #if !defined(DOXYGEN_ONLY) |
AnnaBridge | 165:d1b4690b3f8b | 307 | private: |
AnnaBridge | 165:d1b4690b3f8b | 308 | uint32_t _initial_value; |
AnnaBridge | 165:d1b4690b3f8b | 309 | uint32_t _final_xor; |
AnnaBridge | 165:d1b4690b3f8b | 310 | bool _reflect_data; |
AnnaBridge | 165:d1b4690b3f8b | 311 | bool _reflect_remainder; |
AnnaBridge | 165:d1b4690b3f8b | 312 | uint32_t *_crc_table; |
Anna Bridge |
169:a7c7b631e539 | 313 | CrcMode _mode; |
AnnaBridge | 165:d1b4690b3f8b | 314 | |
AnnaBridge | 171:3a7713b1edbc | 315 | /** Acquire exclusive access to CRC hardware/software. |
AnnaBridge | 171:3a7713b1edbc | 316 | */ |
AnnaBridge | 172:65be27845400 | 317 | void lock() |
AnnaBridge | 171:3a7713b1edbc | 318 | { |
AnnaBridge | 172:65be27845400 | 319 | #if DEVICE_CRC |
AnnaBridge | 171:3a7713b1edbc | 320 | if (_mode == HARDWARE) { |
AnnaBridge | 171:3a7713b1edbc | 321 | mbed_crc_mutex->lock(); |
AnnaBridge | 171:3a7713b1edbc | 322 | } |
AnnaBridge | 171:3a7713b1edbc | 323 | #endif |
AnnaBridge | 171:3a7713b1edbc | 324 | } |
AnnaBridge | 171:3a7713b1edbc | 325 | |
AnnaBridge | 171:3a7713b1edbc | 326 | /** Release exclusive access to CRC hardware/software. |
AnnaBridge | 171:3a7713b1edbc | 327 | */ |
AnnaBridge | 171:3a7713b1edbc | 328 | virtual void unlock() |
AnnaBridge | 171:3a7713b1edbc | 329 | { |
AnnaBridge | 172:65be27845400 | 330 | #if DEVICE_CRC |
AnnaBridge | 171:3a7713b1edbc | 331 | if (_mode == HARDWARE) { |
AnnaBridge | 171:3a7713b1edbc | 332 | mbed_crc_mutex->unlock(); |
AnnaBridge | 171:3a7713b1edbc | 333 | } |
AnnaBridge | 171:3a7713b1edbc | 334 | #endif |
AnnaBridge | 171:3a7713b1edbc | 335 | } |
AnnaBridge | 171:3a7713b1edbc | 336 | |
AnnaBridge | 171:3a7713b1edbc | 337 | /** Get the current CRC data size. |
AnnaBridge | 165:d1b4690b3f8b | 338 | * |
AnnaBridge | 165:d1b4690b3f8b | 339 | * @return CRC data size in bytes |
AnnaBridge | 165:d1b4690b3f8b | 340 | */ |
AnnaBridge | 165:d1b4690b3f8b | 341 | uint8_t get_data_size(void) const |
AnnaBridge | 165:d1b4690b3f8b | 342 | { |
AnnaBridge | 165:d1b4690b3f8b | 343 | return (width <= 8 ? 1 : (width <= 16 ? 2 : 4)); |
AnnaBridge | 165:d1b4690b3f8b | 344 | } |
AnnaBridge | 165:d1b4690b3f8b | 345 | |
AnnaBridge | 171:3a7713b1edbc | 346 | /** Get the top bit of current CRC. |
AnnaBridge | 165:d1b4690b3f8b | 347 | * |
AnnaBridge | 165:d1b4690b3f8b | 348 | * @return Top bit is set high for respective data width of current CRC |
AnnaBridge | 165:d1b4690b3f8b | 349 | * Top bit for CRC width less then 8 bits will be set as 8th bit. |
AnnaBridge | 165:d1b4690b3f8b | 350 | */ |
AnnaBridge | 165:d1b4690b3f8b | 351 | uint32_t get_top_bit(void) const |
AnnaBridge | 165:d1b4690b3f8b | 352 | { |
AnnaBridge | 165:d1b4690b3f8b | 353 | return (width < 8 ? (1u << 7) : (uint32_t)(1ul << (width - 1))); |
AnnaBridge | 165:d1b4690b3f8b | 354 | } |
AnnaBridge | 165:d1b4690b3f8b | 355 | |
AnnaBridge | 171:3a7713b1edbc | 356 | /** Get the CRC data mask. |
AnnaBridge | 165:d1b4690b3f8b | 357 | * |
AnnaBridge | 165:d1b4690b3f8b | 358 | * @return CRC data mask is generated based on current CRC width |
AnnaBridge | 165:d1b4690b3f8b | 359 | */ |
AnnaBridge | 165:d1b4690b3f8b | 360 | uint32_t get_crc_mask(void) const |
AnnaBridge | 165:d1b4690b3f8b | 361 | { |
AnnaBridge | 165:d1b4690b3f8b | 362 | return (width < 8 ? ((1u << 8) - 1) : (uint32_t)((uint64_t)(1ull << width) - 1)); |
AnnaBridge | 165:d1b4690b3f8b | 363 | } |
AnnaBridge | 165:d1b4690b3f8b | 364 | |
AnnaBridge | 171:3a7713b1edbc | 365 | /** Final value of CRC is reflected. |
AnnaBridge | 165:d1b4690b3f8b | 366 | * |
AnnaBridge | 165:d1b4690b3f8b | 367 | * @param data final crc value, which should be reflected |
AnnaBridge | 165:d1b4690b3f8b | 368 | * @return Reflected CRC value |
AnnaBridge | 165:d1b4690b3f8b | 369 | */ |
AnnaBridge | 165:d1b4690b3f8b | 370 | uint32_t reflect_remainder(uint32_t data) const |
AnnaBridge | 165:d1b4690b3f8b | 371 | { |
AnnaBridge | 165:d1b4690b3f8b | 372 | if (_reflect_remainder) { |
AnnaBridge | 165:d1b4690b3f8b | 373 | uint32_t reflection = 0x0; |
AnnaBridge | 165:d1b4690b3f8b | 374 | uint8_t const nBits = (width < 8 ? 8 : width); |
AnnaBridge | 165:d1b4690b3f8b | 375 | |
AnnaBridge | 165:d1b4690b3f8b | 376 | for (uint8_t bit = 0; bit < nBits; ++bit) { |
AnnaBridge | 165:d1b4690b3f8b | 377 | if (data & 0x01) { |
AnnaBridge | 165:d1b4690b3f8b | 378 | reflection |= (1 << ((nBits - 1) - bit)); |
AnnaBridge | 165:d1b4690b3f8b | 379 | } |
AnnaBridge | 165:d1b4690b3f8b | 380 | data = (data >> 1); |
AnnaBridge | 165:d1b4690b3f8b | 381 | } |
AnnaBridge | 165:d1b4690b3f8b | 382 | return (reflection); |
AnnaBridge | 165:d1b4690b3f8b | 383 | } else { |
AnnaBridge | 165:d1b4690b3f8b | 384 | return data; |
AnnaBridge | 165:d1b4690b3f8b | 385 | } |
AnnaBridge | 165:d1b4690b3f8b | 386 | } |
AnnaBridge | 165:d1b4690b3f8b | 387 | |
AnnaBridge | 171:3a7713b1edbc | 388 | /** Data bytes are reflected. |
AnnaBridge | 165:d1b4690b3f8b | 389 | * |
AnnaBridge | 165:d1b4690b3f8b | 390 | * @param data value to be reflected |
AnnaBridge | 165:d1b4690b3f8b | 391 | * @return Reflected data value |
AnnaBridge | 165:d1b4690b3f8b | 392 | */ |
AnnaBridge | 165:d1b4690b3f8b | 393 | uint32_t reflect_bytes(uint32_t data) const |
AnnaBridge | 165:d1b4690b3f8b | 394 | { |
AnnaBridge | 170:e95d10626187 | 395 | if (_reflect_data) { |
AnnaBridge | 165:d1b4690b3f8b | 396 | uint32_t reflection = 0x0; |
AnnaBridge | 165:d1b4690b3f8b | 397 | |
AnnaBridge | 165:d1b4690b3f8b | 398 | for (uint8_t bit = 0; bit < 8; ++bit) { |
AnnaBridge | 165:d1b4690b3f8b | 399 | if (data & 0x01) { |
AnnaBridge | 165:d1b4690b3f8b | 400 | reflection |= (1 << (7 - bit)); |
AnnaBridge | 165:d1b4690b3f8b | 401 | } |
AnnaBridge | 165:d1b4690b3f8b | 402 | data = (data >> 1); |
AnnaBridge | 165:d1b4690b3f8b | 403 | } |
AnnaBridge | 165:d1b4690b3f8b | 404 | return (reflection); |
AnnaBridge | 165:d1b4690b3f8b | 405 | } else { |
AnnaBridge | 165:d1b4690b3f8b | 406 | return data; |
AnnaBridge | 165:d1b4690b3f8b | 407 | } |
AnnaBridge | 165:d1b4690b3f8b | 408 | } |
AnnaBridge | 165:d1b4690b3f8b | 409 | |
AnnaBridge | 171:3a7713b1edbc | 410 | /** Bitwise CRC computation. |
AnnaBridge | 165:d1b4690b3f8b | 411 | * |
AnnaBridge | 165:d1b4690b3f8b | 412 | * @param buffer data buffer |
AnnaBridge | 165:d1b4690b3f8b | 413 | * @param size size of the data |
AnnaBridge | 165:d1b4690b3f8b | 414 | * @param crc CRC value is filled in, but the value is not the final |
AnnaBridge | 165:d1b4690b3f8b | 415 | * @return 0 on success or a negative error code on failure |
AnnaBridge | 165:d1b4690b3f8b | 416 | */ |
AnnaBridge | 165:d1b4690b3f8b | 417 | int32_t bitwise_compute_partial(const void *buffer, crc_data_size_t size, uint32_t *crc) const |
AnnaBridge | 165:d1b4690b3f8b | 418 | { |
AnnaBridge | 165:d1b4690b3f8b | 419 | MBED_ASSERT(crc != NULL); |
AnnaBridge | 165:d1b4690b3f8b | 420 | |
AnnaBridge | 165:d1b4690b3f8b | 421 | const uint8_t *data = static_cast<const uint8_t *>(buffer); |
AnnaBridge | 165:d1b4690b3f8b | 422 | uint32_t p_crc = *crc; |
AnnaBridge | 165:d1b4690b3f8b | 423 | |
AnnaBridge | 165:d1b4690b3f8b | 424 | if (width < 8) { |
AnnaBridge | 165:d1b4690b3f8b | 425 | uint8_t data_byte; |
AnnaBridge | 165:d1b4690b3f8b | 426 | for (crc_data_size_t byte = 0; byte < size; byte++) { |
AnnaBridge | 165:d1b4690b3f8b | 427 | data_byte = reflect_bytes(data[byte]); |
AnnaBridge | 165:d1b4690b3f8b | 428 | for (uint8_t bit = 8; bit > 0; --bit) { |
AnnaBridge | 165:d1b4690b3f8b | 429 | p_crc <<= 1; |
AnnaBridge | 170:e95d10626187 | 430 | if ((data_byte ^ p_crc) & get_top_bit()) { |
AnnaBridge | 165:d1b4690b3f8b | 431 | p_crc ^= polynomial; |
AnnaBridge | 165:d1b4690b3f8b | 432 | } |
AnnaBridge | 165:d1b4690b3f8b | 433 | data_byte <<= 1; |
AnnaBridge | 165:d1b4690b3f8b | 434 | } |
AnnaBridge | 165:d1b4690b3f8b | 435 | } |
AnnaBridge | 165:d1b4690b3f8b | 436 | } else { |
AnnaBridge | 165:d1b4690b3f8b | 437 | for (crc_data_size_t byte = 0; byte < size; byte++) { |
AnnaBridge | 165:d1b4690b3f8b | 438 | p_crc ^= (reflect_bytes(data[byte]) << (width - 8)); |
AnnaBridge | 165:d1b4690b3f8b | 439 | |
AnnaBridge | 165:d1b4690b3f8b | 440 | // Perform modulo-2 division, a bit at a time |
AnnaBridge | 165:d1b4690b3f8b | 441 | for (uint8_t bit = 8; bit > 0; --bit) { |
AnnaBridge | 165:d1b4690b3f8b | 442 | if (p_crc & get_top_bit()) { |
AnnaBridge | 165:d1b4690b3f8b | 443 | p_crc = (p_crc << 1) ^ polynomial; |
AnnaBridge | 165:d1b4690b3f8b | 444 | } else { |
AnnaBridge | 165:d1b4690b3f8b | 445 | p_crc = (p_crc << 1); |
AnnaBridge | 165:d1b4690b3f8b | 446 | } |
AnnaBridge | 165:d1b4690b3f8b | 447 | } |
AnnaBridge | 165:d1b4690b3f8b | 448 | } |
AnnaBridge | 165:d1b4690b3f8b | 449 | } |
AnnaBridge | 165:d1b4690b3f8b | 450 | *crc = p_crc & get_crc_mask(); |
AnnaBridge | 165:d1b4690b3f8b | 451 | return 0; |
AnnaBridge | 165:d1b4690b3f8b | 452 | } |
AnnaBridge | 165:d1b4690b3f8b | 453 | |
AnnaBridge | 171:3a7713b1edbc | 454 | /** CRC computation using ROM tables. |
AnnaBridge | 170:e95d10626187 | 455 | * |
AnnaBridge | 170:e95d10626187 | 456 | * @param buffer data buffer |
AnnaBridge | 170:e95d10626187 | 457 | * @param size size of the data |
AnnaBridge | 170:e95d10626187 | 458 | * @param crc CRC value is filled in, but the value is not the final |
AnnaBridge | 170:e95d10626187 | 459 | * @return 0 on success or a negative error code on failure |
AnnaBridge | 170:e95d10626187 | 460 | */ |
AnnaBridge | 165:d1b4690b3f8b | 461 | int32_t table_compute_partial(const void *buffer, crc_data_size_t size, uint32_t *crc) const |
AnnaBridge | 165:d1b4690b3f8b | 462 | { |
AnnaBridge | 165:d1b4690b3f8b | 463 | MBED_ASSERT(crc != NULL); |
AnnaBridge | 165:d1b4690b3f8b | 464 | |
AnnaBridge | 165:d1b4690b3f8b | 465 | const uint8_t *data = static_cast<const uint8_t *>(buffer); |
AnnaBridge | 165:d1b4690b3f8b | 466 | uint32_t p_crc = *crc; |
AnnaBridge | 165:d1b4690b3f8b | 467 | uint8_t data_byte = 0; |
AnnaBridge | 165:d1b4690b3f8b | 468 | |
AnnaBridge | 165:d1b4690b3f8b | 469 | if (width <= 8) { |
AnnaBridge | 165:d1b4690b3f8b | 470 | uint8_t *crc_table = (uint8_t *)_crc_table; |
AnnaBridge | 165:d1b4690b3f8b | 471 | for (crc_data_size_t byte = 0; byte < size; byte++) { |
AnnaBridge | 165:d1b4690b3f8b | 472 | data_byte = reflect_bytes(data[byte]) ^ p_crc; |
AnnaBridge | 165:d1b4690b3f8b | 473 | p_crc = crc_table[data_byte]; |
AnnaBridge | 165:d1b4690b3f8b | 474 | } |
AnnaBridge | 165:d1b4690b3f8b | 475 | } else if (width <= 16) { |
AnnaBridge | 165:d1b4690b3f8b | 476 | uint16_t *crc_table = (uint16_t *)_crc_table; |
AnnaBridge | 165:d1b4690b3f8b | 477 | for (crc_data_size_t byte = 0; byte < size; byte++) { |
AnnaBridge | 165:d1b4690b3f8b | 478 | data_byte = reflect_bytes(data[byte]) ^ (p_crc >> (width - 8)); |
AnnaBridge | 165:d1b4690b3f8b | 479 | p_crc = crc_table[data_byte] ^ (p_crc << 8); |
AnnaBridge | 165:d1b4690b3f8b | 480 | } |
AnnaBridge | 165:d1b4690b3f8b | 481 | } else { |
AnnaBridge | 165:d1b4690b3f8b | 482 | uint32_t *crc_table = (uint32_t *)_crc_table; |
AnnaBridge | 171:3a7713b1edbc | 483 | if (POLY_32BIT_REV_ANSI == polynomial) { |
AnnaBridge | 171:3a7713b1edbc | 484 | for (crc_data_size_t i = 0; i < size; i++) { |
AnnaBridge | 171:3a7713b1edbc | 485 | p_crc = (p_crc >> 4) ^ crc_table[(p_crc ^ (data[i] >> 0)) & 0xf]; |
AnnaBridge | 171:3a7713b1edbc | 486 | p_crc = (p_crc >> 4) ^ crc_table[(p_crc ^ (data[i] >> 4)) & 0xf]; |
AnnaBridge | 171:3a7713b1edbc | 487 | } |
AnnaBridge | 172:65be27845400 | 488 | } else { |
AnnaBridge | 171:3a7713b1edbc | 489 | for (crc_data_size_t byte = 0; byte < size; byte++) { |
AnnaBridge | 171:3a7713b1edbc | 490 | data_byte = reflect_bytes(data[byte]) ^ (p_crc >> (width - 8)); |
AnnaBridge | 171:3a7713b1edbc | 491 | p_crc = crc_table[data_byte] ^ (p_crc << 8); |
AnnaBridge | 171:3a7713b1edbc | 492 | } |
AnnaBridge | 165:d1b4690b3f8b | 493 | } |
AnnaBridge | 165:d1b4690b3f8b | 494 | } |
AnnaBridge | 165:d1b4690b3f8b | 495 | *crc = p_crc & get_crc_mask(); |
AnnaBridge | 165:d1b4690b3f8b | 496 | return 0; |
AnnaBridge | 165:d1b4690b3f8b | 497 | } |
AnnaBridge | 165:d1b4690b3f8b | 498 | |
AnnaBridge | 171:3a7713b1edbc | 499 | /** Constructor init called from all specialized cases of constructor. |
AnnaBridge | 172:65be27845400 | 500 | * Note: All constructor common code should be in this function. |
AnnaBridge | 165:d1b4690b3f8b | 501 | */ |
Anna Bridge |
169:a7c7b631e539 | 502 | void mbed_crc_ctor(void) |
AnnaBridge | 165:d1b4690b3f8b | 503 | { |
AnnaBridge | 165:d1b4690b3f8b | 504 | MBED_STATIC_ASSERT(width <= 32, "Max 32-bit CRC supported"); |
Anna Bridge |
169:a7c7b631e539 | 505 | |
AnnaBridge | 172:65be27845400 | 506 | #if DEVICE_CRC |
AnnaBridge | 171:3a7713b1edbc | 507 | if (POLY_32BIT_REV_ANSI == polynomial) { |
AnnaBridge | 171:3a7713b1edbc | 508 | _crc_table = (uint32_t *)Table_CRC_32bit_Rev_ANSI; |
AnnaBridge | 171:3a7713b1edbc | 509 | _mode = TABLE; |
AnnaBridge | 171:3a7713b1edbc | 510 | return; |
AnnaBridge | 171:3a7713b1edbc | 511 | } |
Anna Bridge |
169:a7c7b631e539 | 512 | crc_mbed_config_t config; |
Anna Bridge |
169:a7c7b631e539 | 513 | config.polynomial = polynomial; |
Anna Bridge |
169:a7c7b631e539 | 514 | config.width = width; |
Anna Bridge |
169:a7c7b631e539 | 515 | config.initial_xor = _initial_value; |
Anna Bridge |
169:a7c7b631e539 | 516 | config.final_xor = _final_xor; |
Anna Bridge |
169:a7c7b631e539 | 517 | config.reflect_in = _reflect_data; |
Anna Bridge |
169:a7c7b631e539 | 518 | config.reflect_out = _reflect_remainder; |
Anna Bridge |
169:a7c7b631e539 | 519 | |
Anna Bridge |
169:a7c7b631e539 | 520 | if (hal_crc_is_supported(&config)) { |
Anna Bridge |
169:a7c7b631e539 | 521 | _mode = HARDWARE; |
AnnaBridge | 171:3a7713b1edbc | 522 | return; |
Anna Bridge |
169:a7c7b631e539 | 523 | } |
Anna Bridge |
169:a7c7b631e539 | 524 | #endif |
AnnaBridge | 171:3a7713b1edbc | 525 | |
AnnaBridge | 171:3a7713b1edbc | 526 | switch (polynomial) { |
AnnaBridge | 171:3a7713b1edbc | 527 | case POLY_32BIT_ANSI: |
AnnaBridge | 171:3a7713b1edbc | 528 | _crc_table = (uint32_t *)Table_CRC_32bit_ANSI; |
AnnaBridge | 171:3a7713b1edbc | 529 | break; |
AnnaBridge | 171:3a7713b1edbc | 530 | case POLY_32BIT_REV_ANSI: |
AnnaBridge | 171:3a7713b1edbc | 531 | _crc_table = (uint32_t *)Table_CRC_32bit_Rev_ANSI; |
AnnaBridge | 171:3a7713b1edbc | 532 | break; |
AnnaBridge | 171:3a7713b1edbc | 533 | case POLY_8BIT_CCITT: |
AnnaBridge | 171:3a7713b1edbc | 534 | _crc_table = (uint32_t *)Table_CRC_8bit_CCITT; |
AnnaBridge | 171:3a7713b1edbc | 535 | break; |
AnnaBridge | 171:3a7713b1edbc | 536 | case POLY_7BIT_SD: |
AnnaBridge | 171:3a7713b1edbc | 537 | _crc_table = (uint32_t *)Table_CRC_7Bit_SD; |
AnnaBridge | 171:3a7713b1edbc | 538 | break; |
AnnaBridge | 171:3a7713b1edbc | 539 | case POLY_16BIT_CCITT: |
AnnaBridge | 171:3a7713b1edbc | 540 | _crc_table = (uint32_t *)Table_CRC_16bit_CCITT; |
AnnaBridge | 171:3a7713b1edbc | 541 | break; |
AnnaBridge | 171:3a7713b1edbc | 542 | case POLY_16BIT_IBM: |
AnnaBridge | 171:3a7713b1edbc | 543 | _crc_table = (uint32_t *)Table_CRC_16bit_IBM; |
AnnaBridge | 171:3a7713b1edbc | 544 | break; |
AnnaBridge | 171:3a7713b1edbc | 545 | default: |
AnnaBridge | 171:3a7713b1edbc | 546 | _crc_table = NULL; |
AnnaBridge | 171:3a7713b1edbc | 547 | break; |
AnnaBridge | 171:3a7713b1edbc | 548 | } |
AnnaBridge | 171:3a7713b1edbc | 549 | _mode = (_crc_table != NULL) ? TABLE : BITWISE; |
AnnaBridge | 165:d1b4690b3f8b | 550 | } |
AnnaBridge | 172:65be27845400 | 551 | #endif |
AnnaBridge | 165:d1b4690b3f8b | 552 | }; |
AnnaBridge | 165:d1b4690b3f8b | 553 | |
AnnaBridge | 165:d1b4690b3f8b | 554 | #if defined ( __CC_ARM ) |
AnnaBridge | 165:d1b4690b3f8b | 555 | #elif defined ( __GNUC__ ) |
AnnaBridge | 165:d1b4690b3f8b | 556 | #pragma GCC diagnostic pop |
AnnaBridge | 170:e95d10626187 | 557 | #elif defined (__ICCARM__) |
AnnaBridge | 165:d1b4690b3f8b | 558 | #endif |
AnnaBridge | 165:d1b4690b3f8b | 559 | |
AnnaBridge | 165:d1b4690b3f8b | 560 | /** @}*/ |
AnnaBridge | 165:d1b4690b3f8b | 561 | } // namespace mbed |
AnnaBridge | 165:d1b4690b3f8b | 562 | |
AnnaBridge | 165:d1b4690b3f8b | 563 | #endif |