339 lines
12 KiB
C
339 lines
12 KiB
C
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/*
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ChibiOS - Copyright (C) 2015 Michael D. Spradling
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file crcsw.c
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* @brief CRC software driver.
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@note SW implementation was based from:
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* @note http://www.barrgroup.com/Embedded-Systems/How-To/CRC-Calculation-C-Code
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*
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* @addtogroup CRC
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_CRC || defined(__DOXYGEN__)
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#if CRCSW_USE_CRC1 || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/**
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* @brief CRC default configuration.
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*/
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#if CRCSW_CRC32_TABLE == TRUE || defined(__DOXYGEN__)
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static const uint32_t crc32_table[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
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0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
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0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
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0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
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0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
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0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
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0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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#endif
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#if CRCSW_CRC16_TABLE || defined(__DOXYGEN__)
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static const uint32_t crc16_table[256] = {
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0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
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0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
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0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
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0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
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0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
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0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
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0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
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0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
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0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
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0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
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0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
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0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
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0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
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0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
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0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
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0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
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0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
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0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
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0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
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0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
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0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
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0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
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0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
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0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
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0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
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0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
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0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
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0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
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0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
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0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
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0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
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0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
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};
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#endif
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief CRC1 driver identifier.*/
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#if CRCSW_USE_CRC1 || defined(__DOXYGEN__)
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CRCDriver CRCD1;
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#endif
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#if CRCSW_CRC32_TABLE || defined(__DOXYGEN__)
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const CRCConfig crcsw_crc32_config = {
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.poly_size = 32,
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.poly = 0x04C11DB7,
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.initial_val = 0xFFFFFFFF,
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.final_val = 0xFFFFFFFF,
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.reflect_data = 1,
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.reflect_remainder = 1,
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.table = crc32_table
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};
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#endif
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#if CRCSW_CRC16_TABLE || defined(__DOXYGEN__)
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const CRCConfig crcsw_crc16_config = {
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.poly_size = 16,
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.poly = 0x8005,
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.initial_val = 0x0,
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.final_val = 0x0,
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.reflect_data = 1,
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.reflect_remainder = 1,
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.table = crc16_table
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};
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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#if (CRCSW_PROGRAMMABLE == TRUE)
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static uint32_t reflect(uint32_t data, uint8_t nBits) {
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uint32_t reflection = 0x00000000;
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uint8_t bit;
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/* Reflect the data about the center bit. */
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for (bit = 0; bit < nBits; ++bit) {
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/* If the LSB bit is set, set the reflection of it. */
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if (data & 0x01) {
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reflection |= (1 << ((nBits - 1) - bit));
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}
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data = (data >> 1);
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}
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return reflection;
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}
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#endif
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level CRC software initialization.
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*
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* @notapi
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*/
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void crc_lld_init(void) {
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crcObjectInit(&CRCD1);
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CRCD1.crc = CRCD1.config->initial_val;
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}
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/**
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* @brief Configures and activates the CRC peripheral.
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*
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* @param[in] crcp pointer to the @p CRCDriver object
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*
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* @notapi
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*/
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void crc_lld_start(CRCDriver *crcp) {
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osalDbgAssert(crcp->config != NULL, "config must not be NULL");
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#if CRCSW_PROGRAMMABLE == FALSE
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#if CRCSW_CRC32_TABLE == TRUE && CRCSW_CRC16_TABLE == TRUE
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osalDbgAssert((crcp->config == CRCSW_CRC32_TABLE_CONFIG) ||
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(crcp->config == CRCSW_CRC16_TABLE_CONFIG), "config must be CRCSW_CRC32_TABLE_CONFIG or CRCSW_CRC16_TABLE_CONFIG");
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#elif CRCSW_CRC32_TABLE == TRUE && CRCSW_CRC16_TABLE == FALSE
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osalDbgAssert(crcp->config == CRCSW_CRC32_TABLE_CONFIG,
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"config must be CRCSW_CRC32_TABLE_CONFIG");
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#else
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osalDbgAssert(crcp->config == CRCSW_CRC16_TABLE_CONFIG,
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"config must be CRCSW_CRC16_TABLE_CONFIG");
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#endif
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#endif
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crc_lld_reset(crcp);
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}
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/**
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* @brief Deactivates the CRC peripheral.
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*
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* @param[in] crcp pointer to the @p CRCDriver object
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*
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* @notapi
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*/
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void crc_lld_stop(CRCDriver *crcp) {
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(void)crcp;
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}
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/**
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* @brief Resets current CRC calculation.
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*
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* @param[in] crcp pointer to the @p CRCDriver object
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
void crc_lld_reset(CRCDriver *crcp) {
|
||
|
|
crcp->crc = crcp->config->initial_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns calculated CRC from last reset
|
||
|
|
*
|
||
|
|
* @param[in] crcp pointer to the @p CRCDriver object
|
||
|
|
* @param[in] n size of buf in bytes
|
||
|
|
* @param[in] buf @p buffer location
|
||
|
|
*
|
||
|
|
* @notapi
|
||
|
|
*/
|
||
|
|
uint32_t crc_lld_calc(CRCDriver *crcp, size_t n, const void *buf) {
|
||
|
|
uint32_t i;
|
||
|
|
uint32_t crc;
|
||
|
|
#if (CRCSW_CRC32_TABLE == TRUE) || (CRCSW_CRC16_TABLE == TRUE)
|
||
|
|
if (crcp->config->table != NULL) {
|
||
|
|
for (i = 0; i < n; i++) {
|
||
|
|
uint8_t data = *((uint8_t*)buf + i);
|
||
|
|
uint8_t idx = (crcp->crc ^ data);
|
||
|
|
crcp->crc = (crcp->config->table[idx] ^ (crcp->crc >> 8));
|
||
|
|
}
|
||
|
|
crc = crcp->crc;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if (CRCSW_PROGRAMMABLE == TRUE)
|
||
|
|
// Mask off bits to poly size
|
||
|
|
uint32_t mask = 1 << (crcp->config->poly_size - 1);
|
||
|
|
mask |= (mask - 1);
|
||
|
|
|
||
|
|
crc = crcp->crc;
|
||
|
|
if (crcp->config->table == NULL) {
|
||
|
|
for (i = 0; i < n; i++) {
|
||
|
|
uint8_t data = *((uint8_t*)buf + i);
|
||
|
|
uint8_t bit;
|
||
|
|
|
||
|
|
if (crcp->config->reflect_data) {
|
||
|
|
data = reflect(data, 8);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Bring the next byte into the remainder. */
|
||
|
|
crc ^= (data << (crcp->config->poly_size - 8));
|
||
|
|
|
||
|
|
/* Perform modulo-2 division, a bit at a time. */
|
||
|
|
for (bit = 8; bit > 0; --bit) {
|
||
|
|
/* Try to divide the current data bit. */
|
||
|
|
if (crc & (1 << (crcp->config->poly_size - 1))) {
|
||
|
|
crc = (crc << 1) ^ crcp->config->poly;
|
||
|
|
} else {
|
||
|
|
crc <<= 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
crcp->crc = crc;
|
||
|
|
|
||
|
|
if (crcp->config->reflect_remainder) {
|
||
|
|
crc = reflect(crc, crcp->config->poly_size);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return (crc ^ crcp->config->final_val) & mask;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* CRCSW_USE_CRC1 */
|
||
|
|
|
||
|
|
#endif /* HAL_USE_CRC */
|