我需要精确计算CRC-8-Dallas/Maxim。有人能提供一个算法吗?任何帮助是赞赏!
CRC-8-Dallas/Maxim
c2e8gylq1#
CRC-8-达拉斯/Maxim变体1(C样式):
unsigned char dallas_crc8(const unsigned char * data, const unsigned int size) { unsigned char crc = 0; for ( unsigned int i = 0; i < size; ++i ) { unsigned char inbyte = data[i]; for ( unsigned char j = 0; j < 8; ++j ) { unsigned char mix = (crc ^ inbyte) & 0x01; crc >>= 1; if ( mix ) crc ^= 0x8C; inbyte >>= 1; } } return crc; }
CRC-8-达拉斯/Maxim变体2(C样式):
unsigned char crc_bits(unsigned char data) { unsigned char crc = 0; if(data & 1) crc ^= 0x5e; if(data & 2) crc ^= 0xbc; if(data & 4) crc ^= 0x61; if(data & 8) crc ^= 0xc2; if(data & 0x10) crc ^= 0x9d; if(data & 0x20) crc ^= 0x23; if(data & 0x40) crc ^= 0x46; if(data & 0x80) crc ^= 0x8c; return crc; } unsigned char dallas_crc8(const unsigned char * data, const unsigned int size) { unsigned char crc = 0; for ( unsigned int i = 0; i < size; ++i ) { crc = crc_bits(data[i] ^ crc); } return crc; }
CRC-8-达拉斯/Maxim变体3(C样式):
unsigned char crc_array[256] = { 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41, 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e, 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc, 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0, 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62, 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d, 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff, 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5, 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07, 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58, 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a, 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6, 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24, 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b, 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9, 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f, 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd, 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92, 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50, 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c, 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee, 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1, 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73, 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49, 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b, 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4, 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16, 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a, 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8, 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7, 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35, }; unsigned char dallas_crc8(const unsigned char * data, const unsigned int size) { unsigned char crc = 0; for ( unsigned int i = 0; i < size; ++i ) { crc = crc_array[data[i] ^ crc]; } return crc; }
CRC-8-达拉斯/Maxim变体4(带boost的C++风格):
#include "boost/crc.hpp" uint8_t dallas_crc8(const uint8_t * data, const uint32_t size) { boost::crc_optimal <8, 0x31, 0, 0, true, true> crc; crc.process_bytes(data, size); return crc.checksum(); }
g6baxovj2#
#define CRC8INIT 0x00 #define CRC8POLY 0x31 // = X^8+X^5+X^4+X^0 uint8_t crc8(uint8_t *data, uint16_t size) { uint8_t crc, i; crc = CRC8INIT; while (size--) { crc ^= *data++; for (i = 0; i < 8; i++) { if (crc & 0x80) crc = (crc << 1) ^ CRC8POLY; else crc <<= 1; } } return crc; }
e0bqpujr3#
基于Stamen Rakov的答案,这里是Go风格的变体1函数:
func dallas_crc8(data []uint8) uint8 { var crc uint8 = 0; for _, inbyte := range data { for j := 0; j < 8; j++ { mix := (crc ^ inbyte) & 0x01 crc >>= 1; if mix > 0 { crc ^= 0x8C } inbyte >>= 1 } } return crc }
zc0qhyus4#
高速非循环版本:uint8_t crc_8(uint8_t crc,uint8_t data){ uint8_t X,Y;
X = Y = crc ^ data; Y <<= 3; X ^= Y; Y <<= 1; X ^= Y; Y <<= 2; X ^= Y; Y = X; X >>= 4; Y ^= X; X >>= 1; Y ^= X; return (uint8_t) Y;
}
4条答案
按热度按时间c2e8gylq1#
CRC-8-达拉斯/Maxim变体1(C样式):
CRC-8-达拉斯/Maxim变体2(C样式):
CRC-8-达拉斯/Maxim变体3(C样式):
CRC-8-达拉斯/Maxim变体4(带boost的C++风格):
g6baxovj2#
e0bqpujr3#
基于Stamen Rakov的答案,这里是Go风格的变体1函数:
zc0qhyus4#
高速非循环版本:
uint8_t crc_8(uint8_t crc,uint8_t data){ uint8_t X,Y;
}