【Tool】CRC8 校验计算 X8 + X2 + X + 1
【摘要】
多项式:
CRC工具与源码
X8 + X2 + X + 1
原理参考:CRC8 原理解析
1、计算法实现校验
uint8 CRC8( uint8* pBuffer, uint16 bufSize ){ uint8 crc = 0; // 数据合法 if ( buf...
多项式:
X8 + X2 + X + 1
原理参考:CRC8 原理解析
1、计算法实现校验
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uint8 CRC8( uint8* pBuffer, uint16 bufSize )
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{
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uint8 crc = 0;
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// 数据合法
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if ( bufSize <= 0 )
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{
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return crc;
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}
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while( bufSize-- != 0 )
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{
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for ( uint16 i = 0x80; i != 0; i /= 2 )
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{
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if ( (crc & 0x80) != 0)
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{
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crc *= 2;
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crc ^= 0x07; // 多项式:X8 + X2 + X + 1
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}
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else
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{
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crc *= 2;
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}
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if ( (*pBuffer & i) != 0 )
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{
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crc ^= 0x07;
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}
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}
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pBuffer++;
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}
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return crc;
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}
2、查表法实现校验
数据表:
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static const uint8 crc8_table[256] =
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{
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0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
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0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
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0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
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0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
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0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
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0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
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0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
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0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
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0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
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0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
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0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
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0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
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0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
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0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
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0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
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0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
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};
实现:
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// 数据中包含 1 字节校验
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static uint8 crc8_check(uint8* data, uint16 len )
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{
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uint16 i = 0;
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uint8 fcs = 0x0;
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// 计算数据校验
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for (i = 0; i < (len - 1); i++)
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{
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fcs = crc8_table[(uint8)fcs ^ *data];
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data++;
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}
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// 计算的 CRC 校验与数据最后一个字节对比
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if(fcs == (*data))
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{
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return 0;
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}
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return -1;
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}
文章来源: blog.csdn.net,作者:简一商业,版权归原作者所有,如需转载,请联系作者。
原文链接:blog.csdn.net/liwei16611/article/details/86704451
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