/* */ #include "crc.h" //=====================================================CRC-16====================校验方式====================================================== // CRC_LIB库 https://github.com/lammertb/libcrc/tree/v2.0 /* USER CODE BEGIN 0 */ // CRC 低位字节值表 //获取CRC16校验值(CRC-CCITT (0xFFFF)) // puchMsg:要校验的数组 // usDataLen:校验的长度 //返回值:CRC16码 // CRC8校验 // ptr:要校验的数组 // len:数组长度 //返回值:CRC8码 uint8_t Get_Crc8(uint8_t *ptr, uint16_t len) { uint8_t crc; uint8_t i; crc = 0; while (len--) { crc ^= *ptr++; for (i = 0; i < 8; i++) { if (crc & 0x01) crc = (crc >> 1) ^ 0x8C; else crc >>= 1; } } return crc; } /* 天信盒子校验 */ unsigned char CRC8(const unsigned char *dest, unsigned short int len) { unsigned char crc = 0; unsigned char tempI; unsigned char sum; while (len--) { unsigned char extract = *dest++; for (tempI = 8; tempI; tempI--) { sum = (crc ^ extract) & 0x01; crc >>= 1; if (sum) { crc ^= 0x8c; } extract >>= 1; } } return crc; } //求和校验 所有字节之和为0 uint16_t Checksum_Sum(uint8_t *buf, uint16_t len) { uint8_t check = 0; while (len--) { check += *buf++; } check = 256 - check % 256; return (check)&0x00ff; } uint16_t ip_chksum(uint16_t initcksum, uint8_t *ptr, int len) { unsigned int cksum; int idx; int odd; cksum = (unsigned int) initcksum; odd = len & 1; len -= odd; for (idx = 0; idx < len; idx += 2) { cksum += ((unsigned long) ptr[idx] << 8) + ((unsigned long) ptr[idx+1]); } if (odd) { /* buffer is odd length */ cksum += ((unsigned long) ptr[idx] << 8); } /* * Fold in the carries */ while (cksum >> 16) { cksum = (cksum & 0xFFFF) + (cksum >> 16); } return cksum; } uint16_t tcp_chksum(uint16_t initcksum, uint8_t *tcphead, int tcplen , uint32_t *srcaddr, uint32_t *destaddr) { // uint8_t pseudoheader[12]; uint16_t calccksum = 0; // memcpy(&pseudoheader[0],srcaddr,IP_ADDR_LEN); // memcpy(&pseudoheader[4],destaddr,IP_ADDR_LEN); // pseudoheader[8] = 0; /* 填充零 */ // pseudoheader[9] = IPPROTO_TCP; // pseudoheader[10] = (tcplen >> 8) & 0xFF; // pseudoheader[11] = (tcplen & 0xFF); // calccksum = ip_chksum(0,pseudoheader,sizeof(pseudoheader)); calccksum = ip_chksum(calccksum,tcphead,tcplen); calccksum = ~calccksum; return calccksum; } //TCP的头部校验,求校验和 所有字节之和为0 uint16_t tcpChecksum(uint8_t *buf, uint16_t len) { // uint16_t *headerPtr; // uint16_t check_sum; // int32_t n,sum; // // sum = 0; // headerPtr = (uint16_t *)buf; // for(n = 0; n < len/2; n++) // { // sum += *headerPtr++; // } // check_sum = ((sum>>16) &0xFFFF) + (sum&0xFFFF); // check_sum = ~check_sum; // return check_sum; uint16_t calccksum; calccksum = ip_chksum(0,buf,len); calccksum = ~calccksum; return calccksum; } //直接计算法计算CRC16 unsigned int cal_crc16(unsigned char buffer[], unsigned char len) { unsigned char i = 0, j = 0; unsigned int crc_register = 0; //总字节数 while (len-- != 0) { //一个字节8位,故循环8次 for (i = 0x80; i != 0; i = i >> 1) { //如果最高位为1,则进行异或运算 if ((crc_register & 0x80000) != 0) { //最高位为1,左移移出 crc_register <<= 1; //与多项式进行异或运算 crc_register ^= 0x1021; } else { //最高位为0,则直接左移移出 crc_register <<= 1; } //加上本位的CRC码(不太明白?) if ((buffer[j] & i) != 0) { crc_register ^= 0x1021; } } //指向下一个字节 j++; } //返回CRC-16检验码 return (crc_register); } uint16_t cbus_crc(uint8_t pbuf[]) //校验算法与MavLink校验相似,长度不同,无额外字节 { uint8_t length = pbuf[1]; uint16_t sum = 0xFFFF; uint8_t i, stoplen; uint8_t tmp; stoplen = length + 3; i = 1; while (i < stoplen) { tmp = pbuf[i] ^ (uint8_t)(sum & 0xff); tmp ^= (tmp << 4); sum = (sum >> 8) ^ (tmp << 8) ^ (tmp << 3) ^ (tmp >> 4); i++; } return sum; } const unsigned int table[256] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 }; unsigned int crc_fullymax(unsigned char *q, int len) { unsigned int value_ = 0xa635; while (len--) { value_ = table [(value_ >> 8 ^ *q++) & 0xff] ^ (value_ << 8); } return value_; } uint8_t poweramp_CRC8(uint8_t *ptr, uint8_t len, uint8_t key) { uint8_t i; uint8_t crc=0; while(len--!=0) { for(i=0x80; i!=0; i/=2) { if((crc & 0x80) != 0) { crc *= 2; crc ^= key; } else crc *= 2; if((*ptr & i)!=0) crc ^= key; } ptr++; } return(crc); } uint8_t YRSocCalcXor(uint8_t *buf, uint8_t len) { uint8_t i = 0; uint8_t *p = 0; char checksum = 0; p = buf; checksum = *p; p++; for(i=1; i