58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
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#include "ToolCheck.h"
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#include <stdio.h>
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/* 8位异或校验代码 */
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void ToolCheckXor(unsigned char *Buf, unsigned int BufLen , unsigned char *Xor)
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{
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unsigned int i;
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*Xor = 0;
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for (i = 0; i < BufLen; i++) {
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*Xor = (*Xor) ^ Buf[i];
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}
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}
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/* 8位校验和 */
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void ToolCheckSum(unsigned char *Buf, unsigned int BufLen , unsigned char *Sum)
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{
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unsigned int i;
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*Sum = 0;
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for (i = 0; i < BufLen; i++) {
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*Sum = (*Sum) + Buf[i];
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}
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}
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/* CRC 0x31校验 */
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void ToolCheckCrc8_0x31(unsigned char *Buf, unsigned int BufLen , unsigned char *Crc)
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{
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unsigned char i = 0;
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while (BufLen--) {
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(*Crc) ^= *Buf++;
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for (i = 0; i < 8; i++) {
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if ((*Crc) & 0x01) {
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(*Crc) = ((*Crc) >> 1) ^ 0x8c;
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} else {
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(*Crc) = ((*Crc) >> 1);
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}
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}
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}
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}
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/* CRC16 modbus */
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void ToolCheckCrc8_0x8005(unsigned char *Buf, unsigned int BufLen , unsigned short *Crc)
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{
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unsigned short i, j, tmp, CRC16;
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CRC16 = 0xffff;
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for (i = 0; i < BufLen; i++) {
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CRC16 ^= Buf[i];
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for (j = 0; j < 8; j++) {
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tmp = (unsigned short)(CRC16 & 0x0001);
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CRC16 >>= 1;
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if (tmp == 1) {
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CRC16 ^= 0xA001; //异或多项式
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}
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}
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}
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*Crc = CRC16;
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}
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