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two types of check sum calculation
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| http://study.marearts.com/2017/05/two-types-of-check-sum.html | |
| //intel method | |
| unsigned char CalcChecksum(unsigned char *data, int leng) | |
| { | |
| unsigned char csum; | |
| csum = 0xFF; | |
| for (; leng > 0; leng--) | |
| csum += *data++; | |
| return ~csum; | |
| } | |
| //motorora method | |
| unsigned char CalcChecksum2(unsigned char *data, int leng) | |
| { | |
| unsigned char csum; | |
| csum = 0; | |
| for (; leng > 0; leng--) | |
| csum += *data++; | |
| return 0xFF - csum; | |
| } |
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http://study.marearts.com/2017/05/two-types-of-check-sum.html