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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. uint8_t crc2(uint8_t data) {
  5.     uint8_t poly = 0x07;   // CRC-2 polynomial (111)
  6.     uint8_t crc = 0x00;
  7.  
  8.     for (int i = 0; i < 8; i++) {
  9.         uint8_t bit = ((data >> (7 - i)) & 1) ^ ((crc >> 1) & 1);
  10.         crc = (crc << 1) & 0x03; // keep only 2 bits
  11.  
  12.         if (bit)
  13.             crc ^= poly & 0x03;  // apply CRC-2 polynomial
  14.     }
  15.     return crc & 0x03;
  16. }
  17.  
  18. int main() {
  19.     uint8_t data = 0xAB;
  20.     uint8_t result = crc2(data);
  21.  
  22.     printf("CRC-2 of 0x%X = %u\n", data, result);
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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CRC-2 of 0xAB = 2
https://ideone.com/xF5Cuv
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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