CRC4在C语言中的实现

#include <stdio.h>

unsigned char crc4(unsigned char data)
{
    unsigned char crc = 0x00;
    unsigned char feedback;

    for (int i = 0; i < 8; i++)
    {
        feedback = (crc ^ data) & 0x01;
        if (feedback == 0x01)
        {
            crc = crc ^ 0x18;
        }
        crc = (crc >> 1) & 0x0F;
        if (feedback == 0x01)
        {
            crc = crc | 0x80;
        }
        data = data >> 1;
    }

    return crc;
}

int main()
{
    unsigned char data = 0x55;
    unsigned char crc = crc4(data);
    printf("CRC4: 0x%02X\n", crc);

    return 0;
}