tijnkooijmans

uint16_t crc16(char* pData, int length)
{
    uint8_t i;
    uint16_t wCrc = 0xffff;
    while (length--) {
        wCrc ^= *(unsigned char *)pData++ << 8;
        for (i=0; i < 8; i++)
            wCrc = wCrc & 0x8000 ? (wCrc << 1) ^ 0x1021 : wCrc << 1;
    }
    return wCrc & 0xffff;

andresv

uint16_t ax25crc16(unsigned char *data_p, uint16_t length) {
    uint16_t crc = 0xFFFF;
    uint32_t data;
    uint16_t crc16_table[] = {
            0x0000, 0x1081, 0x2102, 0x3183,
            0x4204, 0x5285, 0x6306, 0x7387,
            0x8408, 0x9489, 0xa50a, 0xb58b,
            0xc60c, 0xd68d, 0xe70e, 0xf78f
    };