package rfid

func CRC16XMODEM(data []byte) uint16 {
	var crc uint16 = 0x0000 // 初始化 CRC 值
	polynomial := uint16(0x1021)

	for _, b := range data {
		crc ^= uint16(b) << 8
		for i := 0; i < 8; i++ {
			if crc&0x8000 != 0 {
				crc = (crc << 1) ^ polynomial
			} else {
				crc <<= 1
			}
		}
	}
	return crc
}