python的crc-16校验

原创于 2024-11-20 13:56:24 发布 · 326 阅读

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#python #开发语言

import struct
import logging


def calc_crc16(string):
    data = bytearray.fromhex(string)
    logging.info(type(data))
    crc = 0xFFFF
    for pos in data:
        crc ^= pos
        for i in range(8):
            if (crc & 1) != 0:
                crc >>= 1
                crc ^= 0xA001
            else:
                crc >>= 1

    return ((crc & 0xff) << 8) + (crc >> 8)


data_hex_str = "A55AD0001A0069643A553030310A46315F4765735F526573756C743A47303031"
value = calc_crc16(data_hex_str)
crc_bytes = struct.pack('<H', value)
print(crc_bytes)