求接解疑答惑，用python来算下图C写的CRC16 找了半天教程，还是没有解决。

##0101QN=20160801085857223;ST=32;CN=1062;PW=100000;MN=010000A8900016F000169DC0;Flag=5;CP=&&RtdInterval=30&&1C80\r\n，其中1C08 为CRC16 校验码，是对数据段QN=20160801085857223;ST=32;CN=1062;PW=100000;MN=010000A8900016F000169DC0;Flag=5;CP=&&RtdInterval=30&& 进行CRC16 校验所得的校验码

def CRC16_Checkout(puchMsg, usDataLen):
    crc_reg = 0xFFFF
    for i in range(usDataLen):
        crc_reg = (crc_reg >> 8) ^ ord(puchMsg[i])
        for j in range(8):
            check = crc_reg & 0x0001
            crc_reg >>= 1
            if check == 0x0001:
                crc_reg ^= 0xA001
    return "{:x}".format(crc_reg).upper()

s = "QN=20160801085857223;ST=32;CN=1062;PW=100000;MN=010000A8900016F000169DC0;Flag=5;CP=&&RtdInterval=30&&"
res = CRC16_Checkout(s, len(s))
print(res)
"""---1C80"""

def CRC16_Checkout(puckMsg: str, usDataLen: int) -> int:
    crc_reg = 0xFFFF
    for i in range(usDataLen):
        crc_reg = (crc_reg >> 8) ^ ord(puckMsg[i])
        for j in range(8):
            check = crc_reg & 0x0001
            crc_reg >>= 1
            if check == 0x0001:
                crc_reg ^= 0xA001
    return crc_reg


if __name__ == '__main__':
    string = "QN=20160801085857223;ST=32;CN=1062;PW=100000;MN=010000A8900016F000169DC0;Flag=5;CP=&&RtdInterval=30&&"
    print("target:", string)
    length = len(string)
    result = CRC16_Checkout(string, length)
    print('result:', result)

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