python uart读到后面就全乱 python读取串口

import time
import serial
import chardet

def ser_get():
    '''串口连接'''

    portx = 'com3' #端口号

    bps = 115200 # 波特率

    timeout = None #超时时间设置，None代表永远等待操作

    ser = serial.Serial(portx,bps,timeout = timeout) #打开串口，并得到串口对象
    #print('串口详情参数：',ser)

    return  ser

def ser_read():
    '''串口读取'''
    print('正在读取串口内容!')
    data  = ''
    while True:
        data = ser_get().reanline()  #获取串口内容
        print('***********')
        time1 = time.time()
        t = time.ctime()
        print(t,':')
        print(data)
        with open('D:/test.txt','a') as f:
            f.writelines(t)
            f.writelines(':\n')
            try:
                f.writelines(data.decode(encofing = 'utf-8'))
            except Exception as e :
                print(e)