python下串⼝数据的读取，解析，和保存-
#!/usr/bin/python
# -*-coding: utf-8 -*-
import serial
import threading
import binascii
from datetime import datetime
import struct
import csv
class SerialPort:
def__init__(self, port, buand):
self.port = serial.Serial(port, buand)
self.port.close()
python怎么读取串口数据if not self.port.isOpen():
self.port.open()
def port_open(self):
if not self.port.isOpen():
self.port.open()
def port_close(self):
self.port.close()
def send_data(self):
self.port.write('')
def read_data(self):
global is_exit
global data_bytes
while not is_exit:
count = self.port.inWaiting()
if count > 0:
rec_str = ad(count)
data_bytes=data_bytes+rec_str
#print('当前数据接收总字节数：'+str(len(data_bytes))+' 本次接收字节数：'+str(len(rec_str)))
#print(w()),':',binascii.b2a_hex(rec_str))
serialPort = 'COM6'# 串⼝
baudRate = 115200  # 波特率
is_exit=False
data_bytes=bytearray()
if__name__ == '__main__':
#打开串⼝
mSerial = SerialPort(serialPort, baudRate)
#⽂件写⼊操作
filename=input('请输⼊⽂件名：⽐如test.csv:')
w()
nowtime_str=dt.strftime('%y-%m-%d %I-%M-%S')  #时间
filename=nowtime_str+'_'+filename
out=open(filename,'a+')
csv_writer=csv.writer(out)
#开始数据读取线程
t1 = threading.Thread(ad_data)
t1.setDaemon(True)
t1.start()
while not is_exit:
#主线程：对读取的串⼝数据进⾏处理
data_len=len(data_bytes)
i=0
while(i<data_len-1):
if(data_bytes[i]==0xFF and data_bytes[i+1]==0x5A):
frame_code=data_bytes[i+2]
frame_len=struct.unpack('<H',data_bytes[i+4:i+6])[0]
frame_time=struct.unpack('<I',data_bytes[i+6:i+10])[0]
print('帧类型：',frame_code,'帧长度：',frame_len,'时间戳：',frame_time)
#print(frame_code,frame_len,frame_time)
if frame_code==0x03:  #判断帧类型
#struct 解析数据帧
accelerated_x,accelerated_y,accelerated_z,angular_x,angular_y,angular_z,tem,speed_x,speed_y,speed_z,\
angular_v_x,angular_v_y,angular_v_z=struct.unpack('<fffffffffffff',data_bytes[i+12:i+12+frame_len-6])
w()
nowtime_str=dt.strftime('%y-%m-%d %I:%M:%S')  #时间
loc_str=[nowtime_str,frame_time,accelerated_x,accelerated_y,accelerated_z,angular_x,angular_y,angular_z,tem,speed_x,speed_y,speed_z,\                    angular_v_x,angular_v_y,angular_v_z]
#写⼊csv⽂件
try:
csv_writer.writerow(loc_str)
except Exception as e:
raise e
i=i+6+frame_len+3
else:
i=i+1
data_bytes[0:i]=b''
代码简介：本代码主要⽤来处理陀螺仪发送过来的串⼝数据，主线程⽤struct模块对串⼝数据进⾏解析，⽤csv模块对解析出来的数据进⾏保存，⼦线程⽤来进⾏读取串⼝数据，并将数据以字节流的⽅式存储到全局变量data_bytes
笔记：
struct模块，⽤于解析字节流
binascii模块，⽤于⼗六进制形式的显⽰
bytearray.fromhex()：将⼗六进制字符串转为字节数组

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