python 下串口數據的讀取，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()
        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 = self.port.read(count)
                data_bytes=data_bytes+rec_str
                #print('當前數據接收總字節數：'+str(len(data_bytes))+' 本次接收字節數：'+str(len(rec_str)))
                #print(str(datetime.now()),':',binascii.b2a_hex(rec_str))


serialPort = 'COM6'  # 串口
baudRate = 115200  # 波特率
is_exit=False
data_bytes=bytearray()

if __name__ == '__main__':
    #打開串口
    mSerial = SerialPort(serialPort, baudRate)

    #文件寫入操作
    filename=input('請輸入文件名：比如test.csv:')
    dt=datetime.now()
    nowtime_str=dt.strftime('%y-%m-%d %I-%M-%S')  #時間
    filename=nowtime_str+'_'+filename
    out=open(filename,'a+')
    csv_writer=csv.writer(out)

    #開始數據讀取線程
    t1 = threading.Thread(target=mSerial.read_data)
    t1.setDaemon(True)
    t1.start()
    
    while not is_exit:
        #主線程:對讀取的串口數據進行處理
        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('幀類型：',frame_code,'幀長度：',frame_len,'時間戳：',frame_time)
                #print(frame_code,frame_len,frame_time)
                if frame_code==0x03:   #判斷幀類型
                    #struct 解析數據幀
                    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])
                    dt=datetime.now()
                    nowtime_str=dt.strftime('%y-%m-%d %I:%M:%S')  #時間
                    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]

                    #寫入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''

代碼簡介:本代碼主要用來處理陀螺儀發送過來的串口數據，主線程用struct模塊對串口數據進行解析，用csv模塊對解析出來的數據進行保存，子線程用來進行讀取串口數據，並將數據以字節流的方式存儲到全局變量data_bytes

筆記：

struct模塊，用於解析字節流

binascii模塊，用於十六進制形式的顯示

bytearray.fromhex()：將十六進制字符串轉為字節數組