simAGV/helper/outside_uhf_reader.py

from helper.SerialPort import *
from collections import Counter
import time
import threading
import binascii

# 移植来自RMS3.0的超高频SimpleRFIDReader方法中的超高频（UHF）部分
class OutSideUHFReader:
    def __init__(self, com="/dev/ttyUSB0"):
        self.seria = None
        self.rfidData=''
        self.taskKillFlag=True
        self.noCount=0
        self.bqz=''
        try:
            self.seria = SerialPort(com, 115200,0.1)
            print('小型FID初始化成功')
        except Exception as ex:
            print('小型FID初始化失败：' + str(ex))

    # 读取
    def read(self):
        self.seria.Write(bytes.fromhex("A0 04 FF 89 01 D3"))
        while True:
            data = self.seria.Read()
            if data == None:
                continue
            else:
                break
        val = str(binascii.b2a_hex(data).decode())
        # print('valvalval:',val)
        if len(val) == 66:
            # 不同的超高频的标签的UID位置可能不一样！（注意）
            bq = val[14:38]
            self.bqz=bq
            self.noCount=0
        else:
            self.noCount+=1
            if(self.noCount>=3):
                self.bqz = ""
        # print(bqz)
        return self.bqz

    def getData(self):
        return self.rfidData

    def readDataThread(self):
        while not(self.taskKillFlag):
            try:
                dataStr=self.read()
                if(dataStr):
                    self.rfidData=dataStr
                else:
                    self.rfidData=''
                time.sleep(0.1)
            except Exception as e:
                print(str(e))

    # 启动服务
    def start(self):
        self.rfidData=''
        self.taskKillFlag=False
        if self.seria.ser:
            p = threading.Thread(target=self.readDataThread)
            p.start()
        else:
            print("打开串口设备失败！")

    # 停止服务
    def stop(self):
        self.taskKillFlag=True
        self.rfidData=''

rfid_reader = OutSideUHFReader()
rfid_reader.start()