read serial port data and display it to textbrower in real time, but thread will block. Ask for advice
-sharp -*- coding: utf-8 -*-
-sharp Form implementation generated from reading ui file "22.ui"
-sharp
-sharp Created by: PyQt5 UI code generator 5.10.1
-sharp
-sharp WARNING! All changes made in this file will be lost!
import sys, serial, pexpect, time
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class BackendThread(QThread):
sec_changed_signal = pyqtSignal(int)
def __init__(self, sec=1000, parent=None):
super().__init__(parent)
self.sec = sec -sharp 1000ms
def run(self):
for i in range(self.sec):
self.sec_changed_signal.emit(i)
time.sleep(0.001)
class Ui_MainWindow:
def setupUi(self, MainWindow):
self.window = MainWindow
MainWindow.setObjectName("MainWindow")
MainWindow.resize(970, 575)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
self.textBrowser.setGeometry(QtCore.QRect(300, 10, 641, 521))
self.textBrowser.setMouseTracking(False)
self.textBrowser.setObjectName("textBrowser")
self.textBrowser.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.textBrowser.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.widget = QtWidgets.QWidget(self.centralwidget)
self.widget.setGeometry(QtCore.QRect(10, 40, 281, 29))
self.widget.setObjectName("widget")
self.horizontalLayout = QtWidgets.QHBoxLayout(self.widget)
self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
self.horizontalLayout.setObjectName("horizontalLayout")
-sharp start com
self.lineEdit = QtWidgets.QLineEdit(self.widget)
self.lineEdit.setObjectName("lineEdit")
self.horizontalLayout.addWidget(self.lineEdit)
self.pushButton = QtWidgets.QPushButton(self.widget)
self.pushButton.setObjectName("pushButton")
self.horizontalLayout.addWidget(self.pushButton)
self.widget1 = QtWidgets.QWidget(self.centralwidget)
self.widget1.setGeometry(QtCore.QRect(40, 440, 221, 51))
self.widget1.setObjectName("widget1")
self.horizontalLayout_3 = QtWidgets.QHBoxLayout(self.widget1)
self.horizontalLayout_3.setContentsMargins(0, 0, 0, 20)
self.horizontalLayout_3.setObjectName("horizontalLayout_3")
self.pushButton_5 = QtWidgets.QPushButton(self.widget1)
self.pushButton_5.setFlat(False)
self.pushButton_5.setObjectName("pushButton_5")
self.horizontalLayout_3.addWidget(self.pushButton_5)
self.pushButton_4 = QtWidgets.QPushButton(self.widget1)
self.pushButton_4.setObjectName("pushButton_4")
self.horizontalLayout_3.addWidget(self.pushButton_4)
self.widget2 = QtWidgets.QWidget(self.centralwidget)
self.widget2.setGeometry(QtCore.QRect(1, 123, 301, 271))
self.widget2.setObjectName("widget2")
self.verticalLayout = QtWidgets.QVBoxLayout(self.widget2)
self.verticalLayout.setContentsMargins(0, 0, 0, 0)
self.verticalLayout.setObjectName("verticalLayout")
self.label = QtWidgets.QLabel(self.widget2)
self.label.setObjectName("label")
self.verticalLayout.addWidget(self.label)
self.checkBox_6 = QtWidgets.QCheckBox(self.widget2)
self.checkBox_6.setEnabled(True)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.checkBox_6.setFont(font)
self.checkBox_6.setAutoFillBackground(False)
self.checkBox_6.setChecked(True)
self.checkBox_6.setTristate(False)
self.checkBox_6.setObjectName("checkBox_6")
self.verticalLayout.addWidget(self.checkBox_6)
self.checkBox_2 = QtWidgets.QCheckBox(self.widget2)
self.checkBox_2.setObjectName("checkBox_2")
self.verticalLayout.addWidget(self.checkBox_2)
self.checkBox_5 = QtWidgets.QCheckBox(self.widget2)
self.checkBox_5.setObjectName("checkBox_5")
self.verticalLayout.addWidget(self.checkBox_5)
self.checkBox_4 = QtWidgets.QCheckBox(self.widget2)
self.checkBox_4.setObjectName("checkBox_4")
self.verticalLayout.addWidget(self.checkBox_4)
self.checkBox_3 = QtWidgets.QCheckBox(self.widget2)
self.checkBox_3.setObjectName("checkBox_3")
self.verticalLayout.addWidget(self.checkBox_3)
self.checkBox = QtWidgets.QCheckBox(self.widget2)
self.checkBox.setObjectName("checkBox")
self.verticalLayout.addWidget(self.checkBox)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 970, 25))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.lineEdit.setText(_translate("MainWindow", ""))
self.pushButton.setText(_translate("MainWindow", "PushButton"))
self.lineEdit.selectAll()
self.lineEdit.setFocus()
self.pushButton.setText(_translate("MainWindow", ""))
self.pushButton.clicked.connect(self.startCom)
-sharp
-sharp
thread = BackendThread()
thread.sec_changed_signal.connect(self.update)
self.pushButton_5.setText(_translate("MainWindow", ""))
self.pushButton_5.clicked.connect(lambda: thread.start())
self.pushButton_4.setText(_translate("MainWindow", ""))
self.pushButton_4.clicked.connect(lambda : thread.terminate())
self.label.setText(_translate("MainWindow", ":"))
self.checkBox_6.setText(_translate("MainWindow", "All"))
self.checkBox_2.setText(_translate("MainWindow", "Head"))
self.checkBox_5.setText(_translate("MainWindow", "Wheel"))
self.checkBox_4.setText(_translate("MainWindow", "Arm"))
self.checkBox_3.setText(_translate("MainWindow", "Wheel"))
self.checkBox.setText(_translate("MainWindow", "Query"))
def startCom(self):
pass_word = self.lineEdit.text()
shell_cmd = "cd /dev && sudo chmod 777 ttyUSB*"
child = pexpect.spawn("/bin/bash", ["-c", shell_cmd]).sendline(pass_word)
@staticmethod
def readData():
pos = True
with serial.Serial("/dev/ttyUSB0", "256000") as ser:
with open("shoulder.txt", "a") as f:
while True:
s = ser.read()
h = hex(ord(s))
if h == "0xff" and pos:
f.write("\n")
f.write(time.strftime("%m-%d %H:%M:%S: ", time.localtime()))
f.write(h + " ")
pos = False
else:
f.write(
h + " "
)
pos = True
def update(self, sec):
self.readData()
text_edit = QPlainTextEdit()
text = open("shoulder.txt").read()
self.textBrowser.setPlainText(text)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
ex = Ui_MainWindow()
w = QtWidgets.QMainWindow()
ex.setupUi(w)
w.show()
sys.exit(app.exec_())
because I want to read the data from the serial port in real time and save it to a file, but when I display the data to textbrower , it will block in readData () . I don"t know what to do?