The following is my code. I am trying to create a serial port thread in my pyQt5 GUI. I checked many examples. This is very helpful one Background thread with QThread in PyQt
I think I made a successful connection but I am confused about the signature.
SelectedItem is the selected port. The GUI is still freezing because of while loop.
I need some help. Thanks!
#!/usr/bin/env python3
#-*- coding:utf-8 -*-
# vim:fileencoding=utf-8
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from TTP_Monitor_GUI import Ui_MainWindow
import serial
import serial.tools.list_ports
import binascii
import glob
class SerialPort(QObject):
def __init__(self, parent = None):
super(SerialPort, self).__init__(parent)
# Explicit signal
newParams = pyqtSignal(str)
@pyqtSlot(str)
def ReadSerialPort(self, port):
#initialization and open the port
with serial.Serial(port, 115200, timeout=1) as ser:
print ("Starting up")
while True:
readOut = 0 #chars waiting from laser range finder
#readOut = ser.readline().decode('ascii')
readOut = ser.read(268) # Reads # Bytes
r = binascii.hexlify(readOut).decode('ascii')
print(r)
self.newParams.emit(r)
#ser.flush() #flush the buffer
if ser.isOpen() == False:
print("Serial Port is Close")
class Main(QMainWindow):
# Explicit Signal
#ser = pyqtSignal(str)
def __init__(self, parent=None):
super(QMainWindow, self).__init__(parent)
#QMainWindow.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.ui.btnRefresh.clicked.connect(self.Refresh)
self.ui.btnConnect.clicked.connect(self.Connect)
self.ListFunction(self.SerialPorts())
# Implicit Slot
def Connect(self):
Items = self.ui.listMain.selectedItems()
if len(Items) != 1:
msg = QMessageBox()
msg.setIcon(QMessageBox.Critical)
msg.setWindowTitle("BE CAREFULL!")
msg.setText("SELECT ONLY 1 ITEM!...")
msg.exec_()
else:
SelectedItem = Items[0].text()
SelectedItem = SelectedItem.split(" ")[0]
if sys.platform.startswith('win') and SelectedItem[:3] != 'COM':
msg = QMessageBox()
msg.setIcon(QMessageBox.Critical)
msg.setWindowTitle("BE CAREFULL!")
msg.setText("THERE IS A MISTAKE!...")
msg.exec_()
return
# Read Selected Serial Port
self.serialThread = QThread()
self.ser = SerialPort()
self.ser.moveToThread(self.serialThread)
self.ser.newParams.connect(self.serialThread.quit)
#self.serialThread.started.connect(self.ser.ReadSerialPort(SelectedItem))
self.serialThread.started.connect(lambda port=SelectedItem: self.ser.ReadSerialPort(port))
self.serialThread.start()
def Refresh(self):
""" Refresh List Widget """
self.ui.listMain.clear()
if self.ui.radioSerialPorts.isChecked() == True:
self.ListFunction(self.SerialPorts())
elif self.ui.radioTCP.isChecked() == True:
pass
def ListFunction(self, items):
""" Lists items into List Widget """
if type(items) == list and type(items[0]) == str:
#qApp.processEvents() # See Changes on GUI
self.ui.listMain.addItems(items)
else:
msg = QMessageBox()
msg.setIcon(QMessageBox.Critical)
msg.setWindowTitle("BE CAREFULL!")
msg.setText("ITEMS ARE WRONG!...")
msg.exec_()
def SerialPorts(self):
""" Lists serial port names """
device = []
description = []
result = []
for port in serial.tools.list_ports.comports():
device.append(port.device)
description.append(port.description)
result.append(port.device + ' - ' + port.description)
return result
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
myapp = Main()
myapp.show()
sys.exit(app.exec_())
