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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import QIODeviceBase, Slot
from PySide6.QtWidgets import QLabel, QMainWindow, QMessageBox
from PySide6.QtSerialPort import QSerialPort
from ui_mainwindow import Ui_MainWindow
from console import Console
from settingsdialog import SettingsDialog
HELP = """The <b>Simple Terminal</b> example demonstrates how to
use the Qt Serial Port module in modern GUI applications
using Qt, with a menu bar, toolbars, and a status bar."""
def description(s):
return (f"Connected to {s.name} : {s.string_baud_rate}, "
f"{s.string_data_bits}, {s.string_parity}, {s.string_stop_bits}, "
f"{s.string_flow_control}")
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.m_ui = Ui_MainWindow()
self.m_status = QLabel()
self.m_console = Console()
self.m_settings = SettingsDialog(self)
self.m_serial = QSerialPort(self)
self.m_ui.setupUi(self)
self.m_console.setEnabled(False)
self.setCentralWidget(self.m_console)
self.m_ui.actionConnect.setEnabled(True)
self.m_ui.actionDisconnect.setEnabled(False)
self.m_ui.actionQuit.setEnabled(True)
self.m_ui.actionConfigure.setEnabled(True)
self.m_ui.statusBar.addWidget(self.m_status)
self.m_ui.actionConnect.triggered.connect(self.open_serial_port)
self.m_ui.actionDisconnect.triggered.connect(self.close_serial_port)
self.m_ui.actionQuit.triggered.connect(self.close)
self.m_ui.actionConfigure.triggered.connect(self.m_settings.show)
self.m_ui.actionClear.triggered.connect(self.m_console.clear)
self.m_ui.actionAbout.triggered.connect(self.about)
self.m_ui.actionAboutQt.triggered.connect(qApp.aboutQt) # noqa: F821
self.m_serial.errorOccurred.connect(self.handle_error)
self.m_serial.readyRead.connect(self.read_data)
self.m_console.get_data.connect(self.write_data)
@Slot()
def open_serial_port(self):
s = self.m_settings.settings()
self.m_serial.setPortName(s.name)
self.m_serial.setBaudRate(s.baud_rate)
self.m_serial.setDataBits(s.data_bits)
self.m_serial.setParity(s.parity)
self.m_serial.setStopBits(s.stop_bits)
self.m_serial.setFlowControl(s.flow_control)
if self.m_serial.open(QIODeviceBase.ReadWrite):
self.m_console.setEnabled(True)
self.m_console.set_local_echo_enabled(s.local_echo_enabled)
self.m_ui.actionConnect.setEnabled(False)
self.m_ui.actionDisconnect.setEnabled(True)
self.m_ui.actionConfigure.setEnabled(False)
self.show_status_message(description(s))
else:
QMessageBox.critical(self, "Error", self.m_serial.errorString())
self.show_status_message("Open error")
@Slot()
def close_serial_port(self):
if self.m_serial.isOpen():
self.m_serial.close()
self.m_console.setEnabled(False)
self.m_ui.actionConnect.setEnabled(True)
self.m_ui.actionDisconnect.setEnabled(False)
self.m_ui.actionConfigure.setEnabled(True)
self.show_status_message("Disconnected")
@Slot()
def about(self):
QMessageBox.about(self, "About Simple Terminal", HELP)
@Slot(bytearray)
def write_data(self, data):
self.m_serial.write(data)
@Slot()
def read_data(self):
data = self.m_serial.readAll()
self.m_console.put_data(data.data())
@Slot(QSerialPort.SerialPortError)
def handle_error(self, error):
if error == QSerialPort.ResourceError:
QMessageBox.critical(self, "Critical Error",
self.m_serial.errorString())
self.close_serial_port()
@Slot(str)
def show_status_message(self, message):
self.m_status.setText(message)
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