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wxTerminal.py
#!/usr/bin/env python # # A simple terminal application with wxPython. # # (C) 2001-2020 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause import codecs from serial.tools.miniterm import unichr import serial import threading import wx import wx.lib.newevent import wxSerialConfigDialog try: unichr except NameError: unichr = chr # ---------------------------------------------------------------------- # Create an own event type, so that GUI updates can be delegated # this is required as on some platforms only the main thread can # access the GUI without crashing. wxMutexGuiEnter/wxMutexGuiLeave # could be used too, but an event is more elegant. SerialRxEvent, EVT_SERIALRX = wx.lib.newevent.NewEvent() SERIALRX = wx.NewEventType() # ---------------------------------------------------------------------- ID_CLEAR = wx.NewId() ID_SAVEAS = wx.NewId() ID_SETTINGS = wx.NewId() ID_TERM = wx.NewId() ID_EXIT = wx.NewId() ID_RTS = wx.NewId() ID_DTR = wx.NewId() NEWLINE_CR = 0 NEWLINE_LF = 1 NEWLINE_CRLF = 2 class TerminalSetup: """ Placeholder for various terminal settings. Used to pass the options to the TerminalSettingsDialog. """ def __init__(self): self.echo = False self.unprintable = False self.newline = NEWLINE_CRLF class TerminalSettingsDialog(wx.Dialog): """Simple dialog with common terminal settings like echo, newline mode.""" def __init__(self, *args, **kwds): self.settings = kwds['settings'] del kwds['settings'] # begin wxGlade: TerminalSettingsDialog.__init__ kwds["style"] = wx.DEFAULT_DIALOG_STYLE wx.Dialog.__init__(self, *args, **kwds) self.checkbox_echo = wx.CheckBox(self, -1, "Local Echo") self.checkbox_unprintable = wx.CheckBox(self, -1, "Show unprintable characters") self.radio_box_newline = wx.RadioBox(self, -1, "Newline Handling", choices=["CR only", "LF only", "CR+LF"], majorDimension=0, style=wx.RA_SPECIFY_ROWS) self.sizer_4_staticbox = wx.StaticBox(self, -1, "Input/Output") self.button_ok = wx.Button(self, wx.ID_OK, "") self.button_cancel = wx.Button(self, wx.ID_CANCEL, "") self.__set_properties() self.__do_layout() # end wxGlade self.__attach_events() self.checkbox_echo.SetValue(self.settings.echo) self.checkbox_unprintable.SetValue(self.settings.unprintable) self.radio_box_newline.SetSelection(self.settings.newline) def __set_properties(self): # begin wxGlade: TerminalSettingsDialog.__set_properties self.SetTitle("Terminal Settings") self.radio_box_newline.SetSelection(0) self.button_ok.SetDefault() # end wxGlade def __do_layout(self): # begin wxGlade: TerminalSettingsDialog.__do_layout sizer_2 = wx.BoxSizer(wx.VERTICAL) sizer_3 = wx.BoxSizer(wx.HORIZONTAL) self.sizer_4_staticbox.Lower() sizer_4 = wx.StaticBoxSizer(self.sizer_4_staticbox, wx.VERTICAL) sizer_4.Add(self.checkbox_echo, 0, wx.ALL, 4) sizer_4.Add(self.checkbox_unprintable, 0, wx.ALL, 4) sizer_4.Add(self.radio_box_newline, 0, 0, 0) sizer_2.Add(sizer_4, 0, wx.EXPAND, 0) sizer_3.Add(self.button_ok, 0, 0, 0) sizer_3.Add(self.button_cancel, 0, 0, 0) sizer_2.Add(sizer_3, 0, wx.ALL | wx.ALIGN_RIGHT, 4) self.SetSizer(sizer_2) sizer_2.Fit(self) self.Layout() # end wxGlade def __attach_events(self): self.Bind(wx.EVT_BUTTON, self.OnOK, id=self.button_ok.GetId()) self.Bind(wx.EVT_BUTTON, self.OnCancel, id=self.button_cancel.GetId()) def OnOK(self, events): """Update data wil new values and close dialog.""" self.settings.echo = self.checkbox_echo.GetValue() self.settings.unprintable = self.checkbox_unprintable.GetValue() self.settings.newline = self.radio_box_newline.GetSelection() self.EndModal(wx.ID_OK) def OnCancel(self, events): """Do not update data but close dialog.""" self.EndModal(wx.ID_CANCEL) # end of class TerminalSettingsDialog class TerminalFrame(wx.Frame): """Simple terminal program for wxPython""" def __init__(self, *args, **kwds): self.serial = serial.Serial() self.serial.timeout = 0.5 # make sure that the alive event can be checked from time to time self.settings = TerminalSetup() # placeholder for the settings self.thread = None self.alive = threading.Event() # begin wxGlade: TerminalFrame.__init__ kwds["style"] = wx.DEFAULT_FRAME_STYLE wx.Frame.__init__(self, *args, **kwds) # Menu Bar self.frame_terminal_menubar = wx.MenuBar() wxglade_tmp_menu = wx.Menu() wxglade_tmp_menu.Append(ID_CLEAR, "&Clear", "", wx.ITEM_NORMAL) wxglade_tmp_menu.Append(ID_SAVEAS, "&Save Text As...", "", wx.ITEM_NORMAL) wxglade_tmp_menu.AppendSeparator() wxglade_tmp_menu.Append(ID_TERM, "&Terminal Settings...", "", wx.ITEM_NORMAL) wxglade_tmp_menu.AppendSeparator() wxglade_tmp_menu.Append(ID_EXIT, "&Exit", "", wx.ITEM_NORMAL) self.frame_terminal_menubar.Append(wxglade_tmp_menu, "&File") wxglade_tmp_menu = wx.Menu() wxglade_tmp_menu.Append(ID_RTS, "RTS", "", wx.ITEM_CHECK) wxglade_tmp_menu.Append(ID_DTR, "&DTR", "", wx.ITEM_CHECK) wxglade_tmp_menu.Append(ID_SETTINGS, "&Port Settings...", "", wx.ITEM_NORMAL) self.frame_terminal_menubar.Append(wxglade_tmp_menu, "Serial Port") self.SetMenuBar(self.frame_terminal_menubar) # Menu Bar end self.text_ctrl_output = wx.TextCtrl(self, -1, "", style=wx.TE_MULTILINE | wx.TE_READONLY) self.__set_properties() self.__do_layout() self.Bind(wx.EVT_MENU, self.OnClear, id=ID_CLEAR) self.Bind(wx.EVT_MENU, self.OnSaveAs, id=ID_SAVEAS) self.Bind(wx.EVT_MENU, self.OnTermSettings, id=ID_TERM) self.Bind(wx.EVT_MENU, self.OnExit, id=ID_EXIT) self.Bind(wx.EVT_MENU, self.OnRTS, id=ID_RTS) self.Bind(wx.EVT_MENU, self.OnDTR, id=ID_DTR) self.Bind(wx.EVT_MENU, self.OnPortSettings, id=ID_SETTINGS) # end wxGlade self.__attach_events() # register events self.OnPortSettings(None) # call setup dialog on startup, opens port if not self.alive.isSet(): self.Close() def StartThread(self): """Start the receiver thread""" self.thread = threading.Thread(target=self.ComPortThread) self.thread.setDaemon(1) self.alive.set() self.thread.start() self.serial.rts = True self.serial.dtr = True self.frame_terminal_menubar.Check(ID_RTS, self.serial.rts) self.frame_terminal_menubar.Check(ID_DTR, self.serial.dtr) def StopThread(self): """Stop the receiver thread, wait until it's finished.""" if self.thread is not None: self.alive.clear() # clear alive event for thread self.thread.join() # wait until thread has finished self.thread = None def __set_properties(self): # begin wxGlade: TerminalFrame.__set_properties self.SetTitle("Serial Terminal") self.SetSize((546, 383)) self.text_ctrl_output.SetFont(wx.Font(9, wx.MODERN, wx.NORMAL, wx.NORMAL, 0, "")) # end wxGlade def __do_layout(self): # begin wxGlade: TerminalFrame.__do_layout sizer_1 = wx.BoxSizer(wx.VERTICAL) sizer_1.Add(self.text_ctrl_output, 1, wx.EXPAND, 0) self.SetSizer(sizer_1) self.Layout() # end wxGlade def __attach_events(self): # register events at the controls self.Bind(wx.EVT_MENU, self.OnClear, id=ID_CLEAR) self.Bind(wx.EVT_MENU, self.OnSaveAs, id=ID_SAVEAS) self.Bind(wx.EVT_MENU, self.OnExit, id=ID_EXIT) self.Bind(wx.EVT_MENU, self.OnPortSettings, id=ID_SETTINGS) self.Bind(wx.EVT_MENU, self.OnTermSettings, id=ID_TERM) self.text_ctrl_output.Bind(wx.EVT_CHAR, self.OnKey) self.Bind(wx.EVT_CHAR_HOOK, self.OnKey) self.Bind(EVT_SERIALRX, self.OnSerialRead) self.Bind(wx.EVT_CLOSE, self.OnClose) def OnExit(self, event): # wxGlade: TerminalFrame.<event_handler> """Menu point Exit""" self.Close() def OnClose(self, event): """Called on application shutdown.""" self.StopThread() # stop reader thread self.serial.close() # cleanup self.Destroy() # close windows, exit app def OnSaveAs(self, event): # wxGlade: TerminalFrame.<event_handler> """Save contents of output window.""" with wx.FileDialog( None, "Save Text As...", ".", "", "Text File|*.txt|All Files|*", wx.SAVE) as dlg: if dlg.ShowModal() == wx.ID_OK: filename = dlg.GetPath() with codecs.open(filename, 'w', encoding='utf-8') as f: text = self.text_ctrl_output.GetValue().encode("utf-8") f.write(text) def OnClear(self, event): # wxGlade: TerminalFrame.<event_handler> """Clear contents of output window.""" self.text_ctrl_output.Clear() def OnPortSettings(self, event): # wxGlade: TerminalFrame.<event_handler> """ Show the port settings dialog. The reader thread is stopped for the settings change. """ if event is not None: # will be none when called on startup self.StopThread() self.serial.close() ok = False while not ok: with wxSerialConfigDialog.SerialConfigDialog( self, -1, "", show=wxSerialConfigDialog.SHOW_BAUDRATE | wxSerialConfigDialog.SHOW_FORMAT | wxSerialConfigDialog.SHOW_FLOW, serial=self.serial) as dialog_serial_cfg: dialog_serial_cfg.CenterOnParent() result = dialog_serial_cfg.ShowModal() # open port if not called on startup, open it on startup and OK too if result == wx.ID_OK or event is not None: try: self.serial.open() except serial.SerialException as e: with wx.MessageDialog(self, str(e), "Serial Port Error", wx.OK | wx.ICON_ERROR)as dlg: dlg.ShowModal() else: self.StartThread() self.SetTitle("Serial Terminal on {} [{},{},{},{}{}{}]".format( self.serial.portstr, self.serial.baudrate, self.serial.bytesize, self.serial.parity, self.serial.stopbits, ' RTS/CTS' if self.serial.rtscts else '', ' Xon/Xoff' if self.serial.xonxoff else '', )) ok = True else: # on startup, dialog aborted self.alive.clear() ok = True def OnTermSettings(self, event): # wxGlade: TerminalFrame.<event_handler> """\ Menu point Terminal Settings. Show the settings dialog with the current terminal settings. """ with TerminalSettingsDialog(self, -1, "", settings=self.settings) as dialog: dialog.CenterOnParent() dialog.ShowModal() def OnKey(self, event): """\ Key event handler. If the key is in the ASCII range, write it to the serial port. Newline handling and local echo is also done here. """ code = event.GetUnicodeKey() # if code < 256: # XXX bug in some versions of wx returning only capital letters # code = event.GetKeyCode() if code == 13: # is it a newline? (check for CR which is the RETURN key) if self.settings.echo: # do echo if needed self.text_ctrl_output.AppendText('\n') if self.settings.newline == NEWLINE_CR: self.serial.write(b'\r') # send CR elif self.settings.newline == NEWLINE_LF: self.serial.write(b'\n') # send LF elif self.settings.newline == NEWLINE_CRLF: self.serial.write(b'\r\n') # send CR+LF else: char = unichr(code) if self.settings.echo: # do echo if needed self.WriteText(char) self.serial.write(char.encode('UTF-8', 'replace')) # send the character event.StopPropagation() def WriteText(self, text): if self.settings.unprintable: text = ''.join([c if (c >= ' ' and c != '\x7f') else unichr(0x2400 + ord(c)) for c in text]) self.text_ctrl_output.AppendText(text) def OnSerialRead(self, event): """Handle input from the serial port.""" self.WriteText(event.data.decode('UTF-8', 'replace')) def ComPortThread(self): """\ Thread that handles the incoming traffic. Does the basic input transformation (newlines) and generates an SerialRxEvent """ while self.alive.isSet(): b = self.serial.read(self.serial.in_waiting or 1) if b: # newline transformation if self.settings.newline == NEWLINE_CR: b = b.replace(b'\r', b'\n') elif self.settings.newline == NEWLINE_LF: pass elif self.settings.newline == NEWLINE_CRLF: b = b.replace(b'\r\n', b'\n') wx.PostEvent(self, SerialRxEvent(data=b)) def OnRTS(self, event): # wxGlade: TerminalFrame.<event_handler> self.serial.rts = event.IsChecked() def OnDTR(self, event): # wxGlade: TerminalFrame.<event_handler> self.serial.dtr = event.IsChecked() # end of class TerminalFrame class MyApp(wx.App): def OnInit(self): frame_terminal = TerminalFrame(None, -1, "") self.SetTopWindow(frame_terminal) frame_terminal.Show(True) return 1 # end of class MyApp if __name__ == "__main__": app = MyApp(0) app.MainLoop()
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