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#!/usr/bin/env python
#
# A simple terminal application with wxPython.
#
# (C) 2001-2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
import codecs
import serial
import threading
import wx
import wxSerialConfigDialog
# ----------------------------------------------------------------------
# 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.
SERIALRX = wx.NewEventType()
# bind to serial data receive events
EVT_SERIALRX = wx.PyEventBinder(SERIALRX, 0)
class SerialRxEvent(wx.PyCommandEvent):
eventType = SERIALRX
def __init__(self, windowID, data):
wx.PyCommandEvent.__init__(self, self.eventType, windowID)
self.data = data
def Clone(self):
self.__class__(self.GetId(), self.data)
# ----------------------------------------------------------------------
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(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 %s [%s,%s,%s,%s%s%s]" % (
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
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')
event = SerialRxEvent(self.GetId(), b)
self.GetEventHandler().AddPendingEvent(event)
#~ self.OnSerialRead(text) # output text in window
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.Checked()
# end of class TerminalFrame
class MyApp(wx.App):
def OnInit(self):
wx.InitAllImageHandlers()
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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