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#!/usr/bin/env python
#
# Very simple serial terminal
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C)2002-2020 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
from __future__ import absolute_import
import codecs
import os
import sys
import threading
import serial
from serial.tools.list_ports import comports
from serial.tools import hexlify_codec
# pylint: disable=wrong-import-order,wrong-import-position
codecs.register(lambda c: hexlify_codec.getregentry() if c == 'hexlify' else None)
try:
raw_input
except NameError:
# pylint: disable=redefined-builtin,invalid-name
raw_input = input # in python3 it's "raw"
unichr = chr
def key_description(character):
"""generate a readable description for a key"""
ascii_code = ord(character)
if ascii_code < 32:
return 'Ctrl+{:c}'.format(ord('@') + ascii_code)
else:
return repr(character)
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
class ConsoleBase(object):
"""OS abstraction for console (input/output codec, no echo)"""
def __init__(self):
if sys.version_info >= (3, 0):
self.byte_output = sys.stdout.buffer
else:
self.byte_output = sys.stdout
self.output = sys.stdout
def setup(self):
"""Set console to read single characters, no echo"""
def cleanup(self):
"""Restore default console settings"""
def getkey(self):
"""Read a single key from the console"""
return None
def write_bytes(self, byte_string):
"""Write bytes (already encoded)"""
self.byte_output.write(byte_string)
self.byte_output.flush()
def write(self, text):
"""Write string"""
self.output.write(text)
self.output.flush()
def cancel(self):
"""Cancel getkey operation"""
# - - - - - - - - - - - - - - - - - - - - - - - -
# context manager:
# switch terminal temporary to normal mode (e.g. to get user input)
def __enter__(self):
self.cleanup()
return self
def __exit__(self, *args, **kwargs):
self.setup()
if os.name == 'nt': # noqa
import msvcrt
import ctypes
import platform
class Out(object):
"""file-like wrapper that uses os.write"""
def __init__(self, fd):
self.fd = fd
def flush(self):
pass
def write(self, s):
os.write(self.fd, s)
class Console(ConsoleBase):
fncodes = {
';': '\1bOP', # F1
'<': '\1bOQ', # F2
'=': '\1bOR', # F3
'>': '\1bOS', # F4
'?': '\1b[15~', # F5
'@': '\1b[17~', # F6
'A': '\1b[18~', # F7
'B': '\1b[19~', # F8
'C': '\1b[20~', # F9
'D': '\1b[21~', # F10
}
navcodes = {
'H': '\x1b[A', # UP
'P': '\x1b[B', # DOWN
'K': '\x1b[D', # LEFT
'M': '\x1b[C', # RIGHT
'G': '\x1b[H', # HOME
'O': '\x1b[F', # END
'R': '\x1b[2~', # INSERT
'S': '\x1b[3~', # DELETE
'I': '\x1b[5~', # PGUP
'Q': '\x1b[6~', # PGDN
}
def __init__(self):
super(Console, self).__init__()
self._saved_ocp = ctypes.windll.kernel32.GetConsoleOutputCP()
self._saved_icp = ctypes.windll.kernel32.GetConsoleCP()
ctypes.windll.kernel32.SetConsoleOutputCP(65001)
ctypes.windll.kernel32.SetConsoleCP(65001)
# ANSI handling available through SetConsoleMode since Windows 10 v1511
# https://en.wikipedia.org/wiki/ANSI_escape_code#cite_note-win10th2-1
if platform.release() == '10' and int(platform.version().split('.')[2]) > 10586:
ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004
import ctypes.wintypes as wintypes
if not hasattr(wintypes, 'LPDWORD'): # PY2
wintypes.LPDWORD = ctypes.POINTER(wintypes.DWORD)
SetConsoleMode = ctypes.windll.kernel32.SetConsoleMode
GetConsoleMode = ctypes.windll.kernel32.GetConsoleMode
GetStdHandle = ctypes.windll.kernel32.GetStdHandle
mode = wintypes.DWORD()
GetConsoleMode(GetStdHandle(-11), ctypes.byref(mode))
if (mode.value & ENABLE_VIRTUAL_TERMINAL_PROCESSING) == 0:
SetConsoleMode(GetStdHandle(-11), mode.value | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
self._saved_cm = mode
self.output = codecs.getwriter('UTF-8')(Out(sys.stdout.fileno()), 'replace')
# the change of the code page is not propagated to Python, manually fix it
sys.stderr = codecs.getwriter('UTF-8')(Out(sys.stderr.fileno()), 'replace')
sys.stdout = self.output
self.output.encoding = 'UTF-8' # needed for input
def __del__(self):
ctypes.windll.kernel32.SetConsoleOutputCP(self._saved_ocp)
ctypes.windll.kernel32.SetConsoleCP(self._saved_icp)
try:
ctypes.windll.kernel32.SetConsoleMode(ctypes.windll.kernel32.GetStdHandle(-11), self._saved_cm)
except AttributeError: # in case no _saved_cm
pass
def getkey(self):
while True:
z = msvcrt.getwch()
if z == unichr(13):
return unichr(10)
elif z is unichr(0) or z is unichr(0xe0):
try:
code = msvcrt.getwch()
if z is unichr(0):
return self.fncodes[code]
else:
return self.navcodes[code]
except KeyError:
pass
else:
return z
def cancel(self):
# CancelIo, CancelSynchronousIo do not seem to work when using
# getwch, so instead, send a key to the window with the console
hwnd = ctypes.windll.kernel32.GetConsoleWindow()
ctypes.windll.user32.PostMessageA(hwnd, 0x100, 0x0d, 0)
elif os.name == 'posix':
import atexit
import termios
import fcntl
class Console(ConsoleBase):
def __init__(self):
super(Console, self).__init__()
self.fd = sys.stdin.fileno()
self.old = termios.tcgetattr(self.fd)
atexit.register(self.cleanup)
if sys.version_info < (3, 0):
self.enc_stdin = codecs.getreader(sys.stdin.encoding)(sys.stdin)
else:
self.enc_stdin = sys.stdin
def setup(self):
new = termios.tcgetattr(self.fd)
new[3] = new[3] & ~termios.ICANON & ~termios.ECHO & ~termios.ISIG
new[6][termios.VMIN] = 1
new[6][termios.VTIME] = 0
termios.tcsetattr(self.fd, termios.TCSANOW, new)
def getkey(self):
c = self.enc_stdin.read(1)
if c == unichr(0x7f):
c = unichr(8) # map the BS key (which yields DEL) to backspace
return c
def cancel(self):
fcntl.ioctl(self.fd, termios.TIOCSTI, b'\0')
def cleanup(self):
termios.tcsetattr(self.fd, termios.TCSAFLUSH, self.old)
else:
raise NotImplementedError(
'Sorry no implementation for your platform ({}) available.'.format(sys.platform))
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
class Transform(object):
"""do-nothing: forward all data unchanged"""
def rx(self, text):
"""text received from serial port"""
return text
def tx(self, text):
"""text to be sent to serial port"""
return text
def echo(self, text):
"""text to be sent but displayed on console"""
return text
class CRLF(Transform):
"""ENTER sends CR+LF"""
def tx(self, text):
return text.replace('\n', '\r\n')
class CR(Transform):
"""ENTER sends CR"""
def rx(self, text):
return text.replace('\r', '\n')
def tx(self, text):
return text.replace('\n', '\r')
class LF(Transform):
"""ENTER sends LF"""
class NoTerminal(Transform):
"""remove typical terminal control codes from input"""
REPLACEMENT_MAP = dict((x, 0x2400 + x) for x in range(32) if unichr(x) not in '\r\n\b\t')
REPLACEMENT_MAP.update(
{
0x7F: 0x2421, # DEL
0x9B: 0x2425, # CSI
})
def rx(self, text):
return text.translate(self.REPLACEMENT_MAP)
echo = rx
class NoControls(NoTerminal):
"""Remove all control codes, incl. CR+LF"""
REPLACEMENT_MAP = dict((x, 0x2400 + x) for x in range(32))
REPLACEMENT_MAP.update(
{
0x20: 0x2423, # visual space
0x7F: 0x2421, # DEL
0x9B: 0x2425, # CSI
})
class Printable(Transform):
"""Show decimal code for all non-ASCII characters and replace most control codes"""
def rx(self, text):
r = []
for c in text:
if ' ' <= c < '\x7f' or c in '\r\n\b\t':
r.append(c)
elif c < ' ':
r.append(unichr(0x2400 + ord(c)))
else:
r.extend(unichr(0x2080 + ord(d) - 48) for d in '{:d}'.format(ord(c)))
r.append(' ')
return ''.join(r)
echo = rx
class Colorize(Transform):
"""Apply different colors for received and echo"""
def __init__(self):
# XXX make it configurable, use colorama?
self.input_color = '\x1b[37m'
self.echo_color = '\x1b[31m'
def rx(self, text):
return self.input_color + text
def echo(self, text):
return self.echo_color + text
class DebugIO(Transform):
"""Print what is sent and received"""
def rx(self, text):
sys.stderr.write(' [RX:{!r}] '.format(text))
sys.stderr.flush()
return text
def tx(self, text):
sys.stderr.write(' [TX:{!r}] '.format(text))
sys.stderr.flush()
return text
# other ideas:
# - add date/time for each newline
# - insert newline after: a) timeout b) packet end character
EOL_TRANSFORMATIONS = {
'crlf': CRLF,
'cr': CR,
'lf': LF,
}
TRANSFORMATIONS = {
'direct': Transform, # no transformation
'default': NoTerminal,
'nocontrol': NoControls,
'printable': Printable,
'colorize': Colorize,
'debug': DebugIO,
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
def ask_for_port():
"""\
Show a list of ports and ask the user for a choice. To make selection
easier on systems with long device names, also allow the input of an
index.
"""
sys.stderr.write('\n--- Available ports:\n')
ports = []
for n, (port, desc, hwid) in enumerate(sorted(comports()), 1):
sys.stderr.write('--- {:2}: {:20} {!r}\n'.format(n, port, desc))
ports.append(port)
while True:
port = raw_input('--- Enter port index or full name: ')
try:
index = int(port) - 1
if not 0 <= index < len(ports):
sys.stderr.write('--- Invalid index!\n')
continue
except ValueError:
pass
else:
port = ports[index]
return port
class Miniterm(object):
"""\
Terminal application. Copy data from serial port to console and vice versa.
Handle special keys from the console to show menu etc.
"""
def __init__(self, serial_instance, echo=False, eol='crlf', filters=()):
self.console = Console()
self.serial = serial_instance
self.echo = echo
self.raw = False
self.input_encoding = 'UTF-8'
self.output_encoding = 'UTF-8'
self.eol = eol
self.filters = filters
self.update_transformations()
self.exit_character = unichr(0x1d) # GS/CTRL+]
self.menu_character = unichr(0x14) # Menu: CTRL+T
self.alive = None
self._reader_alive = None
self.receiver_thread = None
self.rx_decoder = None
self.tx_decoder = None
def _start_reader(self):
"""Start reader thread"""
self._reader_alive = True
# start serial->console thread
self.receiver_thread = threading.Thread(target=self.reader, name='rx')
self.receiver_thread.daemon = True
self.receiver_thread.start()
def _stop_reader(self):
"""Stop reader thread only, wait for clean exit of thread"""
self._reader_alive = False
if hasattr(self.serial, 'cancel_read'):
self.serial.cancel_read()
self.receiver_thread.join()
def start(self):
"""start worker threads"""
self.alive = True
self._start_reader()
# enter console->serial loop
self.transmitter_thread = threading.Thread(target=self.writer, name='tx')
self.transmitter_thread.daemon = True
self.transmitter_thread.start()
self.console.setup()
def stop(self):
"""set flag to stop worker threads"""
self.alive = False
def join(self, transmit_only=False):
"""wait for worker threads to terminate"""
self.transmitter_thread.join()
if not transmit_only:
if hasattr(self.serial, 'cancel_read'):
self.serial.cancel_read()
self.receiver_thread.join()
def close(self):
self.serial.close()
def update_transformations(self):
"""take list of transformation classes and instantiate them for rx and tx"""
transformations = [EOL_TRANSFORMATIONS[self.eol]] + [TRANSFORMATIONS[f]
for f in self.filters]
self.tx_transformations = [t() for t in transformations]
self.rx_transformations = list(reversed(self.tx_transformations))
def set_rx_encoding(self, encoding, errors='replace'):
"""set encoding for received data"""
self.input_encoding = encoding
self.rx_decoder = codecs.getincrementaldecoder(encoding)(errors)
def set_tx_encoding(self, encoding, errors='replace'):
"""set encoding for transmitted data"""
self.output_encoding = encoding
self.tx_encoder = codecs.getincrementalencoder(encoding)(errors)
def dump_port_settings(self):
"""Write current settings to sys.stderr"""
sys.stderr.write("\n--- Settings: {p.name} {p.baudrate},{p.bytesize},{p.parity},{p.stopbits}\n".format(
p=self.serial))
sys.stderr.write('--- RTS: {:8} DTR: {:8} BREAK: {:8}\n'.format(
('active' if self.serial.rts else 'inactive'),
('active' if self.serial.dtr else 'inactive'),
('active' if self.serial.break_condition else 'inactive')))
try:
sys.stderr.write('--- CTS: {:8} DSR: {:8} RI: {:8} CD: {:8}\n'.format(
('active' if self.serial.cts else 'inactive'),
('active' if self.serial.dsr else 'inactive'),
('active' if self.serial.ri else 'inactive'),
('active' if self.serial.cd else 'inactive')))
except serial.SerialException:
# on RFC 2217 ports, it can happen if no modem state notification was
# yet received. ignore this error.
pass
sys.stderr.write('--- software flow control: {}\n'.format('active' if self.serial.xonxoff else 'inactive'))
sys.stderr.write('--- hardware flow control: {}\n'.format('active' if self.serial.rtscts else 'inactive'))
sys.stderr.write('--- serial input encoding: {}\n'.format(self.input_encoding))
sys.stderr.write('--- serial output encoding: {}\n'.format(self.output_encoding))
sys.stderr.write('--- EOL: {}\n'.format(self.eol.upper()))
sys.stderr.write('--- filters: {}\n'.format(' '.join(self.filters)))
def reader(self):
"""loop and copy serial->console"""
try:
while self.alive and self._reader_alive:
# read all that is there or wait for one byte
data = self.serial.read(self.serial.in_waiting or 1)
if data:
if self.raw:
self.console.write_bytes(data)
else:
text = self.rx_decoder.decode(data)
for transformation in self.rx_transformations:
text = transformation.rx(text)
self.console.write(text)
except serial.SerialException:
self.alive = False
self.console.cancel()
raise # XXX handle instead of re-raise?
def writer(self):
"""\
Loop and copy console->serial until self.exit_character character is
found. When self.menu_character is found, interpret the next key
locally.
"""
menu_active = False
try:
while self.alive:
try:
c = self.console.getkey()
except KeyboardInterrupt:
c = '\x03'
if not self.alive:
break
if menu_active:
self.handle_menu_key(c)
menu_active = False
elif c == self.menu_character:
menu_active = True # next char will be for menu
elif c == self.exit_character:
self.stop() # exit app
break
else:
#~ if self.raw:
text = c
for transformation in self.tx_transformations:
text = transformation.tx(text)
self.serial.write(self.tx_encoder.encode(text))
if self.echo:
echo_text = c
for transformation in self.tx_transformations:
echo_text = transformation.echo(echo_text)
self.console.write(echo_text)
except:
self.alive = False
raise
def handle_menu_key(self, c):
"""Implement a simple menu / settings"""
if c == self.menu_character or c == self.exit_character:
# Menu/exit character again -> send itself
self.serial.write(self.tx_encoder.encode(c))
if self.echo:
self.console.write(c)
elif c == '\x15': # CTRL+U -> upload file
self.upload_file()
elif c in '\x08hH?': # CTRL+H, h, H, ? -> Show help
sys.stderr.write(self.get_help_text())
elif c == '\x12': # CTRL+R -> Toggle RTS
self.serial.rts = not self.serial.rts
sys.stderr.write('--- RTS {} ---\n'.format('active' if self.serial.rts else 'inactive'))
elif c == '\x04': # CTRL+D -> Toggle DTR
self.serial.dtr = not self.serial.dtr
sys.stderr.write('--- DTR {} ---\n'.format('active' if self.serial.dtr else 'inactive'))
elif c == '\x02': # CTRL+B -> toggle BREAK condition
self.serial.break_condition = not self.serial.break_condition
sys.stderr.write('--- BREAK {} ---\n'.format('active' if self.serial.break_condition else 'inactive'))
elif c == '\x05': # CTRL+E -> toggle local echo
self.echo = not self.echo
sys.stderr.write('--- local echo {} ---\n'.format('active' if self.echo else 'inactive'))
elif c == '\x06': # CTRL+F -> edit filters
self.change_filter()
elif c == '\x0c': # CTRL+L -> EOL mode
modes = list(EOL_TRANSFORMATIONS) # keys
eol = modes.index(self.eol) + 1
if eol >= len(modes):
eol = 0
self.eol = modes[eol]
sys.stderr.write('--- EOL: {} ---\n'.format(self.eol.upper()))
self.update_transformations()
elif c == '\x01': # CTRL+A -> set encoding
self.change_encoding()
elif c == '\x09': # CTRL+I -> info
self.dump_port_settings()
#~ elif c == '\x01': # CTRL+A -> cycle escape mode
#~ elif c == '\x0c': # CTRL+L -> cycle linefeed mode
elif c in 'pP': # P -> change port
self.change_port()
elif c in 'zZ': # S -> suspend / open port temporarily
self.suspend_port()
elif c in 'bB': # B -> change baudrate
self.change_baudrate()
elif c == '8': # 8 -> change to 8 bits
self.serial.bytesize = serial.EIGHTBITS
self.dump_port_settings()
elif c == '7': # 7 -> change to 8 bits
self.serial.bytesize = serial.SEVENBITS
self.dump_port_settings()
elif c in 'eE': # E -> change to even parity
self.serial.parity = serial.PARITY_EVEN
self.dump_port_settings()
elif c in 'oO': # O -> change to odd parity
self.serial.parity = serial.PARITY_ODD
self.dump_port_settings()
elif c in 'mM': # M -> change to mark parity
self.serial.parity = serial.PARITY_MARK
self.dump_port_settings()
elif c in 'sS': # S -> change to space parity
self.serial.parity = serial.PARITY_SPACE
self.dump_port_settings()
elif c in 'nN': # N -> change to no parity
self.serial.parity = serial.PARITY_NONE
self.dump_port_settings()
elif c == '1': # 1 -> change to 1 stop bits
self.serial.stopbits = serial.STOPBITS_ONE
self.dump_port_settings()
elif c == '2': # 2 -> change to 2 stop bits
self.serial.stopbits = serial.STOPBITS_TWO
self.dump_port_settings()
elif c == '3': # 3 -> change to 1.5 stop bits
self.serial.stopbits = serial.STOPBITS_ONE_POINT_FIVE
self.dump_port_settings()
elif c in 'xX': # X -> change software flow control
self.serial.xonxoff = (c == 'X')
self.dump_port_settings()
elif c in 'rR': # R -> change hardware flow control
self.serial.rtscts = (c == 'R')
self.dump_port_settings()
elif c in 'qQ':
self.stop() # Q -> exit app
else:
sys.stderr.write('--- unknown menu character {} --\n'.format(key_description(c)))
def upload_file(self):
"""Ask user for filenname and send its contents"""
sys.stderr.write('\n--- File to upload: ')
sys.stderr.flush()
with self.console:
filename = sys.stdin.readline().rstrip('\r\n')
if filename:
try:
with open(filename, 'rb') as f:
sys.stderr.write('--- Sending file {} ---\n'.format(filename))
while True:
block = f.read(1024)
if not block:
break
self.serial.write(block)
# Wait for output buffer to drain.
self.serial.flush()
sys.stderr.write('.') # Progress indicator.
sys.stderr.write('\n--- File {} sent ---\n'.format(filename))
except IOError as e:
sys.stderr.write('--- ERROR opening file {}: {} ---\n'.format(filename, e))
def change_filter(self):
"""change the i/o transformations"""
sys.stderr.write('\n--- Available Filters:\n')
sys.stderr.write('\n'.join(
'--- {:<10} = {.__doc__}'.format(k, v)
for k, v in sorted(TRANSFORMATIONS.items())))
sys.stderr.write('\n--- Enter new filter name(s) [{}]: '.format(' '.join(self.filters)))
with self.console:
new_filters = sys.stdin.readline().lower().split()
if new_filters:
for f in new_filters:
if f not in TRANSFORMATIONS:
sys.stderr.write('--- unknown filter: {!r}\n'.format(f))
break
else:
self.filters = new_filters
self.update_transformations()
sys.stderr.write('--- filters: {}\n'.format(' '.join(self.filters)))
def change_encoding(self):
"""change encoding on the serial port"""
sys.stderr.write('\n--- Enter new encoding name [{}]: '.format(self.input_encoding))
with self.console:
new_encoding = sys.stdin.readline().strip()
if new_encoding:
try:
codecs.lookup(new_encoding)
except LookupError:
sys.stderr.write('--- invalid encoding name: {}\n'.format(new_encoding))
else:
self.set_rx_encoding(new_encoding)
self.set_tx_encoding(new_encoding)
sys.stderr.write('--- serial input encoding: {}\n'.format(self.input_encoding))
sys.stderr.write('--- serial output encoding: {}\n'.format(self.output_encoding))
def change_baudrate(self):
"""change the baudrate"""
sys.stderr.write('\n--- Baudrate: ')
sys.stderr.flush()
with self.console:
backup = self.serial.baudrate
try:
self.serial.baudrate = int(sys.stdin.readline().strip())
except ValueError as e:
sys.stderr.write('--- ERROR setting baudrate: {} ---\n'.format(e))
self.serial.baudrate = backup
else:
self.dump_port_settings()
def change_port(self):
"""Have a conversation with the user to change the serial port"""
with self.console:
try:
port = ask_for_port()
except KeyboardInterrupt:
port = None
if port and port != self.serial.port:
# reader thread needs to be shut down
self._stop_reader()
# save settings
settings = self.serial.getSettingsDict()
try:
new_serial = serial.serial_for_url(port, do_not_open=True)
# restore settings and open
new_serial.applySettingsDict(settings)
new_serial.rts = self.serial.rts
new_serial.dtr = self.serial.dtr
new_serial.open()
new_serial.break_condition = self.serial.break_condition
except Exception as e:
sys.stderr.write('--- ERROR opening new port: {} ---\n'.format(e))
new_serial.close()
else:
self.serial.close()
self.serial = new_serial
sys.stderr.write('--- Port changed to: {} ---\n'.format(self.serial.port))
# and restart the reader thread
self._start_reader()
def suspend_port(self):
"""\
open port temporarily, allow reconnect, exit and port change to get
out of the loop
"""
# reader thread needs to be shut down
self._stop_reader()
self.serial.close()
sys.stderr.write('\n--- Port closed: {} ---\n'.format(self.serial.port))
do_change_port = False
while not self.serial.is_open:
sys.stderr.write('--- Quit: {exit} | p: port change | any other key to reconnect ---\n'.format(
exit=key_description(self.exit_character)))
k = self.console.getkey()
if k == self.exit_character:
self.stop() # exit app
break
elif k in 'pP':
do_change_port = True
break
try:
self.serial.open()
except Exception as e:
sys.stderr.write('--- ERROR opening port: {} ---\n'.format(e))
if do_change_port:
self.change_port()
else:
# and restart the reader thread
self._start_reader()
sys.stderr.write('--- Port opened: {} ---\n'.format(self.serial.port))
def get_help_text(self):
"""return the help text"""
# help text, starts with blank line!
return """
--- pySerial ({version}) - miniterm - help
---
--- {exit:8} Exit program (alias {menu} Q)
--- {menu:8} Menu escape key, followed by:
--- Menu keys:
--- {menu:7} Send the menu character itself to remote
--- {exit:7} Send the exit character itself to remote
--- {info:7} Show info
--- {upload:7} Upload file (prompt will be shown)
--- {repr:7} encoding
--- {filter:7} edit filters
--- Toggles:
--- {rts:7} RTS {dtr:7} DTR {brk:7} BREAK
--- {echo:7} echo {eol:7} EOL
---
--- Port settings ({menu} followed by the following):
--- p change port
--- 7 8 set data bits
--- N E O S M change parity (None, Even, Odd, Space, Mark)
--- 1 2 3 set stop bits (1, 2, 1.5)
--- b change baud rate
--- x X disable/enable software flow control
--- r R disable/enable hardware flow control
""".format(version=getattr(serial, 'VERSION', 'unknown version'),
exit=key_description(self.exit_character),
menu=key_description(self.menu_character),
rts=key_description('\x12'),
dtr=key_description('\x04'),
brk=key_description('\x02'),
echo=key_description('\x05'),
info=key_description('\x09'),
upload=key_description('\x15'),
repr=key_description('\x01'),
filter=key_description('\x06'),
eol=key_description('\x0c'))
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# default args can be used to override when calling main() from an other script
# e.g to create a miniterm-my-device.py
def main(default_port=None, default_baudrate=9600, default_rts=None, default_dtr=None):
"""Command line tool, entry point"""
import argparse
parser = argparse.ArgumentParser(
description='Miniterm - A simple terminal program for the serial port.')
parser.add_argument(
'port',
nargs='?',
help='serial port name ("-" to show port list)',
default=default_port)
parser.add_argument(
'baudrate',
nargs='?',
type=int,
help='set baud rate, default: %(default)s',
default=default_baudrate)
group = parser.add_argument_group('port settings')
group.add_argument(
'--parity',
choices=['N', 'E', 'O', 'S', 'M'],
type=lambda c: c.upper(),
help='set parity, one of {N E O S M}, default: N',
default='N')
group.add_argument(
'--rtscts',
action='store_true',
help='enable RTS/CTS flow control (default off)',
default=False)
group.add_argument(
'--xonxoff',
action='store_true',
help='enable software flow control (default off)',
default=False)
group.add_argument(
'--rts',
type=int,
help='set initial RTS line state (possible values: 0, 1)',
default=default_rts)
group.add_argument(
'--dtr',
type=int,
help='set initial DTR line state (possible values: 0, 1)',
default=default_dtr)
group.add_argument(
'--non-exclusive',
dest='exclusive',
action='store_false',
help='disable locking for native ports',
default=True)
group.add_argument(
'--ask',
action='store_true',
help='ask again for port when open fails',
default=False)
group = parser.add_argument_group('data handling')
group.add_argument(
'-e', '--echo',
action='store_true',
help='enable local echo (default off)',
default=False)
group.add_argument(
'--encoding',
dest='serial_port_encoding',
metavar='CODEC',
help='set the encoding for the serial port (e.g. hexlify, Latin1, UTF-8), default: %(default)s',
default='UTF-8')
group.add_argument(
'-f', '--filter',
action='append',
metavar='NAME',
help='add text transformation',
default=[])
group.add_argument(
'--eol',
choices=['CR', 'LF', 'CRLF'],
type=lambda c: c.upper(),
help='end of line mode',
default='CRLF')
group.add_argument(
'--raw',
action='store_true',
help='Do no apply any encodings/transformations',
default=False)
group = parser.add_argument_group('hotkeys')
group.add_argument(
'--exit-char',
type=int,
metavar='NUM',
help='Unicode of special character that is used to exit the application, default: %(default)s',
default=0x1d) # GS/CTRL+]
group.add_argument(
'--menu-char',
type=int,
metavar='NUM',
help='Unicode code of special character that is used to control miniterm (menu), default: %(default)s',
default=0x14) # Menu: CTRL+T
group = parser.add_argument_group('diagnostics')
group.add_argument(
'-q', '--quiet',
action='store_true',
help='suppress non-error messages',
default=False)
group.add_argument(
'--develop',
action='store_true',
help='show Python traceback on error',
default=False)
args = parser.parse_args()
if args.menu_char == args.exit_char:
parser.error('--exit-char can not be the same as --menu-char')
if args.filter:
if 'help' in args.filter:
sys.stderr.write('Available filters:\n')
sys.stderr.write('\n'.join(
'{:<10} = {.__doc__}'.format(k, v)
for k, v in sorted(TRANSFORMATIONS.items())))
sys.stderr.write('\n')
sys.exit(1)
filters = args.filter
else:
filters = ['default']
while True:
# no port given on command line -> ask user now
if args.port is None or args.port == '-':
try:
args.port = ask_for_port()
except KeyboardInterrupt:
sys.stderr.write('\n')
parser.error('user aborted and port is not given')
else:
if not args.port:
parser.error('port is not given')
try:
serial_instance = serial.serial_for_url(
args.port,
args.baudrate,
parity=args.parity,
rtscts=args.rtscts,
xonxoff=args.xonxoff,
do_not_open=True)
if not hasattr(serial_instance, 'cancel_read'):
# enable timeout for alive flag polling if cancel_read is not available
serial_instance.timeout = 1
if args.dtr is not None:
if not args.quiet:
sys.stderr.write('--- forcing DTR {}\n'.format('active' if args.dtr else 'inactive'))
serial_instance.dtr = args.dtr
if args.rts is not None:
if not args.quiet:
sys.stderr.write('--- forcing RTS {}\n'.format('active' if args.rts else 'inactive'))
serial_instance.rts = args.rts
if isinstance(serial_instance, serial.Serial):
serial_instance.exclusive = args.exclusive
serial_instance.open()
except serial.SerialException as e:
sys.stderr.write('could not open port {!r}: {}\n'.format(args.port, e))
if args.develop:
raise
if not args.ask:
sys.exit(1)
else:
args.port = '-'
else:
break
miniterm = Miniterm(
serial_instance,
echo=args.echo,
eol=args.eol.lower(),
filters=filters)
miniterm.exit_character = unichr(args.exit_char)
miniterm.menu_character = unichr(args.menu_char)
miniterm.raw = args.raw
miniterm.set_rx_encoding(args.serial_port_encoding)
miniterm.set_tx_encoding(args.serial_port_encoding)
if not args.quiet:
sys.stderr.write('--- Miniterm on {p.name} {p.baudrate},{p.bytesize},{p.parity},{p.stopbits} ---\n'.format(
p=miniterm.serial))
sys.stderr.write('--- Quit: {} | Menu: {} | Help: {} followed by {} ---\n'.format(
key_description(miniterm.exit_character),
key_description(miniterm.menu_character),
key_description(miniterm.menu_character),
key_description('\x08')))
miniterm.start()
try:
miniterm.join(True)
except KeyboardInterrupt:
pass
if not args.quiet:
sys.stderr.write('\n--- exit ---\n')
miniterm.join()
miniterm.close()
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if __name__ == '__main__':
main()
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