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#!/usr/bin/env python
# Very simple serial terminal
# (C)2002-2004 Chris Liechti <cliechti@gmx.net>
# Input characters are sent directly (only LF -> CR/LF/CRLF translation is
# done), received characters are displayed as is (or as trough pythons
# repr, useful for debug purposes)
# Baudrate and echo configuartion is done through globals
import sys, os, serial, threading, getopt
EXITCHARCTER = '\x1d' #GS/ctrl+]
#first choose a platform dependant way to read single characters from the console
if os.name == 'nt':
import msvcrt
def getkey():
while 1:
z = msvcrt.getch()
if z == '\0' or z == '\xe0': #functions keys
msvcrt.getch()
else:
if z == '\r':
return '\n'
return z
elif os.name == 'posix':
import termios, sys, os
fd = sys.stdin.fileno()
old = termios.tcgetattr(fd)
new = termios.tcgetattr(fd)
new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
new[6][termios.VMIN] = 1
new[6][termios.VTIME] = 0
termios.tcsetattr(fd, termios.TCSANOW, new)
s = '' # We'll save the characters typed and add them to the pool.
def getkey():
c = os.read(fd, 1)
return c
def clenaup_console():
termios.tcsetattr(fd, termios.TCSAFLUSH, old)
sys.exitfunc = clenaup_console #terminal modes have to be restored on exit...
else:
raise "Sorry no implementation for your platform (%s) available." % sys.platform
CONVERT_CRLF = 2
CONVERT_CR = 1
CONVERT_LF = 0
class Miniterm:
def __init__(self, port, baudrate, parity, rtscts, xonxoff, echo=False, convert_outgoing=CONVERT_CRLF, repr_mode=False):
self.serial = serial.Serial(port, baudrate, parity=parity, rtscts=rtscts, xonxoff=xonxoff, timeout=1)
self.echo = echo
self.repr_mode = repr_mode
self.convert_outgoing = convert_outgoing
def start(self):
self.alive = True
#start serial->console thread
self.receiver_thread = threading.Thread(target=self.reader)
self.receiver_thread.setDaemon(1)
self.receiver_thread.start()
#enter console->serial loop
self.transmitter_thread = threading.Thread(target=self.writer)
self.transmitter_thread.setDaemon(1)
self.transmitter_thread.start()
def stop(self):
self.alive = False
def join(self):
self.transmitter_thread.join()
#~ self.receiver_thread.join()
def reader(self):
"""loop and copy serial->console"""
while self.alive:
data = self.serial.read(1)
if self.repr_mode:
sys.stdout.write(repr(data)[1:-1])
else:
sys.stdout.write(data)
sys.stdout.flush()
def writer(self):
"""loop and copy console->serial until EXITCHARCTER character is found"""
while self.alive:
try:
c = getkey()
except KeyboardInterrupt:
c = '\x03'
if c == EXITCHARCTER:
self.stop()
break #exit app
elif c == '\n':
if self.convert_outgoing == CONVERT_CRLF:
self.serial.write('\r\n') #make it a CR+LF
if self.echo:
sys.stdout.write('\r\n')
elif self.convert_outgoing == CONVERT_CR:
self.serial.write('\r') #make it a CR
if self.echo:
sys.stdout.write('\r')
elif self.convert_outgoing == CONVERT_LF:
self.serial.write('\n') #make it a LF
if self.echo:
sys.stdout.write('\n')
else:
self.serial.write(c) #send character
if self.echo:
sys.stdout.write(c)
def main():
import optparse
parser = optparse.OptionParser(usage="""\
%prog [options]
Miniterm - A simple terminal program for the serial port.""")
parser.add_option("-p", "--port", dest="port",
help="port, a number, defualt = 0 or a device name", default=0)
parser.add_option("-b", "--baud", dest="baudrate", action="store", type='int',
help="set baudrate, default=9600", default=9600)
parser.add_option("", "--parity", dest="parity", action="store",
help="set parity, one of [N, E, O], default=N", default='N')
parser.add_option("", "--rtscts", dest="rtscts", action="store_true",
help="enable RTS/CTS flow control (default off)", default=False)
parser.add_option("", "--xonxoff", dest="xonxoff", action="store_true",
help="enable software flow control (default off)", default=False)
parser.add_option("-e", "--echo", dest="echo", action="store_true",
help="enable local echo (default off)", default=False)
parser.add_option("", "--cr", dest="crlf", action="store_true",
help="do not send CR+LF, send CR only", default=False)
parser.add_option("", "--newline", dest="newline", action="store_true",
help="do not send CR+LF, send LF only", default=False)
parser.add_option("-D", "--debug", dest="repr_mode", action="store_true",
help="debug received data (escape nonprintable chars)", default=False)
(options, args) = parser.parse_args()
if options.crlf and options.newline:
parser.error("ony one of --cr or --newline can be specified")
convert_outgoing = CONVERT_CRLF
if options.crlf:
convert_outgoing = CONVERT_CR
elif options.newline:
convert_outgoing = CONVERT_LF
try:
miniterm = Miniterm(
options.port,
options.baudrate,
options.parity,
rtscts=options.rtscts,
xonxoff=options.xonxoff,
echo=options.echo,
convert_outgoing=convert_outgoing,
repr_mode=options.repr_mode,
)
except serial.SerialException:
print "could not open port %r" % options.port
sys.exit(1)
sys.stderr.write("--- Miniterm --- type Ctrl-] to quit\n")
miniterm.start()
miniterm.join()
sys.stderr.write("\n--- exit ---\n")
if __name__ == '__main__':
main()
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