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#!/usr/bin/env python
#very simple serial terminal
#(C)2002 Chris Liechti >cliecht@gmx.net>
#input characters are sent directly, received characters are displays as is
#baudrate and echo configuartion is done through globals
import sys, os, serial, threading, getopt
#EXITCHARCTER = '\x1b' #ESC
EXITCHARCTER = '\x04' #ctrl+d
#first choosea platform dependant way to read single characters from the console
if os.name == 'nt':
import msvcrt
def getkey():
while 1:
if echo:
z = msvcrt.getche()
else:
z = msvcrt.getch()
if z == '\0' or z == '\xe0': #functions keys
msvcrt.getch()
else:
return z
elif os.name == 'posix':
#XXX: Untested code drrived from the Python FAQ....
import termios, 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)
if echo: sys.stdout.write(c)
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
def reader():
"""loop forever and copy serial->console"""
while 1:
sys.stdout.write(s.read())
def writer():
"""loop and copy console->serial until EOF character is found"""
while 1:
c = getkey()
if c == EXITCHARCTER: break #exit on esc
s.write(c) #send character
if convert_outgoing_cr and c == '\r':
s.write('\n')
if echo: sys.stdout.write('\n')
#print a short help message
def usage():
print >>sys.stderr, """USAGE: %s [options]
Simple Terminal Programm for the serial port.
options:
-p, --port=PORT: port, a number, defualt = 0 or a device name
-b, --baud=BAUD: baudrate, default 9600
-r, --rtscts: enable RTS/CTS flow control (default off)
-x, --xonxoff: enable software flow control (default off)
-e, --echo: enable local echo (default off)
-c, --cr: disable CR -> CR+LF translation
""" % sys.argv[0]
if __name__ == '__main__':
#parse command line options
try:
opts, args = getopt.getopt(sys.argv[1:],
"hp:b:rxec",
["help", "port=", "baud=", "rtscts", "xonxoff", "echo", "cr"])
except getopt.GetoptError:
# print help information and exit:
usage()
sys.exit(2)
port = 0
baudrate = 9600
echo = 0
convert_outgoing_cr = 1
rtscts = 0
xonxoff = 0
for o, a in opts:
if o in ("-h", "--help"): #help text
usage()
sys.exit()
elif o in ("-p", "--port"): #specified port
try:
port = int(a)
except ValueError:
port = a
elif o in ("-b", "--baud"): #specified baudrate
try:
baudrate = int(a)
except ValueError:
raise ValueError, "Baudrate must be a integer number"
elif o in ("-r", "--rtscts"):
rtscts = 1
elif o in ("-x", "--xonxoff"):
xonxoff = 1
elif o in ("-e", "--echo"):
echo = 1
elif o in ("-c", "--cr"):
convert_outgoing_cr = 0
try:
s = serial.Serial(port, baudrate, rtscts=rtscts, xonxoff=xonxoff)
except:
print "could not open port"
sys.exit(1)
print "--- Miniterm --- type Ctrl-D to quit"
#start serial->console thread
r = threading.Thread(target=reader)
r.setDaemon(1)
r.start()
#enter console->serial loop
writer()
print "\n--- exit ---"
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