#!/usr/bin/env python
import time
import serial
import sys, tty, termios

class _Getch:
    """Gets a single character from standard input.  Does not echo to the screen."""
    def __init__(self):
        try:
            self.impl = _GetchWindows()
        except ImportError:
            self.impl = _GetchUnix()

    def __call__(self): return self.impl()


class _GetchUnix:
    def __init__(self):
        import tty, sys

    def __call__(self):
        import sys, tty, termios
        fd = sys.stdin.fileno()
        old_settings = termios.tcgetattr(fd)
        try:
            tty.setraw(sys.stdin.fileno())
            ch = sys.stdin.read(1)
        finally:
            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
        return ch


class _GetchWindows:
    def __init__(self):
        import msvcrt

    def __call__(self):
        import msvcrt
        return msvcrt.getch()

def getChar() :
	fd = sys.stdin.fileno()
	old_settings = termios.tcgetattr(fd)
	try:
		tty.setraw(sys.stdin.fileno())
        	ch = sys.stdin.read(1)
	finally:
		termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
        return ch


ser = serial.Serial(
	port='/dev/ttyACM2',
        baudrate = 9600,
        parity=serial.PARITY_NONE,
        stopbits=serial.STOPBITS_ONE,
        bytesize=serial.EIGHTBITS,
        timeout=1)
counter=0
#while 1:
	#getch = _Getch()
	#/*ser.write('Write counter: %d \n'%(counter))*/
	#ser.write(getch)
#	data=bytes([0x0c,0x80,0x09,0x00,0xf0,0xce,0x61,0x9d,0x01,0x00,0x01,0x00,0x00,0x00]) 
#	ser.write(data) 
#        time.sleep(1)
#        counter += 1
while 1 :
	# get keyboard input
	#input = raw_input(">> ")
	input = getChar()
        # Python 3 users
        # input = input(">> ")
	if input == 'o':
		ser.close()
		exit()
	else:
		# send the character to the device
		# (note that I happend a \r\n carriage return and line feed to the characters - this is requested by my device)
		ser.write(input + '\r\n')
		out = ''
		# let's wait one second before reading output (let's give device time to answer)
		time.sleep(0.2)
		while ser.inWaiting() > 0:
			out += ser.read(1)
			
		if out != '':
			print ">>" + out