from serial import Serial
from operator import xor
from time import sleep
from sys import exit

ser = Serial("/dev/ttyUSB0", 600, 7, 'E', 1)

id1 = 0
id2 = 0
writebit = 1

STX = 2
ETX = 3
EOT = 4
ENQ = 5
dummy = ord('a')

addr = [ord('0') + id1, ord('0') + ((id2 << 1) | writebit), ENQ]

def wrlist(data):
	ser.write("".join(map(chr, data)))
	pass

def sendold(command, verb=False):
	checksum = reduce(xor, command)
	data = addr + [STX] + command + [checksum, EOT]
	if verb:
		print map(hex, data)
		print map(chr, data)
	wrlist(data)
def send(command, verb=False):
	wrlist(addr)
	sleep(200.0/1000)
	checksum = reduce(xor, command)
	data = [STX] + command + [checksum, EOT]
	if verb:
		print map(hex, data)
		print map(chr, data)
	wrlist(data)

seglo =1 #ord("1")
seghi =1 #ord("1")

clearcmd = [seghi, seglo, dummy, dummy, dummy, dummy, dummy, ord('N'), ETX]
parama="sbn"[1]
paramb="lrmz"[1]
textcmd = [seghi, seglo, dummy, dummy, dummy, ord(parama), ord(paramb), ord('T'), ord('H'), ord('e'), ord('l'), ord('l'), ord('o'), ETX]

cmd = textcmd
if False:
	#sendold(clearcmd,verb=True)
	send(clearcmd,verb=True)
	ser.setTimeout(0)
	print list(ser.read(100))
	exit()

#send=sendold

send(cmd, True)
ser.setTimeout(0)
while True:
	sleep(1.0/1000)
	ser.write("".join(map(chr, addr)) + "\x10\x31")
	x=ser.read(1)
	if x != "":
		print "!!!"
		print ord(x)
		print x
	send(cmd)