import os
import mmap
import serial
import time
import string

def relayMessage ( data ):
   global port

   message = chr ( 1 )
   message += "D"
   message += "000"
   message += chr ( 2 )
   message += data
   message += chr ( 23 )
   message += chr ( 3 )

   for i in range ( len ( message ) ):
      port.write ( message [ i ] )
      time.sleep ( 0.001 )

   port.flush()

def buildMessage ( data ):
   global outputMapping
   global oldMessage

   message = ""
   for i in range ( outputMapping , outputMapping + 80 , 4 ):
      block = data [ i : i + 4 ]
      if block == "0000":
         message += "0"
      elif block == "1000":
         message += "1"
      elif block == "0100":
         message += "2"
      elif block == "1100":
         message += "3"
      elif block == "0010":
         message += "4"
      elif block == "1010":
         message += "5"
      elif block == "0110":
         message += "6"
      elif block == "1110":
         message += "7"
      elif block == "0001":
         message += "8"
      elif block == "1001":
         message += "9"
      elif block == "0101":
         message += ":"
      elif block == "1101":
         message += ";"
      elif block == "0011":
         message += "<"
      elif block == "1011":
         message += "="
      elif block == "0111":
         message += ">"
      elif block == "1111":
         message += "?"

   message += "????"
   if oldMessage != message:
      relayMessage ( message )
      oldMessage = message

oldMessage = ""
outputMapping = 1

outputFile = file ( "outputs.txt" , "r+" )
outSize = os.path.getsize ( "outputs.txt" )

outputData = mmap.mmap ( outputFile.fileno() , outSize )

port = serial.Serial ( "/dev/ttyS0" , 19200 , timeout=2 , parity=serial.PARITY_EVEN )

print port.portstr

while 1:
   buildMessage ( outputData )
   time.sleep ( 0.05 )