import os
import mmap
import serial

inputMapping = 0
outputMapping = 0

inputFile = file ( "inputs.txt" , "r+" )
size = os.path.getsize ( "inputs.txt" )

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

data = mmap.mmap ( inputFile.fileno() , size )
outputData = mmap.mmap ( outputFile.fileno() , outSize )

port = serial.Serial ( "/dev/ttyUSB0" , 9600 , timeout=0 , parity=serial.PARITY_EVEN )
print port.portstr
port.write ( chr ( 1 ) )
port.write ( " Relay Control                 Terminal" )

number = ""
mode = ""

class relays:
   display = ""
   oldDisplay = ""

   def __init__ ( self , port ):
      self.mode = ""
      self.port = port
      self.numberString = ""
      self.number = 0
      self.inputMessage = ""
      self.outputMessage = ""
      self.numbers = dict()
      self.numbers [ "INPUT" ] = 0
      self.numbers [ "OUTPUT" ] = 0
      self.watchInputHigh = False
      self.watchInputLow = False
      self.watchOutputHigh = False
      self.watchOutputLow = False

   def status ( self , inputs , outputs ):
      self.inputs = inputs
      self.outputs = outputs

   def processKeypad ( self ):
      fromSerial = self.port.read ( 1 )
      if fromSerial != "":
         if fromSerial == 'T':
            self.mode = "INPUT"
            self.clearNumberInput()
         elif fromSerial == 'U':
            self.mode = "OUTPUT"
            self.clearNumberInput()
         elif fromSerial == 'V':
            self.high()
         elif fromSerial == 'W':
            self.low()
         elif ord ( fromSerial ) >= 
d ord ( fromSerial ) <= 57:
            self.numberString += fromSerial
            self.numbers [ self.mode ] = 
 self.numberString )
            if self.mode == "INPUT":
               self.watchInputHigh = False
               self.watchInputLow = False
            if self.mode == "OUTPUT":
               self.watchOutputHigh = False
               self.watchOutputLow = False

      self.updateDisplay()

   def high ( self ):
      if self.mode == "INPUT":
         self.inputs [ self.numbers [ "INPUT" ] ] = '1'
         self.inputMessage = "SET"
         self.watchInputHigh = True
         self.watchInputLow = False
      if self.mode == "OUTPUT":
         self.outputs [ self.numbers [ "OUTPUT" ] ] = '1'
         self.outputMessage = "SET"
         self.watchOutputHigh = True
         self.watchOutputLow = False
   def low ( self ):
      if self.mode == "INPUT":
         self.inputs [ self.numbers [ "INPUT" ] ] = '0'
         self.inputMessage = "CLEAR"
         self.watchInputLow = True
         self.watchInputHigh = False
      if self.mode == "OUTPUT":
         self.outputs [ self.numbers [ "OUTPUT" ] ] = '0'
         self.outputMessage = "CLEAR"
         self.watchOutputLow = True
         self.watchOutputHigh = False

   def watch ( self ):
      if self.watchInputHigh == True and self.inputs [ self.numbers [ "INPUT" ] ] == '0':
         self.inputMessage = ""
      if self.watchInputLow == True and self.inputs [ self.numbers [ "INPUT" ] ] == '1':
         self.inputMessage = ""
      if self.watchOutputHigh == True and self.outputs [ self.numbers [ "OUTPUT" ] ] == '0':
         self.outputMessage = ""
      if self.watchOutputLow == True and self.outputs [ self.numbers [ "OUTPUT" ] ] == '1':
         self.outputMessage = ""

   def clearNumberInput ( self ):
      self.numberString = "";
   def updateDisplay ( self ):
      self.watch()
      if self.mode == "INPUT" or self.mode == "OUTPUT":
         self.display = " INPUT  %2.2d: %1.1s %7.7s" % ( self.numbers [ "INPUT" ] , self.inputs [ self.numbers [ "INPUT" ] ] , 
inputMessage )
         self.display += "                    "
         self.display += "OUTPUT %2.2d: %1.1s %7.7s" % ( self.numbers [ "OUTPUT" ] , self.outputs [ self.numbers [ "OUTPUT" ] ] , 
outputMessage )

      # update the display if its changed
      if self.display != self.oldDisplay:
         self.port.write ( chr ( 1 ) + self.display )
         self.oldDisplay = self.display

dispatch = relays ( port )

while ( 1 ):
   dispatch.status ( data , outputData )
   dispatch.processKeypad()