import serial

import exceptions

from threading import Lock

import time

class LPCProtoError(exceptions.Exception):

"""Exception class"""

def __init__(self, msg):

self.msg = msg

def __str__(self):

return "Exception in PLC protocol : " + str(self.msg)

class LPCProto:

def __init__(self, port, rate, timeout):

# serialize access lock

if False:

# Debugging serial stuff

self._serialPort = serial.Serial( port, rate, timeout = timeout, writeTimeout = timeout )

class myser:

def readline(self_):

res = self._serialPort.readline()

print('Recv :"', res, '"')

return res

def read(self_,cnt):

res = self._serialPort.read(cnt)

if len(res) > 16:

print("Recv :", list(map(hex,list(map(ord,res[:16])))), "[...]")

else:

print("Recv :", list(map(hex,list(map(ord,res)))))

return res

def write(self_, string):

lstr=len(string)

if lstr > 16:

print("Send :", list(map(hex,list(map(ord,string[:16])))), "[...]")

else:

print("Send :", list(map(hex,list(map(ord,string)))))

return self._serialPort.write(string)

# while len(string)>0:

# i = self._serialPort.write(string[:4096])

# print ".",

# string = string[i:]

# print

#return lstr

def flush(self_):

return self._serialPort.flush()

def close(self_):

self._serialPort.close()

self.serialPort = myser()

else:

# open serial port

self.serialPort = serial.Serial( port, rate, timeout = timeout )

# start with empty buffer

self.serialPort.flush()

def __del__(self):

if self.serialPort:

self.serialPort.close()

def close(self):

self.serialPort.close()

self.serialPort = None