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DexOperator.py
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DexOperator.py
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import dexcrc16
import serial
from time import sleep
SOH = chr(0x01)
STX = chr(0x02)
ETX = chr(0x03)
EOT = chr(0x04)
DLE = chr(0x10)
ENQ = chr(0x05)
NAK = chr(0x15)
ETB = chr(0x17)
ACK0 = '0'
ACK1 = '1'
BLOCK_SIZE = 245
def printReceivedData(data):
#print "Received data:",data,"=",data.encode('hex')
return True
def chunkstring(string, length):
return (string[0+i:length+i] for i in range(0, len(string), length))
def printLog(content):
print (content)
class MasterReader:
def __init__(self, serialPath, communicationID):
self.serialPath = serialPath
self.communicationID = communicationID
self.ser = serial.Serial(self.serialPath, 9600, timeout=0.01)
self.content = ""
def read(self):
handshaker = Handshaker(self.ser, self.communicationID)
firstHandshakeDCMasterResult = handshaker.firstHandshakeDCMaster()
if firstHandshakeDCMasterResult == False:
return False
secondHandshakeVMDMasterResult = handshaker.secondHandshakeVMDMaster()
if secondHandshakeVMDMasterResult == False:
return False
self.content = handshaker.VMD2DCExchange()
self.ser.close()
return self.content
# class SlaveReader:
class MasterWriter:
def __init__(self, serialPath, communicationID):
self.serialPath = serialPath
self.communicationID = communicationID
self.ser = serial.Serial(self.serialPath, 9600, timeout=0.01)
def write(self, content):
handshaker = Handshaker(self.ser, self.communicationID)
dataExchanger = DataExchanger(self.ser)
firstHandshakeDCMasterResult = handshaker.firstHandshakeDCMaster()
if firstHandshakeDCMasterResult == False:
return False
secondHandshakeVMDMasterResult = handshaker.secondHandshakeVMDMaster()
if secondHandshakeVMDMasterResult == False:
return False
dataExchanger.DC2VMDExchange(content)
self.ser.close()
return True
class Handshaker:
def __init__(self, ser, communicationID):
self.ser = ser
self.communicationID = communicationID
self.content = ""
def firstHandshakeDCMaster(self):
print "Entering First Handshake DC as Master"
state = 0
retries = 5
self.ser.flushInput()
self.ser.write(ENQ)
self.ser.flush()
while retries > 0:
x = self.ser.read()
if len(x) > 0:
printReceivedData(x)
retries = 5
if state == 0:
print "State 0: Expecting DLE"
if x == DLE:
print "Got DLE"
state = 1
elif x == ENQ:
print "Got ENQ. TODO: slave handshake"
# start slaveHandshake
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
else:
print "Got something else. Sending ENQ to restart master handshake"
sleep(0.01)
self.ser.write(ENQ)
self.ser.flush()
elif state == 1:
print "State 1: Expecting '0'"
if x == '0':
print "Got second half of DLE"
print "Sending DLE"
sleep(0.01)
self.ser.write(DLE)
#print "Sending SOH"
self.ser.write(SOH)
# print "Sending communication ID"
for char in self.communicationID:
self.ser.write(char)
#print "Sending DLE"
self.ser.write(DLE)
#print "Sending ETX"
self.ser.write(ETX)
print self.communicationID
crc = dexcrc16.crcStr(self.communicationID + ETX)
print crc
self.ser.write(chr(crc & 0xFF))
self.ser.write(chr(crc >> 8))
self.ser.flush()
sleep(0.2)
state = 2
else:
#print "Something Wrong. Sending ENQ to restart master handshake"
sleep(0.01)
self.ser.write(ENQ)
self.ser.flush()
state = 0
elif state == 2:
print "State 2: Expecting DLE"
if x == DLE:
print "Got DLE"
state = 3
else:
print "Got something other than DLE. Bad"
print "Received data:",x,"=",x.encode('hex')
return False
elif state == 3:
print "State 3: Expecting '1' or '0'"
if x == '1' or x == '0':
print "Got second half of DLE. Sending EOT"
sleep(0.01)
self.ser.write(EOT)
self.ser.flush()
print "First Handshake DC as Master completed"
return True
else:
#print "Got something wrong. Sending NAK"
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
state = 0
else:
retries = retries - 1
print "***** trying again *****"
print "First Handshake DC as Master gave up"
return False
def secondHandshakeVMDMaster(self):
#print "Entering Second Handshake VMD as Master"
self.ser.flushInput()
state = 0
retries = 5
receivedData = ""
while retries > 0:
x = self.ser.read()
if len(x) > 0:
printReceivedData(x)
retries = 5
if state == 0:
#print "State 0: Waiting for Command"
if x == ENQ:
#print "Got ENQ. Replying with DLE '0'"
sleep(0.01)
self.ser.write(DLE)
self.ser.write('0')
self.ser.flush()
elif x == EOT:
#print "Second Handshake VMD as Master Completed"
return True
elif x == DLE:
#print "Got DLE. Receiving data now"
state = 1
elif state == 1:
#print "State 1: Expecting SOH"
if x == SOH:
#print "Got SOH"
receivedData = ""
state = 2
elif state == 2:
#print "State 2: Receiving data"
if x == DLE:
#print "Got DLE. End of Data"
state = 3
else:
receivedData += x
elif state == 3:
#print "State 3: Expecting ETX"
if x == ETX:
#print "Got ETX"
receivedData += x
state = 4
else:
#print "Got Something else. Resetting"
state = 0
elif state == 4:
#print "State 4: Receiving first CRC byte"
receivedData += x
state = 5
elif state == 5:
#print "State 5: Receiving second CRC byte"
receivedData += x
crc = dexcrc16.crcStr(receivedData)
#print "Calculated crc=",crc
if crc == 0:
#print "CRC is good. Sending DLE,1"
sleep(0.01)
self.ser.write(DLE)
self.ser.write('1')
self.ser.flush()
else:
#print "CRC failed. Sending NAK"
self.ser.write(NAK)
self.ser.flush()
state = 0
else:
retries = retries - 1
sleep(0.01)
#print "trying again"
#print "Second Handshake VMD as Master Gave up"
return False
def VMD2DCExchange(self):
#print "Exchanging data VMD to DC"
receivedData = ""
block = ""
state = 0
retries = 500
currentAck = ACK0
self.ser.flushInput()
while retries > 0:
x = self.ser.read()
printReceivedData(x)
if len(x) > 0:
retries = 500
if state == 0:
#print "State 0: Expecting ENQ"
if x == ENQ:
#print "Got ENQ. Replying ACK"
sleep(0.01)
self.ser.write(DLE)
self.ser.write(currentAck)
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
elif x == DLE:
#print "Got DLE. Start of block"
state = 1
elif state == 1:
#print "State 1: Expecting STX"
if x == STX:
#print "Got STX. Start block receiving"
state = 2
receivedData = ""
block = ""
elif state == 2:
#print "State 2: Receiving data block"
if x == DLE:
#print "Got DLE. end of data"
state = 3
else:
receivedData += x
block += x
elif state == 3:
#print "State 3: waiting for end of block"
if x == ETB:
#print "Got ETB, end of current block"
receivedData += x
state = 4
elif x == ETX:
#print "Got ETX, end of last block"
receivedData += x
state = 6
else:
#print "Got something other than end of block"
self.ser.write(NAK)
state = 0
elif state == 4:
#print "State 4 - Waiting for first half of CRC"
receivedData += x
state = 5
elif state == 5:
#print "State 5 - Waiting for second half of CRC"
receivedData += x
crc = dexcrc16.crcStr(receivedData)
#print "Got all data, crc=",crc
if crc == 0:
#print "CRC is good"
self.content += block
sleep(0.01)
self.ser.write(DLE)
self.ser.write(currentAck)
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
state = 0
else:
#print "CRC failed"
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
state = 0
elif state == 6:
#print "State 6 - Waiting for first half of CRC"
receivedData += x
state = 7
elif state == 7:
#print "State 7 - Waiting for second half of CRC"
receivedData += x
crc = dexcrc16.crcStr(receivedData)
#print "Got all data, crc=",crc
if crc == 0:
#print "CRC is good"
self.content += block
self.ser.write(DLE)
self.ser.write(currentAck)
state = 8
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
else:
#print "CRC failed"
self.ser.write(NAK)
state = 0
elif state == 8:
#print "State 8 - waiting for EOT"
if x == EOT:
#print "Got EOT, End of data exchange"
return self.content
else:
#print "Got something else."
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
state = 0
else:
retries = retries - 1
sleep(0.1)
#print "trying again"
#print "Exchanging data VMD to DC Gave Up"
return False
class DataExchanger:
def __init__(self, ser):
self.ser = ser
self.content = ""
def VMD2DCExchange(self):
#print "Exchanging data VMD to DC"
receivedData = ""
block = ""
state = 0
retries = 5
currentAck = ACK0
self.ser.flushInput()
while retries > 0:
x = self.ser.read()
printReceivedData(x)
if len(x) > 0:
retries = 5
if state == 0:
#print "State 0: Expecting ENQ"
if x == ENQ:
#print "Got ENQ. Replying ACK"
sleep(0.01)
self.ser.write(DLE)
self.ser.write(currentAck)
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
elif x == DLE:
#print "Got DLE. Start of block"
state = 1
elif state == 1:
#print "State 1: Expecting STX"
if x == STX:
#print "Got STX. Start block receiving"
state = 2
receivedData = ""
block = ""
elif state == 2:
#print "State 2: Receiving data block"
if x == DLE:
#print "Got DLE. end of data"
state = 3
else:
receivedData += x
block += x
elif state == 3:
#print "State 3: waiting for end of block"
if x == ETB:
#print "Got ETB, end of current block"
receivedData += x
state = 4
elif x == ETX:
#print "Got ETX, end of last block"
receivedData += x
state = 6
else:
#print "Got something other than end of block"
self.ser.write(NAK)
state = 0
elif state == 4:
#print "State 4 - Waiting for first half of CRC"
receivedData += x
state = 5
elif state == 5:
#print "State 5 - Waiting for second half of CRC"
receivedData += x
crc = dexcrc16.crcStr(receivedData)
#print "Got all data, crc=",crc
if crc == 0:
#print "CRC is good"
self.content += block
sleep(0.01)
self.ser.write(DLE)
self.ser.write(currentAck)
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
state = 0
else:
#print "CRC failed"
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
state = 0
elif state == 6:
#print "State 6 - Waiting for first half of CRC"
receivedData += x
state = 7
elif state == 7:
#print "State 7 - Waiting for second half of CRC"
receivedData += x
crc = dexcrc16.crcStr(receivedData)
#print "Got all data, crc=",crc
if crc == 0:
#print "CRC is good"
self.content += block
self.ser.write(DLE)
self.ser.write(currentAck)
state = 8
self.ser.flush()
if currentAck == ACK0:
currentAck = ACK1
elif currentAck == ACK1:
currentAck = ACK0
else:
#print "CRC failed"
self.ser.write(NAK)
state = 0
elif state == 8:
#print "State 8 - waiting for EOT"
if x == EOT:
#print "Got EOT, End of data exchange"
return self.content
else:
#print "Got something else."
sleep(0.01)
self.ser.write(NAK)
self.ser.flush()
state = 0
else:
retries = retries - 1
sleep(0.01)
#print "trying again"
#print "Exchanging data VMD to DC Gave Up"
return False
def DC2VMDExchange(self, content):
print "Exchanging data DC to VMD"
blocks = chunkstring(content, BLOCK_SIZE)
blockIterator = -1
state = 0
retries = 5
self.ser.flushInput()
self.ser.write(ENQ)
self.ser.flush()
while retries > 0:
x = self.ser.read()
if len(x) > 0 or state == 2 or state == 3:
printReceivedData(x)
retries = 5
if state == 0:
print "State 0: Expecting DLE"
if x == DLE:
print "Got DLE"
state = 1
else:
print "Got something else. Sending ENQ to restart data exchange"
sleep(0.01)
self.ser.write(ENQ)
self.ser.flush()
elif state == 1:
print "State 1: Expecting second half of DLE"
if x == '0' or x == '1':
if blockIterator == len(blocks) - 1:
#print "Reached end of content"
sleep(0.01)
self.ser.write(EOT)
self.ser.flush()
print "Data exchange DC to VMD completed"
return True
else:
print "Got second half of DLE. Sending next block"
blockIterator += 1
else:
print "Got something else. Resending block"
sleep(0.01)
self.ser.write(DLE)
self.ser.write(STX)
for char in blocks[blockIterator]:
self.ser.write(char)
if blockIterator < (len(blocks) - 1):
state == 2
elif blockIterator == (len(blocks) - 1):
state == 3
elif state == 2:
print "State 2: Sending block end"
self.ser.write(DLE)
self.ser.write(ETB)
crc = dexcrc16.crcStr(blocks[blockIterator] + ETB)
self.ser.write(chr(crc & 0xFF))
self.ser.write(chr(crc >> 8))
self.flush()
state = 0
elif state == 3:
print "State 3: Sending content end"
self.ser.write(DLE)
self.ser.write(ETX)
crc = dexcrc16.crcStr(blocks[blockIterator] + ETX)
self.ser.write(chr(crc & 0xFF))
self.ser.write(chr(crc >> 8))
self.flush()
state = 0
else:
retries = retries - 1
sleep(0.01)
print "tring again"
print "Exchanging data DC to VMD Gave Up"
return False