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SerialComms.py
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161 lines (150 loc) · 5.36 KB
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##
## Message Format
## Byte 0: Start Character - PROTOCOL_STX = 0xFE
## Byte 1: Message Length = Message Type + Size of Message
## Byte 2: Message Type
## Byte 3-n: Message Data.
##
import serial
import struct
import time
PROTOCOL_STX = 0xFE
WAITING_FOR_STX = 0
WAITING_FOR_LENGTH = 1
WAITING_FOR_MSGTYPE = 2
WAITING_FOR_MESSAGE = 3
class SerialComms:
def __init__(self,verbose=0):
"""
Typical Usage:
msg = SerialComms()
msg = SerialComms(1) <- Shows Error/Status Messages
"""
self._state = WAITING_FOR_STX
self.msg_length = 0
self.msg_type = 0
self.message = []
self._msg_count = 0
self.verbose = verbose
def _debug(self,message):
"""
If the class is initialised with the verbose flag to
1, then this class with print status messages.
"""
if self.verbose:
print message
def process(self,c):
"""
Populates a message from a datastream.
@Reads: A single character from a datastream
@Returns: True, if a complete message has been recieved.
False, if a complete message hasn't been recieved yet.
Completed Message contained within self.message
"""
if self._state == WAITING_FOR_STX:
if ord(c) == PROTOCOL_STX:
self._debug("Start Recieved")
self._state=WAITING_FOR_LENGTH
self._msg_count = 0
self.message = []
elif self._state == WAITING_FOR_LENGTH:
self._debug("Reading Length")
self.msg_length = ord(c)
self._debug("Length: "+str(self.msg_length))
self._state = WAITING_FOR_MSGTYPE
elif self._state == WAITING_FOR_MSGTYPE:
self._debug("Reading Msg Type")
self.msg_type = ord(c)
self._state = WAITING_FOR_MESSAGE
elif self._state == WAITING_FOR_MESSAGE:
#if self.msg_length - 1 == 0:
# return True
#if not (self._msg_count > self.msg_length - 1):
# self.message.append(ord(c))
# self._msg_count += 1
# if self._msg_count == self.msg_length-1:
# self._debug("Message Complete")
# self._state = WAITING_FOR_STX
# return True
if (self._msg_count < self.msg_length):
self.message.append(ord(c))
self._msg_count += 1
return False
if (self._msg_count == self.msg_length):
self._debug("Message Complete")
self._state = WAITING_FOR_STX
return True
else:
self._state=WAITING_FOR_STX
return False
def hexdump(src, length=16):
result = []
digits = 4 if isinstance(src, unicode) else 2
for i in xrange(0, len(src), length):
s = src[i:i+length]
hexa = b' '.join(["%0*X" % (digits, ord(x)) for x in s])
text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s])
result.append( b"%04X %-*s %s" % (i, length*(digits + 1), hexa, text) )
return b'\n'.join(result)
if __name__ == "__main__":
recieved = ""
port = serial.Serial("/dev/ttyUSB0",9600,timeout=1)
time.sleep(3)
bus = SerialComms()
quit = False
while (not quit):
command = raw_input(">").lower()
if command == "on":
port.write(struct.pack('BBBBB', 0xFE,2,1,2,1))
elif command == "off":
port.write(struct.pack('BBBBB', 0xFE,2,1,2,0))
elif command == "ping":
port.write(struct.pack('BBBB', 0xFE,1,255,1))
elif command == "quit":
quit = True
while (port.inWaiting()>0):
c = port.read(1)
bus.process(c)
# #print hexdump(c)
if ord(c) == 0xFE:
print hexdump(recieved)
recieved = ""
recieved += c
else:
recieved += c
#port.write(struct.pack('BBBBB', 0xFE,2,1,0,1))
#time.sleep(1)
#port.write(struct.pack('BBBBB', 0xFE,2,1,0,0))
#time.sleep(1)
#port.write(struct.pack('BBBBB', 0xFE,2,1,0,1))
#time.sleep(1)
#port.write(struct.pack('BBBBB', 0xFE,2,1,0,0))
#port.write(struct.pack('BBBB', 0xFE,1,1,9))
#port.write(struct.pack('BBBBB',0xFE,2,2,3,1))
#port.write(struct.pack('BBBBB',0xFE,2,2,2,0))
#port.write(struct.pack('BBBBB',0xFE,2,2,5,0))
#port.write(struct.pack('BBB', 0xFE,0,3))
#port.write(struct.pack('BBBB', 0xFE,1,1,8))
#port.write(struct.pack('BBBB', 0xFE,1,1,3))
#time.sleep(0.5)
#while(port.inWaiting()>0):
#print hexdump(recieved)
#print hexdump(port.read())
#if (bus.process(port.read(1))):
#if bus.msg_type == 1:
#print "IR Send Request Recieved",
#print bus.message
#if bus.msg_type == 2:
#print "Set SSPC Request Recieved",
### print bus.message
#if bus.message[0] < 4 and bus.message[1] < 2:
#print "Setting SSPC %i to" % (bus.message[0]),
#if bus.message[1] == 1:
#print "On"
#else:
#print "Off"
#else:
#print "Invalid SSPC Set Request"
#if bus.msg_type == 3:
#print "SSPC Status Request Recieved"
port.close()