Make the Notebook Adapter emulator work + add package parsing

Don't know why I had committed a broken version. This one runs,
and also parses packet length when in text mode, to add appropriate
newlines.

timex_notebook_adapter.py

@@ -19,7 +19,7 @@ at the beginning of transmission to make sure the device is reset.
 """
 
 
-if len(sys.argv) != 3 and len(sys.argv) != 4:
+if len(sys.argv) not in [3,4]:
 	print("Usage: {} <port> <log file> [bin|txt]".format(sys.argv[0]))
 	sys.exit(-1)
 
@@ -29,9 +29,13 @@ logFileName = sys.argv[2]
 logText = False
 
 if len(sys.argv) == 4:
-	if sys.argv[4] == txt:
+	if sys.argv[3] == "txt":
 		logText = True
 
+# Used for rudimentary packet parsing
+pastSync = 0
+packetLeft = 0
+
 with serial.Serial(serialPort, 9600, timeout=0.1) as sp:
 
 	# Used to control state of device
@@ -44,6 +48,7 @@ with serial.Serial(serialPort, 9600, timeout=0.1) as sp:
 	while True:
 		while True:
 			# CTS control line is used for powering device, and therefore also reset it
+			# Inactivated due to not available on all USB-Serial converters
 			if False and sp.cts == False:
 				if transmitState:
 					print("Leaving transmit state")
@@ -74,8 +79,21 @@ with serial.Serial(serialPort, 9600, timeout=0.1) as sp:
 				print("Received unknown byte ({}) outside of transmit state".format(inb))
 
 		else:
+			if inb != b'U':
+				pastSync = 1
+			if pastSync and inb != b'\xAA':
+				if packetLeft == 0:
+					logfile.write("\n".encode())
+				pastSync = 2
+
+			if pastSync == 2 and packetLeft == 0:
+				packetLeft = ord(inb)
+
 			if logText:
-				logfile.write(("0x{:02x} \n".format(ord(inb))).encode())
+				logfile.write(("0x{:02x} ".format(ord(inb))).encode())
+				if pastSync==2:
+					if packetLeft > 0:
+						packetLeft -= 1
 			else:
 				logfile.write(inb)
 			send(inb)