- Ev3 better exception handling

- lasertracker: reverted PID differntial output
- lasertracker: added file trace output


git-svn-id: http://moon:8086/svn/software/trunk/projects/opencv@350 b431acfa-c32f-4a4a-93f1-934dc6c82436

ev3/ev3.py

@@ -76,7 +76,7 @@ class Port(object):
 		self._port_str = port_str
 		self.sock = None
 		self.mode = 'Unknown'
-		if (self.sock is None):
+		while (self.sock is None):
 			try:
 				addr = self._port_str.split(':')
 				_ = socket.inet_aton(addr[0])
@@ -84,8 +84,13 @@ class Port(object):
 				self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
 				self.sock.connect((addr[0], int(addr[1])))
 				self.mode = "TCP"
-				
+				break
+
 			except Exception as e:
+				print ("Can't connect to " + self._port_str)
+				raise (e)
+
+			try:
 				self.sock = serial.Serial(port=self._port_str,
 											baudrate=self.RFCOMM_BAUDRATE,
 											bytesize=serial.EIGHTBITS,
@@ -99,6 +104,11 @@ class Port(object):
 											interCharTimeout=None)
 
 				self.mode = 'Serial'
+				break
+
+			except Exception as e:
+				print ("Can't open " + self._port_str)
+				raise (e)
 
 	def read(self, size, timeout=1.0):
 		if self.mode == 'Serial':