listing serial ports, cleaned up exception return in threaded reader and proper port closing when the loop breaks

temp_log.py

@@ -1,5 +1,7 @@
 #! /usr/bin/env python
+import glob
 import io
+import platform
 import Queue
 import serial
 import sys
@@ -8,6 +10,28 @@ import time
 defaultSerialPort = '/dev/ttyACM0'
 defaultVersion = 0
 
+def list_serial_ports():
+    """Lists serial ports, taken from http://stackoverflow.com/questions/11303850/what-is-the-cross-platform-method-of-enumerating-serial-ports-in-python-includi"""
+    system_name = platform.system()
+    if system_name == "Windows":
+        # Scan for available ports.
+        available = []
+        for i in range(256):
+            try:
+                s = serial.Serial(i)
+                available.append(i)
+                s.close()
+            except serial.SerialException:
+                pass
+        return available
+    elif system_name == "Darwin":
+        # Mac
+        return glob.glob('/dev/tty*') + glob.glob('/dev/cu*')
+    else:
+        # Assume Linux or something else
+        return glob.glob('/dev/ttyS*') + glob.glob('/dev/ttyUSB*') + glob.glob('/dev/ttyACM*')
+
+
 class ParseException(Exception):
     """Parser Exceptions"""
     pass
@@ -29,10 +53,13 @@ def parse_line(line, version = defaultVersion):
 
 
 def threaded_reader(source, dataQueue, commandQueue):
-    import kivy.logger
-    ser = serial.Serial(source, baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
-    sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))
-    ser.isOpen()
+    try:
+        ser = serial.Serial(source, baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
+        sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))
+        ser.isOpen()
+    except Exception, e:
+        dataQueue.put({'exception' : str(e)})
+        return
     buffer = ''
     runTime = ''
     cmd = ''
@@ -47,12 +74,12 @@ def threaded_reader(source, dataQueue, commandQueue):
             data = parse_line(ser.readline(), defaultVersion)
             runTime = time.time()
         except Exception, e:
-            kivy.logger.Logger.exception(e)
-            continue
+            dataQueue.put({'exception' : str(e)})
         if data and runTime:
             item = {'time' : runTime, 'data' : data}
-            kivy.logger.Logger.debug(str(item))
             dataQueue.put(item)
+    # close out the fds
+    ser.close()
 
 
 def main(args = sys.argv):