examples: Cleanup Python examples

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/python/gpio_advanced.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+
+# Author: Brendan Le Foll <brendan.le.foll@intel.com>
+# Copyright (c) 2014 Intel Corporation.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
+#
+# Example Usage: Triggers ISR upon GPIO state change
+
+import mraa
+import time
+import sys
+
+class Counter:
+    count = 0
+
+c = Counter()
+
+# inside a python interrupt you cannot use 'basic' types so you'll need to use
+# objects
+def isr_routine(gpio):
+    print("pin " + repr(gpio.getPin(True)) + " = " + repr(gpio.read()))
+    c.count += 1
+
+# GPIO
+pin = 6;
+
+try:
+    # initialise GPIO
+    x = mraa.Gpio(pin)
+
+    print("Starting ISR for pin " + repr(pin))
+
+    # set direction and edge types for interrupt
+    x.dir(mraa.DIR_IN)
+    x.isr(mraa.EDGE_BOTH, isr_routine, x)
+
+    # wait until ENTER is pressed
+    var = raw_input("Press ENTER to stop")
+    x.isrExit()
+except ValueError as e:
+    print(e)