mpr121: python example for mpr121 touch sensor

Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/python/mpr121.py

@@ -0,0 +1,73 @@
+#!/usr/bin/python
+# Author: Zion Orent <zorent@ics.com>
+# Copyright (c) 2015 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.
+
+import time, sys, signal, atexit
+import pyupm_mpr121 as upmMpr121
+
+I2C_BUS = upmMpr121.MPR121_I2C_BUS
+DEFAULT_I2C_ADDR = upmMpr121.MPR121_DEFAULT_I2C_ADDR
+
+# Instantiate an MPR121 touch sensor on I2C
+myTouchSensor = upmMpr121.MPR121(I2C_BUS, DEFAULT_I2C_ADDR)
+
+
+## Exit handlers ##
+# This stops python from printing a stacktrace when you hit control-C
+def SIGINTHandler(signum, frame):
+	raise SystemExit
+
+# This function lets you run code on exit,
+# including functions from myTouchSensor
+def exitHandler():
+	print "Exiting"
+	sys.exit(0)
+
+# Register exit handlers
+atexit.register(exitHandler)
+signal.signal(signal.SIGINT, SIGINTHandler)
+
+
+
+def printButtons(touchSensor):
+	buttonPressed = False
+
+	outputStr = "Buttons Pressed: "
+	for i in range(12):
+		if (touchSensor.m_buttonStates & (1 << i)):
+			outputStr += (str(i) + " ")
+			buttonPressed = True
+
+	if (not buttonPressed):
+		outputStr += "None"
+
+	print outputStr
+
+	if (touchSensor.m_overCurrentFault):
+		print "Over Current Fault detected!"
+
+
+while(1):
+	myTouchSensor.readButtons()
+	printButtons(myTouchSensor)
+
+	time.sleep(1)