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      1 #!/usr/bin/python
      2 # Author: Zion Orent <zorent (at] ics.com>
      3 # Copyright (c) 2015 Intel Corporation.
      4 #
      5 # Permission is hereby granted, free of charge, to any person obtaining
      6 # a copy of this software and associated documentation files (the
      7 # "Software"), to deal in the Software without restriction, including
      8 # without limitation the rights to use, copy, modify, merge, publish,
      9 # distribute, sublicense, and/or sell copies of the Software, and to
     10 # permit persons to whom the Software is furnished to do so, subject to
     11 # the following conditions:
     12 #
     13 # The above copyright notice and this permission notice shall be
     14 # included in all copies or substantial portions of the Software.
     15 #
     16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23 
     24 import time, sys, signal, atexit
     25 import pyupm_mpr121 as upmMpr121
     26 
     27 I2C_BUS = upmMpr121.MPR121_I2C_BUS
     28 DEFAULT_I2C_ADDR = upmMpr121.MPR121_DEFAULT_I2C_ADDR
     29 
     30 # Instantiate an MPR121 touch sensor on I2C
     31 myTouchSensor = upmMpr121.MPR121(I2C_BUS, DEFAULT_I2C_ADDR)
     32 
     33 
     34 ## Exit handlers ##
     35 # This stops python from printing a stacktrace when you hit control-C
     36 def SIGINTHandler(signum, frame):
     37 	raise SystemExit
     38 
     39 # This function lets you run code on exit,
     40 # including functions from myTouchSensor
     41 def exitHandler():
     42 	print "Exiting"
     43 	sys.exit(0)
     44 
     45 # Register exit handlers
     46 atexit.register(exitHandler)
     47 signal.signal(signal.SIGINT, SIGINTHandler)
     48 
     49 
     50 
     51 def printButtons(touchSensor):
     52 	buttonPressed = False
     53 
     54 	outputStr = "Buttons Pressed: "
     55 	for i in range(12):
     56 		if (touchSensor.m_buttonStates & (1 << i)):
     57 			outputStr += (str(i) + " ")
     58 			buttonPressed = True
     59 
     60 	if (not buttonPressed):
     61 		outputStr += "None"
     62 
     63 	print outputStr
     64 
     65 	if (touchSensor.m_overCurrentFault):
     66 		print "Over Current Fault detected!"
     67 
     68 
     69 while(1):
     70 	myTouchSensor.readButtons()
     71 	printButtons(myTouchSensor)
     72 
     73 	time.sleep(1)
     74