isd1820: Initial implementation

This driver implements support for the Grove Recorder.  It records up
to about 10 seconds of audio, and can play it back on command.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>

examples/python/isd1820.py

@@ -0,0 +1,74 @@
+#!/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, atexit
+import pyupm_isd1820 as upmIsd1820
+
+# Instantiate a ISD1820 on digital pins 2 (play) and 3 (record)
+# This example was tested on the Grove Recorder.
+myRecorder = upmIsd1820.ISD1820(2, 3)
+
+
+doRecord = False
+
+if len(sys.argv) > 1:
+	doRecord = True
+
+
+# This lets you run code on exit,
+# including functions from myRecorder
+def exitHandler():
+	# turn off whatever we were doing.
+	if (doRecord):
+		myRecorder.record(False)
+	else:
+		myRecorder.play(False)
+	print "Exiting"
+	sys.exit(0)
+
+# Register exit handlers
+atexit.register(exitHandler)
+
+
+# if an argument was specified (any argument), go into record mode,
+# else playback a previously recorded sample
+
+print "Supply any argument to the command line to record."
+print "Running this example without arguments will play back any "
+print "previously recorded sound."
+print "There is approximately 10 seconds of recording time.\n"
+
+
+# depending on what was selected, do it, and sleep for 15 seconds
+if (doRecord):
+	myRecorder.record(True)
+else:
+	myRecorder.play(True)
+    
+# There are about 10 seconds of recording/playback time, so we will
+# sleep for a little extra time.
+print "Sleeping for 15 seconds..."
+time.sleep(15)
+
+
+# exitHandler runs automatically