mma7361: Initial implementation

This driver implements support for the DFRobot MMA7361 analog
accelerometer.  It supports 3 axes with a selectable 1.5G and 6G
sensitivity. It is not really meant for navigation, but rather for
uses such as orientation and freefall detection.

Signed-off-by: Jon Trulson <jtrulson@ics.com>

examples/javascript/mma7361.js

@@ -0,0 +1,73 @@
+/*jslint node:true, vars:true, bitwise:true, unparam:true */
+/*jshint unused:true */
+
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 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.
+ */
+
+var sensorObj = require('jsupm_mma7361');
+
+// Instantiate a MMA7361 sensor on analog pins A0 (X), A1 (Y) A2
+// (Z), selftest pin on D2, sleep pin on D3 nd an analog reference
+// value of 5.0.  The freefall pin and the range pin are unused
+// (-1).
+var sensor = new sensorObj.MMA7361(0, 1, 2, 2, 3, -1, -1, 5.0);
+
+var x = new sensorObj.new_floatp();
+var y = new sensorObj.new_floatp();
+var z = new sensorObj.new_floatp();
+
+// 1.5g (true = 6g)
+sensor.setRange(false);
+
+// Every 10th of a second, update and print values
+setInterval(function()
+{
+    // update our values from the sensor
+    sensor.update();
+
+    sensor.getAcceleration(x, y, z);
+    console.log("Accelerometer x: "
+                + sensorObj.floatp_value(x)
+                + " y: " + sensorObj.floatp_value(y)
+                + " z: " + sensorObj.floatp_value(z));
+
+    sensor.getVolts(x, y, z);
+    console.log("Volts x: "
+                + sensorObj.floatp_value(x)
+                + " y: " + sensorObj.floatp_value(y)
+                + " z: " + sensorObj.floatp_value(z));
+
+    console.log();
+
+}, 100);
+
+// exit on ^C
+process.on('SIGINT', function()
+{
+    sensor = null;
+    sensorObj.cleanUp();
+    sensorObj = null;
+    console.log("Exiting.");
+    process.exit(0);
+});