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/java/MMA7361_Example.java

@@ -0,0 +1,66 @@
+/*
+ * 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.
+ */
+
+import upm_mma7361.MMA7361;
+
+public class MMA7361_Example
+{
+    public static void main(String[] args) throws InterruptedException
+    {
+// ! [Interesting]
+
+        // 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).
+        MMA7361 sensor = new MMA7361(0, 1, 2, 2, 3, -1, -1, 5.0f);
+
+        // 1.5g (true = 6g)
+        sensor.setRange(false);
+
+        // Every 10th of a second, update and print values
+        while (true)
+            {
+                // update our values from the sensor
+                sensor.update();
+
+                float dataA[] = sensor.getAcceleration();
+
+                System.out.println("Accelerometer x: " + dataA[0]
+                                   + " y: " + dataA[1]
+                                   + " z: " + dataA[2]);
+
+                float dataV[] = sensor.getVolts();
+
+                System.out.println("Volts x: " + dataV[0]
+                                   + " y: " + dataV[1]
+                                   + " z: " + dataV[2]);
+
+                System.out.println();
+                Thread.sleep(100);
+            }
+
+// ! [Interesting]
+    }
+}