hka5: Initial implementation

This module implements support for the DFRobot Laser PM2.5 Sensor.  It
connects to a UART at 9600 baud.  This is the only baud rate
supported.  It optionally supports Reset and Set/Sleep gpios as well.

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

examples/java/HKA5_Example.java

@@ -0,0 +1,59 @@
+/*
+ * 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_hka5.HKA5;
+
+public class HKA5_Example
+{
+    public static void main(String[] args) throws InterruptedException
+    {
+// ! [Interesting]
+        System.out.println("Initializing...");
+
+        // Instantiate a HKA5 sensor on uart 0.  We don't use the set or
+        // reset pins, so we pass -1 for them.
+        HKA5 sensor = new HKA5(0, -1, -1);
+
+        // update once every 2 seconds and output data
+        while (true)
+            {
+                sensor.update();
+
+                System.out.println("PM 1  : "
+                                   + sensor.getPM1()
+                                   + " ug/m3");
+                System.out.println("PM 2.5: "
+                                   + sensor.getPM2_5()
+                                   + " ug/m3");
+                System.out.println("PM 10 : "
+                                   + sensor.getPM10()
+                                   + " ug/m3");
+
+                System.out.println();
+                Thread.sleep(2000);
+            }
+
+// ! [Interesting]
+    }
+}