@@ -43,9 +43,18 @@ public class GPIO {
   public static final int HIGH = 1;
 
   public static final int NONE = 0;
-  public static final int CHANGE = 1;     // trigger when level changes
-  public static final int FALLING = 2;    // trigger when level changes from high to low
-  public static final int RISING = 3;     // trigger when level changes from low to high
+  /**
+   *  trigger when level changes
+   */
+  public static final int CHANGE = 1;
+  /**
+   *  trigger when level changes from high to low
+   */
+  public static final int FALLING = 2;
+  /**
+   *  trigger when level changes from low to high
+   */
+  public static final int RISING = 3;
 
   protected static Map<Integer, Thread> irqThreads = new HashMap<Integer, Thread>();
   protected static boolean serveInterrupts = true;
 
@@ -33,12 +33,30 @@
 
 public class SPI {
 
-  public static final int MODE0 = 0;      // CPOL=0, CPHA=0, most common
-  public static final int MODE1 = 1;      // CPOL=0, CPHA=1
-  public static final int MODE2 = 2;      // CPOL=1, CPHA=0
-  public static final int MODE3 = 3;      // CPOL=1, CPHA=1
-  public static final int MSBFIRST = 0;   // most significant bit first, most common
-  public static final int LSBFIRST = 1;   // least significant bit first
+  /**
+   *  CPOL=0, CPHA=0, most common
+   */
+  public static final int MODE0 = 0;
+  /**
+   *  CPOL=0, CPHA=1
+   */
+  public static final int MODE1 = 1;
+  /**
+   *  CPOL=1, CPHA=0
+   */
+  public static final int MODE2 = 2;
+  /**
+   *  CPOL=1, CPHA=1
+   */
+  public static final int MODE3 = 3;
+  /**
+   *  most significant bit first, most common
+   */
+  public static final int MSBFIRST = 0;
+  /**
+   *  least significant bit first
+   */
+  public static final int LSBFIRST = 1;
 
   protected int dataOrder = 0;
   protected String dev;