artf4700: Added DigitalGlitchFilter

Initial Java support from Tyler Veness.
Final java support done by Jerry Morrison.

Change-Id: I1f85eb555f9ea4c0250c4c6729d7c51a76f5bef4

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/DigitalGlitchFilterTest.java

@@ -0,0 +1,89 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2008-2015. All Rights Reserved. */
+/* Open Source Software - may be modified and shared by FRC teams. The code */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project. */
+/*----------------------------------------------------------------------------*/
+package edu.wpi.first.wpilibj;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.logging.Logger;
+
+import org.junit.Test;
+
+import edu.wpi.first.wpilibj.test.AbstractComsSetup;
+
+import edu.wpi.first.wpilibj.DigitalInput;
+import edu.wpi.first.wpilibj.Encoder;
+import edu.wpi.first.wpilibj.Counter;
+import edu.wpi.first.wpilibj.DigitalGlitchFilter;
+
+/**
+ * Test for the DigitalGlitchFilter class.
+ *
+ * @author Austin Schuh and Jerry Morrison
+ */
+public class DigitalGlitchFilterTest extends AbstractComsSetup {
+  private static final Logger logger = Logger.getLogger(
+     DigitalGlitchFilterTest.class.getName());
+
+  protected Logger getClassLogger() {
+    return logger;
+  }
+
+  /**
+   * This is a test to make sure that filters can be created and are consistent.
+   * This assumes that the FPGA implementation to actually implement the filter
+   * has been tested.  It does validate that we are successfully able to set and
+   * get the active filters for ports and makes sure that the FPGA filter is
+   * changed correctly, and does the same for the period.
+   */
+  @Test
+  public void testDigitalGlitchFilterBasic() {
+    DigitalInput input1 = new DigitalInput(1);
+    DigitalInput input2 = new DigitalInput(2);
+    DigitalInput input3 = new DigitalInput(3);
+    DigitalInput input4 = new DigitalInput(4);
+    Encoder encoder5 = new Encoder(5, 6);
+    Counter counter7 = new Counter(7);
+
+    DigitalGlitchFilter filter1 = new DigitalGlitchFilter();
+    filter1.add(input1);
+    filter1.setPeriodNanoSeconds(4200);
+
+    DigitalGlitchFilter filter2 = new DigitalGlitchFilter();
+    filter2.add(input2);
+    filter2.add(input3);
+    filter2.setPeriodNanoSeconds(97100);
+
+    DigitalGlitchFilter filter3 = new DigitalGlitchFilter();
+    filter3.add(input4);
+    filter3.add(encoder5);
+    filter3.add(counter7);
+    filter3.setPeriodNanoSeconds(167800);
+
+    assertEquals(4200, filter1.getPeriodNanoSeconds());
+    assertEquals(97100, filter2.getPeriodNanoSeconds());
+    assertEquals(167800, filter3.getPeriodNanoSeconds());
+
+    filter1.remove(input1);
+
+    filter2.remove(input2);
+    filter2.remove(input3);
+
+    filter3.remove(input4);
+    filter3.remove(encoder5);
+    filter3.remove(counter7);
+
+    input1.free();
+    input2.free();
+    input3.free();
+    input4.free();
+    encoder5.free();
+    counter7.free();
+    filter1.free();
+    filter2.free();
+    filter3.free();
+  }
+}

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/WpiLibJTestSuite.java

@@ -20,8 +20,9 @@ import edu.wpi.first.wpilibj.test.AbstractTestSuite;
 @RunWith(Suite.class)
 @SuiteClasses({AnalogCrossConnectTest.class, AnalogPotentiometerTest.class,
     BuiltInAccelerometerTest.class, CANTalonTest.class, CounterTest.class,
-    DIOCrossConnectTest.class, EncoderTest.class, GyroTest.class, MotorEncoderTest.class,
-    MotorInvertingTest.class, PCMTest.class, PDPTest.class, PIDTest.class, PreferencesTest.class,
+    DigitalGlitchFilterTest.class, DIOCrossConnectTest.class, EncoderTest.class,
+    GyroTest.class, MotorEncoderTest.class, MotorInvertingTest.class,
+    PCMTest.class, PDPTest.class, PIDTest.class, PreferencesTest.class,
     RelayCrossConnectTest.class, SampleTest.class, TimerTest.class})
 public class WpiLibJTestSuite extends AbstractTestSuite {
 }