artf4700: Added DigitalGlitchFilter

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

Change-Id: I1f85eb555f9ea4c0250c4c6729d7c51a76f5bef4

wpilibcIntegrationTests/src/DigitalGlitchFilterTest.cpp

@@ -0,0 +1,60 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include <Counter.h>
+#include <DigitalInput.h>
+#include <Encoder.h>
+#include <DigitalGlitchFilter.h>
+#include "gtest/gtest.h"
+
+/**
+ * Tests that configuring inputs to be filtered succeeds.
+ *
+ * This test actually tests everything except that the actual FPGA
+ * implementation works as intended.  We configure the FPGA and then query it to
+ * make sure that the acutal configuration matches.
+ */
+TEST(DigitalGlitchFilterTest, BasicTest) {
+  DigitalInput input1(1);
+  DigitalInput input2(2);
+  DigitalInput input3(3);
+  DigitalInput input4(4);
+  Encoder encoder5(5, 6);
+  Counter counter7(7);
+
+  // Check that we can make a single filter and set the period.
+  DigitalGlitchFilter filter1;
+  filter1.Add(&input1);
+  filter1.SetPeriodNanoSeconds(4200);
+
+  // Check that we can make a second filter with 2 inputs.
+  DigitalGlitchFilter filter2;
+  filter2.Add(&input2);
+  filter2.Add(&input3);
+  filter2.SetPeriodNanoSeconds(97100);
+
+  // Check that we can make a third filter with an input, an encoder, and a
+  // counter.
+  DigitalGlitchFilter filter3;
+  filter3.Add(&input4);
+  filter3.Add(&encoder5);
+  filter3.Add(&counter7);
+  filter3.SetPeriodNanoSeconds(167800);
+
+  // Verify that the period was properly set for all 3 filters.
+  EXPECT_EQ(4200u, filter1.GetPeriodNanoSeconds());
+  EXPECT_EQ(97100u, filter2.GetPeriodNanoSeconds());
+  EXPECT_EQ(167800u, filter3.GetPeriodNanoSeconds());
+
+  // Clean up.
+  filter1.Remove(&input1);
+  filter2.Remove(&input2);
+  filter2.Remove(&input3);
+  filter3.Remove(&input4);
+  filter3.Remove(&encoder5);
+  filter3.Remove(&counter7);
+}