tests: add a test of ilowpass with low gain

This test replicates an ilowpass off-by-one error reported by Stuart Stevenson: https://sourceforge.net/p/emc/mailman/message/35761624/ Signed-off-by: Sebastian Kuzminsky <[email protected]>
LinuxCNC · Apr 10, 2017 · d7813e8 · d7813e8
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diff --git a/tests/ilowpass/low-gain/README b/tests/ilowpass/low-gain/README
@@ -0,0 +1,2 @@
+Test that ilowpass's output gets all the way to its target, even with
+low gain.
diff --git a/tests/ilowpass/low-gain/expected b/tests/ilowpass/low-gain/expected
@@ -0,0 +1,3 @@
+4
+0
+-5
diff --git a/tests/ilowpass/low-gain/test.hal b/tests/ilowpass/low-gain/test.hal
@@ -0,0 +1,20 @@
+loadrt threads
+loadrt ilowpass
+addf ilowpass.0 thread1
+
+setp ilowpass.0.scale 1
+setp ilowpass.0.gain 0.1
+
+start
+
+setp ilowpass.0.in 4
+loadusr -w sleep 1
+getp ilowpass.0.out
+
+setp ilowpass.0.in 0
+loadusr -w sleep 1
+getp ilowpass.0.out
+
+setp ilowpass.0.in -5
+loadusr -w sleep 1
+getp ilowpass.0.out
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Test that ilowpass's output gets all the way to its target, even with
		low gain.