1 files changed, 102 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/math/qa_fxpt.cc b/gnuradio-runtime/lib/math/qa_fxpt.cc
new file mode 100644
index 0000000000..d368e7de82
--- /dev/null
+++ b/gnuradio-runtime/lib/math/qa_fxpt.cc
@@ -0,0 +1,102 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <qa_fxpt.h>
+#include <gnuradio/fxpt.h>
+#include <cppunit/TestAssert.h>
+#include <iostream>
+#include <stdio.h>
+#include <unistd.h>
+#include <math.h>
+
+static const float SIN_COS_TOLERANCE = 1e-5;
+
+void
+qa_fxpt::t0()
+{
+  CPPUNIT_ASSERT_DOUBLES_EQUAL(M_PI/2, gr::fxpt::fixed_to_float(0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL(0.0,    gr::fxpt::fixed_to_float(0x00000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL(-M_PI,  gr::fxpt::fixed_to_float(0x80000000), SIN_COS_TOLERANCE);
+
+  if(0) {
+    /*
+     * These are disabled because of some precision issues.
+     *
+     * Different compilers seem to have different opinions on whether
+     * the calulations are done single or double (or extended)
+     * precision.  Any of the answers are fine for our real purpose, but
+     * sometimes the answer is off by a few bits at the bottom.
+     * Hence, the disabled check.
+     */
+    CPPUNIT_ASSERT_EQUAL((gr_int32)0x40000000, gr::fxpt::float_to_fixed(M_PI/2));
+    CPPUNIT_ASSERT_EQUAL((gr_int32)0,          gr::fxpt::float_to_fixed(0));
+    CPPUNIT_ASSERT_EQUAL((gr_int32)0x80000000, gr::fxpt::float_to_fixed(-M_PI));
+  }
+}
+
+void
+qa_fxpt::t1()
+{
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0,           gr::fxpt::sin(0x00000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0.707106781, gr::fxpt::sin(0x20000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 1,           gr::fxpt::sin(0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0.707106781, gr::fxpt::sin(0x60000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0,           gr::fxpt::sin(0x7fffffff), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0,           gr::fxpt::sin(0x80000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL( 0,           gr::fxpt::sin(0x80000001), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL(-1,           gr::fxpt::sin(-0x40000000), SIN_COS_TOLERANCE);
+  CPPUNIT_ASSERT_DOUBLES_EQUAL(-0.707106781, gr::fxpt::sin(-0x20000000), SIN_COS_TOLERANCE);
+
+  for(float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600) {
+    float expected = sin(p);
+    float actual = gr::fxpt::sin(gr::fxpt::float_to_fixed (p));
+    CPPUNIT_ASSERT_DOUBLES_EQUAL(expected, actual, SIN_COS_TOLERANCE);
+  }
+}
+
+void
+qa_fxpt::t2()
+{
+  for(float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600) {
+    float expected = cos(p);
+    float actual = gr::fxpt::cos(gr::fxpt::float_to_fixed(p));
+    CPPUNIT_ASSERT_DOUBLES_EQUAL(expected, actual, SIN_COS_TOLERANCE);
+  }
+}
+
+void
+qa_fxpt::t3()
+{
+  for(float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600) {
+    float expected_sin = sin(p);
+    float expected_cos = cos(p);
+    float actual_sin;
+    float actual_cos;
+    gr::fxpt::sincos(gr::fxpt::float_to_fixed (p), &actual_sin, &actual_cos);
+    CPPUNIT_ASSERT_DOUBLES_EQUAL(expected_sin, actual_sin, SIN_COS_TOLERANCE);
+    CPPUNIT_ASSERT_DOUBLES_EQUAL(expected_cos, actual_cos, SIN_COS_TOLERANCE);
+  }
+}