diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2013-03-08 09:30:23 -0500 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2013-03-08 09:30:23 -0500 |
| commit | 0970c7eaa165c6dc7d70be55dbf3d272b88fc109 (patch) | |
| tree | b8f09685720baac3d5d1ab89fed0e9bc13ed9c18 /gr-blocks/lib/qa_fxpt.cc | |
| parent | 27a222ad8dcd245e7b9b4ff51141bdf3d8675a3c (diff) | |
| parent | 4389b769891283face9aa397bd4d736f478e97e4 (diff) | |
Merge branch 'master' into next
Diffstat (limited to 'gr-blocks/lib/qa_fxpt.cc')
| -rw-r--r-- | gr-blocks/lib/qa_fxpt.cc | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/gr-blocks/lib/qa_fxpt.cc b/gr-blocks/lib/qa_fxpt.cc new file mode 100644 index 0000000000..9ce26b240b --- /dev/null +++ b/gr-blocks/lib/qa_fxpt.cc @@ -0,0 +1,104 @@ +/* -*- 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 <blocks/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; + +using namespace gr::blocks; + +void +qa_fxpt::t0() +{ + CPPUNIT_ASSERT_DOUBLES_EQUAL(M_PI/2, fxpt::fixed_to_float(0x40000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL(0.0, fxpt::fixed_to_float(0x00000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL(-M_PI, 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((int32_t) 0x40000000, fxpt::float_to_fixed(M_PI/2)); + CPPUNIT_ASSERT_EQUAL((int32_t) 0, fxpt::float_to_fixed(0)); + CPPUNIT_ASSERT_EQUAL((int32_t) 0x80000000, fxpt::float_to_fixed(-M_PI)); + } +} + +void +qa_fxpt::t1() +{ + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0, fxpt::sin (0x00000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0.707106781, fxpt::sin (0x20000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 1, fxpt::sin (0x40000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0.707106781, fxpt::sin (0x60000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0, fxpt::sin (0x7fffffff), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0, fxpt::sin (0x80000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL( 0, fxpt::sin (0x80000001), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL(-1, fxpt::sin (-0x40000000), SIN_COS_TOLERANCE); + CPPUNIT_ASSERT_DOUBLES_EQUAL(-0.707106781, 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 = fxpt::sin(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 = fxpt::cos(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; + fxpt::sincos(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); + } +} |