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/* -*- 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);
}
}
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