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/* -*- c++ -*- */
/*
* Copyright 2002,2004 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.
*/
#ifndef INCLUDED_GR_FXPT_NCO_H
#define INCLUDED_GR_FXPT_NCO_H
#include <gr_core_api.h>
#include <gr_fxpt.h>
#include <gr_complex.h>
/*!
* \brief Numerically Controlled Oscillator (NCO)
* \ingroup misc
*/
class GR_CORE_API gr_fxpt_nco {
gr_uint32 d_phase;
gr_int32 d_phase_inc;
public:
gr_fxpt_nco () : d_phase (0), d_phase_inc (0) {}
~gr_fxpt_nco () {}
// radians
void set_phase (float angle) {
d_phase = gr_fxpt::float_to_fixed (angle);
}
void adjust_phase (float delta_phase) {
d_phase += gr_fxpt::float_to_fixed (delta_phase);
}
// angle_rate is in radians / step
void set_freq (float angle_rate){
d_phase_inc = gr_fxpt::float_to_fixed (angle_rate);
}
// angle_rate is a delta in radians / step
void adjust_freq (float delta_angle_rate)
{
d_phase_inc += gr_fxpt::float_to_fixed (delta_angle_rate);
}
// increment current phase angle
void step ()
{
d_phase += d_phase_inc;
}
void step (int n)
{
d_phase += d_phase_inc * n;
}
// units are radians / step
float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }
float get_freq () const { return gr_fxpt::fixed_to_float (d_phase_inc); }
// compute sin and cos for current phase angle
void sincos (float *sinx, float *cosx) const
{
*sinx = gr_fxpt::sin (d_phase);
*cosx = gr_fxpt::cos (d_phase);
}
// compute cos and sin for a block of phase angles
void sincos (gr_complex *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = gr_complex(gr_fxpt::cos (d_phase) * ampl, gr_fxpt::sin (d_phase) * ampl);
step ();
}
}
// compute sin for a block of phase angles
void sin (float *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (float)(gr_fxpt::sin (d_phase) * ampl);
step ();
}
}
// compute cos for a block of phase angles
void cos (float *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (float)(gr_fxpt::cos (d_phase) * ampl);
step ();
}
}
// compute sin for a block of phase angles
void sin (short *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (short)(gr_fxpt::sin (d_phase) * ampl);
step ();
}
}
// compute cos for a block of phase angles
void cos (short *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (short)(gr_fxpt::cos (d_phase) * ampl);
step ();
}
}
// compute sin for a block of phase angles
void sin (int *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (int)(gr_fxpt::sin (d_phase) * ampl);
step ();
}
}
// compute cos for a block of phase angles
void cos (int *output, int noutput_items, double ampl=1.0)
{
for (int i = 0; i < noutput_items; i++){
output[i] = (int)(gr_fxpt::cos (d_phase) * ampl);
step ();
}
}
// compute cos or sin for current phase angle
float cos () const { return gr_fxpt::cos (d_phase); }
float sin () const { return gr_fxpt::sin (d_phase); }
};
#endif /* INCLUDED_GR_FXPT_NCO_H */
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