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/* -*- c++ -*- */
/*
* Copyright 2002,2004,2013 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.
*/
#ifndef INCLUDED_GR_FXPT_NCO_H
#define INCLUDED_GR_FXPT_NCO_H
#include <blocks/api.h>
#include <blocks/fxpt.h>
#include <gr_complex.h>
namespace gr {
namespace blocks {
/*!
* \brief Numerically Controlled Oscillator (NCO)
* \ingroup misc
*
* Calculate sine and cosine based on the current phase. This
* class has multiple ways to calculate sin/cos and when
* requensting a range will increment the phase based on a
* frequency, which can be set using set_freq. Similar interfaces
* to the fxpt_vco can also be used to set or adjust the current
* phase.
*/
class fxpt_nco
{
private:
uint32_t d_phase;
int32_t d_phase_inc;
public:
fxpt_nco() : d_phase(0), d_phase_inc(0) {}
~fxpt_nco() {}
//! Set the current phase \p angle in radians
void set_phase(float angle) {
d_phase = fxpt::float_to_fixed(angle);
}
//! Update the current phase in radians by \p delta_phase
void adjust_phase(float delta_phase) {
d_phase += fxpt::float_to_fixed(delta_phase);
}
//! angle_rate is in radians / step
void set_freq(float angle_rate) {
d_phase_inc = fxpt::float_to_fixed(angle_rate);
}
//! angle_rate is a delta in radians / step
void adjust_freq(float delta_angle_rate) {
d_phase_inc += fxpt::float_to_fixed(delta_angle_rate);
}
//! increment current phase angle
void step() {
d_phase += d_phase_inc;
}
//! increment current phase angle n times
void step(int n) {
d_phase += d_phase_inc * n;
}
//! units are radians / step
float get_phase() const { return fxpt::fixed_to_float(d_phase); }
float get_freq() const { return fxpt::fixed_to_float(d_phase_inc); }
//! compute sin and cos for current phase angle
void sincos(float *sinx, float *cosx) const
{
*sinx = fxpt::sin(d_phase);
*cosx = 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(fxpt::cos(d_phase) * ampl,
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)(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)(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)(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)(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)(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)(fxpt::cos(d_phase) * ampl);
step();
}
}
//! compute cos or sin for current phase angle
float cos() const { return fxpt::cos(d_phase); }
float sin() const { return fxpt::sin(d_phase); }
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GR_FXPT_NCO_H */
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