sdrangel/wdsp/shift.cpp

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3.5 KiB
C++

/* shift.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2013 Warren Pratt, NR0V
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
The author can be reached by email at
warren@wpratt.com
*/
#include "comm.hpp"
#include "shift.hpp"
#include "RXA.hpp"
namespace WDSP {
void SHIFT::calc_shift (SHIFT *a)
{
a->delta = TWOPI * a->shift / a->rate;
a->cos_delta = cos (a->delta);
a->sin_delta = sin (a->delta);
}
SHIFT* SHIFT::create_shift (int run, int size, double* in, double* out, int rate, double fshift)
{
SHIFT *a = new SHIFT;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = (double)rate;
a->shift = fshift;
a->phase = 0.0;
calc_shift (a);
return a;
}
void SHIFT::destroy_shift (SHIFT *a)
{
delete (a);
}
void SHIFT::flush_shift (SHIFT *a)
{
a->phase = 0.0;
}
void SHIFT::xshift (SHIFT *a)
{
if (a->run)
{
int i;
double I1, Q1, t1, t2;
double cos_phase = cos (a->phase);
double sin_phase = sin (a->phase);
for (i = 0; i < a->size; i++)
{
I1 = a->in[2 * i + 0];
Q1 = a->in[2 * i + 1];
a->out[2 * i + 0] = I1 * cos_phase - Q1 * sin_phase;
a->out[2 * i + 1] = I1 * sin_phase + Q1 * cos_phase;
t1 = cos_phase;
t2 = sin_phase;
cos_phase = t1 * a->cos_delta - t2 * a->sin_delta;
sin_phase = t1 * a->sin_delta + t2 * a->cos_delta;
a->phase += a->delta;
if (a->phase >= TWOPI) a->phase -= TWOPI;
if (a->phase < 0.0 ) a->phase += TWOPI;
}
}
else if (a->in != a->out)
memcpy (a->out, a->in, a->size * sizeof (dcomplex));
}
void SHIFT::setBuffers_shift(SHIFT *a, double* in, double* out)
{
a->in = in;
a->out = out;
}
void SHIFT::setSamplerate_shift (SHIFT *a, int rate)
{
a->rate = rate;
a->phase = 0.0;
calc_shift(a);
}
void SHIFT::setSize_shift (SHIFT *a, int size)
{
a->size = size;
flush_shift (a);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void SHIFT::SetShiftRun (RXA& rxa, int run)
{
rxa.csDSP.lock();
rxa.shift.p->run = run;
rxa.csDSP.unlock();
}
void SHIFT::SetShiftFreq (RXA& rxa, double fshift)
{
rxa.csDSP.lock();
rxa.shift.p->shift = fshift;
calc_shift (rxa.shift.p);
rxa.csDSP.unlock();
}
} // namespace WDSP