mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-10-30 20:40:20 -04:00
133 lines
3.5 KiB
C++
133 lines
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
|