2024-06-16 09:31:13 +00:00
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/* slew.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2023 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#include "comm.hpp"
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#include "slew.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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enum _USLEW
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{
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BEGIN,
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WAIT,
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UP,
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ON
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};
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void USLEW::calc_uslew (USLEW *a)
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{
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int i;
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2024-06-25 01:50:48 +00:00
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float delta, theta;
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2024-06-16 09:31:13 +00:00
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a->runmode = 0;
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a->state = BEGIN;
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a->count = 0;
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a->ndelup = (int)(a->tdelay * a->rate);
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a->ntup = (int)(a->tupslew * a->rate);
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2024-06-25 01:50:48 +00:00
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a->cup = new float[a->ntup + 1]; // (float *) malloc0 ((a->ntup + 1) * sizeof (float));
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delta = PI / (float)a->ntup;
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2024-06-16 09:31:13 +00:00
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theta = 0.0;
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for (i = 0; i <= a->ntup; i++)
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{
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a->cup[i] = 0.5 * (1.0 - cos (theta));
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theta += delta;
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}
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*a->ch_upslew &= ~((long)1); // InterlockedBitTestAndReset (a->ch_upslew, 0);
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}
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void USLEW::decalc_uslew (USLEW *a)
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{
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delete[] (a->cup);
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}
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2024-06-25 01:50:48 +00:00
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USLEW* USLEW::create_uslew (TXA *txa, std::atomic<long> *ch_upslew, int size, float* in, float* out, float rate, float tdelay, float tupslew)
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{
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USLEW *a = new USLEW;
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a->txa = txa;
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a->ch_upslew = ch_upslew;
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a->size = size;
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a->in = in;
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a->out = out;
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a->rate = rate;
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a->tdelay = tdelay;
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a->tupslew = tupslew;
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calc_uslew (a);
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return a;
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}
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void USLEW::destroy_uslew (USLEW *a)
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{
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decalc_uslew (a);
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delete (a);
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}
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void USLEW::flush_uslew (USLEW *a)
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{
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a->state = BEGIN;
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a->runmode = 0;
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*a->ch_upslew &= ~1L; //InterlockedBitTestAndReset (a->ch_upslew, 0);
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}
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void USLEW::xuslew (USLEW *a)
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{
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if (!a->runmode && TXA::UslewCheck (*a->txa))
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a->runmode = 1;
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long upslew = *a->ch_upslew;
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*a->ch_upslew = 1L;
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if (a->runmode && upslew) //_InterlockedAnd (a->ch_upslew, 1))
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{
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int i;
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2024-06-25 01:50:48 +00:00
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float I, Q;
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2024-06-16 09:31:13 +00:00
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for (i = 0; i < a->size; i++)
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{
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I = a->in[2 * i + 0];
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Q = a->in[2 * i + 1];
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switch (a->state)
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{
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case BEGIN:
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a->out[2 * i + 0] = 0.0;
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a->out[2 * i + 1] = 0.0;
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if ((I != 0.0) || (Q != 0.0))
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{
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if (a->ndelup > 0)
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{
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a->state = WAIT;
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a->count = a->ndelup;
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}
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else if (a->ntup > 0)
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{
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a->state = UP;
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a->count = a->ntup;
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}
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else
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a->state = ON;
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}
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break;
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case WAIT:
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a->out[2 * i + 0] = 0.0;
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a->out[2 * i + 1] = 0.0;
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if (a->count-- == 0)
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{
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if (a->ntup > 0)
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{
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a->state = UP;
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a->count = a->ntup;
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}
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else
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a->state = ON;
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}
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break;
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case UP:
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a->out[2 * i + 0] = I * a->cup[a->ntup - a->count];
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a->out[2 * i + 1] = Q * a->cup[a->ntup - a->count];
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if (a->count-- == 0)
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a->state = ON;
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break;
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case ON:
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a->out[2 * i + 0] = I;
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a->out[2 * i + 1] = Q;
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*a->ch_upslew &= ~((long)1); // InterlockedBitTestAndReset (a->ch_upslew, 0);
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a->runmode = 0;
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break;
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}
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}
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}
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else if (a->out != a->in)
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2024-06-24 20:23:10 +00:00
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memcpy (a->out, a->in, a->size * sizeof (wcomplex));
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2024-06-16 09:31:13 +00:00
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}
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2024-06-25 01:50:48 +00:00
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void USLEW::setBuffers_uslew (USLEW *a, float* in, float* out)
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{
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a->in = in;
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a->out = out;
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}
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void USLEW::setSamplerate_uslew (USLEW *a, int rate)
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{
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decalc_uslew (a);
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a->rate = rate;
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calc_uslew (a);
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}
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void USLEW::setSize_uslew (USLEW *a, int size)
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{
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a->size = size;
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flush_uslew (a);
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}
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/********************************************************************************************************
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* *
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* TXA Properties *
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* *
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********************************************************************************************************/
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2024-06-25 01:50:48 +00:00
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void USLEW::SetuSlewTime (TXA& txa, float time)
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{
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// NOTE: 'time' is in seconds
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txa.csDSP.lock();
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USLEW *a = txa.uslew.p;
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decalc_uslew (a);
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a->tupslew = time;
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calc_uslew (a);
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txa.csDSP.unlock();
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}
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} // namespace WDSP
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