first commit

2026-08-25 17:27:33 +00:00 · 2026-06-01 15:58:45 +03:00
commit 89c8a0e2b5
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+/*	shift.c
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2013 Warren Pratt, NR0V
+
+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.h"
+
+void calc_shift (SHIFT a)
+{
+	a->delta = TWOPI * a->shift / a->rate;
+	a->cos_delta = cos (a->delta);
+	a->sin_delta = sin (a->delta);
+}
+
+SHIFT create_shift (int run, int size, double* in, double* out, int rate, double fshift)
+{
+	SHIFT a = (SHIFT) malloc0 (sizeof (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 destroy_shift (SHIFT a)
+{
+	_aligned_free (a);
+}
+
+void flush_shift (SHIFT a)
+{
+	a->phase = 0.0;
+}
+
+void 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 (complex));
+}
+
+void setBuffers_shift(SHIFT a, double* in, double* out)
+{
+	a->in = in;
+	a->out = out;
+}
+
+void setSamplerate_shift (SHIFT a, int rate)
+{
+	a->rate = rate;
+	a->phase = 0.0;
+	calc_shift(a);
+}
+
+void setSize_shift (SHIFT a, int size)
+{
+	a->size = size;
+	flush_shift (a);
+}
+
+/********************************************************************************************************
+*																										*
+*											RXA Properties												*
+*																										*
+********************************************************************************************************/
+
+PORT
+void SetRXAShiftRun (int channel, int run)
+{
+	EnterCriticalSection (&ch[channel].csDSP);
+	rxa[channel].shift.p->run = run;
+	LeaveCriticalSection (&ch[channel].csDSP);
+}
+
+PORT
+void SetRXAShiftFreq (int channel, double fshift)
+{
+	EnterCriticalSection (&ch[channel].csDSP);
+	rxa[channel].shift.p->shift = fshift;
+	calc_shift (rxa[channel].shift.p);
+	LeaveCriticalSection (&ch[channel].csDSP);
+}