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/* div.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2014 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"
#define MAX_NR (8) // maximum number of receivers to mix
MDIV create_div (int run, int nr, int size, double **in, double *out)
{
int i;
MDIV a = (MDIV) malloc0 (sizeof (mdiv));
a->run = run;
a->nr = nr;
a->size = size;
a->out = out;
a->in = (double **) malloc0 ( MAX_NR * sizeof (double *));
if (in != 0)
for (i = 0; i < nr; i++) a->in[i] = in[i];
a->Irotate = (double *) malloc0 (MAX_NR * sizeof (double));
a->Qrotate = (double *) malloc0 (MAX_NR * sizeof (double));
InitializeCriticalSectionAndSpinCount (&a->cs_update, 2500);
for (i = 0; i < 4; i++) ///////////// legacy interface - remove
a->legacy[i] = (double *) malloc0 (2048 * sizeof (complex)); ///////////// legacy interface - remove
return a;
}
void destroy_div (MDIV a)
{
int i; ///////////// legacy interface - remove
DeleteCriticalSection (&a->cs_update);
for (i = 0; i < 4; i++) ///////////// legacy interface - remove
_aligned_free (a->legacy[i]); ///////////// legacy interface - remove
_aligned_free (a->Qrotate);
_aligned_free (a->Irotate);
_aligned_free (a->in);
_aligned_free (a);
}
void flush_div (MDIV a)
{
}
void xdiv (MDIV a)
{
if (a->run)
{
EnterCriticalSection (&a->cs_update);
if (a->output != a->nr)
{
if (a->out != a->in[a->output])
memcpy (a->out, a->in[a->output], a->size * sizeof (complex));
}
else
{
int i, j;
double I, Q;
memset (a->out, 0, a->size * sizeof (complex));
for (i = 0; i < a->nr; i++)
for (j = 0; j < a->size; j++)
{
I = a->in[i][2 * j + 0];
Q = a->in[i][2 * j + 1];
a->out[2 * j + 0] += a->Irotate[i] * I - a->Qrotate[i] * Q;
a->out[2 * j + 1] += a->Irotate[i] * Q + a->Qrotate[i] * I;
}
}
LeaveCriticalSection (&a->cs_update);
}
else
memcpy (a->out, a->in[0], a->size * sizeof (complex));
}
/********************************************************************************************************
* *
* CALLS FOR EXTERNAL USE *
* *
********************************************************************************************************/
#define MAX_EXT_DIVS (2) // maximum number of DIVs called from outside wdsp
__declspec (align (16)) MDIV pdiv[MAX_EXT_DIVS]; // array of pointers for DIVs used EXTERNAL to wdsp
PORT
void create_divEXT (int id, int run, int nr, int size)
{
pdiv[id] = create_div (run, nr, size, 0, 0);
}
PORT
void destroy_divEXT (int id)
{
destroy_div (pdiv[id]);
}
PORT
void flush_divEXT (int id)
{
flush_div (pdiv[id]);
}
PORT
void xdivEXT (int id, int nsamples, double **in, double *out)
{
int i;
MDIV a = pdiv[id];
a->size = nsamples;
a->out = out;
for (i = 0; i < a->nr; i++) a->in[i] = in[i];
xdiv (a);
}
// 0 - does nothing; 1 - operates
PORT
void SetEXTDIVRun (int id, int run)
{
MDIV a = pdiv[id];
EnterCriticalSection (&a->cs_update);
a->run = run;
LeaveCriticalSection (&a->cs_update);
}
// size of data buffer in complex samples
PORT
void SetEXTDIVBuffsize (int id, int size)
{
MDIV a = pdiv[id];
EnterCriticalSection (&a->cs_update);
a->size = size;
LeaveCriticalSection (&a->cs_update);
}
// number of receivers being used for diversity
PORT
void SetEXTDIVNr (int id, int nr)
{
MDIV a = pdiv[id];
EnterCriticalSection (&a->cs_update);
a->nr = nr;
LeaveCriticalSection (&a->cs_update);
}
// number of which receiver to output
// if output==nr, mixing occurs
PORT
void SetEXTDIVOutput (int id, int output)
{
MDIV a = pdiv[id];
EnterCriticalSection (&a->cs_update);
a->output = output;
LeaveCriticalSection (&a->cs_update);
}
// I and Q "rotate" multipliers for each receiver
// can be set to 1.0 and 0.0 for "reference receiver"
PORT
void SetEXTDIVRotate (int id, int nr, double *Irotate, double *Qrotate)
{
MDIV a = pdiv[id];
EnterCriticalSection (&a->cs_update);
memcpy (a->Irotate, Irotate, nr * sizeof (double));
memcpy (a->Qrotate, Qrotate, nr * sizeof (double));
LeaveCriticalSection (&a->cs_update);
}
/********************************************************************************************************
* *
* LEGACY INTERFACE - REMOVE *
* *
********************************************************************************************************/
PORT
void xdivEXTF (int id, int size, float **input, float *Iout, float *Qout)
{
int i, j;
MDIV a = pdiv[id];
if (a->run)
{
a->size = size;
for (i = 0; i < a->nr; i++)
{
for (j = 0; j < a->size; j++)
{
a->legacy[i][2 * j + 0] = (double)input[2 * i + 0][j];
a->legacy[i][2 * j + 1] = (double)input[2 * i + 1][j];
}
a->in[i] = a->legacy[i];
}
a->out = a->legacy[3];
xdiv (a);
for (j = 0; j < a->size; j++)
{
Iout[j] = (float)a->legacy[3][2 * j + 0];
Qout[j] = (float)a->legacy[3][2 * j + 1];
}
}
}
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