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libsofi.c
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libsofi.c
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/*
* Copyright 2016 Leonard Göhrs <leonard@goehrs.eu>
*
* This 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 3, or (at your option)
* any later version.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#define NUM_SDRS (4)
#define FFT_LEN (1024)
#include <pthread.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "sdr.h"
#include "fft_thread.h"
#include "synchronize.h"
#include "window.h"
#include "combiner.h"
struct sofi_state {
struct sdr devs[NUM_SDRS];
struct fft_thread ffts[NUM_SDRS];
float *window;
struct combiner cb;
};
float *sofi_alloc_real(void)
{
float *target= fftwf_alloc_real(FFT_LEN);
return(target);
}
struct sofi_state *sofi_new(void)
{
struct sofi_state *s= calloc(1, sizeof(struct sofi_state));
if(!s) {
fprintf(stderr, "Allocating sofi state failed!\n");
return(NULL);
}
s->window= window_hamming(FFT_LEN);
for (int i=0; i<NUM_SDRS; i++) {
char path[128];
sprintf(path, "/dev/swradio%d", i);
fprintf(stderr, "Open dev %s\n", path);
if(!sdr_open(&s->devs[i], path)) {
return (NULL);
}
if (!sdr_connect_buffers(&s->devs[i], 8)) {
return (NULL);
}
if(!sdr_set_center_freq(&s->devs[i], 975*100*1000)) {
return(NULL);
}
if(!ft_setup(&s->ffts[i], &s->devs[i], s->window,
FFT_LEN, 32, 1, true)) {
return(NULL);
}
}
for (int i=0; i<NUM_SDRS; i++) {
fprintf(stderr, "Start dev %d\n", i);
if(!sdr_start(&s->devs[i])) {
return(NULL);
}
}
for (int i=NUM_SDRS-1; i>=0; i--) {
fprintf(stderr, "Speed up dev %d\n", i);
if(!sdr_set_sample_rate(&s->devs[i], 2000000)) {
return(NULL);
}
}
fprintf(stderr, "Start syncing\n");
//fprintf(stderr, "*** WARNING: Skipping sync process ***\n");
if(!sync_sdrs(s->devs, NUM_SDRS, 1<<18)) {
return(NULL);
}
fprintf(stderr, "Start fft threads\n");
for (int i=0; i<NUM_SDRS; i++) {
fprintf(stderr, "Start fft %d\n", i);
if(!ft_start(&s->ffts[i])) {
return(NULL);
}
}
if(!cb_init(&s->cb, s->ffts, NUM_SDRS)) {
return(NULL);
}
return(s);
}
uint64_t sofi_get_nsdrs(__attribute__((unused)) struct sofi_state *s)
{
return(NUM_SDRS);
}
uint64_t sofi_get_fftlen(__attribute__((unused)) struct sofi_state *s)
{
return(FFT_LEN);
}
bool sofi_read(struct sofi_state *s, float *mag_dst, float **phase_dsts)
{
bool ret= cb_step(&s->cb, mag_dst, phase_dsts);
return(ret);
}
bool sofi_destroy(__attribute__((unused)) struct sofi_state *s)
{
fprintf(stderr, "sofi_destroy: not yet implemented\n");
return(true);
}