mirror of
https://github.com/paparazzi/paparazzi.git
synced 2026-05-09 22:49:53 +08:00
Felix Ruess
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
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* demod_display.c -- signal display
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*
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* Copyright (C) 1996
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* Thomas Sailer (sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* ---------------------------------------------------------------------- */
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#include "multimon.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <signal.h>
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#include <math.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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/* ---------------------------------------------------------------------- */
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#define SAMPLING_RATE 22050
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/* ---------------------------------------------------------------------- */
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static void scope_init(struct demod_state *s)
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{
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memset(&s->l1.scope, 0, sizeof(s->l1.scope));
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s->l1.scope.dispnum = xdisp_start();
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if (s->l1.scope.dispnum == -1)
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return;
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}
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/* ---------------------------------------------------------------------- */
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#define MEMSIZE sizeof(s->l1.scope.data)/sizeof(s->l1.scope.data[0])
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static void scope_demod(struct demod_state *s, float *buffer, int length)
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{
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float *src, *dst;
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int i;
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if (s->l1.scope.dispnum == -1)
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return;
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if (length >= MEMSIZE) {
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src = buffer+length-MEMSIZE;
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dst = s->l1.scope.data;
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i = MEMSIZE;
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} else {
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i = MEMSIZE-length;
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memmove(s->l1.scope.data, s->l1.scope.data+i,
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i*sizeof(s->l1.scope.data[0]));
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src = buffer;
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dst = s->l1.scope.data+i;
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i = length;
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}
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s->l1.scope.datalen += i;
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memcpy(dst, src, i*sizeof(s->l1.scope.data[0]));
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if (s->l1.scope.datalen < MEMSIZE)
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return;
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if (xdisp_update(s->l1.scope.dispnum, s->l1.scope.data))
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s->l1.scope.datalen = 0;
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}
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/* ---------------------------------------------------------------------- */
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const struct demod_param demod_scope = {
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"SCOPE", SAMPLING_RATE, 0, scope_init, scope_demod
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};
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/* ---------------------------------------------------------------------- */
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