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/*
* Moving average
*
* Copyright (c) 2020 Michael Buesch <m@bues.ch>
*
* 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.
*/
#include "compat.h"
#include "debug.h"
#include "movingavg.h"
#include "util.h"
#include <string.h>
movingavg_t _movingavg_calc(struct movingavg *m, movingavg_t newvalue)
{
movingavgsum_t avgsum;
uint8_t size;
uint8_t count;
uint8_t begin;
uint8_t end;
avgsum = m->avgsum;
size = m->size;
count = m->count;
begin = m->begin;
end = m->end;
if (count >= size) {
avgsum -= m->buf[begin];
if (++begin >= size)
begin = 0;
}
m->buf[end] = newvalue;
if (++end >= size)
end = 0;
avgsum += newvalue;
if (count < size)
count++;
m->avgsum = avgsum;
m->count = count;
m->begin = begin;
m->end = end;
return (movingavg_t)(avgsum / count);
}
void _movingavg_init(struct movingavg *m, uint8_t size)
{
memset(m, 0, sizeof(*m));
m->size = size;
}
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