Commit 4d66f418 authored by Steffen Vogel's avatar Steffen Vogel 🎅🏼
Browse files

added new class for moving window buffers

parent 27751548
/** A sliding/moving window.
*
* @file
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
* VILLAScommon
*
* 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 3 of the License, or
* 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, see <http://www.gnu.org/licenses/>.
*********************************************************************************/
#pragma once
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
struct window {
double *data;
size_t steps;
size_t mask;
size_t pos;
};
int window_init(struct window *w, size_t steps, double init);
int window_destroy(struct window *w);
double window_update(struct window *w, double in);
#ifdef __cplusplus
}
#endif
......@@ -48,6 +48,7 @@ add_library(villas-common SHARED
version.cpp
copyright.cpp
common.c
window.c
)
execute_process(
......
/** A sliding/moving window.
*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
* VILLAScommon
*
* 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 3 of the License, or
* 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, see <http://www.gnu.org/licenses/>.
*********************************************************************************/
#include <stdlib.h>
#include <villas/window.h>
#include <villas/utils.h>
int window_init(struct window *w, size_t steps, double init)
{
size_t len = LOG2_CEIL(steps);
/* Allocate memory for ciruclar history buffer */
w->data = alloc(len * sizeof(double));
if (!w->data)
return -1;
for (size_t i = 0; i < len; i++)
w->data[i] = init;
w->steps = steps;
w->pos = len;
w->mask = len - 1;
return 0;
}
int window_destroy(struct window *w)
{
free(w->data);
return 0;
}
double window_update(struct window *w, double in)
{
double out = w->data[(w->pos - w->steps) & w->mask];
w->data[w->pos++] = in;
return out;
}
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment