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author | reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f> | 2000-03-06 06:04:06 +0000 |
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committer | reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f> | 2000-03-06 06:04:06 +0000 |
commit | 164a0b9f9a7efe4c717b38b7b2c13b2e83b6bf66 (patch) | |
tree | c29227526b71f99f88185e9c6e9e6ae5b1cc6021 /filter.c | |
parent | 3d773c59e479921ea9acc1272798dec5a49e9de8 (diff) | |
download | lcd4linux-164a0b9f9a7efe4c717b38b7b2c13b2e83b6bf66.tar.gz |
[lcd4linux @ 2000-03-06 06:04:06 by reinelt]
minor cleanups
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@4 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
Diffstat (limited to '')
-rw-r--r-- | filter.c | 53 |
1 files changed, 51 insertions, 2 deletions
@@ -1,13 +1,59 @@ +/* $Id: filter.c,v 1.2 2000/03/06 06:04:06 reinelt Exp $ + * + * smooth and damp functions + * + * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at) + * + * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * + * $Log: filter.c,v $ + * Revision 1.2 2000/03/06 06:04:06 reinelt + * + * minor cleanups + * + * + */ + +/* + * + * exported fuctions: + * + * smooth (name, period, value) + * returns an average value over a given period + * uses global variable "tick" + * + * damp (name, value) + * damps a value with exp(-t/tau) + * uses global variable "tau" + * + */ + #include <stdlib.h> #include <stdio.h> #include <string.h> #include <math.h> #include <sys/time.h> -#include "lcd4linux.h" #include "filter.h" +extern int tick; +extern int tau; + #define SLOTS 64 +#define SECONDS(x) (x.tv_sec+x.tv_usec/1000000.0) typedef struct { char *name; @@ -16,7 +62,6 @@ typedef struct { double *value; } FILTER; -#define SECONDS(x) (x.tv_sec+x.tv_usec/1000000.0) double smooth(char *name, int period, double value) { @@ -68,6 +113,7 @@ double smooth(char *name, int period, double value) return v/t; } + double damp(char *name, double value) { static FILTER *Filter=NULL; @@ -76,6 +122,9 @@ double damp(char *name, double value) double max; int i, j; + if (tau==0.0) + return value; + gettimeofday (&now, NULL); for (i=0; i<nFilter; i++) { |