MobileAverage.c

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/*------------------------------------------------------------------------
 *---------------------           RT-WMP              --------------------
 *------------------------------------------------------------------------
 *                                                         V7.0B  11/05/10
 *
 *
 *  File: ./src/core/MobileAverage.c
 *  Authors: Danilo Tardioli
 *  ----------------------------------------------------------------------
 *  Copyright (C) 2000-2010, Universidad de Zaragoza, SPAIN
 *
 *  Contact Addresses: Danilo Tardioli                   dantard@unizar.es
 *
 *  RT-WMP 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.
 *
 *  RT-WMP  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
 *  distributed with RT-WMP;  see file COPYING.   If not,  write to the
 *  Free Software  Foundation,  59 Temple Place  -  Suite 330,  Boston, MA
 *  02111-1307, USA.
 *
 *  As a  special exception, if you  link this  unit  with other  files to
 *  produce an   executable,   this unit  does  not  by  itself cause  the
 *  resulting executable to be covered by the  GNU General Public License.
 *  This exception does  not however invalidate  any other reasons why the
 *  executable file might be covered by the GNU Public License.
 *
 *----------------------------------------------------------------------*/

#include "include/MobileAverage.h"
#include "include/definitions.h"
#include "config/compiler.h"

extern Status status;

void mobile_avg_free(MobileAverage * e){
        FREE(e->elem);
}
void mobile_avg_init(MobileAverage * e, int n_elements){
        e->elem=(char *) MALLOC(n_elements*sizeof(char));
        e->n_elements=n_elements;
        e->seen=0;
        e->idx=0;
        e->initialized=0;
        e->avgd_value=0; /* or 0 better */
};

void mobile_avg_new_value(MobileAverage*e, char val){
        int i;
        int avg = 0;
        e->seen=getRawActualTimeus();
        if (!e->initialized){
                int end = (e->n_elements/status.rssi_rising_factor);
                for (i=0 ; i < end ; i++){
                        e->elem[i]=val;
                        e->idx++;
                }
                e->avgd_value=val;
                e->initialized=1;
        } else {
                e->idx++;
                if (e->idx>=e->n_elements) e->idx=0;
                e->elem[e->idx]=val;
                for (i=0;i<e->n_elements;i++){
                        avg+=(e->elem[i]);
                }
                avg=avg/e->n_elements;
                e->avgd_value= (char) avg;
        }
};

void mobile_avg_reset(MobileAverage* e) {
        //XXX
        e->initialized = 0;
        e->avgd_value = 0;
};


char mobile_avg_get_averaged_value(MobileAverage * e){
        return e->avgd_value;
};

unsigned long mobile_avg_get_age(MobileAverage * e){
   return (DO_DIV64(getRawActualTimeus(),1000) - DO_DIV64(e->seen,1000)) ;
};