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dfilter_avg.h
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dfilter_avg.h
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/*
* Copyright (c) 2012, Regents of the University of California
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the University of California, Berkeley nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* Averaging filter using a circular buffer
*
* by Andrew Pullin
*
* v.0.1
*/
#ifndef __DFILTER_AVG_H
#define __DFILTER_AVG_H
typedef struct {
unsigned int windowLen;
unsigned int index;
int* data;
long accum;
} dfilterAvgInt_t;
// Creates a filter and returns a point.
// Caller should check for NULL returns.
void dfilterAvgCreate(dfilterAvgInt_t*, unsigned int);
// Add a value to the circular buffer, incrementing index
void dfilterAvgUpdate(dfilterAvgInt_t*, int);
// Calculate and return average value;
int dfilterAvgCalc(dfilterAvgInt_t*);
//Zero all values in the filter
void dfilterZero(dfilterAvgInt_t* filt);
#endif // __DFILTER_AVG_H