34 lines
1023 B
C
34 lines
1023 B
C
#ifndef _HELPFUNCTIONS_H_
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#define _HELPFUNCTIONS_H_
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//#include "definitions.h"
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int sort_desc(const void *cmp1, const void *cmp2);
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float filterMedian(int16_t* values);
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int sort_desc(const void *cmp1, const void *cmp2) //compare function for qsort
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{
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float a = *((float *)cmp1);
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float b = *((float *)cmp2);
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return a > b ? -1 : (a < b ? 1 : 0);
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}
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float filterMedian(int16_t* values) {
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float copied_values[CURRENT_FILTER_SIZE];
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for(int i=0;i<CURRENT_FILTER_SIZE;i++) {
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copied_values[i] = values[i]; //TODO: maybe some value filtering/selection here
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}
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float copied_values_length = sizeof(copied_values) / sizeof(copied_values[0]);
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qsort(copied_values, copied_values_length, sizeof(copied_values[0]), sort_desc);
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float mean=copied_values[CURRENT_FILTER_SIZE/2];
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for (uint8_t i=1; i<=CURRENT_MEANVALUECOUNT;i++) {
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mean+=copied_values[CURRENT_FILTER_SIZE/2-i]+copied_values[CURRENT_FILTER_SIZE/2+i]; //add two values around center
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}
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mean/=(1+CURRENT_MEANVALUECOUNT*2);
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return mean;
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}
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#endif |