#include "filters.h"
#include <stdlib.h>

LPFilter_Frac* New_LP_Frac(float pre_factor)
{
	LPFilter_Frac* self;
	self = (LPFilter_Frac*)malloc(sizeof(LPFilter_Frac));
	if(self != NULL) 
	{
		self->pre_data = 0;
		if(pre_factor > 0 && pre_factor < 1)
			self->pre_factor = pre_factor;
		else
			free(self);
		return self;
	}
	else
	{
		free(self);
		return NULL;
	}
}

float LP_Frac_Update(LPFilter_Frac* self, float new_data)
{
	float output_data = 0;
	output_data = self->pre_factor * self->pre_data + (1 - self->pre_factor) * new_data;	//update new data
	self->pre_data = output_data;					//save data this time as the previous data for next time
	return output_data;
}