#include <stdio.h>

unsigned int getData(File *data)
{
	unsigned short int x,read;
	
	read = fread(&x,size(x),1,data);
	if(read == 0)
	{
		x = -1;
	}
	return x;
}

void signal(int *filteredData)
{
	/*This code assumes a sampling frequency of 400Hz*/
	float Phi = [0.25,0.25,0.25,0.25];
	unsigned short int sig = 0;
	FILE *dummyData;
	int ctr=0;
	int sum,i;
	int acc1;	/*accumulator for the 50Hz low pass*/
	int dataBuffer[100];
	int acc2[100];	/*accumulator for the 0.5Hz low pass*/
	
	dummyData = fopen("fake.dat","rb");

	while(ctr<400) /*Populate acc2, and phase shift the data by 200 cycles.  A beter way would be prefered*/
	{
		ctr++;
		sig = getdata(dummyData);

		acc1+= (unsigned int) sig;
		if(!(ctr%4))
		{
			dataBuffer[(ctr/4)%100] = acc2[(ctr/4)%100] = acc1/4;
		}
	}

	while(sig != -1) /*We will need to integrate a shutdown sequence*/
	{
		ctr++;
		sig = getdata(dummyData);
		
		acc1+= (unsigned int) sig;
		if(!(ctr%4))
		{
			acc2[(ctr/4)%100] = acc1/4;
			for(int i = 99;i>=0;i--)
			{
				sum += acc2[i];
			}
			*filteredData = dataBuffer[((ctr/4)+50)%100] - (sum/100);
			dataBuffer[(ctr/4)%100 ]= acc1/4;
			sum = 0;
			acc1 = 0;
		}
		if(ctr == 400)
		{
			ctr = 0;
		}
	}
}