File content as of revision 0:0a76ae27065b:

/*
mbed touchpad & accelerometer experiments.

CPV, 14/09/2009
*/


#ifndef __FILTERS_H__
#define __FILTERS_H__

#define FILTER_MAX_SIZE  16

class FilterBoxF
{
public:
  FilterBoxF(void) { initialise(FILTER_MAX_SIZE); }
  void initialise(unsigned int size);
  float tick(float in);
  float get() { return m_out; }
  float operator()(void) { return m_out; }
  
protected:
  float m_history[FILTER_MAX_SIZE];
  unsigned int m_size;
  unsigned int m_index;
  float m_out;
};


class FilterBoxI
{
public:
  FilterBoxI(void) { initialise(FILTER_MAX_SIZE); }
  void initialise(unsigned int size);
  int tick(int in);
  int operator()(void) { return m_out; }
  
protected:
  int m_history[FILTER_MAX_SIZE];
  unsigned int m_size;
  unsigned int m_index;
  int m_out;
};


class FilterIirI
{
public:
  FilterIirI(void) { initialise(); }
  void initialise(int tau=1, int limit=0xffff);
  int tick(int in);
  int operator()(void) { return m_out; }
  
protected:
  int m_out;
  int m_remainder;
  int m_limit;
  int m_tau;
};


#endif // __FILTERS_H__