File content as of revision 0:0a76ae27065b:

/*
Touchpad driver.

CPV, 3/9/2009
*/

#ifndef __TOUCHPAD_H__
#define __TOUCHPAD_H__


#include "mbed.h"
#include "filters.h"


class TouchpadChannel
{
public:
  void initialise(int min, int quantise_step);
  void tick(int v) { m_filter.tick(v); }
  int quantise(void);
  int operator()(void) { return m_quantised; }
  int get_raw(void) { return m_filter(); }

protected:
  FilterBoxI m_filter;
  int m_min;
  int m_quantise_step;
  int m_quantised;
};


class Touchpad
{
public:
  Touchpad(PinName x0, PinName x1, PinName y0, PinName y1);
  
  void tick(void);
  
  int get_raw_x(void) { return m_ch_x.get_raw(); }
  int get_raw_y(void) { return m_ch_y.get_raw(); }
  
  int hotspot(void) { return (m_ch_x.quantise()>=0 && m_ch_y.quantise()>=0); }
  int get_hotspot_x(void) { return m_ch_x(); }
  int get_hotspot_y(void) { return m_ch_y(); }

protected:
  TouchpadChannel m_ch_x;
  TouchpadChannel m_ch_y;

  PinName m_x0;
  PinName m_x1;
  PinName m_y0;
  PinName m_y1;

  int read(PinName drive_hi, PinName drive_lo, PinName read_hi, PinName read_lo);
  int read_x(void) { return read(m_x1,m_x0,m_y1,m_y0); }
  int read_y(void) { return read(m_y1,m_y0,m_x1,m_x0); }
};


#endif // __TOUCHPAD_H__