PinChangeInterrupt.hh

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#ifndef COSA_PIN_CHANGE_INTERRUPT_HH
#define COSA_PIN_CHANGE_INTERRUPT_HH

#include "Cosa/Types.h"
#include "Cosa/Event.hh"
#include "Cosa/IOPin.hh"
#include "Cosa/Interrupt.hh"

class PinChangeInterrupt : public IOPin, public Interrupt::Handler {
public:
  static void begin();

  static void end();

  enum InterruptMode {
    ON_FALLING_MODE = 0,
    ON_RISING_MODE = 1,
    ON_CHANGE_MODE = 2
  } __attribute__((packed));

  PinChangeInterrupt(Board::InterruptPin pin,
                     InterruptMode mode = ON_CHANGE_MODE,
                     bool pullup = false) :
    IOPin((Board::DigitalPin) pin, INPUT_MODE, pullup),
    m_mode(mode),
    m_next(NULL)
  {}

  virtual void enable();

  virtual void disable();

  virtual void on_interrupt(uint16_t arg = 0) = 0;

private:
  static PinChangeInterrupt* s_pin[Board::PCMSK_MAX];
  static uint8_t s_state[Board::PCMSK_MAX];

  InterruptMode m_mode;

  PinChangeInterrupt* m_next;

  static void on_interrupt(uint8_t ix, uint8_t mask, uint8_t base);

  friend void PCINT0_vect(void);
#if defined(PCINT1_vect)
  friend void PCINT1_vect(void);
#if defined(PCINT2_vect)
  friend void PCINT2_vect(void);
#if defined(PCINT3_vect)
  friend void PCINT3_vect(void);
#endif
#endif
#endif
};
#endif