arduino-joystick/Joystick.h

#ifndef _JOYSTICK_H_
#define _JOYSTICK_H_

#include <Arduino.h>
#include <Bounce2.h>

// If you're using the arduino-big-joystick firmware, these numbers can't be
// changed. If you're writing your own Report Descriptor, tune these to match by
// defining them *before* you include Joystick.h.
#ifndef JOYSTICK_NUM_AXES
#define JOYSTICK_NUM_AXES 8
#endif
#ifndef JOYSTICK_NUM_BUTTONS
#define JOYSTICK_NUM_BUTTONS 40
#endif
#define JOYSTICK_NUM_BYTES (JOYSTICK_NUM_BUTTONS+7)/8

enum ButtonType {
  BUTTON_LATCHED = 0x1,
  BUTTON_PULSED = 0x2,
  BUTTON_PULSED_DOUBLE_ACTION = 0x4
};

struct JoyReport {
  int16_t axis[JOYSTICK_NUM_AXES];
  uint8_t button[JOYSTICK_NUM_BYTES];
};

struct Button {
  ButtonType type;
  Bounce bouncher;
};

bool operator ==(JoyReport a, JoyReport b);
bool operator !=(JoyReport a, JoyReport b);

class Joystick {
  public:
    Joystick(bool debug=false);
    void Init();
    void Update();
    
    void AddButton(uint8_t pin, ButtonType type, bool pullup=false);
    void AddAxis(uint8_t pin); // Axes don't actually work yet!
    
    // These functions are deprecated and may become private in a future
    // version. Prefer the above API instead.
    void SetAxis(uint8_t axis, int16_t value);
    void PressButton(uint8_t button);
    void ReleaseButton(uint8_t button);
    void ReleaseAllButtons();
    void Write();

  private:
    void _ReleasePulsedButtons();
    void _UpdateButton(uint8_t index);
    void _UpdateAxis(uint8_t index);
    
    Button _buttons[JOYSTICK_NUM_BUTTONS];
    uint8_t _num_buttons;
    bool _have_pulsed_button;

    uint8_t _axes[JOYSTICK_NUM_AXES];
    uint8_t _num_axes;
    
    JoyReport _joyReport;
    bool _debug;
};

// Internal use only.
#define _BUTTON_PULSED_TYPES (BUTTON_PULSED | BUTTON_PULSED_DOUBLE_ACTION)

#endif