File content as of revision 22:d7870b7b442f:

#ifndef GAMEPAD_H
#define GAMEPAD_H

#include <bitset>

// Forward declaration of the classes that we use from the mbed library
// This avoids the need for us to include the huge mbed.h header inside our
// own library API

/** Gamepad Class
* @brief with the para and elemets of LCD pad i sLCD
* @author Zhang Xinyu
* @school EE of  SWJTU &leeds joint school
* @date  MAY  2019
*/ 

namespace mbed
{
class AnalogIn;
class InterruptIn;
class PwmOut;
class Timeout;
}

#define TOL 0.1f
#define RAD2DEG 57.2957795131f

/** Enum for direction 
* @ details defined the direction  of joysticks 
* @ param  pushed defined the CENTRE N,NE,E,SE,S,SW,W,NW acording to agnles
*/
enum Direction {
    CENTRE, 
    N,      
    NE,   
    E,      
    SE,     
    S,      
    SW,      
    W,       
    NW      
};

/** vector struct */
struct Vector2D {
    float x; /** < char for x value position> */
    float y; /** < char for y value position> */
    
};

/** Polar coordinate Struct
* @ param the vara magnitude 
* @ param float for angle (in degrees) 
* @ details the vara and angle are use by other function 
 */
 
 /** vector struct */
struct Polar {
    float vara;  /** < char for vara magnatic value of joystick> */
    float angle;  /** < char for angle by joysticks accoring to LCD> */
};

/** Gamepad Class
@brief Library of the gamepad 
@author zhang xinyu
@date May 2019
*/
class Gamepad
{
    public:
    /** Gamepad events 
 * @brief List of events that can be registered on the gamepad
 * @ param defined the button in the pad
 */
enum GamepadEvent {
    A_PRESSED,     ///< Button A has been pressed
    B_PRESSED,     ///< Button B has been pressed
    X_PRESSED,     ///< Button X has been pressed
    Y_PRESSED,     ///< Button Y has been pressed
    L_PRESSED,     ///< Button L has been pressed
    R_PRESSED,     ///< Button R has been pressed
    BACK_PRESSED,  ///< Button "Back" has been pressed
    START_PRESSED, ///< Button "Start" has been pressed
    JOY_PRESSED,   ///< Joystick button has been pressed
    N_EVENTS       ///< A dummy flag that marks the end of the list
};
private:
    mbed::PwmOut *_led1;
    mbed::PwmOut *_led2;
    mbed::PwmOut *_led3;
    mbed::PwmOut *_led4;
    mbed::PwmOut *_led5;
    mbed::PwmOut *_led6;

    mbed::InterruptIn *_button_A;
    mbed::InterruptIn *_button_B;
    mbed::InterruptIn *_button_X;
    mbed::InterruptIn *_button_Y;
    mbed::InterruptIn *_button_L;
    mbed::InterruptIn *_button_R;
    mbed::InterruptIn *_button_back;
    mbed::InterruptIn *_button_start;
    mbed::InterruptIn *_button_joystick;

    mbed::AnalogIn *_vert;
    mbed::AnalogIn *_horiz;

    mbed::PwmOut   *_buzzer;
    mbed::AnalogIn *_pot;

    mbed::Timeout *_timeout;

    std::bitset<N_EVENTS> _event_state; ///< A binary list of buttons that has been pressed

    // centred x,y values
    float _x0;
    float _y0;

public:

    /** Constructor */
    Gamepad();

    /** Destructor */
    ~Gamepad();

    /** Initialise all peripherals and configure interrupts */
    void init();

    /** Turn all LEDs on */
    void leds_on();

    /** Turn all LEDs off */
    void leds_off();

    /** Set all LEDs to duty-cycle
    *@param value in range 0.0 to 1.0
    */
    void leds(float val) const;

    /** Set LED to duty-cycle
    *@param led number (0 to 5)
    *@param value in range 0.0 to 1.0
    */
    void led(int n,float val) const;

    /** Read potentiometer
    *@returns potentiometer value in range 0.0 to 1.0
    */
    float read_pot() const;

    /** Play tone on piezo
    * @param frequency in Hz
    * @param duration of tone in seconds
    */
    void tone(float frequency, float duration);

    /**
     * @brief Check whether an event flag has been set and clear it
     * @param id[in] The ID of the event to test
     * @return true if the event occurred
     */
    bool check_event(GamepadEvent const id);

    /** Get varanitude of joystick movement
    * @returns value in range 0.0 to 1.0
    */

    float get_vara();

    /** Get angle of joystick movement
    * @returns value in range 0.0 to 359.9. 0.0 corresponds to N, 180.0 to S. -1.0 is central
    */
    float get_angle();

    /** Gets joystick direction
    * @returns an enum: CENTRE, N, NE, E, SE, S, SW, W, NW,
    */
    Direction get_direction();    // N,NE,E,SE etc.

    /** Gets raw cartesian co-ordinates of joystick
    * @returns a struct with x,y members, each in the range 0.0 to 1.0
    */
    Vector2D get_coord();         // cartesian co-ordinates x,y

    /** Gets cartesian coordinates mapped to circular grid
    * @returns a struct with x,y members, each in the range 0.0 to 1.0
    */
    Vector2D get_mapped_coord();  // x,y mapped to circle

    /** Gets polar coordinates of the joystick
    * @returns a struct contains vara and angle
    */
    Polar get_polar();            // vara and angle in struct form

private:
    void init_buttons();
    void tone_off();

    void a_isr();
    void b_isr();
    void x_isr();
    void y_isr();
    void l_isr();
    void r_isr();
    void back_isr();
    void start_isr();
    void joy_isr();
};

#endif