File content as of revision 0:56a82b52e0d4:

//Joystick Class - Implementation
#include "Joystick.h"
#include "mbed.h"

Joystick::Joystick(PinName x_axis_pin, PinName y_axis_pin, PinName button_pin) {
        x_axis_ = new AnalogIn(x_axis_pin);
        y_axis_ = new AnalogIn(y_axis_pin);
        button_ = new InterruptIn(button_pin);
        button_debounce_ = new Timeout();
}

Joystick::~Joystick() {
        delete x_axis_;
        delete y_axis_;
        delete button_;
        delete button_debounce_;
}

void Joystick::init() {
        //Sets up the button ISR
        button_->mode(PullDown);
        button_->rise(this, &Joystick::button_isr);

        //Initalises the vairables and flags
        x_offset_ = 0;
        y_offset_ = 0;
        g_button_flag_ = false;
        g_button_debounce_flag_ = false;

        //Samples the joystick 5 times and takes an average to get the offset
        float x_sum = 0;
        float y_sum = 0;

        for (int i = 0; i < 5; ++i) {
            x_sum += x_axis_->read();
            y_sum += y_axis_->read();
        }

        x_offset_ = 0.5f - x_sum/5.0f;
        y_offset_ = 0.5f - y_sum/5.0f;
}

float Joystick::GetXValue() {

        float x_sum = 0;
        //Iterates 5 times and calculates an average
        for (int i = 0; i < 5; ++i) {
            x_sum += x_axis_->read();
        }

        float x_value = x_sum/5.0f + x_offset_;

        //Caps the value for the POT between 0 and 1
        if (x_value < 0.0f) {
            return 0;
        } else if (x_value > 1.0f) {
            return 1;
        } else {
            return x_value;
        }
}

float Joystick::GetYValue() {

        float y_sum = 0;
        //Iterates 5 times and calculates an average
        for (int i = 0; i < 5; ++i) {
            y_sum += y_axis_->read();
        }

        float y_value = y_sum/5.0f + y_offset_;

        //Caps the value for the POT between 0 and 1
        if (y_value < 0.0f) {
            return 0;
        } else if (y_value > 1.0f) {
            return 1;
        } else {
            return y_value;
        }
}

int Joystick::get_button_flag() {
        return g_button_flag_;
}

void Joystick::set_button_flag(bool value) {
        g_button_flag_ = value;
}

void Joystick::button_isr() {
        if (!g_button_debounce_flag_) {
            g_button_flag_ = true;
            g_button_debounce_flag_ = true;

            //Sets up the debounce ticker to fire in 0.2s
            button_debounce_->attach(this, &Joystick::button_debounce_isr, 0.2);
        }
}

void Joystick::button_debounce_isr() {
        g_button_debounce_flag_ = false;
}