File content as of revision 0:1c3f3fe862f2:

#include "mbed.h"
#include "N5110.h"
#define DIRECTION_TOLERANCE 0.05

BusOut LEDS(LED4,LED3,LED2,LED1);
BusOut myleds(p24,p23,p22); //External LEDS
InterruptIn StartButton(p18);//Start button
N5110 lcd(p7,p8,p9,p10,p11,p13,p26); //PWR, SCE, RST, DC, MOSI, SCLK, LED
AnalogIn Bright(p20);//Pot to adjust brightness
Ticker timer; //Create ticker object
DigitalIn button(p17);// Joystick Button
AnalogIn xPot(p15);// Joystick x-direction
AnalogIn yPot(p16);// Joystick y-direction
int i=42;
int j = 24;
int printFlag = 0;
Ticker pollJoystick; // timer to regularly read the joystick
enum DirectionName { // create enumerated type (0,1,2,3 etc. for direction)
    UP,         // could be extended for diagonals etc.
    DOWN,
    LEFT,
    RIGHT,
    CENTRE,
    UNKNOWN
};

typedef struct JoyStick Joystick; // struct for Joystick
struct JoyStick {
    float x;    // current x value
    float x0;   // 'centred' x value
    float y;    // current y value
    float y0;   // 'centred' y value
    int button; // button state (assume pull-down used, so 1 = pressed, 0 = unpressed)
    DirectionName direction;  // current direction
};

Joystick joystick; // create struct variable


void calibrateJoystick() // read default positions of the joystick to calibrate later readings
{
    button.mode(PullDown);
    // must not move during calibration
    joystick.x0 = xPot;  // initial positions in the range 0.0 to 1.0 (0.5 if centred exactly)
    joystick.y0 = yPot;
}

void updateJoystick()
{

    joystick.x = xPot - joystick.x0; // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
    joystick.y = yPot - joystick.y0;
    joystick.button = button; // read button state

    // calculate direction depending on x,y values
    // tolerance allows a little lee-way in case joystick not exactly in the stated direction
    if ( fabs(joystick.y) < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = CENTRE;
    } else if ( joystick.y > DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = UP;
    } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = DOWN;
    } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = RIGHT;
    } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = LEFT;
    } else {
        joystick.direction = UNKNOWN;
    }


    printFlag = 1; // set flag for printing
}

void drawMap1()// Furthest Left  Map
{

    lcd.drawRect(0,0,1,48,1);   //x-coordinate of origin (top-left),y-coordinate of origin (top-left),width , height ,0 transparent (w/outline), 1 filled black, 2 filled white (wo/outline)
    lcd.drawRect(0,0,84,1,1);
    lcd.drawRect(0,46,84,1,1);
}

void drawMap2()// Central Map
{
    lcd.drawRect(0,0,84,1,1);
    lcd.drawRect(0,46,84,1,1);
}

void drawMap3()// Furthest Right  Map
{

    lcd.drawRect(82,0,1,48,1);   //x-coordinate of origin (top-left),y-coordinate of origin (top-left),width , height ,0 transparent (w/outline), 1 filled black, 2 filled white (wo/outline)
    lcd.drawRect(0,0,84,1,1);
    lcd.drawRect(0,46,84,1,1);
}

int main()
{
    lcd.init();


    calibrateJoystick();  // get centred values of joystick
    pollJoystick.attach(&updateJoystick,1.0/20.0);  // read joystick 10 times per second

    while(1) {
        lcd.clear();
        drawMap2(); // Furthest Left
        lcd.drawCircle(i,j,2,1); //x-coordinate of origin (top-left),y-coordinate of origin (top-left),width , height ,0 transparent (w/outline), 1 filled black, 2 filled white (wo/outline)


        // check joystick direction
        if (joystick.direction == UP) {
            j--;
        }
        if (joystick.direction == DOWN) {
            j++;
        }
        if (joystick.direction == LEFT) {
            i--;
        }
        if (joystick.direction == RIGHT) {
            i++;
        }
        if (i<4) {
            i=4;
        }
        if (j<4) {
            j=4;
        }
        if (j>43) {
            j=43;
        }
    }
}