File content as of revision 2:aed0788e8f96:

#include "mbed.h"
#include "C12832.h"
#include "MMA7660.h"

AnalogIn potX(p20);
AnalogIn potY(p19);
MMA7660 acc(p28, p27);
C12832 lcd(p5, p7, p6, p8, p11);

DigitalIn play(p14);
DigitalIn up(p15);
DigitalIn down(p12);

static const int DOWN = 0;
static const int UP = 1;
static const int LEFTUP = 0;
static const int LEFTDOWN = 1;
static const int RIGHTUP = 2;
static const int RIGHTDOWN = 3;
static const int START = 4;
int badGuy = 12;
int badGuyState = DOWN;
int goodGuy;
int ballX;
int ballY;
int ballState = START;

void pong(void)
{
    while(1) {
        switch(badGuyState) {
            case DOWN:
                badGuy++;
                if (badGuy+5 >= lcd.height()-1)
                    badGuyState = UP;
                break;
            case UP:
                badGuy--;
                if (badGuy <= 0)
                    badGuyState = DOWN;
                break;
        }

        goodGuy -= up;
        goodGuy += down;
        if (goodGuy < 0)
            goodGuy = 0;
        if (goodGuy + 5 > lcd.width()-1)
            goodGuy = lcd.width()-6;

        switch(ballState) {
            case LEFTUP:
                ballX--;
                ballY--;
                if (ballX <= 0) {
                    if ((ballY >= badGuy) && (ballY <= badGuy+5))
                        ballState = RIGHTUP;
                    else
                        ballState = START;
                }
                if (ballY <= 0)
                    ballState = LEFTDOWN;
                break;
            case LEFTDOWN:
                ballX--;
                ballY++;
                if (ballX <= 0) {
                    if ((ballY >= badGuy) && (ballY <= badGuy+5))
                        ballState = RIGHTDOWN;
                    else
                        ballState = START;
                }
                if (ballY >= lcd.height()-1)
                    ballState = LEFTUP;
                break;
            case RIGHTUP:
                ballX++;
                ballY--;
                if (ballX >= lcd.width()-1) {
                    if ((ballY >= goodGuy) && (ballY <= goodGuy+5))
                        ballState = LEFTUP;
                    else
                        ballState = START;
                }
                if (ballY <= 0)
                    ballState = RIGHTDOWN;
                break;
            case RIGHTDOWN:
                ballX++;
                ballY++;
                if (ballX >= lcd.width()-1) {
                    if ((ballY >= goodGuy) && (ballY <= goodGuy+5))
                        ballState = LEFTDOWN;
                    else
                        ballState = START;
                }
                if (ballY >= lcd.height()-1)
                    ballState = RIGHTUP;
                break;
            case START:
                ballX = lcd.width()/2;
                ballY = 0;
                goodGuy = 12;
                if (play)
                    ballState = RIGHTDOWN;
                break;
        }

        // Draw stuff
        lcd.cls(); // clear screen
        lcd.circle(ballX, ballY, 2, 1);
        lcd.line(0, badGuy, 0, badGuy+5, 1);
        lcd.line(lcd.width()-1, goodGuy, lcd.width()-1, goodGuy+5, 1);
        lcd.copy_to_lcd();
        wait(0.02);
    }
}

void etchASketch()
{
    int counter = 0;
    while(1) {
        int x = (int)((1-potX) * lcd.width());
        int y = (int)((1-potY) * lcd.height());
        lcd.pixel(x, y, 1);
        lcd.copy_to_lcd();
        if (counter > 100) {
            if ((acc.x() > 1.3) || (acc.y() > 1.3))
                lcd.cls();
            counter = 0;
        }
        counter++;
    }
}

int main()
{
    int choice = 0;
    lcd.printf("\n    Etch-A-Sketch\n");
    lcd.printf("    Pong");
    while(1) {
        if (up)
            choice = 0;
        if (down)
            choice = 1;
        if (play) {
            lcd.cls();
            switch (choice) {
                case 0:
                    etchASketch();
                    break;
                case 1:
                    pong();
                    break;
            }
        }
        lcd.fillcircle(12,13+!choice*8,2,0);
        lcd.fillcircle(12,13+choice*8,2,1);
        lcd.copy_to_lcd();
    }
    //etchASketch();
    //pong();
}