File content as of revision 3:2d625f49afb9:

#include "mbed.h"
//#include "C12832_lcd.h"
#include "C12832.h"
#include "motion_detect.h"

#define N 200
#define LEFT 0
#define RIGHT 1
#define UP 2
#define DOWN 3

#define WIDTH 128
#define HEIGHT 32

#define WIDTH_MOD 32
#define HEIGHT_MOD 8

DigitalIn fire(p14);
BusIn joy(p15,p12,p13,p16);
static C12832 lcd(p5, p7, p6, p8, p11);
//static C12832_LCD lcd;
PwmOut spkr(p26);


int level = 1;
int score = 0;
bool acc_joy = true;

struct Food {
    int x;
    int y;
    int yes;
} food;

struct Snake {
    int x[N];
    int y[N];
    int node_num;
    int direction;
    int life;
} snake;

void generate_food() {
    food.x = rand() % WIDTH_MOD * 4;
    food.y = rand() % HEIGHT_MOD * 4;
}

bool check_joy() {
    if(joy == 0) {
        return false;
    }
    if(joy == 1) {
        if(snake.direction != DOWN) {
            snake.direction = UP;
        }
    }
    if(joy == 2) {
        if(snake.direction != UP) {
            snake.direction = DOWN;
        }
    }
    if(joy == 4) {
        if(snake.direction != RIGHT) {
            snake.direction = LEFT;
        }
    }
    if(joy == 8) {
        if(snake.direction != LEFT) {
            snake.direction = RIGHT;
        }
    }
    return true;
}

void game_play() {
    level = 1;
    score = 0;
    acc_joy = true;
    food.yes = 1;
    snake.life = 1;
    snake.direction = RIGHT;
    snake.x[0] = 72;
    snake.y[0] = 16;
    snake.x[1] = 68;
    snake.y[1] = 16;
    snake.x[2] = 64;
    snake.y[2] = 16;
    snake.node_num = 3;
    
    while(true) {
        if(fire) {
            acc_joy = !acc_joy;
        }
        if(acc_joy == false) {
            check_joy();
        }
        if(acc_joy == true) {
            motion_detect(snake.direction);
        }
        if(food.yes == 1) {
            generate_food();
            food.yes = 0;
        }
        lcd.fillrect(snake.x[snake.node_num - 1], snake.y[snake.node_num - 1], snake.x[snake.node_num - 1] + 3, snake.y[snake.node_num - 1] + 3, 0);
        if(food.yes == 0) {
            lcd.fillrect(food.x, food.y, food.x + 3, food.y + 3, 1);
        }        
        for(int i = snake.node_num - 1; i > 0; i--) {
            snake.x[i] = snake.x[i - 1];
            snake.y[i] = snake.y[i - 1];
        }
        switch(snake.direction) {
            case UP:
                snake.y[0] -= 4; break;
            case DOWN:
                snake.y[0] += 4; break;
            case LEFT:
                snake.x[0] -= 4; break;
            case RIGHT:
                snake.x[0] += 4; break;
        }
        for(int i = 3; i < snake.node_num; i++) {
            if(snake.x[i] == snake.x[0] && snake.y[i] == snake.y[0]) {
                snake.life = 0;
                break;
            }
        }
        
        if(snake.x[0] < 0 || snake.x[0] > 128 || snake.y[0] < 0 || snake.y[0] > 32 || snake.life == 0) {
            break;
        }
        
        if(snake.x[0] == food.x && snake.y[0] == food.y) {
            lcd.fillrect(food.x, food.y, food.x + 3, food.y + 3, 0);
            snake.x[snake.node_num] = -20;
            snake.y[snake.node_num] = -20;
            snake.node_num++;
            food.yes = 1;
            score += 10 * level;
            if(snake.node_num % 5 == 0) {
                level++;
            }
        }
        
        for(int i = 0; i < snake.node_num; i++) {
            lcd.fillrect(snake.x[i], snake.y[i], snake.x[i] + 3, snake.y[i] + 3, 1);
            lcd.rect(0,0,127,31,1);
        }
        
        wait(0.5 - 0.1 * level);
    }
}

int main() {
    validity();
    while(true) {
        game_play();
        lcd.cls();
        lcd.rect(0,0,127,31,1);
        lcd.locate(35,6);
        lcd.printf("GAME OVER");
        lcd.locate(16,16);
        lcd.printf("MOVE THE JOYSTICK");
        while(!check_joy() && !fire) {
            for (float i=2000.0; i<10000.0; i+=100) {
                if(check_joy() || fire) {
                    break;
                }
                spkr.period(1.0/i);
                spkr=0.5;
                wait(0.1);
            }
            spkr=0.0;
        }
        lcd.cls();
        lcd.rect(0,0,127,31,1);
        lcd.locate(35,6);
        lcd.printf("LENGTH: %d", snake.node_num);
        lcd.locate(35,16);
        lcd.printf("SCORE: %d", score);
               
        
        
        wait(3);
        lcd.cls();
    }
}