File content as of revision 5:d8a06e7c54fb:

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


//pins in
N5110 lcd(p7,p8,p9,p10,p11,p13,p26);

// connections for joystick
DigitalIn button(p17);
//DigitalIn button1(p19);
AnalogIn xPot(p15);
AnalogIn yPot(p16);
PwmOut buzzer(p21);
PwmOut blacklight(p26);
PwmOut led1(p24);
PwmOut led2(p23);

int i;
int j;
int X;
int Y;
char buffer[14];

int snakeX[100];
int snakeY[100];

// timer to regularly read the joystick
Ticker pollJoystick;
// Serial for debug
Serial serial(USBTX,USBRX);

// create enumerated type (0,1,2,3 etc. for direction)
// could be extended for diagonals etc.
enum DirectionName {
    UP,
    DOWN,
    LEFT,
    RIGHT,
    CENTRE,
    UNKNOWN
};

// struct for Joystick
typedef struct JoyStick 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
};
// create struct variable
Joystick joystick;

int buttonFlag = 0;
int printFlag = 0;
int nutFlag =1;
int lifeFlag =0;
float frequency[]={659,554,659,554,550,494,554,587,494,659,554,440};
float beat[]={1,1,1,1,1,0.5,0.5,1,1,1,1,2};
//int buttonFlag = 0;
// function prototypes
//void setPixel(int x, int y);
//void clearPixel(int x, int y);


typedef struct Nut Nut;
struct Nut {
    int X;
    int Y;
    int yes;
};
Nut nut;

typedef struct Snake Snake;
struct Snake {
    int snakeX[100];
    int snakeY[100];
    int node;
    int life;
    DirectionName direction;
};
Snake snake;

DirectionName snakeDirection;

void initNut()
{
    nut.X=rand()%84;
    nut.Y=rand()%48;
    //nutFlag=1;
    }
   
void drawNut()
{
    //int X = rand()%84;
    //int Y = rand()%48;
    if(nutFlag==1){
    lcd.drawCircle(nut.X,nut.Y,1,1);
    }
}

void moveSnake()
{
  
    if(joystick.direction == CENTRE){
        //snake.snakeX[0]+=1;
        joystick.direction = CENTRE;
    }
    //else if(joystick.button == button){
      //  snake.snakeX[i]=snake.snakeX[i];
       // snake.snakeY[i]=snake.snakeY[i];
       // }
    else if(joystick.direction == UNKNOWN){
           joystick.direction = UNKNOWN;
           }
    else if(joystick.direction != UNKNOWN&&joystick.direction != CENTRE) {

        if((joystick.direction == DOWN)&&(snake.direction!=LEFT)) {
            snake.direction= RIGHT;
            //snake.snakeX[0]+=1;
   
        } else if((joystick.direction == UP)&&(snake.direction!=RIGHT)) {
            snake.direction=LEFT;
            //snake.snakeX[0]-=1;
        } else if((joystick.direction == LEFT)&&(snake.direction!=DOWN)) {
            snake.direction=UP;
            //snake.snakeY[0]-=1;
        } else if((joystick.direction == RIGHT)&&(snake.direction!=UP)) {
            snake.direction=DOWN;
            //snake.snakeY[0]+=1;
        }

    }
    
}

void initSnake()
{
    
    snake.snakeX[0] = 16; //coordinate of head
    snake.snakeY[0] = 10;
    snake.snakeX[1] = 14;
    snake.snakeY[1] = 10;
    snake.snakeX[2] = 12;
    snake.snakeY[2] = 10;
    snake.snakeX[3] = 10;
    snake.snakeY[3] = 10;
    snake.node = 6; //node of snake
    snake.direction = RIGHT;
      
}


void drawSnake()
{   
    
     for(i=0; i<snake.node-1; i++) {
        lcd.drawCircle(snake.snakeX[i],snake.snakeY[i],1,1);
        //lcd.setPixel(snake.snakeX[i],snake.snakeY[i]);
    } 
    
}

/*
*/

void startGmae()
{
    //lcd.drawRect(snake.snakeX[0]+10,snake.snakeY[0]+10,10,10,1);
    //nutFlag = 1;
    //lifeFlag = 0;
    //snake.direction=LEFT;
    //if(joystick.direction == UNKNOWN)
    
    if((snake.snakeX[0]==nut.X)&&(snake.snakeY[0]==nut.Y)||(snake.snakeX[0]==nut.X-1)&&(snake.snakeY[0]==nut.Y-1)||(snake.snakeY[0]==nut.Y+1)&&(snake.snakeY[0]==nut.Y+1)) { // if snake got nut
        snake.node++;
        
               //buzzer.period(1/659); // set PWM period
               //buzzer=0.1; // set duty cycle
               //wait(0.1);
        nutFlag=0;   // new nut appear
    }
    
    if(nutFlag==0) { //set nut randomly
        nut.X = rand()%83;
        nut.Y = rand()%47;
        nutFlag = 1;
    }

    
       for(i=3; i<snake.node; i++) { //if snake collide itself snake die
           if(snake.snakeX[i]==snake.snakeX[0] && snake.snakeY[i]==snake.snakeY[0]) {
               lifeFlag=1;
               // break;
           }      
      }
     
        for(i=snake.node-1; i>0; i--) { //move snake
           if(snake.snakeX[0]>1||snake.snakeX[0]<83||snake.snakeY[0]>1||snake.snakeY[0]<47){   
           snake.snakeX[i]=snake.snakeX[i-1];
           snake.snakeY[i]=snake.snakeY[i-1];
           }
           else{
               snake.snakeX[i]=snake.snakeX[i];
               snake.snakeY[i]=snake.snakeY[i];
           }
          }
     

    if(snake.snakeX[0]<1||snake.snakeX[0]>83||snake.snakeY[0]<1||snake.snakeY[0]>47) {
        lifeFlag=1; // snake collide the corrider snake die
        //break;
    }


    //if(snake.life==1) {
        //break;
    //}
    
    

}

void printScore(){
    lcd.printString("YourScoreis",0,0);
    int score=snake.node-5;
    int length = sprintf(buffer,"\n SCORE=%2d \n",score);
    }
/*  
void buttonPressed(){
    buttonFlag=1;
    }
*/
//while(joystick.direction == UNKNOWN) {


//switch(snake.direction)
//{
// case RIGHT:snake.X[0]+=1;
//  break;    
//  case LEFT:snake.X[0]-=1;
//  break;     
//  case UP:snake.Y[0]-=1;
//  break;
//   case DOWN:snake.Y[0]+=1;
//  break;
// }

//end of while(joystick.direction = UNKNOWN)


// if(joystick.direction == UP&&snake.direction!=DOWN) {
//    snake.direction=UP;
// } else if(joystick.direction == RIGHT&&snake.direction!=LEFT) {
//     snake.direction= RIGHT;
// } else if(joystick.direction == LEFT&&snake.direction!=RIGHT) {
//     snake.direction=LEFT;
//  } else(joystick.direction == DOWN&&snake.direction!=UP) {
//     snake.direction=DOWN;
//  }



// read default positions of the joystick to calibrate later readings
void calibrateJoystick()
{
    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()
{
    // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
    joystick.x = xPot - joystick.x0;
    joystick.y = yPot - joystick.y0;
    // read button state
    joystick.button = button;

    // 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;
        //LED OFF
    } else if ( joystick.y > DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = UP;
        //LIGHT LED1
        //snake.direction = UP;
    } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = DOWN;
        //LIGHT LED2
    } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = RIGHT;
        //LIGHT LED3
    } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = LEFT;
    } else {
        joystick.direction = UNKNOWN;
    }
    // set flag for printing
    printFlag = 1;
}

void updateSnake()
{
    // get direction of joystick and update snake
    if (snake.direction == LEFT) {
        snake.snakeX[0]--;
        //LED1
        if(snake.snakeX[0]<1) {
            snake.snakeX[0]=1;
            
        }//will stop at the top edge

    }
    if (snake.direction == RIGHT) {
        snake.snakeX[0]++;
        //LED2
        if(snake.snakeX[0]>83) {
            snake.snakeX[0]=83;
        }//will stop at the bottom edge
    }
    if (snake.direction == UP) {
        snake.snakeY[0]--;
        if(snake.snakeY[0]>47) {
            snake.snakeY[0]=47;
        }//will stop at the left edge

    }
    if (snake.direction == DOWN) {
        snake.snakeY[0]++;
        if(snake.snakeY[0]<1) {
            snake.snakeY[0]=1;
        }//will stop at the right edge

    }
    if(snake.direction == CENTRE){
        snake.snakeX[0]+=1;
        }
    if(snake.direction == UNKNOWN){
        snake.snakeX[0]+=1;
        }
}



//main code
int main()
{
    lcd.init();
    lcd.setBrightness(0.5); // put LED backlight on 50%
    //button.rise(&buttonPressed);
    calibrateJoystick();  // get centred values of joystick
    pollJoystick.attach(&updateJoystick,1.0/10.0);  // read joystick 10 times per second
    lcd.refresh();
    initNut();
    initSnake();
    //buzzer.period(0.020);   // a 20ms period
    lcd.printString("press to start",0,0);
           

    //printScore();

//infinite while loop
    while(1) {
       
     //if(button){
        lcd.clear();
        lifeFlag=0;
        updateSnake();
        drawSnake();
        drawNut();
        moveSnake();
        startGmae();
          if(lifeFlag==1){
           lcd.clear();
           lcd.refresh();
           //lcd.printString("press to start",0,0);
           printScore();
           lifeFlag=0;
           }
          lcd.refresh();
          wait(0.1);      
       }
       //else
       //lcd.printString("press to start",20,20);
   // }
    //wait(0.5);
    //if(snake.life==1) {
    // lcd.printString("lost",24,42);
    // break;


}