PONG game

main.c

// TFT module connections
char TFT_DataPort at PORTJ;
sbit TFT_RST at LATD3_bit;
sbit TFT_BLED at LATC2_bit;
sbit TFT_RS at LATE0_bit;
sbit TFT_CS at LATD2_bit;
sbit TFT_RD at LATH1_bit;
sbit TFT_WR at LATH2_bit;
char TFT_DataPort_Direction at TRISJ;
sbit TFT_RST_Direction at TRISD3_bit;
sbit TFT_BLED_Direction at TRISC2_bit;
sbit TFT_RS_Direction at TRISE0_bit;
sbit TFT_CS_Direction at TRISD2_bit;
sbit TFT_RD_Direction at TRISH1_bit;
sbit TFT_WR_Direction at TRISH2_bit;
// End TFT module connections

// Joysticks
sbit J1L_Direction at TRISE3_bit;
sbit J1R_Direction at TRISE6_bit;
sbit J2L_Direction at TRISE7_bit;
sbit J2R_Direction at TRISG2_bit;
sbit Start_Direction at TRISG1_bit;

void Init_MCU() {
  PLLEN_bit = 1;
  Delay_ms(150);
  WDTCON.B4 = 1;
  ANCON0 = 0xF0; // All pins to digital
  ANCON1 = 0xFF;
  WDTCON.B4 = 0;
  TFT_Set_Default_Mode();
  TP_TFT_Set_Default_Mode();
}

int paddleX, paddleY, oldPaddleX, oldPaddleY;
int ballDirectionX, ballDirectionY;
int ballX, ballY, oldBallX, oldBallY;
int paddleWidth;
int paddleHeight;
unsigned char is_in_paddle;
unsigned char count;
unsigned char max_count;

void Init_Game() {
 // Dark blue screen
 TFT_Fill_Screen(CL_NAVY);

 // Draw the walls
 TFT_Set_Pen(CL_AQUA, 1);
 TFT_H_Line(0, 320, 0);
 TFT_H_Line(0, 319, 1);
 TFT_H_Line(0, 319, 2);
 TFT_V_Line(0, 239, 0);
 TFT_V_Line(0, 239, 1);
 TFT_V_Line(0, 239, 2);
 TFT_V_Line(0, 239, 319);
 TFT_V_Line(0, 239, 318);
 TFT_V_Line(0, 239, 317);
 Delay_ms(100);
 // No borders
 TFT_Set_Pen(CL_NAVY, 0);
 Delay_ms(100);

 // Start with the ball somewhere in the middle
 ballX = 180;
 ballY = 50;
 oldBallX = 180;
 oldBallY = 180;
 ballDirectionX = 1;
 ballDirectionY = -1;

 // start the paddle also in the midle
 paddleX = 120;
 paddleY = 229;
 oldPaddleX = 120;
 oldPaddleY = 229;
 paddleWidth = 79;
 paddleHeight = 10;
 count = 0;
 max_count = 5;

 //Draw initial paddle
 TFT_Set_Brush(1, CL_WHITE, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
 TFT_Rectangle(paddleX, paddleY, paddleX + paddleWidth, paddleY + paddleHeight);
 Delay_ms(500);
}


// This function checks the position of the ball
// to see if it intersects with the paddle
// x and y are coordinates of ball center
// rectX and rectY are upper left coordinated of paddle
// rectWidth and rectHeight are paddle sizes
// void TFT_Rectangle(int x_upper_left, int y_upper_left, int x_bottom_right, int y_bottom_right);
unsigned char inPaddle(int x, int y, int rectX, int rectY, int rectWidth, int rectHeight) {
  unsigned char result;
  result = 0;
  if ((x >= (rectX-8)) &
      (x <= (rectX + rectWidth + 8)) &
      (y >= (rectY - 9)) &
      (y <= (rectY + rectHeight - 9))) {
    result = 1;
  }
  else {
  }
  return result;
}

// Note the ball radius is 8
// there are three pixels on top, left and right due to lines
void moveBall() {
  if ((ballX > 307) | (ballX < 12)) {
    ballDirectionX = - ballDirectionX;
  }
  if (ballY < 13) {
    ballDirectionY = - ballDirectionY;
  }
  if (ballY > 239){ // game lost
    TFT_Fill_Screen(CL_BLACK);
    TFT_Set_Font(TFT_defaultFont, CL_WHITE, FO_HORIZONTAL);
    TFT_Write_Text("GAME    OVER !", 110, 60);
    TFT_Write_Text("PRESS  START  TO  BEGIN  A  NEW  GAME", 50, 90);
    while(Button(&PORTG, 1, 1, 1) == 0);
    Init_Game();
  }
  is_in_paddle= inPaddle(ballX, ballY, paddleX, paddleY, paddleWidth, paddleHeight);
  if (is_in_paddle == 1) {
    ballDirectionY = - ballDirectionY;
    // Let's add some difficulty
    count++;
    if (count == max_count){
      count = 0;
      // Clear Paddle
      TFT_Set_Brush(1, CL_NAVY, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(paddleX, paddleY, paddleX + paddleWidth, paddleY + paddleHeight);
      paddleWidth = paddleWidth - 5;
      // If we don't take some precautions
      // The paddle will be smaller than the ball
      if (paddleWidth < 20){
        paddleWidth = 20;
      }
      // Redraw paddle
      TFT_Set_Brush(1, CL_WHITE, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(paddleX, paddleY, paddleX + paddleWidth, paddleY + paddleHeight);
    }
  }
  ballX += ballDirectionX;
  ballY += ballDirectionY;

  if ((oldBallX != ballX) | (oldBallY != ballY)) {
    // erase last ball position
    TFT_Set_Brush(1, CL_NAVY, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
    TFT_Circle(oldBallX, oldBallY, 8);
    // draw new ball
    TFT_Set_Brush(1, CL_WHITE, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
    TFT_Circle(ballX, ballY, 8);
  }
  oldBallX = ballX;
  oldBallY = ballY;
  Delay_us(40);
}

void MovePaddle(){
   // Is one of the buttons pressed?
   // Buttons are active high
   // Is left button pressed?
   if (Button(&PORTE, 3, 1, 1) | Button(&PORTE, 7, 1, 1)){
     PaddleX--;
     // Is the paddle out of the screen?
     if (PaddleX < 3){
       PaddleX = 3;
     }
     else{ // move paddle one position to the left
      // we add one rectangle of width 1 px and height paddleHeight to the left
      TFT_Set_Brush(1, CL_WHITE, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(paddleX, paddleY, oldPaddleX, paddleY + paddleHeight);
      // we clear one rectangle of width 1 px and height paddleHeight to the right
      TFT_Set_Brush(1, CL_NAVY, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(paddleX + paddleWidth, paddleY, oldPaddleX + paddleWidth, paddleY + paddleHeight);
     }
   }
   // Is right button pressed?
   if (Button(&PORTE, 6, 1, 1) | Button(&PORTG, 2, 1, 1)){
     PaddleX++;
     // Is the paddle out of the screen?
     if (PaddleX > (317 - paddleWidth)){
       PaddleX = 317 - paddleWidth;
     }
     else{
      // we add one rectangle of width 1 px and height paddleHeight to the right
      TFT_Set_Brush(1, CL_WHITE, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(oldPaddleX + paddleWidth, paddleY, paddleX + paddleWidth, paddleY + paddleHeight);
      // we clear one rectangle of width 1 px and height paddleHeight to the left
      TFT_Set_Brush(1, CL_NAVY, 0, LEFT_TO_RIGHT, CL_NAVY, CL_NAVY);
      TFT_Rectangle(oldPaddleX, paddleY, paddleX, paddleY + paddleHeight);
     }
   }
   oldPaddleX = PaddleX;
   oldPaddleY = PaddleY;
}

void main() {

 Init_MCU();

 // Set joystick buttons as inputs
 J1L_Direction = 1;
 J1R_Direction = 1;
 J2L_Direction = 1;
 J2R_Direction = 1;
 Start_Direction = 1;

 TFT_Init_ILI9341_8bit(320, 240);
 Delay_ms(100);

 Init_Game();

 // Let the game begin
 while(1){
   MovePaddle();
   MoveBall();
 }
}

PONG game

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