// EE 319K Intro Embedded Systems Game Design Project

// 2048 Game

// main.c

// Runs on LM4F120 or TM4C123

// Ryan Norton

// Graphic display on Kentec EB-LM4F120-L35

// Sound output to DAC

// Analog Input connected to PD2=ADC1 (1-D joystick),

//

// Switch input

#include "../inc/tm4c123gh6pm.h"

#include "SSD2119.h"

#include "PLL.h"

#include "sounds.h" // audio waveforms

#include "gameEngine.h" // 2048 game implementation details

#include "random.h"

#include "Input.h"

#include "DAC.h"

#include "sounds.h"

void delay(int instructions);

void EnableInterrupts(void);

void Timer2_Init(unsigned long period);

void Timer1_Init(unsigned long period);

unsigned long Button1;

unsigned long Button2;

unsigned int score;

unsigned int highscore = 0;

int pauseMode = 0;

int elapsedTime = 0;

int timeReady = 0;

int playSound = 0;

int soundIndex = 0;

int gameOver = 0;

int main(void) {int addScore, position, pauseSel;

// Initializations

PLL_Init(); // Clock set at 80 MHz

LCD_Init();

Board_Init();

Input_Init();

DAC_Init();

Random_Init(NVIC_ST_CURRENT_R);

Timer2_Init(80000000); // time interrupt

Timer1_Init(2000); // sound interrupt

EnableInterrupts();

generateRandomTile();

drawAllTiles();

writeScore(0);

writeHighscore(0);

writeTime(0);

displayHighestTile();

while(1){

// draw arrow if ready

if (arrowReady == 1){

// acknowledge flag

arrowReady = 0;

// draw arrow

drawArrow();

}

// write time if ready

if (timeReady == 1){

// acknowledge flag

timeReady = 0;

// write time

writeTime(elapsedTime);

}

// Play mode and button1 is pushed

if(Button1 && !pauseMode && !gameOver){

// Play sound

playSound = 1;

// shift and merge tiles towards arrow

position = getSliderPosition();

if (position == 1){

shiftLeft();

addScore = mergeLeft();

shiftLeft();

}

else if (position == 2){

shiftUp();

addScore = mergeUp();

shiftUp();

}

else if (position == 3){

shiftRight();

addScore = mergeRight();

shiftRight();

}

else {

shiftDown();

addScore = mergeDown();

shiftDown();

}

eraseBoard();

drawAllTiles();

// update score

score += addScore;

addScore = 0;

writeScore(score);

displayHighestTile();

// delay before adding new tile

delay(200);

// create new tile

if (countEmptyTiles() != 0){

generateRandomTile();

}

drawAllTiles();

// update highest tile image

displayHighestTile();

// check if game over

if (checkGameOver() == 1){

gameOver = 1;

}

// unset flag

Button1 = 0;

}

// button 2 is pause

else if (Button2 && !gameOver && !pauseMode){

pauseMode = 1;

pauseSel = 0;

// disable arrow and timer

NVIC_ST_CTRL_R = 0;

TIMER2_CTL_R = 0x00000000;

LCD_DrawFilledRect(prevX,prevY,20,20,BLACK);

// draw pause mode screen

drawPauseMode();

// acknowledge button

Button2 = 0;

// wait until button is pushed

while (pauseMode){

// Button 1 selects current pause selection button

if (Button1){

// acknowledge button

Button1 = 0;

Button2 = 0;

pauseMode = 0;

// if pause selection = "continue" (pauseSel = 0), continue with game

if (pauseSel == 0){

// redraw screen

eraseBoard();

drawAllTiles();

// enable gameplay

NVIC_ST_CTRL_R = 0x07;

TIMER2_CTL_R = 0x00000001;

}

// if pause selection = "restart" (pauseSel = 0), end game

else if (pauseSel == 1){

if (score > highscore){

writeHighscore(score);

}

score = 0;

eraseScore();

writeScore(0);

clearBoard();

eraseBoard();

pauseMode = 0;

generateRandomTile();

drawAllTiles();

elapsedTime = 0;

eraseTime();

writeTime(0);

displayHighestTile();

NVIC_ST_CTRL_R = 0x07;

TIMER2_CTL_R = 0x00000001;

}

}

// Button 2 changes pause selection

else if (Button2){

Button2 = 0;

if (pauseSel == 0){

pauseSel = 1;

LCD_DrawRect(144,112,58,16,BLACK);

LCD_DrawRect(222,112,51,16,WHITE);

}

else if (pauseSel == 1){

pauseSel = 0;

LCD_DrawRect(222,112,51,16,BLACK);

LCD_DrawRect(144,112,58,16,WHITE);

}

}

}

}

// game over

if (gameOver == 1){

NVIC_ST_CTRL_R = 0;

TIMER2_CTL_R = 0x00000000;

LCD_DrawFilledRect(156,38,100,20,BLACK);

LCD_SetTextColor(255,255,240);

LCD_Goto(30,5);

printf("GAME OVER");

while (Button1 == 0 && Button2 == 0) {}

Button1 = 0;

Button2 = 0;

LCD_DrawFilledRect(prevX,prevY,20,20,BLACK);

drawGameOver(score, elapsedTime);

if (score > highscore){

writeHighscore(score);

gameOverHighscore(score);

}

// wait til button is pushed

while (Button1 == 0 && Button2 == 0){}

// acknowledge buttons

Button1 = 0;

Button2 = 0;

// start new game

score = 0;

eraseScore();

writeScore(0);

clearBoard();

eraseBoard();

pauseMode = 0;

generateRandomTile();

drawAllTiles();

elapsedTime = 0;

eraseTime();

writeTime(0);

displayHighestTile();

NVIC_ST_CTRL_R = 0x07;

TIMER2_CTL_R = 0x00000001;

// finish game over mode

gameOver = 0;

}

}

}

void delay(int ms){unsigned int i;

for (i=ms*8000; i>0; i--){}

}

void Timer2_Init(unsigned long period){

unsigned long volatile delay;

SYSCTL_RCGCTIMER_R |= 0x04; // 0) activate timer2

delay = SYSCTL_RCGCTIMER_R;

TIMER2_CTL_R = 0x00000000; // 1) disable timer2A during setup

TIMER2_CFG_R = 0x00000000; // 2) configure for 32-bit mode

TIMER2_TAMR_R = 0x00000002; // 3) configure for periodic mode, default down-count settings

TIMER2_TAILR_R = period-1; // 4) reload value

TIMER2_TAPR_R = 0; // 5) bus clock resolution

TIMER2_ICR_R = 0x00000001; // 6) clear timer2A timeout flag

TIMER2_IMR_R = 0x00000001; // 7) arm timeout interrupt

NVIC_PRI5_R = (NVIC_PRI5_R&0x00FFFFFF)|0x80000000; // 8) priority 4

NVIC_EN0_R |= 1<<23; // 9) enable IRQ 23 in NVIC

TIMER2_CTL_R = 0x00000001; // 10) enable timer2A

}

void Timer1_Init(unsigned long period){

unsigned long volatile delay;

SYSCTL_RCGCTIMER_R |= 0x02; // 0) activate timer1

delay = SYSCTL_RCGCTIMER_R;

TIMER1_CTL_R = 0x00000000; // 1) disable timer1A during setup

TIMER1_CFG_R = 0x00000000; // 2) configure for 32-bit mode

TIMER1_TAMR_R = 0x00000002; // 3) configure for periodic mode, default down-count settings

TIMER1_TAILR_R = period-1; // 4) reload value

TIMER1_TAPR_R = 0; // 5) bus clock resolution

TIMER1_ICR_R = 0x00000001; // 6) clear timer3A timeout flag

TIMER1_IMR_R = 0x00000001; // 7) arm timeout interrupt

NVIC_PRI5_R = (NVIC_PRI5_R&0x00FFFFFF)|0x80000000; // 8) priority 4

NVIC_EN0_R |= 1<<21; // 9) enable IRQ 35 in NVIC

TIMER1_CTL_R = 0x00000001; // 10) enable timer1A

}

void Timer2A_Handler(void){

TIMER2_ICR_R = 0x00000001; // acknowledge timer2A timeout

elapsedTime ++;

timeReady = 1;

}

void Timer1A_Handler(void){

TIMER1_ICR_R = 0x00000001; // acknowledge timer1A timeout

if (playSound == 1){

if (soundIndex < 982){

DAC_Out(fastinvader1[soundIndex]);

soundIndex ++;

}

else{

soundIndex = 0;

playSound = 0;

}

}

}

void GPIOPortC_Handler(void){

GPIO_PORTC_ICR_R = 0x20; // acknowledge flag 5

delay(100);

Button1 = 1; // trigger

}

void GPIOPortD_Handler(void){

GPIO_PORTD_ICR_R = 0x40; // acknowledge flag 3

delay(100);

Button2 = 1; // trigger

}