Code for this mini project

#include "mbed.h"
#include "uLCD_4DGL.h"
#include "SDFileSystem.h"
#include "wave_player.h"
#include "PinDetect.h"
#include <mpr121.h>

Serial pc(USBTX, USBRX);

uLCD_4DGL lcd(p9, p10, p8);
SDFileSystem sd(p5, p6, p7, p14, "sd"); //SD card

int key = 0;
int *keyptr = &key; 
int turn = 0;
int *turnptr = &turn;
char won = 'n';
char start = 'n';

//Speaker
AnalogOut DACout(p18);
wave_player waver(&DACout);

FILE *wave_file;
void drawerase()
{
    wave_file=fopen("/sd/erase16.wav","r");
    waver.play(wave_file);
    fclose(wave_file);
}
void drawcircle()
{
    wave_file=fopen("/sd/circle16.wav","r");
    waver.play(wave_file);
    fclose(wave_file);
}
void drawcross()
{
    wave_file=fopen("/sd/cross16.wav","r");
    waver.play(wave_file);
    fclose(wave_file);
}

//shift brite
DigitalOut latch(p15);
DigitalOut enable(p16);
SPI spi(p11, p12, p13);
void RGB_LED(int red, int green, int blue)
{
    unsigned int low_color=0;
    unsigned int high_color=0;
    high_color=(blue<<4)|((red&0x3C0)>>6);
    low_color=(((red&0x3F)<<10)|(green));
    spi.write(high_color);
    spi.write(low_color);
    latch=1;
    latch=0;
}
void winningLED()
{
    while(key!=4) {
        RGB_LED( 100, 0, 0);
        wait(.05);
        RGB_LED( 0, 100, 0);
        wait(.05);
        RGB_LED( 0, 0, 100);
        wait(.05);
    }
}
void tieLED()
{
    RGB_LED(100, 100, 100);
}

DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut myled4(LED4);

int pressed[12]={0};

//touch  pad
InterruptIn interrupt(p26);
// Setup the i2c bus on pins 9 and 10
I2C i2c(p28, p27);
// Setup the Mpr121:
// constructor(i2c object, i2c address of the mpr121)
Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);

// Key hit/release interrupt routine
void fallInterrupt() {
  int key_code=0;
  int i=0;
  int value=mpr121.read(0x00);
  value +=mpr121.read(0x01)<<8;
  // LED demo mod
  i=0;
  // puts key number out to LEDs for demo
  for (i=0; i<12; i++) {
  if (((value>>i)&0x01)==1) key_code=i+1;
  }
  myled4=key_code & 0x01;
  myled3=(key_code>>1) & 0x01;
  myled2=(key_code>>2) & 0x01;
  myled1=(key_code>>3) & 0x01;
  *keyptr = key_code;
  start = 'y';
}

void drawBKG()
{
    lcd.cls();
    lcd.background_color(0x254542);
    drawerase();
    lcd.line(2, 44, 126, 44, WHITE);
    lcd.line(2, 85, 126, 85, WHITE);
    lcd.line(44, 2, 44, 126, WHITE);
    lcd.line(85, 2, 85, 126, WHITE);
}

void winnercheck()
{
    if (pressed[3]==pressed[7]&&pressed[7]==pressed[11]&&pressed[3]!=0) {
        if(pressed[3]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[3]==2)   {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(23,23,107,23, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[2]==pressed[6]&&pressed[6]==pressed[10]&&pressed[2]!=0) {
        if(pressed[2]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[2]==2)     {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(23,65,107,65, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[1]==pressed[5]&&pressed[5]==pressed[9]&&pressed[1]!=0) {
        if(pressed[1]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[1]==2)    {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(23,107,107,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[3]==pressed[2]&&pressed[2]==pressed[1]&&pressed[3]!=0) {
        if(pressed[3]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[3]==2)   {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(23,23,23,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[7]==pressed[6]&&pressed[6]==pressed[5]&&pressed[7]!=0) {
        if(pressed[7]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[7]==2)    {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(65,23,65,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[11]==pressed[10]&&pressed[10]==pressed[9]&&pressed[11]!=0) {
        if(pressed[11]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[11]==2)    {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(107,23,107,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[3]==pressed[6]&&pressed[6]==pressed[9]&&pressed[3]!=0) {
        if(pressed[3]==1)   {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[3]==2)   {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(23,23,107,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[11]==pressed[6]&&pressed[6]==pressed[1]&&pressed[11]!=0) {
        if(pressed[11]==1)  {
            lcd.locate(4,0);
            lcd.printf("circle wins");
        } else if(pressed[11]==2)   {
            lcd.locate(5,0);
            lcd.printf("cross wins");
        }
        lcd.line(107,23,23,107, WHITE);
        won = 'w';
        winningLED();
    } else if (pressed[1]!=0 && pressed[2]!=0 &&pressed[3]!=0 && pressed[5]!=0 && pressed[6]!=0 && pressed[7]!=0 && pressed[9]!=0 && pressed[10]!=0 && pressed[11]!=0) {
        lcd.locate(7,0);
        lcd.printf("Tie");
        won = 'w';
        tieLED();
    }
}

void resetgame(){
    drawBKG();
    int i;
    for (i =0; i<=11;i++)pressed[i]=0;
    *turnptr = 0;
    won = 'n';
    RGB_LED(100,0,0);
    }
    
int main()
{   
    spi.format(16,0);
    spi.frequency(500000);
    enable=0;
    latch=0;
    
    interrupt.fall(&fallInterrupt);
    interrupt.mode(PullUp);

    //welcome
    lcd.baudrate(3000000);
    lcd.text_width(2);
    lcd.text_height(2);
    lcd.locate(0,2);
    lcd.text_mode(TRANSPARENT);
    lcd.color(WHITE);
    lcd.printf("   Tic\n   Tac\n   Toe");
    wait(3);
    lcd.cls();
    lcd.color(RED);
    lcd.printf("Use lower area of the keypad to draw a circle or cross\n\nKey 3 to reset the game\n\nLED indicates next player\n\nPress any key to continue...");
    while(start!='y') {
        wait(1);
    }
    
    lcd.cls();
    lcd.background_color(0x254542);
    resetgame();
    lcd.textbackground_color(0x254542);
    while (1) {
        if (key == 4) {
            resetgame();
        }
        else if (pressed[key]==0 && won == 'n') {
            if (key == 1) {
                if (turn == 0) {
                    lcd.circle(23, 107, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(18, 100, 28, 114, BLUE);
                    lcd.line(18, 114, 28, 100, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[1]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 2) {
                if (turn == 0) {
                    lcd.circle(23, 65, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(18, 58, 28, 72, BLUE);
                    lcd.line(18, 72, 28, 58, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[2]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 3) {
                if (turn == 0) {
                    lcd.circle(23, 23, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(18, 16, 28, 30, BLUE);
                    lcd.line(18, 30, 28, 16, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[3]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 5) {
                if (turn == 0) {
                    lcd.circle(65, 107, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(60, 100, 70, 114, BLUE);
                    lcd.line(60, 114, 70, 100, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[5]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 6) {
                if (turn == 0) {
                    lcd.circle(65, 65, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(60, 58, 70, 72, BLUE);
                    lcd.line(60, 72, 70, 58, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[6]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 7) {
                if (turn == 0) {
                    lcd.circle(65, 23, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(60, 16, 70, 30, BLUE);
                    lcd.line(60, 30, 70, 16, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[7]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 9) {
                if (turn == 0) {
                    lcd.circle(107, 107, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(102, 100, 112, 114, BLUE);
                    lcd.line(102, 114, 112, 100, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[9]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 10) {
                if (turn == 0) {
                    lcd.circle(107, 65, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(102, 58, 112, 72, BLUE);
                    lcd.line(102, 72, 112, 58, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[10]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            } else if (key == 11) {
                if (turn == 0) {
                    lcd.circle(107, 23, 10, RED);
                    drawcircle();
                    RGB_LED(0,0,100);
                } else if(turn == 1) {
                    lcd.line(102, 16, 112, 30, BLUE);
                    lcd.line(102, 30, 112, 16, BLUE);
                    drawcross();
                    RGB_LED(100,0,0);
                }
                pressed[11]=turn+1;
                *turnptr = (turn+1)%2;
                winnercheck();
            }
        }
    }
}