int oldValue=0;
int lastButtonState = 0;
int value=0;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
volatile char *ddir;
ddir=0x30;
*ddir&=~(1<<DDF0);//setting it as input pin
volatile char *dir;
dir=0x21;
*dir=0xFF;
}
void one(volatile char *out){
  unsigned char digits[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int bite;
  for(bite=0;bite<10;bite++){
  *out=digits[bite];
  delay(1000);
  }
}
void two(volatile char *out){
   unsigned char digits_with_dp[] = {
    0xBF, // 0 with DP
    0x86, // 1 with DP
    0xDB, // 2 with DP
    0xCF, // 3 with DP
    0xE6, // 4 with DP
    0xED, // 5 with DP
    0xFD, // 6 with DP
    0x87, // 7 with DP
    0xFF, // 8 with DP
    0xEF  // 9 with DP
  };
  for (unsigned int bite=0;bite<10;bite++) {
    *out = digits_with_dp[bite];
    delay(1000);
  }
}
void three(volatile char *out){
  unsigned char digits[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int i;
  for(i=0;i<10;i++){
    if(i%2==0){
      *out=digits[i];
      delay(1000);
    }
  }
}
void four(volatile char *out){
  unsigned char digits[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int i;
  for(i=0;i<10;i++){
    if(i%2!=0){
      *out=digits[i];
      delay(1000);
    }
  }
}
void five(volatile char *out){
  unsigned char alphabet[] = {
    0x77, // A
    0x7C, // b
    0x39, // C
    0x5E, // d
    0x79, // E
    0x71, // F
    0x3D, // G
    0x76, // H
    0x06, // I
    0x0E, // J
    0x38, // L
    0x54, // n
    0x3F, // O
    0x73, // P
    0x67, // q
    0x50, // r
    0x6D, // S
    0x78, // t
    0x3E, // U
    0x6E, // Y
    0x5B  // Z
  };
  unsigned int i;
  for(i= 0;i<sizeof(alphabet);i++) {
    *out=alphabet[i];
    delay(1000);
  }
}
void six(volatile char *out){
  unsigned char digits[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int bite,j;
  volatile int c;
  for(bite=2;bite<10;bite++){
    c=0;
    for(j=2;j<bite;j++){
    if(bite%j==0){
    c++;
    break;
    }
    }
    if(c==0)
    {
      *out=digits[bite];
        delay(500);
    }
}
}
void seven(volatile char *out){
  unsigned char values[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int i,dig;
  unsigned int digit=192;
    dig=digit%10;
        *out=values[dig];
}
void eight(volatile char *out){
  unsigned char values[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  unsigned int i,dig;
  unsigned int digit=9932;
    while(digit!=0){
      dig=digit%10;
      digit=digit/10;
    }
    *out=values[dig];
    }
  void nine(volatile char *out){
    unsigned char values[]={
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
  };
  *out=values[0];
  delay(500);
  *out=values[2];
  delay(500);
  *out=values[4];
  delay(500);
  *out=values[6];
  delay(500);
  *out=values[8];
  delay(500);
  *out=values[9];
  delay(500);
  *out=values[7];
  delay(500);
  *out=values[5];
  delay(500);
  *out=values[3];
  delay(500);
  *out=values[1];
  delay(500);
  }
void loop() {
// put your main code here, to run repeatedly:
 int buttonState=(PINF&(1<<PINF0));//reading from pinA0
 //or
 //int buttonState=(PINF&(1<<PINF0));
    if (buttonState!=oldValue){
      oldValue=buttonState;
      if (oldValue==1){
        Serial.println("The button pressed is:");
        value++;
        Serial.println(value);
        if(value>=9) {
          value=1;
        }
        volatile char *out;
        out = 0x22;
switch(value){
  case 1:
  one(out);
  break;
  case 2:
  two(out);
  break;
  case 3:
  three(out);
  break;
  case 4:
  four(out);
  break;
  case 5:
  five(out);
  break;
  case 6:
  six(out);
  break;
  case 7:
  seven(out);
  break;
  case 8:
  eight(out);
  break;
  case 9:
  nine(out);
  break;
  default:
  break;
}
}
else {
      Serial.println("The button is released.");
    }
  }
}