void port_init(){
  volatile unsigned char *portb_dir=0x24;
  volatile unsigned char *portc_dir=0x27;
  *portb_dir=0xFF;
  *portc_dir=0xFF;
}

void outputb(unsigned char data1)
{
  volatile unsigned char *portb_data=0x25;
  *portb_data=data1;
}
void outputc(unsigned char data2)
{
  volatile unsigned char *portc_data=0x28;
  *portc_data=data2;
}
void clockpulse()
{
  outputc(0x01);
  delayMicroseconds(500);
  outputc(0x00);
  delayMicroseconds(500);
}
void latch()
{
  outputb(0x02);
  delayMicroseconds(500);
  outputb(0x00);
}
void shift_out(unsigned char address,unsigned char data)
{
  int i;
  for(i=0;i<16;i++)
  {
    if(i<8)
    {
      outputb(((address<<i)&0x80)>>7);
    }
    else{
      outputb(((data<<i-8)&0x80)>>7);
    }
    clockpulse();
  }
}






void setup() {
  port_init();
  byte a[8] = {
  0x3C,  // 00111100  
  0x42,  // 01000010  
  0xA5,  // 10100101  (Eyes)  
  0x81,  // 10000001  
  0xA5,  // 10100101  
  0x99,  // 10011001  (Smile Curve)  
  0x42,  // 01000010  
  0x3C   // 00111100  
};


for(int i=0;i<=7;i++){
    shift_out(i,a[i]);
    latch();
  }

  



  

  









 /* delay(2000);
  for(int i=0;i<=7;i++){
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);

    delay(10);
    latch();
   }
 
  }*/
}

  
  
  
  



void loop() {
  // put your main code here, to run repeatedly:

}




















/*int arrd[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
  int arrd2[]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};

  //int arrd[]={0x10,0x30,0x50,0x10,0x10,0x10,0x10,0x7C}; digit 1
  //int arr2[]={0x38,0x44,0x04,0x04,0x08,0x10,0x20,0x7E}; digit 2

  //int arrs[] = {0x7C, 0x40, 0x40, 0x78, 0x04, 0x04, 0x7C, 0x00};
  //int arrb[] = {0x7C, 0x44, 0x44, 0x78, 0x44, 0x44, 0x7C, 0x00};


  int arrE[] = {0x7C, 0x40, 0x40, 0x78, 0x40, 0x40, 0x7C, 0x00};
  int arrT[] = {0x7C, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00};
  int arrA[] = {0x18, 0x24, 0x24, 0x3C, 0x24, 0x24, 0x24, 0x00};
  int arrL[] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x7C, 0x00};

   int arr1[] = {0x18, 0x38, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00};
   int arr2[] = {0x3C, 0x66, 0x06, 0x0C, 0x18, 0x30, 0x7E, 0x00};
   int arr3[] = {0x3C, 0x66, 0x06, 0x1C, 0x06, 0x66, 0x3C, 0x00};
   int arr4[] = {0x0C, 0x1C, 0x2C, 0x4C, 0x7E, 0x0C, 0x0C, 0x00};*/




// to display the text from right side.
/*for(int i=0;i<=7;i++){
    shift_out(arr[i],arrE[i]);
    latch();
  }
  delay(2000);
  for(int i=0;i<=7;i++){
    
    shift_out(arr[i],arrE[i]);
    shift_out(arr[i],arrT[i]);

    latch();
  }
  delay(1000);
  for(int i=0;i<=7;i++){
    
    shift_out(arr[i],arrE[i]);
    shift_out(arr[i],arrT[i]);
    shift_out(arr[i],arrA[i]);

    latch();
  }
  delay(1000);
  for(int i=0;i<=7;i++){
    
    shift_out(arr[i],arrE[i]);
    shift_out(arr[i],arrT[i]);
    shift_out(arr[i],arrA[i]);
    shift_out(arr[i],arrL[i]);

    latch();
  }
  delay(1000);




  int arr[]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};
  int arr1[] = {0x18, 0x38, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00};
   int arr2[] = {0x3C, 0x66, 0x06, 0x0C, 0x18, 0x30, 0x7E, 0x00};
   int arr3[] = {0x3C, 0x66, 0x06, 0x1C, 0x06, 0x66, 0x3C, 0x00};
   int arr4[] = {0x0C, 0x1C, 0x2C, 0x4C, 0x7E, 0x0C, 0x0C, 0x00};

  while(1){
  for(int i=0;i<=7;i++){
    shift_out(arr[i],arr1[i]);
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);

    latch();
  }
  delay(1000);
  for(int i=0;i<=7;i++){
    shift_out(arr[i],arr1[i]);
    shift_out(arr[i],arr2[i]);
    shift_out(arr[i],0x00);
    shift_out(arr[i],0x00);

    latch();
  }
  delay(1000);
  for(int i=0;i<=7;i++){
    shift_out(arr[i],arr1[i]);
    shift_out(arr[i],arr2[i]);
    shift_out(arr[i],arr3[i]);
    shift_out(arr[i],0x00);

    latch();
  }
  delay(1000);
  for(int i=0;i<=7;i++){
    shift_out(arr[i],arr1[i]);
    shift_out(arr[i],arr2[i]);
    shift_out(arr[i],arr3[i]);
    shift_out(arr[i],arr4[i]);

    latch();
  }
  delay(1000);*/