// By harsha
volatile unsigned char *opData = 0x31,*opCntrl = 0x108;

void setup() {
  // put your setup code here, to run once:
  volatile unsigned char *ddrData = 0x30,*ddrCntrl = 0x107;
  *ddrData = 0xFF;
  *ddrCntrl = 0xFF;

  setUpDisplay();
  writeString("Hello World");
}

void del(){
  volatile int i=0;
  for(i=0;i<100;i++);
}

void writeCntrl(unsigned char cmd){
  *opCntrl = (0x00);// enable low, RS is low
  *opData = cmd;
  del();
  *opCntrl = (*opCntrl | (0x02)); //enable is high
  del();
  *opCntrl = (0x00);// enable low, RS low
  del();
}

void writeData(unsigned char data){
  *opCntrl = (0x01);// enable low, RS is high
  *opData = data;
  del();
  *opCntrl = (*opCntrl | (0x02)); //enable is high
  del();
  *opCntrl = (0x01); // enable low
  del();
  *opCntrl = (0x00);// enable low, RS low
  del();
}

void setUpDisplay(){
  writeCntrl(0x01); // clear display
  writeCntrl(0x0F); // display on, cursor, cursor blink
  writeCntrl(0x06); // move cursor right
}

void writeString(char* s){
  for(int i=0;s[i];i++){
    writeData(s[i]);
  }
}
void loop() {
}