#include <stdio.h>
#include <string.h>

#define rs 22
#define en 23
#define D7 2
#define D6 4
#define D5 5
#define D4 18
void sendDataUpper(unsigned char value){
  digitalWrite(D4,(value >> 0) & 1);
  digitalWrite(D5,(value >> 1) & 1);
  digitalWrite(D6,(value >> 2) & 1);
  digitalWrite(D7,(value >> 3) & 1);

}
void sendDataLower(unsigned char value){
  digitalWrite(D4,(value >> 4) & 1);
  digitalWrite(D5,(value >> 5) & 1);
  digitalWrite(D6,(value >> 6) & 1);
  digitalWrite(D7,(value >> 7) & 1);

}
void cmd(unsigned char value){
  sendDataUpper(value);

  digitalWrite(rs, LOW);
  digitalWrite(en, HIGH);
  delay(10);
  digitalWrite(rs, LOW);
  digitalWrite(en, LOW);
  delay(200);

  sendDataLower(value);
  digitalWrite(en, HIGH);
  delay(1);
  digitalWrite(en, LOW);
  delay(2);
}

void dat(unsigned char value){
  sendDataUpper(value);
  digitalWrite(rs, HIGH);
  digitalWrite(en, HIGH);
  delay(10);
  digitalWrite(rs, HIGH);
  digitalWrite(en, LOW);
  delay(200);

  sendDataLower(value);
  digitalWrite(en, HIGH);
  delay(1);
  digitalWrite(en, LOW);
  delay(2);
}

void lcd_init(){
  delay(20);
  cmd(0x33);
  cmd(0x32);    // send 4 bit 
  cmd(0x28);    /* 2 line, 5*7 matrix in 4-bit mode */
  cmd(0x0c);    /* Display on cursor off*/ 
  cmd(0x06);    /* Increment cursor (shift cursor to right)*/
  cmd(0x01);    /* Clear display screen*/
  delay(2);
}

void str(char *disp){
  int i;
  for (i = 0; disp[i] != '\0'; i++) /* Send each char of string till the NULL */
  {
    dat (disp[i]);
    delay(30);
  }
}
void setup() {
  // put your setup code here, to run once:
  pinMode(rs, OUTPUT);
  pinMode(en, OUTPUT);
  pinMode(D7, OUTPUT);
  pinMode(D6, OUTPUT);
  pinMode(D5,OUTPUT);
  pinMode(D4, OUTPUT);
  lcd_init();
}



void loop() {
  char data[16];
  while(true){
    for(int j = 0; j < 5; j++){
      delay(1000);
      cmd(0x80);
      sprintf(data,"Jack %d",j);
      str(data);
    }
  }  
}