LCDcontrol

// C++ code
//
void send_8bits_command(int RS1,int D01,int D11,int D21,int D31,int D41,int D51,int D61,int D71);
void send_4bits_command(int RS1,int D01,int D11,int D21,int D31,int D41,int D51,int D61,int D71);

#define D0 9
#define D1 8
#define D2 7
#define D3 6
#define D4 5
#define D5 4
#define D6 3
#define D7 2
#define RS 13
#define E  12

//#define 4bit_mode send_8bits_command(0,0,0,0,0,0,1,0,0)
//#define clear_display send_4bits_command(0,0,0,0,0,0,0,0,1);
//#define return_home send_4bits_command(0,0,0,0,0,0,0,1,0);
//#define display_on send_4bits_command(0,0,0,1,0,1,0,0,0);

void setup()
{
  pinMode(D0 , OUTPUT);
  pinMode(D1 , OUTPUT);
  pinMode(D2 , OUTPUT);
  pinMode(D3 , OUTPUT);
  pinMode(D4 , OUTPUT);
  pinMode(D5 , OUTPUT);
  pinMode(D6 , OUTPUT);
  pinMode(D7 , OUTPUT);
  pinMode(RS , OUTPUT);
  pinMode(E  , OUTPUT);

  send_8bits_command(0,0,0,0,0,0,1,0,0);
  send_4bits_command(0,0,0,0,0,0,0,0,1);
  send_4bits_command(0,0,0,0,0,0,0,1,0);
  send_4bits_command(0,0,0,0,0,1,1,0,0);

}

void loop()
{
  send_4bits_command(1,0,1,0,0,0,0,0,1);
  //send_4bits_command(0,1,0,0,0,1,1,0,0);
  delay(1000);
  send_4bits_command(1,0,1,0,0,0,0,1,0);
  //send_4bits_command(0,1,0,0,0,1,1,0,0);
  delay(1000);
  send_4bits_command(1,0,1,0,0,0,0,1,1);
  //send_4bits_command(0,1,0,0,0,1,1,0,0);
  delay(1000);

  //send_4bits_command(0,0,0,0,0,0,0,0,1);
  //send_4bits_command(0,0,0,0,0,0,0,1,0);

  send_4bits_command(0,1,0,0,0,0,0,0,0);

}

void send_8bits_command(int RS1,int D01,int D11,int D21,int D31,int D41,int D51,int D61,int D71)
{
  digitalWrite(RS,RS1);
  digitalWrite(D0,D01);
  digitalWrite(D1,D11);
  digitalWrite(D2,D21);
  digitalWrite(D3,D31);
  digitalWrite(D4,D41);
  digitalWrite(D5,D51);
  digitalWrite(D6,D61);
  digitalWrite(D7,D71);

  digitalWrite(E,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(E,LOW);
  delay(1);
}

void send_4bits_command(int RS1,int D01,int D11,int D21,int D31,int D41,int D51,int D61,int D71){
  digitalWrite(RS,RS1);

  digitalWrite(D7,D01);
  digitalWrite(D6,D11);
  digitalWrite(D5,D21);
  digitalWrite(D4,D31);

  digitalWrite(E,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(E,LOW);
  delay(1);

  digitalWrite(RS,RS1);

  digitalWrite(D7,D41);
  digitalWrite(D6,D51);
  digitalWrite(D5,D61);
  digitalWrite(D4,D71);

  digitalWrite(E,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(E,LOW);
  delay(1);
}