Test code for LCD screen.

LCD-Test.ino

int lD = 250;
int lnD = 500;
 
int N = 0x8;
int F = 0x4;
 
int RS = 0;
int RW = 1;
int E = 2;
int DB4 = 4;
int DB5 = 5;
int DB6 = 6;
int DB7 = 7;
 
void fireCommand(){
  digitalWrite(E, LOW);
  delayMicroseconds(2);
  digitalWrite(E, HIGH);
  delayMicroseconds(2);
  digitalWrite(E, LOW);
  delayMicroseconds(500);
}
 
void write4(char data, boolean isChar){
  PORTD = data & 0xF0 | (isChar?0x1:0);
  fireCommand();
}
 
void write8(char data, boolean isChar){
  write4(data, isChar);
  char data1 = (data & 0xF) << 4;
  write4(data1, isChar);
}
 
void setup(){
  delay(45);
  pinMode(E, OUTPUT);
  pinMode(RS, OUTPUT);
  pinMode(RW, OUTPUT);
  pinMode(DB4, OUTPUT);
  pinMode(DB5, OUTPUT);
  pinMode(DB6, OUTPUT);
  pinMode(DB7, OUTPUT);
  
  digitalWrite(E, LOW);
  digitalWrite(RS, LOW);
  digitalWrite(RW, LOW);
  
  // Function set to 8bit
  write4(0x30, false);  
  
  // Function set to 4bit
  write8(0x20 | N | F, false);
  
  // Repeat function set
  write8(0x20 | N | F, false);
  
  //Display on/off control
  write8(0x0C, false);
    
  // Entry mode set
  write8(0x06, false); // 0x06
  
}
 
void loop(){
    /// Text output
    // Display clear
  write8(0x01, false);  
  
  // Set DDRAM addr to 00
  write8(0x80, false);
  
  // Output 
  write8(0xA8, true);  // "П"
  delay(lD);  
  write8(0x70, true);  // "p"
    delay(lD);
  write8(0x65, true);  // "e"
    delay(lD);
  write8(0xB3, true);  // "в"
    delay(lD);
  write8(0x65, true);  // "e"  
    delay(lD);
  write8(0x67, true);  // "g"
    delay(lD);
  write8(0x2C, true);  // ","
    delay(lD);
  write8(0x20, true);  // " "
    delay(lD);
  
  // Set DDRAM addr to 40
  write8(0xC0, false);
  delay(lD);
  write8(0x4D, true);  // "M"
    delay(lD);
  write8(0x65, true);  // "e"
    delay(lD);
  write8(0x67, true);  // "g"  
    delay(lD);
  write8(0xB3, true);  // "в"
    delay(lD);
  write8(0x65, true);  // "e"  
    delay(lD);
  write8(0x67, true);  // "g"
    delay(lD);
  write8(0x21, true);  // "!"  
 
  delay(lnD);
}