apuntes_Arduino/lcd/metodo_8bits/metodo_8bits.ino

int DI = 12;
int RW = 11;
int DB[] = {3, 4, 5, 6, 7, 8, 9, 10};// use array to select pin for bus
int Enable = 2;

void LcdCommandWrite(int value) {
    int i = 0;
    // assign value for bus
    for (i=DB[0]; i <= DI; i++) {
        // for 1602 LCD, it uses D7-D0( not D0-D7) for signal identification;
        // here, it’s used for signal inversion. 
        digitalWrite(i,value & 01);
        value >>= 1;
    }
    digitalWrite(Enable,LOW);
    delayMicroseconds(1);
    digitalWrite(Enable,HIGH);
    delayMicroseconds(1);  // wait for 1ms
    digitalWrite(Enable,LOW);
    delayMicroseconds(1);  // wait for 1ms
}

void LcdDataWrite(int value) {
    // initialize all pins
    int i = 0;
    digitalWrite(DI, HIGH);
    digitalWrite(RW, LOW);
    for (i=DB[0]; i <= DB[7]; i++) {
        digitalWrite(i,value & 01);
        value >>= 1;
    }
    digitalWrite(Enable,LOW);
    delayMicroseconds(1);
    digitalWrite(Enable,HIGH);
    delayMicroseconds(1);
    digitalWrite(Enable,LOW);
    delayMicroseconds(1);  // wait for 1ms
}

void setup (void) {
    int i = 0;
    for (i=Enable; i <= DI; i++) {
        pinMode(i,OUTPUT);
    }
    delay(100);
    // initialize LCD after a brief pause
    // for LCD control
    LcdCommandWrite(0x38);  // select as 8-bit interface, 2-line display, 5x7 character size 
    delay(64);                      
    LcdCommandWrite(0x38);  // select as 8-bit interface, 2-line display, 5x7 character size 
    delay(50);                      
    LcdCommandWrite(0x38);  // select as 8-bit interface, 2-line display, 5x7 character size             
    delay(20);                      
    LcdCommandWrite(0x06);  // set input mode
                             // auto-increment, no display of shifting
    delay(20);                      
    LcdCommandWrite(0x0E);  // display setup
                             // turn on the monitor, cursor on, no flickering
    delay(20);                      
    LcdCommandWrite(0x01);  // clear the scree, cursor position returns to 0
    delay(100);                      
    LcdCommandWrite(0x80);  //  display setup
                             //  turn on the monitor, cursor on, no flickering

    delay(20);                      
}

void loop (void) {
    LcdCommandWrite(0x01);  // clear the scree, cursor position returns to 0  
    delay(10); 
    LcdCommandWrite(0x80+3); 
    delay(10);                     
    // write in welcome message 
    LcdDataWrite('F');
    delay(50);
    LcdDataWrite('u');
    delay(50);
    LcdDataWrite('z');
    delay(50);
    LcdDataWrite('a');
    delay(50);
    LcdDataWrite('n');
    delay(50);
    LcdDataWrite(' ');
    delay(50);
    LcdDataWrite('T');
    delay(50);
    LcdDataWrite('o');
    delay(50);
    LcdDataWrite('k');
    delay(50);
    LcdDataWrite('o');
    delay(50);
    LcdCommandWrite(0xc0+0);  // set cursor position at second line, second position
    delay(10); 
    LcdDataWrite('*');
    LcdDataWrite('*');delay(70);
    LcdDataWrite('A');delay(90);
    LcdDataWrite('R');delay(110);
    LcdDataWrite('D');delay(130);
    LcdDataWrite('U');delay(150);
    LcdDataWrite('I');delay(170);
    LcdDataWrite('N');delay(200);
    LcdDataWrite('O');delay(170);
    LcdDataWrite('-');delay(150);
    LcdDataWrite('L');delay(130);
    LcdDataWrite('E');delay(110);
    LcdDataWrite('A');delay(90);
    LcdDataWrite('R');delay(70);
    LcdDataWrite('N');delay(70);
    LcdDataWrite('*');
    LcdDataWrite('*');
    delay(3000);
    LcdCommandWrite(0x01);  // clear the screen, cursor returns to 0  
    delay(10);
    LcdDataWrite('A');
    LcdDataWrite('p');
    LcdDataWrite('r');
    LcdDataWrite('e');
    LcdDataWrite('n');
    LcdDataWrite('d');
    LcdDataWrite('e');
    LcdDataWrite(' ');
    LcdDataWrite(' ');
    LcdDataWrite('c');
    LcdDataWrite('r');
    LcdDataWrite('e');
    LcdDataWrite('a');
    LcdDataWrite(' ');
    LcdDataWrite(' ');
    LcdCommandWrite(0xc0);
    delay(2000);
    // set mode as new characters replay old ones,
    // where there is no new ones remain the same
    LcdCommandWrite(0xc02); 
    delay(10);
    // set cursor position at first line, sixth position
    LcdCommandWrite(0xc80+6);
    delay(10);  
    LcdDataWrite('o');
    LcdDataWrite('p');
    LcdDataWrite('e');
    LcdDataWrite('n');
    LcdDataWrite(' ');
    LcdDataWrite('s');
    delay(3000);
}