Display 16x2

/*
 */

#include <avr/io.h>
#include <util/delay.h>

#define F_CPU 16000000

/*
 *  Este codigo eh para ser usado com display LCD 16x2
 *  no modo 8-bit
 *
 */


//**************Definicoes para pinos de Controle***********
#define RS      (1 << PB0)
#define E       (1 << PB1)

//********************Definicoes do Display*****************
#define Linha   2
#define Coluna  16


int main(void)
{
    DDRD  = 0xFF;
    DDRB |= RS | E;

    iniciaDisplay();

    while(1){
    }


    return 0;
}


/*
 * Esta inicializacao e recomEdada pelo datasheet do display
 * para casos onde a fonte de Eergia nao e satisfatoria
 */

void iniciaDisplay(void){

    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTB &= ~E;  // Desabilitar o sinal de Enable
    _delay_ms(20);
    PORTD |= 0x30;
    _delay_ms(5);
    PORTD |= 0x30;
    _delay_ms(1);
    PORTD |= 0x30;
    _delay_ms(10);

    functionSet();
    clearDisplay();
    entryMode();
    displayOn();
}

//Function Set para 8-Bits, duas linhas e 5x10 dots
void functionSet(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   1   1   1   1   *   *
     */
    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x38;
    PORTB |=  E;  // Desabilitar o sinal de Enable
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);
}

// Limpa o Display
void clearDisplay(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   0   0   0   0   0   1
     */
    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x01;
    PORTB |=  E;
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);
}

// Voltar o cursor a posicao 0 (Edereco 0)
void cursorAtHome(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   0   0   0   0   1   *
     *  Testar DB0 com 0 ou 1
     */

    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x02;
    PORTB |=  E;
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);

}

void displayOn(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   0   0   1   1   1   1
     *  Display On com cursor piscando
     */
    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x0F;
    PORTB |=  E;
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);
}

void displayOff(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   0   0   1   0   0   0
     *  Display On com cursor piscando
     */
    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x08;
    PORTB |=  E;
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);

}

void entryMode(void){
    /*
     *  RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
     *  0   0   0   0   0   0   0   1   1   0
     *  Display On com cursor piscando
     */
    PORTB &= ~RS; // Desabilitar o sinal de Register Select
    PORTD |= 0x06;
    PORTB |=  E;
    _delay_ms(1);
    PORTB &= ~E;
    _delay_ms(1);
}