//lcd_write_str(2, 3, "SENAI");
void lcd_write_str(char linha, char coluna, char * texto) {
   switch(linha){ 
      case 1: lcd_write_byte(0x80-1+coluna, 0); break;
      case 2: lcd_write_byte(0xC0-1+coluna, 0); break;
   }
   for(int i = 0; texto[i] != '\0'; i++) { //caractere NULL ('\0')
      lcd_write_byte(texto[i], 1); //Escreve cada byte contido em texto[], rs=1 
   }
}
void lcd_write_byte(unsigned char chr, unsigned char rs) { //
    digitalWrite(9, rs); //rs = 0 -> comando (clear lcd); rs = 1 -> dado ('A');
    digitalWrite(4, (((chr>>4)&0B00000001)==0B00000001)); //TRUE or FALSE
    digitalWrite(5, (((chr>>4)&0B00000010)==0B00000010));
    digitalWrite(6, (((chr>>4)&0B00000100)==0B00000100));
    digitalWrite(7, (((chr>>4)&0B00001000)==0B00001000));
    enable(); 
    digitalWrite(4, (((chr)&0B00000001)==0B00000001)); //TRUE or FALSE
    digitalWrite(5, (((chr)&0B00000010)==0B00000010));
    digitalWrite(6, (((chr)&0B00000100)==0B00000100));
    digitalWrite(7, (((chr)&0B00001000)==0B00001000));    
    enable();
}

void enable(void){
  digitalWrite(8, HIGH); 
  delayMicroseconds(10); //mínimo > 1.2us
  digitalWrite(8, LOW); 
  delayMicroseconds(10); //mínimo > 1.2us
}
void lcd_config(void) {
   char pino[] = {4, 5, 6, 7, 8, 9}; 
   for(int i = 0; i < sizeof(pino); i++) {
     pinMode(pino[i], OUTPUT);   //Configura cada pino da matriz como saída;
     digitalWrite(pino[i], LOW); //Garante que cada pino inicie com zero;
   }
   delay(100); //mínimo > 40 ms
   digitalWrite(5, HIGH); 
   digitalWrite(4, HIGH); 
   enable(); //clock
   delayMicroseconds(100); //mínimo > 39us
   digitalWrite(4, LOW);
   enable(); 
   delayMicroseconds(100); //mínimo > 39us   
   digitalWrite(5, LOW);  
   enable(); 
   digitalWrite(7, HIGH);
   digitalWrite(6, HIGH);
   enable();
   delayMicroseconds(100); //mínimo > 37us 
   digitalWrite(7, LOW);
   digitalWrite(6, LOW);     
   enable();
   digitalWrite(4, HIGH);
   enable();
   delay(2); //mínimo > 1.53ms
}

void setup() {
  lcd_config(); 
  lcd_write_byte('A', 1); //Escreve 'A' no LCD, RS=1
  lcd_write_str(2, 3, "SENAI");
}

void loop() {
  // put your main code here, to run repeatedly:

}