Arduino HD44780 code button control - C Code Bank

                /*
*Title: hd44870 lcd button control
*Date: 27-11-2009
*Author: Wolfmankurd
*Circuit:
*4bit mode, 11-14 to d2-d5 11,12 to enable r/w
*check arduino lcdcrystal exmaples for circuit diagrams.
*d8,9,10 buttons (make sure to have pull down resisitors.
**/

#include <LiquidCrystal.h>

const int debounce = 500; //change to taste.
const int rows = 4;
const int cols = 20;
int x,y,letter;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()
{
  lcd.begin(rows, cols);
  lcd.cursor();
  letter=' ';
}
void loop()
{
  if(button(8)){
    cursorMove(); 
    letter=' ';
  }
  if(button(9)){
    switch (letter){
      case ' ':
        letter='A';
        break;
      case 'Z':
        letter='a';
        break;
      case 'z':
        letter=' ';
        break;
      default:
        letter++;
    }
    lcdPrint();
  }
  if(button(10)){
    switch (letter){
      case ' ':
        letter='z';
        break;
      case 'a':
        letter='Z';
        break;
      case 'A':
        letter=' ';
        break;
      default:
        letter--;
    }
    lcdPrint();
  }
  delay(debounce);
}

void lcdPrint()
{
  lcd.print(letter,BYTE);
  lcd.setCursor(x,y); 
  return;
}

void cursorMove()
{
   if(x==cols){
    x=0;
    y++; 
  }
  if(y==rows){
    y=0;
    x=0;
  }
  lcd.setCursor(++x,y);
  return;
}

boolean button(int pin)
{
 if(digitalRead(pin)==HIGH){
  return true;
 }
return false; 
}