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-/*
-LCD4Bit v0.1 16/Oct/2006 neillzero http://abstractplain.net
-
-What is this?
-An arduino library for comms with HD44780-compatible LCD, in 4-bit mode (saves pins)
-
-Sources:
-- The original "LiquidCrystal" 8-bit library and tutorial
-    http://www.arduino.cc/en/uploads/Tutorial/LiquidCrystal.zip
-    http://www.arduino.cc/en/Tutorial/LCDLibrary
-- DEM 16216 datasheet http://www.maplin.co.uk/Media/PDFs/N27AZ.pdf
-- Massimo's suggested 4-bit code (I took initialization from here) http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1144924220/8
-See also:
-- glasspusher's code (probably more correct): http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1160586800/0#0
-
-Tested only with a DEM 16216 (maplin "N27AZ" - http://www.maplin.co.uk/Search.aspx?criteria=N27AZ)
-If you use this successfully, consider feeding back to the arduino wiki with a note of which LCD it worked on.
-
-Usage:
-see the examples folder of this library distribution.
-
-*/
-
-#if defined(ARDUINO) && ARDUINO >= 100
-#include "Arduino.h"
-#else
-#include "WProgram.h"
-#endif
-
-#include "LCD4Bit_mod.h"
-
-//command bytes for LCD
-#define CMD_CLR 0x01
-#define CMD_RIGHT 0x1C
-#define CMD_LEFT 0x18
-#define CMD_HOME 0x02
-
-//pulse the Enable pin high (for a microsecond).
-//This clocks whatever command or data is in DB4~7 into the LCD controller.
-void LCD4Bit_mod::pulseEnablePin(){
-  digitalWrite(Enable,LOW);
-  delayMicroseconds(1);
-  // send a pulse to enable
-  digitalWrite(Enable,HIGH);
-  delayMicroseconds(1);
-  digitalWrite(Enable,LOW);
-  delay(1);  // pause 1 ms.  TODO: what delay, if any, is necessary here?
-}
-
-//push a nibble of data through the the LCD's DB4~7 pins, clocking with the Enable pin.
-//We don't care what RS and RW are, here.
-void LCD4Bit_mod::pushNibble(byte value)
-{
-  byte val_nibble= value & 0x0F;  //clean the value.  (unnecessary)
-
-  for (byte i=DB[0]; i <= DB[3]; i++) {
-    digitalWrite(i,val_nibble & 01);
-    val_nibble >>= 1;
-  }
-  pulseEnablePin();
-}
-
-//push a byte of data through the LCD's DB4~7 pins, in two steps, clocking each with the enable pin.
-void LCD4Bit_mod::pushByte(byte value)
-{
-  byte val_lower = value & 0x0F;
-  byte val_upper = value >> 4;
-  pushNibble(val_upper);
-  pushNibble(val_lower);
-}
-
-void LCD4Bit_mod::commandWriteNibble(byte nibble)
-{
-  digitalWrite(RS, LOW);
-  if (USING_RW) { digitalWrite(RW, LOW); }
-  pushNibble(nibble);
-}
-
-
-void LCD4Bit_mod::commandWrite(byte value)
-{
-  digitalWrite(RS, LOW);
-  if (USING_RW) { digitalWrite(RW, LOW); }
-  pushByte(value);
-  //TODO: perhaps better to add a delay after EVERY command, here.  many need a delay, apparently.
-}
-
-
-
-
-//print the given character at the current cursor position. overwrites, doesn't insert.
-void LCD4Bit_mod::write(byte c)
-{
-  //set the RS and RW pins to show we're writing data
-  digitalWrite(RS, HIGH);
-  if (USING_RW) { digitalWrite(RW, LOW); }
-
-  //let pushByte worry about the intricacies of Enable, nibble order.
-  pushByte(c);
-}
-
-
-//print the given string to the LCD at the current cursor position.  overwrites, doesn't insert.
-//While I don't understand why this was named printIn (PRINT IN?) in the original LiquidCrystal library, I've preserved it here to maintain the interchangeability of the two libraries.
-void LCD4Bit_mod::print(const char* msg)
-{
-  byte i;  //fancy int.  avoids compiler warning when comparing i with strlen()'s uint8_t
-  byte l = strlen(msg);
-  for (i=0; i < l; i++){
-    if (msg[i] >= 20) write(msg[i]);
-  }
-}
-
-
-//send the clear screen command to the LCD
-void LCD4Bit_mod::clear()
-{
-  commandWrite(CMD_CLR);
-  delay(1);
-}
-
-
-// initiatize lcd after a short pause
-//while there are hard-coded details here of lines, cursor and blink settings, you can override these original settings after calling .init()
-void LCD4Bit_mod::begin ()
-{
-  pinMode(Enable,OUTPUT);
-  pinMode(RS,OUTPUT);
-  if (USING_RW) { pinMode(RW,OUTPUT); }
-  pinMode(DB[0],OUTPUT);
-  pinMode(DB[1],OUTPUT);
-  pinMode(DB[2],OUTPUT);
-  pinMode(DB[3],OUTPUT);
-
-  delay(50);
-
-  //The first 4 nibbles and timings are not in my DEM16217 SYH datasheet, but apparently are HD44780 standard...
-  commandWriteNibble(0x03);
-  delay(5);
-  commandWriteNibble(0x03);
-  delayMicroseconds(100);
-  commandWriteNibble(0x03);
-  delay(5);
-
-  // needed by the LCDs controller
-  //this being 2 sets up 4-bit mode.
-  commandWriteNibble(0x02);
-  commandWriteNibble(0x02);
-  //todo: make configurable by the user of this library.
-  //NFXX where
-  //N = num lines (0=1 line or 1=2 lines).
-  //F= format (number of dots (0=5x7 or 1=5x10)).
-  //X=don't care
-
-  byte num_lines_ptn = (num_lines - 1) << 3;
-  byte dot_format_ptn = 0x00;      //5x7 dots.  0x04 is 5x10
-
-  commandWriteNibble(num_lines_ptn | dot_format_ptn);
-  delayMicroseconds(60);
-
-  //The rest of the init is not specific to 4-bit mode.
-  //NOTE: we're writing full bytes now, not nibbles.
-
-  // display control:
-  // turn display on, cursor off, no blinking
-  commandWrite(0x0C);
-  delayMicroseconds(60);
-
-  //clear display
-  commandWrite(0x01);
-  delay(3);
-
-  // entry mode set: 06
-  // increment automatically, display shift, entire shift off
-  commandWrite(0x06);
-
-  delay(1);//TODO: remove unnecessary delays
-}
-
-
-//non-core stuff --------------------------------------
-//move the cursor to the given absolute position.  line numbers start at 1.
-//if this is not a 2-line LCD4Bit_mod instance, will always position on first line.
-void LCD4Bit_mod::setCursor(byte x, byte line)
-{
-  //first, put cursor home
-  commandWrite(CMD_HOME);
-  //offset 40 chars in if second line requested
-  x += line * 40;
-
-  //advance the cursor to the right according to position. (second line starts at position 40).
-  for (byte i=0; i<x; i++) {
-    commandWrite(0x14);
-  }
-}
-
-//scroll whole display to left
-void LCD4Bit_mod::leftScroll(byte num_chars, unsigned int delay_time)
-{
-  for (byte i=0; i<num_chars; i++) {
-    commandWrite(CMD_LEFT);
-    delay(delay_time);
-  }
-}
-
-//Improvements ------------------------------------------------
-//Remove the unnecessary delays (e.g. from the end of pulseEnablePin()).
-//Allow the user to pass the pins to be used by the LCD in the constructor, and store them as member variables of the class instance.
-//-------------------------------------------------------------