--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/service/busyboxArduino/LiquidCrystal_V1.2.1/LiquidCrystal/LiquidCrystal_I2C.cpp	Sat Jan 03 23:35:16 2015 -0800
@@ -0,0 +1,291 @@
+// ---------------------------------------------------------------------------
+// Created by Francisco Malpartida on 20/08/11.
+// Copyright 2011 - Under creative commons license 3.0:
+//        Attribution-ShareAlike CC BY-SA
+//
+// This software is furnished "as is", without technical support, and with no 
+// warranty, express or implied, as to its usefulness for any purpose.
+//
+// Thread Safe: No
+// Extendable: Yes
+//
+// @file LiquidCrystal_I2C.c
+// This file implements a basic liquid crystal library that comes as standard
+// in the Arduino SDK but using an I2C IO extension board.
+// 
+// @brief 
+// This is a basic implementation of the LiquidCrystal library of the
+// Arduino SDK. The original library has been reworked in such a way that 
+// this class implements the all methods to command an LCD based
+// on the Hitachi HD44780 and compatible chipsets using I2C extension
+// backpacks such as the I2CLCDextraIO with the PCF8574* I2C IO Expander ASIC.
+//
+// The functionality provided by this class and its base class is identical
+// to the original functionality of the Arduino LiquidCrystal library.
+//
+//
+//
+// @author F. Malpartida - fmalpartida@gmail.com
+// ---------------------------------------------------------------------------
+#if (ARDUINO <  100)
+#include <WProgram.h>
+#else
+#include <Arduino.h>
+#endif
+#include <inttypes.h>
+#include "I2CIO.h"
+#include "LiquidCrystal_I2C.h"
+
+// CONSTANT  definitions
+// ---------------------------------------------------------------------------
+
+// flags for backlight control
+/*!
+ @defined 
+ @abstract   LCD_NOBACKLIGHT
+ @discussion NO BACKLIGHT MASK
+ */
+#define LCD_NOBACKLIGHT 0x00
+
+/*!
+ @defined 
+ @abstract   LCD_BACKLIGHT
+ @discussion BACKLIGHT MASK used when backlight is on
+ */
+#define LCD_BACKLIGHT   0xFF
+
+
+// Default library configuration parameters used by class constructor with
+// only the I2C address field.
+// ---------------------------------------------------------------------------
+/*!
+ @defined 
+ @abstract   Enable bit of the LCD
+ @discussion Defines the IO of the expander connected to the LCD Enable
+ */
+#define EN 6  // Enable bit
+
+/*!
+ @defined 
+ @abstract   Read/Write bit of the LCD
+ @discussion Defines the IO of the expander connected to the LCD Rw pin
+ */
+#define RW 5  // Read/Write bit
+
+/*!
+ @defined 
+ @abstract   Register bit of the LCD
+ @discussion Defines the IO of the expander connected to the LCD Register select pin
+ */
+#define RS 4  // Register select bit
+
+/*!
+ @defined 
+ @abstract   LCD dataline allocation this library only supports 4 bit LCD control
+ mode.
+ @discussion D4, D5, D6, D7 LCD data lines pin mapping of the extender module
+ */
+#define D4 0
+#define D5 1
+#define D6 2
+#define D7 3
+
+
+// CONSTRUCTORS
+// ---------------------------------------------------------------------------
+LiquidCrystal_I2C::LiquidCrystal_I2C( uint8_t lcd_Addr )
+{
+   config(lcd_Addr, EN, RW, RS, D4, D5, D6, D7);
+}
+
+
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t backlighPin, 
+                                     t_backlighPol pol = POSITIVE)
+{
+   config(lcd_Addr, EN, RW, RS, D4, D5, D6, D7);
+   setBacklightPin(backlighPin, pol);
+}
+
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
+                                     uint8_t Rs)
+{
+   config(lcd_Addr, En, Rw, Rs, D4, D5, D6, D7);
+}
+
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
+                                     uint8_t Rs, uint8_t backlighPin, 
+                                     t_backlighPol pol = POSITIVE)
+{
+   config(lcd_Addr, En, Rw, Rs, D4, D5, D6, D7);
+   setBacklightPin(backlighPin, pol);
+}
+
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
+                                     uint8_t Rs, uint8_t d4, uint8_t d5,
+                                     uint8_t d6, uint8_t d7 )
+{
+   config(lcd_Addr, En, Rw, Rs, d4, d5, d6, d7);
+}
+
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
+                                     uint8_t Rs, uint8_t d4, uint8_t d5,
+                                     uint8_t d6, uint8_t d7, uint8_t backlighPin, 
+                                     t_backlighPol pol = POSITIVE )
+{
+   config(lcd_Addr, En, Rw, Rs, d4, d5, d6, d7);
+   setBacklightPin(backlighPin, pol);
+}
+
+// PUBLIC METHODS
+// ---------------------------------------------------------------------------
+
+//
+// begin
+void LiquidCrystal_I2C::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) 
+{
+   
+   init();     // Initialise the I2C expander interface
+   LCD::begin ( cols, lines, dotsize );   
+}
+
+
+// User commands - users can expand this section
+//----------------------------------------------------------------------------
+// Turn the (optional) backlight off/on
+
+//
+// setBacklightPin
+void LiquidCrystal_I2C::setBacklightPin ( uint8_t value, t_backlighPol pol = POSITIVE )
+{
+   _backlightPinMask = ( 1 << value );
+   _polarity = pol;
+   setBacklight(BACKLIGHT_OFF);
+}
+
+//
+// setBacklight
+void LiquidCrystal_I2C::setBacklight( uint8_t value ) 
+{
+   // Check if backlight is available
+   // ----------------------------------------------------
+   if ( _backlightPinMask != 0x0 )
+   {
+      // Check for polarity to configure mask accordingly
+      // ----------------------------------------------------------
+      if  (((_polarity == POSITIVE) && (value > 0)) || 
+           ((_polarity == NEGATIVE ) && ( value == 0 )))
+      {
+         _backlightStsMask = _backlightPinMask & LCD_BACKLIGHT;
+      }
+      else 
+      {
+         _backlightStsMask = _backlightPinMask & LCD_NOBACKLIGHT;
+      }
+      _i2cio.write( _backlightStsMask );
+   }
+}
+
+
+// PRIVATE METHODS
+// ---------------------------------------------------------------------------
+
+//
+// init
+int LiquidCrystal_I2C::init()
+{
+   int status = 0;
+   
+   // initialize the backpack IO expander
+   // and display functions.
+   // ------------------------------------------------------------------------
+   if ( _i2cio.begin ( _Addr ) == 1 )
+   {
+      _i2cio.portMode ( OUTPUT );  // Set the entire IO extender to OUTPUT
+      _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+      status = 1;
+      _i2cio.write(0);  // Set the entire port to LOW
+   }
+   return ( status );
+}
+
+//
+// config
+void LiquidCrystal_I2C::config (uint8_t lcd_Addr, uint8_t En, uint8_t Rw, uint8_t Rs, 
+                                uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7 )
+{
+   _Addr = lcd_Addr;
+   
+   _backlightPinMask = 0;
+   _backlightStsMask = LCD_NOBACKLIGHT;
+   _polarity = POSITIVE;
+   
+   _En = ( 1 << En );
+   _Rw = ( 1 << Rw );
+   _Rs = ( 1 << Rs );
+   
+   // Initialise pin mapping
+   _data_pins[0] = ( 1 << d4 );
+   _data_pins[1] = ( 1 << d5 );
+   _data_pins[2] = ( 1 << d6 );
+   _data_pins[3] = ( 1 << d7 );   
+}
+
+
+
+// low level data pushing commands
+//----------------------------------------------------------------------------
+
+//
+// send - write either command or data
+void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) 
+{
+   // No need to use the delay routines since the time taken to write takes
+   // longer that what is needed both for toggling and enable pin an to execute
+   // the command.
+   
+   if ( mode == FOUR_BITS )
+   {
+      write4bits( (value & 0x0F), COMMAND );
+   }
+   else 
+   {
+      write4bits( (value >> 4), mode );
+      write4bits( (value & 0x0F), mode);
+   }
+}
+
+//
+// write4bits
+void LiquidCrystal_I2C::write4bits ( uint8_t value, uint8_t mode ) 
+{
+   uint8_t pinMapValue = 0;
+   
+   // Map the value to LCD pin mapping
+   // --------------------------------
+   for ( uint8_t i = 0; i < 4; i++ )
+   {
+      if ( ( value & 0x1 ) == 1 )
+      {
+         pinMapValue |= _data_pins[i];
+      }
+      value = ( value >> 1 );
+   }
+   
+   // Is it a command or data
+   // -----------------------
+   if ( mode == DATA )
+   {
+      mode = _Rs;
+   }
+   
+   pinMapValue |= mode | _backlightStsMask;
+   pulseEnable ( pinMapValue );
+}
+
+//
+// pulseEnable
+void LiquidCrystal_I2C::pulseEnable (uint8_t data)
+{
+   _i2cio.write (data | _En);   // En HIGH
+   _i2cio.write (data & ~_En);  // En LOW
+}
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