Add new example showing RTC with LCD display.

libraries/LiquidCrystal/LiquidCrystal_I2C_ByVac.cpp

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+// ---------------------------------------------------------------------------
+// Created by GHPS on 5/06/2012.
+// Copyright 2012 - 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_ByVac.c
+// This file implements a basic liquid crystal library that comes as standard
+// in the Arduino SDK but using the extension board BV4218/BV4208 from ByVac.
+// 
+// @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
+// backpack BV4218 from ByVac.
+//
+// The functionality provided by this class and its base class is identical
+// to the original functionality of the Arduino LiquidCrystal library.
+//
+// @author GHPS - ghps@users.sourceforge.net
+// ---------------------------------------------------------------------------
+#if (ARDUINO <  100)
+#include <WProgram.h>
+#else
+#include <Arduino.h>
+#endif
+#include <inttypes.h>
+#include "LiquidCrystal_I2C_ByVac.h"
+
+// CONSTRUCTORS
+// ---------------------------------------------------------------------------
+LiquidCrystal_I2C_ByVac::LiquidCrystal_I2C_ByVac( uint8_t lcd_Addr )
+{
+   _Addr = lcd_Addr;
+   _polarity == NEGATIVE;
+}
+
+// PUBLIC METHODS
+// ---------------------------------------------------------------------------
+
+//
+// begin
+void LiquidCrystal_I2C_ByVac::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) 
+{
+   Wire.begin();
+   LCD::begin ( cols, lines, dotsize );   
+}
+
+// User commands - users can expand this section
+//----------------------------------------------------------------------------
+// Turn the integrated backlight off/on
+
+// setBacklight
+void LiquidCrystal_I2C_ByVac::setBacklight( uint8_t value ) 
+{
+  Wire.beginTransmission(_Addr);
+  Wire.write(0x03); 					//  ByVac command code 0x03 for backlight
+  if (value==0) Wire.write(1); else Wire.write((byte)0); 	// 1 for off since polarity is NEGATIVE
+  Wire.endTransmission();
+}
+
+// Turn the contrast off/on
+
+// setContrast
+void LiquidCrystal_I2C_ByVac::setContrast( uint8_t value ) 
+{
+  Wire.beginTransmission(_Addr);
+  Wire.write(0x05); 					//  ByVac command code 0x05 for contrast
+  if (value==0) Wire.write((byte)0); else Wire.write(1); 
+  Wire.endTransmission();
+}
+
+// PRIVATE METHODS
+// ---------------------------------------------------------------------------
+
+//
+// init
+int LiquidCrystal_I2C_ByVac::init()
+{
+   int status = 0;
+   
+   // ByVac backpack initialized by onboard firmware
+   // ------------------------------------------------------------------------
+   status=1;
+   return ( status );
+}
+
+// low level data pushing commands
+//----------------------------------------------------------------------------
+
+//
+// send - write either command or data
+void LiquidCrystal_I2C_ByVac::send(uint8_t value, uint8_t mode) 
+{
+  Wire.beginTransmission(_Addr);
+  Wire.write(mode+1); // map COMMAND (0) -> ByVac command code 0x01/ DATA  (1) ->  ByVac command code 0x02
+  Wire.write(value);
+  Wire.endTransmission();
+}