//DFRobot.com
#include?“LiquidCrystal_I2C.h“
#include?
#include?“WProgram.h“?
#include?“Wire.h“



//?When?the?display?powers?up?it?is?configured?as?follows:
//
//?1.?Display?clear
//?2.?Function?set:?
//????DL?=?1;?8-bit?interface?data?
//????N?=?0;?1-line?display?
//????F?=?0;?5x8?dot?character?font?
//?3.?Display?on/off?control:?
//????D?=?0;?Display?off?
//????C?=?0;?Cursor?off?
//????B?=?0;?blinking?off?
//?4.?Entry?mode?set:?
//????I/D?=?1;?Increment?by?1
//????S?=?0;?No?shift?
//
//?Note?however?that?resetting?the?Arduino?doesn‘t?reset?the?LCD?so?we
//?can‘t?assume?that?its?in?that?state?when?a?sketch?starts?（and?the
//?LiquidCrystal?constructor?is?called）.

LiquidCrystal_I2C::LiquidCrystal_I2C（uint8_t?lcd_Addruint8_t?lcd_colsuint8_t?lcd_rows）
{
??_Addr?=?lcd_Addr;
??_cols?=?lcd_cols;
??_rows?=?lcd_rows;
??_backlightval?=?LCD_NOBACKLIGHT;
}

void?LiquidCrystal_I2C::init（）{
	init_priv（）;
}

void?LiquidCrystal_I2C::init_priv（）
{
	Wire.begin（）;
	_displayfunction?=?LCD_4BITMODE?|?LCD_1LINE?|?LCD_5x8DOTS;
	begin（_cols?_rows）;??
}

void?LiquidCrystal_I2C::begin（uint8_t?cols?uint8_t?lines?uint8_t?dotsize）?{
	if?（lines?>?1）?{
		_displayfunction?|=?LCD_2LINE;
	}
	_numlines?=?lines;

	//?for?some?1?line?displays?you?can?select?a?10?pixel?high?font
	if?（（dotsize?!=?0）?&&?（lines?==?1））?{
		_displayfunction?|=?LCD_5x10DOTS;
	}

	//?SEE?PAGE?45/46?FOR?INITIALIZATION?SPECIFICATION!
	//?according?to?datasheet?we?need?at?least?40ms?after?power?rises?above?2.7V
	//?before?sending?commands.?Arduino?can?turn?on?way?befer?4.5V?so?we‘ll?wait?50
	delayMicroseconds（50000）;?
??
	//?Now?we?pull?both?RS?and?R/W?low?to?begin?commands
	expanderWrite（_backlightval）;	//?reset?expanderand?turn?backlight?off?（Bit?8?=1）
	delay（1000）;

??	//put?the?LCD?into?4?bit?mode
	//?this?is?according?to?the?hitachi?HD44780?datasheet
	//?figure?24?pg?46
	
	//?we?start?in?8bit?mode?try?to?set?4?bit?mode
	write4bits（0x03）;
	delayMicroseconds（4500）;?//?wait?min?4.1ms
	
	//?second?try
	write4bits（0x03）;
	delayMicroseconds（4500）;?//?wait?min?4.1ms
	
	//?third?go!
	write4bits（0x03）;?
	delayMicroseconds（150）;
	
	//?finally?set?to?4-bit?interface
	write4bits（0x02）;?


	//?set?#?lines?font?size?etc.
	command（LCD_FUNCTIONSET?|?_displayfunction）;??
	
	//?turn?the?display?on?with?no?cursor?or?blinking?default
	_displaycontrol?=?LCD_DISPLAYON?|?LCD_CURSOROFF?|?LCD_blinkOFF;
	display（）;
	
	//?clear?it?off
	clear（）;
	
	//?Initialize?to?default?text?direction?（for?roman?languages）
	_displaymode?=?LCD_ENTRYLEFT?|?LCD_ENTRYSHIFTDECREMENT;
	
	//?set?the?entry?mode
	command（LCD_ENTRYMODESET?|?_displaymode）;
	
	home（）;
??
}



/**********?high?level?commands?for?the?user!?*/
void?LiquidCrystal_I2C::clear（）{
	command（LCD_CLEARDISPLAY）;//?clear?display?set?cursor?position?to?zero
	delayMicroseconds（2000）;??//?this?command?takes?a?long?time!
}

void?LiquidCrystal_I2C::

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\
?????文件????????8280??2011-05-06?17:59??LiquidCrystal_I2C\LiquidCrystal_I2C.cpp
?????文件????????3344??2010-05-27?02:49??LiquidCrystal_I2C\LiquidCrystal_I2C.h
?????文件???????41564??2009-09-12?00:15??LiquidCrystal_I2C\LiquidCrystal_I2C.o
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\examples\
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\examples\CustomChars\
?????文件????????1487??2010-05-27?02:53??LiquidCrystal_I2C\examples\CustomChars\CustomChars.pde
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\examples\HelloWorld\
?????文件?????????360??2010-05-27?02:53??LiquidCrystal_I2C\examples\HelloWorld\HelloWorld.pde
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\examples\LCD2004HelloWorld\
?????文件?????????607??2011-08-05?12:42??LiquidCrystal_I2C\examples\LCD2004HelloWorld\LCD2004HelloWorld.pde
?????目錄???????????0??2012-11-02?08:30??LiquidCrystal_I2C\examples\SerialDisplay\
?????文件?????????787??2010-05-27?02:53??LiquidCrystal_I2C\examples\SerialDisplay\SerialDisplay.pde
?????文件????????1095??2009-09-12?00:15??LiquidCrystal_I2C\keywords.txt