LCD1602_I2C.h

#ifndef _LCD1602_I2C_
#define  _LCD1602_I2C_

#define uchar unsigned char
#define uint unsigned int

#define En B00000100  // Enable bit
#define Rw B00000010  // Read/Write bit
#define Rs B00000001  // Register select bit


#define I2C_HIGH 1
#define I2C_LOW 0

// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80

// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00

// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00

// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00

// flags for function set
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_5x8DOTS 0x00

// flags for backlight control
#define LCD_BACKLIGHT 0x08
#define LCD_NOBACKLIGHT 0x00

void init_LCD1602();
void init_I2C();
void I2C_start();
void I2C_stop();

void I2C_write_data(uchar dat);
void I2C_write_com(uchar dat);
void I2C_write_byte(uchar dat);
void I2C_sned(uchar dat, uchar mode);
void I2C_write_expender(uchar dat);
void I2C_ACK();

void display();
void clear();
void home();
void print_str(uchar * dat);
#endif