#ifndef LiquidCrystalShift_h
#define LiquidCrystalShift_h

#include <inttypes.h>
#include "Print.h"
#include "Arduino.h"

// 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_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00

//Control del 74HC595
//const uint8_t dataPin=5;
//const uint8_t latchPin=6;
//const uint8_t clockPin=7;
  
class LiquidCrystalShift : public Print {
public:
  LiquidCrystalShift(uint8_t dataPin, uint8_t latchPin, uint8_t clockPin, uint8_t rs, uint8_t enable,
		uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);

  void init(uint8_t rs, uint8_t rw, uint8_t enable,
	    uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
	    uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7,
            uint8_t dataPin, uint8_t latchPin, uint8_t clockPin);
    
  void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);

  void clear();

  void noDisplay();
  void display();
  void shiftWrite(uint8_t, uint8_t);
  void setCursor(uint8_t, uint8_t); 
  virtual size_t write(uint8_t);
  void command(uint8_t);
  
  using Print::write;
private:
  void send(uint8_t, uint8_t);
  void write4bits(uint8_t);
  void pulseEnable();
  
  uint16_t val_shift; //Valor del shift register
  //uint8_t val_shift1; //Valor del shift register

  uint8_t _rs_pin; // LOW: command.  HIGH: character.
  uint8_t _rw_pin; // LOW: write to LCD.  HIGH: read from LCD.
  uint8_t _enable_pin; // activated by a HIGH pulse.
  uint8_t _data_pins[8];
  uint8_t _dataPin;
  uint8_t _latchPin;
  uint8_t _clockPin;
  
  uint8_t _displayfunction;
  uint8_t _displaycontrol;
  uint8_t _displaymode;

  uint8_t _initialized;

  uint8_t _numlines,_currline;
  
};

#endif