#ifndef LiquidCrystal_t6a34_h
#define LiquidCrystal_t6a34_h

#include <inttypes.h>
#include "Print.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. t6a34 datasheet has these sets of bits swapped, ie increment/decrement is 0x02
// have left this as the hitachi default until confirmed
#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_BLINKMODE 0x10 //determines whether blink does reverse video or all on of pixels for t6a34
#define LCD_NOBLINKMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x7DOTS 0x00

// flags for register select
#define IR_WRITE 0x00
#define DR_WRITE 0x02
#define LER1_WRITE 0x01
#define LER2_WRITE 0x03

#define LED3 0x0001
#define LED4 0x0002
#define LED6 0x0004
#define LED2 0x0100

#define pwmRegister  OCR1B                             //the logical pin, can be set to OCR1A or B

#define	clk_period 8

class LiquidCrystal : public Print {
public:
  LiquidCrystal(uint8_t data_in, uint8_t clk);
  LiquidCrystal(uint8_t data_in, uint8_t data_out, uint8_t clk);
   
  void init(uint8_t data_in, uint8_t data_out, uint8_t clk);
    
  void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x7DOTS);

  void clear();
  void home();

  void noDisplay();
  void display();
  void noBlink();
  void blink();
  void noCursor();
  void cursor();
  void scrollDisplayLeft();
  void scrollDisplayRight();
  void leftToRight();
  void rightToLeft();
  void autoscroll();
  void noAutoscroll();

  void createChar(uint8_t, uint8_t[]);
  void setCursor(uint8_t, uint8_t); 
  virtual size_t write(uint8_t);
  void command(uint8_t);
  void setLeds(uint16_t);
private:
  void send(uint8_t, uint8_t);
    
  uint8_t _sid_pin;  // data in to t6a34.
  uint8_t _sod_pin;  // data out from t6a34.
  uint8_t _sclk_pin; // data valid on rising edge.
  
  uint8_t _displayfunction;
  uint8_t _displaycontrol;
  uint8_t _displaymode;

  uint8_t _initialized;

  uint8_t _numlines,_currline;

  //settings for pwm clock pin
  long period = clk_period;                   //the LCD clock period in microseconds (1=1MHz, 2=500kHz)
  int duty = 512;                             //duty as a range from 0 to 1024, 512 is 50% duty cycle
  int prescale[6] = {0, 1, 8, 64, 256, 1024}; //the range of prescale values
  const int clear_delay = 410*clk_period;
  const int home_delay = 410*clk_period;
  const int cmd_delay = 20*clk_period;
};

#endif