/*
 * helloi2c
 */


#include <Wire.h>           // standard i2c arduino lib

#include "LCDi2c4bit.h"     // this is our new library, note quite in 'system space' yet





/*
 * create an instance of the lcd i2c 4bit class.
 *
 * this does a lot of stuff!  you get back a 'filled in' variable called 'lcd'
 * and the screen is initialized and ready for you to write to.
 */

#define backlightPin  9            // a pwm-capable pin, so I picked #9
LCDI2C4Bit lcd = LCDI2C4Bit(0xa7, 2, 16, backlightPin);   //0xa7 is the hardware addr of the i2c chip




/*
 * in arduino-land, there is always a setup().  this is ours.
 */

void 
setup()
{

  /*
   * we have to join the i2c bus.  just call this routine at the top, as well.
   */

  Wire.begin();



  /*
   * start of useful example program
   */

  lcd.init();

  // lets start with a clear screen (never assume it comes to you, clean)
  lcd.clear();

  // turn on backlight, full blast
  lcd.backLight(255);

  // explicitly set our cursor position
  lcd.cursorTo(0, 0);  // first row, first column
  
  // print the text 'here' at last-set cursor pos
  lcd.print("LinuxWorks Labs");

  // pause a bit
  delay(3000);

  // re-clear our display
  lcd.clear();

  /*
   * print more stuff and then exit
   */

  lcd.cursorTo(0, 0);  // first row, first column
  lcd.print("Hello LinuxWorks");

  lcd.cursorTo(1, 0);  // 2nd row, first column
  lcd.print("i2c LCD working!");


  // pause a bit more
  delay(3000);
}





/*
 * in arduino-land, there is always a loop().  this is ours.
 */

void 
loop()
{

  /*
   * fade-down the backlight pin
   */

  for (int i=255; i>=0; i--) {
    lcd.backLight(i);
    delay(10);
  }


  // pause a bit
  delay(200);


  /*
   * fade-up the backlight pin
   */

  for (int i=0; i<255; i++) {
    lcd.backLight(i);
    delay(10);
  }

  delay(1000);
}