/*                     PIC16F84
 *                   .-----------.
 *                  -|RA2     RA1|- PUSH BUTTON
 *                  -|RA3     RA0|-
 *                  -|RA4    OSC1|- XT CLOCK pin1, 27pF to GND
 *      PUSH BUTTON -|MCLR   OSC2|- XT CLOCK pin2, 27pF to GND
 *              GND -|Vss     Vdd|- +5v
 *           LCD EN -|RB0     RB7|- LCD D7
 *           LCD RS -|RB1     RB6|- LCD D6
 *              LED -|RB2     RB5|- LCD D5
 *                  -|RB3     RB4|- LCD D4
 *                   '-----------'       
 *
 *  PUSH BUTTON = PIN - BUTTON - GND
 *                PIN - 10k - +5v
 *
 *  LED = PIN - LED - 100 ohm - GND     
 */

#include <pic.h>
#include "lcd.c"

__CONFIG(WDTDIS & XT & UNPROTECT);

main(void) 
{
  unsigned int i = 1;
  unsigned int j = 1;

  TRISA = 0b00000010; 
  TRISB = 0b00000000; 

  lcd_initialize(); 
  lcd_overwrite_string("Hello World!");

  for (;;) 
  {
    if (RA1 == 0)
    {
      RB2 = 1;
      j = 0;
    }
    else
    {
      RB2 = 0;
      if (j==0)
      {
        j=1;
        i++;
        if (i==2)
        {
          lcd_write_string_at_second_line("Hello Again!");
        }
        else if (i==3)
        {
          lcd_draw_logo();
        }
        else
        {
          lcd_overwrite_string("Clear Screen.");
        }
      }
    }
  }
}