/*  Name     : Main.c
 *  Purpose  : Source code for LCD Interfacing with ATMEGA16.
 *  Author   : GEMICATES
 *  Date     : 10-07-2017
 *  Website  : www.gemicates.org
 *  Revision : None
 */

#include<avr/io.h>				// Header File for ATMEGA16
#include<util/delay.h>			        // Include Delay Function

#define LCD PORTD				// To Set Port D as LCD'S DATA I/P Purpose
#define CNT PORTA				// To Set Port A as LCD'S Command Purpose
#define RS PA0					// To Set Port A Pin 0 as Register select pin
#define RW PA1					// To Set Port A Pin 1 as Read write pin
#define EN PA2					// To Set Port A Pin 2 as Enable pin

/* SUBROUTINE FUNCTIONS */

                                                // FUNCTION TO SEND LCD COMMAND  

void lcd_cmd(unsigned char cmd)
{
	LCD=cmd;
	CNT=(0<<RS);
	CNT=(0<<RW);
	CNT=(1<<EN);
	_delay_ms(1);
	CNT=(0<<RS);
	CNT=(0<<RW);
	CNT=(0<<EN);
	_delay_ms(50);
	return;
}

                                                // FUNCTION TO SEND LCD DATA 

void lcd_data(unsigned char data)
{
	LCD=data;
	CNT=(1<<RS);
	CNT=(0<<RW);
	CNT=(1<<EN);
	_delay_ms(1);
	CNT=(1<<RS);
	CNT=(0<<RW);
	CNT=(0<<EN);
	_delay_ms(50);
	return;
}

                                                // FUCTION TO PRINT STRING 
void lcd_string(unsigned char *str)
{
	int i;
	  while(str[i] != '\0')
		{
			lcd_data(str[i]);
			i++;
		}
}

/* MAIN FUNCTION */
void main()
{
	DDRD=0xff;				 // To Set Port A as Output
	DDRA=0x07;				 // To Set Port A as Output

			lcd_cmd(0x38);		 // For using 8-bit 2 row mode and 5x7 Dots of LCD
			_delay_ms(1);
		
			lcd_cmd(0x0e);		 // Turn display ON for cursor blinking
			_delay_ms(1);
		
			lcd_cmd(0x0c);		 // Display On cursor Off	
			_delay_ms(1);
		
			lcd_cmd(0x01);		 // Clear screen
			_delay_ms(1);
		
			_delay_ms(50);
			
			lcd_cmd(0x87);		 // Bring cursor to position 7 of ROW 1
			
			lcd_data('H');		 // Print Char
			
			lcd_data('I');		 // Print Char	
		
			lcd_data('!');		 // Print Char
		
			lcd_cmd(0xc4);		 // Bring cursor to position 4 of ROW 2
		
			lcd_string("**GUYS**");	 // Print String
			_delay_ms(1000);
			
			lcd_cmd(0x01);		 // Clear screen
			_delay_ms(1);
		
			lcd_cmd(0x83);		 // Bring cursor to position 3 of ROW 1
	
			lcd_string("WELCOME TO");// Print String
			_delay_ms(500);
			
			lcd_cmd(0xC4);		 // Bring cursor to position 4 of ROW 2
		
			lcd_string("GEMICATES"); // Print String
			_delay_ms(1000);
		while(1)
		{
			lcd_cmd(0x80);		 // Bring cursor to position 0 of ROW 1							
		
			lcd_string("PROGRESS THROUGH");
		
			lcd_cmd(0x1C);		 // Shift entire display left
		
			lcd_cmd(0xC3);		 // Bring cursor to position 3 of ROW 2							
		
			lcd_string("INNOVATION");
		
			lcd_cmd(0x18);		 // Shift entire display right
		}
}