clcd8bit.c

#define F_CPU 16000000UL
#include "LCD.h"
#include <avr/io.h>
#include <util/delay.h>

void LCD_command(unsigned char command)
{
	LCD_CONTROL &= ~((1<<EN) | (1<<RS) | (1<<RW));
	_delay_us(1);
	LCD_DATABUS = command;
	LCD_CONTROL |= (1<<EN);
	_delay_us(1);
	LCD_CONTROL &= ~(1<<EN);
	_delay_us(40);
}

void LCD_data(unsigned char data)
{
	LCD_CONTROL &= ~((1<<EN) | (1<<RW));
	LCD_CONTROL |= (1<<RS);
	_delay_us(1);
	LCD_DATABUS = data;
	LCD_CONTROL |= (1<<EN);
	_delay_us(1);
	LCD_CONTROL &= ~(1<<EN);
	_delay_us(40);
}

void LCD_string(unsigned char command, char* string)
{
	LCD_command(command);
	while(*string != '\0')
	{
		LCD_data(*string);
		string++;
	}
}

 void LCD_init()
 {
	LCD_DATABUS_DDR = 0b11111111;
	LCD_CONTROL_DDR |= ((1<<EN) | (1<<RS) | (1<<RW));
	_delay_us(50);
	LCD_CONTROL |= ((1<<EN) | (1<<RS));
	_delay_us(50);
	LCD_CONTROL &= ~(1<<EN);
	_delay_us(50);
	
	LCD_command(0x38);
	LCD_command(0x0C);
	LCD_command(0x06);
	LCD_command(0x01);
	_delay_ms(10);
	
 }

clcd8bit.h

#ifndef LCD_H_
#define LCD_H_

#define LCD_DATABUS		PORTC
#define LCD_CONTROL		PORTA
#define LCD_DATABUS_DDR	DDRC
#define LCD_CONTROL_DDR	DDRA

#define RS 5
#define RW 6
#define EN 7

void LCD_command(unsigned char command);
void LCD_data(unsigned char data);
void LCD_string(unsigned char command, char* string);
void LCD_init();

#endif /* LCD_H_ */