#define F_CPU 8000000UL
#include <avr/io.h>
#include <util/delay.h>
#include <stdlib.h>
#include <inttypes.h>
#include <avr/pgmspace.h>
#include <string.h>
#define RS PB1
#define E PB0
#define LCD_dir DDRB
#define LCD_port PORTB

void LCD_cmd(unsigned char cmd)
{
	LCD_port=(LCD_port&0x0f)|(cmd&0xf0);
	LCD_port&=~(1<<RS);
	LCD_port|=(1<<E);
	_delay_us(1);
	LCD_port&=~(1<<E);
	
	_delay_us(200);
	
	LCD_port=(LCD_port&0x0f)|(cmd<<4);
	LCD_port|=(1<<E);
	_delay_us(1);
	LCD_port&=~(1<<E);
	
	_delay_ms(2);
}

void LCD_char(unsigned char ch)
{
	LCD_port=(LCD_port&0x0f)|(ch&0xf0);
	LCD_port|=(1<<RS);
	LCD_port|=(1<<E);
	_delay_us(1);
	LCD_port&=~(1<<E);
	
	_delay_us(200);
	
	LCD_port=(LCD_port&0x0f)|(ch<<4);
	LCD_port|=(1<<E);
	_delay_us(1);
	LCD_port&=~(1<<E);
	
	_delay_ms(2);
}

void LCD_string (char *str)
{
	for (int i=0; str[i] != 0; i++)
	{
		LCD_char(str[i]);
	}
}

void LCD_string_pos(char *str, int line, int pos)
{
	if ((line==1) && (pos<16))
	LCD_cmd((pos&0x0f)|0x80);
	else if((line=2) && (pos<16))
	LCD_cmd((pos&0x0f)|0xc0);
	while(*str)
	LCD_char(*str++);
}

void LCD_string_int(int n, int line, int pos)
{
	char buffer_LCD[10];
	itoa(n, buffer_LCD, 10);
	LCD_string_pos(buffer_LCD, line, pos);
}
void LCD_string_float(float n, int line, int pos)
{
	char buffer_LCD[20];
	dtostre(n, buffer_LCD, 5, 4);
	LCD_string_pos(buffer_LCD, line, pos);
	
}

void LCD_clear()
{
	LCD_cmd(0x01);
	_delay_ms(2);
	LCD_cmd(0x80);
	
}

void LCD_home()
{
	
	LCD_cmd(0x02);
}

void LCD_init()
{
	LCD_dir=0xff;
	_delay_ms(20);
	LCD_cmd(0x33);
	LCD_cmd(0x32);
	LCD_cmd(0x01);
	LCD_cmd(0x28);
	LCD_cmd(0x0C);
	LCD_cmd(0x06);
	LCD_cmd(0x1c);
	_delay_ms(2);
	LCD_cmd(0x80);
}

int main()
{
	LCD_init();
LCD_cmd(0x80);
	LCD_string("Dao Manh Tung");
	
  LCD_cmd(0xc0);
	LCD_string("ECE2022");
  LCD_cmd(0x05);
	while(1)
	{
		LCD_cmd(0x1c);
		_delay_ms(500);
	}
}