#define F_CPU 8000000UL
#define UART_BAUD_RATE 9600L
#define UART_BAUD_CALC(UART_BAUD_RATE,F_CPU) ( (F_CPU)/(UART_BAUD_RATE*16L)-1 )


#include <stdio.h>

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/eeprom.h>


uint8_t uart_complete=0;
char data_string[200];

int uart_putc(unsigned char c)
{
	while (!(UCSRA & (1<<UDRE)))
	{
	}
	
	UDR = c;
	return 0;
}

void uart_puts (const char *s)
{
	while (*s) {
		uart_putc(*s);
		s++;
	}
}

int main(void)
{
	lcd_ini();
	
	DDRB=0xFF;
	
	UCSRB|= (1<<RXEN) | (1<<TXEN) | (1<<RXCIE);
	UCSRC|= (1<<UCSZ0) | (1<<UCSZ1);
	
	UBRRH= (uint8_t) (UART_BAUD_CALC(UART_BAUD_RATE,F_CPU)>>8);
	UBRRL= (uint8_t) UART_BAUD_CALC(UART_BAUD_RATE,F_CPU);
	
	sei();
	
    while(1)
    {
		if (uart_complete==1)
		{
			uart_complete=0;		
							
			uart_puts(data_string);
		}
		_delay_us(1);
    }
}



ISR (USART_RXC_vect)
{	
	unsigned char next_byte;
	uint8_t uart_str_count = 0;
	
	next_byte=UDR;
	
	if (uart_complete==0 && next_byte!='\n')
	{
			if (uart_str_count<=200)
			{
				data_string [uart_str_count] = next_byte;
			}
			else
			{
				uart_str_count=0;
				next_byte=0;
				uart_complete=1;
			}
			uart_str_count++;		
	}
	else
	{
		uart_complete=1;
		next_byte=0;
		uart_str_count=0;
	}

}