#include <avr/io.h>
#include <avr/interrupt.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <util/delay.h>
#include <avr/iotn2313.h>
// 19200, 8 бит, 2 стоповых

#define USART_BAUDRATE 19200
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)


char ReceivedByte;

char s[] = "Hello";

int main(void)
{

DDRD = 255;
PORTD =255;
DDRB = 255;
PORTB = 255;
sei();
UCSRB |= (1 << RXEN) | (1 << TXEN) | (1 << RXCIE) | (1 << TXCIE);
UCSRC |= (1 << USBS) | (1 << UCSZ0) | (1 << UCSZ1);
UBRRL = BAUD_PRESCALE;
UBRRH = (BAUD_PRESCALE >> 8);


while ((UCSRA & (1 << UDRE)) == 0) {};
UDR = s[1];

while(1)
{
_delay_ms(300);
};

return 0;
};


ISR(USART_RX_vect)
{

ReceivedByte = UDR;
switch (ReceivedByte)
{
case ('1'):

while ((UCSRA & (1 << UDRE)) == 0) {};
UDR = s[2];
break;
}


UDR = ReceivedByte; // Echo back the received byte back to the computer

return;
};