/*
 * main.c
 *
 * Created: 4/23/2019 3:50:01 PM
 *  Author: dspuser
 */
#include <avr/io.h>
#include "Serial.h"
#include <util/delay.h>
int main(){
	uart_init();
	uart_transmit('0');
	while(1){
		char receive = uart_receive();
		_delay_ms(300);
		uart_transmit(receive);
	}
}


--------
/*
 * Serial.c
 *
 * Created: 4/23/2019 3:49:18 PM
 *  Author: dspuser
 */
#include <avr/io.h>
#include "Serial.h"
void uart_init(){
	UCSRB = (1 << 3) | (1 << 4);//activam 3 si 4 corespunzator pentru TXEN respectiv RXEN, adica activam receptia+transm
	UCSRC&=~(1 << URSEL);//il punem pe 0 pentru a avea acces la UBRRH
	UBRRH = _UBRR >> 8;
	UBRRL = _UBRR;
	UCSRC = (1 << 2) | (1 << 1) | (1 << 7);//Activam UCSZ0,UCSZ1, iar UCSZ2 ramane pe 0 => 8 bits per character
	PORTD|=0x2;
}

void uart_transmit(char character){
	// De asemenea, bitii 4 si 5 sunt pe 0 pentru ca nu vrem paritate(UPM0 si UPM1) iar bitul 3 pentru pentru a avea un bit de stop, iar bitul 2 asemenea pt mod asincron
	while((UCSRA&(1<<UDRE))==0);//asteptam pentru un transmit buffer gol
	UDR=character;//punem in UDR ce vrem sa transmitem
}

char uart_receive(){
	while (!(UCSRA & (1<<RXC)));//asteptam primirea datelor
	return UDR;//returnam data primita de la buffer

}

---
/*
 * Serial.h
 *
 * Created: 4/23/2019 3:49:35 PM
 *  Author: dspuser
 */
#include <avr/io.h>
#ifndef F_CPU
#define F_CPU 14745600UL
#ifndef _BAUDRATE
#define _BAUDRATE 9600
#ifndef _UBRR
#define _UBRR 0x5F //folosim formula din lab UBRR=(Fosc/(16*BaudRate))-1 => 95 => hex: 0x5F
void uart_init();
void uart_transmit(char character);
char uart_receive();
#endif
#endif
#endif