#define F_CPU 3333333UL
#define BAUD_9600 ((4UL*F_CPU)/9600)

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

/*
In this exercise we will set up and use UART communication.
The embedded debugger has a virtual com port that we will use to communicate with the computer.

*/


void uart_init(unsigned long baud){
	
	//In this function, we want to initialize the UART.
	//Chapter 24.3 in datasheet tells us how this is done:
	
	//Set TX pin as output
 	//Set the TX pin high
	//Fill in the baud rate in the 2 BAUD registers. (High and Low, you will need to do some bit shifting here)
	//We are going to use "async" mode, 1 stop bit and 8 bit character size.
	//Enable RX and TX
	
	//Enable interrupt on incoming data
}

// function to transmit data
void uart_transmit(unsigned char data){
	//In this function we will be send data.
	
	//First we should check that there isn't already data being sent
	//	-if there is, we should probably wait for it to finish first
	
	//Put our new data into se sending register

}


int main(void)
{
	//Initialize the UART with our function. 
	//We will be using a baudrate of 9600 (defined as BAUD_9600 at the top of the file)
	
	sei(); //Enable global interrupt, important for anything here to work
	
    while (1) 
    {
		//We don't really need to do anything here.
		//the ISR will handle receiving. 
    }
}


//Interrupt service routine for the receiver.
ISR(USART0_RXC_vect){
	
	//Read out the received data to a variable
	
	//Do things with data. Perhaps send something back? 
	

}