/*
 * Debugger_Demo.c
 *
 */ 


#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>


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


int uart_transmit(char data, FILE* stream){
	while (!(USART0.STATUS & (1 << USART_DREIF_bp))){
		//Wait for ongoing transmission to finish (if there is one)
	}
	USART0.TXDATAL = data; //Put new data in register
	return 0;
}


void uart_init(unsigned long baud){
	
	
	PORTB.OUTSET |= (1 << PIN2_bp);
	PORTB.DIRSET |= (1 << PIN2_bp); 	
	USART0.BAUD = baud; 	//Set baudrate
	USART0.CTRLB |= (1 << USART_RXEN_bp) | (1 << USART_TXEN_bp);	//Enable RX and TX
	
	USART0.CTRLA |= (1 << USART_RXCIE_bp); //Enable interupts on RX
	
	fdevopen(uart_transmit, NULL); //Allows the use of printf()
	
}


ISR(USART0_RXC_vect){
	
	uint8_t data = USART0.RXDATAL; //We must read the data to clear the interrupt flag
		
}




int main(void)
{
	uart_init(BAUD_9600);
	
	
    while (1) 
    {
		
    }
}