/* Name: main.c
 * Author: Nathan Williams
 * 2011
 */

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

#define TRANSMIT
//#define RECEIVE

int main(void)
{
    /* insert your hardware initialization here */
    PORTA = _BV(PA1); //set high
    DDRA  = _BV(PA1); //source current
    
    DDRB  = _BV(PB0);

    //USART init
    //We want 9600, baud is set in a 12 bit register (high & low)

    UBRRH = 0;
    UBRRL = 12;
    
    UCSRA = (1<<U2X);
    UCSRB = (1<<RXEN)|(1<<TXEN); 
    UCSRC = (1<<UCSZ1)|(1<<UCSZ0);


#ifdef TRANSMIT
    for(;;)
    {
        if(!(PINA & _BV(PA1)))
        {
            /* Wait for empty transmit buffer */ 
            while ( !( UCSRA & (1<<UDRE)) );
            UDR = 'F';
            _delay_ms(100);
        }       
    }
#else
    for(;;)
    {
        /* Wait for data to be received */ 
        while ( !(UCSRA & (1<<RXC)) );
        /* Get and return received data from buffer */ 
        if(UDR == 'F')
        {
            PORTB |= _BV(PB0);
            _delay_ms(100);
            PORTB ^= _BV(PB0);
        }
    }
#endif
    return 0;   /* never reached */
}