#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/io.h>
#include "send.h"
#include <avr/twi.h>

// init slave
//
//
void init_twi_slave (uint8_t addr) {

	//DDRC = 0xff;

	// set slave addr to 1
	// do not respond to general call
	TWAR = (addr<<1)|0;

	// enable twi interface and interrupt and acks
	TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA);
	TWCR |= TWSTO;
}

// recv data
//
//
volatile uint8_t do_things;
volatile uint8_t value;
volatile uint8_t index;
SIGNAL (SIG_2WIRE_SERIAL) {

	// grab the value
	value = TWDR;
	//if(value != 2)
	//reset
	if(TWSR == 0)
		TWCR |= TWSTO;
	
	send_byte (value); //send over the serial connection

	// do things
	//do_things = 1;
	
	// allow i2c to continue
	TWCR |= _BV(TWINT);
	//PORTC = 0xFF;
}

// print data
//
//
int main (void) {

	init_twi_slave (1);
	send_init ();
	DDRB = 0xFF;
	sei ();
	do_things = 0;
	uint16_t sleep;
	uint8_t i;

	while (1) {
		PORTB = ~TWSR;
		if(TWSR == 0)
			TWCR |= TWSTO;
	}
	
	return 0;
}