/* I2C Echo Example */
#include "../I2CSlave/I2CSlave.h"

#define I2C_ADDR 0x20

volatile uint8_t data;
volatile uint8_t final;
void I2C_received(uint8_t received_data)
{
  data = received_data;
}

void I2C_requested()
{
  I2C_transmitByte(data);
}
void I2C_challenge() {
  I2C_transmitByte(data*3);
}

void setup()
{
  // set received/requested callbacks
  I2C_setCallbacks(I2C_received, I2C_requested);

  // init I2C
  I2C_init(I2C_ADDR);
  // init output gpio
  DDRB = 0b00000001;  
}

int main()
{
  setup();

  // Main program loop
  while(1) {
	if(data != 4) {
		I2C_challenge();
	}
	else {
		//PORTB |= 1<<1;			
		data = 2;
		I2C_requested();
		 
	}
  }
}