#include <Wire.h>
#include "wiring_private.h"

TwoWire myWire(&sercom3, 0, 1);   // Create the new wire instance assigning it to pin 0 and 1

void setup()
{
  myWire.begin(2);                // join i2c bus with address #2

  //  use the internal function that reassigns the pins
  pinPeripheral(0, PIO_SERCOM);   //Assign SDA function to pin 0
  pinPeripheral(1, PIO_SERCOM);   //Assign SCL function to pin 1

  myWire.onRequest(requestEvent); // register event
}

void loop()
{
  delay(100);
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
  myWire.write("hello "); // respond with message of 6 bytes
                          // as expected by master
}

// Attach the interrupt handler to the SERCOM
extern "C" {
  void SERCOM3_Handler(void);

  void SERCOM3_Handler(void) {
    myWire.onService();
  }
}