// I2C Slave Code : Antero Metso Fab Academy 2022 group work - 18.11.2022
// References:
// https://docs.particle.io/reference/device-os/api/wire-i2c/onrequest/
// https://github.com/ControlEverythingCommunity/MS5805-02BA01/blob/master/Arduino/MS5805_02BA01.ino
// https://github.com/Koepel/How-to-use-the-Arduino-Wire-library/wiki/How-to-make-a-reliable-I2C-bus
// https://www.instructables.com/ATTiny-USI-I2C-The-detailed-in-depth-and-infor/
// https://docs.arduino.cc/learn/communication/wire

#include <Wire.h>
void setup() {
  // Set the speed of the bus
  Wire.setClock(1000000L); // A very low frequency of 10000Hz

  // Join as a slave
  

  // Set serial bus speed 
  Serial.begin(9600);
  Serial.println("I AM ALIVE!");
   Wire.begin(10);
  //set handles for the functions
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);
}

// Main (empty) loop
void loop() {
  
  delay(1000);
  }

// Function for handling received characters from the bus.
void receiveEvent(int howmany){
  Serial.print("Master: ");
  while (1 < Wire.available()) { 
    char c = Wire.read();       
     Serial.print(c);            
  }

  
  Serial.println(".");
}

// Function for handling character requests from the Master

void requestEvent()
{
 
  Wire.write(byte('O'));
  Wire.write(byte('H'));
  Wire.write(byte('!'));
  Wire.write(('\n'));

}