/*
  T45_Slave_with_Serial_monitor.ino
  by Lucas Lim 
  created on 10/5/2020

  Purpose: 1) To receive reading from MASTER, and
              display reading to serial monitor
              on user pc/notebook via FTDI 

    
  The work is provided for academic purpose for Fab Academy 2020.
  Users accept all as is, no warranty is provided, no call/email
  from users will get a response. Users accept all liability.  
*/

#include <SoftwareSerial.h>
#include <TinyWireS.h>

#define i2c_slave 2

int received = 0;           // receive cm reading
const int tx = 3;           // PB3 - Arduino pin no. 3
const int rx = 4;           // PB4 - Arduino pin no. 4
const int ledPin = 1;       // PB1 - Arduino pin no. 1

SoftwareSerial mySerial(rx, tx);



// Gets call when receive a request from MASTER and response with a message
void requestEvent() {
  TinyWireS.send(2);
}


void receiveEvent() {
  received = TinyWireS.receive();
}


void blink_led(int times)
{
    while(times--)
    {
        digitalWrite(ledPin, HIGH);
        delay(500);
        digitalWrite(ledPin, LOW);
        delay(500);
    }
}


// display reading to serial monitor
void display_reading()
{
    //if (TinyWireS.available()) {
      received = TinyWireS.receive();
      mySerial.println(received);
    //}
}




void setup() {
  TinyWireS.begin(i2c_slave);            // join i2c network as slave

  mySerial.begin(9600);                  // start serial for output

  TinyWireS.onRequest(requestEvent);     // listen to request from master node
  TinyWireS.onReceive(receiveEvent);     // function to be called when a slave device receives a transmission from a master

  pinMode(ledPin, OUTPUT);
}


void loop() {
  //display reading to serial monitor
  mySerial.println(received);

  // This needs to be here, Detects a stop sending command.
  TinyWireS_stop_check();
}