// I2C Master 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() {
 Wire.setClock(1000000L);
  Wire.begin(); // Join as master
  Serial.begin(9600);
  // put your setup code here, to run once:

}
int received[4]={0,0,0,0};
int reading='@';
void loop() {
  
// Write data from master to host

//Serial.println("Master writes to 10.");
Wire.beginTransmission(10);

Wire.write(byte('M'));

Wire.write(byte('A'));

Wire.write(byte('S'));

Wire.write(byte('T'));
Wire.write(byte('E'));
Wire.write(byte('R'));

Wire.write(byte('\n'));
//Serial.println("endTransmission to 10: ");
//Serial.println(Wire.endTransmission());

// End transmission to Slave #10
Wire.endTransmission();

delay(70);


// Request data from Master 
//Serial.print("Wire requestFrom: ");
 //Serial.println(Wire.requestFrom(10, 4));    // (address,quantity)
 Wire.requestFrom(10,4); // Request data from the Slave #10 (address, quantity)
  Serial.print("Slave: ");
  while(Wire.available()){   // slave may send less than requested
    char c = Wire.read();    // receive a byte as character
    Serial.print(c);         // print the character
  }
 

  delay(250);
  Serial.println(" ");
}