// UART

/*
String sendMessage;
String receivedMessage;

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);
}

void loop() {
  while (Serial1.available() > 0) {
    char receivedChar = Serial1.read();
    if (receivedChar == '\n') {
      Serial.println(receivedMessage);
      receivedMessage = "";
    } else {
      receivedMessage += receivedChar;
    }
  }

  if (Serial.available() > 0) {
    char inputChar = Serial.read();
    if (inputChar == '\n') {
      Serial1.println(sendMessage);
      sendMessage = "";
    } else {
      sendMessage += inputChar;
    }
  }
}
*/

// I2C

/*
#include <Wire.h>

int x = 0;

void setup() {
  Wire.begin(0x69); // Slave Address
  Wire.onReceive(receiveEvent);
  Serial.begin(115200);
}

void loop() {
  Wire.beginTransmission(4);
  Wire.write("x is ");
  Wire.write(x);
  Wire.endTransmission();

  x++;
  delay(500);
}

void receiveEvent(int howMany) {
  while (Wire.available() > 1) {
    char c = Wire.read();
    Serial.print(c);
  }
  int val = Wire.read();
  Serial.println(val);
}
*/




// SPI

/*
#include <SPI.h>

uint8_t CS_PIN = 10;

void setup() 
{
  pinMode(CS_PIN, OUTPUT);
  digitalWrite(CS_PIN, HIGH);

  SPI.begin();
}

void loop() 
{
  SPI.beginTransaction(SPISettings(14000000, MSBFIRST, SPI_MODE0));
  digitalWrite(CS_PIN, LOW);
  SPI.transfer(0xFF);
  digitalWrite(CS_PIN, HIGH);
  SPI.endTransaction();
}
*/