enum class bytePos
{
  LOW_BYTE,
  HIGH_BYTE
};

auto byteSelect16(bytePos pos, uint16_t uiInput) -> uint8_t;

uint16_t uiTest = 0xE402;

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

  byte by = byteSelect16(bytePos::LOW_BYTE, uiTest);

  Serial.println("Low Byte: "+ String(by));
 
  by = byteSelect16(bytePos::HIGH_BYTE, uiTest);
  Serial.println("High Byte: "+ String(by));

}

void loop() {
  // put your main code here, to run repeatedly:

  

}

auto byteSelect16(bytePos pos, uint16_t uiInput) -> uint8_t
{
    switch (pos)
    {
    case bytePos::LOW_BYTE:
        return uiInput & 0xFF;
        break;
    case bytePos::HIGH_BYTE:
        return (uiInput >> 8) & 0xFF;
        break;
    default:
        return 0xFF;
        break;
    }
}