/*  fifoV3
     22/12/23
     This should run on any board as it does not require any pins
     Just the Serial monitor.

     FIFO  First in First Out

     This sketch controls 2 different arrays.
     Although I could have used a 2 dimensional integer array it would have used
     more memeory than the seperate ineteger and byte arrays.


*/

#include <OneWire.h>
#include <DallasTemperature.h>
#include "Adafruit_SHT31.h"

// Name des Sensors (sht31)
Adafruit_SHT31 sht31 = Adafruit_SHT31();


// Data wire is plugged into pin 23 on the Arduino
#define ONE_WIRE_BUS 2
// Setup a OneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);
// Pass OneWire reference to Dallas Temperature
DallasTemperature sensors(&oneWire);

byte readPosition;
byte writePosition;
byte byteSwap;

// (48%) OK
int fifoBuffer[256];
byte fifoByteBuffer[256];

unsigned long currentMillis;
unsigned long writeMillis;
unsigned long readMillis;
int randomWriteTiming;

void setup() {
  Serial.begin(9600);
  Serial.println("fifoV3");

  pinMode(ONE_WIRE_BUS, OUTPUT);
  sensors.begin(); //Start up the library

  //this loop fills the first 30 items in the fifo buffer to prefill with some info.
  for (int q = 0; q < 30; q++) {
    fifoBuffer[writePosition] = q;
    if(byteSwap > 0){
      byteSwap = 0;  
    }else{
      byteSwap = 1;  
    }
    fifoByteBuffer[writePosition] = byteSwap;
    writePosition++;
  }

  // SHT35 starten, im Fehlerfall Meldung anzeigen
  Serial.println("SHT35 Test");
  if (!sht31.begin()) Serial.println("Sensor SHT35 nicht gefunden");
  else Serial.println("Sensor SHT35 gefunden!");
}

void loop() {
  currentMillis = millis();

  if (currentMillis - readMillis >= 1000) { //1 second spacing for read
    readMillis = currentMillis;
    if (readPosition != writePosition) {
      Serial.print("R ");
      Serial.print(fifoBuffer[readPosition]);
      Serial.print(":");
      Serial.println(fifoByteBuffer[readPosition]);
      readPosition++;
      /* Not required any more, using a byte and a 256 element array
       *  The line readPosition++; leads to
       *  253
       *  254
       *  255
       *  0....goes back to Zero as the byte value has been exceeded
       *  1
       *  2
       *  
      if (readPosition > 99) {
        readPosition = 0;
      }
      */
    }
  }

  if (currentMillis - writeMillis >= randomWriteTiming) {
    writeMillis = currentMillis;
    randomWriteTiming = random(500, 2000); //generate random times to write between 0.5 and 2 seconds
    fifoBuffer[writePosition] = writePosition;
    if(byteSwap > 0){
      byteSwap = 0;  
    }else{
      byteSwap = 1;  
    }
    fifoByteBuffer[writePosition] = byteSwap;
    
    Serial.print("W ");
    Serial.print(fifoBuffer[writePosition]);
    Serial.print(":");
    Serial.println(fifoByteBuffer[writePosition]);
    writePosition++;
  }



  // Sensorwerte erfassen (Luftfeuchtigkeit, Temperatur)
  String Temperatur = String(sht31.readTemperature());
  String Luftfeuchtigkeit = String(sht31.readHumidity());

  // . durch , ersetzen
  Temperatur.replace(".", ",");
  Luftfeuchtigkeit.replace(".", ",");

  // Temperatur anzeigen
  Serial.println("Temperatur: " + Temperatur + "°C");

  // Luftfeuchtigkeit anzeigen
  Serial.println("Luftfeuchtigkeit: " + Luftfeuchtigkeit + "%");

  Serial.println("------------------------");

}