Tonuino.ino

#include <DFMiniMp3.h>
#include <EEPROM.h>
#include <JC_Button.h>
#include <MFRC522.h>
#include <SPI.h>
#include <SoftwareSerial.h>
#include <avr/sleep.h>

/*
   _____         _____ _____ _____ _____
  |_   _|___ ___|  |  |     |   | |     |
    | | | . |   |  |  |-   -| | | |  |  |
    |_| |___|_|_|_____|_____|_|___|_____|
    TonUINO Version 2.1

    created by Thorsten Voß and licensed under GNU/GPL.
    Information and contribution at https://tonuino.de.
*/

// uncomment the below line to enable five button support
//#define FIVEBUTTONS

// uncomment the below line to stop playback when card is removed
//#define PAUSEONCARDREMOVAL

// delay for volume buttons
#define LONG_PRESS_DELAY 300

static const uint32_t cardCookie = 322417479;

// DFPlayer Mini
SoftwareSerial mySoftwareSerial(2, 3); // RX, TX
uint16_t numTracksInFolder;
uint16_t currentTrack;
uint16_t firstTrack;
uint8_t queue[255];
uint8_t volume;

struct folderSettings {
  uint8_t folder;
  uint8_t mode;
  uint8_t special;
  uint8_t special2;
};

// this object stores nfc tag data
struct nfcTagObject {
  uint32_t cookie;
  uint8_t version;
  folderSettings nfcFolderSettings;
  //  uint8_t folder;
  //  uint8_t mode;
  //  uint8_t special;
  //  uint8_t special2;
};

bool card_present = false;
bool card_present_prev = false;

// admin settings stored in eeprom
struct adminSettings {
  uint32_t cookie;
  byte version;
  uint8_t maxVolume;
  uint8_t minVolume;
  uint8_t initVolume;
  uint8_t eq;
  bool locked;
  long standbyTimer;
  bool invertVolumeButtons;
  folderSettings shortCuts[4];
  uint8_t adminMenuLocked;
  uint8_t adminMenuPin[4];
};

adminSettings mySettings;
nfcTagObject myCard;
folderSettings *myFolder;
unsigned long sleepAtMillis = 0;
static uint16_t _lastTrackFinished;

static void nextTrack(uint16_t track);
uint8_t voiceMenu(int numberOfOptions, int startMessage, int messageOffset,
                  bool preview = false, int previewFromFolder = 0, int defaultValue = 0, bool exitWithLongPress = false);
bool isPlaying();
bool checkTwo ( uint8_t a[], uint8_t b[] );
bool readCard(nfcTagObject *nfcTag);
void writeCard(nfcTagObject nfcTag);
void dump_byte_array(byte * buffer, byte bufferSize);
void adminMenu(bool fromCard = false);
bool knownCard = false;

// implement a notification class,
// its member methods will get called
//
class Mp3Notify {
  public:
    static void OnError(uint16_t errorCode) {
      // see DfMp3_Error for code meaning
      Serial.println();
      Serial.print("Com Error ");
      Serial.println(errorCode);
    }
    static void PrintlnSourceAction(DfMp3_PlaySources source, const char* action) {
      if (source & DfMp3_PlaySources_Sd) Serial.print("SD Karte ");
      if (source & DfMp3_PlaySources_Usb) Serial.print("USB ");
      if (source & DfMp3_PlaySources_Flash) Serial.print("Flash ");
      Serial.println(action);
    }
    static void OnPlayFinished(DfMp3_PlaySources source, uint16_t track) {
      //      Serial.print("Track beendet");
      //      Serial.println(track);
      //      delay(100);
      nextTrack(track);
    }
    static void OnPlaySourceOnline(DfMp3_PlaySources source) {
      PrintlnSourceAction(source, "online");
    }
    static void OnPlaySourceInserted(DfMp3_PlaySources source) {
      PrintlnSourceAction(source, "bereit");
    }
    static void OnPlaySourceRemoved(DfMp3_PlaySources source) {
      PrintlnSourceAction(source, "entfernt");
    }
};

static DFMiniMp3<SoftwareSerial, Mp3Notify> mp3(mySoftwareSerial);

void shuffleQueue() {
  // Queue für die Zufallswiedergabe erstellen
  for (uint8_t x = 0; x < numTracksInFolder - firstTrack + 1; x++)
    queue[x] = x + firstTrack;
  // Rest mit 0 auffüllen
  for (uint8_t x = numTracksInFolder - firstTrack + 1; x < 255; x++)
    queue[x] = 0;
  // Queue mischen
  for (uint8_t i = 0; i < numTracksInFolder - firstTrack + 1; i++)
  {
    uint8_t j = random (0, numTracksInFolder - firstTrack + 1);
    uint8_t t = queue[i];
    queue[i] = queue[j];
    queue[j] = t;
  }
  /*  Serial.println(F("Queue :"));
    for (uint8_t x = 0; x < numTracksInFolder - firstTrack + 1 ; x++)
      Serial.println(queue[x]);
  */
}

void writeSettingsToFlash() {
  Serial.println(F("=== writeSettingsToFlash()"));
  int address = sizeof(myFolder->folder) * 100;
  EEPROM.put(address, mySettings);
}

void resetSettings() {
  Serial.println(F("=== resetSettings()"));
  mySettings.cookie = cardCookie;
  mySettings.version = 2;
  mySettings.maxVolume = 25;
  mySettings.minVolume = 5;
  mySettings.initVolume = 15;
  mySettings.eq = 1;
  mySettings.locked = false;
  mySettings.standbyTimer = 0;
  mySettings.invertVolumeButtons = false;
  mySettings.shortCuts[0].folder = 0;
  mySettings.shortCuts[1].folder = 0;
  mySettings.shortCuts[2].folder = 0;
  mySettings.shortCuts[3].folder = 0;
  mySettings.adminMenuLocked = 0;
  mySettings.adminMenuPin[0] = 1;
  mySettings.adminMenuPin[1] = 1;
  mySettings.adminMenuPin[2] = 1;
  mySettings.adminMenuPin[3] = 1;

  writeSettingsToFlash();
}

void migrateSettings(int oldVersion) {
  if (oldVersion == 1) {
    Serial.println(F("=== resetSettings()"));
    Serial.println(F("1 -> 2"));
    mySettings.version = 2;
    mySettings.adminMenuLocked = 0;
    mySettings.adminMenuPin[0] = 1;
    mySettings.adminMenuPin[1] = 1;
    mySettings.adminMenuPin[2] = 1;
    mySettings.adminMenuPin[3] = 1;
    writeSettingsToFlash();
  }
}

void loadSettingsFromFlash() {
  Serial.println(F("=== loadSettingsFromFlash()"));
  int address = sizeof(myFolder->folder) * 100;
  EEPROM.get(address, mySettings);
  if (mySettings.cookie != cardCookie)
    resetSettings();
  migrateSettings(mySettings.version);

  Serial.print(F("Version: "));
  Serial.println(mySettings.version);

  Serial.print(F("Maximal Volume: "));
  Serial.println(mySettings.maxVolume);

  Serial.print(F("Minimal Volume: "));
  Serial.println(mySettings.minVolume);

  Serial.print(F("Initial Volume: "));
  Serial.println(mySettings.initVolume);

  Serial.print(F("EQ: "));
  Serial.println(mySettings.eq);

  Serial.print(F("Locked: "));
  Serial.println(mySettings.locked);

  Serial.print(F("Sleep Timer: "));
  Serial.println(mySettings.standbyTimer);

  Serial.print(F("Inverted Volume Buttons: "));
  Serial.println(mySettings.invertVolumeButtons);

  Serial.print(F("Admin Menu locked: "));
  Serial.println(mySettings.adminMenuLocked);

  Serial.print(F("Admin Menu Pin: "));
  Serial.print(mySettings.adminMenuPin[0]);
  Serial.print(mySettings.adminMenuPin[1]);
  Serial.print(mySettings.adminMenuPin[2]);
  Serial.println(mySettings.adminMenuPin[3]);
}

class Modifier {
  public:
    virtual void loop() {}
    virtual bool handlePause() {
      return false;
    }
    virtual bool handleNext() {
      return false;
    }
    virtual bool handlePrevious() {
      return false;
    }
    virtual bool handleNextButton() {
      return false;
    }
    virtual bool handlePreviousButton() {
      return false;
    }
    virtual bool handleVolumeUp() {
      return false;
    }
    virtual bool handleVolumeDown() {
      return false;
    }
    virtual bool handleRFID(nfcTagObject *newCard) {
      return false;
    }
    virtual uint8_t getActive() {
      return 0;
    }
    Modifier() {

    }
};

Modifier *activeModifier = NULL;

class SleepTimer: public Modifier {
  private:
    unsigned long sleepAtMillis = 0;

  public:
    void loop() {
      if (this->sleepAtMillis != 0 && millis() > this->sleepAtMillis) {
        Serial.println(F("=== SleepTimer::loop() -> SLEEP!"));
        mp3.pause();
        setstandbyTimer();
        activeModifier = NULL;
        delete this;
      }
    }

    SleepTimer(uint8_t minutes) {
      Serial.println(F("=== SleepTimer()"));
      Serial.println(minutes);
      this->sleepAtMillis = millis() + minutes * 60000;
      //      if (isPlaying())
      //        mp3.playAdvertisement(302);
      //      delay(500);
    }
    uint8_t getActive() {
      Serial.println(F("== SleepTimer::getActive()"));
      return 1;
    }

    virtual ~SleepTimer() {}
};

class FreezeDance: public Modifier {
  private:
    unsigned long nextStopAtMillis = 0;
    const uint8_t minSecondsBetweenStops = 5;
    const uint8_t maxSecondsBetweenStops = 30;

    void setNextStopAtMillis() {
      uint16_t seconds = random(this->minSecondsBetweenStops, this->maxSecondsBetweenStops + 1);
      Serial.println(F("=== FreezeDance::setNextStopAtMillis()"));
      Serial.println(seconds);
      this->nextStopAtMillis = millis() + seconds * 1000;
    }

  public:
    void loop() {
      if (this->nextStopAtMillis != 0 && millis() > this->nextStopAtMillis) {
        Serial.println(F("== FreezeDance::loop() -> FREEZE!"));
        if (isPlaying()) {
          mp3.playAdvertisement(301);
          delay(500);
        }
        setNextStopAtMillis();
      }
    }
    FreezeDance(void) {
      Serial.println(F("=== FreezeDance()"));
      if (isPlaying()) {
        delay(1000);
        mp3.playAdvertisement(300);
        delay(500);
      }
      setNextStopAtMillis();
    }
    uint8_t getActive() {
      Serial.println(F("== FreezeDance::getActive()"));
      return 2;
    }
};

class Locked: public Modifier {
  public:
    virtual bool handlePause()     {
      Serial.println(F("== Locked::handlePause() -> LOCKED!"));
      return true;
    }
    virtual bool handleNextButton()       {
      Serial.println(F("== Locked::handleNextButton() -> LOCKED!"));
      return true;
    }
    virtual bool handlePreviousButton() {
      Serial.println(F("== Locked::handlePreviousButton() -> LOCKED!"));
      return true;
    }
    virtual bool handleVolumeUp()   {
      Serial.println(F("== Locked::handleVolumeUp() -> LOCKED!"));
      return true;
    }
    virtual bool handleVolumeDown() {
      Serial.println(F("== Locked::handleVolumeDown() -> LOCKED!"));
      return true;
    }
    virtual bool handleRFID(nfcTagObject *newCard) {
      Serial.println(F("== Locked::handleRFID() -> LOCKED!"));
      return true;
    }
    Locked(void) {
      Serial.println(F("=== Locked()"));
      //      if (isPlaying())
      //        mp3.playAdvertisement(303);
    }
    uint8_t getActive() {
      return 3;
    }
};

class ToddlerMode: public Modifier {
  public:
    virtual bool handlePause()     {
      Serial.println(F("== ToddlerMode::handlePause() -> LOCKED!"));
      return true;
    }
    virtual bool handleNextButton()       {
      Serial.println(F("== ToddlerMode::handleNextButton() -> LOCKED!"));
      return true;
    }
    virtual bool handlePreviousButton() {
      Serial.println(F("== ToddlerMode::handlePreviousButton() -> LOCKED!"));
      return true;
    }
    virtual bool handleVolumeUp()   {
      Serial.println(F("== ToddlerMode::handleVolumeUp() -> LOCKED!"));
      return true;
    }
    virtual bool handleVolumeDown() {
      Serial.println(F("== ToddlerMode::handleVolumeDown() -> LOCKED!"));
      return true;
    }
    ToddlerMode(void) {
      Serial.println(F("=== ToddlerMode()"));
      //      if (isPlaying())
      //        mp3.playAdvertisement(304);
    }
    uint8_t getActive() {
      Serial.println(F("== ToddlerMode::getActive()"));
      return 4;
    }
};

class KindergardenMode: public Modifier {
  private:
    nfcTagObject nextCard;
    bool cardQueued = false;

  public:
    virtual bool handleNext() {
      Serial.println(F("== KindergardenMode::handleNext() -> NEXT"));
      //if (this->nextCard.cookie == cardCookie && this->nextCard.nfcFolderSettings.folder != 0 && this->nextCard.nfcFolderSettings.mode != 0) {
      //myFolder = &this->nextCard.nfcFolderSettings;
      if (this->cardQueued == true) {
        this->cardQueued = false;

        myCard = nextCard;
        myFolder = &myCard.nfcFolderSettings;
        Serial.println(myFolder->folder);
        Serial.println(myFolder->mode);
        playFolder();
        return true;
      }
      return false;
    }
    //    virtual bool handlePause()     {
    //      Serial.println(F("== KindergardenMode::handlePause() -> LOCKED!"));
    //      return true;
    //    }
    virtual bool handleNextButton()       {
      Serial.println(F("== KindergardenMode::handleNextButton() -> LOCKED!"));
      return true;
    }
    virtual bool handlePreviousButton() {
      Serial.println(F("== KindergardenMode::handlePreviousButton() -> LOCKED!"));
      return true;
    }
    virtual bool handleRFID(nfcTagObject * newCard) { // lot of work to do!
      Serial.println(F("== KindergardenMode::handleRFID() -> queued!"));
      this->nextCard = *newCard;
      this->cardQueued = true;
      if (!isPlaying()) {
        handleNext();
      }
      return true;
    }
    KindergardenMode() {
      Serial.println(F("=== KindergardenMode()"));
      //      if (isPlaying())
      //        mp3.playAdvertisement(305);
      //      delay(500);
    }
    uint8_t getActive() {
      Serial.println(F("== KindergardenMode::getActive()"));
      return 5;
    }
};

class RepeatSingleModifier: public Modifier {
  public:
    virtual bool handleNext() {
      Serial.println(F("== RepeatSingleModifier::handleNext() -> REPEAT CURRENT TRACK"));
      delay(50);
      if (isPlaying()) return true;
      if (myFolder->mode == 3 || myFolder->mode == 9){
        mp3.playFolderTrack(myFolder->folder, queue[currentTrack - 1]);
      }
      else{
        mp3.playFolderTrack(myFolder->folder, currentTrack);
      }
      _lastTrackFinished = 0;
      return true;
    }
    RepeatSingleModifier() {
      Serial.println(F("=== RepeatSingleModifier()"));
    }
    uint8_t getActive() {
      Serial.println(F("== RepeatSingleModifier::getActive()"));
      return 6;
    }
};

// An modifier can also do somethings in addition to the modified action
// by returning false (not handled) at the end
// This simple FeedbackModifier will tell the volume before changing it and
// give some feedback once a RFID card is detected.
class FeedbackModifier: public Modifier {
  public:
    virtual bool handleVolumeDown() {
      if (volume > mySettings.minVolume) {
        mp3.playAdvertisement(volume - 1);
      }
      else {
        mp3.playAdvertisement(volume);
      }
      delay(500);
      Serial.println(F("== FeedbackModifier::handleVolumeDown()!"));
      return false;
    }
    virtual bool handleVolumeUp() {
      if (volume < mySettings.maxVolume) {
        mp3.playAdvertisement(volume + 1);
      }
      else {
        mp3.playAdvertisement(volume);
      }
      delay(500);
      Serial.println(F("== FeedbackModifier::handleVolumeUp()!"));
      return false;
    }
    virtual bool handleRFID(nfcTagObject *newCard) {
      Serial.println(F("== FeedbackModifier::handleRFID()"));
      return false;
    }
};

// Leider kann das Modul selbst keine Queue abspielen, daher müssen wir selbst die Queue verwalten
static void nextTrack(uint16_t track) {
  Serial.println(track);
  if (activeModifier != NULL)
    if (activeModifier->handleNext() == true)
      return;

  if (track == _lastTrackFinished) {
    return;
  }
  _lastTrackFinished = track;

  if (knownCard == false)
    // Wenn eine neue Karte angelernt wird soll das Ende eines Tracks nicht
    // verarbeitet werden
    return;

  Serial.println(F("=== nextTrack()"));

  if (myFolder->mode == 1 || myFolder->mode == 7) {
    Serial.println(F("Hörspielmodus ist aktiv -> keinen neuen Track spielen"));
    setstandbyTimer();
    //    mp3.sleep(); // Je nach Modul kommt es nicht mehr zurück aus dem Sleep!
  }
  if (myFolder->mode == 2 || myFolder->mode == 8) {
    if (currentTrack != numTracksInFolder) {
      currentTrack = currentTrack + 1;
      mp3.playFolderTrack(myFolder->folder, currentTrack);
      Serial.print(F("Albummodus ist aktiv -> nächster Track: "));
      Serial.print(currentTrack);
    } else
      //      mp3.sleep();   // Je nach Modul kommt es nicht mehr zurück aus dem Sleep!
      setstandbyTimer();
    { }
  }
  if (myFolder->mode == 3 || myFolder->mode == 9) {
    if (currentTrack != numTracksInFolder - firstTrack + 1) {
      Serial.print(F("Party -> weiter in der Queue "));
      currentTrack++;
    } else {
      Serial.println(F("Ende der Queue -> beginne von vorne"));
      currentTrack = 1;
      //// Wenn am Ende der Queue neu gemischt werden soll bitte die Zeilen wieder aktivieren
      //     Serial.println(F("Ende der Queue -> mische neu"));
      //     shuffleQueue();
    }
    Serial.println(queue[currentTrack - 1]);
    mp3.playFolderTrack(myFolder->folder, queue[currentTrack - 1]);
  }

  if (myFolder->mode == 4) {
    Serial.println(F("Einzel Modus aktiv -> Strom sparen"));
    //    mp3.sleep();      // Je nach Modul kommt es nicht mehr zurück aus dem Sleep!
    setstandbyTimer();
  }
  if (myFolder->mode == 5) {
    if (currentTrack != numTracksInFolder) {
      currentTrack = currentTrack + 1;
      Serial.print(F("Hörbuch Modus ist aktiv -> nächster Track und "
                     "Fortschritt speichern"));
      Serial.println(currentTrack);
      mp3.playFolderTrack(myFolder->folder, currentTrack);
      // Fortschritt im EEPROM abspeichern
      EEPROM.update(myFolder->folder, currentTrack);
    } else {
      //      mp3.sleep();  // Je nach Modul kommt es nicht mehr zurück aus dem Sleep!
      // Fortschritt zurück setzen
      EEPROM.update(myFolder->folder, 1);
      setstandbyTimer();
    }
  }
  delay(500);
}

static void previousTrack() {
  Serial.println(F("=== previousTrack()"));
  /*  if (myCard.mode == 1 || myCard.mode == 7) {
      Serial.println(F("Hörspielmodus ist aktiv -> Track von vorne spielen"));
      mp3.playFolderTrack(myCard.folder, currentTrack);
    }*/
  if (myFolder->mode == 2 || myFolder->mode == 8) {
    Serial.println(F("Albummodus ist aktiv -> vorheriger Track"));
    if (currentTrack != firstTrack) {
      currentTrack = currentTrack - 1;
    }
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  if (myFolder->mode == 3 || myFolder->mode == 9) {
    if (currentTrack != 1) {
      Serial.print(F("Party Modus ist aktiv -> zurück in der Qeueue "));
      currentTrack--;
    }
    else
    {
      Serial.print(F("Anfang der Queue -> springe ans Ende "));
      currentTrack = numTracksInFolder;
    }
    Serial.println(queue[currentTrack - 1]);
    mp3.playFolderTrack(myFolder->folder, queue[currentTrack - 1]);
  }
  if (myFolder->mode == 4) {
    Serial.println(F("Einzel Modus aktiv -> Track von vorne spielen"));
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  if (myFolder->mode == 5) {
    Serial.println(F("Hörbuch Modus ist aktiv -> vorheriger Track und "
                     "Fortschritt speichern"));
    if (currentTrack != 1) {
      currentTrack = currentTrack - 1;
    }
    mp3.playFolderTrack(myFolder->folder, currentTrack);
    // Fortschritt im EEPROM abspeichern
    EEPROM.update(myFolder->folder, currentTrack);
  }
  delay(1000);
}

// MFRC522
#define RST_PIN 9                 // Configurable, see typical pin layout above
#define SS_PIN 10                 // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522
MFRC522::MIFARE_Key key;
bool successRead;
byte sector = 1;
byte blockAddr = 4;
byte trailerBlock = 7;
MFRC522::StatusCode status;

#define buttonPause A0
#define buttonUp A1
#define buttonDown A2
#define busyPin 4
#define shutdownPin 7
#define openAnalogPin A7

#ifdef FIVEBUTTONS
#define buttonFourPin A3
#define buttonFivePin A4
#endif

#define LONG_PRESS 1000

Button pauseButton(buttonPause);
Button upButton(buttonUp);
Button downButton(buttonDown);
#ifdef FIVEBUTTONS
Button buttonFour(buttonFourPin);
Button buttonFive(buttonFivePin);
#endif
bool ignorePauseButton = false;
bool ignoreUpButton = false;
bool ignoreDownButton = false;
#ifdef FIVEBUTTONS
bool ignoreButtonFour = false;
bool ignoreButtonFive = false;
#endif

/// Funktionen für den Standby Timer (z.B. über Pololu-Switch oder Mosfet)

void setstandbyTimer() {
  Serial.println(F("=== setstandbyTimer()"));
  if (mySettings.standbyTimer != 0)
    sleepAtMillis = millis() + (mySettings.standbyTimer * 60 * 1000);
  else
    sleepAtMillis = 0;
  Serial.println(sleepAtMillis);
}

void disablestandbyTimer() {
  Serial.println(F("=== disablestandby()"));
  sleepAtMillis = 0;
}

void checkStandbyAtMillis() {
  if (sleepAtMillis != 0 && millis() > sleepAtMillis) {
    Serial.println(F("=== power off!"));
    // enter sleep state
    digitalWrite(shutdownPin, HIGH);
    delay(500);

    // http://discourse.voss.earth/t/intenso-s10000-powerbank-automatische-abschaltung-software-only/805
    // powerdown to 27mA (powerbank switches off after 30-60s)
    mfrc522.PCD_AntennaOff();
    mfrc522.PCD_SoftPowerDown();
    mp3.sleep();

    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
    cli();  // Disable interrupts
    sleep_mode();
  }
}

bool isPlaying() {
  return !digitalRead(busyPin);
}

void waitForTrackToFinish() {
  unsigned long currentTime = millis();
#define TIMEOUT 1000
  do {
    mp3.loop();
  } while (!isPlaying() && millis() < currentTime + TIMEOUT);
  delay(1000);
  do {
    mp3.loop();
  } while (isPlaying());
}

void setup() {

  Serial.begin(115200); // Es gibt ein paar Debug Ausgaben über die serielle Schnittstelle

  // Wert für randomSeed() erzeugen durch das mehrfache Sammeln von rauschenden LSBs eines offenen Analogeingangs
  uint32_t ADC_LSB;
  uint32_t ADCSeed;
  for (uint8_t i = 0; i < 128; i++) {
    ADC_LSB = analogRead(openAnalogPin) & 0x1;
    ADCSeed ^= ADC_LSB << (i % 32);
  }
  randomSeed(ADCSeed); // Zufallsgenerator initialisieren

  // Dieser Hinweis darf nicht entfernt werden
  Serial.println(F("\n _____         _____ _____ _____ _____"));
  Serial.println(F("|_   _|___ ___|  |  |     |   | |     |"));
  Serial.println(F("  | | | . |   |  |  |-   -| | | |  |  |"));
  Serial.println(F("  |_| |___|_|_|_____|_____|_|___|_____|\n"));
  Serial.println(F("TonUINO Version 2.1"));
  Serial.println(F("created by Thorsten Voß and licensed under GNU/GPL."));
  Serial.println(F("Information and contribution at https://tonuino.de.\n"));

  // Busy Pin
  pinMode(busyPin, INPUT);

  // load Settings from EEPROM
  loadSettingsFromFlash();

  // activate standby timer
  setstandbyTimer();

  // DFPlayer Mini initialisieren
  mp3.begin();
  // Zwei Sekunden warten bis der DFPlayer Mini initialisiert ist
  delay(2000);
  volume = mySettings.initVolume;
  mp3.setVolume(volume);
  mp3.setEq(DfMp3_Eq(mySettings.eq - 1));
  // Fix für das Problem mit dem Timeout (ist jetzt in Upstream daher nicht mehr nötig!)
  //mySoftwareSerial.setTimeout(10000);

  // NFC Leser initialisieren
  SPI.begin();        // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522
  mfrc522
  .PCD_DumpVersionToSerial(); // Show details of PCD - MFRC522 Card Reader
  for (byte i = 0; i < 6; i++) {
    key.keyByte[i] = 0xFF;
  }

  pinMode(buttonPause, INPUT_PULLUP);
  pinMode(buttonUp, INPUT_PULLUP);
  pinMode(buttonDown, INPUT_PULLUP);
#ifdef FIVEBUTTONS
  pinMode(buttonFourPin, INPUT_PULLUP);
  pinMode(buttonFivePin, INPUT_PULLUP);
#endif
  pinMode(shutdownPin, OUTPUT);
  digitalWrite(shutdownPin, LOW);


  // RESET --- ALLE DREI KNÖPFE BEIM STARTEN GEDRÜCKT HALTEN -> alle EINSTELLUNGEN werden gelöscht
  if (digitalRead(buttonPause) == LOW && digitalRead(buttonUp) == LOW &&
      digitalRead(buttonDown) == LOW) {
    Serial.println(F("Reset -> EEPROM wird gelöscht"));
    for (unsigned int i = 0; i < EEPROM.length(); i++) {
      EEPROM.update(i, 0);
    }
    loadSettingsFromFlash();
  }


  // Start Shortcut "at Startup" - e.g. Welcome Sound
  playShortCut(3);
}

void readButtons() {
  pauseButton.read();
  upButton.read();
  downButton.read();
#ifdef FIVEBUTTONS
  buttonFour.read();
  buttonFive.read();
#endif
}

void volumeUpButton() {
  if (activeModifier != NULL)
    if (activeModifier->handleVolumeUp() == true)
      return;

  Serial.println(F("=== volumeUp()"));
  if (volume < mySettings.maxVolume) {
    mp3.increaseVolume();
    volume++;
    delay(LONG_PRESS_DELAY);
  }
  Serial.println(volume);
}

void volumeDownButton() {
  if (activeModifier != NULL)
    if (activeModifier->handleVolumeDown() == true)
      return;

  Serial.println(F("=== volumeDown()"));
  if (volume > mySettings.minVolume) {
    mp3.decreaseVolume();
    volume--;
    delay(LONG_PRESS_DELAY);
  }
  Serial.println(volume);
}

void nextButton() {
  if (activeModifier != NULL)
    if (activeModifier->handleNextButton() == true)
      return;

  nextTrack(random(65536));
  delay(1000);
}

void previousButton() {
  if (activeModifier != NULL)
    if (activeModifier->handlePreviousButton() == true)
      return;

  previousTrack();
  delay(1000);
}

void playFolder() {
  Serial.println(F("== playFolder()")) ;
  disablestandbyTimer();
  knownCard = true;
  _lastTrackFinished = 0;
  numTracksInFolder = mp3.getFolderTrackCount(myFolder->folder);
  firstTrack = 1;
  Serial.print(numTracksInFolder);
  Serial.print(F(" Dateien in Ordner "));
  Serial.println(myFolder->folder);

  // Hörspielmodus: eine zufällige Datei aus dem Ordner
  if (myFolder->mode == 1) {
    Serial.println(F("Hörspielmodus -> zufälligen Track wiedergeben"));
    currentTrack = random(1, numTracksInFolder + 1);
    Serial.println(currentTrack);
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  // Album Modus: kompletten Ordner spielen
  if (myFolder->mode == 2) {
    Serial.println(F("Album Modus -> kompletten Ordner wiedergeben"));
    currentTrack = 1;
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  // Party Modus: Ordner in zufälliger Reihenfolge
  if (myFolder->mode == 3) {
    Serial.println(
      F("Party Modus -> Ordner in zufälliger Reihenfolge wiedergeben"));
    shuffleQueue();
    currentTrack = 1;
    mp3.playFolderTrack(myFolder->folder, queue[currentTrack - 1]);
  }
  // Einzel Modus: eine Datei aus dem Ordner abspielen
  if (myFolder->mode == 4) {
    Serial.println(
      F("Einzel Modus -> eine Datei aus dem Odrdner abspielen"));
    currentTrack = myFolder->special;
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  // Hörbuch Modus: kompletten Ordner spielen und Fortschritt merken
  if (myFolder->mode == 5) {
    Serial.println(F("Hörbuch Modus -> kompletten Ordner spielen und "
                     "Fortschritt merken"));
    currentTrack = EEPROM.read(myFolder->folder);
    if (currentTrack == 0 || currentTrack > numTracksInFolder) {
      currentTrack = 1;
    }
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }
  // Spezialmodus Von-Bin: Hörspiel: eine zufällige Datei aus dem Ordner
  if (myFolder->mode == 7) {
    Serial.println(F("Spezialmodus Von-Bin: Hörspiel -> zufälligen Track wiedergeben"));
    Serial.print(myFolder->special);
    Serial.print(F(" bis "));
    Serial.println(myFolder->special2);
    numTracksInFolder = myFolder->special2;
    currentTrack = random(myFolder->special, numTracksInFolder + 1);
    Serial.println(currentTrack);
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }

  // Spezialmodus Von-Bis: Album: alle Dateien zwischen Start und Ende spielen
  if (myFolder->mode == 8) {
    Serial.println(F("Spezialmodus Von-Bis: Album: alle Dateien zwischen Start- und Enddatei spielen"));
    Serial.print(myFolder->special);
    Serial.print(F(" bis "));
    Serial.println(myFolder->special2);
    numTracksInFolder = myFolder->special2;
    currentTrack = myFolder->special;
    mp3.playFolderTrack(myFolder->folder, currentTrack);
  }

  // Spezialmodus Von-Bis: Party Ordner in zufälliger Reihenfolge
  if (myFolder->mode == 9) {
    Serial.println(
      F("Spezialmodus Von-Bis: Party -> Ordner in zufälliger Reihenfolge wiedergeben"));
    firstTrack = myFolder->special;
    numTracksInFolder = myFolder->special2;
    shuffleQueue();
    currentTrack = 1;
    mp3.playFolderTrack(myFolder->folder, queue[currentTrack - 1]);
  }
}

void playShortCut(uint8_t shortCut) {
  Serial.println(F("=== playShortCut()"));
  Serial.println(shortCut);
  if (mySettings.shortCuts[shortCut].folder != 0) {
    myFolder = &mySettings.shortCuts[shortCut];
    playFolder();
    disablestandbyTimer();
    delay(1000);
  }
  else
    Serial.println(F("Shortcut not configured!"));
}

void loop() {
  int _rfid_error_counter = 0;
  
  do {

#ifdef PAUSEONCARDREMOVAL
    // auf Lesefehler des RFID Moduls prüfen
    _rfid_error_counter += 1;
    if(_rfid_error_counter > 2){
      card_present = false;
    }

    // Ist eine Karte aufgelegt?
    byte bufferATQA[2];
    byte bufferSize = sizeof(bufferATQA);
    MFRC522::StatusCode result = mfrc522.PICC_RequestA(bufferATQA, &bufferSize);
  
    if(result == mfrc522.STATUS_OK){
      _rfid_error_counter = 0;
      card_present = true;
    }
#endif

    checkStandbyAtMillis();
    mp3.loop();

    // Modifier : WIP!
    if (activeModifier != NULL) {
      activeModifier->loop();
    }

    // Buttons werden nun über JS_Button gehandelt, dadurch kann jede Taste
    // doppelt belegt werden
    readButtons();

    // admin menu
    if ((pauseButton.pressedFor(LONG_PRESS) || upButton.pressedFor(LONG_PRESS) || downButton.pressedFor(LONG_PRESS)) && pauseButton.isPressed() && upButton.isPressed() && downButton.isPressed()) {
      mp3.pause();
      do {
        readButtons();
      } while (pauseButton.isPressed() || upButton.isPressed() || downButton.isPressed());
      readButtons();
      adminMenu();
      break;
    }

    if (pauseButton.wasReleased()) {
      if (activeModifier != NULL)
        if (activeModifier->handlePause() == true)
          return;
      if (ignorePauseButton == false) {
        if (isPlaying()) {
          mp3.pause();
          setstandbyTimer();
        }
        else if (knownCard) {
          mp3.start();
          disablestandbyTimer();
        }
      }
      ignorePauseButton = false;
    } else if (pauseButton.pressedFor(LONG_PRESS) &&
               ignorePauseButton == false) {
      if (activeModifier != NULL)
        if (activeModifier->handlePause() == true)
          return;
      if (isPlaying()) {
        uint8_t advertTrack;
        if (myFolder->mode == 3 || myFolder->mode == 9) {
          advertTrack = (queue[currentTrack - 1]);
        }
        else {
          advertTrack = currentTrack;
        }
        // Spezialmodus Von-Bis für Album und Party gibt die Dateinummer relativ zur Startposition wieder
        if (myFolder->mode == 8 || myFolder->mode == 9) {
          advertTrack = advertTrack - myFolder->special + 1;
        }
        mp3.playAdvertisement(advertTrack);
      }
      else {
        playShortCut(0);
      }
      ignorePauseButton = true;
    }

    if (upButton.pressedFor(LONG_PRESS)) {
#ifndef FIVEBUTTONS
      if (isPlaying()) {
        if (!mySettings.invertVolumeButtons) {
          volumeUpButton();
        }
        else {
          nextButton();
        }
      }
      else {
        playShortCut(1);
      }
      ignoreUpButton = true;
#endif
    } else if (upButton.wasReleased()) {
      if (!ignoreUpButton) {
        if (!mySettings.invertVolumeButtons) {
          nextButton();
        }
        else {
          volumeUpButton();
        }
      }
      ignoreUpButton = false;
    }

    if (downButton.pressedFor(LONG_PRESS)) {
#ifndef FIVEBUTTONS
      if (isPlaying()) {
        if (!mySettings.invertVolumeButtons) {
          volumeDownButton();
        }
        else {
          previousButton();
        }
      }
      else {
        playShortCut(2);
      }
      ignoreDownButton = true;
#endif
    } else if (downButton.wasReleased()) {
      if (!ignoreDownButton) {
        if (!mySettings.invertVolumeButtons) {
          previousButton();
        }
        else {
          volumeDownButton();
        }
      }
      ignoreDownButton = false;
    }
#ifdef FIVEBUTTONS
    if (buttonFour.wasReleased()) {
      if (isPlaying()) {
        if (!mySettings.invertVolumeButtons) {
          volumeUpButton();
        }
        else {
          nextButton();
        }
      }
      else {
        playShortCut(1);
      }
    }
    if (buttonFive.wasReleased()) {
      if (isPlaying()) {
        if (!mySettings.invertVolumeButtons) {
          volumeDownButton();
        }
        else {
          previousButton();
        }
      }
      else {
        playShortCut(2);
      }
    }
#endif
    // Ende der Buttons

#ifndef PAUSEONCARDREMOVAL
  } while (!mfrc522.PICC_IsNewCardPresent());
  
  // RFID Karte wurde aufgelegt
  if (!mfrc522.PICC_ReadCardSerial())
    return;

  if (readCard(&myCard) == true) {
    if (myCard.cookie == cardCookie && myCard.nfcFolderSettings.folder != 0 && myCard.nfcFolderSettings.mode != 0) {
      playFolder();
    }
  
    // Neue Karte konfigurieren
    else if (myCard.cookie != cardCookie) {
      knownCard = false;
      mp3.playMp3FolderTrack(300);
      waitForTrackToFinish();
      setupCard();
    }
   }
   mfrc522.PICC_HaltA();
   mfrc522.PCD_StopCrypto1();

#endif
#ifdef PAUSEONCARDREMOVAL
  // solange keine Karte aufgelegt oder heruntergenommen wird
  } while ( !(!card_present && card_present_prev) && !(card_present && !card_present_prev) );
  
  // RFID Karte wurde entfernt
  if (!card_present && card_present_prev){
    card_present_prev = card_present;
      // pausiere
      if (activeModifier != NULL)
        if (activeModifier->handlePause() == true)
          return;
      if (ignorePauseButton == false)
        if (isPlaying()) {
          mp3.pause();
          setstandbyTimer();
        }
        else if (knownCard) {
          mp3.start();
          disablestandbyTimer();
        }
      ignorePauseButton = false;
      return;
  }

  // RFID Karte wurde aufgelegt
  if (card_present && !card_present_prev){
    card_present_prev = card_present;

    if (!mfrc522.PICC_ReadCardSerial())
      return;

    if (readCard(&myCard) == true) {
      if (myCard.cookie == cardCookie && myCard.nfcFolderSettings.folder != 0 && myCard.nfcFolderSettings.mode != 0) {
        playFolder();
      }
  
      // Neue Karte konfigurieren
      else if (myCard.cookie != cardCookie) {
        knownCard = false;
        mp3.playMp3FolderTrack(300);
        waitForTrackToFinish();
        setupCard();
      }
    }
    mfrc522.PCD_StopCrypto1();
  }
#endif
}

void adminMenu(bool fromCard) {
  disablestandbyTimer();
  mp3.pause();
  Serial.println(F("=== adminMenu()"));
  knownCard = false;
  if (fromCard == false) {
    // Admin menu has been locked - it still can be trigged via admin card
    if (mySettings.adminMenuLocked == 1) {
      return;
    }
    // Pin check
    else if (mySettings.adminMenuLocked == 2) {
      uint8_t pin[4];
      mp3.playMp3FolderTrack(991);
      if (askCode(pin) == true) {
        if (checkTwo(pin, mySettings.adminMenuPin) == false) {
          return;
        }
      } else {
        return;
      }
    }
    // Match check
    else if (mySettings.adminMenuLocked == 3) {
      uint8_t a = random(10, 20);
      uint8_t b = random(1, 10);
      uint8_t c;
      mp3.playMp3FolderTrack(992);
      waitForTrackToFinish();
      mp3.playMp3FolderTrack(a);

      if (random(1, 3) == 2) {
        // a + b
        c = a + b;
        waitForTrackToFinish();
        mp3.playMp3FolderTrack(993);
      } else {
        // a - b
        b = random(1, a);
        c = a - b;
        waitForTrackToFinish();
        mp3.playMp3FolderTrack(994);
      }
      waitForTrackToFinish();
      mp3.playMp3FolderTrack(b);
      Serial.println(c);
      uint8_t temp = voiceMenu(255, 0, 0, false);
      if (temp != c) {
        return;
      }
    }
  }
  int subMenu = voiceMenu(12, 900, 900, false, false, 0, true);
  if (subMenu == 0)
    return;
  if (subMenu == 1) {
    resetCard();
    mfrc522.PICC_HaltA();
    mfrc522.PCD_StopCrypto1();
  }
  else if (subMenu == 2) {
    // Maximum Volume
    mySettings.maxVolume = voiceMenu(30 - mySettings.minVolume, 930, mySettings.minVolume, false, false, mySettings.maxVolume - mySettings.minVolume) + mySettings.minVolume;
  }
  else if (subMenu == 3) {
    // Minimum Volume
    mySettings.minVolume = voiceMenu(mySettings.maxVolume - 1, 931, 0, false, false, mySettings.minVolume);
  }
  else if (subMenu == 4) {
    // Initial Volume
    mySettings.initVolume = voiceMenu(mySettings.maxVolume - mySettings.minVolume + 1, 932, mySettings.minVolume - 1, false, false, mySettings.initVolume - mySettings.minVolume + 1) + mySettings.minVolume - 1;
  }
  else if (subMenu == 5) {
    // EQ
    mySettings.eq = voiceMenu(6, 920, 920, false, false, mySettings.eq);
    mp3.setEq(DfMp3_Eq(mySettings.eq - 1));
  }
  else if (subMenu == 6) {
    // create modifier card
    nfcTagObject tempCard;
    tempCard.cookie = cardCookie;
    tempCard.version = 1;
    tempCard.nfcFolderSettings.folder = 0;
    tempCard.nfcFolderSettings.special = 0;
    tempCard.nfcFolderSettings.special2 = 0;
    tempCard.nfcFolderSettings.mode = voiceMenu(6, 970, 970, false, false, 0, true);

    if (tempCard.nfcFolderSettings.mode != 0) {
      if (tempCard.nfcFolderSettings.mode == 1) {
        switch (voiceMenu(4, 960, 960)) {
          case 1: tempCard.nfcFolderSettings.special = 5; break;
          case 2: tempCard.nfcFolderSettings.special = 15; break;
          case 3: tempCard.nfcFolderSettings.special = 30; break;
          case 4: tempCard.nfcFolderSettings.special = 60; break;
        }
      }
      mp3.playMp3FolderTrack(800);
      do {
        readButtons();
        if (upButton.wasReleased() || downButton.wasReleased()) {
          Serial.println(F("Abgebrochen!"));
          mp3.playMp3FolderTrack(802);
          return;
        }
      } while (!mfrc522.PICC_IsNewCardPresent());

      // RFID Karte wurde aufgelegt
      if (mfrc522.PICC_ReadCardSerial()) {
        Serial.println(F("schreibe Karte..."));
        writeCard(tempCard);
        delay(100);
        mfrc522.PICC_HaltA();
        mfrc522.PCD_StopCrypto1();
        waitForTrackToFinish();
      }
    }
  }
  else if (subMenu == 7) {
    uint8_t shortcut = voiceMenu(4, 940, 940);
    setupFolder(&mySettings.shortCuts[shortcut - 1]);
    mp3.playMp3FolderTrack(400);
  }
  else if (subMenu == 8) {
    switch (voiceMenu(5, 960, 960)) {
      case 1: mySettings.standbyTimer = 5; break;
      case 2: mySettings.standbyTimer = 15; break;
      case 3: mySettings.standbyTimer = 30; break;
      case 4: mySettings.standbyTimer = 60; break;
      case 5: mySettings.standbyTimer = 0; break;
    }
  }
  else if (subMenu == 9) {
    // Create Cards for Folder
    // Ordner abfragen
    nfcTagObject tempCard;
    tempCard.cookie = cardCookie;
    tempCard.version = 1;
    tempCard.nfcFolderSettings.mode = 4;
    tempCard.nfcFolderSettings.folder = voiceMenu(99, 301, 0, true);
    uint8_t special = voiceMenu(mp3.getFolderTrackCount(tempCard.nfcFolderSettings.folder), 321, 0,
                                true, tempCard.nfcFolderSettings.folder);
    uint8_t special2 = voiceMenu(mp3.getFolderTrackCount(tempCard.nfcFolderSettings.folder), 322, 0,
                                 true, tempCard.nfcFolderSettings.folder, special);

    mp3.playMp3FolderTrack(936);
    waitForTrackToFinish();
    for (uint8_t x = special; x <= special2; x++) {
      mp3.playMp3FolderTrack(x);
      tempCard.nfcFolderSettings.special = x;
      Serial.print(x);
      Serial.println(F(" Karte auflegen"));
      do {
        readButtons();
        if (upButton.wasReleased() || downButton.wasReleased()) {
          Serial.println(F("Abgebrochen!"));
          mp3.playMp3FolderTrack(802);
          return;
        }
      } while (!mfrc522.PICC_IsNewCardPresent());

      // RFID Karte wurde aufgelegt
      if (mfrc522.PICC_ReadCardSerial()) {
        Serial.println(F("schreibe Karte..."));
        writeCard(tempCard);
        delay(100);
        mfrc522.PICC_HaltA();
        mfrc522.PCD_StopCrypto1();
        waitForTrackToFinish();
      }
    }
  }
  else if (subMenu == 10) {
    // Invert Functions for Up/Down Buttons
    int temp = voiceMenu(2, 933, 933, false);
    if (temp == 2) {
      mySettings.invertVolumeButtons = true;
    }
    else {
      mySettings.invertVolumeButtons = false;
    }
  }
  else if (subMenu == 11) {
    Serial.println(F("Reset -> EEPROM wird gelöscht"));
    for (unsigned int i = 0; i < EEPROM.length(); i++) {
      EEPROM.update(i, 0);
    }
    resetSettings();
    mp3.playMp3FolderTrack(999);
  }
  // lock admin menu
  else if (subMenu == 12) {
    int temp = voiceMenu(4, 980, 980, false);
    if (temp == 1) {
      mySettings.adminMenuLocked = 0;
    }
    else if (temp == 2) {
      mySettings.adminMenuLocked = 1;
    }
    else if (temp == 3) {
      uint8_t pin[4];
      mp3.playMp3FolderTrack(991);
      if (askCode(pin)) {
        memcpy(mySettings.adminMenuPin, pin, 4);
        mySettings.adminMenuLocked = 2;
      }
    }
    else if (temp == 4) {
      mySettings.adminMenuLocked = 3;
    }

  }
  writeSettingsToFlash();
  setstandbyTimer();
}

bool askCode(uint8_t *code) {
  uint8_t x = 0;
  while (x < 4) {
    readButtons();
    if (pauseButton.pressedFor(LONG_PRESS))
      break;
    if (pauseButton.wasReleased())
      code[x++] = 1;
    if (upButton.wasReleased())
      code[x++] = 2;
    if (downButton.wasReleased())
      code[x++] = 3;
  }
  return true;
}

uint8_t voiceMenu(int numberOfOptions, int startMessage, int messageOffset,
                  bool preview, int previewFromFolder, int defaultValue, bool exitWithLongPress) {
  uint8_t returnValue = defaultValue;
  if (startMessage != 0)
    mp3.playMp3FolderTrack(startMessage);
  Serial.print(F("=== voiceMenu() ("));
  Serial.print(numberOfOptions);
  Serial.println(F(" Options)"));
  do {
    if (Serial.available() > 0) {
      int optionSerial = Serial.parseInt();
      if (optionSerial != 0 && optionSerial <= numberOfOptions)
        return optionSerial;
    }
    readButtons();
    mp3.loop();
    if (pauseButton.pressedFor(LONG_PRESS)) {
      mp3.playMp3FolderTrack(802);
      ignorePauseButton = true;
      checkStandbyAtMillis();
      return defaultValue;
    }
    if (pauseButton.wasReleased()) {
      if (returnValue != 0) {
        Serial.print(F("=== "));
        Serial.print(returnValue);
        Serial.println(F(" ==="));
        return returnValue;
      }
      delay(1000);
    }

    if (upButton.pressedFor(LONG_PRESS)) {
      returnValue = min(returnValue + 10, numberOfOptions);
      Serial.println(returnValue);
      //mp3.pause();
      mp3.playMp3FolderTrack(messageOffset + returnValue);
      waitForTrackToFinish();
      /*if (preview) {
        if (previewFromFolder == 0)
          mp3.playFolderTrack(returnValue, 1);
        else
          mp3.playFolderTrack(previewFromFolder, returnValue);
        }*/
      ignoreUpButton = true;
    } else if (upButton.wasReleased()) {
      if (!ignoreUpButton) {
        returnValue = min(returnValue + 1, numberOfOptions);
        Serial.println(returnValue);
        //mp3.pause();
        mp3.playMp3FolderTrack(messageOffset + returnValue);
        if (preview) {
          waitForTrackToFinish();
          if (previewFromFolder == 0) {
            mp3.playFolderTrack(returnValue, 1);
          } else {
            mp3.playFolderTrack(previewFromFolder, returnValue);
          }
          delay(1000);
        }
      } else {
        ignoreUpButton = false;
      }
    }

    if (downButton.pressedFor(LONG_PRESS)) {
      returnValue = max(returnValue - 10, 1);
      Serial.println(returnValue);
      //mp3.pause();
      mp3.playMp3FolderTrack(messageOffset + returnValue);
      waitForTrackToFinish();
      /*if (preview) {
        if (previewFromFolder == 0)
          mp3.playFolderTrack(returnValue, 1);
        else
          mp3.playFolderTrack(previewFromFolder, returnValue);
        }*/
      ignoreDownButton = true;
    } else if (downButton.wasReleased()) {
      if (!ignoreDownButton) {
        returnValue = max(returnValue - 1, 1);
        Serial.println(returnValue);
        //mp3.pause();
        mp3.playMp3FolderTrack(messageOffset + returnValue);
        if (preview) {
          waitForTrackToFinish();
          if (previewFromFolder == 0) {
            mp3.playFolderTrack(returnValue, 1);
          }
          else {
            mp3.playFolderTrack(previewFromFolder, returnValue);
          }
          delay(1000);
        }
      } else {
        ignoreDownButton = false;
      }
    }
  } while (true);
}

void resetCard() {
  mp3.playMp3FolderTrack(800);
  do {
    pauseButton.read();
    upButton.read();
    downButton.read();

    if (upButton.wasReleased() || downButton.wasReleased()) {
      Serial.print(F("Abgebrochen!"));
      mp3.playMp3FolderTrack(802);
      return;
    }
  } while (!mfrc522.PICC_IsNewCardPresent());

  if (!mfrc522.PICC_ReadCardSerial())
    return;

  Serial.print(F("Karte wird neu konfiguriert!"));
  setupCard();
}

bool setupFolder(folderSettings * theFolder) {
  // Ordner abfragen
  theFolder->folder = voiceMenu(99, 301, 0, true, 0, 0, true);
  if (theFolder->folder == 0) return false;

  // Wiedergabemodus abfragen
  theFolder->mode = voiceMenu(9, 310, 310, false, 0, 0, true);
  if (theFolder->mode == 0) return false;

  //  // Hörbuchmodus -> Fortschritt im EEPROM auf 1 setzen
  //  EEPROM.update(theFolder->folder, 1);

  // Einzelmodus -> Datei abfragen
  if (theFolder->mode == 4)
    theFolder->special = voiceMenu(mp3.getFolderTrackCount(theFolder->folder), 320, 0,
                                   true, theFolder->folder);
  // Admin Funktionen
  if (theFolder->mode == 6) {
    //theFolder->special = voiceMenu(3, 320, 320);
    theFolder->folder = 0;
    theFolder->mode = 255;
  }
  // Spezialmodus Von-Bis
  if (theFolder->mode == 7 || theFolder->mode == 8 || theFolder->mode == 9) {
    theFolder->special = voiceMenu(mp3.getFolderTrackCount(theFolder->folder), 321, 0,
                                   true, theFolder->folder);
    theFolder->special2 = voiceMenu(mp3.getFolderTrackCount(theFolder->folder), 322, 0,
                                    true, theFolder->folder, theFolder->special);
  }
  return true;
}

void setupCard() {
  mp3.pause();
  Serial.println(F("=== setupCard()"));
  nfcTagObject newCard;
  if (setupFolder(&newCard.nfcFolderSettings) == true)
  {
    // Karte ist konfiguriert -> speichern
    mp3.pause();
    do {
    } while (isPlaying());
    writeCard(newCard);
  }
  delay(1000);
}
bool readCard(nfcTagObject * nfcTag) {
  nfcTagObject tempCard;
  // Show some details of the PICC (that is: the tag/card)
  Serial.print(F("Card UID:"));
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  Serial.println();
  Serial.print(F("PICC type: "));
  MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
  Serial.println(mfrc522.PICC_GetTypeName(piccType));

  byte buffer[18];
  byte size = sizeof(buffer);

  // Authenticate using key A
  if ((piccType == MFRC522::PICC_TYPE_MIFARE_MINI ) ||
      (piccType == MFRC522::PICC_TYPE_MIFARE_1K ) ||
      (piccType == MFRC522::PICC_TYPE_MIFARE_4K ) )
  {
    Serial.println(F("Authenticating Classic using key A..."));
    status = mfrc522.PCD_Authenticate(
               MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
  }
  else if (piccType == MFRC522::PICC_TYPE_MIFARE_UL )
  {
    byte pACK[] = {0, 0}; //16 bit PassWord ACK returned by the tempCard

    // Authenticate using key A
    Serial.println(F("Authenticating MIFARE UL..."));
    status = mfrc522.PCD_NTAG216_AUTH(key.keyByte, pACK);
  }

  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("PCD_Authenticate() failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    return false;
  }

  // Show the whole sector as it currently is
  // Serial.println(F("Current data in sector:"));
  // mfrc522.PICC_DumpMifareClassicSectorToSerial(&(mfrc522.uid), &key, sector);
  // Serial.println();

  // Read data from the block
  if ((piccType == MFRC522::PICC_TYPE_MIFARE_MINI ) ||
      (piccType == MFRC522::PICC_TYPE_MIFARE_1K ) ||
      (piccType == MFRC522::PICC_TYPE_MIFARE_4K ) )
  {
    Serial.print(F("Reading data from block "));
    Serial.print(blockAddr);
    Serial.println(F(" ..."));
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Read(blockAddr, buffer, &size);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Read() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return false;
    }
  }
  else if (piccType == MFRC522::PICC_TYPE_MIFARE_UL )
  {
    byte buffer2[18];
    byte size2 = sizeof(buffer2);

    status = (MFRC522::StatusCode)mfrc522.MIFARE_Read(8, buffer2, &size2);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Read_1() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return false;
    }
    memcpy(buffer, buffer2, 4);

    status = (MFRC522::StatusCode)mfrc522.MIFARE_Read(9, buffer2, &size2);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Read_2() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return false;
    }
    memcpy(buffer + 4, buffer2, 4);

    status = (MFRC522::StatusCode)mfrc522.MIFARE_Read(10, buffer2, &size2);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Read_3() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return false;
    }
    memcpy(buffer + 8, buffer2, 4);

    status = (MFRC522::StatusCode)mfrc522.MIFARE_Read(11, buffer2, &size2);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Read_4() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return false;
    }
    memcpy(buffer + 12, buffer2, 4);
  }

  Serial.print(F("Data on Card "));
  Serial.println(F(":"));
  dump_byte_array(buffer, 16);
  Serial.println();
  Serial.println();

  uint32_t tempCookie;
  tempCookie = (uint32_t)buffer[0] << 24;
  tempCookie += (uint32_t)buffer[1] << 16;
  tempCookie += (uint32_t)buffer[2] << 8;
  tempCookie += (uint32_t)buffer[3];

  tempCard.cookie = tempCookie;
  tempCard.version = buffer[4];
  tempCard.nfcFolderSettings.folder = buffer[5];
  tempCard.nfcFolderSettings.mode = buffer[6];
  tempCard.nfcFolderSettings.special = buffer[7];
  tempCard.nfcFolderSettings.special2 = buffer[8];

  if (tempCard.cookie == cardCookie) {

    if (activeModifier != NULL && tempCard.nfcFolderSettings.folder != 0) {
      if (activeModifier->handleRFID(&tempCard) == true) {
        return false;
      }
    }

    if (tempCard.nfcFolderSettings.folder == 0) {
      if (activeModifier != NULL) {
        if (activeModifier->getActive() == tempCard.nfcFolderSettings.mode) {
          activeModifier = NULL;
          Serial.println(F("modifier removed"));
          if (isPlaying()) {
            mp3.playAdvertisement(261);
          }
          else {
            mp3.start();
            delay(100);
            mp3.playAdvertisement(261);
            delay(100);
            mp3.pause();
          }
          delay(2000);
          return false;
        }
      }
      if (tempCard.nfcFolderSettings.mode != 0 && tempCard.nfcFolderSettings.mode != 255) {
        if (isPlaying()) {
          mp3.playAdvertisement(260);
        }
        else {
          mp3.start();
          delay(100);
          mp3.playAdvertisement(260);
          delay(100);
          mp3.pause();
        }
      }
      switch (tempCard.nfcFolderSettings.mode ) {
        case 0:
        case 255:
          mfrc522.PICC_HaltA(); mfrc522.PCD_StopCrypto1(); adminMenu(true);  break;
        case 1: activeModifier = new SleepTimer(tempCard.nfcFolderSettings.special); break;
        case 2: activeModifier = new FreezeDance(); break;
        case 3: activeModifier = new Locked(); break;
        case 4: activeModifier = new ToddlerMode(); break;
        case 5: activeModifier = new KindergardenMode(); break;
        case 6: activeModifier = new RepeatSingleModifier(); break;

      }
      delay(2000);
      return false;
    }
    else {
      memcpy(nfcTag, &tempCard, sizeof(nfcTagObject));
      Serial.println( nfcTag->nfcFolderSettings.folder);
      myFolder = &nfcTag->nfcFolderSettings;
      Serial.println( myFolder->folder);
    }
    return true;
  }
  else {
    memcpy(nfcTag, &tempCard, sizeof(nfcTagObject));
    return true;
  }
}


void writeCard(nfcTagObject nfcTag) {
  MFRC522::PICC_Type mifareType;
  byte buffer[16] = {0x13, 0x37, 0xb3, 0x47, // 0x1337 0xb347 magic cookie to
                     // identify our nfc tags
                     0x02,                   // version 1
                     nfcTag.nfcFolderSettings.folder,          // the folder picked by the user
                     nfcTag.nfcFolderSettings.mode,    // the playback mode picked by the user
                     nfcTag.nfcFolderSettings.special, // track or function for admin cards
                     nfcTag.nfcFolderSettings.special2,
                     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
                    };

  mifareType = mfrc522.PICC_GetType(mfrc522.uid.sak);

  // Authenticate using key B
  //authentificate with the card and set card specific parameters
  if ((mifareType == MFRC522::PICC_TYPE_MIFARE_MINI ) ||
      (mifareType == MFRC522::PICC_TYPE_MIFARE_1K ) ||
      (mifareType == MFRC522::PICC_TYPE_MIFARE_4K ) )
  {
    Serial.println(F("Authenticating again using key A..."));
    status = mfrc522.PCD_Authenticate(
               MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
  }
  else if (mifareType == MFRC522::PICC_TYPE_MIFARE_UL )
  {
    byte pACK[] = {0, 0}; //16 bit PassWord ACK returned by the NFCtag

    // Authenticate using key A
    Serial.println(F("Authenticating UL..."));
    status = mfrc522.PCD_NTAG216_AUTH(key.keyByte, pACK);
  }

  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("PCD_Authenticate() failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    mp3.playMp3FolderTrack(401);
    return;
  }

  // Write data to the block
  Serial.print(F("Writing data into block "));
  Serial.print(blockAddr);
  Serial.println(F(" ..."));
  dump_byte_array(buffer, 16);
  Serial.println();

  if ((mifareType == MFRC522::PICC_TYPE_MIFARE_MINI ) ||
      (mifareType == MFRC522::PICC_TYPE_MIFARE_1K ) ||
      (mifareType == MFRC522::PICC_TYPE_MIFARE_4K ) )
  {
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Write(blockAddr, buffer, 16);
  }
  else if (mifareType == MFRC522::PICC_TYPE_MIFARE_UL )
  {
    byte buffer2[16];
    byte size2 = sizeof(buffer2);

    memset(buffer2, 0, size2);
    memcpy(buffer2, buffer, 4);
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Write(8, buffer2, 16);

    memset(buffer2, 0, size2);
    memcpy(buffer2, buffer + 4, 4);
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Write(9, buffer2, 16);

    memset(buffer2, 0, size2);
    memcpy(buffer2, buffer + 8, 4);
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Write(10, buffer2, 16);

    memset(buffer2, 0, size2);
    memcpy(buffer2, buffer + 12, 4);
    status = (MFRC522::StatusCode)mfrc522.MIFARE_Write(11, buffer2, 16);
  }

  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("MIFARE_Write() failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    mp3.playMp3FolderTrack(401);
  }
  else
    mp3.playMp3FolderTrack(400);
  Serial.println();
  delay(2000);
}



/**
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte * buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}

///////////////////////////////////////// Check Bytes   ///////////////////////////////////
bool checkTwo ( uint8_t a[], uint8_t b[] ) {
  for ( uint8_t k = 0; k < 4; k++ ) {   // Loop 4 times
    if ( a[k] != b[k] ) {     // IF a != b then false, because: one fails, all fail
      return false;
    }
  }
  return true;
}