functions to the Alt.ino program

functions.ino

  int readBlock(int blockNumber, byte arrayAddress[]) {
  int largestModulo4Number=blockNumber/4*4;
  int trailerBlock=largestModulo4Number+3;//determine trailer block for the sector

  /*****************************************authentication of the desired block for access***********************************************************/
  byte status = scanner.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(scanner.uid));
  if (status != MFRC522::STATUS_OK) {
         //Serial.print("PCD_Authenticate() failed (read): ");
         //Serial.println(scanner.GetStatusCodeName(status));
         skrivFeilmld();
         return 3; //return "3" as error message
  }
  
  
  /*****************************************reading a block***********************************************************/        
  byte buffersize = 18;//we need to define a variable with the read buffer size, since the MIFARE_Read method below needs a pointer to the variable that contains the size... 
  status = scanner.MIFARE_Read(blockNumber, arrayAddress, &buffersize);//&buffersize is a pointer to the buffersize variable; MIFARE_Read requires a pointer instead of just a number
  if (status != MFRC522::STATUS_OK) {
          //Serial.print("MIFARE_read() failed: ");
          //Serial.println(scanner.GetStatusCodeName(status));
          skrivFeilmld();
         return 4;   //return "4" as error message

  }
  return 1;
}

void registrerElev(){
  for (int j=0 ; j<16 ; j++){             //print the block contents 
    name += char(readbackblock[j]);       //transmits the ASCII numbers as human readable characters to serial monitor
  }   
  //Writing to Excel and LCD     
  Serial.print("DATA,TIME,");      //writes the date in the first column A and the time in column B
  Serial.print(name);
  Serial.println();                     //Goes to next row on the second run 
  clearLCD();
  lcd.setCursor(0, 0);
  lcd.print(name);
  lcd.setCursor(0, 1);
  lcd.print("er registrert.");
  pixels.setBrightness(200);
  for(int i=0;i<NUMPIXELS;i++){
     pixels.setPixelColor(i, pixels.Color(0,255,0)); // Moderately bright green color.
     pixels.show();
  }
  delay(2000);
  pixels.setBrightness(0);
  pixels.show();
  scanner.PCD_StopCrypto1();
  clearLCD();
  name = ""; 
}

void clearLCD(){
  lcd.setCursor(0, 0);
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.clear();
  //digitalWrite(greenLeds, LOW);
  //digitalWrite(redLeds, LOW);
}

void skrivFeilmld(){
  clearLCD();
  lcd.setCursor(0, 0);
  lcd.print("En feil oppstod");
  lcd.setCursor(0, 1);
  lcd.print("ikke registrert.");
  pixels.setBrightness(200);
  for(int i=0;i<NUMPIXELS;i++){
     pixels.setPixelColor(i, pixels.Color(255,0,0)); // Moderately bright red color.
     pixels.show();
  }
  delay(2000);
  pixels.setBrightness(0);
  pixels.show();
  feilRegistrering = true;
}