diff --git a/Dump.py b/Dump.py
index 3b528e4..46f7db9 100644
--- a/Dump.py
+++ b/Dump.py
@@ -21,7 +21,6 @@
 #    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import RPi.GPIO as GPIO
 import MFRC522
 import signal
 
@@ -30,9 +29,8 @@
 # Capture SIGINT for cleanup when the script is aborted
 def end_read(signal,frame):
     global continue_reading
-    print "Ctrl+C captured, ending read."
+    print("Ctrl+C captured, ending read.")
     continue_reading = False
-    GPIO.cleanup()
 
 # Hook the SIGINT
 signal.signal(signal.SIGINT, end_read)
@@ -42,14 +40,14 @@ def end_read(signal,frame):
 
 # This loop keeps checking for chips. If one is near it will get the UID and authenticate
 while continue_reading:
-    
-    # Scan for cards    
+
+    # Scan for cards
     (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
 
     # If a card is found
     if status == MIFAREReader.MI_OK:
-        print "Card detected"
-    
+        print("Card detected")
+
     # Get the UID of the card
     (status,uid) = MIFAREReader.MFRC522_Anticoll()
 
@@ -57,11 +55,11 @@ def end_read(signal,frame):
     if status == MIFAREReader.MI_OK:
 
         # Print UID
-        print "Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3])
-    
+        print("Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3]))
+
         # This is the default key for authentication
         key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
-        
+
         # Select the scanned tag
         MIFAREReader.MFRC522_SelectTag(uid)
 
diff --git a/MFRC522.py b/MFRC522.py
index d1ee8b6..f490fb4 100644
--- a/MFRC522.py
+++ b/MFRC522.py
@@ -1,416 +1,412 @@
-#!/usr/bin/env python
-# -*- coding: utf8 -*-
-#
-#    Copyright 2014,2018 Mario Gomez <mario.gomez@teubi.co>
-#
-#    This file is part of MFRC522-Python
-#    MFRC522-Python is a simple Python implementation for
-#    the MFRC522 NFC Card Reader for the Raspberry Pi.
-#
-#    MFRC522-Python is free software: you can redistribute it and/or modify
-#    it under the terms of the GNU Lesser General Public License as published by
-#    the Free Software Foundation, either version 3 of the License, or
-#    (at your option) any later version.
-#
-#    MFRC522-Python is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU Lesser General Public License for more details.
-#
-#    You should have received a copy of the GNU Lesser General Public License
-#    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
-#
-
-import RPi.GPIO as GPIO
-import spi
-import signal
-import time
-  
-class MFRC522:
-  NRSTPD = 22
-  
-  MAX_LEN = 16
-  
-  PCD_IDLE       = 0x00
-  PCD_AUTHENT    = 0x0E
-  PCD_RECEIVE    = 0x08
-  PCD_TRANSMIT   = 0x04
-  PCD_TRANSCEIVE = 0x0C
-  PCD_RESETPHASE = 0x0F
-  PCD_CALCCRC    = 0x03
-  
-  PICC_REQIDL    = 0x26
-  PICC_REQALL    = 0x52
-  PICC_ANTICOLL  = 0x93
-  PICC_SElECTTAG = 0x93
-  PICC_AUTHENT1A = 0x60
-  PICC_AUTHENT1B = 0x61
-  PICC_READ      = 0x30
-  PICC_WRITE     = 0xA0
-  PICC_DECREMENT = 0xC0
-  PICC_INCREMENT = 0xC1
-  PICC_RESTORE   = 0xC2
-  PICC_TRANSFER  = 0xB0
-  PICC_HALT      = 0x50
-  
-  MI_OK       = 0
-  MI_NOTAGERR = 1
-  MI_ERR      = 2
-  
-  Reserved00     = 0x00
-  CommandReg     = 0x01
-  CommIEnReg     = 0x02
-  DivlEnReg      = 0x03
-  CommIrqReg     = 0x04
-  DivIrqReg      = 0x05
-  ErrorReg       = 0x06
-  Status1Reg     = 0x07
-  Status2Reg     = 0x08
-  FIFODataReg    = 0x09
-  FIFOLevelReg   = 0x0A
-  WaterLevelReg  = 0x0B
-  ControlReg     = 0x0C
-  BitFramingReg  = 0x0D
-  CollReg        = 0x0E
-  Reserved01     = 0x0F
-  
-  Reserved10     = 0x10
-  ModeReg        = 0x11
-  TxModeReg      = 0x12
-  RxModeReg      = 0x13
-  TxControlReg   = 0x14
-  TxAutoReg      = 0x15
-  TxSelReg       = 0x16
-  RxSelReg       = 0x17
-  RxThresholdReg = 0x18
-  DemodReg       = 0x19
-  Reserved11     = 0x1A
-  Reserved12     = 0x1B
-  MifareReg      = 0x1C
-  Reserved13     = 0x1D
-  Reserved14     = 0x1E
-  SerialSpeedReg = 0x1F
-  
-  Reserved20        = 0x20  
-  CRCResultRegM     = 0x21
-  CRCResultRegL     = 0x22
-  Reserved21        = 0x23
-  ModWidthReg       = 0x24
-  Reserved22        = 0x25
-  RFCfgReg          = 0x26
-  GsNReg            = 0x27
-  CWGsPReg          = 0x28
-  ModGsPReg         = 0x29
-  TModeReg          = 0x2A
-  TPrescalerReg     = 0x2B
-  TReloadRegH       = 0x2C
-  TReloadRegL       = 0x2D
-  TCounterValueRegH = 0x2E
-  TCounterValueRegL = 0x2F
-  
-  Reserved30      = 0x30
-  TestSel1Reg     = 0x31
-  TestSel2Reg     = 0x32
-  TestPinEnReg    = 0x33
-  TestPinValueReg = 0x34
-  TestBusReg      = 0x35
-  AutoTestReg     = 0x36
-  VersionReg      = 0x37
-  AnalogTestReg   = 0x38
-  TestDAC1Reg     = 0x39
-  TestDAC2Reg     = 0x3A
-  TestADCReg      = 0x3B
-  Reserved31      = 0x3C
-  Reserved32      = 0x3D
-  Reserved33      = 0x3E
-  Reserved34      = 0x3F
-    
-  serNum = []
-  
-  def __init__(self, dev='/dev/spidev0.0', spd=1000000):
-    spi.openSPI(device=dev,speed=spd)
-    GPIO.setmode(GPIO.BOARD)
-    GPIO.setup(self.NRSTPD, GPIO.OUT)
-    GPIO.output(self.NRSTPD, 1)
-    self.MFRC522_Init()
-  
-  def MFRC522_Reset(self):
-    self.Write_MFRC522(self.CommandReg, self.PCD_RESETPHASE)
-  
-  def Write_MFRC522(self, addr, val):
-    spi.transfer(((addr<<1)&0x7E,val))
-  
-  def Read_MFRC522(self, addr):
-    val = spi.transfer((((addr<<1)&0x7E) | 0x80,0))
-    return val[1]
-  
-  def SetBitMask(self, reg, mask):
-    tmp = self.Read_MFRC522(reg)
-    self.Write_MFRC522(reg, tmp | mask)
-    
-  def ClearBitMask(self, reg, mask):
-    tmp = self.Read_MFRC522(reg);
-    self.Write_MFRC522(reg, tmp & (~mask))
-  
-  def AntennaOn(self):
-    temp = self.Read_MFRC522(self.TxControlReg)
-    if(~(temp & 0x03)):
-      self.SetBitMask(self.TxControlReg, 0x03)
-  
-  def AntennaOff(self):
-    self.ClearBitMask(self.TxControlReg, 0x03)
-  
-  def MFRC522_ToCard(self,command,sendData):
-    backData = []
-    backLen = 0
-    status = self.MI_ERR
-    irqEn = 0x00
-    waitIRq = 0x00
-    lastBits = None
-    n = 0
-    i = 0
-    
-    if command == self.PCD_AUTHENT:
-      irqEn = 0x12
-      waitIRq = 0x10
-    if command == self.PCD_TRANSCEIVE:
-      irqEn = 0x77
-      waitIRq = 0x30
-    
-    self.Write_MFRC522(self.CommIEnReg, irqEn|0x80)
-    self.ClearBitMask(self.CommIrqReg, 0x80)
-    self.SetBitMask(self.FIFOLevelReg, 0x80)
-    
-    self.Write_MFRC522(self.CommandReg, self.PCD_IDLE);  
-    
-    while(i<len(sendData)):
-      self.Write_MFRC522(self.FIFODataReg, sendData[i])
-      i = i+1
-    
-    self.Write_MFRC522(self.CommandReg, command)
-      
-    if command == self.PCD_TRANSCEIVE:
-      self.SetBitMask(self.BitFramingReg, 0x80)
-    
-    i = 2000
-    while True:
-      n = self.Read_MFRC522(self.CommIrqReg)
-      i = i - 1
-      if ~((i!=0) and ~(n&0x01) and ~(n&waitIRq)):
-        break
-    
-    self.ClearBitMask(self.BitFramingReg, 0x80)
-  
-    if i != 0:
-      if (self.Read_MFRC522(self.ErrorReg) & 0x1B)==0x00:
-        status = self.MI_OK
-
-        if n & irqEn & 0x01:
-          status = self.MI_NOTAGERR
-      
-        if command == self.PCD_TRANSCEIVE:
-          n = self.Read_MFRC522(self.FIFOLevelReg)
-          lastBits = self.Read_MFRC522(self.ControlReg) & 0x07
-          if lastBits != 0:
-            backLen = (n-1)*8 + lastBits
-          else:
-            backLen = n*8
-          
-          if n == 0:
-            n = 1
-          if n > self.MAX_LEN:
-            n = self.MAX_LEN
-    
-          i = 0
-          while i<n:
-            backData.append(self.Read_MFRC522(self.FIFODataReg))
-            i = i + 1;
-      else:
-        status = self.MI_ERR
-
-    return (status,backData,backLen)
-  
-  
-  def MFRC522_Request(self, reqMode):
-    status = None
-    backBits = None
-    TagType = []
-    
-    self.Write_MFRC522(self.BitFramingReg, 0x07)
-    
-    TagType.append(reqMode);
-    (status,backData,backBits) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, TagType)
-  
-    if ((status != self.MI_OK) | (backBits != 0x10)):
-      status = self.MI_ERR
-      
-    return (status,backBits)
-  
-  
-  def MFRC522_Anticoll(self):
-    backData = []
-    serNumCheck = 0
-    
-    serNum = []
-  
-    self.Write_MFRC522(self.BitFramingReg, 0x00)
-    
-    serNum.append(self.PICC_ANTICOLL)
-    serNum.append(0x20)
-    
-    (status,backData,backBits) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE,serNum)
-    
-    if(status == self.MI_OK):
-      i = 0
-      if len(backData)==5:
-        while i<4:
-          serNumCheck = serNumCheck ^ backData[i]
-          i = i + 1
-        if serNumCheck != backData[i]:
-          status = self.MI_ERR
-      else:
-        status = self.MI_ERR
-  
-    return (status,backData)
-  
-  def CalulateCRC(self, pIndata):
-    self.ClearBitMask(self.DivIrqReg, 0x04)
-    self.SetBitMask(self.FIFOLevelReg, 0x80);
-    i = 0
-    while i<len(pIndata):
-      self.Write_MFRC522(self.FIFODataReg, pIndata[i])
-      i = i + 1
-    self.Write_MFRC522(self.CommandReg, self.PCD_CALCCRC)
-    i = 0xFF
-    while True:
-      n = self.Read_MFRC522(self.DivIrqReg)
-      i = i - 1
-      if not ((i != 0) and not (n&0x04)):
-        break
-    pOutData = []
-    pOutData.append(self.Read_MFRC522(self.CRCResultRegL))
-    pOutData.append(self.Read_MFRC522(self.CRCResultRegM))
-    return pOutData
-  
-  def MFRC522_SelectTag(self, serNum):
-    backData = []
-    buf = []
-    buf.append(self.PICC_SElECTTAG)
-    buf.append(0x70)
-    i = 0
-    while i<5:
-      buf.append(serNum[i])
-      i = i + 1
-    pOut = self.CalulateCRC(buf)
-    buf.append(pOut[0])
-    buf.append(pOut[1])
-    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, buf)
-    
-    if (status == self.MI_OK) and (backLen == 0x18):
-      print "Size: " + str(backData[0])
-      return    backData[0]
-    else:
-      return 0
-  
-  def MFRC522_Auth(self, authMode, BlockAddr, Sectorkey, serNum):
-    buff = []
-
-    # First byte should be the authMode (A or B)
-    buff.append(authMode)
-
-    # Second byte is the trailerBlock (usually 7)
-    buff.append(BlockAddr)
-
-    # Now we need to append the authKey which usually is 6 bytes of 0xFF
-    i = 0
-    while(i < len(Sectorkey)):
-      buff.append(Sectorkey[i])
-      i = i + 1
-    i = 0
-
-    # Next we append the first 4 bytes of the UID
-    while(i < 4):
-      buff.append(serNum[i])
-      i = i +1
-
-    # Now we start the authentication itself
-    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_AUTHENT,buff)
-
-    # Check if an error occurred
-    if not(status == self.MI_OK):
-      print "AUTH ERROR!!"
-    if not (self.Read_MFRC522(self.Status2Reg) & 0x08) != 0:
-      print "AUTH ERROR(status2reg & 0x08) != 0"
-
-    # Return the status
-    return status
-  
-  def MFRC522_StopCrypto1(self):
-    self.ClearBitMask(self.Status2Reg, 0x08)
-
-  def MFRC522_Read(self, blockAddr):
-    recvData = []
-    recvData.append(self.PICC_READ)
-    recvData.append(blockAddr)
-    pOut = self.CalulateCRC(recvData)
-    recvData.append(pOut[0])
-    recvData.append(pOut[1])
-    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, recvData)
-    if not(status == self.MI_OK):
-      print "Error while reading!"
-    i = 0
-    if len(backData) == 16:
-      print "Sector "+str(blockAddr)+" "+str(backData)
-  
-  def MFRC522_Write(self, blockAddr, writeData):
-    buff = []
-    buff.append(self.PICC_WRITE)
-    buff.append(blockAddr)
-    crc = self.CalulateCRC(buff)
-    buff.append(crc[0])
-    buff.append(crc[1])
-    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, buff)
-    if not(status == self.MI_OK) or not(backLen == 4) or not((backData[0] & 0x0F) == 0x0A):
-        status = self.MI_ERR
-    
-    print "%s backdata &0x0F == 0x0A %s" % (backLen, backData[0]&0x0F)
-    if status == self.MI_OK:
-        i = 0
-        buf = []
-        while i < 16:
-            buf.append(writeData[i])
-            i = i + 1
-        crc = self.CalulateCRC(buf)
-        buf.append(crc[0])
-        buf.append(crc[1])
-        (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE,buf)
-        if not(status == self.MI_OK) or not(backLen == 4) or not((backData[0] & 0x0F) == 0x0A):
-            print "Error while writing"
-        if status == self.MI_OK:
-            print "Data written"
-
-  def MFRC522_DumpClassic1K(self, key, uid):
-    i = 0
-    while i < 64:
-        status = self.MFRC522_Auth(self.PICC_AUTHENT1A, i, key, uid)
-        # Check if authenticated
-        if status == self.MI_OK:
-            self.MFRC522_Read(i)
-        else:
-            print "Authentication error"
-        i = i+1
-
-  def MFRC522_Init(self):
-    GPIO.output(self.NRSTPD, 1)
-  
-    self.MFRC522_Reset();
-    
-    
-    self.Write_MFRC522(self.TModeReg, 0x8D)
-    self.Write_MFRC522(self.TPrescalerReg, 0x3E)
-    self.Write_MFRC522(self.TReloadRegL, 30)
-    self.Write_MFRC522(self.TReloadRegH, 0)
-    
-    self.Write_MFRC522(self.TxAutoReg, 0x40)
-    self.Write_MFRC522(self.ModeReg, 0x3D)
-    self.AntennaOn()
+#!/usr/bin/env python
+# -*- coding: utf8 -*-
+#
+#    Copyright 2014,2018 Mario Gomez <mario.gomez@teubi.co>
+#
+#    This file is part of MFRC522-Python
+#    MFRC522-Python is a simple Python implementation for
+#    the MFRC522 NFC Card Reader for the Raspberry Pi.
+#
+#    MFRC522-Python is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    MFRC522-Python is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import RPi.GPIO as GPIO
+import spi
+
+class MFRC522:
+  NRSTPD = 22
+
+  MAX_LEN = 16
+
+  PCD_IDLE       = 0x00
+  PCD_AUTHENT    = 0x0E
+  PCD_RECEIVE    = 0x08
+  PCD_TRANSMIT   = 0x04
+  PCD_TRANSCEIVE = 0x0C
+  PCD_RESETPHASE = 0x0F
+  PCD_CALCCRC    = 0x03
+
+  PICC_REQIDL    = 0x26
+  PICC_REQALL    = 0x52
+  PICC_ANTICOLL  = 0x93
+  PICC_SElECTTAG = 0x93
+  PICC_AUTHENT1A = 0x60
+  PICC_AUTHENT1B = 0x61
+  PICC_READ      = 0x30
+  PICC_WRITE     = 0xA0
+  PICC_DECREMENT = 0xC0
+  PICC_INCREMENT = 0xC1
+  PICC_RESTORE   = 0xC2
+  PICC_TRANSFER  = 0xB0
+  PICC_HALT      = 0x50
+
+  MI_OK       = 0
+  MI_NOTAGERR = 1
+  MI_ERR      = 2
+
+  Reserved00     = 0x00
+  CommandReg     = 0x01
+  CommIEnReg     = 0x02
+  DivlEnReg      = 0x03
+  CommIrqReg     = 0x04
+  DivIrqReg      = 0x05
+  ErrorReg       = 0x06
+  Status1Reg     = 0x07
+  Status2Reg     = 0x08
+  FIFODataReg    = 0x09
+  FIFOLevelReg   = 0x0A
+  WaterLevelReg  = 0x0B
+  ControlReg     = 0x0C
+  BitFramingReg  = 0x0D
+  CollReg        = 0x0E
+  Reserved01     = 0x0F
+
+  Reserved10     = 0x10
+  ModeReg        = 0x11
+  TxModeReg      = 0x12
+  RxModeReg      = 0x13
+  TxControlReg   = 0x14
+  TxAutoReg      = 0x15
+  TxSelReg       = 0x16
+  RxSelReg       = 0x17
+  RxThresholdReg = 0x18
+  DemodReg       = 0x19
+  Reserved11     = 0x1A
+  Reserved12     = 0x1B
+  MifareReg      = 0x1C
+  Reserved13     = 0x1D
+  Reserved14     = 0x1E
+  SerialSpeedReg = 0x1F
+
+  Reserved20        = 0x20
+  CRCResultRegM     = 0x21
+  CRCResultRegL     = 0x22
+  Reserved21        = 0x23
+  ModWidthReg       = 0x24
+  Reserved22        = 0x25
+  RFCfgReg          = 0x26
+  GsNReg            = 0x27
+  CWGsPReg          = 0x28
+  ModGsPReg         = 0x29
+  TModeReg          = 0x2A
+  TPrescalerReg     = 0x2B
+  TReloadRegH       = 0x2C
+  TReloadRegL       = 0x2D
+  TCounterValueRegH = 0x2E
+  TCounterValueRegL = 0x2F
+
+  Reserved30      = 0x30
+  TestSel1Reg     = 0x31
+  TestSel2Reg     = 0x32
+  TestPinEnReg    = 0x33
+  TestPinValueReg = 0x34
+  TestBusReg      = 0x35
+  AutoTestReg     = 0x36
+  VersionReg      = 0x37
+  AnalogTestReg   = 0x38
+  TestDAC1Reg     = 0x39
+  TestDAC2Reg     = 0x3A
+  TestADCReg      = 0x3B
+  Reserved31      = 0x3C
+  Reserved32      = 0x3D
+  Reserved33      = 0x3E
+  Reserved34      = 0x3F
+
+  serNum = []
+
+  def __init__(self, dev='/dev/spidev0.0', spd=1000000):
+    spi.openSPI(device=dev,speed=spd)
+    GPIO.setmode(GPIO.BOARD)
+    GPIO.setup(self.NRSTPD, GPIO.OUT, initial=GPIO.HIGH)
+
+    self.MFRC522_Reset()
+
+    self.Write_MFRC522(self.TModeReg, 0x8D)
+    self.Write_MFRC522(self.TPrescalerReg, 0x3E)
+    self.Write_MFRC522(self.TReloadRegL, 30)
+    self.Write_MFRC522(self.TReloadRegH, 0)
+
+    self.Write_MFRC522(self.TxAutoReg, 0x40)
+    self.Write_MFRC522(self.ModeReg, 0x3D)
+    self.AntennaOn()
+
+  def __del__(self):
+      GPIO.cleanup([self.NRSTPD])
+
+  def MFRC522_Reset(self):
+    self.Write_MFRC522(self.CommandReg, self.PCD_RESETPHASE)
+
+  def Write_MFRC522(self, addr, val):
+    spi.transfer(((addr<<1)&0x7E,val))
+
+  def Read_MFRC522(self, addr):
+    val = spi.transfer((((addr<<1)&0x7E) | 0x80,0))
+    return val[1]
+
+  def SetBitMask(self, reg, mask):
+    tmp = self.Read_MFRC522(reg)
+    self.Write_MFRC522(reg, tmp | mask)
+
+  def ClearBitMask(self, reg, mask):
+    tmp = self.Read_MFRC522(reg)
+    self.Write_MFRC522(reg, tmp & (~mask))
+
+  def AntennaOn(self):
+    temp = self.Read_MFRC522(self.TxControlReg)
+    if(~(temp & 0x03)):
+      self.SetBitMask(self.TxControlReg, 0x03)
+
+  def AntennaOff(self):
+    self.ClearBitMask(self.TxControlReg, 0x03)
+
+  def MFRC522_ToCard(self,command,sendData):
+    backData = []
+    backLen = 0
+    status = self.MI_ERR
+    irqEn = 0x00
+    waitIRq = 0x00
+    lastBits = None
+    n = 0
+    i = 0
+
+    if command == self.PCD_AUTHENT:
+      irqEn = 0x12
+      waitIRq = 0x10
+    if command == self.PCD_TRANSCEIVE:
+      irqEn = 0x77
+      waitIRq = 0x30
+
+    self.Write_MFRC522(self.CommIEnReg, irqEn|0x80)
+    self.ClearBitMask(self.CommIrqReg, 0x80)
+    self.SetBitMask(self.FIFOLevelReg, 0x80)
+
+    self.Write_MFRC522(self.CommandReg, self.PCD_IDLE)
+
+    while(i<len(sendData)):
+      self.Write_MFRC522(self.FIFODataReg, sendData[i])
+      i = i+1
+
+    self.Write_MFRC522(self.CommandReg, command)
+
+    if command == self.PCD_TRANSCEIVE:
+      self.SetBitMask(self.BitFramingReg, 0x80)
+
+    i = 2000
+    while True:
+      n = self.Read_MFRC522(self.CommIrqReg)
+      i = i - 1
+      if ~((i!=0) and ~(n&0x01) and ~(n&waitIRq)):
+        break
+
+    self.ClearBitMask(self.BitFramingReg, 0x80)
+
+    if i != 0:
+      if (self.Read_MFRC522(self.ErrorReg) & 0x1B)==0x00:
+        status = self.MI_OK
+
+        if n & irqEn & 0x01:
+          status = self.MI_NOTAGERR
+
+        if command == self.PCD_TRANSCEIVE:
+          n = self.Read_MFRC522(self.FIFOLevelReg)
+          lastBits = self.Read_MFRC522(self.ControlReg) & 0x07
+          if lastBits != 0:
+            backLen = (n-1)*8 + lastBits
+          else:
+            backLen = n*8
+
+          if n == 0:
+            n = 1
+          if n > self.MAX_LEN:
+            n = self.MAX_LEN
+
+          i = 0
+          while i<n:
+            backData.append(self.Read_MFRC522(self.FIFODataReg))
+            i = i + 1
+      else:
+        status = self.MI_ERR
+
+    return (status,backData,backLen)
+
+
+  def MFRC522_Request(self, reqMode):
+    status = None
+    backBits = None
+    TagType = []
+
+    self.Write_MFRC522(self.BitFramingReg, 0x07)
+
+    TagType.append(reqMode)
+    (status,backData,backBits) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, TagType)
+
+    if ((status != self.MI_OK) | (backBits != 0x10)):
+      status = self.MI_ERR
+
+    return (status,backBits)
+
+
+  def MFRC522_Anticoll(self):
+    backData = []
+    serNumCheck = 0
+
+    serNum = []
+
+    self.Write_MFRC522(self.BitFramingReg, 0x00)
+
+    serNum.append(self.PICC_ANTICOLL)
+    serNum.append(0x20)
+
+    (status,backData,backBits) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE,serNum)
+
+    if(status == self.MI_OK):
+      i = 0
+      if len(backData)==5:
+        while i<4:
+          serNumCheck = serNumCheck ^ backData[i]
+          i = i + 1
+        if serNumCheck != backData[i]:
+          status = self.MI_ERR
+      else:
+        status = self.MI_ERR
+
+    return (status,backData)
+
+  def CalulateCRC(self, pIndata):
+    self.ClearBitMask(self.DivIrqReg, 0x04)
+    self.SetBitMask(self.FIFOLevelReg, 0x80)
+    i = 0
+    while i<len(pIndata):
+      self.Write_MFRC522(self.FIFODataReg, pIndata[i])
+      i = i + 1
+    self.Write_MFRC522(self.CommandReg, self.PCD_CALCCRC)
+    i = 0xFF
+    while True:
+      n = self.Read_MFRC522(self.DivIrqReg)
+      i = i - 1
+      if not ((i != 0) and not (n&0x04)):
+        break
+    pOutData = []
+    pOutData.append(self.Read_MFRC522(self.CRCResultRegL))
+    pOutData.append(self.Read_MFRC522(self.CRCResultRegM))
+    return pOutData
+
+  def MFRC522_SelectTag(self, serNum):
+    backData = []
+    buf = []
+    buf.append(self.PICC_SElECTTAG)
+    buf.append(0x70)
+    i = 0
+    while i<5:
+      buf.append(serNum[i])
+      i = i + 1
+    pOut = self.CalulateCRC(buf)
+    buf.append(pOut[0])
+    buf.append(pOut[1])
+    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, buf)
+
+    if (status == self.MI_OK) and (backLen == 0x18):
+      print("Size: " + str(backData[0]))
+      return    backData[0]
+    else:
+      return 0
+
+  def MFRC522_Auth(self, authMode, BlockAddr, Sectorkey, serNum):
+    buff = []
+
+    # First byte should be the authMode (A or B)
+    buff.append(authMode)
+
+    # Second byte is the trailerBlock (usually 7)
+    buff.append(BlockAddr)
+
+    # Now we need to append the authKey which usually is 6 bytes of 0xFF
+    i = 0
+    while(i < len(Sectorkey)):
+      buff.append(Sectorkey[i])
+      i = i + 1
+    i = 0
+
+    # Next we append the first 4 bytes of the UID
+    while(i < 4):
+      buff.append(serNum[i])
+      i = i +1
+
+    # Now we start the authentication itself
+    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_AUTHENT,buff)
+
+    # Check if an error occurred
+    if not(status == self.MI_OK):
+      print("AUTH ERROR!!")
+    if not (self.Read_MFRC522(self.Status2Reg) & 0x08) != 0:
+      print("AUTH ERROR(status2reg & 0x08) != 0")
+
+    # Return the status
+    return status
+
+  def MFRC522_StopCrypto1(self):
+    self.ClearBitMask(self.Status2Reg, 0x08)
+
+  def MFRC522_Read(self, blockAddr):
+    recvData = []
+    recvData.append(self.PICC_READ)
+    recvData.append(blockAddr)
+    pOut = self.CalulateCRC(recvData)
+    recvData.append(pOut[0])
+    recvData.append(pOut[1])
+    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, recvData)
+    if not(status == self.MI_OK):
+      print("Error while reading!")
+    i = 0
+    if len(backData) == 16:
+      print("Sector "+str(blockAddr)+" "+str(backData))
+
+  def MFRC522_Write(self, blockAddr, writeData):
+    buff = []
+    buff.append(self.PICC_WRITE)
+    buff.append(blockAddr)
+    crc = self.CalulateCRC(buff)
+    buff.append(crc[0])
+    buff.append(crc[1])
+    (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE, buff)
+    if not(status == self.MI_OK) or not(backLen == 4) or not((backData[0] & 0x0F) == 0x0A):
+        status = self.MI_ERR
+
+    print("%s backdata &0x0F == 0x0A %s" % (backLen, backData[0]&0x0F))
+    if status == self.MI_OK:
+        i = 0
+        buf = []
+        while i < 16:
+            buf.append(writeData[i])
+            i = i + 1
+        crc = self.CalulateCRC(buf)
+        buf.append(crc[0])
+        buf.append(crc[1])
+        (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_TRANSCEIVE,buf)
+        if not(status == self.MI_OK) or not(backLen == 4) or not((backData[0] & 0x0F) == 0x0A):
+            print("Error while writing")
+        if status == self.MI_OK:
+            print("Data written")
+
+  def MFRC522_DumpClassic1K(self, key, uid):
+    i = 0
+    while i < 64:
+        status = self.MFRC522_Auth(self.PICC_AUTHENT1A, i, key, uid)
+        # Check if authenticated
+        if status == self.MI_OK:
+            self.MFRC522_Read(i)
+        else:
+            print("Authentication error")
+        i = i+1
+
diff --git a/Read.py b/Read.py
index cc395c5..32b04bb 100644
--- a/Read.py
+++ b/Read.py
@@ -21,7 +21,6 @@
 #    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import RPi.GPIO as GPIO
 import MFRC522
 import signal
 
@@ -30,9 +29,8 @@
 # Capture SIGINT for cleanup when the script is aborted
 def end_read(signal,frame):
     global continue_reading
-    print "Ctrl+C captured, ending read."
+    print("Ctrl+C captured, ending read.")
     continue_reading = False
-    GPIO.cleanup()
 
 # Hook the SIGINT
 signal.signal(signal.SIGINT, end_read)
@@ -41,19 +39,19 @@ def end_read(signal,frame):
 MIFAREReader = MFRC522.MFRC522()
 
 # Welcome message
-print "Welcome to the MFRC522 data read example"
-print "Press Ctrl-C to stop."
+print("Welcome to the MFRC522 data read example")
+print("Press Ctrl-C to stop.")
 
 # This loop keeps checking for chips. If one is near it will get the UID and authenticate
 while continue_reading:
-    
-    # Scan for cards    
+
+    # Scan for cards
     (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
 
     # If a card is found
     if status == MIFAREReader.MI_OK:
-        print "Card detected"
-    
+        print("Card detected")
+
     # Get the UID of the card
     (status,uid) = MIFAREReader.MFRC522_Anticoll()
 
@@ -61,11 +59,11 @@ def end_read(signal,frame):
     if status == MIFAREReader.MI_OK:
 
         # Print UID
-        print "Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3])
-    
+        print("Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3]))
+
         # This is the default key for authentication
         key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
-        
+
         # Select the scanned tag
         MIFAREReader.MFRC522_SelectTag(uid)
 
@@ -77,5 +75,5 @@ def end_read(signal,frame):
             MIFAREReader.MFRC522_Read(8)
             MIFAREReader.MFRC522_StopCrypto1()
         else:
-            print "Authentication error"
+            print("Authentication error")
 
diff --git a/Write.py b/Write.py
index 237e268..a04d055 100644
--- a/Write.py
+++ b/Write.py
@@ -21,7 +21,6 @@
 #    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import RPi.GPIO as GPIO
 import MFRC522
 import signal
 
@@ -32,7 +31,6 @@ def end_read(signal,frame):
     global continue_reading
     print "Ctrl+C captured, ending read."
     continue_reading = False
-    GPIO.cleanup()
 
 # Hook the SIGINT
 signal.signal(signal.SIGINT, end_read)
@@ -42,14 +40,14 @@ def end_read(signal,frame):
 
 # This loop keeps checking for chips. If one is near it will get the UID and authenticate
 while continue_reading:
-    
-    # Scan for cards    
+
+    # Scan for cards
     (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
 
     # If a card is found
     if status == MIFAREReader.MI_OK:
-        print "Card detected"
-    
+        print("Card detected")
+
     # Get the UID of the card
     (status,uid) = MIFAREReader.MFRC522_Anticoll()
 
@@ -57,17 +55,17 @@ def end_read(signal,frame):
     if status == MIFAREReader.MI_OK:
 
         # Print UID
-        print "Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3])
-    
+        print("Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3]))
+
         # This is the default key for authentication
         key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
-        
+
         # Select the scanned tag
         MIFAREReader.MFRC522_SelectTag(uid)
 
         # Authenticate
         status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 8, key, uid)
-        print "\n"
+        print("\n")
 
         # Check if authenticated
         if status == MIFAREReader.MI_OK:
@@ -79,34 +77,34 @@ def end_read(signal,frame):
             for x in range(0,16):
                 data.append(0xFF)
 
-            print "Sector 8 looked like this:"
+            print("Sector 8 looked like this:")
             # Read block 8
             MIFAREReader.MFRC522_Read(8)
-            print "\n"
+            print("\n")
 
-            print "Sector 8 will now be filled with 0xFF:"
+            print("Sector 8 will now be filled with 0xFF:")
             # Write the data
             MIFAREReader.MFRC522_Write(8, data)
-            print "\n"
+            print
 
-            print "It now looks like this:"
+            print("It now looks like this:")
             # Check to see if it was written
             MIFAREReader.MFRC522_Read(8)
-            print "\n"
+            print("\n")
 
             data = []
             # Fill the data with 0x00
             for x in range(0,16):
                 data.append(0x00)
 
-            print "Now we fill it with 0x00:"
+            print("Now we fill it with 0x00:")
             MIFAREReader.MFRC522_Write(8, data)
-            print "\n"
+            print("\n")
 
-            print "It is now empty:"
+            print("It is now empty:")
             # Check to see if it was written
             MIFAREReader.MFRC522_Read(8)
-            print "\n"
+            print("\n")
 
             # Stop
             MIFAREReader.MFRC522_StopCrypto1()