diff --git a/MFRC522.py b/MFRC522.py
index 889700a..f91f5bd 100644
--- a/MFRC522.py
+++ b/MFRC522.py
@@ -1,302 +1,395 @@
-import RPi.GPIO as GPIO
-import spi
-import signal
+	
 
-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 = []
-  
-  writeData = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100] 
-  moneyConsume = 18 
-  moneyAdd = 10 
-  
-  sectorKeyA = [
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],  
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
-  ]
-  
-  sectorNewKeyA = [
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14],
-    [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x33,0x07,0x15,0x34,0x14],
-  ]
-  
-  def __init__(self,spd=1000000):
-    spi.openSPI(speed=spd)
-    GPIO.setmode(GPIO.BOARD)
-    GPIO.setup(22, 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);  
+    import RPi.GPIO as GPIO
+    import spi
+    import signal
      
-    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
-      
+    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,spd=1000000):
+        spi.openSPI(speed=spd)
+        GPIO.setmode(GPIO.BOARD)
+        GPIO.setup(22, 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:
-          n = self.Read_MFRC522(self.FIFOLevelReg)
-          lastBits = self.Read_MFRC522(self.ControlReg) & 0x07
-          if lastBits != 0:
-            backLen = (n-1)*8 + lastBits
+          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:
-            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
+       
+        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
-      else:
-        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):
+          size = backData[0]
+        else:
+          size = 0
+        return size
+     
+      def MFRC522_Auth(self, authMode, BlockAddr, Sectorkey, serNum):
+        buff = []
+        buff.append(authMode)
+        buff.append(BlockAddr)
+        i = 0
+        while(i < 6):
+          buff.append(Sectorkey[i])
+          i = i + 1
+        i = 0
+        while(i < 4):
+          buff.append(serNum[i])
+          i = i +1
+        (status, backData, backLen) = self.MFRC522_ToCard(self.PCD_AUTHENT,buff)
+        if not(status == self.MI_OK):
+          print "AUTH ERROR!!"
+        if not(self.Read_MFRC522(self.Status2Reg) & 0x08):
+          print "AUTH ERROR(status2reg & 0x08 != 0"
+     
+      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!"
+       
+        print "Got data size: "+str(backLen)
+        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 str(backLen)+" backdata &0x0F == 0x0A "+str(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 writen"
+     
+     
+      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()
+     
+    continue_reading = True
+    # Capture SIGINT
+    def end_read(signal,frame):
+      global continue_reading
+      print "Ctrl+C captured, ending read."
+      continue_reading = False
+     
+    signal.signal(signal.SIGINT, end_read)
+     
+    MIFAREReader = MFRC522()
+     
+    while continue_reading:
+      (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
+     
+      if status == MIFAREReader.MI_OK:
+        print "Card detected"
+     
+      (status,backData) = MIFAREReader.MFRC522_Anticoll()
+      if status == MIFAREReader.MI_OK:
+        print "Card read UID: "+str(backData[0])+","+str(backData[1])+","+str(backData[2])+","+str(backData[3])+","+str(backData[4])
+        MIFAREReader.MFRC522_SelectTag(backData)
+        key = [0xFF,0xFF,0xFF,0xFF,0xFF]
+     
+     
+        MIFAREReader.MFRC522_Auth(0x60,0,keyA,backData)
+        MIFAREReader.MFRC522_Read(0)
+        i = 1
+        while i < 64:
+           MIFAREReader.MFRC522_Auth(0x60,i,keyA,backData)
+           MIFAREReader.MFRC522_Read(i)
+           i = i + 1
+     
 
-    return (status,backData)
-
-  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()
-
-continue_reading = True
-# Capture SIGINT
-def end_read(signal,frame):
-  global continue_reading
-  print "Ctrl+C captured, ending read."
-  continue_reading = False
-
-signal.signal(signal.SIGINT, end_read)
-
-MIFAREReader = MFRC522()
-
-while continue_reading:
-  (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
- 
-  if status == MIFAREReader.MI_OK:
-    print "Card detected"
-
-  (status,backData) = MIFAREReader.MFRC522_Anticoll()
-  if status == MIFAREReader.MI_OK:
-    print "Numero de la tarjeta: "+str(backData[0])+","+str(backData[1])+","+str(backData[2])+","+str(backData[3])+","+str(backData[4])