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Merge pull request #8 from mj3052/master

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Fixed authentication, added examples.
This commit is contained in:
mxgxw 2014-06-24 08:15:18 -06:00
commit deae8836b4
5 changed files with 254 additions and 58 deletions
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49
Dump.py Executable file
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@ -0,0 +1,49 @@
import RPi.GPIO as GPIO
import MFRC522
import signal
continue_reading = True
# Capture SIGINT for cleanup when the script is aborted
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)
# Create an object of the class MFRC522
MIFAREReader = MFRC522.MFRC522()
# This loop keeps checking for chips. If one is near it will get the UID and authenticate
while continue_reading:
# Scan for cards
(status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
# If a card is found
if status == MIFAREReader.MI_OK:
print "Card detected"
# Get the UID of the card
(status,uid) = MIFAREReader.MFRC522_Anticoll()
# If we have the UID, continue
if status == MIFAREReader.MI_OK:
# Print UID
print "Card read UID: "+str(uid[0])+","+str(uid[1])+","+str(uid[2])+","+str(uid[3])
# This is the default key for authentication
key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
# Select the scanned tag
MIFAREReader.MFRC522_SelectTag(uid)
# Dump the data
MIFAREReader.MFRC522_DumpClassic1K(key, uid)
# Stop
MIFAREReader.MFRC522_StopCrypto1()

76
MFRC522.py Normal file → Executable file
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@ -1,6 +1,7 @@
import RPi.GPIO as GPIO
import spi
import signal
import time
class MFRC522:
NRSTPD = 22
@ -284,30 +285,46 @@ class MFRC522:
if (status == self.MI_OK) and (backLen == 0x18):
print "Size: " + str(backData[0])
return 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
while(i < len(serNum)):
# 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)
@ -318,8 +335,6 @@ class MFRC522:
(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)
@ -333,24 +348,34 @@ class MFRC522:
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
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
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"
print "Error while writing"
if status == self.MI_OK:
print "Data writen"
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)
@ -366,36 +391,3 @@ class MFRC522:
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
GPIO.cleanup() # Suggested by Marjan Trutschl
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])
key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
MIFAREReader.MFRC522_SelectTag(backData)
status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 11, key, backData)
if status == MIFAREReader.MI_OK:
print "AUTH OK"
else:
print "AUTH ERROR"

31
README.md
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@ -5,21 +5,26 @@ A small class to interface with the NFC reader Module MFRC522 on the Raspberry P
This is a Python port of the example code for the NFC module MF522-AN.
Pre Requisites
==============
You will need to install SPI-Py from lthiery from the following address:
##Requirements
This code requires you to have SPI-Py installed from the following repository:
https://github.com/lthiery/SPI-Py
More Info
==============
##Examples
This repository includes a couple of examples showing how to read, write, and dump data from a chip. They are thoroughly commented, and should be easy to understand.
For more information visit: http://fuenteabierta.teubi.co/
## Pins
You can use [this](http://i.imgur.com/y7Fnvhq.png) image for reference.
Usage
==============
| Name | Pin # | Pin name |
|------|-------|------------|
| SDA | 24 | GPIO8 |
| SCK | 23 | GPIO11 |
| MOSI | 19 | GPIO10 |
| MISO | 21 | GPIO9 |
| IRQ | None | None |
| GND | Any | Any Ground |
| RST | 22 | GPIO25 |
| 3.3V | 1 | 3V3 |
Just run the following command:
sudo python MFRC522.py
##Usage
Import the class by importing MFRC522 in the top of your script. For more info see the examples.

56
Read.py Executable file
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@ -0,0 +1,56 @@
import RPi.GPIO as GPIO
import MFRC522
import signal
continue_reading = True
# Capture SIGINT for cleanup when the script is aborted
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)
# Create an object of the class MFRC522
MIFAREReader = MFRC522.MFRC522()
# This loop keeps checking for chips. If one is near it will get the UID and authenticate
while continue_reading:
# Scan for cards
(status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
# If a card is found
if status == MIFAREReader.MI_OK:
print "Card detected"
# Get the UID of the card
(status,uid) = MIFAREReader.MFRC522_Anticoll()
# If we have the UID, continue
if status == MIFAREReader.MI_OK:
# Print UID
print "Card read UID: "+str(uid[0])+","+str(uid[1])+","+str(uid[2])+","+str(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)
# Check if authenticated
if status == MIFAREReader.MI_OK:
MIFAREReader.MFRC522_Read(8)
MIFAREReader.MFRC522_StopCrypto1()
else:
print "Authentication error"
# Make sure to stop scanning for cards
continue_reading = false

94
Write.py Executable file
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@ -0,0 +1,94 @@
import RPi.GPIO as GPIO
import MFRC522
import signal
continue_reading = True
# Capture SIGINT for cleanup when the script is aborted
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)
# Create an object of the class MFRC522
MIFAREReader = MFRC522.MFRC522()
# This loop keeps checking for chips. If one is near it will get the UID and authenticate
while continue_reading:
# Scan for cards
(status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
# If a card is found
if status == MIFAREReader.MI_OK:
print "Card detected"
# Get the UID of the card
(status,uid) = MIFAREReader.MFRC522_Anticoll()
# If we have the UID, continue
if status == MIFAREReader.MI_OK:
# Print UID
print "Card read UID: "+str(uid[0])+","+str(uid[1])+","+str(uid[2])+","+str(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"
# Check if authenticated
if status == MIFAREReader.MI_OK:
# Variable for the data to write
data = []
# Fill the data with 0xFF
for x in range(0,16):
data.append(0xFF)
print "Sector 8 looked like this:"
# Read block 8
MIFAREReader.MFRC522_Read(8)
print "\n"
print "Sector 8 will now be filled with 0xFF:"
# Write the data
MIFAREReader.MFRC522_Write(8, data)
print "\n"
print "It now looks like this:"
# Check to see if it was written
MIFAREReader.MFRC522_Read(8)
print "\n"
data = []
# Fill the data with 0x00
for x in range(0,16):
data.append(0x00)
print "Now we fill it with 0x00:"
MIFAREReader.MFRC522_Write(8, data)
print "\n"
print "It is now empty:"
# Check to see if it was written
MIFAREReader.MFRC522_Read(8)
print "\n"
# Stop
MIFAREReader.MFRC522_StopCrypto1()
# Make sure to stop reading for cards
continue_reading = False
else:
print "Authentication error"