MFRC522-python/Write.py

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Python
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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"