ndef_read.py

from mfrc522 import MFRC522
import utime
              
reader = MFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=1,rst=0)

print("")
print("Place card into reader")
print("")



PreviousCard = [0]

try:
    while True:

        reader.init()
        (stat, tag_type) = reader.request(reader.REQIDL)
        if stat == reader.OK:
            (stat, uid) = reader.SelectTagSN()
            if uid == PreviousCard:
                continue

            if stat == reader.OK:
                print("Card detected {}  uid={}".format(hex(int.from_bytes(bytes(uid),"little",False)).upper(),reader.tohexstring(uid)))
                firstSectorKey = [0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5]
                nextSectorKey = [0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7]
                #defaultKey = [255,255,255,255,255,255]

                #read MAD sector  (first sector)
                if reader.MFRC522_DumpClassic1K(uid, Start=0, End=4, keyA=firstSectorKey)== reader.OK:
                    #read the rest of the card
                    reader.MFRC522_DumpClassic1K(uid, Start=4, End=64, keyA=nextSectorKey)
                print("Done")
                PreviousCard = uid
        else:
            PreviousCard=[0]
        utime.sleep_ms(50)                

except KeyboardInterrupt:
    print("Bye")