Cannot read android emulated NFC card

eagleflysky commented 4 years ago

I'm using your lib to read Mifare Card with ESP8266. It works very well. However it cannot read emulated NFC card on my cellphone . I repace RC522 module with PN532 module and use Adafruit_PN532 lib, the emulated NFC card can be read out. I used another cellphone with Taginfo to read the emulated NFC card, it shows below info:

Technologies supported: ISO/IEC 14443-3(Type A) compatible ISO/IEC 14443-3(Type A) compatible Android technology information Tag description: TAG:Tech[android.nfc.tech.NfcA] android.nfc.tech.MifareClassic android.nfc.tech.NdefFormatable] android.nfc.tech.NdefFormatable android.nfc.tech.MifareClassic android.nfc.tech.NfcA Maximum transceive length:253 bytes Default maximum transceive time-out:618ms Detailed protocal information ID: 23:C5:CB:04 ATQA:0x0400 SAK:0x08 ATS:0x05788070020000000000000000000000 Max.accepted frame size:256 bytes(FSCI:8) Supported receive rates: .106kbit/s(DR:1) Supported send rates: .106kbit/s(DR:1) SFGT: 302.0us(SFGI:0) FWT:38.66ms(FWI:7) NAD not supported CID supported Historical bytes:[none]

Will this lib support emulated NFC card later? Thanks

Rotzbua commented 4 years ago

As far as I know, this is a hardware limitation by the mfrc522, as mentioned in the readme. The pn532 work because it has more abilities.

You can cross check with a raspberry + python mfrc522 library. If mfrc522+raspberry+emulated card work, then we have a software problem in this library.

Best.

eagleflysky commented 4 years ago

Hi, @Rotzbua I've tried on Raspi with MFRC522 lib(https://github.com/mxgxw/MFRC522-python.git), and the emulated card can be read out:

pi@raspberrypi:~/MFRC522-python $ python3 Read.py Welcome to the MFRC522 data read example Press Ctrl-C to stop. Card detected Card read UID: 51,32,211,4 Size: 8 Sector 8 [3, 17, 17, 20, 255, 255, 255, 25, 18, 18, 0, 0, 255, 255, 3, 16]

Rotzbua commented 4 years ago

The init config is different in python:

https://github.com/mxgxw/MFRC522-python/blob/cf7f9ec0cc928883700e7153529b50e5fc362ab0/MFRC522.py#L409-L412

Can you replace setting in MFRC522.cpp:

https://github.com/miguelbalboa/rfid/blob/ed5c081a54635d41147a47505638a44a663dcfbf/src/MFRC522.cpp#L229-L232

With:

    PCD_WriteRegister(TModeReg, 0x8D);
    PCD_WriteRegister(TPrescalerReg, 0x3E);
    PCD_WriteRegister(TReloadRegH, 0);
    PCD_WriteRegister(TReloadRegL, 30);

Maybe this helps..

eagleflysky commented 4 years ago

I did the math for the init parameters, it turns out the python library set the reload timer as 24ms before time out. It's not a big difference.

eagleflysky commented 4 years ago

Anyway , I've tested with modified init, still failed to read the emulated card

eagleflysky commented 4 years ago

I did 2 more tests:

Installed micropython(http://micropython.org/resources/firmware/esp8266-20191220-v1.12.bin), modified SPI driver of MFRC522 lib(https://github.com/mxgxw/MFRC522-python.git) for esp8266. Then ran the read test, the cellphone could be readout:

WebREPL connected
>>> import os
>>> os.listdir()
['boot.py', 'webrepl_cfg.py', 'MFRC522.py', 'reading.py']
>>> import reading
>>> reading.reading()
Card detected - 16
Card read UID: 51,32,211,4
Size: 8
Sector 8 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

eagleflysky commented 4 years ago

ported MFRC522-python to Arduino, it didn't work -- still failed to read cellphone , it worked for real card

eagleflysky commented 4 years ago

@Rotzbua Cellphone emulated card can be read after I updated this lib to latest version: )

miguelbalboa / rfid

Cannot read android emulated NFC card #517