B4R Question PN532 and NFC Library

What does urgent mean? Yesterday, tomorrow, a few weeks from now?

Urgent means: the sooner, the better. Yesterday and tomorrow would be fine but I guess that might be a bit unrealistic . A few weeks from now will also be ok.

Any help will be highly appreciated.

I am also looking into this topic. Altough my PN532 and MFRC522 readers are still on there way from China. But in my opinion, there should be no way why the MFRC522 should not work with Mifare Desfire (I use EV2). They operate on the same frequency, so 'something' should be read from the card. If the NFC protocol is correctly applied, it should work (and DesFire cards are NFC)

Here is a topic on someone doing it with a MFRC522 reader on a RPI, and it seems to work: https://www.raspberrypi.org/forums/viewtopic.php?t=222832

It's just a matter of reading the right bits and bytes I think. But as said, my readers will arrive somewhere this month..

How far have you come with the MFRC522? Do you get something, or doesn't anything happen at all?

Hello Mathias,

so far I've used the MFRC522 together with the rMFRC522 library to read the UIDs of Mifare 1k and Ultralight transponders, and it works fine for these kinds of transponders. The current point of interest is to read Desfire transponders too.

Hello

Yes I understand, those cards are easy. DesFire cards have a different inner working. But the RC522 should be capable of reading it.
The problem with DesFire is that there is an OS running on those cards, and they need more power than the outdated (and unsafe) Mifare cards. El cheapo card readers are sometimes not perfectly wired or use sub-standard components.
But it seems to be possible to alter them to actually read DesFire cards, see this page: https://revspace.nl/RC522Hacking
I ordered a few to destroy them with my bad soldering.

Altough that's only the hardware side, reading the bits and bytes is part 2. But I cannot say anything useful about that because my readers are somewhere in the pacific.

That's why I asked that question on the final line, does anything happen at all? Are you getting giberish data? Or does nothing happen at all when you read your DesFire cards?

I guess you are right with both assumptions. I think, the main problem is that the rMFRC522 library isn't capable of reading the Desfire code.

When I try to read a Desfire card, nothing happens at all.

By the way, all my RC522 boards (at least 10) can read Mifare Ultralight cards so far.

Yes, i've ordered the same readers, around 3$ a pop?

I should first try it with sample C++ code with the arduino IDE, use this library: https://github.com/JPG-Consulting/rfid-desfire

If that doesn't work, your reader is just too weak to power the DesFire EV card, then you have some soldering to do. You can try 3 things:

• Use the link I previously posted to solder new 100uF capacitors on C8 & C9
• Check the Issues of the rfid-desfire library, there is someone with the same problem: https://github.com/JPG-Consulting/rfid-desfire/issues/2
  That guy states:
  
  If 3$ aliwxpress board (rc522) then u have to change inductors (L1, L2) to 2.2Uh w 200mA or more (feel free w 1A ) currency! Those one in china board has just 7mA currency, and Antenna has not enouth power to read DESFire or Ultralight C cards.
• Buy a better RC522 reader, which has more power: https://www.amazon.com/gp/product/B00E0ODLWQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Good luck, I don't know what I will do, because I really need DesFire EV2 to work

Hope this library helps.

kolbe said:

Hope this library helps.

Click to expand...

Hi, very nice library you've made. But the library you've ported works only with the older (and unsafe) Mifare Classic cards. Not DesFire EV1 or EV2 as far as I'm aware.

MathiasM said:

Hi, very nice library you've made. But the library you've ported works only with the older (and unsafe) Mifare Classic cards. Not DesFire EV1 or EV2 as far as I'm aware.

Click to expand...

Here's some info on that. Haven't tested any of that so not sure. I would guess you could use the send command method to do something.