pn532 | PN532 NFC/RFID Native Python API for your Raspberry Pi

I’m in the process of writing a macOS application that will provide features to read and write data to nfc tags using the ACR122u usb reader. I’m having a difficult time finding examples of how to send commands to the device in this environment. I came across this question but can’t seem to adapt it to Swift or Objective C. Any help would be greatly appreciated.

Here's what I have so far but I can't seem to wrap my head around how to send an array of bytes.

I am trying to get an RFID-Reader (PN532) to work with a display, so it is shown there, who has scanned his RFID-Card. The problem I ran into was, that 2 pins (D7 HMOSI) and (D5 HSLCK) are used by both devices. Thus I simply put both connections on those. (wrong?)

Now when initializing either of both devices, the other one gets disabled.

I use Adafruit to initialize both devices.

In addition to this, the ESP8266 does not start when the RFID-Reader is connected. Removing the Pin from 3.3Volt VCC and waiting for init, then Adding the Pin, only then the RFID-Reader gets recognized and the ESP8266 runs. (bad case for crashes, as it would never reboot)

This is my cable setup:

Also here is my code:

So the problem I'm having is the following: I'm trying to emulate the EV2 Card on Android devices using the HCE service by the Android. I have a PN532 (Adafruit) board and a firmware is already installed on it and it uses DESfire native command set. So, processApduCommand() is never called because the command received by the phone is not in APDU format (ISO 7816 - 4). So how much of the native DESfire command set can I implement using the APDU protocol? How can I proceed from here? Thank you all in advance.

I'm writing C# application to emulate NFC tag via ACR122U, which uses PN532 internally. I want Android to read simple URI NDEF Tag.

I'm able to communicate with Android using NFC Forum Type 4 Tag protocol, Android detects the tag, but is not able to read the NDEF file - checked with NFC Tools app.

The communication looks like this:

Trying to read various payment cards using PN532 NFC RFID Module. libnfc6 sucessfully polls most of the nfc cards and even mobile payment method is detected, but none of my Revolut cards are detected by nfc-poll app.

libnfc was compiled locally from libnfc-1.8.0 git tag.

My current polling setup:

I currently have a Mifare RC522 module that I can use to successfully read/write to tags and cards, but I cannot successfully get it to read data that I am writing through an NFC phone app. Simply trying to get the RC522 module to read the data on the iPhone by bringing it close just brings up the Apple Pay menu. Is there something I am doing wrong? Does the data need to be encoded in a certain way or would that module just be useless and I'd probably need something like a PN532? I basically just want a module that can read NFC data I broadcast from an iPhone/Android device

I am trying to understand how a Mifare Ultralight Chip, I've got, works. This page pretty much explains it for normal circumstances: https://learn.adafruit.com/adafruit-pn532-rfid-nfc/ndef (At the very end of the page)

But now I have the problem that I want to write data on the chip that is bigger than 254 Byte. As an example, I am writing 493 'A's on it (With the 7 Byte Header, the Data will be 500 Byte overall). Here's what I get from reading the chip (the numbers are in decimal, not hex, so instead of '0xFF' it will say '255'):

I'm trying to understand the Mifare EEPROM memory structure. I found out this guide which was quite helpful. In below it covers the Memory block structure:

1K Cards - 16 sectors of 4 blocks each (sectors 0..15)

4K Cards - 32 sectors of 4 blocks each (sectors 0..31) and 8 sectors of 16 blocks each (sectors 32..39)

It covers only the classic series and I'm not sure if it is identical for the Desfire series Memory block structure.

Also, I want to use Desfire 8K cards and don't know how many 4blocks and 16blocks sectors it has. I tried to read the official datasheet but I couldn't understand this part.

I am building a Windows/Java program (using javax.smartcardio) to communicate with Jewel/Topaz512 tags (from Innovision/Broadcom) using an ACR122U device (with a PN532 NFC Controller chip inside).

I implemented the Topaz512 protocol (from this data sheet) but only half of my commands are working.

• Some commands that work: RID, RALL, READ, WRITE-NE, RSEG
• Some commands that don't work: WRITE-E, READ8, WRITE-E8, WRITE-NE8

For instance, here is what I get when I send a WRITE-NO-ERASE command:

Command: FF:00:00:00:0C:D4:40:01:1A:7F:42:38:01:9A:00:17:E8

Where:

• D4:40:01 is the InDataExchange command,
• 1A:7F:42 is the WRITE-NO-ERASE command (value: 0x42, block 0x0F, byte 7),
• 38:01:9A:00 is the 4-bytes tag UID,
• 17:E8 is the CRC.

Response: D5:41:00:42:90:00

Here the response is correct: 0x42. The status byte (0x00) informs that everything went well.

And here is what I get when I send a WRITE-WITH-ERASE command:

Command: FF:00:00:00:0C:D4:40:01:53:7F:42:38:01:9A:00:28:6E

Where:

• D4:40:01 is the InDataExchange command,
• 53:7F:42 is the WRITE-WITH-ERASE command (value: 0x42, block 0x0F, byte 7),
• 38:01:9A:00 is the 4-bytes tag UID,
• 28:6E is the CRC.

Response: D5:41:01:90:00

Here, the status byte (0x01) informs of a timeout detected by the PN532. (From the PN532 documentation (p67): "Time Out, the target has not answered - 0x01")

Also when I remove the PN532 timeouts (with FF:00:00:00:06:D4:32:02:00:00:00) non-working commands do not respond D5:41:01:90:00, but wait longer, then I get no response.

I just tried to execute the commands using gscriptor (from the pcsc-tools suite) and I got the same behavior. Here are my results:

The script: