I'm absoloutly lost about esp32 emulating tag with pn532, help

[Edward1Stark]

I'vr tried everything possible so much that I don't even know where the problem is from. if anyone has done the emulation with pn532 and esp32 I would really appriciate you tell/send/show me these infos:

1. type of connection you have used (spi,i2c,hsu)
2. pinout that you have used
3. CODE THAT YOU HAVE USED!
4. library that yiu have used

thank you very much, I've nearly been trying 4 days just to emulate a tag detectable with my phone or a link that be detect able with my phone

[baorepo]

@Edward1Stark The specific operational steps are as follows:

1. Hardware connection (SPI mode):

ESP32     PN532
GPIO23   -> MOSI
GPIO19   <- MISO 
GPIO18   -> SCK
GPIO5    -> SSEL
3.3V     -> VCC
GND      -> GND

2. Basic function verification code:

#include <PN532_SPI.h>
#include <PN532.h>

PN532_SPI pn532spi(SPI, 5); // SS pin GPIO5
PN532 nfc(pn532spi);

void setup() {
  Serial.begin(115200);
  nfc.begin();

uint32_t versiondata = nfc.getFirmwareVersion();
  if (!versiondata) {
    Serial.println("No PN532 chip detected");
    while(1);
}

  Serial.print("Chip version: ");
  Serial.println(versiondata, HEX);

  nfc.SAMConfig();
Serial.println("Waiting for NFC device to approach...");
}

void loop() {
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };
uint8_t uidLength;

  if (nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength)) {
    Serial.println("NFC card detected");
    // Add card data processing code here
delay(1000);
  }
}

3. Verification Steps:

• First, upload this basic code
• Open the serial monitor (115200 baud rate)
• Bring a phone or other NFC card close to the module
• Verify whether the device version number can be correctly detected
• Test whether the card reading function is working properly

If the basic functionality verification passes, you can then develop the tag emulation feature on this foundation. If specific issues arise, you can provide the serial output logs for further analysis.

[Edward1Stark]

Dear @baorepo before I start I want to thank you for helping me, it truly means a lot to me. So i tried to upload your code on my esp32 wroom with the latest version of seed-studio pn532 installed on my Arduino IDE, but I received this error while uploading the code:

c:/users/asus/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32-elf-gcc/esp-12.2.0_20230208/bin/../lib/gcc/xtensa-esp32-elf/12.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Asus\AppData\Local\Temp\arduino\sketches\25F8619E7838CA1240301B358CDEA5A5\sketch\sketch_dec2a.ino.cpp.o:(.literal.startup._GLOBAL__sub_I_pn532spi+0x8): undefined reference to PN532_SPI::PN532_SPI(SPIClass&, unsigned char)'
c:/users/asus/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32-elf-gcc/esp-12.2.0_20230208/bin/../lib/gcc/xtensa-esp32-elf/12.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Asus\AppData\Local\Temp\arduino\sketches\25F8619E7838CA1240301B358CDEA5A5\sketch\sketch_dec2a.ino.cpp.o: in function _GLOBAL__sub_I_pn532spi': C:\Users\Asus\AppData\Local\Temp.arduinoIDE-unsaved2025112-6224-1xxs7qm.o6gt\sketch_dec2a/sketch_dec2a.ino:4: undefined reference to PN532_SPI::PN532_SPI(SPIClass&, unsigned char)'
collect2.exe: error: ld returned 1 exit status

exit status 1

Compilation error: exit status 1`

[Edward1Stark]

@baorepo I think I mistakenly closed the issue, my bad it is my first time writing an issue on GitHub, can we continue it here or should i open another issue?

[baorepo]

@Edward1Stark Based on the compilation errors you encountered, it's recommended to provide the following information for further troubleshooting:

1. Complete Arduino IDE environment details:

• Arduino IDE version number
• ESP32 board support package version in use (can be checked under "Tools > Board > Boards Manager")

2. Details of the installed PN532 library:

• Whether it was installed via the Library Manager or manually
• The specific version number of the library

3. Board configuration:

• Verify the correct ESP32 development board model is selected in the "Tools" menu.
• Other relevant settings (such as Flash Mode, etc.)

This error typically occurs due to incomplete library file references. Try the following steps:

1. Completely uninstall the existing PN532 library.
2. Reinstall the latest version of the PN532 library via Arduino Library Manager
3. Ensure all dependency libraries are installed

If the issue persists, please provide the complete error log along with the above environment details to help identify the root cause more easily.

[Edward1Stark]

@baorepo

Arduino IDE version: 2.3.3

ESP32 board versions installed in Board Manager:
ARDUINO ESP32 BOARDS by Arduino — v2.0.18
esp32 by Espressif Systems — v3.0.0

I installed the PN532 library by downloading the original ZIP file from Seeed Studio’s official PN532 GitHub repository, then added it through Sketch → Include Library → Add .ZIP Library.

Why did I do it this way instead of using the Library Manager?
Because when I search for “PN532” in the Library Manager, the Seeed Studio version doesn’t appear. Only the Adafruit library and a few unrelated versions show up.

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