CODEWITHSUNDEEP
nfci2cesp32
Okiic.
Okiic.

Reputation: 117

ESP32 failing to detect PN532 NFC module

I've been struggling for the past few days to get the Elechouse PN532 V3 module working with an ESP32 over I2C. The PN532 module itself works fine with a Raspberry Pi.

This is the circuit (not actually using SparkFun ESP32 board, just for reference) ESP32 circuit

And this is the code I'm trying to run

#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_I2C pn532i2c(Wire);
PN532 nfc(pn532i2c);

void setup(void) {
  Serial.begin(115200);
  Serial.println("Hello!");

  Wire.begin(18, 19);
  nfc.begin();

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }

  // Got ok data, print it out!
  Serial.print("Found chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX); 
  Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC); 
  Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);

  // Set the max number of retry attempts to read from a card
  // This prevents us from waiting forever for a card, which is
  // the default behaviour of the PN532.
  nfc.setPassiveActivationRetries(0xFF);

  // configure board to read RFID tags
  nfc.SAMConfig();

  Serial.println("Waiting for an ISO14443A card");
}

void loop(void) {
  boolean success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID
  uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)

  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength);

  if (success) {
    Serial.println("Found a card!");
    Serial.print("UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
    Serial.print("UID Value: ");
    for (uint8_t i=0; i < uidLength; i++) 
    {
      Serial.print(" 0x");Serial.print(uid[i], HEX); 
    }
    Serial.println("");
    // Wait 1 second before continuing
    delay(1000);
  }
  else
  {
    // PN532 probably timed out waiting for a card
    Serial.println("Timed out waiting for a card");
  }
}

And finally the serial output: Didn't find PN53X board
Any ideas what I'm doing wrong?

EDIT: libraries im using https://github.com/elechouse/PN532 and the ESP32 dev board is a Wemos Lolin32 Lite clone.

Upvotes: 1

Views: 8185

Answers (3)

bedford electronics
bedford electronics

Reputation: 11

I have this now working with an M5STACK grey core, the common issue was the I2C bus would lock up on a reset or re program. Use a spare I/O pin and connect to the PN532 reset pin, hold this low on boot, initialize I2C bus then drive reset high after 100mS problem solved no more bus conflicts.

Upvotes: 1

BorisT
BorisT

Reputation: 138

sda and scl are 21 and 22 also make sure that you changed mode to I2C (those jumpers on PN532 module): doc - page 3

Upvotes: 0

gOnZo
gOnZo

Reputation: 489

I don't have any of this hardware to verify this, but from 'PN532-PN532_HSU\NDEF\README.md'

For the Adafruit Shield using I2C 

    #include <Wire.h>
    #include <PN532_I2C.h>
    #include <PN532.h>
    #include <NfcAdapter.h>

    PN532_I2C pn532_i2c(Wire);
    NfcAdapter nfc = NfcAdapter(pn532_i2c);

Try using the above in your code? I'd also suggest you review the PN532 I2C examples in more depth. The PN532 I2C library code defines a 'wakeup' function:

void PN532_I2C::wakeup()
{
    delay(500); // wait for all ready to manipulate pn532
}

The comment makes me believe the device may require a significant delay (500ms) before it's ready to talk.

Best of luck.

Upvotes: 0

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