ESP32 and NFC over I2C (NPC 基本測試)

 ESP32 and NFC over I2C

參考來源 https://warlord0blog.wordpress.com/2021/10/09/esp32-and-nfc-over-i2c/

PN532 要設定於I2C Mode  (SEL0 =ON , SEL1=OFF )

set the dip switches o nthe board to 1: ON, 2: OFF.

Libraries

 https://github.com/elechouse/PN532. 

~/Arduino/libraries
  ├── NDEF
  ├── PN532
  └── PN532_I2C

// esp32-wroom-32 devkit v1 default pins

//       SCL D22

//       SDA D21

// Define the interface type

#include <Wire.h>

#include <PN532_I2C.h>

#include <PN532.h>

#include <NfcAdapter.h>

PN532_I2C pn532i2c(Wire);

PN532 nfc(pn532i2c);

volatile bool connected = false;

void setup(void)

{

  Serial.begin(115200);

  Serial.println("*** Testing Module PN532 NFC RFID ***");

}

void loop(void)

{

  boolean success;

  // Buffer to store the UID

  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };

  // UID size (4 or 7 bytes depending on card type)

  uint8_t uidLength;

  while (!connected) {

    connected = connect();

  }

  // 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 the card is detected, print the UID

  if (success)

  {

    Serial.println("Card Detected");

    Serial.print("Size of UID: "); Serial.print(uidLength, DEC);

    Serial.println(" bytes");

    Serial.print("UID: ");

    for (uint8_t i = 0; i < uidLength; i++)

    {

      Serial.print(" 0x"); Serial.print(uid[i], HEX);

    }

    Serial.println("");

    Serial.println("");

   

    delay(1000);

    connected = connect();

  }

  else

  {

    // PN532 probably timed out waiting for a card

    // Serial.println("Timed out waiting for a card");

  }

}

bool connect() {

 

  nfc.begin();

  // Connected, show version

  uint32_t versiondata = nfc.getFirmwareVersion();

  if (! versiondata)

  {

    Serial.println("PN53x card not found!");

    return false;

  }

  //port

  Serial.print("Found chip PN5"); Serial.println((versiondata >> 24) & 0xFF, HEX);

  Serial.print("Firmware version: "); 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 card (ISO14443A Mifare)...");

  Serial.println("");

  return true;

}