ESP32 + PN532 NFC Reader I2C Mode

 ESP32 + PN532 NFC Reader  I2C Mode 

參考來源

http://www.elechouse.com/elechouse/images/product/PN532_module_V3/PN532_%20Manual_V3.pdf

https://www.taiwaniot.com.tw/product/pn532-nfc-rfid-v3-%E6%A8%A1%E7%B5%84-%E8%BF%91%E5%A0%B4%E9%80%9A%E8%A8%8A-%E6%94%AF%E6%8C%81-android-%E6%89%8B%E6%A9%9F%E9%80%9A%E8%A8%8A/

使用Library   https://github.com/elechouse/PN532

PN532 NFC RFID V3 模組 近場通訊 支持 Android 手機通訊

NFC又稱近距離無線通信，是一種短距離的高頻無線通信技術，允許電子設備之間進行非接觸式點對點數據傳輸（在十厘米內）交換數據。這個技術由免接觸式射頻識別（RFID）演變而來，並向下兼容RFID，最早由Sony和Philips各自開發成功，主要用於手機等手持設備中提供M2M(Machine to Machine)的通信。由於近場通訊具有天然的安全性，因此，NFC技術被認為在手機支付等領域具有很大的應用前景。

利用NXP532的幾乎所有管腳都，因此用戶可以輕鬆的調試和把玩。該進場通訊模組默認才用I2C作為數據接埠

• 支援I2C、SPI、HSU(高速UART)，可以很容易在這些通訊方式之間進行切換，通過板子左下角的撥動開關即可輕鬆實現通訊方式的切換
• Work in NFC Mode or RFID reader/writer Mode（可工作在NFC狀態、RFID讀或者寫狀態）
• RFID reader/writer supports: （RDID讀寫支援）
  Mifare 1k, 4k, Ultralight, 和DesFire 卡
  ISO/IEC 14443-4 cards，如CD97BX, CD light, Desfire, P5CN072 (SMX)
  Innovision Jewel cards，如IRT5001 card
  FeliCa cards ，如RCS_860 和RCS_854
• 即插即用,相容Arduino
• 板內天線, 支援 1cm-5ccm 通訊距離
• On-board level shifter, 標準5V TTL for I2C and UART, 3.3V TTL for SPI
• 可工作在 RFID 讀/寫模式
• 可工作在 1443-A card 或者 虛擬card模式
• 可與其他NFC設備交換數據，如Android手機
• Interface 數據埠 I2C 是默認數據埠. 用戶也可根據自己需要利用引出的管腳改變數據傳輸方式，如串埠，SPI等
• 
  

Connecting an I2C device to an ESP32 is normally as simple as connecting GND to GND, SDA to SDA, SCL to SCL and a positive power supply to a peripheral, usually 3.3V (but it depends on the module you’re using).

I2C Device	ESP32
SDA	SDA (default is GPIO 21)
SCL	SCL (default is GPIO 22)
GND	GND
VCC	usually 3.3V or 5V

使用Library   https://github.com/elechouse/PN532

解壓縮後存入 目錄 C:\Users\alex\Documents\Arduino\libraries

將其他MODE 刪除掉 保留I2C Mode

支持I2C .SPI  和HSU（高速UART）

I2C --> Wire,h

SPI --> SPI.h 

HSU (High Speed UART) -->PN532_HSU.h

 

// SDA  SDA (default is GPIO 21) ESP32

// SCL SCL (default is GPIO 22)

/* it will be switch to I2C Mode*/

#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!");

  Serial.println("SDA (default is GPIO 21) SCL (default is GPIO 22)");

  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");

  }

}