Short initialization example

Using the NFC controller in the Arduino environment is very simple and here’s a short introduction on how to go about it.

First you need to install the driver library required for the NFC chip. This driver library is called “Electronic Cats PN7150” and you can search for it in the Arduino IDE library manager by simply typing “PN7150” in the search field. It will be the only library that comes up.

After you have installed this library you can take a look at the examples below to get started.

First we need to create an instance of the driver that your program can use to talk to the NFC controller.

#include "Electroniccats_PN7150.h"

// creates a global NFC device interface object
Electroniccats_PN7150 nfc(PIN_PN7150_IRQ_B, PIN_PN7150_RST_B, PN7150_I2C_ADDR, &Wire1);

Then, in the setup function we need to perform a series of different setup steps:

  Serial.println("Detect NFC tags with PN7150");

  Serial.println("Initializing..."); 
  if (nfc.connectNCI()) { //Wake up the board
    Serial.println("Error while setting up the mode, check connections!");
    while (1);
  }

  if (nfc.ConfigureSettings()) {
    Serial.println("The Configure Settings is failed!");
    while (1);
  }

  if(nfc.ConfigMode(mode)){ //Set up the configuration mode
    Serial.println("The Configure Mode is failed!!");
    while (1);
  }

  Serial.println("Initialization succeeded !");
  if (nfc.StartDiscovery(mode) == SUCCESS) {
    Serial.println("Successfully started discovery mode !");
  } else {
    Serial.println("Failed to start discovery mode !");
    while(1);
  }

After these steps we are ready to start looking for NFC tags coming in close:

  if(!nfc.WaitForDiscoveryNotification(&RfInterface)) {
    switch(RfInterface.Protocol) {
      case PROT_T1T:
      case PROT_T2T:
      case PROT_T3T:
      case PROT_ISODEP:
        nfc.ProcessReaderMode(RfInterface, READ_NDEF);
        break;

     case PROT_ISO15693:
       break;

     case PROT_MIFARE:
       nfc.ProcessReaderMode(RfInterface, READ_NDEF);
       break;

     default:
       break;
    }

    //* It can detect multiple cards at the same time if they use the same protocol 
    if(RfInterface.MoreTags) {
      nfc.ReaderActivateNext(&RfInterface);
    }

    //* Wait for card removal 
    nfc.ProcessReaderMode(RfInterface, PRESENCE_CHECK);

    nfc.StopDiscovery();
    nfc.StartDiscovery(mode);
  }
  nfc.ConfigMode(mode);
  nfc.StartDiscovery(mode);

Also make sure to check out the complete example in the examples section of this website.