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Minimal Cryptnox example: open a secure channel and fetch card info.

Minimal Cryptnox example: open a secure channel and fetch card info.Wiring & prerequisites:

• PN532 NFC reader on SPI, with SS on pin PN532_SS_PIN.
• A Cryptnox card initialised (the secure channel itself does not need a PIN, but the card must be programmed; use cryptnox init).

What the sketch does in each loop iteration:

1. Connect to the card and establish the secure channel (CryptnoxWallet::connect).
2. On success, ask the card for its info (CryptnoxWallet::getCardInfo).
3. Disconnect.

This sketch never submits a PIN, so it cannot lock the card. It is the safest starting point to validate that the wiring and the secure channel work end to end before moving to VerifyPin or Sign examples.

/*
 * SPDX-License-Identifier: LGPL-3.0-or-later
 * Copyright (c) 2026 Cryptnox SA
 */

#include <CryptnoxWallet.h>
#include <SPI.h>

#define PN532_SS_PIN  (10U)

ArduinoLoggerAdapter   serialAdapter;

PN532Adapter           nfc(serialAdapter, PN532_SS_PIN, &SPI);

ArduinoCryptoProvider  cryptoProvider;

ArduinoPlatform        platform;

CryptnoxWallet         wallet(nfc, serialAdapter, cryptoProvider, platform);

void setup() {
    serialAdapter.begin(115200);
    delay(1000);                              /* Arduino R4: wait for Serial */
    SPI.begin();
 
    if (!wallet.begin()) {
        serialAdapter.println(F("PN532 init failed"));
        while (1);
    }
 
    /* Concrete proof the PN532 is up: prints IC chip, firmware version
     * and supported NFC features (MIFARE / ISO-DEP / FeliCa). */
    nfc.printFirmwareVersion();
}

void loop() {
    CW_SecureSession session;
 
    if (wallet.connect(session)) {
        serialAdapter.println(F("Card connected, secure channel established"));
 
        CW_CardInfo info;
        if (wallet.getCardInfo(session, &info)) {
            serialAdapter.print(F("Owner name : "));
            serialAdapter.println(info.name);
            serialAdapter.print(F("Owner email: "));
            serialAdapter.println(info.email);
        } else {
            serialAdapter.println(F("getCardInfo failed (channel error or parse error)"));
        }
    } else {
        serialAdapter.println(F("Card not detected or secure channel failed"));
    }
 
    wallet.disconnect(session);
    delay(1000);
}