libnfc/examples/nfc-poll.c

/*-
 * Public platform independent Near Field Communication (NFC) library
 * 
 * Copyright (C) 2010, Romuald Conty
 * 
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * @file nfc-poll
 * @brief Polling example
 */

#ifdef HAVE_CONFIG_H
  #include "config.h"
#endif // HAVE_CONFIG_H

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#include <nfc/nfc.h>
#include <nfc/nfc-types.h>
#include <nfc/nfc-messages.h>
#include "bitutils.h"
#include "nfc-utils.h"

#define MAX_DEVICE_COUNT 16

static nfc_device_t* pnd;

int main(int argc, const char* argv[])
{
  size_t szFound;
  size_t i;
  nfc_target_info_t nti;
  nfc_device_desc_t *pnddDevices;

  // Display libnfc version
  const char* acLibnfcVersion = nfc_version();
  printf("%s use libnfc %s\n", argv[0], acLibnfcVersion);

  if (!(pnddDevices = malloc (MAX_DEVICE_COUNT * sizeof (*pnddDevices))))
  {
    fprintf (stderr, "malloc() failed\n");
    return EXIT_FAILURE;
  }

  nfc_list_devices (pnddDevices, MAX_DEVICE_COUNT, &szFound);

  if (szFound == 0)
  {
    INFO("%s", "No device found.");
  }

  for (i = 0; i < szFound; i++)
  {
    pnd = nfc_connect(&(pnddDevices[i]));


    if (pnd == NULL)
    {
      ERR("%s", "Unable to connect to NFC device.");
      return 1;
    }
    nfc_initiator_init(pnd);

    // Drop the field for a while
    nfc_configure(pnd,NDO_ACTIVATE_FIELD,false);

    // Let the reader only try once to find a tag
    nfc_configure(pnd,NDO_INFINITE_SELECT,false);

    // Configure the CRC and Parity settings
    nfc_configure(pnd,NDO_HANDLE_CRC,true);
    nfc_configure(pnd,NDO_HANDLE_PARITY,true);

    // Enable field so more power consuming cards can power themselves up
    nfc_configure(pnd,NDO_ACTIVATE_FIELD,true);

    printf("Connected to NFC reader: %s\n",pnd->acName);

// NOTE we can't use pn53x_transceive() because rx[0] is not status byte (0x00 != status OK)
// bool pn53x_transceive(const nfc_device_t* pnd, const byte_t* pbtTx, const size_t szTxLen, byte_t* pbtRx, size_t* pszRxLen);
//    bool res = pn53x_transceive(pnd, abtTx, szTxLen, abtRx, &szRxLen);
    
// bool (*transceive)(const nfc_device_spec_t nds, const byte_t* pbtTx, const size_t szTxLen, byte_t* pbtRx, size_t* pszRxLen);

    const byte_t btPollNr = 0x0a;
    const byte_t btPeriod = 0x01;
    const nfc_target_type_t nttMifare = NTT_MIFARE;
    const size_t szTargetTypes = 1;

    nfc_target_t antTargets[2];
    size_t szTargetFound;

    printf("PN53x will poll during %d ms\n", btPollNr * szTargetTypes * btPeriod * 150);
    bool res = nfc_initiator_poll_targets(pnd, &nttMifare, 1, btPollNr, btPeriod, antTargets, &szTargetFound);
    if( res ) {
      printf("%d target(s) have been found.\n", szTargetFound);
      for(uint8_t n=0; n<szTargetFound; n++) {
	printf("T%d: targetType=%02x, ", n+1, antTargets[n].ntt);
	printf("targetData:\n"); print_nfc_iso14443a_info(antTargets[n].nti.nai);
      }
    } else {
      ERR("%s", "Polling failed.");
    }

    nfc_disconnect(pnd);
    }

  free (pnddDevices);
  return 0;
}