Add new example to show how to use new polling function.

examples/Makefile.am

@@ -1,4 +1,4 @@
-bin_PROGRAMS = nfc-anticol nfc-list nfc-mfclassic nfc-mfultralight nfc-relay nfc-emulate nfcip-target nfcip-initiator
+bin_PROGRAMS = nfc-anticol nfc-list nfc-mfclassic nfc-mfultralight nfc-relay nfc-emulate nfcip-target nfcip-initiator nfc-poll
 
 # set the include path found by configure
 INCLUDES= $(all_includes) $(LIBNFC_CFLAGS)
@@ -8,6 +8,9 @@ nfcincludedir = $(includedir)/nfc
 
 AM_CFLAGS = -I$(top_srcdir)/libnfc
 
+nfc_poll_SOURCES = nfc-poll.c
+nfc_poll_LDADD = $(top_builddir)/libnfc/libnfc.la
+
 nfc_anticol_SOURCES = nfc-anticol.c
 nfc_anticol_LDADD = $(top_builddir)/libnfc/libnfc.la
 

examples/nfc-poll.c

@@ -0,0 +1,126 @@
+/*-
+ * 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"
+
+#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;
+}
+