libnfc  1.8.0
nfc-dep-initiator.c
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1 /*-
2  * Free/Libre Near Field Communication (NFC) library
3  *
4  * Libnfc historical contributors:
5  * Copyright (C) 2009 Roel Verdult
6  * Copyright (C) 2009-2013 Romuald Conty
7  * Copyright (C) 2010-2012 Romain Tartière
8  * Copyright (C) 2010-2013 Philippe Teuwen
9  * Copyright (C) 2012-2013 Ludovic Rousseau
10  * See AUTHORS file for a more comprehensive list of contributors.
11  * Additional contributors of this file:
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions are met:
15  * 1) Redistributions of source code must retain the above copyright notice,
16  * this list of conditions and the following disclaimer.
17  * 2 )Redistributions in binary form must reproduce the above copyright
18  * notice, this list of conditions and the following disclaimer in the
19  * documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  *
33  * Note that this license only applies on the examples, NFC library itself is under LGPL
34  *
35  */
36 
42 #ifdef HAVE_CONFIG_H
43 # include "config.h"
44 #endif // HAVE_CONFIG_H
45 
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <signal.h>
50 
51 #include <nfc/nfc.h>
52 
53 #include "utils/nfc-utils.h"
54 
55 #define MAX_FRAME_LEN 264
56 
57 static nfc_device *pnd;
58 static nfc_context *context;
59 
60 static void stop_dep_communication(int sig)
61 {
62  (void) sig;
63  if (pnd != NULL) {
64  nfc_abort_command(pnd);
65  } else {
66  nfc_exit(context);
67  exit(EXIT_FAILURE);
68  }
69 }
70 
71 int
72 main(int argc, const char *argv[])
73 {
74  nfc_target nt;
75  uint8_t abtRx[MAX_FRAME_LEN];
76  uint8_t abtTx[] = "Hello World!";
77 
78  if (argc > 1) {
79  printf("Usage: %s\n", argv[0]);
80  exit(EXIT_FAILURE);
81  }
82 
83  nfc_init(&context);
84  if (context == NULL) {
85  ERR("Unable to init libnfc (malloc)");
86  exit(EXIT_FAILURE);
87  }
88 
89  pnd = nfc_open(context, NULL);
90  if (pnd == NULL) {
91  ERR("Unable to open NFC device.");
92  nfc_exit(context);
93  exit(EXIT_FAILURE);
94  }
95  printf("NFC device: %s\n opened", nfc_device_get_name(pnd));
96 
97  signal(SIGINT, stop_dep_communication);
98 
99  if (nfc_initiator_init(pnd) < 0) {
100  nfc_perror(pnd, "nfc_initiator_init");
101  nfc_close(pnd);
102  nfc_exit(context);
103  exit(EXIT_FAILURE);
104  }
105 
106  if (nfc_initiator_select_dep_target(pnd, NDM_PASSIVE, NBR_212, NULL, &nt, 1000) < 0) {
107  nfc_perror(pnd, "nfc_initiator_select_dep_target");
108  nfc_close(pnd);
109  nfc_exit(context);
110  exit(EXIT_FAILURE);
111  }
112  print_nfc_target(&nt, false);
113 
114  printf("Sending: %s\n", abtTx);
115  int res;
116  if ((res = nfc_initiator_transceive_bytes(pnd, abtTx, sizeof(abtTx), abtRx, sizeof(abtRx), 0)) < 0) {
117  nfc_perror(pnd, "nfc_initiator_transceive_bytes");
118  nfc_close(pnd);
119  nfc_exit(context);
120  exit(EXIT_FAILURE);
121  }
122 
123  abtRx[res] = 0;
124  printf("Received: %s\n", abtRx);
125 
126  if (nfc_initiator_deselect_target(pnd) < 0) {
127  nfc_perror(pnd, "nfc_initiator_deselect_target");
128  nfc_close(pnd);
129  nfc_exit(context);
130  exit(EXIT_FAILURE);
131  }
132 
133  nfc_close(pnd);
134  nfc_exit(context);
135  exit(EXIT_SUCCESS);
136 }
const char * nfc_device_get_name(nfc_device *pnd)
Returns the device name.
Definition: nfc.c:1209
void nfc_close(nfc_device *pnd)
Close from a NFC device.
Definition: nfc.c:339
nfc_device * nfc_open(nfc_context *context, const nfc_connstring connstring)
Open a NFC device.
Definition: nfc.c:277
int nfc_abort_command(nfc_device *pnd)
Abort current running command.
Definition: nfc.c:1036
void nfc_perror(const nfc_device *pnd, const char *pcString)
Display the last error occured on a nfc_device.
Definition: nfc.c:1183
int nfc_initiator_transceive_bytes(nfc_device *pnd, const uint8_t *pbtTx, const size_t szTx, uint8_t *pbtRx, const size_t szRx, int timeout)
Send data to target then retrieve data from target.
Definition: nfc.c:809
int nfc_initiator_init(nfc_device *pnd)
Initialize NFC device as initiator (reader)
Definition: nfc.c:493
int nfc_initiator_select_dep_target(nfc_device *pnd, const nfc_dep_mode ndm, const nfc_baud_rate nbr, const nfc_dep_info *pndiInitiator, nfc_target *pnt, const int timeout)
Select a target and request active or passive mode for D.E.P. (Data Exchange Protocol)
Definition: nfc.c:702
void nfc_exit(nfc_context *context)
Deinitialize libnfc. Should be called after closing all open devices and before your application term...
Definition: nfc.c:248
void nfc_init(nfc_context **context)
Initialize libnfc. This function must be called before calling any other libnfc function.
Definition: nfc.c:231
Provide some examples shared functions like print, parity calculation, options parsing.
#define ERR(...)
Print a error message.
Definition: nfc-utils.h:85
libnfc interface
NFC library context Struct which contains internal options, references, pointers, etc....
Definition: nfc-internal.h:175
NFC device information.
Definition: nfc-internal.h:190
NFC target structure.
Definition: nfc-types.h:351