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(The libnfc.conf file goes in /etc/nfc, not /etc/nfc/devices.d)
m (Prepare Libnfc)
Line 5: Line 5:
<source lang=bash>
<source lang=bash>
git clone
git clone
cd libnfc
cd libnfc
git checkout libnfc-1.7.1
git checkout libnfc-1.7.1

Latest revision as of 09:24, 6 January 2017

How to use a PN532 board with Arduino to make a reader compatible with libnfc


[edit] Prepare Libnfc

Download libnfc 1.7.1

git clone
cd libnfc
git checkout libnfc-1.7.1

Download this patch:

--- libnfc/drivers/pn532_uart.c	(unpatched)
+++ libnfc/drivers/pn532_uart.c	(patched)
@@ -48,7 +48,7 @@
 #include "chips/pn53x-internal.h"
 #include "uart.h"
-#define PN532_UART_DEFAULT_SPEED 115200
+#define PN532_UART_DEFAULT_SPEED 230400
 #define PN532_UART_DRIVER_NAME "pn532_uart"
 #define LOG_CATEGORY "libnfc.driver.pn532_uart"
@@ -306,6 +306,7 @@ pn532_uart_wakeup(nfc_device *pnd)
   const uint8_t pn532_wakeup_preamble[] = { 0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
   int res = uart_send(DRIVER_DATA(pnd)->port, pn532_wakeup_preamble, sizeof(pn532_wakeup_preamble), 0);
   CHIP_DATA(pnd)->power_mode = NORMAL; // PN532 should now be awake
+  sleep(4);
   return res;

This can be done with

wget --content-disposition ""

Then apply it:

patch -p0 < pn532_uart.patch

Compile with pn532_uart driver (or all drivers if you remove "--with-drivers=..."):

autoreconf -vis
./configure --with-drivers=pn532_uart --sysconfdir=/etc --prefix=/usr
make clean all

and install it on your system:

sudo make install

(if libnfc was installed before, it should be deleted before installing it)

Set configuration by creating /etc/nfc/libnfc.conf as

# Allow device auto-detection (default: true)
# Note: if this auto-detection is disabled, user has to set manually a device
# configuration using file or environment variable
allow_autoscan = false
# Allow intrusive auto-detection (default: false)
# Warning: intrusive auto-detection can seriously disturb other devices
# This option is not recommended, user should prefer to add manually his device.
allow_intrusive_scan = false
# Set log level (default: error)
# Valid log levels are (in order of verbosity): 0 (none), 1 (error), 2 (info), 3 (debug)
# Note: if you compiled with --enable-debug option, the default log level is "debug"
log_level = 2
# Manually set default device (no default)
# To set a default device, you must set both name and connstring for your device
# Note: if autoscan is enabled, default device will be the first device available in device list. = "PN532 NFC Board on Arduino"
device.connstring = "pn532_uart:/dev/ttyACM0:230400"

sudo mkdir -p /etc/nfc/devices.d
cd /etc/nfc/
wget --content-disposition ""

All above steps are available in this script

Check if /dev/ttyACM0 is well your Arduino port, else adapt this script.

[edit] Prepare Arduino


svn checkout uartnfc
cd uartnfc

now you have the lib and the sketch for your arduino :)

Change baudrate in the uartnfc.ino file to 230400:

void setup(void)
  Serial.begin(230400); //115200, 230400(, 460800, 921600)

Upload the sketch to the Arduino, e.g. via the Arduino IDE.

[edit] Prepare hardware

Check if your PN532 board needs some soldering to activate the SPI, then wire it to the Arduino as following:

 Arduino       PN532 board (SPI)
 Pin 13  <-->  SCK
 Pin 12  <-->  MISO
 Pin 11  <-->  MOSI (/SDA/TX)
 Pin 10  <-->  SS   (/NSS/SCL/RX)
 GND     <-->  GND
 3,3V    <-->  3,3V (VCC)

[edit] Test

root@kali:~# nfc-list
nfc-list uses libnfc libnfc-1.7.0-91-g491db20
NFC device: pn532_uart:/dev/ttyACM0 opened
1 ISO14443A passive target(s) found:
ISO/IEC 14443A (106 kbps) target:
    ATQA (SENS_RES): 00  04  
       UID (NFCID1): a5  09  fd  e5  
      SAK (SEL_RES): 08  

[edit] Links

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