I’d like to be able to change the URL of the RSS feed using NFC (~RFID). This is a tiny bit of over-engineering, but could also be very cool. I have a couple of NFC boards I’ve been planning on playing with for a while.
One’s an NFC Adafruit shield for the Arduino. I thought it was a breakout board as in the instructions, and it’s a bit annoying that it isn’t, as I think I’ll have to have an arduino in the mix with the breakout board, and it won’t really fit in the box with all that stuff (plus I’ll need a chunky power supply). And it’s not the one in the instructions so it won’t be super-easy.
So I’m thinking I’ll try the other, which is a Raspberry Pi NFC shield. Unfortunately the code is binary…which I’m not keen on running without knowing what it is. Fortunately, it’s libnfc-compatible, which is why I bought it.
So I think:
-
attach the NFC shield -
compile libnfc - try libnfc example
- add to the radiodan code
Attach the NFC shield
A nice easy one first. Because mine’s a B+ I think I’ll have room to add some buttons and things to the GPIO later – it covers all the B’s GPIO ports, so I’ve removed by button cables for now.
I switched the Pi off first and then rebooted it. It seems happy enough and I can ssh in.
Compile libnfc
There are some instructions for compiling libNFC on the Adafruit site.
In a browser, go to
https://code.google.com/p/libnfc/source/browse/?name=libnfc-1.7.0
download zip
scp zip to the pi
cd Downloads
zip -r libnfc-libnfc-1.7.0.zip libnfc-libnfc-1.7.0
scp libnfc-libnfc-1.7.0.zip pi@radiodan-libby.local:
on the pi
mkdir libnfc
cd libnfc
mv ~/libnfc-libnfc-1.7.0.zip .
unzip libnfc-libnfc-1.7.0.zip
cd libnfc-libnfc-1.7.0/
sudo mkdir /etc/nfc
sudo mkdir /etc/nfc/devices.d
sudo cp contrib/libnfc/pn532_uart_on_rpi.conf.sample /etc/nfc/devices.d/pn532_uart_on_rpi.conf
sudo nano /etc/nfc/devices.d/pn532_uart_on_rpi.conf
add to the bottom: allow_intrusive_scan = true
./configure --with-drivers=pn532_uart --sysconfdir=/etc --prefix=/usr
-bash: ./configure: No such file or directory
sudo apt-get update
sudo apt-get install autoconf
autoreconf -vis
libnfc/Makefile.am:6: error: Libtool library used but 'LIBTOOL' is undefined
libnfc/Makefile.am:6: The usual way to define 'LIBTOOL' is to add 'LT_INIT'
libnfc/Makefile.am:6: to 'configure.ac' and run 'aclocal' and 'autoconf' again.
...
but configure does exist. hm
then
./configure --with-drivers=pn532_uart --sysconfdir=/etc --prefix=/usr
…fails
these instructions look better.
sudo apt-get install libusb-dev libpcsclite-dev libextutils-pkgconfig-perl
git clone https://code.google.com/p/libnfc/
cd libnfc
git checkout libnfc-1.7.1
git clean -d -f -x
git remote|grep -q anonscm||git remote add anonscm git://anonscm.debian.org/collab-maint/libnfc.git
git fetch anonscm
git reset
dpkg-buildpackage -uc -us -b
dpkg-checkbuilddeps: Unmet build dependencies: debhelper (>= 9) dh-autoreconf libtool
dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
dpkg-buildpackage: warning: (Use -d flag to override.)
sudo apt-get install debhelper dh-autoreconf libtool
dpkg-buildpackage -uc -us -b
....
error
Thread model: posix
gcc version 4.6.3 (Debian 4.6.3-14+rpi1)
configure:3495: $? = 0
configure:3484: gcc -V >&5
gcc: error: unrecognized option '-V'
gcc: fatal error: no input files
compilation terminated.
configure:3495: $? = 4
configure:3484: gcc -qversion >&5
gcc: error: unrecognized option '-qversion'
gcc: fatal error: no input files
compilation terminated.
configure:3495: $? = 4
configure:3515: checking whether the C compiler works
configure:3537: gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-z,relro conftest.c >&5
cc1: error: unrecognized command line option '-fstack-protector-strong'
configure:3541: $? = 1
configure:3579: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "libnfc"
...
Let’s try this again – don’t really need a deb package
./configure --with-drivers=pn532_uart --sysconfdir=/etc --prefix=/usr
appears to work
sudo apt-get install libusb-0.1-4 libpcsclite1 libccid pcscd
seems happy
sudo make clean
sudo make install all
Plug in NFC device, place a tag on it and test your installation
nfc-list
error libnfc.driver.pn532_uart Invalid serial port: /dev/ttyAMA0
hm. From earlier
Selected drivers:
acr122_pcsc...... no
acr122_usb....... no
acr122s.......... no
arygon........... no
pn53x_usb........ no
pn532_uart....... yes
pn532_spi....... no
pn532_i2c........ no
I tried this to free up the uart.
– and then on reboot I think the disk has become corrupt. Dammit.
Andrew’s got a better plan anyway, talking to it through the serial port.
—-
Starting again with a clean install of raspian
sudo apt-get install libusb-dev libpcsclite-dev libextutils-pkgconfig-perl
git clone https://code.google.com/p/libnfc/
cd libnfc
git checkout libnfc-1.7.1
git clean -d -f -x
git remote|grep -q anonscm||git remote add anonscm git://anonscm.debian.org/collab-maint/libnfc.git
git fetch anonscm
git reset
now, without the RFID shield plugged in, free up the UART.
sudo apt-get install debhelper dh-autoreconf libtool
sudo mkdir /etc/nfc
sudo mkdir /etc/nfc/devices.d
sudo cp contrib/libnfc/pn532_uart_on_rpi.conf.sample /etc/nfc/devices.d/pn532_uart_on_rpi.conf
sudo nano /etc/nfc/devices.d/pn532_uart_on_rpi.conf
allow_intrusive_scan = true
autoreconf -vis
./configure –with-drivers=pn532_uart –sysconfdir=/etc –prefix=/usr
sudo make clean
sudo make install all
disable serial comms in raspi-config
shut down
add the shield
start up
pi@raspberrypi ~ $ nfc-list
nfc-list uses libnfc libnfc-1.7.1
error libnfc.driver.pn532_uart pn53x_check_communication error
nfc-list: ERROR: Unable to open NFC device: pn532_uart:/dev/ttyAMA0
shut down, remove shield, restart
https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/freeing-uart-on-the-pi (the latter was done already)
[repeated goes]
from
sudo nano /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
->
dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
sudo halt
reattach shield
restart
stil same error, although it is detecting the card. I think maybe I’m using the wrong driver.
http://www.libnfc.org/community/topic/1245/nxp-explorenfc-with-libnfc/
hm.
http://www.element14.com/community/thread/36517/l/explore-nfc-with-libnfc
“The EXPLORE-NFC is not supported by the libnfc. The information in the product description is wrong. This board is supported by the NXP NFC Reader Library. The sources are available for download at [1].”
BAH.
I later got it working with this: https://github.com/svvitale/nxppy
print "Imported NXPPY"
reader = nxppy.Mifare()
print "Loaded mifare device"
currentId = None
while True:
try:
uid = reader.select()
if(currentId == None or currentId!=uid):
currentId = uid
print "New card ID:" + currentId
except:
pass
PlanB 