Raspberry Pi

Links

• Raspberry Pi on Wikipedia
• Raspbian on Wikipedia
• http://www.raspberrypi.org/
• http://www.raspbian.org/
• http://elinux.org/RaspberryPiBoard
• http://www.element14.com/community/groups/raspberry-pi
• http://elinux.org/RPi_VerifiedPeripherals

Hardware:

• http://elinux.org/RPi_Low-level_peripherals
• http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
• http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf

Startup

Remotely: provide DHCP over Ethernet
Access via ssh, Username: pi Password: raspberry
First time, the device propose to run raspi-config

sudo raspi-config

Then, better to renew SSH server keys, see RPi remote access

sudo rm /etc/ssh/ssh_host_* && sudo dpkg-reconfigure openssh-server

sudo apt-get update

Wi-Fi

Using Wi-Pi
See user manual for Raspbian.
Edit /etc/network/interfaces and add wlan0 section similar to:

auto wlan0
iface wlan0 inet dhcp
wpa-ssid <name of your WiFi network>
wpa-psk <password of your WiFi network>

Then

sudo /etc/init.d/networking restart

NFC

apt-get install git autoconf libtool gcc libusb-dev
apt-get install dpkg-dev debhelper dh-autoreconf
git clone https://code.google.com/p/libnfc/
cd libnfc
dpkg-buildpackage -b -uc -us
cd ..
dpkg -i *deb

For a SCL3711:

modprobe -r pn533
echo blacklist pn533 > /etc/modprobe.d/pn533-blacklist.conf

GPIO

RPi-GPIO is already pre-installed on Raspbian

dpkg -l|grep gpio
ii  python-rpi.gpio                       0.4.1a-1                   armhf        Python GPIO module for Raspberry Pi
ii  python3-rpi.gpio                      0.4.1a-1                   armhf        Python 3 GPIO module for Raspberry Pi

Usage: https://code.google.com/p/raspberry-gpio-python/wiki/BasicUsage

Refs:

• http://elinux.org/RPi_BCM2835_GPIOs
• http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29

SPI

See http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29 for pinout

Enable

Edit /etc/modprobe.d/raspi-blacklist.conf and comment:

#blacklist spi-bcm2708

Reboot
There should now be some /dev/spi*

$ ls /dev/spi*
/dev/spidev0.0 /dev/spidev0.1

Test

wget "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob_plain;f=Documentation/spi/spidev_test.c" -O spidev_test.c
gcc -o spidev_test spidev_test.c
sudo ./spidev_test -D /dev/spidev0.0

We should get a bunch of zeroes.
Now, be very careful!!
Shortcut GPIO9(MISO)(pin21) and GPIO10(MOSI)(pin19).
Check on a pinout diagram first...
And run again the command, now we should get some hex dump about dead beef and bad food ;-)

sudo ./spidev_test -D /dev/spidev0.0

If test fails, see here for updating stuffs:

• http://www.brianhensley.net/2012/07/getting-spi-working-on-raspberry-pi.html
• see also SPI pinout example with an Arduino

SPI-Python

• http://louisthiery.com/spi-python-hardware-spi-for-raspi/
• https://github.com/lthiery/SPI-Py

Warning: at time of writing, functions described in the wiki didn't match code anymore.

wget https://raw.github.com/lthiery/SPI-Py/master/spi.c
wget https://raw.github.com/lthiery/SPI-Py/master/setup.py
apt-get install python2.7-dev
python setup.py build

Result spi.so is in build/lib.linux-armv6l-2.7/spi.so to be dropped in python path

SPI-NFC

tests...

max speed achieved with debug on: 7.8MHz (PN532 spec says 5MHz)

LIBNFC_DEFAULT_DEVICE=pn532_spi:/dev/spidev0.0:7800000 LIBNFC_LOG_LEVEL=3 utils/nfc-list

max speed achieved without debug: 480kHz

LIBNFC_DEFAULT_DEVICE=pn532_spi:/dev/spidev0.0:480000 LIBNFC_LOG_LEVEL=2 utils/nfc-list

Raspdancer

See Raspdancer

Untested

modprobe spidev??