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
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??