Install Raspberry Pi
The xPL protocol is light enough to run on simple machines such as the Raspberry Pi.
Contents
[hide]Install Raspbian
Several distributions are available for the Raspberry Pi. This wiki bases on the console version of Raspbian.
Prepare an SD card
On a Linux computer, download it:
su cd /tmp wget https://downloads.raspberrypi.org/raspbian_lite_latest mv raspbian_lite_latest raspbian_lite.zip unzip raspbian_lite.zip mv *-raspbian-*-lite.img raspbian-lite.img
Insert a card reader with the SD card you wish to use and write the image:
fdisk -l RPI_DISK='/dev/sdb' umount $RPI_DISK* dd if=raspbian-lite.img of=$RPI_DISK
With GPartEd, add a 1 GB partition for the swap and format the rest of the card as ext4 for the user data.
Change root password
Insert the SD card in the Raspberry Pi and boot it.
sudo su passwd apt-get update
Swap space
Create a swap file:
dd if=/dev/zero of=/root/swapfile bs=1M count=1024 chmod 600 /root/swapfile mkswap /root/swapfile
Enable the swapfile:
swapon /root/swapfile swapon -s free -k
To enable at reboot, edit /etc/fstab:
/root/swapfile swap swap defaults 0 0
Locales
Install locales (for PERL and others):
su locale-gen en_US.UTF-8
Then edit ~.bashrc and add:
export LC_ALL=C
Ethernet
Check the Ethernet connection:
ifconfig | grep inet ping google.com
Connect to the BeagleBone via SSH to continue working (on a larger window).
ssh root@192.168.1.165
Change host name:
nano /etc/hosts change: "127.0.1.1 ubuntu-armhf" to: "127.0.1.1 beagleBoneHostname" nano /etc/hostname
Set up a bonjour discovery:
apt-get install avahi-daemon libnss-mdns
Give a static address:
nano /etc/network/interfaces iface eth0 inet static address 192.168.1.14 gateway 192.168.1.1 netmask 255.255.255.0 dns-nameservers 192.168.1.1 /etc/init.d/networking restart
Set-up Apple FileProtocol (AFP) sharing:
apt-get install netatalk nano /etc/netatalk/AppleVolumes.default
Command-line editing
Enable history search and bash tab autocompletion:
nano .bashrc nano /etc/inputrc apt-get update && apt-get install bash-completion
Install manuals:
apt-get install man-db
Programming tools
Install compilation tools (make, gcc, …):
apt-get install build-essential
Install Perl documentation reader:
apt-get install perl-doc
Local time
Set local time:
ls -lr /usr/share/zoneinfo/Europe/ rm /etc/localtime ln -s /usr/share/zoneinfo/Europe/Zurich /etc/localtime
Update time on a daily basis
with the help of the script /etc/cron.daily/ntpdate containing:
#!/bin/sh ntpdate ntp.ubuntu.com
Make the script executable:
chmod 755 /etc/cron.daily/ntpdate
Control user
Create user
Add the control user:
useradd -m -g users -G users,dialout,audio -s /bin/bash control passwd control
Checks
CPU usage
Check CPU usage:
ps -eo pcpu,user,args | sort -k 1 -r | head -10 echo && ps -eo pcpu,user,args | grep -v ' 0.0 ' | grep -v '%CPU' | sort -k 1 -r | sed 's/[ ^I]\/.*\/perl//' | sed 's/.pl[ ^I].*/.pl/'
Process priorities
Check process priorities:
ps ax -o nice,pid,user,args | grep -v ' NI ' | sort
The lowest numbers correspond to the highest priorities.
Change the priority level of xPL devices:
ps ax -o nice,pid,user,args | grep -v ' grep ' | grep -i xpl-
USER='control'
NEW_LEVEL=-10
SYSTEM_IFS=$IFS; IFS=$'\n';
task_list=(`ps ax -o pid,user,args | grep -v ' grep ' | grep -i '/xpl-'`)
IFS=$SYSTEM_IFS
for item in "${task_list[@]}" ; do
task_id=`echo "${item}" | sed "s/$USER.*//"`
# echo $task_id
renice $NEW_LEVEL -p $task_id >/dev/null
done
ps ax -o nice,pid,user,args | grep -v ' grep ' | grep -i xpl-
Upstart daemons
Check the status of init daemons:
initctl list initctl list | grep xpl-
Links
Here some interesting pages for the installation process:
