In this page we are collecting our first experiments with the graphical environment X.org
To simply test the framebuffer before install anything try this command:
~# cat /dev/urandom > /dev/fb0
You should see a random pattern of colors on the display.
To install X.org on your Acme board simply type:
~# apt-get update ~# apt-get -y install xorg
Now you can run it from the DPI port or a SSH session by typing:
~# FRAMEBUFFER=/dev/fb0 startx &
The console prompt on the display will change and the mouse point will appear. If you connect an USB port and a mouse you can proceede like a small Linux PC (without the windows manager).
I don't suggest to install any windows manager like KDE or GNOME because you don't have enough power to manage it and the user experience is the poor.
The first thind to do during the test is to disable the screen saver by typing:
~# DISPLAY=":0" xset s off
Now lets try some simple program just to see something on the scree.
A simple calculator:
~# DISPLAY=":0" xcalc ~# xeyes
Type CTRL-C to exit.
Now plug a mouse and try:
~# DISPLAY=":0" xeyes
Type CTRL-C to exit.
If you want to kill X type:
~# pkill X
Create the file /etc/X11/xorg.conf with this content:
Section "Device" Identifier "Frame Buffer" Driver "fbdev" Option "fbdev" "/dev/fb0" Option "Rotate" "CW" EndSection
Option "Rotate" "CCW"
then restart X
If you are using a Keyboard plugged in one of the board USB probably you need to set the keyboard layout. To do that type:
~# dpkg-reconfigure keyboard-configuration ~# invoke-rc.d keyboard-setup start
Another way is:
~# setxbmap -layout it
If you are using a Debian Wheezy download xinput-calibrator from the Debian Sid repository and install in in that way:
~# wget http://ftp.lt.debian.org/debian/pool/main/x/xinput-calibrator/xinput-calibrator_0.7.5+git20140201-1_armhf.deb ~# dpkg -i xinput-calibrator_0.7.5+git20140201-1_armhf.deb
If you are using Debian Jessy install with apt-get:
~# apt-get update ~# apt-get install xinput-calibrator
4.3 inch LCD display:
~# DISPLAY=":0" xinput_calibrator --geometry 480x272
5 or 7 LCD display:
~# DISPLAY=":0" xinput_calibrator --geometry 800x480
Create a directory for your photos:
~# mkdir myphoto ~# cd myphoto
and save on it these sample images:
~/myphoto# wget http://terzo.acmesystems.it/download/images-800x480.tar.gz ~/myphoto# tar -xvzf images-800x480.tar.gz
~/myphoto# wget http://terzo.acmesystems.it/download/images-480x272.tar.gz ~/myphoto# tar -xvzf images-480x272.tar.gz
Run the photo gallery using mplayer:
~/myphoto# mplayer mf://*.jpg -mf fps=0.1 -loop 0
Install Mplayer from the Debian repository:
~# apt-get install mplayer
Install Chocolate Doom from the Debian repository:
~# apt-get install chocolate-doom
plug an USB PC keyboard and launch it:
~# DISPLAY=":0" /usr/games/chocolate-doom -width 320 -height 240
export DISPLAY=:0.0 xset s off xset s noblank xset -dpms
~# apt-get install fbi
~# fbi -T 1 -noverbose photo.jpg
The /sys virtual filesystem contains all information about a framebuffer
device in /sys/class/graphics/
In order to get the size, use