Ubuntu Features

From OMAPpedia

Contents 1 Features on Ubuntu 1.1 Output Logs 1.2 Ethernet 1.3 Touchscreen 1.3.1 Install Touchscreen Library and tools 1.3.2 Calibrate Touch Screen 1.3.3 Troubleshoot Touchscreen

Features on Ubuntu

Output Logs

If you want to change the ttyS output, create/update the file in /etc/init/ To use ttyS3, create ttyS3.conf. Update the below line to the correct ttyS number

respawn 

exec /sbin/getty 115200 ttyS3

This can be configured while creating the filesystem by giving --ttyS3 in the rootstock command line. But if this needs to be changed later, follow the above.

Ethernet

To enable network access, modify /etc/network/interfaces and add the below 2 lines.

auto eth0
iface eth0 inet dhcp

This can also be done at the command prompt:

sudo ifconfig eth0 up
sudo dhclient eth0

or:

sudo ifconfig -a
sudo dhclient ethX
where 'X' is the number you see in ifconfig e.g. eth1

If you are behind a firewall and couldn't access the network, follow the below instructions.

(When you sudo apt-get install, you might get an error, Couldn't resolve http://ports.ubuntu.com)

Enable the proxy in /etc/profile (add the below line)

export http_proxy=""

Also, update /etc/apt/apt.conf.d/01ubuntu - add the below line

Acquire::http:proxy "";

Also, you can add other respositories available for your region in /etc/apt/sources.list deb http://archive.ubunut.com/ main universe

Touchscreen

Install Touchscreen Library and tools

Download and Install Touch screen Library(tslib) and tools.

If network has been enabled in Ubuntu, this can be done at the target(Zoom) itself.

sudo apt-get install xserver-xorg-input-tslib libts-bin

ts_calibrate utility is in the lib-ts package

Remove the Synaptics Driver

sudo apt-get remove xserver-xorg-input-synaptics

==== Add TouchScreen as InputDevice

Add the following sections to /etc/X11/xorg.conf file

Section "InputDevice"
 Identifier      "touchscreen"
 Driver          "tslib"
 Option          "Device"                "/dev/input/event1"
 Option          "SendCoreEvents"        "on"
 Option          "Width" "480"
 Option          "Height" "640"
 Option          "SHMConfig" "true"
EndSection

Section "ServerLayout"                                 
  Identifier      "Builtin Default Layout"                                     
  #        Screen  "Builtin Default fbdev Screen 0"
  InputDevice     "touchscreen" "CorePointer"        
EndSection 

Note: Ubuntu Karmic(9.10) doesn't have xorg.conf by default giving room for autodetection.

Refer to How to create xorg.conf

Calibrate Touch Screen

Now we have to calibrate the Touchscreen. X-server has to be stopped before doing this.

In the Terminal type: sudo /usr/sbin/gdm-stop

Type in the terminal...

 TSLIB_TSDEVICE=/dev/input/event1 

 TSLIB_CONFFILE=/etc/ts.conf 

 TSLIB_CALIBFILE=/etc/pointercal 

 export TSLIB_TSDEVICE TSLIB_CONFFILE TSLIB_CALIBFILE

 ts_calibrate

Note: The above env variables for Touchscreen can also be added to /etc/profile

This will start the calibration Process for the Touchscreen. After that we have to restart the X-Server. sudo /usr/sbin/gdm-restart

This will start the X-Server. Now the Touchscreen should work

Shortcut/Hack: If you have the Zoom calibrated on another distro like Poky or Angstrom, you can copy /etc/pointercal file directly into /etc which will provide the calibration information.

Troubleshoot Touchscreen

Check if the Touchscreen responds: cat /dev/input/event1 If you touch the Screen and see some garbage Output in the screen, it means that the device is working.