Configure mtouch

This section specifies the configuration applied to the touch devices supported by the platform.

This section must begin with begin mtouch and end with end mtouch.

There can be multiple mtouch sections within a configuration file. The number of mtouch sections depends on the number of physical displays supported by the platform. If you have mutliple displays, you can configure the driver for each display; therefore you would have one mtouch section for each of these displays.

From within the mtouch section of the configuration file, filters that are related to the mtouch devices are specified in the section starting with begin filter and ending with end filter.

Below is an example of multiple mtouch sections of a graphics.conf file:

  begin mtouch
        driver = devi
        options = height=720,width=1280
        scaling = /armle-v7/usr/lib/graphics/omap4430/scaling_omap4.conf
        display = 1
  end mtouch

  begin mtouch
        driver = egalax
        options = height=800,width=480
        scaling = /armle-v7/usr/lib/graphics/omap4430/scaling_omap4.conf
        display = 2
  end mtouch

Once screen is running, run the calib-touch utility with the -display option from either your startup script or from a shell to calibrate your touchscreens.

scaling.conf

The scaling.conf file is a free-form ASCII text file. It is parsed by Screen. The file may contain extra tabs and blank lines for formatting purposes. Keywords in the file are case-sensitive. Comments may be placed anywhere within the file (except within quotes). Comments begin with the # character and end at the end of the line.

You must define a mode for the touch coordinates using a scaling.conf configuration file; you can define only one mode per configuration. The mode recommended is the scale mode configured with the resolution of your display. For example, your entry in the scaling.conf file would be:

1280x720:mode=scale

By default, Screen expects scaling.conf file at this location:

/etc/system/config/scaling.conf

If your scaling.conf file is not located at the above location or is not named scaling.conf, you will need to indicate the correct path and name of your scaling configuration file using the scaling parameter in your mtouch configuration section.