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Onion Omega2 Dash IoT Computer - a touchscreen device based on the Omega2

front back

Getting Started

Get your Omega2 Dash up and running by following the Omega2 Dash guide.

Hardware Info

Schematics and layout images along with physical measurements are available for the Omega2 Dash in the Hardware directory.

Firmware Info

Firmware for the Omega2 Dash is built using Onion's fork of the OpenWRT source repo.

Differences from the regular Omega2/Omega2+ firmware include:

  • Includes kernel driver for the ILI9341 TFT driver. This enables the /dev/fb0 framebuffer device.
  • Includes the omega2-dash-base software package

To build firmware for the Omega2 Dash using Onion's OpenWRT source repo, run python scripts/ -c .config.O2Dash before launching the compilation.

For more details, see the omega2-dash-base package in Onion's OpenWRT Packages Repo.

Doing Things with the Omega2 Dash

Everything you need to know about using the Omega2 Dash can be found in the Omega2 Dash guide.

The topics below are available for quick reference.

Backlight Control

Backlight is controlled by GPIO21 (PWM Channel 3)

  • 100% duty cycle = min brightness
  • 0% duty cycle = max brightness
omega2-ctrl gpiomux set uart2 pwm23
onion pwm 3 50 120

omega2-ctrl gpiomux set uart2 pwm23
onion pwm 3 0 120

The second-last argument controls the duty cycle.

Touch Driver

Using XPT7603 controller, connected to Omega via I2C

  • I2C Address: 0x48
  • Interrupt pin: GPIO14

Shell commands to test touch input:

#read X
i2cget -y 0 0x48 0x88 w

#read Y
i2cget -y 0 0x48 0x98 w

Controlling the Display

By default, the framebuffer is connected to the /dev/tty1 virtual device.

Try echoing to this tty and you'll see the contents printed on the display!

echo "hello from the Omega2 Dash" > /dev/tty1

The blinking cursor on the display can be disabled:

echo 0 > /sys/class/graphics/fbcon/cursor_blink

To enable it again, just echo a 1 instead.

The orientation of the display can also be changed:

echo 1 > /sys/class/graphics/fbcon/rotate

Valid options are 0, 1, 2, and 3


Terminal Demo

Running the Omega's terminal on the display:

terminal demo gif

  • Run sh > /dev/tty0 on your Omega2 Dash. Everything you type from then on will show up on the display and not in your terminal window
  • Hit ctrl+d to exit

Displaying png & jpg Images

Display image files:

onion logomap

Steps to display images on your Omega2 Dash:

  • First install the fbi package: opkg update ; opkg install fbi
    • This only needs to be done once
  • Transfer image files to the Omega. Supported file types are png, jpg
  • Display the images by running fbi -a -d /dev/fb0 -notty -nocomments --noverbose <PATH TO IMAGE FILE>

For example: fbi -a -d /dev/fb0 -notty -nocomments --noverbose /root/map.png

The fbi program is really flexible, try running it with multiple files and see what happens!

LittleVGL UI Demo

This is a demo program! If you're looking for a solid foundation for building an LVGL program for the Omega2 Dash, please see the lvgl quickstart template:

Demo of a touch-enabled GUI made with LittleV Graphics Library:

littlev demo gif

Steps to run on your Omega2 Dash:

LittleVGL Example Program & Quickstart Template

We've put together an program that can serve as the starting for Omega2 Dash programs using the LittleV Graphics Library. See the repo here:

Out of the box it supports:

  • The Linux Framebuffer - will draw to the Omega2 Dash display
  • The XPT7603 touch input device on the Omega2 Dash
  • A script to cross compile the code for the Omega2 Dash (using Docker and the OpenWRT SDK)
  • A makefile and instructions to build it as an OpenWRT package
  • A small demo

Use this to get started with your own lvgl programs!


Steps to run the existing example on your Omega2 Dash:


Onion Omega2 Dash IoT Computer







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