Onion Omega2S User manual

GETTING STARTED
Onion Omega2S Development Kit
Getting Started Guide
Version 1.0
Omega2 IoT Computer
Onion Omega2S Development Kit
1

Revision History
Revision
Date
Description
1.0
March 17, 2018
Initial release
Onion Omega2S Development Kit
2

Table of Contents
1. Introduction 4
2. Hardware Overview 5
2.1 Omega2S Hardware Overview 5
2.1.1 Differences from the Omega2 6
2.2 SD Card Development Board Overview 7
2.3 eMMC Development Board Overview 8
3. Hardware Setup 9
4. First Time Setup 13
5. Using the Development Kit 13
5.1 Common Usage 13
5.1.1 Using GPIOs 13
5.1.2 Using USB Storage 13
5.1.3 Using an SD card 14
5.1.4 Rebooting the Omega2S 15
5.1.5 Factory Reset 15
5.2 Removing Omega2S from the Dev Board 16
6. Additional Resources 17
6.1 Hardware Setup Video 17
6.2 Omega2S Datasheet 17
6.3 Schematics 17
6.3.1 Development Board Schematics 17
6.3.2 Omega2S Reference Design Schematics 17
Onion Omega2S Development Kit
3

1. Introduction
The Omega2S Development Kit consists of the Omega2S, Onion’s surface-mount Linux WiFi
module, and the Development Board, meant to showcase the functionality of the Omega2S
module and serve as a test-bed for initial product development.
The Omega2S is a highly integrated WiFi enabled, Linux module designed by Onion
Corporation. It utilizes the Mediatek MT7688AN System on a Chip (SoC) which is based on the
MIPs 24K CPU processor core. The SoC includes 802.11b/g/n Wi-Fi, making the Omega2S
ideal for Internet of Things (IoT) applications and projects. In addition to the SoC, the module
includes DDR2 DRAM, Flash memory, and all of the components necessary to allow this
product to be a fully functional and complete device.
The Omega2S Development Board has an easy insertion socket for the Omega2S Module, and
exposes all of the available Omega2S hardware I/O: including the USB Port, Ethernet Port,
Dual Reset Functions, and Connectors Pins for all other I/O.
There are two versions available:
● Omega2S Development Kit - SD: SD Card Slot Version
● Omega2S Development Kit - eMMC: 8GB eMMC Memory Version
For easy development, the Development Board can be powered via the Micro-USB port. The
Micro-USB port also allows for easy access to the Omega’s command line, thanks to the
on-board USB-to-Serial chip. Finally, the PCB trace WiFi antenna allows the Omega2S to
connect to WiFi networks without the need for an external uFL antenna.
Onion Omega2S Development Kit
4

2. Hardware Overview
The Omega2S Development Kit consists of the Omega2S and the Development Board.
2.1 Omega2S Hardware Overview
The Omega2S Module is a Surface Mount version of Onion Omega2 board, designed
specifically for high volume commercial and industrial applications. It’s low profile (only 2.8mm
high) and gives you high flexibility and availability of designing your custom products with the
power of Omega2S. It has 42 additional I/O pins, and a uFL connector for an external antennas.
It is available in two memory size versions, similar to the Omega2:
● Omega2S: 64 MB DRAM, 16 MB Flash
● Omega2S+: 128 MB DRAM, 32 MB Flash
Onion Omega2S Development Kit
5

Pinout Diagram:
2.1.1 Differences from the Omega2
Other than the obvious form-factor differences from the through-hole Omega2, the Omega2S
also features the following:
● Exposes more IOs: 43 General Purpose I/Os (as opposed to the 21 available on the
through-hole version)
● The additional exposed I/Os include:
○ All I/Os required for using an SD card slot or eMMC memory
○ Using 4 additional Ethernet ports - for a total of 5 ports
○ Access to UART2
○ Access to SPI CS0
● Does not feature a built-in SMT WiFi antenna - optimizing area and allowing the
end-user the freedom to select between using the ANT I/O or the uFL connector
Onion Omega2S Development Kit
6

2.2 SD Card Development Board Overview
This version features an SD card slot.
Onion Omega2S Development Kit
7

2.3 eMMC Development Board Overview
This version features an on-board 8GB eMMC storage module. It does not feature an SD card
slot as they are mutually exclusive.
Onion Omega2S Development Kit
8

3. Hardware Setup
Follow this guide in order to connect the Omega2S to the Development Board properly and
power it up. We’ll outline the suggested steps to perform the physical connection and power up
the device.
See our visual guide for more details: https://youtu.be/aoYadArVJPw
Steps:
● Insert Omega2S into the socket
○ Omega2S has 3 sides with pins, make sure to match the sides with pins to the
rail-pins on the Dev Board socket
○ Make sure your Omega is plugged and pressed down to complete the connection
Onion Omega2S Development Kit
9

● Socket pin combing
○ Ensure the connection between the Omega2S and socket by using your thumb to
comb the rail-pins of the Omega2S socket on the Development Board to avoid
disconnected pins and undefined behavior (Please see the picture below)
● Refer to our visual guide for more clarity on the combing procedure:
https://youtu.be/aoYadArVJPw
Onion Omega2S Development Kit
10

○ Always check that each rail-pin is connected to its corresponding Omega
castellated socket before powering the device. The image below represents the
incorrect positioning of the rail-pin:
● Power up and turn on the Omega
○ Connect a Micro-USB cable to the Dev Board and turn on the power switch ON
by pressing the white button down till it clicks
○ For best results, use a high-quality cable that is at most 2m (6ft) long
● Omega LED indicates booting
○ LED218 Blinks on Boot. Once booted, it will become solid, meaning that the
Omega has completed its boot sequence.
○ LED243 Stays solid at all times when powered up
Onion Omega2S Development Kit
11

Onion Omega2S Development Kit
12

4. First Time Setup
When Omega2S has completed the boot sequence, LED218 will stop blinking and remain solid.
This takes approximately 1 minute.
Since the Dev Board has a USB-to-Serial chip on-board, use USB connection to connect to the
serial terminal.
● Please follow our guide on how to connect to the Omega via Serial
● Once a connection to the Omega is established, the Omega can be connected to a
nearby WiFi network
○ Please follow the steps on how to setup the Omega through the Command Line
5. Using the Development Kit
Most Omega2 documentation applies to the Omega2S Development Kit as well:
https://docs.onion.io/omega2-docs
5.1 Common Usage
5.1.1 Using GPIOs
● To control the GPIO’s of the Omega2S, follow the guide on using the Omega’s GPIOs
● Each available GPIO has its own LED that serves as a status indicator.
○ Please note, the LED’s are active LOW, so in order to activate them, pass logic 0
to the connected GPIO.
5.1.2 Using USB Storage
● The Dev Board has a USB Port that exposes the Omega’s USB2.0 host port. This port
can be used for USB storage devices, USB cameras, etc.
Onion Omega2S Development Kit
13

● Please follow the guide on how to properly mount the USB device and customize the
default configurations
● It is also possible to:
○ Use a swap file on external storage to extend the Omega’s available memory
○Move the OverlayFS to external storage, effectively running the Omega’s OS
from the external storage device, greatly expanding the amount of available
storage
5.1.3 Using an SD card
● Omega2S Development Kit SD Card Slot Version comes with an on-board SD card slot
● SD Cards up to 128GB are supported
● For further details and information about using SD cards, follow our guide on using an
SD Card
Onion Omega2S Development Kit
14

5.1.4 Rebooting the Omega2S
● There are two ways to initiate a reboot of the Omega2S:
○Software:  From your terminal screen, run the reboot command
○Hardware:  Perform a quick press and release of the WPS Reset push-button
● To learn more, please read our documentation on rebooting your Omega
5.1.5 Factory Reset
The Omega2S can be restored to a “factory” state in case of data corruption or lost
configuration files. Performing a Factory Restore on the Omega will revert all files to the default
for the currently installed firmware, all other files will be deleted.
There are two ways to perform this operation:
●Hardware:
○ Locate the `WPS Reset` push button on the Dev Kit.
○ Press and hold the reset button for about 10 seconds. It will trigger a factory
reset.
■ LED218 will start blinking and after your release the button it will start
actual process.
● To learn more and to see how to initiate a factory reset from the command line, refer to
our documentation on factory reset
Onion Omega2S Development Kit
15

5.2 Removing Omega2S from the Dev Board
Follow the instructions below to safely remove the Omega2S from the Dev Board socket and
avoid damaging your device.
First, power off the Omega and Dev Board. Use the hole in the Omega2S socket on the Dev
Board to push the Omega2S from the underside with your finger. Push the Omega until it is free
of the socket rail-pins, then grab it from the opposite side.
Refer to our visual guide for more clarity on the removal procedure:
https://youtu.be/aoYadArVJPw
Onion Omega2S Development Kit
16

6. Additional Resources
6.1 Hardware Setup Video
Refer to our visual guide for more clarity on the safely inserting and removing the Omega2S to
and from the Development Board socket: https://youtu.be/aoYadArVJPw
6.2 Omega2S Datasheet
To learn more about the Omega2S moudle, see the datasheet.
6.3 Schematics
6.3.1 Development Board Schematics
Schematics for the Development Board are available online.
6.3.2 Omega2S Reference Design Schematics
An Omega2s reference design and its schematic are available online.
Onion Omega2S Development Kit
17

Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Onion:
OM2S-DK-EM OM2S-DK-SD