MicroEJ OS and Edje: the software foundation for IoT devices

eclipsecon France 2016© IS2T S.A. 2016. All rights reserved.
EDJE PROJECT
The Software Foundation for IoT Devices
https://projects.eclipse.org/projects/iot.edje

eclipsecon France 2016
PRESENTER
Stéphane Mainchain
Director, Customer Care
stephane.mainchain@microej.com
The information contained herein is not warranted to be error-free.
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Other trademarks are proprietary of their respective owners.

ABOUT MICROEJ

ABOUT MICROEJ
Independent Software Vendor, global player in the IoT industry
• http://www.microej.com/about
• Software tool & runtime licenses
• Professional services, training & consulting
KEY FINANCIALS
• $5M Series B funding end 2011 – $20M R&D total investment
Offices in France, Germany, USA
Partnerships with key IoT, silicon, embedded SW and HW (EMS) vendors
Expertise in embedded, virtualization, software engineering & process

OPERATING SYSTEMS FOR ENABLING THE IOT
RTOS Linux
Volume
75%
IoT = “sub-gig” things:
• Processor < GHz
• Memory < GB
25%
SW Foundation
MPU (>$10 ASP)MCU ($1-6 ASP)

EDJE AND IOT
INTRODUCTION

EDJE PROJECT
The Hardware Abstraction Java API for the IoT embedded systems
• Peripheral management
• Controller Communication Interfaces (Serial connection, CAN, SPI, I²C)
• Digital and Analog I/O (GPIO, ADC, DAC)
Scope
• Target resource-constrained micro-controller
• Provide ready-to-use software packages for target hardware
• Define a modular and easy to port framework
Project Status
• Eclipse IoT project
• Incubation
• Initial contribution in review

IOT TOPOLOGY
IOT DEVICES GATEWAY SERVER
8/16/32-bit MCU Mono-Core
Frequency: < 200 MHz
Flash: < 1 MB
RAM: < 512 KB
32/64-bit MPU Multi-Core
Frequency: in GHz
Flash: in GB
RAM: in GB
MCU
MPU

IOT HARDWARE
STM32F4 Discovery Raspberry PI 2
• Processor: 32-bits quad-core
Cortex-A7 (BCM2836)
• Frequency: 900 MHz
• RAM: 1 GB
• Flash: SD Card
• Processor: 32-bits Cortex-M4
(STM32F407VGT6)
• Frequency: 168 MHz
• RAM: 192 KB
• Flash: 1 MB

EDJE APPLICATION FIELD
Sensors/Actuators
Local Network
Internet
A library at the edge of the IoT for
sensor hubs and devices

EDJE DEVICE
CONFIGURATION

List of Java API
• The minimum execution environment provided by an Edje compatible
device
• Intersection between Java SE, Java SE Embedded, MicroEJ and Android
• Includes java.lang, java.util, java.io, …
EDJE DEVICE CONFIGURATION
J2SE
J2SE
Embedded
MicroEJ Android
Edje

List of Java API
• The minimum execution environment provided by an Edje compatible
device
• Intersection between Java SE, Java SE Embedded, MicroEJ and Android
• Includes java.lang, java.util, java.io, …
EDJE DEVICE CONFIGURATION
Edje Device Configuration
Edje API
Edje Application
Library
Execution
Environment

EDJE API

EDJE API
Edje comes with the following services
Controller
Communication
Interfaces
Serial Port
CAN
Digital and
Analog I/O
GPIO
Peripheral
Management
LCD
USB Devices
Analog Input

EDJE API
Peripheral Management
• List the peripherals of a platform
o MCU peripherals (UART, timer, USB controller, …)
o Board peripherals (screen, button, LED, sensors, …)
o External peripherals (USB devices, bluetooth devices, …)
• Peripheral plug/unplug notification system

EDJE API
Controller Communication Interfaces
• Some peripherals can establish a connection to external devices
o Serial Connection (UART)
o Serial Peripheral Interface (SPI)
o Inter-Integrated Circuit (I²C)
o Controller Area Network (CAN)
• The peripheral implements Connectable interface
• Connection is described by a String
• Example with serial ports:
List<SerialPort> serialPorts = PeripheralManager.list(SerialPort.class);
for(SerialPort serialPort : serialPorts){
Connection connection = serialPort.openConnection("baudrate=115200;bitsperchar=8");
…
connection.close();
}

EDJE API
Digital and Analog I/O
• Manage controller pins
• API inspired from Arduino C API
• General Purpose Input/Output (GPIO)
o LED, Buzzer, Button
• Analog to Digital Converter (ADC)
o Potentiometer, Temperature Sensor, Light Sensor
• Digital to Analog Converter (DAC)
o Speaker, Light Dimmer
• Pulse Width Modulation (PWM)
o Motor

REFERENCE
IMPLEMENTATIONS

REFERENCE IMPLEMENTATIONS
Features
• Peripheral Management
• UART, USB CDC, GPIO, DAC, ADC
Hardware
• Raspberry-Pi 2
• Quad-Cortex-A7 @ 900 MHz
• RAM: 1 GB RAM
Platform
• Kura
• OpenJDK
• Linux

Features
Hardware
• STM32F746G-DISCO
• Cortex-M7 @ 200 MHz
• RAM: 8 MB
• Flash: 16 MB
Platform
• MicroEJ OS
• FreeRTOS
• STM32Cube

Features
PC Simulation
• Java® SE
• Hardware In the Loop Simulation (HIL)
Execution
Flow
Ethernet
or Serial

DEMO
=
+ +
over MicroEJSTM32F746G-DISCO Arduino Multi-function
Shield

THANK YOU!
www.microej.com

MicroEJ OS and Edje: the software foundation for IoT devices

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