copyright 2018 amazon web services · that new image is ready application activates when it is...


Richard Barry Founder – FreeRTOS Project

Principal Engineer – Amazon Web Services


The FreeRTOS kernel, and Traditional Use Cases

Design Goals

Differences from General Purpose Operating Systems

IoT Relevant AWS Cloud Services

Amazon FreeRTOS Libraries

Amazon FreeRTOS, Connected Use Cases


It is a kernel, or scheduler, or RTOS, depending who you ask

15 Year Heritage

MIT Licensed C Code and Pre-configured Projects


Real Time Linux

Processor power

μCLinux, eCOS

No Scheduler FreeRTOS

Ap

plic

abili

ty

10s of K of RAM 100s of K of Flash

Rapid Support

Windows Host

Visible Activity

Leadership Documentation

Demonstrable Code Quality

Customer Obsession

Knowledgeable Support

Paid Options

Robustness

No IP Infringement

Enterprise Friendly Licensing Copyright 2018 Amazon Web Services


Month

0

2,000

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14,000

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wn

load

s

Copyright 2018 Amazon Web Services 8

Source File Downloads

FreeRTOS.org

SVN

aws.amazon.com/FreeRTOS

GitHub


Blocked Task 2

Top of Stack for Task

Rn Copy

…

R1 Copy

R0 Copy

Status Register

Program Counter Copy

Stack Variable

Stack Variable

Return Address

Empty Stack Space

Empty Stack Space

Blocked Task 1


Rn Copy

…

R1 Copy

R0 Copy

Status Register


Stack Variable

Stack Variable

Return Address

Empty Stack Space

Empty Stack Space

Ready Task 1


Rn Copy

…

R1 Copy

R0 Copy

Status Register


Stack Variable

Stack Variable

Return Address

Empty Stack Space

Empty Stack Space

Rn

…

R1

R0

Stack Pointer

Program Counter

Running Task


Empty Stack Space

Empty Stack Space

Empty Stack Space

Empty Stack Space

Empty Stack Space

Empty Stack Space

Stack Variable

Stack Variable

Return Address

Empty Stack Space

Empty Stack Space


User (Application) Code

Vendor Supplied Libraries

Hardware

FreeRTOS

Kernel

[Middleware Libraries]


Depends on the application, but generally:

Meet real time requirements!

Maximize responsiveness

Use as little CPU/Power as possible

Maximize maintainability

Maximize portability (hardware change)

Simplicity!

Fast to market

Meet requirements with minimum expenditure


LCD

Alarm Annunciator ADC Input

Keypad Input

Timer

Motor Position

CAN Request

Commutation

/Control Motor

Formatting Flash Disk

CAN Driver/

Protocol

CAN Response

Convert and

Display


ISR

ISR

Function1_Run();

Function4_Run();

Function3_Run();

Function2_Run();


ISR

ISR


DoSomething()

A Task

xStreamBufferReceive()

ProcessBytes()

DoSomething()

An Interrupt

xStreamBufferSendFromISR()

Stream Buffer

Copyright 2018 Amazon Web Service

xStreamBufferReceive()

Copyright 2018 Amazon Web Services 21

Suspended

Blocked

Ready Running

Tick event if timeout / Trigger level hit if no timeout

On-demand delivery of compute power, databases, applications, etc. via the internet, >125 services

Pay-as-you-go pricing



Fleet onboarding, management and

SW updates

Fleet audit and protection

IoT data analytics and intelligence

Cloud

Storage & Compute

Intelligence

Insights & Logic → Action

Secure device connectivity

and messaging


Endpoints

Fleet onboarding, management and

SW updates

Fleet audit and protection

IoT data analytics and intelligence

Gateway

Things

Sense & Act

Cloud

Storage & Compute

Secure local triggers, actions,

and data sync

Intelligence

Insights & Logic → Action

Secure device connectivity

and messaging


Functionality

Communications

Stack

Security Stack

Key Management

OTA

Bootloader



Hardware

FreeRTOS

Kernel


MQTT I/O Port Key

Manage-

ment

MQTT



Secure

Storage


Hardware

Wi-Fi TLS Library

TCP/IP FreeRTOS

Kernel



ISR

ISR

ISR

ISR


Developer authors update

Upload to cloud and sign image

Schedule an update job

Notify device update is available






Device downloads image (or streams

over MQTT) Write image to flash

Close file and verify signature

Notify application that new image is

ready

Application activates when it is ready (set boot flags and reset)






Device downloads image (or streams

over MQTT) Write image to flash

Close file and verify signature

Notify application that new image is

ready

Application activates when it is ready (set boot flags and reset)

Verify image at boot Initialize OTA agent and confirm current

image is latest

Hand control to application for self

test

On passing self test, commit new image

Update cloud status to completed.

MQTT I/O Port Key

Manage-

ment

MQTT



Secure

Storage


Hardware

Wi-Fi TLS Library

TCP/IP FreeRTOS

Kernel



ISR

ISR

ISR

ISR



Hardware

FreeRTOS

Kernel

MQTT Agent OTA Agent Greengrass Discovery




Detect Anomalies to Predict Pump Failure

https://www.FreeRTOS.org

https://freertos.org/FreeRTOS-quick-start-guide.html

https://www.freertos.org/Documentation/RTOS_book.html

https://aws.amazon.com/freertos


https://www.freertos.org/











https://aws.amazon.com/freertos


Predict Crop Quality


Global Mining Company Minimizes Unexpected Downtime

copyright 2018 amazon web services · that new image is ready application activates when it is...

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