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Submission: On November 23 via manual from AT — Scanned from DE
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Blogs Nathan Jones
EMBEDDED SYSTEMS ROADMAPS
Nathan Jones●November 9, 2023
* Software Development
* Education
* Career
INTRODUCTION
What does it mean to be an "embedded systems engineer"? What skills would it be
beneficial for you to develop if you want to be a successful one? Whether you've
only just finished your first Arduino project or you've been building embedded
systems for decades, we could all benefit from periodically assessing our skills
against a baseline and identifying new skills that we can learn. What follows
are a handful of opinions about the skills that should be considered as part of
a core body of embedded systems or software engineering knowledge. I want to
emphasize the word "opinions" because there is no one answer to what an embedded
systems engineer should know (nor is there, really, for any field). Nonetheless,
these "opinions" can be useful to identify the things "we don't know that we
don't know", helping make us more well-rounded engineers. (I feel like I
experience serendipity all the time in my professional career, by pursuing
things of their own accord to make myself a better engineer and then, surprise!,
it's needed on a project on which I'm working.) I hope you enjoy this list!
ACM CURRICULUM GUIDELINES FOR UNDERGRADUATE DEGREE PROGRAMS IN COMPUTER
ENGINEERING (2016)
The Association of Computing Machinery periodically provides recommendations to
undergraduate schools about what to include in certain degree paths and a
section of their recommendations from 2016 for a computer engineering degree
includes skills and knowledge related to embedded systems. Starting on page 80
of the PDF linked above, the ACM provides a list of course objectives applicable
to a one-semester course on embedded systems, which includes the following
subject areas:
This is your typical "intro to embedded systems" course, with the goal being to
introduce a student to their first microcontroller, which they will program in
an IDE with either the vendor HAL or peripheral registers. They are taught what
an embedded system is, how they are programmed and built, and how to use the
peripherals on the microcontroller such as GPIO, timers, interrupts, UART, SPI,
and I2C. Some courses will also discuss the basics of multitasking, RTOSes,
networking, or other useful concepts.
This article is available in PDF format for easy printing
In fact, the other courses listed by the ACM as part of an undergraduate degree
in computer engineering (shown below) also seem applicable to a course of study
for an embedded systems engineer.
Recommended math courses include
* Analysis of Continuous Functions,
* Discrete structures,
* Linear algebra, and
* Probability and statistics.
The PDF linked above lists recommended course objectives for each of the above
courses. A few excellent books (based solely on my own opinion) that discuss
these introductory concepts are listed below.
* Making Embedded Systems (Elecia White)
* One of the few (only?) introductory books I know of that's truly
MCU-agnostic
* Note: A second edition is set to be published in March 2024
* Programming Embedded Systems (Michael Barr)
* AVR Programming (Elliot Williams)
* Embedded Systems Architecture (Daniele Lacamera)
EMBEDDED SKILLS TREE (ELECIA WHITE)
Elecia White, host of the Embedded.fm podcast and author of Making Embedded
Systems, has written an embedded systems skills tree using a neat hexagonal
chart.
The idea is that you start at the bottom, with "Get an Arduino", and once that
skill or task has been completed, you move on to any other task that shares an
edge with that task and repeat. The chart expands outwards and upwards and is
set up to encourage multiple different paths to achieving mastery.
The list is broad and it includes both skills that might fall into an
introduction to embedded systems course ("Configure a timer", "Implement a state
machine", "Implement MCU sleep in a low-power project") and also more advanced
skills that commercial embedded systems projects might need ("Write a
bootloader", "Use a multi-core processor", "Create a CI/CD system").
EMBEDDED SYSTEMS ENGINEERING ROADMAP (MEYSAM PARVIZI)
Meysam Parvizi [m3y54m] is a GitHub user who's created an embedded systems
roadmap that covers everything from using a multimeter to understanding CAN.
It's a thorough list, though the idea that certain skills are "required" should
maybe be taken with a grain of salt. When this roadmap was discussed on the
Embedded.fm Slack I also remember some folks thinking that the application areas
(automotive, aerospace, agriculture, etc) should have been given greater
emphasis. Like many fields, having a broad skill set can make you marketable and
useful on many different projects but it's the specific skills that are needed
to accomplish the task at hand (which can vary greatly from field to field and
even project to project) that can make you invaluable to a specific team.
BETTER EMBEDDED SYSTEMS BY PHILIP KOOPMAN
In 2010, Philip Koopman, a long-time embedded systems engineer who specializes
in safety-critical systems, published a book that described all of the ways in
which embedded systems designs tend to fail their design reviews, including
discussions of everything from software architecture to the use of mutexes to
designing for reliability.
I've sometimes described this book as "showing you everything you have yet to
learn" about embedded systems, by which I mean it pretty well encompasses the
skills (beyond those covered in an introductory course) that someone might need
in their career to build and produce high-quality embedded systems. It makes an
excellent follow-up to an introductory course, especially if one uses it to
generate further study in one or more of the book's subject areas. The treatment
of all but a few topics is, unfortunately and expectedly, a little sparse and my
biggest complaint is that Phillip doesn't really provide many references for
further research (even though each chapter ends with a "Resources" section).
Also, the book doesn't discuss hardware much at all, as could have been
predicted by the book's title.
SOFTWARE ENGINEERING BODY OF KNOWLEDGE (IEEE COMPUTING SOCIETY)
Not to be outdone by the ACM, the IEEE Computing Society has also produced a
guide to their definition of a "software engineering body of knowledge" for
several years. Their guide (available here) lists 15 knowledge areas.
The knowledge areas are fairly comprehensive (reminiscent of the ACM guidelines
above) but, like "Better Embedded System Software", the list doesn't really
include any hardware considerations.
SOFTWARE SYSTEMS ENGINEERING PROGRAMMES: A CAPABILITY APPROACH (LANDWEHR, ET
AL.)
In 2017, an octet of software engineering researchers (that included famed
software engineer and researcher David Parnas) published a paper that discussed
the capabilities that they believed software engineers needed to be successful
in their jobs.
1. Communicate precisely between developers and stakeholders
2. Communicate precisely among developers
3. Design human-computer interfaces
4. Design and maintain multi-version software
* Identify and separate changeable concerns
* Document to ease revision
* Use parameterization
* Design software that can be moved to many platforms
* Design software that is easily extended or contracted
* Design and maintain products that will be offered in many versions
5. Design software for reuse
6. Ensure that software products meet quality standards
7. Develop secure software
8. Create and use models in system development
9. Specify, predict, analyze and evaluate performance
10. Be disciplined in development and maintenance
11. Use metrics in system development
12. Manage complex projects
The authors state that many current computer science degrees don't teach these
skills because computer science is a "research field" while software engineering
is a "class of professions". Additionally, they claim that the capabilities
listed are fundamental to the discipline of software engineering and, therefore,
somewhat timeless. I think it's a good list, particularly in that it seems to
acknowledge the skills most often needed for building successful embedded
systems "in the wild", more than merely being able to understand or design them.
"EMBEDDED SYSTEMS IS TOO BROAD; THERE'S NO WAY TO CREATE A SINGLE LIST OF CORE
SKILLS THAT EVERY EMBEDDED SYSTEMS ENGINEER IS SUPPOSED TO KNOW!" OR "I'VE BEEN
AN EMBEDDED SYSTEMS ENGINEER FOR OVER 40 YEARS AND I'VE NEVER NEEDED X" AND
RELATED COMPLAINTS COUNTERARGUMENTS
Regarding the former, I think this statement is patently false. Embedded
systems doesn't have a monopoly on being a "very broad discipline"; computer
science is equally broad and the field of medicine is arguably much, much
broader! Both of those fields somehow manage to identify a core set of required
knowledge for every practitioner (as evidenced by their respective degree paths)
and I think it's possible for embedded systems to do the same. Even this paper,
which seems to advocate for embedded systems education to look like
apprenticeships, admits that there are certain skills which are commonly lacking
in entry-level embedded systems engineers and which, therefore, would be good to
include in an introductory course of study. Additionally, although the specific
tools that are used might change, I think it is possible to enumerate a set of
skills that every embedded systems engineer ought to know. The exact nature of
"debugging" might look different from project to project, but I would argue that
all embedded systems engineers need to be good debuggers, for example.
Further, if embedded systems really doesn't have a core skill set and if it's
really best taught like an apprenticeship then we've begun to relegate it more
to the realm of "trade" than "engineering discipline". The emergence of coding
"boot camps" is the result of a similar push in the realm of computer science, I
think, and it seems that although this helps create more people to fill the job
of writing software it doesn't produce people who can necessarily write good
software or, maybe more fairly, architect good software systems. With the rise
of software and embedded systems in financial systems, avionics, and
automobiles, I think there's an imperative to not just make working embedded
systems but robust and secure embedded systems, qualities that don't necessarily
arise when something is taught merely as a trade. On a related note, and
speaking to the second counterargument above, I think it's to our own benefit to
establish and have a broad skill set. Although developing an embedded system
based on an 8-bit microcontroller is vastly different from developing one for an
application processor running embedded Linux, I would argue that the embedded
systems developer who specializes in programming the former and who has never
programmed the latter is doing themselves a disservice. Although it's definitely
possible to have a long and successful career as an embedded systems engineer
without knowing certain skills that others would consider important, I believe
that learning those skills helps make one a more well-rounded engineer and
improves their work in the areas where they do most of their work.
For these reasons, I think that embedded systems engineers can and should define
a core skill set that all embedded systems engineers should strive to know.
WRAPPING UP
First, take a breath! You might be feeling overwhelmed right now about how much
you don't know and I'm here to tell you that it's okay to have lots left to
learn! If you enjoy this field then think of it like being a master craftsman:
there is joy in getting better, regardless of how close or far away the goal
seems to be. Then, pick an area above that you don't know much about and start
learning! Do an internet search for a term you aren't familiar with, pick up one
of the books or PDFs I linked, or come up with a fun project you can complete
that will require a skill you don't know how to do yet. I wish you all the best
on your journey!
Do you have a favorite embedded systems roadmap or topic that wasn't listed? Do
you have a favorite book about embedded systems that other folks should know
about? Then you can also sound off in the comments to help make our community
better!
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