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Core competencies

Colin Walls May 27, 2024

Creating software from scratch is attractive, as the developer has total control. However, this is rarely economic or even possible with complex systems and tight deadlines.


Finite State Machines (FSM) in Embedded Systems (Part 4) - Let 'em talk

Massimiliano Pagani May 22, 20242 comments

No state machine is an island. State machines do not exist in a vacuum, they need to "talk" to their environment and each other to share information and provide synchronization to perform the system functions. In this conclusive article, you will find what kind of problems and which critical areas you need to pay attention to when designing a concurrent system. Although the focus is on state machines, the consideration applies to every system that involves more than one execution thread.


Getting Started With CUDA C on an Nvidia Jetson: A Meaningful Algorithm

Mohammed Billoo May 11, 2024

In this blog post, I demonstrate a use case and corresponding GPU implementation where meaningful performance gains are realized and observed. Specifically, I implement a "blurring" algorithm on a large 1000x1000 pixel image. I show that the GPU-based implementation is 1000x faster than the CPU-based implementation.


Five Embedded Linux Topics for Newbies !

George Emad May 9, 2024

Are you an embedded systems enthusiast looking to broaden your horizons with embedded Linux? explore those 5 topics.


Introduction to PIC Timers

Luther Stanton May 8, 2024

The fourth in a series of five posts looks at 8-bit PIC hardware timers. After a review of basic timer functionality, the Timer0 module operation and configuration is reviewed and a basic application implemented using Timer0 to blink external LEDs at a frequency of 0.5Hz.


You Don't Need an RTOS (Part 2)

Nathan Jones May 7, 20246 comments

In this second article, we'll tweak the simple superloop in three critical ways that will improve it's worst-case response time (WCRT) to be nearly as good as a preemptive RTOS ("real-time operating system"). We'll do this by adding task priorities, interrupts, and finite state machines. Additionally, we'll discuss how to incorporate a sleep mode when there's no work to be done and I'll also share with you a different variation on the superloop that can help schedule even the toughest of task sets.


Finite State Machines (FSM) in Embedded Systems (Part 3) - Unuglify C++ FSM with DSL

Massimiliano Pagani May 7, 2024

Domain Specific Languages (DSL) are an effective way to avoid boilerplate or repetitive code. Using DSLs lets the programmer focus on the problem domain, rather than the mechanisms used to solve it. Here I show how to design and implement a DSL using the C++ preprocessor, using the FSM library, and the examples I presented in my previous articles.


Turn It On Again: Modeling Power MOSFET Turn-On Dependence on Source Inductance

Jason Sachs April 29, 2024

This is a short article explaining how to analyze part of the behavior of a power MOSFET during turn-on, and how it is influenced by the parasitic inductance at the source terminal. The brief qualitative reason that source inductance is undesirable is that it uses up voltage when current starts increasing during turn-on (remember, V = L dI/dt), voltage that would otherwise be available to turn the transistor on faster. But I want to show a quantitative approximation to understand the impact of additional source inductance, and I want to compare it to the effects of extra inductance at the gate or drain.


Linear Feedback Shift Registers for the Uninitiated

Jason Sachs April 28, 2024

In 2017 and 2018 I wrote an eighteen-part series of articles about linear feedback shift registers, or LFSRs:

div.jms-article-content ol > li { list-style-type: upper-roman } Ex-Pralite Monks and Finite Fields, in which we describe what an LFSR is as a digital circuit; its cyclic behavior over time; the definition of groups, rings, and fields; the isomorphism between N-bit LFSRs and the field \( GF(2^N) \); and the reason why I wrote this series

2024 Embedded Online Conference's Schedule

Stephane Boucher April 25, 2024

Welcome to the 2024 Embedded Online Conference! Like with previous years, this year's event will be a mix of pre-recorded on-demand sessions and live Zoom sessions. We've carefully curated the schedule to ensure that you have access to a wealth of valuable content throughout the week.

Most talks will be released on-demand, while most workshops and keynotes will be done live on Zoom. There will also be multiple live 20-minute-long Q&A sessions happening throughout the week, providing you...


Adventures in Signal Processing with Python

Jason Sachs June 23, 201311 comments

Author’s note: This article was originally called Adventures in Signal Processing with Python (MATLAB? We don’t need no stinkin' MATLAB!) — the allusion to The Treasure of the Sierra Madre has been removed, in deference to being a good neighbor to The MathWorks. While I don’t make it a secret of my dislike of many aspects of MATLAB — which I mention later in this article — I do hope they can improve their software and reduce the price. Please note this...


How to Estimate Encoder Velocity Without Making Stupid Mistakes: Part I

Jason Sachs December 27, 201230 comments

Here's a common problem: you have a quadrature encoder to measure the angular position of a motor, and you want to know both the position and the velocity. How do you do it? Some people do it poorly -- this article is how not to be one of them.

Well, first we need to get position. Quadrature encoders are incremental encoders, meaning they can only measure relative changes in position. They produce a pair of pulse trains, commonly called A and B, that look like...


My Love-Hate Relationship with Stack Overflow: Arthur S., Arthur T., and the Soup Nazi

Jason Sachs February 15, 201551 comments

Warning: In the interest of maintaining a coherent stream of consciousness, I’m lowering the setting on my profanity filter for this post. Just wanted to let you know ahead of time.

I’ve been a user of Stack Overflow since December of 2008. And I say “user” both in the software sense, and in the drug-addict sense. I’m Jason S, user #44330, and I’m a programming addict. (Hi, Jason S.) The Gravatar, in case you were wondering, is a screen...


Ten Little Algorithms, Part 2: The Single-Pole Low-Pass Filter

Jason Sachs April 27, 201516 comments

Other articles in this series:

I’m writing this article in a room with a bunch of other people talking, and while sometimes I wish they would just SHUT UP, it would be...


Thermistor signal conditioning: Dos and Don'ts, Tips and Tricks

Jason Sachs June 15, 201118 comments

In an earlier blog entry,  I mentioned this circuit for thermistor signal conditioning:

It is worth a little more explanation on thermistor signal conditioning; it's something that's often done poorly, whereas it's among the easiest applications for signal conditioning.

The basic premise here is that there are two resistors in a voltage divider: Rth is the thermistor, and Rref is a reference resistor. Here Rref is either R3 alone, or R3 || R4, depending on the gain...


VHDL tutorial - part 2 - Testbench

Gene Breniman October 30, 20073 comments

In an earlier article I walked through the VHDL coding of a simple design. In this article I will continue the process and create a test bench module to test the earlier design. The Xilinx ISE environment makes it pretty easy to start the testing process. To start the process, select "New Source" from the menu items under "Project". This launches the "New Source Wizard". From within the Wizard select "VHDL Test Bench" and enter the name of the new module (click 'Next' to...


Zebras Hate You For No Reason: Why Amdahl's Law is Misleading in a World of Cats (And Maybe in Ours Too)

Jason Sachs February 27, 20171 comment

I’ve been wasting far too much of my free time lately on this stupid addicting game called the Kittens Game. It starts so innocently. You are a kitten in a catnip forest. Gather catnip.

And you click on Gather catnip and off you go. Soon you’re hunting unicorns and building Huts and studying Mathematics and Theology and so on. AND IT’S JUST A TEXT GAME! HTML and Javascript, that’s it, no pictures. It’s an example of an


Using the Beaglebone PRU to achieve realtime at low cost

Fabien Le Mentec April 25, 20148 comments
Introduction

I work as an engineer in a synchrotron facility. A few weeks ago, I helped the people in charge of the power supply developments to integrate a realtime control algorithm on a prototype platform: a BeagleBone Black (BBB) running Linux. I had already worked with this board in the past, and I found it very interesting given its excellent resources versus price ratio (around 40 euros). This time, I was impressed by its realtime capabilities. I thought it would be a good idea to...


Coroutines in one page of C

Yossi Kreinin August 20, 201315 comments

A coroutine is a function that you can jump back into after returning from it - and it remembers where it was in the code, and all the variables. This is very useful at times.

One use is generating a sequence of values. Here's how you can generate all the x,y pairs in a 2D range in Python:

def iterate(max_x, max_y): for x in range(max_x): for y in range(max_y): yield x,y for x,y in iterate(2,2): print x,y

This prints:

0 0 0 1 1 0 1 1

The yield keyword is like...


StrangeCPU #1. A new CPU

Victor Yurkovsky February 24, 20136 comments

Summary: In this multi-part series I will share with you a design, implementation notes and code for a slightly different kind of a CPU featuring a novel token machine that resolves an 8-bit token to pretty much any address in a 32-bit or even 64-bit address space, using not much more than an adder.

Table of Contents:
  • Part 1: A new CPU - technology review, re-examination of the premises;  StrangeCPU concepts; x86 notes.

2022 Embedded Online Conference - Final Push!

Stephane Boucher April 8, 2022

With the Embedded Online Conference only a couple of weeks away, we are now doing a final push to ensure that as many engineers as possible who could benefit from the conference are aware of it. 

If you'd like to help us spread the word, not only will you make our day, but you'll also earn a chance to win one of TWO Saleae Logic Pro 8.     

Prize: TWO Saleae Logic Pro 8Raffle...

The 2021 DSP/ML Online Conference

Stephane Boucher September 29, 2021

The 2021 DSP/ML Online Conference is just around the corner and this year again, the program is packed with opportunities to learn. 

By registering for the conference, not only will you have full access to all talks, workshops, and Q&A sessions at this year's event, but you'll also gain instant access to all talks from last year's edition.  

We've asked the speakers to tell me a few words about their sessions, here are some of the answers we've...


Embedded Online Conference 2021 - Watch the Speakers Share their Thoughts on the Value for Attendees

Stephane Boucher May 4, 20212 comments

Over the last few weeks, we've had a chance to chat with some of the speakers at the upcoming Embedded Online Conference.  We asked them to share their thoughts on conferences and the Embedded Online Conference in particular.  Here are their answers edited together in one video:

  

If you are not registered yet for the conference but are considering it, please make sure to use the promo code ER149 to save more than 40% on your registration...


8 Weeks - 8 Giveaways!

Stephane Boucher March 10, 2021

If for some reason, you've been putting off registering for the upcoming 2021 Embedded Online Conference, here are 8 good reasons to register today.

The idea is simple; if you are registered for the conference by the 'raffle date' for any of the following giveaways, you'll automatically be entered into the draw.

So for instance, if you are already registered for the conference or register before March the 22nd, you'll be automatically entered into the 8 draws...


Announcing the 2021 Embedded Online Conference!

Stephane Boucher January 27, 20211 comment

Once again this year, Jacob Beningo and I are putting together the Embedded Online ConferenceLast year's edition was a very rewarding experience, with over 6,000 registrants, fantastic & insightful talks, and lots of positive feedback.  For this year's edition, we are delighted to announce that none other than Jack Ganssle will be giving a Keynote presentation about the 50th anniversary of the Microprocessor.

The 2021 Embedded Online Conference will...


The DSP Online Conference - Right Around the Corner!

Stephane Boucher September 20, 2020

It is Sunday night as I write this blog post with a few days to go before the virtual doors of the very first DSP Online Conference open..

It all started with a post in the DSPRelated forum about three months ago.  We had just had a blast running the 2020 Embedded Online Conference and we thought it could be fun to organize a smaller event dedicated to the DSP community.  So my goal with the post in the forum was to see if...


Already 3000+ Attendees Registered for the Upcoming Embedded Online Conference

Stephane Boucher February 14, 2020

Chances are you already know, through the newsletter or banners on the Related sites, about the upcoming Embedded Online Conference.

Chances are you also already know that you have until the end of the month of February to register for free. 

And chances are that you are one of the more than 3000 pro-active engineers who have already registered.

But If you are like me and have a tendency to do tomorrow what can be done today, maybe you haven't registered yet.  You may...


Free Goodies from Embedded World - Full Inventory and Upcoming Draw Live-Streaming Date

Stephane Boucher March 22, 20191 comment

Chances are that you already know that I went to Embedded World a few weeks ago and came back with a bag full of "goodies".  Initially, my vision was to do a single draw for one person to win it all, but I didn't expect to come back with so much stuff and so many development kits.   Based on your feedback, it seems like you guys agree that It wouldn't make sense for one person to win everything as no-one could make good use of all the boards and there would be lots of...


Free Goodies from Embedded World - What to Do Next?

Stephane Boucher March 6, 20193 comments

I told you I would go on a hunt for free stuff at Embedded World in order to build a bundle for someone to win.


Back from Embedded World 2019 - Funny Stories and Live-Streaming Woes

Stephane Boucher March 1, 20191 comment

When the idea of live-streaming parts of Embedded World came to me,  I got so excited that I knew I had to make it happen.  I perceived the opportunity as a win-win-win-win.  

  • win #1 - Engineers who could not make it to Embedded World would be able to sample the huge event, 
  • win #2 - The organisation behind EW would benefit from the extra exposure
  • win #3 - Lecturers and vendors who would be live-streamed would reach a (much) larger audience
  • win #4 - I would get...