Software Development

724 Articles

Writing An OLED Display Driver In MicroZig

March 8, 2025 by 18 Comments

Although most people would use C, C++ or MicroPython for programming microcontrollers, there are a few more obscure options out there as well, with MicroZig being one of them. Recently [Andrew Conlin] wrote about how to use MicroZig with the Raspberry Pi RP2040 MCU, showing the process of writing an SSD1306 OLED display driver and running it. Although MicroZig has since published a built-in version, the blog post gives a good impression of what developing with MicroZig is like.

Zig is a programming language which seeks to improve on the C language, adding memory safety, safe pointers (via option types), while keeping as much as possible of what makes C so useful for low-level development intact. The MicroZig project customizes Zig for use in embedded projects,  targeting platforms including the Raspberry Pi MCUs and STM32.  During [Andrew]’s usage of MicroZig it was less the language or supplied tooling that tripped him up, and more just the convoluted initialization of the SSD1306 controller, which is probably a good sign. The resulting project code can be found on his GitHub page.

Screenshot of the REPL running on the Flipper, importing the flipper API library and calling infrared receive function out of it with help of autocomplete

A MicroPython Interpreter For Flipper Zero

March 3, 2025 by 13 Comments

Got a Flipper Zero? Ever wanted to use a high-level but powerful scripting language on it? Thanks to [Oliver] we now have a MicroPython application for the Flipper, complete with a library for hardware and software feature support. Load it up, start it up, connect over USB, and you’ve got the ever-so-convenient REPL at your disposal. Or, upload a Python script to your Flipper and run them directly from Flipper’s UI at your convenience!

In the API docs, we’re seeing support for every single primitive you could want – GPIO (including the headers at the top, of course), a healthy library for LCD and LCD backlight control, button handling, SD card support, speaker library for producing tones, ADC and PWM, vibromotor, logging, and even infrared transmit/receive support. Hopefully, we get support for Flipper’s wireless capabilities at some point, too!

Check out the code examples, get the latest release from the Flipper app portal or GitHub, load it up, and play! Mp-flipper has existed for the better half of a year now, so it’s a pretty mature application, and it adds quite a bit to Flipper’s use cases in our world of hardware hacking. Want to develop an app for the Flipper in Python or otherwise? Check out this small-screen UI design toolkit or this editor we’ve featured recently!

Learn Assembly The FFmpeg Way

February 23, 2025 by 26 Comments

You want to learn assembly language. After all, understanding assembly unlocks the ability to understand what compilers are doing and it is especially important for time-critical code. But most tutorials are — well — boring. So you can print “Hello World” super fast. Who cares?

But decoding video data is something where assembly can really pay off, so why not study a real project like FFmpeg to see how they do things? Sounds like a pain, but thanks to the FFmpeg asm-lessons repository, it’s actually quite accessible.

According to the repo, you should already understand C — especially C pointers. They also expect you to understand some basic mathematics. Most of the FFmpeg code that uses assembly uses the single instruction multiple data (SIMD) opcodes. This allows you to do something like “add 5 to these 200 data items” very quickly compared to looping 200 times.

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Demonstration of the multichannel design feature, being able to put identical blocks into your design, only route one of them, and have all the other blocks' routing be duplicated

KiCad 9 Moves Up In The Pro League

February 22, 2025 by 28 Comments

Do you do PCB design for a living? Has KiCad been just a tiny bit insufficient for your lightning-fast board routing demands? We’ve just been graced with the KiCad 9 release (blog post, there’s a FOSDEM talk too), and it brings features of the rank you expect from a professional-level monthly-subscription PCB design suite.

Of course, KiCad 9 has delivered a ton of polish and features for all sorts of PCB design, so everyone will have some fun new additions to work with – but if you live and breathe PCB track routing, this release is especially for you.

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A New 8-bit CPU For C

February 21, 2025 by 60 Comments

It is easy to port C compilers to architectures that look like old minicomputers or bigger CPUs. However, as the authors of the Small Device C Compiler (SDCC) found, pushing C into a typical 8-bit CPU is challenging. Lessons learned from SDCC inspired a new 8-bit architecture, F8. This isn’t just a theoretical architecture. You can find an example Verilog implementation in the SDDC project and on GitHub. The name choice may turn out to be unfortunate as there was an F8 CPU from Fairchild back in the 1970s that apparently few people remember.

In the video from FOSDEM 2025, [Phillip Krause] provides a nice overview of the how and why of F8. While it might seem odd to create a new 8-bit CPU when you can get bigger CPUs for pennies, you have to consider that 8-bit machines are more than enough for many jobs, and if you can squeeze one into an FPGA, it might be a good choice as opposed to having to get a bigger FPGA to hold your design and a 32-bit CPU.

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Homebrew CPU Gets A Beautiful Rotating Cube Demo

February 19, 2025 by 10 Comments

[James Sharman] designed and built his own 8-bit computer from scratch using TTL logic chips, including a VGA adapter, and you can watch it run a glorious rotating cube demo in the video below.

The rotating cube is the product of roughly 3,500 lines of custom assembly code and looks fantastic, running at 30 frames per second with shading effects from multiple light sources. Great results considering the computing power of his system is roughly on par with vintage 8-bit home computers, and the graphics capabilities are limited. [James]’s computer uses a tile map instead of a frame buffer, so getting 3D content rendered was a challenge.

The video is about 20 seconds of demo followed by a detailed technical discussion on how exactly one implements everything required for a 3D cube, from basic math to optimization. If a deep dive into that sort of thing is up your alley, give it a watch!

We’ve featured [James]’ fascinating work on his homebrew computer before. Here’s more detail on his custom VGA adapter, and his best shot at making it (kinda) run DOOM.

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Get Ready For KiCAD 9!

February 17, 2025 by 58 Comments

Rev up your browsers, package managers, or whatever other tool you use to avail yourself of new software releases, because the KiCAD team have announced that barring any major bugs being found in the next few hours, tomorrow should see the release of version 9 of the open source EDA suite. Who knows, depending on where you are in the world that could have already happened when you read this.

Skimming through the long list of enhancements brought into this version there’s one thing that strikes us; how this is now a list of upgrades and tweaks to a stable piece of software rather than essential features bringing a rough and ready package towards usability. There was a time when using KiCAD was a frustrating experience of many quirks and interface annoyances, but successive versions have improved it beyond measure. We would pass comment that we wished all open source software was as polished, but the fact is that much of the commercial software in this arena is not as good as this.

So head on over and kick the tires on this new KiCAD release, assuming that it passes those final checks. We look forward to the community’s verdict on it.