The worlds most convoluted spirograph

In this video, we're dipping our toes into the world of DSP, and learning about how to interpret the output of the worlds most important algorithm: The fast fourier transform. By building an understanding of all the component parts, we can understand exactly how this...

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Fixed-point math is better than floating point (sometimes)

In this video, we're learning about fixed-point: A different method for doing non-integer arithmetic without floats! Floating point is a ubiquitous standard that works everywhere, but it needs specialised hardware to have any chance of running fast. This can make calculations...

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Rendering 3D Graphics On An Oscilloscope

In this video, we're learning how to draw on an oscilloscope. By utilising the X-Y mode of the scope, combined with some clever firmware to generate the right signals, and a sprinkle of DIY digital-to-analog conversion, we can render animated 3D graphics on a scope in real...

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Using LEDs As Precise GPIOs

In this video, we're looking at a technique for precisely analyzing signals from firmware when all you can do is blink a LED. By writing to an LED as if it were a typical GPIO, and building a surprisingly simple receiver, we can probe signals with an oscilloscope without even...

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Bad Apple 🍎 #stm32 #led #ws2812b

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Bare Metal Bit Banging: WS2812B Driver

In this video, we examine the WS2812B RGB LED device, and write a bit-banged driver from scratch for an STM32 microcontroller. Chapters 00:00 What is a WS2812 / NeoPixel 02:33 Hardware overview 06:00 What is a "device driver"? 08:35 The signalling protocol 15:00 Reviewing the...

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Spinning Persistence of Vision

The letters are distorted because the outside of a circle spins faster than the inside. There is currently no syncing to the frequency of rotation, which is why the text processes.

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Getting up in another processes memory

In this video, we learn how we can read memory belonging to other processes by building a memory dumper from scratch. One of the key components is the /proc file system: an interface that the kernel provides for introspecting processes. Combined with ptrace, a system call...

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The mechanics of VIRTUAL MEMORY //Source Dive// 005

In this installment of //Source Dive//, we're back in xv6, learning how address translation works with the virtual memory subsystem. =[ 🔗 Links 🔗 ]= more in depth talk: https://youtu.be/dFIqNZ8VbRY?si=ZGKcZRex96AUtwlT 🐋 RISC-V Docker Image:...

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Turning Pixels Into Waves

In this video, we're building an awesome graphical effect, where an image is processed into a series of animated waves. The math behind the technique is fascinating, and will lead us into to how sine waves work, the magic of linear interpolation, and signal processing...

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How does KERNEL memory allocation work? //Source Dive// 004

In this installment of //Source Dive//, we're deep in the xv6 operating system, trying to understand how physical memory of the system is tracked, distributed, and returned to the kernel. It's a fascinatingly simple algorithm, which can be paradoxically kind of hard to...

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Virtual Console and printf() //Source Dive// 003

In this installment of //Source Dive//, we're back in xv6, looking at how the operating system layers abstractions. The "console" is a great example, with a low-level driver rooted in the hardware, to an abstract console, to the printf function that eventually outputs...

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Programmatic Painting: Flow Fields

In this video, we're drawing generative art in the form of flow fields! Flow fields are mathematical structures where every point of a space is associated with an angle, and by carefully choosing those angles, we can trace out the path of particles moving across the field,...

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What is a spinlock? //Source Dive// 002

In this installment of //Source Dive//, we're back in the xv6 OS codebase, exploring timers, the early boot process, and a very useful concurrency primitive: The Spinlock! =[ 🔗 Links 🔗 ]= 🐋 RISC-V Docker Image:...

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How does an OS boot? //Source Dive// 001

In this installment of //Source Dive//, we're learning about the xv6 Operating System; Specifically the low-level boot code that gets the CPU in the correct state to run the OS! =[ 🔗 Links 🔗 ]= 🐋 RISC-V Docker Image:...

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