Worlds Simplest Bootloader :: Bare Metal Programming Series 4 @LowByteProductions

Uploaded April 2023 | Updated September 2026, 2 weeks ago

In this episode of the bare metal programming series, we're taking our first steps into building a fully fledged bootloader! To do this, we need to split the application in two, build some supporting scripts, learn how to use linker scripts, and understand some of the internal CPU registers for relocating the interrupt vector table at runtime.

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🎥 Series Playlist: youtube.com/playlist?list=PLP29wDx6QmW7HaCrRydOnxcy8QmW0SNdQ
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Worlds Simplest Bootloader :: Bare Metal Programming Series 4

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$Fixed-point math is better than floating point (sometimes) In this video, were learning about fixed-point: A different method for doing non-integer arithmetic without floats! Floating point is a ubiquitous standard that works everywhere, but it needs specialised hardware to have any chance of running fast. This can make calculations on low-powered microcontrollers extremely expensive. Fixed-point solves, giving us a method for cheaply computing fractional results with flexible precision! 00:00:00 Intro 00:03:46 Floating point vs fixed point 00:10:07 Fixed point bit representation 00:17:10 Code: Fixed point defines 00:21:30 Getting to the integer and fractional parts 00:24:24 Sign function and representing ints in fixed point 00:32:14 Converting to and from floating point 00:36:23 Addition and subtraction 00:38:27 Multiplication 00:42:20 Division 00:48:52 Rounding operations 00:50:14 Absolute value 00:54:50 Floor 00:58:57 Getting the fractional part 01:02:38 Ceiling 01:05:37 Round 01:14:14 Motivating example: Analog to digital converter readings 01:30:10 Next time: Sines and cosines =[ 🔗 Links 🔗 ]= ⭐️ Become a patron and get bonus videos! https://www.patreon.com/lowleveljavascript 🗣 Discord: https://discord.gg/FPWaVgk 💻 Github Repo: https://github.com/lowbyteproductions/fixed-point-math$

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