HobbyistCoder29 https://p.eertu.be/c/hobbyistcoder29/videos Videos of my programming projects. Mostly for Linux and Raspberry Pi. Focus is in fun and learning - not so much about making useful software. "Don't try this at work!" Tue, 07 Jul 2026 23:17:22 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://p.eertu.be HobbyistCoder29 https://p.eertu.be/lazy-static/avatars/4bd2d98e-3bc5-4090-83a8-4b9221c26d7a.png https://p.eertu.be/c/hobbyistcoder29/videos All rights reserved, unless otherwise specified in the terms specified at https://p.eertu.be/about and potential licenses granted by each content's rightholder. https://p.eertu.be/feeds/podcast/videos.xml?videoChannelId=30189 <![CDATA[This pinball game is not yet ready]]> https://p.eertu.be/w/b2rtvtRfBiutZ1uRA7kpvb https://p.eertu.be/w/b2rtvtRfBiutZ1uRA7kpvb Fri, 24 Sep 2021 20:13:33 GMT Development of this pinball game started about 10 years ago. I call it Flibu (derived from word flipper). This demo was created on Raspberry Pi 400 but it should work in any Linux.

Maybe it will be finished some day, or maybe not. The point obviously is not to publish a game, but to learn and have some fun.

Uses: Xlib, Xrender, libpng, libvorbis

]]> HobbyistCoder29 Science & Technology nonadult This pinball game is not yet ready Development of this pinball game started about 10 years ago. I call it Flibu (derived from word flipper). This demo was created on Raspberry Pi 400 but it should work in any Linux. Maybe it will be finished some day, or maybe not. The point obvio... <![CDATA[Simple fixed point math]]> https://p.eertu.be/w/w8NZdsLivQhnVPBW7WKk6X https://p.eertu.be/w/w8NZdsLivQhnVPBW7WKk6X Mon, 23 Aug 2021 19:18:11 GMT Demonstration of simple fixed point math in C.

]]> HobbyistCoder29 Science & Technology nonadult Simple fixed point math Demonstration of simple fixed point math in C. <![CDATA[wc - word count in ARM assembly]]> https://p.eertu.be/w/mFMHo2eyPqRqAMCEwPuAub https://p.eertu.be/w/mFMHo2eyPqRqAMCEwPuAub Sun, 15 Aug 2021 18:37:24 GMT Walkthrough of an assembly version of wc (see Linux manual page for the GNU version: https://man7.org/linux/man-pages/man1/wc.1.html).

Interacting with the OS requires to use 3 system calls: read(), write() and exit(). Formatting the results as 10-based numbers was maybe the trickiest part of this project.

Running on 32-bit Linux in Raspberry Pi 400.

This version is limited, supports only stdin. But it's faster! The default wc which is installed to my Pi needs 12 times more time to process 49MiB input.

]]> HobbyistCoder29 Science & Technology nonadult wc - word count in ARM assembly Walkthrough of an assembly version of wc (see Linux manual page for the GNU version: https://man7.org/linux/man-pages/man1/wc.1.html). Interacting with the OS requires to use 3 system calls: read(), write() and exit(). Formatting the results as 1... <![CDATA[Software plays Bach Invention 13]]> https://p.eertu.be/w/iXzLyHUdjT5syNnTKu37Gi https://p.eertu.be/w/iXzLyHUdjT5syNnTKu37Gi Sun, 15 Aug 2021 18:34:31 GMT Here my software plays a MIDI song - Bach Invention no 13 a minor BWV 784.

I had problems to capture real audio on my machine (Pi 400) so this video is slightly faked as the audio is taken separately (using a special rendering method) and looks a bit out of sync.

Midi file originally taken from:
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=59

]]> HobbyistCoder29 Science & Technology nonadult Software plays Bach Invention 13 Here my software plays a MIDI song - Bach Invention no 13 a minor BWV 784. I had problems to capture real audio on my machine (Pi 400) so this video is slightly faked as the audio is taken separately (using a special rendering method) and looks a... <![CDATA[Print program arguments in ARM assembly]]> https://p.eertu.be/w/xz1sDEAdaoU9BwU8B5S73N https://p.eertu.be/w/xz1sDEAdaoU9BwU8B5S73N Sun, 15 Aug 2021 18:02:27 GMT This is "args". It demonstrates accessing program arguments in ARM assembly (32-bit) in Linux.

]]> HobbyistCoder29 Science & Technology nonadult Print program arguments in ARM assembly This is "args". It demonstrates accessing program arguments in ARM assembly (32-bit) in Linux. <![CDATA[argc: my smallest project - 3 asm instructions]]> https://p.eertu.be/w/4NEctYB9VM9f9PzeES5Vet https://p.eertu.be/w/4NEctYB9VM9f9PzeES5Vet Sun, 15 Aug 2021 16:36:36 GMT Walk-through of my smallest software project, argc. It's done for Raspberry Pi 400 Linux using 32-bit ARM assembly.

Naturally this software is not meant to be actually used. But it's a real program and has zero bugs.

]]> HobbyistCoder29 Science & Technology nonadult argc: my smallest project - 3 asm instructions Walk-through of my smallest software project, argc. It's done for Raspberry Pi 400 Linux using 32-bit ARM assembly. Naturally this software is not meant to be actually used. But it's a real program and has zero bugs.