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Andras Schmelczer 2022-09-21 13:16:03 +02:00
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src/data/ad-astra.ts
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import adAstraWebP from '../static/media/ad_astra.jpg?format=webp';
import adAstraJpeg from '../static/media/ad_astra.jpg?format=jpg';
import adAstraMp4 from '../static/media/mp4/ad_astra.mp4';
import adAstraWebM from '../static/media/webm/ad_astra.webm';
import { GitHub } from './shared';
import { Video } from '../page/basics/video/video';
export const adAstraTimelineElement = {
title: `Gaming on an ATtiny85`,
date: `2020 spring`,
figure: new Video({
posterWebP: adAstraWebP,
posterJpeg: adAstraJpeg,
mp4: adAstraMp4,
webm: adAstraWebM,
}),
description: `
A simple game engine with a sample game set in space. The greatest challenge was to overcome
the very limited resources of the hardware, this was also the most rewarding part.
`,
more: [
`
For reducing complexity while maintaining performance, a balance had to be found between object-oriented
and structural programming. For example, a simple prototype-based inheritance is used for the game objects;
meanwhile, an optimised SIMD utilising low-level driver is used for rendering to the display.
I think, the codebase is quite readable and at the same time also fast, with the maximum frame times
being between 15 and 20 milliseconds at a clock speed of 8 MHz. That means, it runs quite stably at 50-60 FPS.
`,
`
As for the hardware, it is quite simple. Aside from the ATtiny85V, a D096-12864-SPI7 display is used for
output and a TSOP4838 for input. The circuit runs on 3.3V, so a regulator is also needed. It uses a current
of 8mA to 11mA on full brightness and around 1.5mA on standby mode.
`,
`
There is also fault-tolerant persistent data storage utilising the built-in EEPROM.
For creating sprites (which are also stored in EEPROM), I made a tool to convert PNG-s into C array definitions.
This can also be found on GitHub along with the entire project.
`,
],
links: [new GitHub('https://github.com/schmelczerandras/ad_astra')],
};