cellularmitosis

Jason Pepas' Technical Blog

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• A Lisp interpreter in C: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, [11

cellularmitosis

Factorio notes

Some notes on the game Factorio.

Pre-belt Engineering

Red Science

Stage 1:

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Blog 2020/9/30

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Basic Zener diode voltage regulator

Let's simulate a zener diode voltage regulator using LTspice.

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a.out: sudoku.c
	gcc -std=c89 -Wall -Werror -Os sudoku.c -o a.out

ccbench:
	@cat /proc/cpuinfo | grep 'model name' | head -n1
	@tcc -v || true
	@gcc --version | head -n1
	@echo
	@tcc sudoku.c
	time tcc sudoku.c 2>&1 && mv a.out a.out.tcc

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SDL=$(shell sdl-config --cflags --libs)

default: snake run

run: snake
	./snake

snake: snake.c
	gcc -std=c99 -Wall -Werror -O2 $(SDL) snake.c -o snake

cellularmitosis

Here is a script I use to crop out 64x64 item icons from the Factorio icon mini-sprite-sheet png's.

cellularmitosis

Blog 2022/9/26

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"EZOFF": Easy offsets and keepouts for Marlin firmware

The Marlin 3D printer firmware project has support for setting travel limits:

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import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        let window = UIWindow(frame: UIScreen.main.bounds)

cellularmitosis

Blog 2019/9/1

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Matching a string literal using regex

When implementing a regex-based lexer / tokenizer, coming up with a regex which matches string literals can be a bit tricky.

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Blog 2020/4/19

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Trivial rect filling SDL2 benchmark in Golang and Python

I threw together a few trivial benchmarks to compare the rect filling performance of golang vs. python.