CastrLabhttps://castrlab-blowfish-244231.gitlab.io/posts/Recent content on CastrLabHugo -- gohugo.ioenluke@castrlab.com (Luke Paulson)luke@castrlab.com (Luke Paulson)© 2026 Luke PaulsonSat, 27 Jun 2026 00:00:00 +0000I spent a day debugging a buffer doing its jobhttps://castrlab-blowfish-244231.gitlab.io/posts/drifting-difference/Sat, 27 Jun 2026 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/drifting-difference/My ADC read random, noisy values run to run; there was no bug — with the high-impedance buffer enabled and nothing connected, I was watching input bias current charge the amplifier’s input impedance.Good Enough to Move On: Patching an ADS1255 Driver.https://castrlab-blowfish-244231.gitlab.io/posts/ads1255-driver-v1/Wed, 24 Jun 2026 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/ads1255-driver-v1/I started from someone else’s ADS1255 driver, fixed the original’s mistakes and a few of my own, added some quality-of-life features, and stopped the moment it was good enough to get back to testing the ADC.Rev 1: a curated set of mistakeshttps://castrlab-blowfish-244231.gitlab.io/posts/adc-dev-r1/Mon, 11 May 2026 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/adc-dev-r1/Rev 1 of my ADC noise project has one deliberate mistake, a couple of knobs to turn later, and best practice everywhere else — here’s what’s on the board and why.Framework Serial Shellhttps://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-shell/Sat, 01 Mar 2025 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-shell/Building a shell on STM_Shell for the Framework module — what the library gave me, what I had to add for arrow keys and line editing, and the ringbuffer bug that has the project on hold.Framework Serial: Rebuilding Around an STM32https://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-v2/Tue, 07 May 2024 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-v2/Second pass at the Framework bus tool, replacing the bridge IC with an STM32 to push the user interface into firmware and kill the host-software problem.Accessing USB Connected Hardware Through WSLhttps://castrlab-blowfish-244231.gitlab.io/posts/accessing-usb-hardware-through-wsl/Wed, 18 Jan 2023 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/accessing-usb-hardware-through-wsl/Setting up usbipd and a few helper scripts to make USB devices reachable from inside WSL, with auto-reconnect when the link dropsFramework Serial: A USB-Serial Bridge with Programmable IO Levelshttps://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-v1/Sat, 26 Mar 2022 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/framework-serial-v1/First attempt at the Framework bus tool — a clever power topology around a single bridge IC, undone by a software architecture I should have seen coming.Approximating Planar Inductorshttps://castrlab-blowfish-244231.gitlab.io/posts/approximating-planar-inductors/Wed, 30 Sep 2020 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/approximating-planar-inductors/A validation test to compare different planar inductor approximation methods.AVR Cross-Platform Development with Ceedlinghttps://castrlab-blowfish-244231.gitlab.io/posts/avr-ceedling-cross-platform-development/Sat, 01 Aug 2020 00:00:00 +0000luke@castrlab.com (Luke Paulson)https://castrlab-blowfish-244231.gitlab.io/posts/avr-ceedling-cross-platform-development/Taking a closer look at the Ceedling configuration file to assist with cross-platform development.