Kasia ZalewskaMy blog about embedded systems. Personal thoughts, experiments, and notes on RTOS, ARM microcontrollers, and programminghttps://kasia0x01.github.io/Blinking an LED on Arduino Uno R4 using direct register accesshttps://kasia0x01.github.io/posts/2026/arduino-blink-led-without-digitalwrite/https://kasia0x01.github.io/posts/2026/arduino-blink-led-without-digitalwrite/Skip Arduino libraries and blink an LED on Arduino Uno R4 using direct registers access. We'll read RA4M1 datasheet and configure a GPIO pin manually.Wed, 25 Feb 2026 07:58:26 GMTReal Embedded Systems: Mastering the ARM Cortex-M4 using Arduino R4https://kasia0x01.github.io/posts/2025/arduino-the-hard-way/https://kasia0x01.github.io/posts/2025/arduino-the-hard-way/Master professional embedded systems with the ARM Cortex-M4 (RA4M1). Go beyond the Arduino API: learn registers, RTOS, and bare-metal coding on the Arduino UNO R4.Tue, 24 Feb 2026 07:58:26 GMTAutomating the Arduino build process: Arduino CLI and Makefileshttps://kasia0x01.github.io/posts/2025/arduino-cli-compilation/https://kasia0x01.github.io/posts/2025/arduino-cli-compilation/Moving away from the Arduino IDE to the terminal. A practical guide on using Arduino CLI and Makefiles to handle compilation and build automation for a more efficient embedded workflow.Tue, 24 Feb 2026 07:58:26 GMTReverse engineering the Arduino build process: from a sketch to a binaryhttps://kasia0x01.github.io/posts/2025/arduino-ide-build-process/https://kasia0x01.github.io/posts/2025/arduino-ide-build-process/Let's stop pretending that Arduino sketches are magic written in Arduino language. I'm reverse engineering the Arduino build process, showing the common C/C++ build steps and Arduino specific additions.Fri, 20 Feb 2026 07:58:26 GMTRunning Zephyr RTOS on Arduino UNO R4 WiFihttps://kasia0x01.github.io/posts/2026/running-zephyr-on-arduino-uno-r4/https://kasia0x01.github.io/posts/2026/running-zephyr-on-arduino-uno-r4/Turn your ARM-based Arduino board into a high-performance, secure and professional hardware by running Zephyr RTOS on it.Mon, 26 Jan 2026 07:58:26 GMTResources for learning embedded systemshttps://kasia0x01.github.io/posts/2025/resources/https://kasia0x01.github.io/posts/2025/resources/Learning resources covering embedded systems, ARM microcontrollers, and C and C++ programming topics.Tue, 30 Dec 2025 03:04:49 GMTcmake-init: the best way to kick off a new C or C++ projecthttps://kasia0x01.github.io/posts/2025/cmake-init/https://kasia0x01.github.io/posts/2025/cmake-init/If you're tired of setting up the same boilerplates for testing, CI/CD, and linting every time you start a new repo, you should probably just use cmake-init tool.Sat, 20 Dec 2025 07:58:26 GMTAdding CI/CD to Arduino projects: Github Actions and Wokwi simulationhttps://kasia0x01.github.io/posts/2025/arduino-github-actions-with-wokwi/https://kasia0x01.github.io/posts/2025/arduino-github-actions-with-wokwi/Learn how to automate your Arduino projects using GitHub Actions and Wokwi. This guide shows you how to set up a CI/CD pipeline for automated builds and simulations.Tue, 18 Nov 2025 07:58:26 GMT