https://pranav083.github.io/tags/embedded-systems/Recent content in Embedded Systems on Pranav KumarHugo -- gohugo.ioenCopyright © 2016–2030, Pranav KumarTue, 06 May 2025 00:00:00 -0400https://pranav083.github.io/post/project/rtos-scheduling-protocols/Tue, 06 May 2025 00:00:00 -0400https://pranav083.github.io/post/project/rtos-scheduling-protocols/ <p><strong>ECE 5550G — Advanced Real-Time Systems · Virginia Tech · Spring 2025</strong></p> <p>A four-project sequence building real-time scheduling infrastructure inside FreeRTOS on STM32 hardware, working up from task primitives to resource-sharing protocols that bound priority inversion.</p> <hr> <h2 id="why-this-matters">Why this matters</h2> <p>FreeRTOS gives you preemptive fixed-priority scheduling and mutexes. It does <em>not</em> give you periodic task abstractions, deadline tracking, or the protocols that make shared resources safe under hard real-time constraints. Those you build — and building them is how the theory stops being theory.</p>https://pranav083.github.io/post/stepper_stspin220/Sun, 20 Dec 2020 00:00:00 +0530https://pranav083.github.io/post/stepper_stspin220/ <p><strong>Open source · C++ / Arduino · <a href="https://github.com/pranav083/Stepper_STSPIN220-library">github.com/pranav083/Stepper_STSPIN220-library</a></strong></p> <p>An Arduino library for STMicroelectronics' <a href="https://www.st.com/resource/en/datasheet/stspin220.pdf">STSPIN220</a> low-power stepper driver. It is my most-used piece of open-source work.</p> <hr> <h2 id="why-it-exists">Why it exists</h2> <p>The STSPIN220 can microstep down to <strong>1/256 of a full step</strong> — fine enough for 3D printers, camera slides, and any application where audible stepping or positional granularity matters.</p> <p>Existing Arduino stepper libraries treated the driver as a step-and-direction black box, leaving the microstepping mode fixed in hardware. That throws away the part of the chip that makes it interesting.</p>