Market leading RTOS (Real Time Operating System) for embedded systems with Internet of Things extensions. Real-time operating system for microcontrollers?

Developed in partnership with the world’s leading chip companies over an 18-year period, and now downloaded every 170 seconds, FreeRTOS is a market-leading real-time operating system (RTOS) for microcontrollers and small microprocessors. Distributed freely under the MIT open source license, FreeRTOS includes a kernel and a growing set of IoT libraries suitable for use across all industry sectors. FreeRTOS is built with an emphasis on reliability and ease of use.

PULPino is an open-source microcontroller system, based on a small 32-bit RISC-V core developed at ETH Zurich. The core has an IPC close to 1, full support for the base integer instruction set (RV32I), compressed instructions (RV32C) and partial support for the multiplication instruction set extension (RV32M). It implements several ISA extensions such as: hardware loops, post-incrementing load and store instructions, ALU and MAC operations, which increase the efficiency of the core in low-power signal processing applications.

• Pulpino @ GitHub.

A lightweight, memory-protected, message-passing kernel for deeply embedded systems.

Hubris is an operating system for microcontrollers developed by Oxide Computer Company. We also have a blog post announcing Hubris on the Oxide blog.

Hubris provides preemptive multitasking, memory isolation between separately-compiled components, the ability to isolate crashing drivers and restart them without affecting the rest of the system, and flexible inter-component messaging that eliminates the need for most syscalls — in about 2000 lines of Rust. The Hubris debugger, Humility, allows us to walk up to a running system and inspect the interaction of all tasks, or capture a dump for offline debugging.

• Hubris @ GitHub.

Related contents:

• Episode #659: Voices of Oxide @ Changelog Interviews.