Memfault Micrium OS (uC/OS-III) Sample

A minimal Micrium OS application running on QEMU (ARM Cortex-M3, MPS2-AN385), integrated with the Memfault Firmware SDK for coredump capture, metrics, and reboot tracking.

Uses the Micrium OS kernel from Silicon Labs' Simplicity SDK (sisdk-2025.6).

Prerequisites

• arm-none-eabi-gcc toolchain
• git (the Simplicity SDK is fetched automatically on first build)
• qemu-system-arm (optional, for running)

Building

git submodule update --init
make

The Simplicity SDK is sparse-cloned automatically into simplicity_sdk/ on first build. To use an existing checkout instead:

make SISDK_DIR=/path/to/simplicity_sdk

Output ELF: build/qemu_mps2_an385/main.elf

Running on QEMU

make run

The Memfault demo shell is available over the QEMU serial console. Type help for available commands, or assert to trigger a crash and capture a coredump.

Project Structure

├── Makefile                  # Build system
├── memfault-firmware-sdk/    # Memfault SDK (submodule)
├── boards/qemu_mps2_an385/  # Board support (startup, linker, platform impl)
├── src/                      # Application code
│   ├── main.c                # Entry point, task creation
│   ├── console.c             # CLI task (Memfault demo shell)
│   ├── metrics.c             # Heartbeat metrics task
│   ├── os_cfg.h              # Micrium OS kernel config
│   └── memfault/             # Memfault platform port
└── stubs/                    # Shims for Silabs platform dependencies on QEMU