# klonyyy/MCUViewer

Real-time embedded variable & trace viewer

Repository: https://github.com/klonyyy/MCUViewer
Canonical: https://ross.abutalabs.com/products/mcuviewer
Language: C
License: GPL-3.0
License Family: copyleft
Topics: debugger, real-time, stlink, stm32, stmstudio, analyzer, cubemonitor, logger, trace
Last push: 2026-06-24T16:12:16+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 89, release rhythm 78, longevity 93
- inputs: {"age_days": 1305, "days_push": 70, "days_rel": 70, "gap_med": 41, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1477, forks 181 (observed 2026-08-28T04:04:50.455060+00:00)

## What it is
MCUViewer (formerly STMViewer) is a GUI debug tool for microcontrollers with a Variable Viewer for real-time reading and logging of global variables over SWD and a Trace Viewer for visualizing SWO trace output. It requires only an STLink or JLink probe and reads variable addresses from the project's ELF file.

## Use cases
- visualize embedded variables in real time without adding debug code
- log variable data from an STM32 over SWD
- profile function execution time using SWO trace
- verify timer interrupt frequency on a Cortex-M microcontroller
- plot high-frequency signals from a microcontroller
- debug release builds without optimization interference

## When to choose
- you develop STM32 or other Cortex-M firmware and use STLink/JLink
- you need non-intrusive real-time variable inspection via debug interface
- you want SWO trace visualization for profiling or timing analysis

## When to avoid
- you need a fully open-source tool going forward, since the project is now closed-source
- your target lacks Cortex-M3/M4/M7/M33 trace peripherals for SWO tracing
- you debug over UART or other non-SWD interfaces

## Facets
- artifact type: application
- maturity: maintenance
- function: monitoring, logging, data-visualization, developer-tools
- domain: embedded-systems, developer-tools, hardware
- platform: windows, cross-platform
- tags: debugger, stm32, swd, swo-trace, stlink, jlink, embedded-debugging, real-time-plotting, gui, linux, desktop

## Member repositories
- klonyyy/MCUViewer (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:50.455060+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:34:24.635699+00:00, confidence not recorded.
  - readme: https://github.com/klonyyy/MCUViewer (fetched 2026-08-28T04:04:50.455060+00:00, sha e922a1ffe18d)
- Data as of 2026-08-30T08:39:29.467469+00:00.