# ARMmbed/DAPLink

Repository: https://github.com/ARMmbed/DAPLink
Canonical: https://ross.abutalabs.com/products/daplink
Homepage: https://daplink.io
Language: C
License: Apache-2.0
License Family: permissive
Topics: embedded, cortex-m, arm, mcu, debug, cmsis-dap, microcontroller, firmware, mbed
Last push: 2026-08-20T23:24:18+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 8, longevity 100
- inputs: {"age_days": 4357, "days_push": 13, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2793, forks 1098 (observed 2026-08-28T04:07:22.270560+00:00)

## What it is
Arm Mbed DAPLink is open-source interface firmware that runs on a secondary MCU attached to the SWD/JTAG port of an Arm Cortex application MCU, bridging the debug computer and target CPU over USB. It provides drag-and-drop flash programming (MSC), a virtual serial port (CDC), and CMSIS-DAPv1/v2 debug channels.

## Use cases
- flash firmware onto arm cortex microcontrollers by drag and drop
- debug cortex-m mcu over swd with cmsis-dap
- build custom debug probe firmware for a development board
- get a virtual serial port terminal on an embedded dev board
- update interface firmware on opensda or lpc-link2 debuggers

## When to choose
- you need CMSIS-DAP compliant debug firmware for an Arm Cortex target
- you want drag-and-drop MSC flashing plus serial and debug over one USB device
- you are building or customizing a debug probe on supported HIC hardware like MCU-LINK, OpenSDA, or LPC-Link2

## When to avoid
- you need a debugger for non-Arm architectures like RISC-V or AVR
- you want a host-side debugging tool rather than probe firmware (use pyOCD or OpenOCD instead)
- your debug probe hardware is not among the supported interface circuits

## Facets
- artifact type: application
- maturity: active
- function: embedded, developer-tools, security
- domain: embedded-systems, hardware, developer-tools
- platform: embedded, windows, cross-platform
- tags: debug-probe, cmsis-dap, interface-firmware, swd, jtag, flash-programming, arm-cortex, usb-composite, macos, linux

## Member repositories
- ARMmbed/DAPLink (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:22.270560+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 2026-08-30T08:31:45.220810+00:00, confidence not recorded.
  - readme: https://github.com/ARMmbed/DAPLink (fetched 2026-08-28T04:07:22.270560+00:00, sha e2dbbd3e05b2)
  - homepage: https://daplink.io (fetched 2026-08-29T09:54:55.884226+00:00, sha 1d9a533d34ce)
- Data as of 2026-08-30T08:39:29.467469+00:00.