---
id: pylink-square
version: "2.0.1"
license: Apache 2.0
license_treatment: permissive
maintenance: active
---

# pylink-square — Python interface for SEGGER J-Link.

License: permissive · Maintenance: active · Downloads: 1.8M/mo

## What it is and what it does

pylink-square is a Python wrapper around the SEGGER J-Link native library, enabling programmatic control of J-Link debug probes from Python code. It abstracts the low-level C API into a Pythonic interface for tasks like connecting to embedded devices, flashing firmware, and resetting targets. The package depends on psutil and six for cross-platform compatibility and system introspection.

The library is designed for embedded systems developers and automation engineers who need to script J-Link operations—such as batch firmware deployment or integration into CI/CD pipelines. It requires the SEGGER J-Link Tools to be installed separately on the host system; pylink-square acts as a bridge between your Python code and that native toolchain.

Use it for:

- Automate firmware flashing across multiple embedded devices in a manufacturing or testing environment.
- Integrate J-Link operations into CI/CD pipelines for automated device testing and deployment.
- Build custom debugging or diagnostic tools that programmatically interact with ARM-based microcontrollers.
- Script device reset and connection sequences for batch testing or validation workflows.
- Create Python-based test harnesses that need to control J-Link probes without manual intervention.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides a Python interface to control SEGGER J-Link debug probes for embedded systems programming, including flashing firmware and device communication.

Yes. The package is actively maintained, has no known vulnerabilities, low install friction, and a permissive license. Install it if you need to automate or script SEGGER J-Link operations from Python. The main prerequisite is having SEGGER J-Link Tools >= 6.0b installed separately on your system; without that external dependency, the package cannot function.

## Install

pip install pylink-square
uv add pylink-square
poetry add pylink-square

## Installing pylink-square

Before you install: Low friction installation with only two lightweight runtime dependencies (psutil and six). Repository is actively maintained with recent commits and no known vulnerabilities.

License in practice: Licensed under Apache 2.0 (permissive), allowing commercial and private use with minimal restrictions; you must retain license notices in distributions.

Quickstart:

import pylink

jlink = pylink.JLink()
jlink.open('123456789')
jlink.connect('device', verbose=True)
jlink.flash(firmware, 0x0)
jlink.reset()

Requires SEGGER J-Link Tools >= 6.0b to be installed separately on your system; the native library (libjlinkarm.so/.dylib/JLinkARM.dll) must be discoverable via system library paths or explicitly configured.

Verify before relying:

- Whether the package works with Python versions between 3.0 and 3.7 (requires_python says >=3.0 but description says >=3.7)
- Current test coverage and whether functional tests are regularly run in CI
- Support status for J-Link Tools versions newer than 6.0b

## Package facts

- License: Apache 2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 1.8M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

j-link python interface, segger jlink control, embedded device flashing, debug probe automation, firmware programming tool, arm embedded debugging, jlink device connection, embedded-systems, hardware-debugging, automation

[View on SkillFed](https://skillfed.io/packages/pylink-square) · [View on PyPI](https://pypi.org/project/pylink-square/)