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‎index.html‎

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<div class="row row-cols-1 row-cols-lg-3 g-4">
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<a href="/posts/2025/10-24-pyocd-0.40.0-released.html">
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<a href="/posts/2025/12-16-pyocd-0.42.0-released.html">
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<div class="card h-100">
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<div class="card-body">
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<h5 class="card-title">pyOCD 0.40.0 released</h5>
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<p class="card-text">Introducing support for multiple concurrent GDB client connections to the same GDB server.</p>
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<h5 class="card-title">pyOCD 0.42.0 released</h5>
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<p class="card-text">Introducing a new `run` subcommand capable of running targets until a time limit or EOT.</p>
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</div>
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<div class="card-footer">
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<small class="">24 Oct 2025</small>
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<small class="">16 Dec 2025</small>
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</div>
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</div>
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</a>
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<a href="/posts/2025/07-04-pyocd-0.37.0-released.html">
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<a href="/posts/2025/10-24-pyocd-0.40.0-released.html">
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<div class="card h-100">
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<div class="card-body">
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<h5 class="card-title">pyOCD 0.37.0 released</h5>
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<p class="card-text">Introducing support for CMSIS-Toolbox Run and Debug Management.</p>
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<h5 class="card-title">pyOCD 0.40.0 released</h5>
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<p class="card-text">Introducing support for multiple concurrent GDB client connections to the same GDB server.</p>
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</div>
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<small class="">04 Jul 2025</small>
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<small class="">24 Oct 2025</small>
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</a>
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<a href="/posts/2022/01-24-pyocd-0.33.0-released.html">
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<a href="/posts/2025/07-04-pyocd-0.37.0-released.html">
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<div class="card h-100">
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<h5 class="card-title">pyOCD 0.33.0 released</h5>
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<p class="card-text">RTT, user-defined commands, color logging, and plenty of bug fixes.</p>
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<h5 class="card-title">pyOCD 0.37.0 released</h5>
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<p class="card-text">Introducing support for CMSIS-Toolbox Run and Debug Management.</p>
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</div>
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<div class="card-footer">
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<small class="">24 Jan 2022</small>
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<small class="">04 Jul 2025</small>
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‎posts/2025/12-16-pyocd-0.42.0-released.html‎

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<!DOCTYPE html>
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<link rel="stylesheet" href="/assets/styles/main.css">
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<title>pyOCD 0.42.0 released &mdash; pyOCD</title>
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<a class="nav-link" href="/docs/">Documentation</a>
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<div class="container flex-grow-1">
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<main role="main" class="content-scroll p-3 p-md-4">
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<p>&larr; <a href="/posts/">View all posts</a></p>
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<h1><a href="/posts/2025/12-16-pyocd-0.42.0-released.html">pyOCD 0.42.0 released</a></h1>
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<div class="post-header">
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<p class="text-muted border-bottom">
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<strong>Dec 16, 2025</strong>
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<br/>Teo Mahnic
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</p>
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</div>
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<p>Version 0.42.0 of pyOCD has been released and is available from PyPI. This release introduces a new subcommand,
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a number of improvements and bug fixes. The complete list is shown below.</p>
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<p>To upgrade pyOCD, just run <code class="highlighter-rouge">pip</code>:</p>
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<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>pip install --upgrade pyocd
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</code></pre></div></div>
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<p>The latest pyOCD release focuses on strengthening automation workflows, led by the introduction of the new
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<code class="highlighter-rouge">run</code> subcommand. This command enables time-limited or EOT-terminated execution, making it well suited for
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CI/CD environments that require deterministic behavior. It provides unified access to semihosting and SWV
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streams, offering consistent console output and optional input handling during automated runs.</p>
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<p>A new standard I/O routing layer refines how output is managed across cores. The framework consolidates
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routing logic and supports console, telnet, file, and disabled modes, creating a uniform mechanism that
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simplifies multi-core scenarios.</p>
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<p>Integration with <a href="https://open-cmsis-pack.github.io/cmsis-toolbox/YML-CBuild-Format/#run-and-debug-management">CMSIS-Toolbox Run and Debug Management</a>
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has also been strengthened. Configuration from <code class="highlighter-rouge">*.cbuild-run.yml</code> files now occupies a lower priority tier,
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sitting beneath command-line arguments and general session options to preserve explicit user intent.</p>
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<p>Additional improvements include new flash programming options, relaxed flash algorithm requirements,
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updated Zephyr RTOS thread state definitions, and expanded architecture support - most notably
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Cortex-M52 and Star-MC3 devices.</p>
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<p>Thanks again to all the contributors who helped make this release possible! ❤️</p>
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<p><a href="https://github.com/pyocd/pyOCD/releases/tag/v0.42.0">v0.42.0 on GitHub</a> <br />
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<a href="https://pypi.org/project/pyocd/0.42.0">v0.42.0 on PyPI</a></p>
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<hr />
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<h2 id="new-features">New Features</h2>
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<ul>
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<li><code class="highlighter-rouge">run</code> subcommand:
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<ul>
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<li>Introduce a new <code class="highlighter-rouge">run</code> subcommand capable of running targets until a time limit or EOT (suited for CI/CD workflows)</li>
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<li>Supports semihosting console output/input and SWV output</li>
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</ul>
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</li>
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</ul>
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<h2 id="improvements">Improvements</h2>
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<ul>
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<li>Standard I/O routing:
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<ul>
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<li>Add new abstraction layer to unify STDIO routing for each core</li>
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<li>Routing support for <code class="highlighter-rouge">console</code>, <code class="highlighter-rouge">telnet</code>, <code class="highlighter-rouge">file</code> and <code class="highlighter-rouge">off</code>
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<blockquote>
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<p>Note: Currently only output is supported</p>
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</blockquote>
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</li>
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</ul>
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</li>
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<li><a href="https://open-cmsis-pack.github.io/cmsis-toolbox/YML-CBuild-Format/#run-and-debug-management">CMSIS-Toolbox Run and Debug Management</a> integration:
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<ul>
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<li>Add configuration layer in session options, which sits below command line arguments</li>
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<li>Disable <code class="highlighter-rouge">*.cbuild-run.yml</code> processing if the <code class="highlighter-rouge">target_override</code> option is set</li>
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<li>Improve port assignment logic for multi-core GDBServer and telnet configurations</li>
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<li>Add processing for <code class="highlighter-rouge">connect</code> mode configuration</li>
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<li>Add processing for <code class="highlighter-rouge">pre-reset</code> and <code class="highlighter-rouge">post-reset</code> options in <code class="highlighter-rouge">load-setup</code> configuration</li>
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<li>Improve error messages for missing or invalid <code class="highlighter-rouge">*.cbuild-run.yml</code> file</li>
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<li>Improve checking for required files
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<ul>
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<li>Raise a warning instead of an error for missing SVD files</li>
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<li>Load SVD files only when available and when used by the subcommand</li>
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</ul>
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</li>
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</ul>
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</li>
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<li>Flash programming:
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<ul>
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<li>Add new session options for configuring <code class="highlighter-rouge">pre-reset</code> and <code class="highlighter-rouge">post-reset</code> type in <code class="highlighter-rouge">load</code> subcommand</li>
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<li>Relax flash algorithm requirement to require only RO section</li>
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</ul>
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</li>
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<li>RTOS:
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<ul>
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<li>Update Zephyr thread state definitions to match modern versions (@mathieuchopstm)</li>
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</ul>
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</li>
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<li>CoreSight and Cortex-M:
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<ul>
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<li>Add support for Cortex-M52 and Star-MC3 based devices (@Liu-Gu)</li>
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<li>Skip adding cores not described in the debug topology while retaining direct AP access</li>
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</ul>
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</li>
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</ul>
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<h2 id="fixes">Fixes</h2>
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<ul>
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<li>Cortex-M:
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<ul>
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<li>Fix incorrect reset type used in the fallback mechanism when the requested DebugSequence doesn’t exist</li>
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</ul>
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</li>
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<li>CMSIS-DAP:
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<ul>
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<li>Fix HID report sizing logic across platforms</li>
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</ul>
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</li>
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<li>CMSIS-Packs:
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<ul>
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<li>Correct path normalization inside pack archives to support <code class="highlighter-rouge">..</code> in file paths (@xoriath)</li>
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</ul>
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</li>
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</ul>
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<h2 id="other">Other</h2>
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<ul>
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<li>Minor documentation updates related to session option usage</li>
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</ul>
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<h2 id="new-contributors">New Contributors</h2>
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<ul>
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<li>@Liu-Gu made their first contribution in https://github.com/pyocd/pyOCD/pull/1852</li>
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<li>@mathieuchopstm made their first contribution in https://github.com/pyocd/pyOCD/pull/1823</li>
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<li>@xoriath made their first contribution in https://github.com/pyocd/pyOCD/pull/1867</li>
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</ul>
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<p><strong>Full Changelog</strong>: https://github.com/pyocd/pyOCD/compare/v0.41.0…v0.42.0</p>
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</main>
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Copyright &copy; 2021-2025 PyOCD Authors.
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</p>
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<p class="small">
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Site and docs are <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.<br/>
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Project code is <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0</a>.
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<div class="col-3"> <!-- mt-3 mb-3 mx-4 -->
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<h5>Links</h5>
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<a href="https://github.com/pyocd/pyOCD/blob/main/CONTRIBUTING.md">Contributing</a>
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<a href="https://github.com/pyocd/.github/blob/main/CODE_OF_CONDUCT.md">Code of Conduct</a>
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<a href="https://github.com/pyocd/">GitHub</a>
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<h5>Projects</h5>
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<ul class="list-unstyled">
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<a href="https://github.com/pyocd/pyOCD">pyOCD</a>
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<a href="https://github.com/pyocd/cmsis-pack-manager">cmsis-pack-manager</a>
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</li>
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<li>
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<a href="https://github.com/pyocd/FlashAlgo">FlashAlgo</a>
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</li>
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</ul>
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<h5>Community</h5>
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<a href="https://github.com/pyocd/pyOCD/issues">Issues</a>
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<a href="https://github.com/pyocd/pyOCD/discussions">Discussions</a>
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<a href="https://join.slack.com/t/pyocd/shared_invite/zt-zqjv6zr5-ZfGAXl_mFCGGmFlB_8riHA">Slack</a>
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<a href="https://groups.google.com/g/pyocd">Mailing list</a>
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‎posts/index.html‎

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<a href="/posts/2025/12-16-pyocd-0.42.0-released.html"><strong>16 Dec 2025</strong> pyOCD 0.42.0 released</a>
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<div><p>Introducing a new `run` subcommand capable of running targets until a time limit or EOT.</p></div>
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</li>
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<a href="/posts/2025/10-24-pyocd-0.40.0-released.html"><strong>24 Oct 2025</strong> pyOCD 0.40.0 released</a>
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<div><p>Introducing support for multiple concurrent GDB client connections to the same GDB server.</p></div>

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