pyocd/pyOCD

Health v2 · maintenance only

Adoption not part of the score

1449 stars · 556 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

pyOCD is an open-source Python library and command-line tool for programming and debugging Arm Cortex-M microcontrollers across a wide range of debug probes (CMSIS-DAP, ST-Link, J-Link, and more). It supports 70+ built-in devices plus nearly any Cortex-M target via CMSIS Device Family Packs, and offers a GDB server, flash programming, RTT/SWO streaming, and a Python API for automation.

Use cases

• flash firmware onto a Cortex-M microcontroller from the command line
• debug embedded firmware with gdb or an IDE like VS Code
• erase or program MCU flash in a CI pipeline
• inspect and control a microcontroller interactively from a Python REPL
• stream Segger RTT output over any debug probe
• share a debug probe over TCP/IP for remote debugging
• build custom automated test tools for embedded targets using the Python API

When to choose

• you need to program or debug Arm Cortex-M devices cross-platform from Python or the CLI
• you want GDB server support with many probe types (CMSIS-DAP, ST-Link, J-Link)
• you need scripted/automated flash programming and target control for CI or test tooling
• you want broad device support via Open-CMSIS-Pack

When to avoid

• you are debugging non-Cortex-M architectures such as Cortex-A/R or RISC-V
• you need a graphical flashing tool with no command-line involvement
• your probe is unsupported and no vendor driver plugin exists

Facets

library · maturity active

developer-tools cli sdk testing embedded-systems developer-tools hardware python windows cross-platform cli cortex-m arm debug-probe gdbserver flash-programming cmsis-dap jlink stlink cmsis-packs rtt firmware-flashing command-line linux macos

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markdown · JSON · MCP: product_card(name="pyocd/pyOCD")