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openocd-jtag

Use when configuring OpenOCD for a JTAG or SWD target, flashing through it, attaching GDB to a bare-metal MCU, or setting hardware breakpoints and watchpoints. Not for probe-rs: use embedded-rust.

.devin/skills/openocd-jtag/SKILL.md

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Last checked
Nov 4, 2026

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Repository last updated
Sep 28, 2026
License
Apache-2.0

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# OpenOCD over JTAG and SWD

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A microcontroller must be flashed or debugged through a debug adapter: an OpenOCD config is needed, GDB must attach to the target, a hardware breakpoint or watchpoint is needed, or OpenOCD reports a connection error. |
| Authority | Reversible local: writes only `openocd.cfg` and GDB command files in the project directory the user names; rollback is reverting those files in version control. No remote mutation. |
| Side effect | Flashing rewrites the target's flash. A debug session halts and resets the target. |
| Done | `openocd -f openocd.cfg` examines the target and reports its breakpoint and watchpoint count, `program firmware.elf verify reset` completes, and GDB stops at `main` after `load`. |

## Inputs

- Adapter: ST-LINK, CMSIS-DAP (DAPLink), J-Link, or an FTDI board, and whether the target exposes JTAG, SWD, or both.