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zephyr

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Use when building a Zephyr app with west, picking a board target, editing prj.conf or a devicetree overlay, adding logging, running on native_sim, or using west debug. Not for FreeRTOS: use freertos.

.devin/skills/zephyr/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Zephyr RTOS

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A Zephyr application must be created, built, configured through Kconfig or devicetree, given logging, run on the host with `native_sim`, or debugged on hardware. |
| Authority | Reversible local: writes only the application directory the user names (`CMakeLists.txt`, `prj.conf`, overlays, `src/`) and, when asked, a `west.yml` manifest; rollback is reverting those files in version control. No remote mutation. |
| Side effect | New or edited application files. `west update` clones modules into the workspace. `west flash` rewrites the board's flash. |
| Done | `west build -b <board> <app>` produces `build/zephyr/zephyr.elf`, the same application builds for `native_sim` and prints its log lines when run, and on hardware `west flash` followed by a serial monitor shows the same lines. |

## Inputs

- Board target in `board/soc` form (`west boards` lists them).