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low-power-embedded

Use when configuring MCU sleep/stop/standby, WFI, STM32 PWR, nRF sleep, clock gating, wake-up EXTI sources, or measuring current draw. Not for the wake ISR: use interrupts-and-exceptions-baremetal.

.devin/skills/low-power-embedded/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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# Low-power embedded

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Battery firmware misses its power budget, a device will not wake or wakes at once, sleep current stays in the milliamp range, or a main loop or RTOS idle hook must sleep between events. |
| Authority | Read-only: emits mode selection, entry and exit sequences, gating checklists, and measurement steps to chat; the user places them in the firmware. Rollback is not needed because no file is written. No remote mutation. |
| Side effect | Chat output only. |
| Done | The chosen mode is justified against wake latency and state retention, the entry sequence sets the mode bits the reference manual names, the wake source is configured, the clock tree restore after wake is stated, and current is measured with the measurement conditions recorded. |

## Inputs

- Target part and its power chapter (STM32 `PWR`, nRF `POWER`, or equivalent).