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stm32-baremetal

Use when scaffolding STM32 firmware without HAL, CMSIS-only clock/RCC config, STM32F4/H7 bring-up, or building with arm-none-eabi-gcc for Cortex-M. Not for the startup file: use baremetal-startup.

.devin/skills/stm32-baremetal/SKILL.md

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Instructions only
Last checked
Nov 4, 2026

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55
Repository last updated
Sep 28, 2026
License
Apache-2.0

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# STM32 bare metal with CMSIS only

## Contract

| Field | Bound contract |
|---|---|
| Trigger | STM32 firmware is started without the Cube HAL, vendor examples are ported to register-level code, a clock or flash-placement problem is being debugged, or a reproducible `arm-none-eabi-gcc` build layout is needed. |
| Authority | Reversible local: writes only the new project files under the directory the user names (startup file, system file, linker script, `main.c`, `Makefile`); rollback is deleting that directory or reverting it in version control. No remote mutation. |
| Side effect | New source, linker, and build files in the project directory. No existing file outside it is modified. |
| Done | The project builds with `arm-none-eabi-gcc`, `SystemInit` brings the system clock to the target frequency with bus prescalers and flash wait states inside the reference manual limits, a peripheral clock enable follows the read-back rule, and the flash and RAM map matches the part. |

## Inputs

- Exact part (for example STM32F407VG) and its reference manual and datasheet.