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stm32f411-blackpill SKILL.md skillA

stm32f411-blackpill from alexex1993/mcu-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add alexex1993/mcu-skills/stm32f411-blackpill@git:20261030.816967f

Pins git:20261030.816967f in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: alexex1993/mcu-skills
Path: skills/stm32/stm32f411-blackpill/SKILL.md
Versions recorded: 2
Latest version: git:20261030.816967f, committed Oct 30, 2026
First version recorded: Aug 22, 2026
Size: 9,319 bytes
Repository stars: 26
License: MIT

Firmware development for the WeAct Studio "Black Pill" (STM32F411CEU6) and its clones such as the DFRobot DFR0864 — the 25 MHz HSE and 32.768 kHz LSE crystals, PC13 LED, K1 button, USB-C wired straight to USB_OTG_FS, ROM DFU flashing, the SPI-flash footprint, and the STM32Cube HAL + PlatformIO setup around them. Use when working on this board or any STM32F411CE/F401CC Black Pill: project setup, platformio.ini, clock and PLL configuration for 96 MHz plus 48 MHz USB, pin mapping on the 48-pin…

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# WeAct "Black Pill" — STM32F411CEU6

Board-specific firmware knowledge. The two reference files hold the detail — read the one you need
rather than guessing, because most of the failure modes below are silent (the board runs, just
wrongly).

- `reference/board-hardware.md` — complete hardware reference: pin map for the 48-pin package with
  every alternate function, power tree, memory map, boot modes, **plus** a full development guide
  (Part II: §12 PlatformIO, §13 bring-up order, §14 peripheral cookbook, §15 F4/M4 gotchas,
  §16 flashing and recovery, §17 pitfall table).
- `reference/recipes.md` — copy-paste-ready code: `platformio.ini`, `board.h`, the clock tree, RTC on
  the LSE crystal, the calibrated temperature sensor, the complete USB CDC stack.
- `template/` — a **complete working project** that builds and flashes, plus a scaffolding script.
  It is where every recipe was extracted from; see `template/README.md`.

## Orientation

| | |
|---|---|
| MCU | STM32F411CEU6, Cortex-M4F, **512 KB flash, 128 KB SRAM**, UFQFPN48, 100 MHz max |
| Crystals | HSE 25 MHz on PH0/PH1, LSE 32.768 kHz on PC14/PC15 — **both fitted from the factory** |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add alexex1993/mcu-skills/stm32f411-blackpill@sha256:14d5da711d2c7c4a

The line at the top of this page pins the label git:20261030.816967f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_vudepcorqn7qcn26.svg)](https://markdownregistry.com/a/art_vudepcorqn7qcn26)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Aug 22, 2026 and Oct 30, 2026, about one every 69 days.

version	committed	commit	size	audit
git:20261030.816967f latest	2026-10-30	816967f	9,319 B	A	view · diff
git:20260822.4e075e9	2026-08-22	4e075e9	9,256 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (9319 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

alexex1993/mcu-skills · 26 stars · license MIT · pushed 2026-10-30 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_vudepcorqn7qcn26
GET https://markdownregistry.com/api/v1/resolve?ref=alexex1993/mcu-skills/stm32f411-blackpill
GET https://markdownregistry.com/api/v1/blob/14d5da711d2c7c4afcb0052eba5fba0676be969ce71bbf9db5e6caf3624234dd

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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