Individual skill
stm32f401rc-blackpill
Firmware development for the 40-pin "Black Pill"-format board with an STM32F401RCT6 (STM32F401RC, LQFP64, 256 KB flash, 64 KB RAM, 84 MHz) that ships with the WeAct Studio HID Bootloader (USB 0483:572A, flash 0x08000000-0x08003FFF, app at 0x08004000) — its PC13 LED, KEY button on PA0, 25 MHz HSE, USB-C on USB_OTG_FS, and the PlatformIO + STM32Cube HAL setup around them, including a USB CDC virtual COM port for printf debugging. Use when working on this board, an unbranded F401RCT6 Black Pill clone, or any STM32F401/F411 board that enumerates as "WeAct Studio HID Bootloader": project setup, platformio.ini, linking at 0x08004000, flashing through the HID bootloader or ROM DFU, the app starting behind a bootloader (VTOR, SysTick, clock hand-off), clock/PLL configuration for 84 MHz plus 48 MHz USB, printf/serial console over USB (no /dev/cu or COM port), a blink that never starts or hangs in HAL_Delay, entering or recovering the bootloader, or debugging why something on the board does not work.
skills/stm32/stm32f401rc-blackpill/SKILL.md
Source commit 816967f30a7dbdf4759ad585b822eda3575f720c
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 11, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 27
- Repository last updated
- Oct 30, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agentic-ai Repository topic
- arduino Repository topic
- claude-code Repository topic
- esp32 Repository topic
- mcu Repository topic
- pico Repository topic
- platformio Repository topic
- skill-md Repository topic
- skills Repository topic
- stm32 Repository topic
- testing Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 14,510 bytesSKILL.mdcore · 14,510 bytesSKILL.mdcore · 14,510 bytesassets/IMAGE.mddoc · 87 bytesreference/board-hardware.mddoc · 21,449 bytesreference/recipes.mddoc · 16,281 bytestemplate/.gitignoreasset · 107 bytestemplate/README.mddoc · 5,813 bytestemplate/include/board.hasset · 1,368 bytestemplate/include/usb_device.hasset · 244 bytestemplate/include/usbd_cdc_if.hasset · 1,038 bytestemplate/include/usbd_conf.hasset · 1,061 bytestemplate/include/usbd_desc.hasset · 137 bytestemplate/ld/STM32F401RCTX_APP_0x08004000.ldasset · 5,335 bytestemplate/platformio.iniasset · 2,189 bytestemplate/scripts/hid_upload.pyruns · 1,116 bytestemplate/scripts/weact_hid_flash.pyruns · 8,166 bytestemplate/src/boot_handoff.casset · 2,320 bytestemplate/src/main.casset · 9,573 bytestemplate/src/usb_device.casset · 583 bytestemplate/src/usbd_cdc_if.casset · 5,548 bytestemplate/src/usbd_conf.casset · 8,237 bytestemplate/src/usbd_desc.casset · 5,085 bytestemplate/variants/minimal/main.casset · 4,436 bytestemplate/variants/new-project.shruns · 1,514 bytes
Read excerpt
# STM32F401RCT6 "Black Pill" with the WeAct HID bootloader
Board-specific firmware knowledge. The board's defining feature is not the chip but what sits in the
first 16 KB of its flash: WeAct's HID bootloader. Almost every failure on this board comes from code
that assumes it owns 0x08000000 and a freshly reset chip — neither is true here. Read the reference
files rather than guessing.
- `reference/board-hardware.md` — the hardware (MCU, pins, header, clocks, memory map with the
bootloader), a full description of the bootloader's behaviour and protocol, PlatformIO
configuration, flashing and recovery routes, and a symptom → cause → fix table (§9).
- `reference/recipes.md` — copy-paste code taken from `template/`: `platformio.ini`, the linker-script
change, the hand-off `Reset_Handler`, the 84/48 MHz clock tree, the USB CDC console, the flasher,
bootloader reinstall.
- `template/` — a **working PlatformIO project**: blink + USB CDC `printf` console, flashed over USB