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circuitpython-org/_board/stm32f411ce_blackpill_with_flash.md
Jeff Epler 4715875cc4 Fix board dates to always be of the form YYYY-MM-DD 
.. leading zeros are required for `frontmatter` to treat them as dates
rather than strings, apparently per the YAML specification.

This was done by script:
```py
import re
import datetime
import pathlib
import sys

import frontmatter

rx = re.compile(r'^(\s*)date_added:.*$', re.M)

for path_str in sys.argv[1:]:
    print(path_str)
    path = pathlib.Path(path_str)

    post = frontmatter.load(path)
    date_added = post.get("date_added", "")

    if isinstance(date_added, datetime.date):
        continue

    if isinstance(date_added, str):
        try:
            date_added = datetime.datetime.strptime(date_added, "%Y-%m-%d")
        except ValueError as exc:
            print(f"Failed to parse date {date_added} in {path_str}: {exc}")
            continue

    date_added = date_added.date()
    content = path.read_text("utf-8")
    new_content = rx.sub(lambda m: f"{m.group(1)}date_added: {date_added}", content)
    assert content != new_content

    path.write_text(new_content, "utf-8")
```
2024-03-22 11:31:45 -05:00

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layout board_id title name manufacturer board_url board_image date_added family features
download stm32f411ce_blackpill_with_flash STM32F411CE Black Pill with Flash Download STM32F411CE Black Pill with Flash WeAct Studio
https://github.com/WeActTC/MiniF4-STM32F4x1
stm32f411ce_blackpill.jpg 2021-04-06 stm
USB-C
Breadboard-Friendly

In the F401 series, the chip is the cheapest, even cheaper than some F1, and crushed F1 on the main frequency, and has a floating-point arithmetic module, the IO port contains all the basic functions. Therefore, it is possible to provide a learning platform with a very high cost performance for beginners. In practical applications, it is not because the computing power is insufficient, and the IO port is incomplete and hinders development.

Product details

  • STM32F411CEU6 100 MHz, 128 KB RAM, 512 KB ROM
  • 25 MHz high speed crystal oscillator & 32.768 KHz 6PF low speed crystal oscillator
  • Gold sinking process is adopted, lead-free process is used, and the needle arrangement is gold-plated, which is more environmentally friendly
  • Flash pads are reserved to provide USBDisk&&FATFFS routines
  • Support for MicroPython programming with available MicroPython firmware
  • Support for Arduino and C programming development
  • Version V3.0, there are 3 buttons, reset key, BOOT0 key, user key
  • CMSIS-DAP firmware is available
  • The use of the latest original ST chip, high quality crystal vibration

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