WeAct STM32F411CEU6 (aka. BlackPill) Board Definition for MicroPython

Build the Firmware

• Install the dependencies
• Clone the official MicroPython repo
• Build cross compiler
• Create a folder under ports/stm32/boards/, e.g. ports/stm32/boards/WEACT_STM32F411CE
• Copy the definition files to the above folder
• Back to path ports/stm32
• Build the firmware with command make BOARD=WEACT_STM32F411CE
• See here and here

Flash the Firmware

• Install STM32CubeProgrammer
• Connect the USB cable.
• Keep pressing both the NRST & BOOT0 buttons on the board.
• Release the NRST button first, then release BOOT0 shortly after (in about 0.5s).
  • In case the device cannot be recognized, disconnect the USB cable, then cover the oscillators and the MCU with the thumb to warm them up for a while, and try again.
• Click refresh button on the right panel of the STM32CubeProgrammer.
• Select the port from the dropdown menu and click 'Connect'.
• Click 'Open file' tab to select the firmware.hex.
• Click 'Download' to flash the firmware, wait until it finishes.
• Press NRST button on the board to reset.

---

Exposed Port Pins

• PA0-PA15
• PB0-PB10, PB12-PB15
• PC13-PC15

Peripherals

BLUE LED - low active

• LED: PC13

User Button

• PA0

SPI Flash W25Q64 (8MB) - enabled in this definition

• F_CS: PA4
• F_SCK: PA5
• F_MISO: PA6
• F_MOSI: PA7

USB

• USB_DM: PA11
• USB_DP: PA12

---

Bus Pinouts

UART

	UART1	UART2	UART6
TX	PA9	PA2	PA11
RX	PA10	PA3	PA12

I2C

	I2C1	I2C2	I2C3
SCL	PB6	PB10	PA8
SDA	PB7	PB9	PB8

SPI

	SPI2	SPI3	SPI4	SPI5
CS	PB12	PA15	PB12	PB1
SCK	PB13	PB3	PB13	PA10
MISO	PB14	PB4	PA1	PA12
MOSI	PB15	PB5	PA11	PB0

• SPI1 used by external SPI Flash

Reference

• MicroPython Forum Discussion: WeAct STM32F411CEU6 black pill
• WeActTC / MiniF4-STM32F4x1
• https://github.com/mcauser/WEACT_F411CEU6
• https://github.com/YXZhu/micropython/tree/master/ports/stm32/boards/WeAct_F411CE
• https://github.com/jugnu-jethi/WeAct_F411CE-MicroPython/tree/myFix_FirstTimeBuild