RIOT/boards/weact-f401ce/doc.md

@defgroup boards_weact-f401ce WeAct-F401CE board @ingroup boards @brief Support for the WeAct-F401CE Board

Overview

WeAct-F401CE is a board with the same form-factor as the blue/blackpill, but with an STM32F401CEU6 and a USB-C connector.

It is available on sites like AliExpress for less than 3€.

Hardware

MCU

MCU	STM32F401CEU6
Family	ARM Cortex-M4F
Vendor	ST Microelectronics
RAM	96KiB
Flash	512KiB
Frequency	up to 84MHz
FPU	yes
Timers	8 (2x watchdog, 1 SysTick, 6x 16-bit, 2x 32-bit)
ADCs	1x 12-bit
UARTs	3
SPIs	4
I2Cs	3
RTC	1
Vcc	2.0V - 3.6V
Datasheet	Datasheet
Reference Manual	Reference Manual

Implementation Status

Device	ID	Supported	Comments
MCU	STM32F401CE	partly	Energy saving modes not fully utilized
Low-level driver	GPIO	yes
	PWM	yes (4 pins available))
	UART	2 UARTs	USART2 via PA3(RX)/PA2(TX), USART1 on PA10(RX)/PA9(TX)
	I2C	1 I2C
	SPI	1 SPI
	USB	yes
	Timer	1 32 bit timer (TIM5)

Flashing the device

The device comes with a bootloader that allows flashing via dfu-util.

If RIOT is already running on the board, you can upload your RIOT-firmware by typing

make BOARD=weact-f401ce flash

RIOT will make sure to enter the bootloader automatically.

If RIOT crashed or you have the plain board with the stock firmware, you have to enter the bootloader manually.

There are two buttons on the board labeled BOOT0 and NRST.

• Hold down BOOT0
• Shortly press NRST to reset the CPU while keeping BOOT0 held down

The board will now show up as 0483:df11 - STM32 BOOTLOADER and will accept firmware using the DFU protocol.

Note: You need to have write permissions to the device. On Linux you could add yourself to the plugdev group and store the following as /etc/udev/rules.d/99-weact-f401ce.rules:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", GROUP="plugdev", MODE="660"

UART

stdio is provided through USB CDC ACM so the board can be used without any extra hardware, save for a USB-C cable.