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boards/weact/stm32f446_core/doc/index.rst

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.. zephyr:board:: weact_stm32f446_core

Overview

The WeAct STM32F446 Core Board is an extremely low cost and bare-bones development board featuring the STM32F446RE, see STM32F446RE website. This is the 64-pin variant of the STM32F446x series, see STM32F446x reference manual. More info about the board available on WeAct Github_.

Hardware

The STM32F446RE based Core Board provides the following hardware components:

  • STM32F446RE in QFPN64 package
  • ARM® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator) allowing 0-wait state execution from Flash memory
  • 180 MHz max CPU frequency
  • VDD from 1.7 V to 3.6 V
  • 512 KB Flash
  • 128 Kbytes of SRAM
  • GPIO with external interrupt capability
  • 3x12-bit, 2.4 MSPS ADC up to 16 channels
  • 2x12-bit D/A converters
  • 16-stream DMA controller
  • Up to 17 Timers (twelve 16-bit, two 32-bit, two watchdog timers and a SysTick timer)
  • USART/UART (4)
  • I2C (4)
  • SPI/I2S (4)
  • CAN (2)
  • SDIO
  • USB 2.0 full-speed device/host/OTG controller with on-chip PHY
  • SAI (Serial Audio Interface)
  • SPDIFRX interface
  • HDMI-CEC
  • CRC calculation unit
  • 96-bit unique ID
  • RTC with hardware calendar

Supported Features

.. zephyr:board-supported-hw::

Pin Mapping

Default Zephyr Peripheral Mapping:

  • UART_1 TX/RX : PA9/PA10 (also available on USB-C for console)
  • UART_2 TX/RX : PA2/PA3
  • I2C1 SCL/SDA : PB6/PB7
  • I2C2 SCL/SDA : PB10/PB11
  • SPI1 SCK/MISO/MOSI : PA5/PA6/PA7
  • SPI2 SCK/MISO/MOSI : PB13/PB14/PB15
  • CAN1 TX/RX : PB9/PB8
  • SDMMC1 D0/D1/D2/D3/CLK/CMD : PC8/PC9/PC10/PC11/PC12/PD2
  • USER_PB : PC13 (Active Low)
  • USER_LED : PB2 (Active High)
  • USB_DM/USB_DP : PA11/PA12

OnBoard Features

  • USB Type-C connector
  • User LED (PB2) - Active High
  • User Key (PC13) - Active Low
  • BOOT0 Key for DFU mode
  • RESET Key
  • 8MHz HSE crystal oscillator
  • 32.768kHz LSE crystal oscillator
  • MicroSD card slot (SDIO interface)
  • SWD debug header (3.3V, GND, SWCLK, SWDIO)
  • 30×2 pin headers exposing GPIO pins

Clock Sources

The board has two external oscillators. The frequency of the slow clock (LSE) is 32.768 kHz. The frequency of the main clock (HSE) is 8 MHz.

The default configuration sources the system clock from the PLL, which is derived from HSE, and is set at 180MHz, which is the maximum possible frequency for the STM32F446RE.

Programming and Debugging

.. zephyr:board-supported-runners::

There are 2 main entry points for flashing STM32F4X SoCs, one using the ROM bootloader, and another by using the SWD debug port (which requires additional hardware). Flashing using the ROM bootloader requires a special activation pattern, which can be triggered by using the BOOT0 pin.

Flashing

Installing dfu-util

It is recommended to use at least v0.8 of dfu-util_. The package available in debian/ubuntu can be quite old, so you might have to build dfu-util from source.

There is also a Windows version which works, but you may have to install the right USB drivers with a tool like Zadig_.

Flashing an Application

Connect a USB-C cable and the board should power ON. Force the board into DFU mode by keeping the BOOT0 switch pressed while pressing and releasing the NRST switch.

The dfu-util runner is supported on this board and so a sample can be built and tested easily.

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: weact_stm32f446_core :goals: build flash

.. zephyr-app-commands:: :zephyr-app: samples/basic/button :board: weact_stm32f446_core :goals: build flash

.. zephyr-app-commands:: :zephyr-app: samples/subsys/fs/fs_sample :board: weact_stm32f446_core :goals: build flash

Debugging

The board can be debugged by installing the included 100 mil (0.1 inch) header, and attaching an SWD debugger to the 3V3 (3.3V), GND, SCK, and DIO pins on that header.

References

.. target-notes::

.. _board release notes: https://github.com/WeActStudio/WeActStudio.STM32F4_64Pin_CoreBoard/blob/master/README.md

.. _Zadig: https://zadig.akeo.ie/

.. _WeAct Github: https://github.com/WeActStudio/WeActStudio.STM32F4_64Pin_CoreBoard

.. _dfu-util: http://dfu-util.sourceforge.net/build.html

.. _STM32F446RE website: https://www.st.com/en/microcontrollers-microprocessors/stm32f446re.html

.. _STM32F446x reference manual: https://www.st.com/resource/en/reference_manual/rm0390-stm32f446xx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf