STM32F446 Core Board V1.1
Overview
The WeAct STM32F446 Core Board is an extremely low cost and bare-bones development board featuring the STM32F446RE, see STM32F446RE website [4]. This is the 64-pin variant of the STM32F446x series, see STM32F446x reference manual [5]. More info about the board available on WeAct Github [2].
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
The weact_stm32f446_core board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
STM32F4 ADC1 |
|
on-chip |
STM32 ADC2 |
||
CAN |
on-chip |
||
Clock control |
on-chip |
STM32 RCC (Reset and Clock controller)1 |
|
on-chip |
STM32 HSE Clock1 |
||
on-chip |
|||
on-chip |
STM32F4 Main PLL1 |
||
on-chip |
STM32F411 PLL I2S1 |
||
on-chip |
STM32 Microcontroller Clock Output (MCO)2 |
||
Counter |
on-chip |
STM32 counters7 |
|
DAC |
on-chip |
STM32 family DAC1 |
|
DMA |
on-chip |
STM32 DMA controller (V1)2 |
|
Flash controller |
on-chip |
STM32 Family flash controller1 |
|
GPIO & Headers |
on-chip |
STM32 GPIO Controller8 |
|
I2C |
on-chip |
||
I2S |
on-chip |
STM32 I2S controller3 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
on-chip |
STM32 External Interrupt Controller1 |
||
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Memory controller |
on-chip |
STM32 Battery Backed RAM1 |
|
on-chip |
STM32 Flexible Memory Controller (FMC)1 |
||
on-chip |
STM32 Flexible Memory Controller (SDRAM controller)1 |
||
MMC |
on-chip |
STM32 SDMMC Disk Access1 |
|
MTD |
on-chip |
STM32F4 flash memory1 |
|
PHY |
on-chip |
This binding is to be used by all the usb transceivers which are built-in with USB IP2 |
|
Pin control |
on-chip |
STM32 Pin controller1 |
|
Power management |
on-chip |
STM32 power controller1 |
|
PWM |
on-chip |
STM32 PWM8 |
|
Reset controller |
on-chip |
STM32 Reset and Clock Control (RCC) Controller1 |
|
RTC |
on-chip |
STM32 RTC1 |
|
Sensors |
on-chip |
STM32 quadrature decoder5 |
|
on-chip |
STM32 family TEMP node for production calibrated sensors with two calibration temperatures1 |
||
on-chip |
STM32 VREF+1 |
||
on-chip |
STM32 VBAT1 |
||
Serial controller |
on-chip |
||
on-chip |
STM32 UART2 |
||
SMbus |
on-chip |
STM32 SMBus controller3 |
|
SPI |
on-chip |
||
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
on-chip |
STM32 timers8 |
||
USB |
on-chip |
STM32 OTGFS controller1 |
|
on-chip |
STM32 OTGHS controller1 |
||
Watchdog |
on-chip |
STM32 watchdog1 |
|
on-chip |
STM32 system window watchdog1 |
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
The weact_stm32f446_core board supports the runners and associated west commands listed below.
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 [3]. 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 [1].
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.
# From the root of the zephyr repository
west build -b weact_stm32f446_core samples/basic/blinky
west flash
# From the root of the zephyr repository
west build -b weact_stm32f446_core samples/basic/button
west flash
# From the root of the zephyr repository
west build -b weact_stm32f446_core samples/subsys/fs/fs_sample
west 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.