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boards/st/nucleo_f446re/doc/index.rst

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.. zephyr:board:: nucleo_f446re

Overview

The Nucleo F446RE board features an ARM Cortex-M4 based STM32F446RE MCU with a wide range of connectivity support and configurations. Here are some highlights of the Nucleo F446RE board:

  • STM32 microcontroller in QFP64 package

  • Two types of extension resources:

    • Arduino Uno V3 connectivity
    • ST morpho extension pin headers for full access to all STM32 I/Os

  • On-board ST-LINK/V2-1 debugger/programmer with SWD connector

  • Flexible board power supply:

    • USB VBUS or external source(3.3V, 5V, 7 - 12V)
    • Power management access point

  • Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3)

  • Two push-buttons: USER and RESET

More information about the board can be found at the Nucleo F446RE website_.

Hardware

Nucleo F446RE provides the following hardware components:

  • STM32F446RET6 in LQFP64 package
  • ARM® 32-bit Cortex®-M4 CPU with FPU
  • Adaptive real-time accelerator (ART Accelerator)
  • 180 MHz max CPU frequency
  • VDD from 1.7 V to 3.6 V
  • 512 KB Flash
  • 128 KB SRAM
  • 10 General purpose timers
  • 2 Advanced control timers
  • 2 basic timers
  • SPI(4)
  • I2C(3)
  • USART(4)
  • UART(2)
  • USB OTG Full Speed and High Speed
  • CAN(2)
  • SAI(2)
  • SPDIF_Rx(1)
  • HDMI_CEC(1)
  • Quad SPI(1)
  • Camera Interface
  • GPIO(50) with external interrupt capability
  • 12-bit ADC(3) with 16 channels
  • 12-bit DAC with 2 channels

More information about STM32F446RE can be found here:

  • STM32F446RE on www.st.com_
  • STM32F446 reference manual_

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

Nucleo F446RE Board has 8 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.

Available pins:

.. image:: img/nucleo_f446re_arduino_top_left.jpg :align: center :alt: Nucleo F446RE Arduino connectors (top left) .. image:: img/nucleo_f446re_arduino_top_right.jpg :align: center :alt: Nucleo F446RE Arduino connectors (top right) .. image:: img/nucleo_f446re_morpho_top_left.jpg :align: center :alt: Nucleo F446RE Morpho connectors (top left) .. image:: img/nucleo_f446re_morpho_top_right.jpg :align: center :alt: Nucleo F446RE Morpho connectors (top right)

For more details please refer to STM32 Nucleo-64 board User Manual_.

Default Zephyr Peripheral Mapping:

  • UART_1_TX : PB6
  • UART_1_RX : PB7
  • UART_2_TX : PA2
  • UART_2_RX : PA3
  • USER_PB : PC13
  • LD2 : PA5
  • I2C1_SDA : PB9
  • I2C1_SCL : PB8
  • I2C2_SDA : PB3
  • I2C2_SCL : PB10
  • I2C3_SDA : PB4
  • I2C3_SCL : PA8

System Clock

Nucleo F446RE System Clock could be driven by an internal or external oscillator, as well as the main PLL clock. By default, the System clock is driven by the PLL clock at 84MHz, driven by an 8MHz high-speed external clock.

Serial Port

Nucleo F446RE board has 2 UARTs and 4 USARTs. The Zephyr console output is assigned to UART2. Default settings are 115200 8N1.

Backup SRAM

In order to test backup SRAM you may want to disconnect VBAT from VDD. You can do it by removing SB45 jumper on the back side of the board.

Controller Area Network

The TX/RX wires connected with D14/D15 of CN5 connector. Thus the board can be used with RS485 CAN Shield_.

Programming and Debugging

.. zephyr:board-supported-runners::

Nucleo F446RE board includes an ST-LINK/V2-1 embedded debug tool interface.

Applications for the nucleo_f446re board configuration can be built and flashed in the usual way (see :ref:build_an_application and :ref:application_run for more details).

Flashing

The board is configured to be flashed using west STM32CubeProgrammer_ runner, so its :ref:installation <stm32cubeprog-flash-host-tools> is required.

Alternatively, OpenOCD or JLink can also be used to flash the board using the --runner (or -r) option:

.. code-block:: console

$ west flash --runner openocd $ west flash --runner jlink

Flashing an application to Nucleo F446RE

Here is an example for the :zephyr:code-sample:hello_world application.

Run a serial host program to connect with your Nucleo board.

.. code-block:: console

$ minicom -b 115200 -D /dev/ttyACM0

Build and flash the application:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: nucleo_f446re :goals: build flash

You should see the following message on the console:

.. code-block:: console

$ Hello World! arm

Debugging

You can debug an application in the usual way. Here is an example for the :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: nucleo_f446re :maybe-skip-config: :goals: debug

.. _Nucleo F446RE website: https://www.st.com/en/evaluation-tools/nucleo-f446re.html

.. _STM32 Nucleo-64 board User Manual: https://www.st.com/resource/en/user_manual/dm00105823.pdf

.. _STM32F446RE on www.st.com: https://www.st.com/en/microcontrollers/stm32f446re.html

.. _STM32F446 reference manual: https://www.st.com/resource/en/reference_manual/dm00135183.pdf

.. _RS485 CAN Shield: https://www.waveshare.com/wiki/RS485_CAN_Shield

.. _STM32CubeProgrammer: https://www.st.com/en/development-tools/stm32cubeprog.html