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boards/st/nucleo_h745zi_q/doc/index.rst

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.. zephyr:board:: nucleo_h745zi_q

Overview

The STM32 Nucleo-144 board provides an affordable and flexible way for users to try out new concepts and build prototypes by choosing from the various combinations of performance and power consumption features, provided by the STM32 microcontroller. For the compatible boards, the internal or external SMPS significantly reduces power consumption in Run mode.

The ST Zio connector, which extends the ARDUINO® Uno V3 connectivity, and the ST morpho headers provide an easy means of expanding the functionality of the Nucleo open development platform with a wide choice of specialized shields. The STM32 Nucleo-144 board does not require any separate probe as it integrates the ST-LINK V3 debugger/programmer.

The STM32 Nucleo-144 board comes with the STM32 comprehensive free software libraries and examples available with the STM32Cube MCU Package.

Key Features

  • STM32 microcontroller in LQFP144 package

  • Ethernet compliant with IEEE-802.3-2002 (depending on STM32 support)

  • USB OTG or full-speed device (depending on STM32 support)

  • 3 user LEDs

  • 2 user and reset push-buttons

  • 32.768 kHz crystal oscillator

  • Board connectors:

  • USB with Micro-AB

  • Ethernet RJ45 (depending on STM32 support)

  • SWDST Zio connector including Arduino* Uno V3ST

  • ST morpho expansion

  • Flexible power-supply options: ST-LINK USB VBUS or external sources

  • External or internal SMPS to generate Vcore logic supply

  • On-board ST-LINK/V3 debugger/programmer with USB re-enumeration

  • capability: mass storage, virtual COM port and debug port

  • USB OTG full speed or device only

  • Comprehensive free software libraries and examples available with the STM32Cube MCU package.

  • Arm* Mbed Enabled* compliant (only for some Nucleo part numbers)

More information about the board can be found at the Nucleo H745ZI-Q website_.

Hardware

Nucleo H745ZI-Q provides the following hardware components:

  • STM32H745ZI in LQFP144 package
  • ARM 32-bit Cortex-M7 CPU with FPU
  • ARM 32-bit Cortex-M4 CPU with FPU
  • Chrom-ART Accelerator
  • Hardware JPEG Codec
  • 480 MHz max CPU frequency
  • VDD from 1.62 V to 3.6 V
  • 2 MB Flash
  • 1 MB SRAM
  • High-resolution timer (2.1 ns)
  • 32-bit timers(2)
  • 16-bit timers(12)
  • SPI(6)
  • I2C(4)
  • I2S (3)
  • USART(4)
  • UART(4)
  • USB OTG Full Speed and High Speed(1)
  • USB OTG Full Speed(1)
  • CAN FD(2)
  • SAI(2)
  • SPDIF_Rx(4)
  • HDMI_CEC(1)
  • Dual Mode Quad SPI(1)
  • Camera Interface
  • GPIO (up to 114) with external interrupt capability
  • 16-bit ADC(3) with 36 channels / 3.6 MSPS
  • 12-bit DAC with 2 channels(2)
  • True Random Number Generator (RNG)
  • 16-channel DMA
  • LCD-TFT Controller with XGA resolution

Supported Features

.. zephyr:board-supported-hw::

For more details please refer to STM32 Nucleo-144 board User Manual_.

Default Zephyr Peripheral Mapping:

The Nucleo H745ZI board features a ST Zio connector (extended Arduino Uno V3) and a ST morpho connector. Board is configured as follows:

  • UART_3 TX/RX : PD8/PD9 (ST-Link Virtual Port Com)
  • USER_PB : PC13
  • LD1 : PB0
  • LD2 : PE1
  • LD3 : PB14
  • I2C : PB8, PB9
  • SPI : PA5, PA6, PB5, PD14

System Clock

Nucleo H745ZI-Q 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 480MHz, driven by an 8MHz high-speed external clock.

Serial Port

Nucleo H745ZI-Q board has 4 UARTs and 4 USARTs. The Zephyr console output is assigned to UART3. Default settings are 115200 8N1.

Resources sharing

The dual core nature of STM32H745 SoC requires sharing HW resources between the two cores. This is done in 3 ways:

  • Compilation: Clock configuration is only accessible to M7 core. M4 core only has access to bus clock activation and deactivation.
  • Static pre-compilation assignment: Peripherals such as a UART are assigned in devicetree before compilation. The user must ensure peripherals are not assigned to both cores at the same time.
  • Run time protection: Interrupt-controller and GPIO configurations could be accessed by both cores at run time. Accesses are protected by a hardware semaphore to avoid potential concurrent access issues.

Programming and Debugging

.. zephyr:board-supported-runners::

Nucleo H745ZI-Q board includes an ST-LINK/V3 embedded debug tool interface.

Applications for the nucleo_h745zi_q board should be built per core target, using either nucleo_h745zi_q/stm32h745xx/m7 or nucleo_h745zi_q/stm32h745xx/m4 as the target (see :ref:build_an_application and :ref:application_run for more details).

.. note::

Check if the board's ST-LINK V3 has the newest FW version. It can be updated using STM32CubeProgrammer_.

Flashing

Flashing operation will depend on the target to be flashed and the SoC option bytes configuration.

The board is configured to be flashed using west STM32CubeProgrammer_ runner for both cores, so its :ref:installation <stm32cubeprog-flash-host-tools> is required. The target core is detected automatically.

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

It is advised to use STM32CubeProgrammer_ to check and update option bytes configuration.

By default:

  • CPU0 (Cortex-M7) boot address is set to 0x80000000 (OB: BOOT_CM7_ADD0)
  • CPU1 (Cortex-M4) boot address is set to 0x81000000 (OB: BOOT_CM4_ADD0)

Also, default out of the box board configuration enables CM7 and CM4 boot when board is powered (Option bytes BCM7 and BCM4 are checked). In that configuration, Kconfig boot option STM32H7_BOOT_CM4_CM7 should be selected. Zephyr flash configuration has been set to meet these default settings.

Flashing an application to STM32H745ZI M7 Core

First, connect the NUCLEO-H745ZI-Q to your host computer using the USB port to prepare it for flashing. Then build and flash your application.

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

Run a serial host program to connect with your NUCLEO-H745ZI-Q board.

.. code-block:: console

$ minicom -b 115200 -D /dev/ttyACM0

or use screen:

.. code-block:: console

$ screen /dev/ttyACM0 115200

Build and flash the application:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: nucleo_h745zi_q/stm32h745xx/m7 :goals: build flash

You should see the following message on the console:

.. code-block:: console

$ Hello World! nucleo_h745zi_q_m7

.. note:: Sometimes, flashing is not working. It is necessary to erase the flash (with STM32CubeProgrammer for example) to make it work again.

Similarly, you can build and flash samples on the M4 target. For this, please take care of the resource sharing (UART port used for console for instance).

Here is an example for the :zephyr:code-sample:blinky application on M4 core.

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: nucleo_h745zi_q/stm32h745xx/m4 :goals: build flash

.. note::

Flashing both M4 and M7 and pushing RESTART button on the board leads to LD1 and LD2 flashing simultaneously.

Debugging

You can debug an application on Cortex M7 side 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_h745zi_q/stm32h745xx/m7 :maybe-skip-config: :goals: debug

Debugging a Zephyr application on Cortex M4 side with west is currently not available. As a workaround, you can use STM32CubeIDE_.

.. _Nucleo H745ZI-Q website: https://www.st.com/en/evaluation-tools/nucleo-h745zi-q.html

.. _STM32 Nucleo-144 board User Manual: https://www.st.com/resource/en/user_manual/dm00499171-stm32h7-nucleo144-boards-mb1363-stmicroelectronics.pdf

.. _STM32H745ZI on www.st.com: https://www.st.com/en/microcontrollers-microprocessors/stm32h745zi.html

.. _STM32H745 reference manual: https://www.st.com/resource/en/reference_manual/dm00176879-stm32h745755-and-stm32h747757-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

.. _OpenOCD installing Debug Version: https://github.com/zephyrproject-rtos/openocd

.. _OpenOCD installing with ST-LINK V3 support: https://mbd.kleier.net/integrating-st-link-v3.html

.. _STM32CubeIDE: https://www.st.com/en/development-tools/stm32cubeide.html

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