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boards/weact/mini_stm32h7b0/doc/index.rst

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.. zephyr:board:: mini_stm32h7b0

Overview

The MiniSTM32H7B0 Core board is a compact development board equipped with an STM32H7B0VBT6 microcontroller. It features a variety of peripherals, including a user LED and button, a display, and external SPI and QuadSPI NOR flash memory.

Key Features

  • STM32 microcontroller in LQFP100 package

  • USB OTG or full-speed device

  • 1 user LED

  • User, boot, and reset push-buttons

  • 32.768 kHz and 25MHz HSE crystal oscillators

  • External NOR Flash memories: 64-Mbit Quad-SPI and 64-Mbit SPI

  • Board connectors:

    • Camera (8 bit) connector
    • ST7735 TFT-LCD 160 x 80 pixels (RGB565 3-SPI)
    • microSD™ card
    • USB Type-C Connector
    • SWD header for external debugger
    • 2x 40-pin GPIO connector

More information about the board can be found on the Mini_STM32H7B0 website_.

Hardware

The MiniSTM32H7B0 Core board provides the following hardware components:

  • STM32H7B0VBT6 in LQFP100 package
  • ARM 32-bit Cortex-M7 CPU with FPU
  • Chrom-ART Accelerator
  • Hardware JPEG Codec
  • 280 MHz max CPU frequency
  • VDD from 1.62 V to 3.6 V
  • 128 KB Flash
  • 1.4 MB SRAM
  • High-resolution timer (2.1 ns)
  • 32-bit timers(2)
  • 16-bit timers(10)
  • SPI(5)
  • I2C(4)
  • I2S (4)
  • USART(5)
  • UART(5)
  • USB OTG Full Speed and High Speed(1)
  • CAN FD(2)
  • SAI(4)
  • SPDIF_Rx(4)
  • HDMI_CEC(1)
  • Dual Mode Quad SPI(1)
  • Camera Interface
  • GPIO (up to 80) with external interrupt capability
  • 16-bit ADC(2) with 16 channels
  • 12-bit DAC with 2 channels(2)
  • True Random Number Generator (RNG)
  • 16-channel DMA
  • LCD-TFT Controller with XGA resolution

More information about STM32H7BO can be found here:

  • STM32H7B0VB on www.st.com_
  • STM32H7B0VB reference manual_
  • STM32H7B0VB datasheet_

Supported Features

.. zephyr:board-supported-hw::

Pin Mapping

MiniSTM32H7B0 Core board has 5 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.

For more details please refer to Mini_STM32H7B0 website_.

Default Zephyr Peripheral Mapping:

The MiniSTM32H7B0 Core board is configured as follows

  • USER_LED : PE3
  • USER_PB : PC13
  • SPI1 SCK/MISO/MOSI/NSS : PB3/PB4/PD7/PD6 (NOR Flash memory)
  • SPI4 SCK/MOSI/NSS : PE12/PE14/PE11 (LCD)
  • QuadSPI CLK/NCS/IO0/IO1/IO2/IO3 : PB2/PB6/PD11/PD12/PE2/PD13 (NOR Flash memory)
  • SDMMC1 CLK/DCMD/CD/D0/D1/D2/D3 : PC12/PD2/PD4/PC8/PC9/PC10/PC11 (microSD card)
  • USB DM/DP : PA11/PA12 (USB CDC ACM)

System Clock

The STM32H7B0VB System Clock can be driven by an internal or external oscillator, as well as by the main PLL clock. By default, the System clock is driven by the PLL clock at 280MHz. PLL clock is fed by a 25MHz high speed external clock.

Serial Port (USB CDC ACM)

The Zephyr console output is assigned to the USB CDC ACM virtual serial port. Virtual COM port interface. Default communication settings are 115200 8N1.

Programming and Debugging

.. zephyr:board-supported-runners::

The MiniSTM32H7B0 Core board facilitates firmware flashing via the USB DFU bootloader. This method simplifies the process of updating images, although it doesn't provide debugging capabilities. However, the board provides header pins for the Serial Wire Debug (SWD) interface, which can be used to connect an external debugger, such as ST-Link.

Flashing

To activate the bootloader, follow these steps:

  1. Press and hold the BOOT0 key.
  2. While still holding the BOOT0 key, press and release the RESET key.
  3. Wait for 0.5 seconds, then release the BOOT0 key.

Upon successful execution of these steps, the device will transition into bootloader mode and present itself as a USB DFU Mode device. You can program the device using the west tool or the STM32CubeProgrammer.

Flashing an application to MiniSTM32H7B0

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

First, put the board in bootloader mode as described above. Then build and flash the application in the usual way. Just add CONFIG_BOOT_DELAY=5000 to the configuration, so that USB CDC ACM is initialized before any text is printed, as below:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: mini_stm32h7b0 :goals: build flash :gen-args: -DCONFIG_BOOT_DELAY=5000

Run a serial host program to connect with your board:

.. code-block:: console

$ minicom -D <tty_device> -b 115200

Then, press the RESET button, you should see the following message after few seconds:

.. code-block:: console

Hello World! mini_stm32h7b0

Replace :code:<tty_device> with the port where the board XIAO BLE can be found. For example, under Linux, :code:/dev/ttyACM0.

Debugging

This current Zephyr port does not support debugging.

Testing the LEDs in the MiniSTM32H7B0

There is a sample that allows to test that LED on the board are working properly with Zephyr:

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: mini_stm32h7b0 :goals: build flash :gen-args: -DCONFIG_BOOT_DELAY=5000

You can build and flash the examples to make sure Zephyr is running correctly on your board. The LED definitions can be found in :zephyr_file:boards/weact/mini_stm32h7b0/mini_stm32h7b0.dts.

Testing shell over USB in the MiniSTM32H7B0

There is a sample that allows to test shell interface over USB CDC ACM interface with Zephyr:

.. zephyr-app-commands:: :zephyr-app: samples/subsys/shell/shell_module :board: mini_stm32h7b0 :goals: build flash :gen-args: -DCONFIG_BOOT_DELAY=5000

.. _Mini_STM32H7B0 website: https://github.com/WeActStudio/WeActStudio.MiniSTM32H7B0

.. _STM32H7B0VB on www.st.com: https://www.st.com/en/microcontrollers-microprocessors/stm32h7b0vb.html

.. _STM32H7B0VB reference manual: https://www.st.com/resource/en/reference_manual/rm0455-stm32h7a37b3-and-stm32h7b0-value-line-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

.. _STM32H7B0VB datasheet: https://www.st.com/resource/en/datasheet/stm32h7b0vb.pdf