Boring_TECH STM32H743VIT6 Board Definition for MicroPython

Build the Firmware

• Install the dependencies
• Clone the official MicroPython repo
• Build cross compiler
• Create a folder under ports/stm32/boards/, e.g. ports/stm32/boards/BORINGTECH_STM32H743
• Copy the definition files to the above folder
• Back to path ports/stm32
• Build the firmware with command make BOARD=BORINGTECH_STM32H743
• See here and here

Flash the Firmware

• Install STM32CubeProgrammer
• Keep pressing the BOOT button on the board, then connect the USB cable.
• Release the BOOT button.
• Click refresh button on the right panel of the STM32CubeProgrammer.
• Select the port from the dropdown menu and click 'Connect'.
• Click 'Open file' tab to select the firmware.hex.
• Click 'Download' to flash the firmware, wait until it finishes.
• Press RST button on the board to reset.

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Exposed Port Pins

• PA0-PA15
• PB0-PB15
• PC0-PC13 (PC14 OSC32_IN and PC15 OSC32_OUT not broken out)
• PD0-PD15
• PE0-PE15

Peripherals

RGB LED - common anode, low active

• LED_R: PC0
• LED_G: PC1
• LED_B: PC2

User Button

• PC13

QSPI Flash W25Q64 (8MB)

• QSPI_BK1_IO0: PD11
• QSPI_BK1_IO1: PD12
• QSPI_BK1_IO2: PE2
• QSPI_BK1_IO3: PA1
• QSPI_BK1_NCS: PB10
• QSPI_CLK: PB2

SPI Flash W25Q64 (8MB) - not used in this definition

• SPI2_CS: PB12
• SPI2_SCK: PB13
• SPI2_MISO: PB14
• SPI2_MOSI: PB15

MicroSD Slot - there's no card detect pin

• SDMMC1_D0: PC8
• SDMMC1_D1: PC9
• SDMMC1_D2: PC10
• SDMMC1_D3: PC11
• SDMMC1_CK: PC12
• SDMMC1_CMD: PD2

USB

• USB_DM: PA11
• USB_DP: PA12

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Bus Pinouts

Dummy SD Card detect pin

• Usage see here

SD_SW
PC3

UART

	UART1	UART2	UART3	UART4	UART7	UART8
TX	PA9	PD5	PD8	PD1	PE8	PE1
RX	PA10	PD6	PD9	PD0	PE7	PE0

I2C

	I2C1	I2C4
SCL	PB6	PB8
SDA	PB7	PB9

SPI

	SPI1	SPI2	SPI4	SPI6
CS	PA4	PB12	PE11	PA15
SCK	PA5	PB13	PE12	PB3
MISO	PA6	PB14	PE13	PB4
MOSI	PA7	PB15	PE14	PB5

CAN - pins are same as UART4

	CAN1
TX	PD1
RX	PD0

SD Card

The board does not have a "detect SD card present" pin. Manually write 0 to pyb.Pin.board.SD_SW to force pyb.SDCard().present() True.

>>> import pyb
>>> import os
>>> pyb.SDCard().present()
False
>>> from machine import Pin
>>> sd_sw = Pin(pyb.Pin.board.SD_SW, Pin.OUT)
>>> sd_sw.value()
0
>>> pyb.SDCard().present()
True
>>> sd_sw.value(1)
>>> pyb.SDCard().present()
False
>>> sd_sw.value(0)
>>> pyb.SDCard().present()
True
>>> os.mount(pyb.SDCard(), '/sd')
>>> os.listdir('/sd')
['bmp.py']

Put the SD card’s filesystem in the path list so Python scripts can be imported from the SD card.

>>> import sys
>>> sys.path
['', '/flash', '/flash/lib']
>>> sys.path.append('/sd')
>>> sys.path.append('/sd/lib')
>>> sys.path
['', '/flash', '/flash/lib', '/sd', '/sd/lib']

Reference

• https://github.com/mcauser/MCUDEV_DEVEBOX_H7XX_M
• https://github.com/koendv/micropython/tree/devel/ports/stm32/boards/DEVEBOX_STM32H743
• https://bitbucket.org/jstoefer/devebox_h743/src/master/
• https://www.micropython.org.cn/forum/viewtopic.php?f=10&p=3003&sid=5fe8fdfca1c26a500f32f5aacf0e8af8#p3003
• https://forum.micropython.org/viewtopic.php?f=12&t=7504