ST STM32H735G Discovery

Overview

The STM32H735G-DK Discovery kit is a complete demonstration and development platform for Arm® Cortex®-M7 core-based STM32H735IGK6U microcontroller, with 1 Mbyte of Flash memory and 564 Kbytes of SRAM.

The STM32H735G-DK Discovery kit is used as a reference design for user application development before porting to the final product, thus simplifying the application development.

The full range of hardware features available on the board helps users to enhance their application development by an evaluation of all the peripherals (such as USB OTG FS, Ethernet, microSD™ card, USART, CAN FD, SAI audio DAC stereo with audio jack input and output, MEMS digital microphone, HyperRAM™, Octo-SPI Flash memory, RGB interface LCD with capacitive touch panel, and others). ARDUINO® Uno V3, Pmod™ and STMod+ connectors provide easy connection to extension shields or daughterboards for specific applications.

STLINK-V3E is integrated into the board, as the embedded in-circuit debugger and programmer for the STM32 MCU and USB Virtual COM port bridge. STM32H735G-DK board comes with the STM32CubeH7 MCU Package, which provides an STM32 comprehensive software HAL library as well as various software examples.

More information about the board can be found at the STM32H735G-DISCO website. More information about STM32H735 can be found here:

• STM32H725/735 on www.st.com

• STM32H735xx reference manual

• STM32H735xx datasheet

Supported Features

The current Zephyr stm32h735g_disco board configuration supports the following hardware features:

Interface	Controller	Driver/Component
NVIC	on-chip	nested vector interrupt controller
UART	on-chip	serial port-polling; serial port-interrupt
PINMUX	on-chip	pinmux
GPIO	on-chip	gpio
FLASH	on-chip	flash memory
ETHERNET	on-chip	ethernet
RNG	on-chip	True Random number generator
FMC	on-chip	memc (SDRAM)
ADC	on-chip	ADC Controller
FDCAN1	on-chip	CAN-FD Controller
FDCAN2	on-chip	CAN-FD Controller
FDCAN3	on-chip	CAN-FD Controller (disabled by default. Solder bridges SB29 and SB30 need to be closed for FDCAN3 to work)
USB	on-chip	usb_device

Other hardware features are not yet supported on Zephyr porting.

The default configuration can be found in the defconfig file: boards/st/stm32h735g_disco/stm32h735g_disco_defconfig

Pin Mapping

For more details please refer to STM32H735G-DISCO website.

Default Zephyr Peripheral Mapping:

• UART_3 TX/RX : PD8/PD9 (ST-Link Virtual Port Com)

• UART_7 TX/RX : PF7/PF6 (Arduino Serial)

• LD1 : PC2

• LD2 : PC3

• FDCAN1 : CAN

System Clock

The STM32H735G 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 550MHz. PLL clock is feed by a 25MHz high speed external clock.

Serial Port

The STM32H735G Discovery kit has up to 6 UARTs. The Zephyr console output is assigned to UART3 which connected to the onboard ST-LINK/V3.0. Virtual COM port interface. Default communication settings are 115200 8N1.

Programming and Debugging

STM32H735G-DISCO board includes an ST-LINK/V3 embedded debug tool interface.

See Building an Application for more information about application builds.

Flashing

The board is configured to be flashed using west STM32CubeProgrammer runner, so its installation is required.

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

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

It is advised to use STM32CubeProgrammer to check and update option bytes configuration.

Debugging

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b stm32h735g_disco samples/hello_world
west debug