STM32U5A9J Discovery Kit

Overview

The STM32U5A9J-DK Discovery kit is a complete demonstration and development platform for the STM32U5A9NJH6Q microcontroller, featuring an Arm® Cortex®-M33 core with Arm® TrustZone®.

Leveraging the innovative ultra-low-power oriented features, 2.5 Mbytes of embedded SRAM, 4 Mbytes of embedded flash memory, and rich graphics features, the STM32U5A9J-DK Discovery kit enables users to easily prototype applications with state-of-the-art energy efficiency, as well as providing stunning and optimized graphics rendering with the support of the 2.5D NeoChrom Accelerator, Chrom-ART Accelerator, and Chrom-GRC™ MMU.

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 a 2.47-inch RGB 480x480 pixels TFT round LCD module with MIPI DSI® interface and capacitive touch panel, USB Type-C® HS, Octo-SPI flash memory device, Hexadeca-SPI PSRAM memory device, eMMC flash memory device, Time-of-Flight and gesture detection sensor, temperature sensor, and two 2.54 mm pitch double-row flexible expansion connectors for easy prototyping with daughterboards for specific applications (USART, LPUART, two SPIs, SAI, three I2C, SDMMC, ADCs, timers, and GPIOs).

The STM32U5A9J-DK Discovery kit integrates an STLINK-V3E embedded in-circuit debugger and programmer for the STM32 microcontroller with a USB Virtual COM port bridge and comes with the STM32CubeU5 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 STM32U5A9J-DK website. More information about STM32U5A9NJH6Q can be found here:

Supported Features

The current Zephyr stm32u5a9j_dk 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
LPUART	on-chip	low power uart
PINMUX	on-chip	pinmux
GPIO	on-chip	gpio
RNG	on-chip	True Random number generator
I2C	on-chip	i2c
SPI	on-chip	spi
FLASH	on-chip	flash memory
ADC	on-chip	adc
SDMMC	on-chip	flash memory
WATCHDOG	on-chip	independent watchdog
PWM	on-chip	pwm
TIMER	on-chip	counter
RTC	on-chip	rtc

Other hardware features have not been enabled yet for this board.

The default configuration per core can be found in the defconfig file: boards/st/stm32u5a9j_dk/stm32u5a9j_dk_defconfig

Pin Mapping

For more details please refer to STM32U5A9J-DK board User Manual.

Default Zephyr Peripheral Mapping:

USART_1 TX/RX : PA9/PA10 (ST-Link Virtual Port Com)
LD3 : PE0
LD4 : PE1
User Button: PC13
USART_3 TX/RX : PB10/PB11
LPUART_1 TX/RX : PG7/PG8
I2C1 SCL/SDA : PG14/PG13
I2C2 SCL/SDA : PF1/PF0
I2C6 SCL/SDA : PD1/PD0
SPI2 SCK/MISO/MOSI/CS : PB13/PD3/PD4/PB12
SPI3 SCK/MISO/MOSI/CS : PG9/PG10/PG11/PG15
ADC1 : channel5 PA0, channel14 PC5
ADC2 : channel9 PA4
ADC4 : channel5 PF14

System Clock

The STM32U5A9J-DK Discovery kit relies on an HSE oscillator (16 MHz crystal) and an LSE oscillator (32.768 kHz crystal) as clock references. Using the HSE (instead of HSI) is mandatory to manage the DSI interface for the LCD module and the USB high‑speed interface.

Serial Port

The STM32U5A9J Discovery kit has up to 4 USARTs, 2 UARTs, and 1 LPUART. The Zephyr console output is assigned to USART1 which connected to the onboard ST-LINK/V3.0. Virtual COM port interface. Default communication settings are 115200 8N1.

Programming and Debugging

STM32U5A9J Discovery kit includes an ST-LINK/V3 embedded debug tool interface. This probe allows to flash and debug the board using various tools.

Flashing

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

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

$ west flash --runner openocd

Flashing an application to STM32U5A9J_DK

Connect the STM32U5A9J Discovery board to your host computer using the USB port, then run a serial host program to connect with your Discovery board. For example:

$ minicom -D /dev/ttyACM0 -b 115200

Then, build and flash in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b stm32u5a9j_dk samples/hello_world
west flash

You should see the following message on the console:

Hello World! stm32u5a9j_dk

Debugging

Default debugger for this board is openocd. It could be used in the usual way with “west debug” command. Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b stm32u5a9j_dk samples/basic/blinky
west debug