This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

ST 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.

STM32U5A9J-DK Top View STM32U5A9J-DK Bottom View

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

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

Board is configured to be flashed using west STM32CubeProgrammer runner. Installation of STM32CubeProgrammer is then required to flash the board.,

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