STM32L4R9I Discovery

Overview

The 32L4R9IDISCOVERY Discovery kit is a complete demonstration and development platform for STMicroelectronics Arm® Cortex®-M4 core-based STM32L4R9AI microcontroller.

Leveraging the innovative ultra-low-power oriented features, 640 Kbytes of embedded RAM, graphics performance (Chrom-ART Accelerator), and DSI controller offered by the STM32L4R9AI, the 32L4R9IDISCOVERY Discovery kit enables users to easily prototype applications with state-of-the-art energy efficiency, as well as stunning audio and graphics rendering with direct support for AMOLED DSI round LCD display.

For even more user-friendliness, the on-board ST-LINK/V2-1 debugger provides out-of-the-box programming and debugging capabilities.

More information about the board can be found at the STM32L4R9I-DISCOVERY website. More information about STM32L4R9 can be found here:

Supported Features

The current Zephyr stm32l4r9i_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

PINMUX

on-chip

pinmux

GPIO

on-chip

gpio

FLASH

on-chip

on-chip flash memory; external OctoSPI memory

ADC

on-chip

ADC Controller

RTC

on-chip

Real Time Clock

I2C

on-chip

i2c

SPI

on-chip

spi

PWM

on-chip

pwm

SDMMC

on-chip

sd/mmc

Other hardware features are not yet supported on Zephyr porting.

The default configuration can be found in the defconfig file:

Pin Mapping

For more details, please refer to STM32L4R9I-DISCOVERY website.

System Clock

The STM32L4R9AI 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 120MHz. PLL clock is driven by a 4MHz medium speed internal clock.

Serial Port

The STM32L4R9I Discovery board has up to 6 U(S)ARTs. The Zephyr console output is assigned to UART2, which is connected to the onboard ST-LINK Virtual COM port interface. Default communication settings are 115200 8N1.

Programming and Debugging

The STM32L4R9I Discovery board includes an ST-LINK/V2-1 debug tool.

Applications for the stm32l4r9i_disco board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

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

Flashing an application to STM32L4R9I Discovery

Connect the STM32L4R9I Discovery to your host computer using the ST-LINK USB port, then run a serial host program to connect with the board. For example:

$ minicom -b 115200 -D /dev/ttyACM0

You can then build and flash applications in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b stm32l4r9i_disco samples/hello_world
west flash

You should see the following message in the serial host program:

$ Hello World! stm32l4r9i_disco

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 stm32l4r9i_disco samples/hello_world
west debug