ST 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:

• STM32L4R9/S9 on www.st.com

• STM32L4+ Series reference manual

• STM32L4R5xx/R7xx/R9xx datasheet

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:

boards/arm/stm32l4r9i_disco/stm32l4r9i_disco_defconfig

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

Flashing

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 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