RAK3172

Overview

RAK3172 is a WisDuo LPWAN module which integrating a STM32WLE5CC chip. The breakout board has the RAK3172 as its core and with soldered to the antenna connector.

Hardware

The breakout board footprint allows RAK3172 stamp module pins to be transferred to 2.54 mm headers. It is designed to easy access to the pins on the board and simplify the evaluation of the RAK3172 module.

  • RAK3172 STM32WLE5CC Module with LPWAN single-core Cortex®-M4 at 48 MHz

  • 256-Kbyte Flash memory and 64-Kbyte SRAM

  • RF transceiver LoRa® modulations

  • Hardware encryption AES256-bit and a True random number generator

  • SMA connectors for the LORA antenna

  • I/O ports:

    • UART

    • I2C

    • SPI

    • SWD

RAK3172-pinout

For more information about the RAK3172 stamp module:

Supported Features

The rak3172 board supports the following hardware features:

Interface

Controller

Driver/Component

ADC

on-chip

adc

AES

on-chip

crypto

COUNTER

on-chip

rtc

CLOCK

on-chip

reset and clock control

FLASH

on-chip

flash

GPIO

on-chip

gpio

I2C

on-chip

i2c

MPU

on-chip

arch/arm

NVIC

on-chip

arch/arm

PINMUX

on-chip

pinmux

RADIO

on-chip

LoRa

SPI

on-chip

spi

UART

on-chip

serial

WATCHDOG

on-chip

independent watchdog

The default configuration can be found in the defconfig file: boards/rakwireless/rak3172/rak3172_defconfig.

Programming and Debugging

The RAK3172 board can be debugged and flashed with an external debug probe connected to the SWD pins. It can also be flashed via pyOCD [3], but have to install an additional pack to support STM32WL.

$ pyocd pack --update
$ pyocd pack --install stm32wl

Flashing an application

Connect the board to your host computer and build and flash an application. The sample application Hello World is used for this example. Build the Zephyr kernel and application, then flash it to the device:

# From the root of the zephyr repository
west build -b rak3172 samples/hello_world
west flash

Run a serial terminal to connect with your board. By default, usart1 is accessible via the USB to TTL converter.

  • Speed: 115200

  • Data: 8 bits

  • Parity: None

  • Stop bits: 1

Hello World! rak3172/stm32wle5xx

References