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ST Nucleo L152RE

Overview

The STM32 Nucleo-64 development board with STM32L152RE MCU, supports Arduino™ and ST morpho connectivity.

The STM32 Nucleo board provides an affordable, and flexible way for users to try out new concepts, and build prototypes with the STM32 microcontroller, choosing from the various combinations of performance, power consumption and features.

The Arduino Uno V3 connectivity support and the ST morpho headers allow easy functionality expansion of the STM32 Nucleo open development platform with a wide choice of specialized shields.

The STM32 Nucleo board integrates the ST-LINK/V2-1 debugger and programmer.

The STM32 Nucleo board comes with the STM32 comprehensive software HAL library together with various packaged software examples.

NUCLEO-L152RE

More information about the board can be found at the Nucleo L152RE website 1.

Hardware

Nucleo L152RE provides the following hardware components:

  • STM32 microcontroller in QFP64 package

  • Two types of extension resources:

    • Arduino Uno V3 connectivity

    • ST morpho extension pin headers for full access to all STM32 I/Os

  • On-board ST-LINK/V2-1 debugger/programmer with SWD connector:

    • Selection-mode switch to use the kit as a standalone ST-LINK/V2-1

  • Flexible board power supply:

    • USB VBUS or external source (3.3V, 5V, 7 - 12V)

    • Power management access point

  • Three LEDs:

    • USB communication (LD1), user LED (LD2), power LED (LD3)

  • Two push-buttons: B1 (USER/blue) and B2 (RESET/black)

  • USB re-enumeration capability. Three different interfaces supported on USB:

    • Virtual COM port

    • Mass storage

    • Debug port

More information about STM32L152RE can be found here:

Supported Features

The Zephyr nucleo_l152re board configuration supports the following hardware features:

Interface

Controller

Driver/Component

NVIC

on-chip

nested vector interrupt controller

CLOCK

on-chip

reset and clock control

PINMUX

on-chip

pinmux

UART

on-chip

serial port-polling; serial port-interrupt

GPIO

on-chip

gpio

I2C

on-chip

i2c controller

EEPROM

on-chip

eeprom

WATCHDOG

on-chip

independent watchdog

Other hardware features are not yet supported in this Zephyr port.

The default configuration can be found in the defconfig file: boards/arm/nucleo_l152re/nucleo_l152re_defconfig

System Clock

Nucleo L152RE System Clock could be driven by internal or external oscillator, as well as main PLL clock. It should theoretically support running at 32MHz, but a bug (under investigation) limits operations to 16MHz.

Connections and IOs

Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as input (with or without pull-up or pull-down), or as peripheral alternate function. Most of the GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current capable except for analog inputs.

Board connectors:

Nucleo L152RE connectors

Default Zephyr Peripheral Mapping:

  • UART_2 TX/RX : PA2/PA3 (ST-Link Virtual COM Port)

  • I2C1 SCL/SDA : PB8/PB9 (Arduino I2C)

  • B1 (USER/blue) : PC13

  • LD1 : PA5

For mode details please refer to STM32 Nucleo-64 board User Manual 4.

Programming and Debugging

Applications for the nucleo_l152re board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

Nucleo L152RE board includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in the Zephyr SDK.

Flashing an application to Nucleo L152RE

Here is an example for the Blinky sample application.

# From the root of the zephyr repository
west build -b nucleo_l152re samples/basic/blinky
west flash

You will see the LED blinking every second.

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 nucleo_l152re samples/hello_world
west debug