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.

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
FLASH	on-chip	flash memory
COUNTER	on-chip	rtc
ADC	on-chip	ADC Controller
DAC	on-chip	DAC Controller
PWM	on-chip	PWM
DMA	on-chip	Direct Memory Access
die-temp	on-chip	die temperature sensor
RTC	on-chip	rtc

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

The default configuration can be found in boards/st/nucleo_l152re/nucleo_l152re_defconfig

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:

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
DAC : PA4
PWM_3_CH1 : PA6

For more details please refer to STM32 Nucleo-64 board User Manual [4].

Programming and Debugging

Nucleo L152RE board includes an ST-LINK/V2-1 embedded debug tool interface.

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

The board is configured to be flashed using west STM32CubeProgrammer [5] runner, so its installation is required.

Alternatively, openocd can also be used to flash the board using the --runner (or -r) option:

$ west flash --runner openocd

Flashing an application to Nucleo L152RE

Here is an example for the Blinky 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