Nucleo L073RZ

Overview

The STM32 Nucleo-64 development board with STM32L073RZ 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 L073RZ website [1].

Hardware

Nucleo L073RZ 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

  • ARM* mbed*

  • 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: USER and RESET

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

    • Virtual COM port

    • Mass storage

    • Debug port

  • Support of wide choice of Integrated Development Environments (IDEs) including:

    • IAR

    • ARM Keil

    • GCC-based IDEs

More information about STM32L073RZ can be found in the STM32L0x3 reference manual [2]

Supported Features

The Zephyr nucleo_l073rz board configuration supports the following hardware features:

Interface

Controller

Driver/Component

NVIC

on-chip

nested vector interrupt controller

UART

on-chip

serial port-polling; serial port-interrupt

PINMUX

on-chip

pinmux

GPIO

on-chip

gpio

CLOCK

on-chip

reset and clock control

I2C

on-chip

i2c controller

SPI

on-chip

spi controller

WATCHDOG

on-chip

independent watchdog

PWM

on-chip

pwm

ADC

on-chip

ADC Controller

DAC

on-chip

DAC Controller

RNG

on-chip

Random Number Generator

EEPROM

on-chip

eeprom

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 the defconfig file: boards/st/nucleo_l073rz/nucleo_l073rz_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:

Nucleo L073RZ connectors

Default Zephyr Peripheral Mapping:

  • UART_1 TX/RX : PB6/PB7

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

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

  • SPI1 SCK/MISO/MOSI : PA5/PA6/PA7 (Arduino SPI)

  • USER_PB : PC13

  • LD2 : PA5

  • DAC : PA4

  • PWM_2_CH1 : PA5 (might conflict with SPI1)

For more details please refer to STM32 Nucleo-64 board User Manual [3].

Programming and Debugging

Nucleo L073RZ board includes an ST-LINK/V2-1 embedded debug tool interface.

Applications for the nucleo_l073rz 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 [4] 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 Nucleo L073RZ

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b nucleo_l073rz 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_l073rz samples/hello_world
west debug

References