ST 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:

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

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

Nucleo L073RZ 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 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