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ST Nucleo G0B1RE

Overview

The Nucleo G0B1RE board features an ARM Cortex-M0+ based STM32G0B1RE MCU with a wide range of connectivity support and configurations. Here are some highlights of the Nucleo G0B1RE board:

  • STM32 microcontroller in QFP64 package

  • Board connectors:

    • 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

  • Flexible board power supply:

    • 5V_USB_STLK from ST-Link USB connector

    • VIN (7 - 12V) from ARDUINO connector or ST morpho connector

    • E5V from ST morpho connector

    • 5V_USB_CHG from ST-LINK USB connector

    • 3.3V on ARDUINO connector or ST morpho connector

  • Three LEDs: USB communication (LD1), user LED (LD4), power LED (LD3)

  • Two push-buttons: USER and RESET

  • 32.768 kHz crystal oscillator

Nucleo G0B1RE

More information about the board can be found at the Nucleo G0B1RE website 1.

Hardware

Nucleo G0B1RE provides the following hardware components:

  • STM32G0B1RE in LQFP64 package

  • ARM 32-bit Cortex-M0+ CPU

  • 64 MHz max CPU frequency

  • Voltage range from 1.7 V to 3.6 V

  • 512 KB Flash

  • 144 kB SRAM

  • 32-bit timers(1)

  • 16-bit timers(11)

  • watchdogs(2)

  • systick(1)

  • Calendar RTC with alarm and periodic wakeup

  • I2C(3)

  • USART(6)

  • LPUART(2)

  • 32 Mbit/s SPI(3) multiplexed with I2S(2)

  • HDMI_CEC(1)

  • USB 2.0 FS device (crystal-less) and host controller(1)

  • USB Type-C Power Delivery controller

  • CAN-FD(2)

  • GPIO (up to 94) with external interrupt capability

  • Tamper Pins(3)

  • 12-bit ADC with 16 channels

  • 12-bit DAC with 2 channels(2)

  • Analog Comparator(3)

  • 12-channel DMA

More information about STM32G0B1RE can be found here:

Supported Features

The Zephyr nucleo_g0b1re board configuration supports the following hardware features:

Interface

Controller

Driver/Component

MPU

on-chip

arm memory protection unit

NVIC

on-chip

nested vector interrupt controller

UART

on-chip

serial port-polling; serial port-interrupt

PINMUX

on-chip

pinmux

GPIO

on-chip

gpio

I2C

on-chip

i2c

SPI

on-chip

spi

CLOCK

on-chip

reset and clock control

COUNTER

on-chip

rtc

WATCHDOG

on-chip

independent watchdog

PWM

on-chip

pwm

ADC

on-chip

adc

DAC

on-chip

dac

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

The default configuration can be found in the defconfig file: boards/arm/nucleo_g0b1re/nucleo_g0b1re_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.

Default Zephyr Peripheral Mapping:

  • UART_1 TX/RX : PC4/PC5

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

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

  • I2C2 SCL/SDA : PA11/PA12

  • SPI1 NSS/SCK/MISO/MOSI : PB0/PA5/PA6/PA7 (Arduino SPI)

  • SPI2 NSS/SCK/MISO/MOSI : PB12/PB13/PB14/PB15

  • USER_PB : PC13

  • LD4 : PA5

  • PWM : PA6

  • ADC1 IN0 : PA0

  • ADC1 IN1 : PA1

  • DAC1_OUT1 : PA4

For mode details please refer to STM32 Nucleo-64 board User Manual 3.

Programming and Debugging

Applications for the nucleo_g0b1re board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

Nucleo G0B1RE board includes an ST-LINK/V2-1 embedded debug tool interface.

This interface is not yet supported by the openocd version included in the Zephyr SDK. But JLink, STM32CubeProgrammer and Pyocd interfaces are supported. Pyocd support is currently limited: As the stm32g0b1 target causes issues, the stm32g071 target is used. For STM32G0 support pyocd needs additional target information, which can be installed by adding “pack” support with the following pyocd command:

$ pyocd pack --update
$ pyocd pack --install stm32g0

Flashing an application to Nucleo G0B1RE

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b nucleo_g0b1re 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_g0b1re samples/hello_world
west debug