.. _nucleo_g071rb_board:

ST Nucleo G071RB
################

Overview
********
The Nucleo G071RB board features an ARM Cortex-M0+ based STM32G071RB MCU
with a wide range of connectivity support and configurations. Here are
some highlights of the Nucleo G071RB board:

- 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
- 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 (LD4), power LED (LD3)
- Two push-buttons: USER and RESET

.. image:: img/nucleo_g071rb.jpg
   :width: 500px
   :height: 367px
   :align: center
   :alt: Nucleo G071RB

More information about the board can be found at the `Nucleo G071RB website`_.

Hardware
********
Nucleo G071RB provides the following hardware components:

- STM32 microcontroller in LQFP64 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 (LD4), 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 STM32G071RB can be found here:

- `G071RB on www.st.com`_
- `STM32G071 reference manual`_


Supported Features
==================

The Zephyr nucleo_g071rb 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             |
+-----------+------------+-------------------------------------+
| FLASH     | on-chip    | flash memory                        |
+-----------+------------+-------------------------------------+
| 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_g071rb/nucleo_g071rb_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`_.

Programming and Debugging
*************************

Applications for the ``nucleo_g071rb`` board configuration can be built and
flashed in the usual way (see :ref:`build_an_application` and
:ref:`application_run` for more details).

Flashing
========

Nucleo G071RB board includes an ST-LINK/V3 embedded debug tool interface.

Flashing an application to Nucleo G071RB
----------------------------------------

Here is an example for the :ref:`blinky-sample` application.

.. zephyr-app-commands::
   :zephyr-app: samples/basic/blinky
   :board: nucleo_g071rb
   :goals: build 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
:ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: nucleo_g071rb
   :maybe-skip-config:
   :goals: debug

References
**********

.. target-notes::

.. _Nucleo G071RB website:
   http://www.st.com/en/evaluation-tools/nucleo-g071rb.html

.. _STM32G071 reference manual:
   http://www.st.com/resource/en/reference_manual/dm00371828.pdf

.. _STM32 Nucleo-64 board User Manual:
   http://www.st.com/resource/en/user_manual/dm00452640.pdf

.. _G071RB on www.st.com:
   http://www.st.com/en/microcontrollers/stm32g071rb.html