This is the documentation for the latest (master) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

ST STM32G071B Discovery

Overview

The STM32G071B-DISCO Discovery board is a demonstration and development platform for the STMicroelectronics Arm® Cortex® -M0+ core-based STM32G071RB USB Type-C™ and Power Delivery microcontroller. The STM32G071B-DISCO Discovery board is presented with all necessary interfaces for easy connection and interoperability with other USB Type-C™ devices. The STM32G071B-DISCO Discovery board is intended for discovery and display of USB Type-C™ port characteristics such as data role, power role, VBUS and IBUS monitoring. It offers an advanced user mode when associated with the STM32CubeMonUCPD software GUI and can be used as a USB Type-C™ and Power Delivery analyzer.

  • STM32G071RBT6 microcontroller featuring 128 Kbytes of Flash memory and 32 Kbytes of RAM in LQFP64 package

  • Plastic case

  • 1” 128 x 64 pixels OLED LCD module with SPI interface

  • USB Type-C™ interface plug cable and receptacle connector accessible by door with reed sensor detection

  • 3 bidirectional current and power monitors with I2C interface to measure VBUS, CC1 and CC2 protected and isolated lines

  • On-board DC/DC converter to sustain power supply with VBUS varying from 3 V to 20 V (+/- 5 %)

  • 4 user status LEDs about USB Type-C™ configuration

  • 3 LEDs for power and ST-LINK communication

  • 4-way joystick with selection button

  • 1 reset push-button

  • Board external connectors:
    • USB Type-C™ plug cable

    • USB Type-C™ receptacle connector

    • 8-pin user extension connector including ADC, SPI, USART and I2C communication signals

    • USB with Micro-AB (ST-LINK)

  • Board internal connectors:
    • 2 x 8-pin GPIOs free pins from microcontroller

      (accessible internally when case is removed)

    • USB Type-C™ test points for main signals

  • Flexible power-supply options: ST-LINK USB VBUS or USB Type-C™ VBUS

  • On-board ST-LINK/V2-1 debugger/programmer with USB enumeration capability: mass storage, Virtual COM port and debug port

STM32G071B-DISCO

More information about the board can be found at the STM32G071B-DISCO website 1.

More information about STM32G071RB can be found here: - G071RB on www.st.com 4 - STM32G071 reference manual 2

Supported Features

The Zephyr stm32g071b_disco 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

GPIO

on-chip

gpio

WATCHDOG

on-chip

independent watchdog

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

The default configuration can be found in the defconfig file: boards/arm/stm32g071b_disco/stm32g071b_disco_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_3 TX/RX : PC10/PC11 (ST-Link Virtual Port Com)

  • BUTTON (JOY_SEL) : PC0

  • BUTTON (JOY_LEFT) : PC1

  • BUTTON (JOY_DOWN) : PC2

  • BUTTON (JOY_RIGHT) : PC3

  • BUTTON (JOY_UP) : PC4

  • LED (TO_REC) : PD9

  • LED (TO_PLUG) : PD8

  • LED (SINK_SPY) : PD5

  • LED (SOURCE) : PC12

For mode details please refer to STM32G0 Discovery board User Manual 3.

Programming and Debugging

Applications for the stm32g071b_disco board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

The STM32G071B Discovery board includes an ST-LINK/V2-1 embedded debug tool interface.

$ west flash

Flashing an application to the STM32G071B_DISCO

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b stm32g071b_disco 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 stm32g071b_disco samples/hello_world
west debug