ST STM32G071B Discovery


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


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

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

Supported Features

The Zephyr stm32g071b_disco board configuration supports the following hardware features:






nested vector interrupt controller



serial port-polling; serial port-interrupt






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)






  • 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).


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.


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