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 STM32F0 Discovery


The STM32F0 Discovery development board uses an STM32F051R8T6 MCU and integrates the ST-LINK/V2-1 debugger and programmer. It also comes with a comprehensive STM32 software HAL library and various packaged software examples.


More information about the board can be found at the STM32F0DISCOVERY website 1.


The STM32 Discovery board features:

  • STM32F051R8T6 microcontroller featuring 64 KB Flash memory, 8 KB RAM in an LQFP64 package

  • On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging)

  • Board power supply: through USB bus or from an external 5 V supply voltage

  • External application power supply: 3 V and 5 V

  • Four LEDs:

    • LD1 (red) for 3.3 V power on

    • LD2 (red/green) for USB communication

    • LD3 (green) for PC9 output

    • LD4 (blue) for PC8 output

  • Two push buttons (user and reset)

  • Extension header for all LQFP64 I/Os for quick connection to prototyping board and easy probing

  • An additional board is provided which can be connected to the extension connector for even easier prototyping and probing.

  • Comprehensive free software including a variety of examples, part of STM32CubeF0 package or STSW-STM32049 for legacy Standard Libraries usage

More information about STM32F051R8 can be found in the STM32F0x8 reference manual 2.

Supported Features

The Zephyr stm32f0_disco board configuration supports the following hardware features:






nested vector interrupt controller



serial port-polling; serial port-interrupt









reset and clock control



flash memory



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/stm32f0_disco/stm32f0_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_1_TX : PA9

  • UART_1_RX : PA10

  • UART_2_TX : PA2

  • UART_2_RX : PA3

For mode details please refer to STM32F0DISCOVERY board User Manual 3.

Programming and Debugging

Applications for the stm32f0_disco board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).


STM32F0DISCOVERY 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 F030R8

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b stm32f0_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 Blinky application.

# From the root of the zephyr repository
west build -b stm32f0_disco samples/basic/blinky
west debug