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ST STM32F3 Discovery


The STM32F3DISCOVERY Discovery kit features an ARM Cortex-M4 based STM32F303VC MCU with everything required for beginners and experienced users to get started quickly. Here are some highlights of the STM32F3DISCOVERY board:

  • STM32 microcontroller in LQFP100 package

  • Extension header for all LQFP100 I/Os for quick connection to prototyping board and easy probing

  • On-board, ST-LINK/V2 for PCB version A or B or ST-LINK/V2-B for PCB version C and newer, debugger/programmer with SWD connector

  • Board power supply: through USB bus or from an external 3 V or 5 V supply voltage

  • External application power supply: 3 V and 5 V

  • Ten LEDs:

    • 3.3 V power on (LD1)

    • USB communication (LD2)

    • Eight user LEDs: red (LD3/LD10), blue (LD4/LD9), orange (LD5/LD9) and green (LD6/LD7)

  • Two push-buttons: USER and RESET

  • USB USER with Mini-B connector

  • L3GD20, ST MEMS motion sensor, 3-axis digital output gyroscope

  • LSM303DLHC, ST MEMS system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor


More information about the board can be found at the STM32F3DISCOVERY website.


STM32F3DISCOVERY Discovery kit provides the following hardware components:

  • STM32F303VCT6 in LQFP100 package

  • ARM® 32-bit Cortex® -M4 CPU with FPU

  • 72 MHz max CPU frequency

  • VDD from 2.0 V to 3.6 V

  • 256 KB Flash

  • 40 KB SRAM

  • Routine booster: 8 Kbytes of SRAM on instruction and data bus

  • GPIO with external interrupt capability

  • 4x12-bit ADC with 39 channels

  • 2x12-bit D/A converters

  • RTC

  • General Purpose Timers (13)

  • USART/UART (5)

  • I2C (2)

  • SPI (3)

  • CAN

  • USB 2.0 full speed interface

  • Infrared transmitter

  • DMA Controller

More information about STM32F303VC can be found here:

Supported Features

The Zephyr stm32f3_disco board configuration supports the following hardware features:






nested vector interrupt controller



serial port-polling; serial port-interrupt















USB device






Independent WatchDoG




Other hardware features are not yet supported on Zephyr porting.

The default configuration can be found in the defconfig file:


Pin Mapping

STM32F3DISCOVERY Discovery kit has 6 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.

For mode details please refer to STM32F3DISCOVERY board User Manual.

Default Zephyr Peripheral Mapping:

  • UART_1_TX : PC4

  • UART_1_RX : PC5

  • UART_2_TX : PA2

  • UART_2_RX : PA3

  • I2C1_SCL : PB6

  • I2C1_SDA : PB7

  • I2C2_SCL : PA9

  • I2C2_SDA : PA10

  • SPI1_NSS : PA4

  • SPI1_SCK : PA5

  • SPI1_MISO : PA6

  • SPI1_MOSI : PA7

  • SPI2_NSS : PB12

  • SPI2_SCK : PB13

  • SPI2_MISO : PB14

  • SPI2_MOSI : PB15

  • CAN1_RX : PD0

  • CAN1_TX : PD1

  • USB_DM : PA11

  • USB_DP : PA12

  • USER_PB : PA0

  • LD3 : PE9

  • LD4 : PE8

  • LD5 : PE10

  • LD6 : PE15

  • LD7 : PE11

  • LD8 : PE14

  • LD9 : PE12

  • LD10 : PE13

  • PWM : PA8

System Clock

STM32F3DISCOVERY System Clock could be driven by internal or external oscillator, as well as main PLL clock. By default System clock is driven by PLL clock at 72 MHz, driven by 8 MHz MCO from the ST Link.

Serial Port

STM32F3DISCOVERY Discovery kit has up to 5 UARTs. The Zephyr console output is assigned to UART1. Default settings are 115200 8N1.


STM32F3DISCOVERY has up to 2 I2Cs. I2C1 is connected to the LSM303DLHC and is an ultra-compact low-power system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor.


STM32F3DISCOVERY has a USB 2.0 full-speed device interface available through its mini USB connector (USB USER).


The STM32F3DISCOVERY does not have an onboard CAN transceiver. In order to use the CAN bus on the this board, an external CAN bus tranceiver must be connected to PD0 (CAN1_RX) and PD1 (CAN1_TX).

Programming and Debugging


STM32F3DISCOVERY Discovery kit includes a ST-LINK/V2 or ST-LINK/V2-B embedded debug tool interface.

Applications for the stm32f3_disco board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing an application to STM32F3DISCOVERY

First, connect the STM32F3DISCOVERY Discovery kit to your host computer using the USB port to prepare it for flashing. Then build and flash your application.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b stm32f3_disco samples/hello_world
west flash

Run a serial host program to connect with your board. For PCB version A or B a TTL(3.3V) serial adapter is required. For PCB version C and newer a Virtual Com Port (VCP) is available on the USB ST-LINK port.

$ minicom -D /dev/<tty device>

Replace <tty_device> with the port where the STM32F3DISCOVERY board can be found. For example, under Linux, /dev/ttyUSB0.

You should see the following message on the console:

Hello World! arm


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 stm32f3_disco samples/hello_world
west debug