STM32VL Discovery

Overview

The STM32 Discovery series comes in many varieties, in this case the “Value Line” STM32F100x SoC series is showcased. Like other Discovery board, an integrated ST-LINK debugger and programmer is included (V1), but the only included I/O devices are two user LEDs and one user button.

More information about the board can be found at the STM32VLDISCOVERY website [1].

Hardware

The STM32 Discovery board features:

  • On-board ST-LINK/V1 with selection mode switch to use the kit as a standalone ST-LINK/V1 (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

More information about the STM32F100x can be found in the STM32F100x reference manual [2] and the STM32F100x data sheet [3].

Supported Features

The stm32vl_disco board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

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

  • UART_3_TX : PB10

  • UART_3_RX : PB11

  • SPI1_NSS : PA4

  • SPI1_SCK : PA5

  • SPI1_MISO : PA6

  • SPI1_MOSI : PA7

  • SPI2_NSS : PB12

  • SPI2_SCK : PB13

  • SPI2_MISO : PB14

  • SPI2_MOSI : PB15

  • I2C1_SCL : PB6

  • I2C1_SDA : PB7

  • I2C2_SCL : PB10

  • I2C2_SDA : PB11

For more details please refer to STM32VLDISCOVERY board User Manual [4].

Programming and Debugging

The stm32vl_disco board supports the runners and associated west commands listed below.

flash debug

Applications for the stm32vl_disco board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

STM32VLDISCOVERY board includes an ST-LINK/V1 embedded debug tool interface. This interface is supported by the openocd version included in the Zephyr SDK.

Flashing an application

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b stm32vl_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 Blinky application.

# From the root of the zephyr repository
west build -b stm32vl_disco samples/basic/blinky
west debug

USB mass storage issues

The ST-LINK/V1 includes a buggy USB mass storage gadget. To connect to the ST-LINK from Linux, you might need to ignore the device using modprobe configuration parameters:

$ echo "options usb-storage quirks=483:3744:i" | sudo tee /etc/modprobe.d/local.conf
$ sudo modprobe -r usb-storage

References