STM32F103 Mini

Overview

The STM32F103_MINI board features an ARM Cortex-M3 based STM32F103RC MCU with a wide range of connectivity support and configurations. There are multiple version of this board like stm32f103_mini.

Hardware

STM32F103 Mini provides the following hardware components:

STM32 microcontroller in QFP64 package
Flexible board power supply:
- USB VBUS or external source (3.3V, 5V, 7 - 12V)
- Power management access point
Two LEDs:
- User LED (LD1), power LED (LD2)
USB re-enumeration capability:
- Mass storage

More information about STM32F103RC can be found here:

Supported Features

The Zephyr stm32f103_mini 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
PINMUX	on-chip	pinmux
GPIO	on-chip	gpio
CLOCK	on-chip	reset and clock control
FLASH	on-chip	flash memory
WATCHDOG	on-chip	independent watchdog
ADC	on-chip	ADC Controller
PWM	on-chip	pwm
SPI	on-chip	spi
USB	on-chip	USB device
COUNTER	on-chip	rtc
RTC	on-chip	rtc

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

The default configuration can be found in the defconfig file: boards/arm/stm32f103_mini/stm32f103_mini_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.

Board connectors:

Default Zephyr Peripheral Mapping:

UART_1 TX/RX: PA9/PA10
UART_2 TX/RX: PA2/PA3 (ST-Link Virtual COM Port)
SPI1 NSS/SCK/MISO/MOSI: PA4/PA5/PA6/PA7
SPI2 NSS/SCK/MISO/MOSI: PB12/PB13/PB14/PB15
I2C1 SDA/SCL: PB9/PB8
PWM1_CH1: PA8
USER_PB: PC13
LD1: PA5
USB_DC DM/DP: PA11/PA12

System Clock

The on-board 8MHz crystal is used to produce a 72MHz system clock with PLL.

Programming and Debugging

Applications for the stm32f103_mini board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

There are 2 main entry points for flashing STM32F1X SoCs, one using the ROM bootloader, and another by using the SWD debug port (which requires additional hardware such as ST-Link). Flashing using the ROM bootloader requires a special activation pattern, which can be triggered by using the BOOT0 pin.

Flashing an application to stm32f103 mini

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b stm32f103_mini 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 stm32f103_mini samples/basic/blinky
west debug