Clicker 2 for STM32

Overview

MikroE Clicker 2 for STM32 is a development board containing an STM32F407 microcontroller. It is equipped with two mikrobus sockets and furthermore has two headers for general signal break out. The board also has battery connection and a battery management unit on board. It can be powered either from a battery pack, such as a LiPo or from USB. The board is equipped with a 25MHz crystal as well as a 32.768kHz clock crystal.

Hardware

The Clicker 2 board contains the following connections:

Two MikroBUS connectors

Two headers with general connections

Furthermore the board contains two LEDs and two push buttons that are connected to the microcontroller.

Supported Features

The Zephyr MikroE Clicker 2 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
I2C	on-chip	i2c
SPI	on-chip	spi
ADC	on-chip	adc
USB	on-chip	usb

Other hardware features have not been enabled yet for this board.

The default configuration can be found in boards/mikroe/clicker_2/mikroe_clicker_2_defconfig

Connections and IOs

The two mikroBUS interfaces are aliased in the device tree so that their peripherals can be accessed using mikrobus_N_INTERFACE so e.g. the spi on bus 2 can be found by the alias mikrobus_2_spi. The counting corresponds with the marking on the board.

For connections on the edge connectors, please refer to Clicker 2 for STM32 User Manual.

Programming and Debugging

Applications for the mikroe_clicker_2 board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

The initial state of the board is set to lock. When you flash, it will fail with the message:

Error: stm32x device protected

Unlocking with openocd makes it possible to flash.

$ openocd -f /usr/share/openocd/scripts/interface/stlink-v2.cfg \
    -f /usr/share/openocd/scripts/target/stm32f4x.cfg -c init\
    -c "reset halt" -c "stm32f4x unlock 0" -c "reset run" -c shutdown

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b mikroe_clicker_2 samples/hello_world
west flash

You should see the following message on the console:

Hello World! mikroe_clicker_2

Debugging

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 mikroe_clicker_2 samples/hello_world
west debug