CLICKER2

date	version	author	Remark
2016-08-27	1.0	Roland van Straten	initial port
2016-12-10	1.1	Roland van Straten	Use UART Pin definitions
2018-06-24	1.2	Roland van Straten	updated to latest micropython

CLICKER2 is a STM32F407VGT6 based board that features two module connectors, two switches, two LEDs, and a single cell Li-Ion battery charger.

More information: mikroe clicker2 website

How to add this port to micropython?

Following assumes that the path to micropython local repository is at $HOME/workspace/.

$ cd $HOME/workspace/micropython/ports/stm32/boards
$ git clone https://github.com/rolandvs/CLICKER2.git
$ cd ..
$ make BOARD=CLICKER2

Board specific changes

Added directories:

• stm32/boards/CLICKER2/ with all board specific files
• stm32/boards/CLICKER2/docs/ with additional information
• stm32/boards/CLICKER2/modules/ with a board support package that could be frozen

micropython patch

There is a single patch needed to micropython to add an additional memory segment to the internal /flash drive.

• In the ports/stm32/flashbdev.c there is an extra segment of Flash memory available. This has been changed in a configurable item using #define MICROPY_HW_FLASH_EXTRA (1) in the mpconfigboard.h. In the flashbdev.c replacing #if (0) by #if defined(MICROPY_HW_FLASH_EXTRA).

Board IO Pins

Board Label	CPU Pin	Description
LD1	PE12	LED 1 (left), active low
LD2	PE15	LED 2 (right), active low
SW	PE0	PYB switch, active low
T2	PE0	left switch, active low
T3	PA10	right switch, active low
SENSEL	PB12	select the battery measurement circuit, active low
VSENSE	PC5	the battery voltage ADC channel, scaled 1/3 of battery voltage
FAULT	PC6	status of the FAULT pin, active low
BATSTAT	PD4	status of the CHARGE pin, active low

Board Support Package

A small BSP package is placed in ports/stm32/boards/CLICKER2/modules/ and can be used like:

import bsp
clicker2 = bsp.BSP()

Some code to exercise the functions is executed through execfile('bsp.py').

The functions are:

ReadBatteryVoltage()

The battery voltage will return the voltage measured at the battery using a voltage divider.

batval = clicker2.ReadBatteryVoltage()
print("Battery voltage is: {:4.2f}.".format(batval))

ReadChargerStatus()

This reads the two status pins /CHARGE and /FAULT of the power supply and returns them.

charge, fault = clicker2.ReadChargerStatus()

IsChargerActive()

Returns True if charging.

charge = clicker2.IsChargerActive()

IsFaultActive()

Returns True if power supply generates a fault signal.

charge = clicker2.IsFaultActive()

IsButtonxPressed()

Return True if button is pressed.

SW1 = clicker2.IsButton1Pressed()
SW2 = clicker2.IsButton2Pressed()