Den

DFU

• Bootloader for STM32F103 boards, for use with the Arduino_STM32 repo and the Arduino IDE: https://github.com/rogerclarkmelbourne/STM32duino-bootloader/blob/master/binaries/maple_mini_boot20.bin

• Donwload DFU bootloader from https://github.com/devanlai/dapboot. I tried this but I didn’t manage to start a bootloader on the board by pressing boot0 and reset.

• Maple DFU: https://github.com/jonatanolofsson/maple-bootloader
• LeafLabs DFU: http://github.com/leaflabs/maple-bootloader

Flashing

There is 2 ways to flash a firmware to the STM32F103

• built-in bootloader that allows to download firmware over UART + stm32loader.py
• STLinkv2 + OpenOCD

Flash DFU using STLinkv2

DFU=dapboot-v1.20-maplemini.bin
OOCD_INTERFACE=interface/stlink-v2.cfg
OOCD_BOARD=target/stm32f1x.cfg

openocd -f $OOCD_INTERFACE -f $OOCD_BOARD \
            -c "init" -c "reset init" \
            -c "stm32f1x unlock 0; reset halt" \
            -c "flash erase_sector 0 0 last" \
            -c "flash write_image erase ${DFU:?DFU is not set} 0x08000000" \
            -c "reset"

DFU Boot

On MapleMini press and hold a user button that is connected to PB8/BOOT0

And then press reset for a short time.

It has to boot into the DFU bootloader that allows to upgrade a firmware.

dfu-util

there is dfu-util tool that could be used to upload firmware.

brew install dfu-util

or run apt-get alternative on Debian based distros.

It detects my dev board

engineer@mybook13 Downloads % dfu-util -l
dfu-util 0.11

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2021 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Found DFU: [1209:db42] ver=0111, devnum=28, cfg=1, intf=0, path="20-2", alt=0, name="DAPBoot DFU", serial="394908875083555055FF6B06"

WebUSB

There is a webusb api that allows to flash MCU using Browser and JS API. Here is a demo web app

Create plarform.io project

I created a simple timer project using Platform.io Arduino-compatible abstractions for STM32F103 and configured to upload a firmware over DFU bootloader in platform.ini

[env:maple_mini_origin]
platform = ststm32
board = maple_mini_origin
framework = arduino
upload_protocol = dfu