An open-source firmware for the STM32 co-processor on the Shelly Dimmer.

Pre-build binary

See the releases page to download the latest pre-build binary.

Instructions

1. git clone --recurse-submodules https://github.com/jamesturton/shelly-dimmer-stm32.git
2. cd shelly-dimmer-stm32
3. make -C libopencm3 # (Only needed once)
4. make -C src

If you have an older git, or got ahead of yourself and skipped the --recurse-submodules
you can fix things by running git submodule update --init (This is only needed once)

To flash the firmware directly to the STM32 chip using a programmer such as the Black Magic Probe (ST-Link could also be used):

5. make -C src flash BMP_PORT=/dev/ttyBmpGdb

To convert the binary firmware file to a header file for use in Tasmota firmware use the binary-parser utility in tthe scripts directory:

6. gcc scripts/binary-parser.c -o scripts/binary-parser
7. chmod +x scripts/binary-parser
8. scripts/binary-parser src/shelly-dimmer-stm32.bin shelly-dimmer-stm32.h 50 1

Pinout

Here is a guess of the pinout of the STM32F031K6 chip.

Useful links

• HLW8012 Information
• STM32F031 Reference manual