Other STM32 Arduino projects

There are quite a few other Arduino STM32 projects, some of which may be beneficial to this project or anyone using this project

https://github.com/danieleff/STM32GENERIC Generic approach to STM32 boards started in April 2017. See this thread on the forum for details.

https://github.com/avikde/koduino New development to GitHub at the start of December 2014. Currently only supports STM32F3xx series. There is intended support for STM32F4xxg . Looks to be one to watch.

https://github.com/BestU/STM32_for_Arduino_BSP New in as of December 2014. Appears only to support STM32F051C8T6. I'm not sure if there is support for SPI or I2C

https://github.com/MakerLabMe/STM32_Arduino_Cores. Seems to have been abandoned. I tried to contact the author via a GitHub issue at the beginning of December 2014 but have not had a reply.

https://github.com/leaflabs/libmaple the original source for this project. Still gets occasional updates. As far as I'm aware the author (Marti) plans support for STM32F4xx at some time, however as far as I can tell it still uses the old Arduino API 0022 and hence won't work with most current Arduino code.