In this video I explain as simple as possible how you can start programming the STM32F103C8T6 microcontroller (Blue Pill). It’s cheap and very fast….. But be aware of the 32-bit pitfalls.
There is also a community forum for Arduino on STM32: http://www.stm32duino.com
My video about direct port manipulation in Arduino
https://youtu.be/648Tx5N9Zoc
I bought the STM32F103C8T6 here:
http://www.dx.com/p/stm32f103c8t6-arm-ccortex-m3-stm32-minimum-system-board-blue-435108?Utm_rid=78761898&Utm_source=affiliate
And also the FTDI programmer:
http://www.dx.com/p/crius-ftdi-basic-breakout-5v-usb-to-ttl-6-pin-module-for-mwc-multiwii-lite-se-228307?Utm_rid=78761898&Utm_source=affiliate
The Arduino_STM32 project of Roger Clark on GitHub
https://github.com/rogerclarkmelbourne/Arduino_STM32