The STM32 family of 32-bit Flash MCUs based on the ARM Cortex-M processor is designed to offer new degrees of freedom to MCU users. It offers a 32-bit product range that combines very high performance, real-time capabilities, digital signal processing, and low-power, low-voltage operation, while maintaining full integration and ease of development.

• Home (home page in PlatformIO Platform Registry)
• Documentation (advanced usage, packages, boards, frameworks, etc.)

1. Install PlatformIO
2. Create PlatformIO project and configure a platform option in platformio.ini file:

[env:stable]
platform = ststm32
board = ...
...

[env:development]
platform = https://github.com/platformio/platform-ststm32.git
board = ...
...

Please navigate to documentation.