stb
  
Directive 'device'
Parameters:  
  1. mcu

Directive 'layers'
Sub-directive 'layers.hal'
Parameters:
  1. path
Sub-sub-directive 'layers.hal.modules'
Parameters:
  1. rcc
  2. gpio
  3. spi
  4. i2c
  5. dma
  6. pwr
  and so on...

Sub-directive 'layers.cmsis'
Parameters:
  1. path

Directive 'dependencies'
links to GitHub repos what you want to make the sub modules in your project