System Workbench for STM32

Hi,

there exists a Doxygen based API description for each version of the so called Firmware Package for the specific MCU. The format is compressed HTML.
It can be found for instance in the subfolder STM32Cube_FW_L4_V1.5.0\Drivers\STM32L4xx_HAL_Driver.

You have to check where these packages are installed. Using Cube you can found the folder if you select a already installed firmware package for removing. (Help -> Install New Libraries -> ...).

On Windows based systems it is typically located below c:\Users\\STM32Cube\Repository.

Best Regards,
Jodus