System Workbench for STM32

Hi,

You can have a look in the GPIO examples in CUBE HAL L4.
I don't know if they use BSSRR reg but at least there is a GPIO toggle example.
You can import it in SW4STM32.

Also for STM32L4R5ZI SD card, you can have a look in the demo or in the FatFs Application in the cube L4 (Disco or Eval L4R9I).

Rgds,
Laurent