Hi Antun,
I have still problems with that BGC-clones, but this is not about the library.
I bought a couple of that boards in different configurations but all of them has their own errors.
At the first I recognized that they have no over-current protection. Was a funny firework.
The second (when asking you for help) had no power supply at the SPI interface. The third failed after sending new code a couple of times.
Meanwhile I decided to stop further tries with the boards because it is a waste of time. Beside of all problems they can not handle low-resistant motors in a adequate way.
So, sorry for asking, at all. BGC-Clones are not useful for professional applications.