Sorry, I made a mistake in the title 
My card is Grove - I2C Motor Driver (L298P) with STM32f030f4P6
it is NOT Grove - I2C Motor Driver V1.3 as stated in the title (with atmega8)
I didn’t find how to change the title (maybe I aml not allowed to).
What I understand from the wiki: the library is the same for Grove - I2C Motor Driver (L298P) and Grove - I2C Motor Driver V1.3
There is not firmware available for the STM32 in the wiki.
Can somebody provide the firmware (or better an upgraded firmware)?