@neiru37, which FW are you running ? Check my librairies here : https://drive.google.com/open?id=13ZL37tD0YRZzcL2XTEyNG4uAA-xMj4O9
Regarding the buffer size, I’m still struggling to have it working even after had modified the Arduino core 
BTW, I opened an issue on Vedder’s BLDC repo. Will see…