High power, all in one Arduino shield

Perhaps I misunderstand your comment, but I believe you might be mixing the software framework/toolchain (Arduino) with an MCU family (ST Micro’s line of hardware).

You mean there isn’t such a shield that sits on top of Microchip ATmega328P microcontroller in the “Arduino” footprint? Yes, there isn’t. The 328P isn’t fast enough to support this and the footprint is too small to allow for such a shield. We did develop something like close to that though, you may want to have a look:

Again, perhaps we are mixing AT386p with Arduino toolchain?

Any real-time control algorithm will prevent you from doing that, as it would disrupt the motor control loop.

Cheers,
Valentine