I cannot see if the FAULT light up from the video, can you make another video where the whole driver board is visible? I want to see the LED.
Also, lower the voltage and speed to 4.
float target_velocity = 4.0;
float target_voltage = 4.0;
It seems we are making good progress, yes.
Cheers,
Valentine
PS: Do you have an oscilloscope in your lab in Kyoto? It will help if you disconnect the motor, and only run the driver board without a motor and measure the output phases on the oscilloscope.