add 3-phase; add interrupt method/flag; add yield #1
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3-phase motor such as common HDD or FDD motor
Note: tie common wire LOW, or invert control signals and tie common to +V
interrupt() method allows external user code to interrupt long-running otherwise-blocking while() loop in
void Stepper::step(int steps_to_move)
yield() in same while loop avoids WDT-timeout crashes on some controllers, such as Heltec's wifi kit 32