DirA:        0*L->H,        1*H->L
    DirB:        1*L->H,        0*H->L
 EnableA:        3*L->H,        2*H->L
 EnableB:        0*L->H,        0*H->L
   StepA:     1050*L->H,     1050*H->L, Max High=9us Total High=4119us
   StepB:        2*L->H,        2*H->L, Max High=4us Total High=9us
Position[A]=0

Position[B]=2

Time in EnableA  max=4204 us, total=8409 us

Time in FillISR  max=1917 us, total=25558 us

Time in StepA  max=9 us, total=4119 us

Time in StepB  max=4 us, total=9 us

Time in StepISR  max=5 us, total=4224 us