anchor.diff:  ====
   
   (u32 input) pin
  +[indent=4]
   ====
   I/O pin to use for the pwm output
   ====
  
positive.code: ====
  
  (u32 input) step_pin
  ====
  I/O pin to use for the step output
  ====
  
  (u32 input) dir_pin
  ====
  I/O pin to use for the direction output
  ====
  
  (bit input) stepinvert
  ====
  Inverts the step output (normally high with pulses going low)
  ====
  
negative.code: ====
  
  (u32 input) B-pin
  [indent=4]
  ====
  PRU direct input pin to use for the B signal
  ====
  