/* 
Based on Arduino Discussion:
https://forum.arduino.cc/t/change-stepper-dir-according-to-predifined-analog-input-value
https://forum.arduino.cc/t/stepper-driver-with-quadrature-from-stepper-h-or-encoder

Clock - XOR Stepper Driver:

Note: Possibly the XOR logic implementation or the scope sampling is creating the timing
      issue as seen on the scope, but it still appears to work - D. Lloyd

      A4988:  DIR | STEP
    Encoder: PinA | PinB
    Encoder:  CLK | DT
  Gray Code: Bit0 | Bit1
2 Input XOR:    A | Out
                0 | 0
                1 | 0
                1 | 1
                0 | 1
Other: micros() to Gray Code conversion.
*/

void setup() { }
void loop() { }