Interfacing TMC2100 Stepper Motor Driver with Arduino

   /*
  TMC2100 -Stepper-Motor-Driver-Module
  made on 2 Dec 2020
  by Amir Mohammad Shojaee @ Electropeak
  
Home

  
*/

const int dirPin = 2;
const int stepPin = 3;
const int stepsPerRevolution = 3200;

int incomingByte = 0; // for incoming serial data
int  input = 0;

void setup() {

  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  
  Serial.begin(9600); // opens serial port, sets data rate to 9600 bps

  Serial.println("1.full rotation in forward");
  Serial.println("2.full rotation in backward");
}

void loop() {

  // send data only when you receive data:
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
    input = incomingByte ; 

  switch (input) { 
    case '1':         // if input=1 ....... motors turn forward
      forward();
      break;
    case '2':         // if input=2 ....... motors turn backward
      backward();
      break;
  }
  delay(200);
  input=0;
}
}
void forward() {          //function of forward 
  digitalWrite(dirPin, HIGH);

 
  for(int x = 0; x < stepsPerRevolution; x++)
  {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(100);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(100);
  }
  delay(1000); // Wait a second
}

void backward() {         //function of backward
  digitalWrite(dirPin, LOW);

 
  for(int x = 0; x < stepsPerRevolution; x++)
  {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(100);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(100);
  }
  delay(1000); // Wait a second
}