//const int MS1 = 0;  //PIN per regolare lo stepper corrisponde 1.8 gradi/step
//const int MS2 = 0;
//const int MS3 = 0;
#define DIR 9

#define CS 8  //chip select pin on off al motore
#include <SPI.h> // Call library
int i_goal = 100;
int k=0; //-pi/2 espresso in steps (un quarto degli steps totali che equivalgono a 360 gradi)
void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
  // initialize digital pin LED_BUILTIN as an output.
  SPI.begin(); // initialization of SPI interface
  SPI.setDataMode(SPI_MODE0); // configuration of SPI communication in mode 0
  SPI.setClockDivider(SPI_CLOCK_DIV16); // configuration of clock at 1MHz
  pinMode(CS, OUTPUT); //setting chip select as output
}

void loop() {
  digitalWrite(DIR, HIGH);
  for (int i = 0; i <100 ; i++) //repeat for every value from 0 to 255
  {
    digitalWrite(CS, LOW); // activation of CS line
    delayMicroseconds(15);
    digitalWrite(CS, HIGH);
    delay(50); 
  }
}