Rust auto turret swipe Digispark/Attiny85

// Turret code for the Digispark / Attiny85 microcontroller
//This code is based on the example "Sweep" from SoftRcPulseOut library, modify at will!

#include <SoftRcPulseOut.h>
SoftRcPulseOut myservo;
#define SERVO_PIN   0  // assigns signal pin for servo (pin 0)

#define NOW    1
int spd = 40; // time between each degree of angle, higher time means slower speed
int i = 0;
int k = 0;
int ang = 90;



void setup()
{
  myservo.attach(SERVO_PIN);  // attaches the servo on pin defined by SERVO_PIN to the servo object
  myservo.write(ang);
  delay(1000);
  SoftRcPulseOut::refresh(NOW); //
  ang = 45;
}


void loop()
{
  for(i = 0; i < 90; i++)          //sweeps to one side 90 degrees
  {
    myservo.write(ang+i);
    delay(spd);
    SoftRcPulseOut::refresh(NOW);
  }
  delay(1000);

  for(k = 89; k>-1; k--)       //sweeps to the other side 90 degrees
  {
    myservo.write(ang+k);
    delay(spd);
    SoftRcPulseOut::refresh(NOW);
  }
  delay(1000);
}