reworked motor code

#include <stdint.h>

#define In1   7
#define In2  13
#define pwm1 12
#define pwm2  8

void setup() {
  // put your setup code here, to run once:

  pinMode (In1,  OUTPUT);
  pinMode (In2,  OUTPUT);
  pinMode (pwm1, OUTPUT);
  pinMode (pwm2, OUTPUT);

  digitalWrite (In1,LOW);
  digitalWrite (In2,LOW);
}

void motor_dir (bool dir) {
  if (dir) {
    digitalWrite (In1, HIGH);
    digitalWrite (In2,  LOW);
  }
  if (!(dir)) {
    digitalWrite (In1, LOW);
    digitalWrite (In2, HIGH);
  }
}

void motor_setup (uint16_t speed_hz, uint16_t time_ms, bool dir) {
  uint16_t speed_ms = 1000/speed_hz;

  motor_dir (dir);
  uint32_t startTime = millis ();
  while (millis () - startTime < time_ms){
    if (dir){
      digitalWrite (pwm2, HIGH);
      delay (speed_ms-2);
      digitalWrite (pwm2, LOW);
      delay (speed_ms-2);
    }
    if (!(dir)){
      digitalWrite (pwm1, HIGH);
      delay (speed_ms-2);
      digitalWrite (pwm1, LOW);
      delay (speed_ms-2);
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  bool dir;

  dir = 1;
  motor_setup (2, 1000, dir);
  dir = 0;
  motor_setup (2, 1000, dir);
}