#include <RTClib.h>

#define USING_DS3231 0 // mettre à 1 pour la DS3231

#if USING_DS3231
RTC_DS3231 rtc;
#else
RTC_DS1307 rtc;
#endif

// Motor and clock parameters
// 2048 * 90 / 12 = 15360
#define STEPS_PER_ROTATION 15360 // steps for a full turn of minute rotor

// ports used to control the stepper motor
// if your motor rotate to the opposite direction,
// change the order as {2, 3, 4, 5};
const byte port[] = {2, 3, 4, 6};
const uint32_t delaytime = 4; // wait for a single step of stepper
const int seq[4][4] = {
  { LOW,  LOW, HIGH,  LOW},
  { LOW,  LOW,  LOW, HIGH},
  {HIGH,  LOW,  LOW,  LOW},
  { LOW, HIGH,  LOW,  LOW}
};

const uint32_t uneMinute = 3; // devrait être 60 mais pour le test on met 3 secondes

DateTime tempsPrecedent;

void rotate(int step) {
  static int phase = 0;
  int i, j;
  int delta = (step > 0) ? 1 : 3;
  int dt = 20;

  step = (step > 0) ? step : -step;
  for (j = 0; j < step; j++) {
    phase = (phase + delta) % 4;
    for (i = 0; i < 4; i++) {
      digitalWrite(port[i], seq[phase][i]);
    }
    delay(dt);
    if (dt > delaytime) dt--;
  }
  // power cut
  for (i = 0; i < 4; i++)digitalWrite(port[i], LOW);
}

void setup() {
  Serial.begin (115200);

  for (byte i = 0; i < 4; i++) pinMode(port[i], OUTPUT);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (true) yield();
  }

#if USING_DS3231
  if (rtc.lostPower()) rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // DS3231
#else
  if (! rtc.isrunning())rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // DS1307
#endif
  tempsPrecedent = rtc.now();
}


void loop() {
  DateTime maintenant = rtc.now();
  TimeSpan deltaT = maintenant - tempsPrecedent;
  if (deltaT.totalseconds() >= uneMinute) {
    rotate(256);
    tempsPrecedent = rtc.now();
  }
  delay(1000);
}