#include <DS3231.h>
#include <ESP8266WiFi.h>
#include <TM1637Display.h>
#include <Wire.h>

#define CLK 16
#define DIO 12

// The amount of time (in milliseconds) between tests
#define TEST_DELAY 1000

const byte HourBtn = 13;
const byte MinBtn = 2;
volatile byte state = 0;
byte displaySec = 0b01000000;
TM1637Display display(CLK, DIO);
DS3231 myRTC;

uint8_t data[] = {0xff, 0xff, 0xff, 0xff};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  display.setBrightness(0x0f);
  display.setSegments(data);
  Wire.begin();

  pinMode(HourBtn, INPUT_PULLUP);
  pinMode(MinBtn, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(HourBtn), pushHour, RISING);
  attachInterrupt(digitalPinToInterrupt(MinBtn), pushMin, RISING);
  delay(500);
}

void loop() {
  bool h12, pm;
  byte hour = myRTC.getHour(h12, pm);
  byte min = myRTC.getMinute();

  switch (state) {
  case 1:
    hour = (hour + 1) % 24;
    myRTC.setHour(hour);
    state = 0;
    break;
  case 2:
    min = (min + 1) % 60;
    myRTC.setMinute(min);
    state = 0;
    break;
  }

  Serial.print(hour, DEC);
  Serial.print(':');
  Serial.println(min, DEC);
  Serial.print("DisplaySec ");
  Serial.print(displaySec);
  Serial.print(", ");
  Serial.println(displaySec & 0b01000000);

  int time = hour * 100 + min;
  display.showNumberDecEx(time, displaySec & 0b01000000, true);
  delay(TEST_DELAY);
  displaySec = ~displaySec;
}

IRAM_ATTR void pushHour() { state = 1; }
IRAM_ATTR void pushMin() { state = 2; }