esp-clock/include/display.h

#pragma once

#include <Adafruit_LEDBackpack.h>   // Support for the Backpack FeatherWing
#include <Adafruit_GFX.h>           // Adafruit's graphics library
#include <Adafruit_I2CDevice.h>
#include <SPI.h>
#include "ntp_time.h"
#include "bme.h"

#define DISPLAY_ADDRESS 0x70
#define BRIGHTNESS_MIN 0
#define BRIGHTNESS_MAX 15
#define BRIGHTNESS_STEP 1
#define BRIGHTNESS_NIGHT BRIGHTNESS_MIN
#define BRIGHTNESS_DAY 11
#define SECONDS(value) value*1000

namespace Display {

  void displayTime();
  void displayTemp();
  void displayHumidity();
  void drawTime();
  void drawColon(bool);
  Task tDisplayTime(500, TASK_FOREVER, displayTime, &ts, false, []() {
    drawTime();
    return true;
  }, []() {
    drawColon(false);
  });
  Task tDisplaySensor(5*TASK_SECOND, 4, displayTemp, &ts, false, []() {
    tDisplayTime.disable();
    return true;
  }, []() {
    tDisplayTime.enableDelayed(tDisplaySensor.getInterval());
  });

  bool hourFormat24 = false;
  void (*hourFormatChangedCallback)();
  void onHourFormatChanged(void (*f)()) {
    hourFormatChangedCallback = f;
  }

  // Create display object
  Adafruit_7segment clockDisplay = Adafruit_7segment();

  namespace Brightness {
    uint8_t current = BRIGHTNESS_NIGHT;
    void (*brightnessChangedCallback)();

    void set(uint8_t value) {
      current = value % (BRIGHTNESS_MAX + 1);
      clockDisplay.setBrightness(current);
      brightnessChangedCallback();
    }

    void onChanged(void (*f)()) {
      brightnessChangedCallback = f;
    }

    void change(bool increase) {
      increase ? set(current + BRIGHTNESS_STEP) : set(current - BRIGHTNESS_STEP);
    }
  }

  void drawTime() {
    int displayHour = hourFormat24 ? hour() : hourFormat12();
    int displayMinute = minute();
    int displayValue = displayHour * 100 + displayMinute;

    // Print the time on the display
    clockDisplay.print(displayValue, DEC);

    // Add zero padding when in 24 hour mode and it's midnight.
    // In this case the print function above won't have leading 0's
    // which can look confusing.  Go in and explicitly add these zeros.
    if (displayHour == 0) {
      clockDisplay.writeDigitNum(1, 0);
      if (displayMinute < 10) {
        clockDisplay.writeDigitNum(3, 0);
      }
    }
  }

  void drawColon(bool colonOn) {
    if (colonOn) {
      static int currentHour = -1;
      if (currentHour != hour()) {
        currentHour = hour();
        if (currentHour == 8) {
          Brightness::set(BRIGHTNESS_DAY);
          Wifi::reconnect();
        }
        if (currentHour == 17) {
          Brightness::set(BRIGHTNESS_NIGHT);
        }
      }
      static int currentMin = -1;
      if (currentMin != minute()) {
        currentMin = minute();
        drawTime();
      }
    }
    clockDisplay.drawColon(colonOn);
  }

  void displayTime() {
    static bool colonOn = true;

    drawColon(colonOn);
    clockDisplay.writeDisplay();

    colonOn = !colonOn;
  }

  void displayTemp() {
    clockDisplay.printFloat(Bme::data.temp, 1);
    clockDisplay.writeDisplay();
    tDisplaySensor.setCallback(&displayHumidity);
  }

  void displayHumidity() {
    clockDisplay.printFloat(Bme::data.humidity, 1);
    clockDisplay.writeDisplay();
    tDisplaySensor.setCallback(&displayTemp);
  }

  void displayValue(uint8_t value) {
    tDisplayTime.disable();
    clockDisplay.print(value, HEX);
    clockDisplay.writeDisplay();
    tDisplayTime.enableDelayed(SECONDS(2));
  }

  void displayText(const char c[]) {
    tDisplayTime.disable();
    clockDisplay.println(c);
    clockDisplay.writeDisplay();
    tDisplayTime.enableDelayed(SECONDS(2));
  }

  void changeHourFormat24(bool format24) {
    hourFormat24 = format24;
    drawTime();
    hourFormatChangedCallback();
  }

  void setup() {
    clockDisplay.begin(DISPLAY_ADDRESS);
    clockDisplay.setBrightness(Brightness::current);
  }
}