#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h> // https://github.com/adafruit/Adafruit-PCD8544-Nokia-5110-LCD-library/blob/master/

// Software SPI
// Adafruit_PCD8544 display = Adafruit_PCD8544(3, 4, 5, 7, 6); // CLK, DIN, DC, CS, RST

// Hardware SPI
// SCK 13
// DIN 11
Adafruit_PCD8544 display = Adafruit_PCD8544(5, 7, 6); // DC, CS, RST

// monochrome 16x16 bitmap editor
// https://www.espboards.dev/tools/monochrome-bitmap-tool/

static const unsigned char PROGMEM heart[] =
{ B00111100, B00111100,
  B01000010, B01000010,
  B10000001, B10000001,
  B10000000, B00000001,
  B10000000, B00000001,
  B10000000, B00000001,
  B10000000, B00000001,
  B01000000, B00000010,
  B01000000, B00000010,
  B00100000, B00000100,
  B00100000, B00000100,
  B00010000, B00001000,
  B00001000, B00010000,
  B00000100, B00100000,
  B00000010, B01000000,
  B00000001, B10000000,
};

void setup()   {
  Serial.begin(9600); // start serial comms
  display.begin(); // start display instance
  display.clearDisplay();   // clears display buffer
  display.display(); // show buffer

  display.clearDisplay(); // must start with clearDisplay() to "home" pixel cols/rows
  display.print("drawPixel()");
  display.drawPixel(20, 20, BLACK); // ONE pixel. "BLACK = 1 = ON"
  display.drawPixel(20, 20, BLACK); // ONE pixel. "BLACK = 1 = ON"
  display.display();
  delay(1000);

  display.clearDisplay();
  display.setTextSize(1); // smallest font size
  display.setTextColor(BLACK);
  display.setCursor(0, 0);
  for (int j = 0; j < 3; j++) {
    display.clearDisplay();
    for (int i = j * 84 ; i < 84 + j * 84; i++) { // 84 characters (14 cols x 6 rows)
      if (i == '\n') continue; // remove CR and LF
      display.write(i);
    }
    display.display();
    delay(2000);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(0, 0);
  display.println("Hello, world!");
  display.setTextColor(WHITE, BLACK); // 'inverted' text
  display.println("INVERSE");
  display.setTextSize(2);
  display.setTextColor(BLACK);
  display.print("0x");
  display.println(0xFEED, HEX);
  display.display();
  delay(2000);

  display.clearDisplay();
  display.setRotation(1);
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(0, 0);
  display.println("Rotation");
  display.display();
  display.setRotation(0); // reset rotation
  delay(2000);

  display.clearDisplay();
  display.setCursor(5, 5);
  display.setTextSize(2);
  display.print("PPM: ");
  display.drawBitmap(5, 25, heart, 16, 16, 1); // x, y, bitmap, sizeX, sizeY, color
  display.display();
}

void loop() {}