// https://10print.org/10_PRINT_121114.pdf

#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET     4
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int x, y, maxRowOlws = 12, maxColOled = 24, crlf, maxColSerial = 80;
int charLeft = 47, charRight = 92, charHeight = 5, charWidth = 5;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(A0));
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.display();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  // ascii();
}

void loop() {
  oled10PRINT();
  // serial10PRINT();
}

void oled10PRINT() {
  display.setCursor(x * charWidth, y * charHeight);
  display.write(random(2) ? charLeft : charRight);
  display.display();

  x++;
  if (x > maxColOled) {
    x = 0;
    y++;
    if (y == maxRowOlws) {
      y = 0;
      display.clearDisplay();
      display.display();
      display.setCursor(0, 0);
    }
  }
}

void serial10PRINT() {
  Serial.write(random(2) ? charLeft : charRight);
  if (++x > maxColSerial) {
    x = 0;
    Serial.println();
  }
}

void ascii() {
  for (int j = 0; j < 8; j++) {
    for (int i = 0; i < 20; i++) {
      display.setCursor(i * 6, j * 8);
      display.write(j * 20 + i);
      display.display();
    }
  }
}