Atomic Display Base Arduino Tutorial

#include <Arduino.h>
#include <M5AtomDisplay.h>
#include <M5Unified.h>
 
void setup() {
  auto cfg = M5.config();
 
  // external display setting. (Pre-include required)
  cfg.external_display.atom_display = true;  // default=true. use AtomDisplay
 
  // Set individual parameters for external displays.
  // (※ Use only the items you wish to change. Basically, it can be omitted.)
  cfg.atom_display.logical_width = 1920;
  cfg.atom_display.logical_height = 1200;
  // cfg.atom_display.output_width   = 1920;
  // cfg.atom_display.output_height  = 1080;
  // cfg.atom_display.refresh_rate   = 60;
  // cfg.atom_display.scale_w        = 2;
  // cfg.atom_display.scale_h        = 2;
  // cfg.atom_display.pixel_clock    = 74250000;
 
  // begin M5Unified.
  M5.begin(cfg);
 
  // Get the number of available displays
  int display_count = M5.getDisplayCount();
 
  for (int i = 0; i < display_count; ++i) {
    // All displays are available in M5.Displays.
    // ※ Note that the order of which displays are numbered is the order in which they are detected, so the order may change.
 
    M5.Displays(i).clear();
    int textsize = M5.Displays(i).height() / 120;
    if (textsize < 5) { textsize = 3; }
    M5.Displays(i).setTextSize(textsize);
    M5.Displays(i).printf("\n\nNo.%d\n\n", i);
  }
 
  // If an external display is to be used as the main display, it can be listed in order of priority.
  M5.setPrimaryDisplayType({
    m5::board_t::board_M5AtomDisplay,
    // m5::board_t::board_M5ModuleDisplay,
  });
 
  // The primary display can be used with M5.Display.
  M5.Display.print("primary display\n\n");
 
  // Examine the indexes of a given type of display
  int index_atom_display = M5.getDisplayIndex(m5::board_t::board_M5AtomDisplay);
 
  if (index_atom_display >= 0) {
    M5.Displays(index_atom_display).print("This is Atom Display\n");
  }
 
  M5.delay(2500);
}
 
void loop() {
  M5.delay(100);
 
  int x = rand() % M5.Displays(0).width();
  int y = rand() % M5.Displays(0).height();
  int r = (M5.Displays(0).width() >> 2) + 2;
  uint16_t c = rand();
  M5.Displays(0).fillCircle(x, y, r, c);
 
  draw_function(&M5.Displays(1));
}
 
// When creating a function for drawing, it can be used universally by accepting a LovyanGFX type as an argument.
void draw_function(LovyanGFX* gfx) {
  int x = rand() % gfx->width();
  int y = rand() % gfx->height();
  int r = (gfx->width() >> 6) + 2;
  uint16_t c = rand();
  gfx->fillRect(x - r, y - r, r * 2, r * 2, c);
}