M5Stack Atom Matrix LED example (without M5Atom library that causes flicker)

M5Stack_Atom_LED_Example.cpp

#include <FastLED.h>

const int NUM_LEDS = 25;
const int LED_PIN = 27;
static CRGB leds[NUM_LEDS];

CRGB correct(CRGB c) {
  // fix RGB order :(
  return CRGB(c.g, c.r, c.b);
}

void initDisplay() {
  FastLED.addLeds<WS2812, LED_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(20);
}

void setPixelAndShow(index i, CRGB c) {
  leds[i] = correct(c);
  FastLED.show();
}