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M5Stack Atom Matrix LED example (without M5Atom library that causes flicker)
#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);
void setPixelAndShow(index i, CRGB c) {
leds[i] = correct(c);;
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