Proof Of Concept FastLED with M5Atom

M5atom-FastLED-grove-WS2813-PoC-police.ino

#include <M5StickC.h> // should work with any grove port really. i2c?
#include <FastLED.h> // https://github.com/FastLED/FastLED 
/* note, two led strips in use, one cell onboard and the rest on another strip. */

#define NUM_LEDS 20
#define DATA_PIN 32 // large strip
CRGB leds[NUM_LEDS+1];
CRGB dot[0];

uint8_t cell = 0;
uint8_t modes = 0;
bool enable_strip = true;

void wipeStrip();

void setup() {
  M5.begin();
  Serial.begin(115200);
  Serial.println("setup() Starting...");
  pinMode(39, INPUT_PULLUP); // aka button B. optional now?
  delay(2000); // fastled setup.
  FastLED.addLeds<SK6812, 27,       GRB>(leds, 0,1);          // GRB ordering is typical
  FastLED.addLeds<WS2813, DATA_PIN, GRB>(leds, 1,NUM_LEDS);
  FastLED.setBrightness(255);
  Serial.println("setup() done. Toggle with button B."); // M5Atom specific, search https://sensorstacks.com/?s=m5atom
}

void wipeStrip(int led_val) {
  // 0 == onboard led button
  for (cell = 1; cell <= NUM_LEDS; cell++) {
    leds[cell] = led_val;
  }
  FastLED.show();
  return;
}

void loop() {
  M5.update();
  
  if (M5.BtnB.wasPressed()) {
    enable_strip = !enable_strip;
  }
  
  if (enable_strip) {
    leds[0] = CRGB::Green;
  } else {
    leds[0] = CRGB::Red;
    wipeStrip(CRGB::Black);
    delay(25);
    return;
  }

  if (++modes >= 4) {
    modes = 0; // reset
  }

  if (modes == 0) {
    wipeStrip(CRGB::Black);
  } else if (modes == 1) { 
    wipeStrip(CRGB::Red);
  } else if (modes == 2) {
    wipeStrip(CRGB::Black);
  } else if (modes == 3) { 
    wipeStrip(CRGB::Blue);
  }

  FastLED.show();
  delay(100);
}