 void loop() {
     buttons_test();
     M5.update();
-}+}

    return micros() - start;
}

// the setup routine runs once when M5Stack starts up
void setup() {
    // gpio test

#include <Arduino.h>
#include <M5Stack.h>
#include <stdlib.h>
//#include "FastLED.h"

#include "WiFi.h"
#include "utility/MPU9250.h"
