#include <Arduino.h>

static const int LED_PIN = 2;
static const int BTN_PIN = 4;

// Estado do “modo” (muda a velocidade da tarefa do LED)
static bool fastMode = false;

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BTN_PIN, INPUT_PULLUP);
}

// “Task” A: LED periódico (200ms ou 80ms)
void led_timing(bool mode, unsigned long now) {
  static unsigned long lastLed = 0;
  unsigned long ledperiod = mode ? 100 : 500;

  if (now - lastLed >= ledPeriod){
    lastled = now;
    digitalWrite(LED_PIN,!digitalRead(LED_PIN));
  }
}

// “Task” B: log a cada 1000ms
void log_alive(unsigned long now) {
  static unsigned long lastLog = 0;

  if (now - lastLog >=1000)
  {
    lastLog =now;
    Serial.printf("[loop] modo =%s\n", fastMode ? "fastMode" : "NORMAL");
  }
}

// “Task” C: polling do botão (com debounce)
void button_press() {
  if (digitalRead(BTN_PIN) == LOW) {   // apertou
 	delay(50);
  if(digitalRead(BTN_PIN) == LOW){
    fastMode = !fastMode;
    Serial.printf("[btn] modo =%s\n]", fastMode ? "fastMode" : "NORMAL");
    while(!digitalRead(btn_pin)==LOW){}
  }
  delay(50);
    }
  }


void loop() {
  unsigned long now = millis();

  button_press();
  led_timing(fastMode, now);
  log_alive(now);
}