application.cpp

/*
  INPUT_PULLUP doesn't seem to work when using the pin as an interrupt and 
  also use it to go out of sleep mode.
  
  The pin floats when not attached to ground. That shouldn't happen because of the 
  internal pull-up. However the sleeping part works well from both states of the button (LOW or "floating"). 
*/

#include "application.h"

#pragma SPARK_NO_PREPROCESSOR
SYSTEM_THREAD(ENABLED);
SYSTEM_MODE(MANUAL);

void buttonPress();

bool WkpValue;

void setup()
{ WiFi.off();
  Serial.begin(57600);
  
  pinMode(WKP, INPUT_PULLUP);
  attachInterrupt(WKP, buttonPress, CHANGE);
  
  System.sleep(WKP, CHANGE); 
}

void buttonPress() {
  WkpValue = digitalRead(WKP);
  Serial.print("p: ");
  Serial.println(WkpValue);
}

void loop()
{ Serial.println("Awake");
  delay(500);
}