SchedulerDebounce.ino

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#include <Scheduler.h>

// Check for SparkFun SAMD21 Breakout
#if defined(ARDUINO_ARCH_SAMD) && (USB_PID == 0x8D21)
#define Serial SerialUSB
#endif

unsigned int count = 0;

void setup()
{
  Serial.begin(57600);
  while (!Serial);
  Serial.println(F("SchedulerDebounce: started"));
  Scheduler.start(debounceSetup, debounceLoop);
}

void loop()
{
  Serial.print(millis());
  Serial.print(F(":loop::count="));
  Serial.println(count);
  delay(1000);
}

const int BUTTON = 4;
volatile int state;

void debounceSetup()
{
  pinMode(BUTTON, INPUT_PULLUP);
}

void debounceLoop()
{
  const unsigned int DEBOUNCE = 50;
  state = digitalRead(BUTTON);
  while (1) {
    await(digitalRead(BUTTON) != state);
    state = !state;
    if (state)
      buttonUp();
    else
      buttonDown();
    delay(DEBOUNCE);
  }
}

void buttonDown()
{
  Serial.print(millis());
  Serial.println(F(":buttonDown"));
  count += 1;
}

void buttonUp()
{
  Serial.print(millis());
  Serial.println(F(":buttonUp"));
}