// GFS_button  3/5/25
// this is NOT beginner code
// written for Uno Rev 3, uses port register read and mask of board pin 7
// for https://forum.arduino.cc/t/simulator-which-one-is-better/1359552/10

const byte buttonPin = 7;  // PIND bit 7
byte  pin7history = 0xFF;

void setup()
{
  Serial.begin( 115200 );
  Serial.println( F( "\n\nButton\n " ));
  
  pinMode( buttonPin, INPUT_PULLUP );
}


void button()
{
  static byte  prevMillis = 0xFF;
  
  if ( prevMillis != (byte) millis())
  {
    pin7history = pin7history << 1;
    pin7history += (( PIND & 0x80 ) ? 1 : 0 );
    prevMillis = (byte) millis();
  }
}

void loop()
{
  button();

  switch ( pin7history )
  {
    case 0x7F :
    Serial.print( F( "button release " ));
    Serial.println( millis());
    pin7history = 0xFF;
    break;

    case 0x80 :
    Serial.print( F( "button press " ));
    Serial.println( millis());
    pin7history = 0;
    break;
  }
}