/*wait for start button to be clicked*/

/*
void wait_start()
{
  while(!start_button()){}
  while(start_button()){}
}
*/
void wait_start()
{
  while(!start_trigger()){}
  while(start_trigger()){}
}

/*wait for stop button to be clicked*/
/*
void wait_stop()
{
  while(!stop_button()){}
  while(stop_button()){}
}
*/
void wait_stop()
{
  while(!stop_trigger()){}
  while(stop_trigger()){}
}

/*wait for a digital port to be triggered and untriggered*/
void wait_port(int port)
{
  while(!digital(port)){}
  while(digital(port)){}
}

int start_trigger()
{
  return start_button() || digital(START_BUTTON) ;
}
int stop_trigger()
{
  return stop_button() || digital(STOP_BUTTON) ;
}