pollMultiple static method

PollMultipleEvent pollMultiple(List<GPIO> gpios, int timeoutMillis)

Polls multiple GPIOs for an edge event configured with GPIO.setGPIOedge. For character device GPIOs, the edge event should be consumed with GPIO.readEvent. For sysfs GPIOs, the edge event should be consumed with GPIO.read. timeoutMillis can be positive for a timeout in milliseconds, zero for a non-blocking poll, or negative for a blocking poll. Returns a PollMultipleEvent()

Implementation

static PollMultipleEvent pollMultiple(List<GPIO> gpios, int timeoutMillis) {
  final ptr = malloc<Pointer<Void>>(gpios.length);
  final result = malloc<Int8>(gpios.length);
  try {
    var index = 0;
    for (var g in gpios) {
      g._checkStatus();
      ptr[index++] = g._gpioHandle;
    }
    _checkError(
        _nativeGPIOmultiplePoll(ptr, gpios.length, timeoutMillis, result));

    var list = List<bool>.filled(gpios.length, false);
    var counter = 0;
    for (var i = 0; i < gpios.length; ++i) {
      list[i] = result[i] == 1 ? true : false;
      if (list[i]) {
        ++counter;
      }
    }
    return PollMultipleEvent(gpios, counter, list);
  } finally {
    malloc.free(ptr);
    malloc.free(result);
  }
}