private void EnsureInitialized()
{
if (isInitialized) { return; }
// Validate
if (xChannel == null) { throw new MissingIoException(nameof(XChannel)); }
if (yChannel == null) { throw new MissingIoException(nameof(YChannel)); }
// Start with fake reading
currentReading = new ThumbstickReading(0, 0, false);
// Initialize button?
if (buttonPin != null)
{
if (buttonPin.IsDriveModeSupported(GpioPinDriveMode.InputPullUp))
{
buttonPin.SetDriveMode(GpioPinDriveMode.InputPullUp);
}
else
{
buttonPin.SetDriveMode(GpioPinDriveMode.Input);
}
buttonPin.DebounceTimeout = TimeSpan.FromMilliseconds(50);
}
isInitialized = true;
}
/// <summary>
/// Initializes a new <see cref="ThumbstickReadingChangedEventArgs"/>
/// </summary>
/// <param name="reading"></param>
public ThumbstickReadingChangedEventArgs(ThumbstickReading reading)
{
if (reading == null)
{
throw new ArgumentNullException("reading");
}
this.Reading = reading;
}
/// <summary>
/// Initializes a new <see cref="ThumbstickReadingChangedEventArgs"/>
/// </summary>
/// <param name="reading"></param>
public ThumbstickReadingChangedEventArgs(ThumbstickReading reading)
{
if (reading == null) throw new ArgumentNullException("reading");
this.Reading = reading;
}
private void Update()
{
// Read X and Y values
var x = xChannel.ReadRatio();
var y = yChannel.ReadRatio();
// Scale to -1 to 1, and Y needs to be inverted
x = (x * 2) - 1;
y = (-y * 2) + 1;
// Button
bool pressed = false;
if (buttonPin != null)
{
pressed = (buttonPin.Read() == GpioPinValue.Low);
}
// Update current value
lock(currentReading)
{
currentReading = new ThumbstickReading(x, y, pressed);
}
// Notify
readingChangedEvent.Raise(this, new ThumbstickReadingChangedEventArgs(currentReading));
}