/// <summary>
/// Fetch an update from the Nunchuk and push it to all the properties.
/// </summary>
/// <returns>An awaitable task that completes upon success.</returns>
public async Task UpdateAsync()
{
// the nunchuk does not respond to standard SMBus-compliant register reads, so we have to write a register, then do a new transaction to read out the data
await dev.WriteByteAsync(0x00).ConfigureAwait(false);
var response = await dev.ReadDataAsync(6).ConfigureAwait(false);
joystick.X = response[0] / 127.5f - 1f; // normalize joystick data to [-1, 1]
joystick.Y = response[1] / 127.5f - 1f;
if (!oldJoystickData.SequenceEqual(response.Take(2)))
{
JoystickChanged?.Invoke(this, new JoystickEventArgs {
NewValue = joystick
});
}
Array.Copy(response, oldJoystickData, 2);
accelerometer.X = 2 * (short)((response[2] << 8) | (((response[5] >> 2) & 0x3) << 6)) /
(float)ushort.MaxValue; // normalize accelerometer data to [-1, 1]
accelerometer.Y = 2 * (short)((response[3] << 8) | (((response[5] >> 4) & 0x3) << 6)) /
(float)ushort.MaxValue;
accelerometer.Z = 2 * (short)((response[4] << 8) | (((response[5] >> 6) & 0x3) << 6)) /
(float)ushort.MaxValue;
((DigitalInPeripheralPin)Z.Input).DigitalValue = (response[5] & 0x01) == 0;
((DigitalInPeripheralPin)C.Input).DigitalValue = (response[5] & 0x02) == 0;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Joystick)));
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Accelerometer)));
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(C)));
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Z)));
}
/// <summary>
/// Pollt alle 50ms den Joystick und generiert ein JoystickChanged Event, falls
/// sich der Zustand des Joysticks (Taste gedrückt/losgelassen) verändert hat.
/// </summary>
private void Run()
{
Keys oldState = Keys;
while (true)
{
Keys newState = Keys;
if (!oldState.Equals(newState))
{
JoystickChanged.Invoke(this, new KeyEventArgs(newState));
oldState = newState;
}
Thread.Sleep(50);
}
}