/// <summary>
/// Start polling for pin events
/// </summary>
/// <param name="cancellationToken"></param>
public unsafe void StartMonitoring(int pollInterval = 500, CancellationToken cancellationToken = default)
{
if (_reqFd < 0)
{
throw new IOException("Pin is not configured");
}
_ = Task.Run(() =>
{
gpioevent_data eventData = new gpioevent_data();
int sizeOfEventData = Marshal.SizeOf(typeof(gpioevent_data));
do
{
if (Interop.read(_reqFd, new IntPtr(&eventData), sizeOfEventData) == sizeOfEventData)
{
Value = (eventData.id == (uint)GpioEvent.GPIOEVENT_EVENT_RISING_EDGE);
PinChanged?.Invoke(this, Value);
}
else
{
// FIXME: Handle exception here
Console.WriteLine("Oh snap! Read returned invalid size");
break;
}
} while (!cancellationToken.IsCancellationRequested);
}, cancellationToken);
}
/// <summary>
/// Start polling for pin events
/// </summary>
/// <param name="cancellationToken">Optional cancellation token</param>
/// <returns>Asynchronous task</returns>
public unsafe Task StartMonitoring(CancellationToken cancellationToken = default)
{
if (_reqFd < 0)
{
throw new IOException("Pin is not configured");
}
return(Task.Run(() =>
{
gpioevent_data eventData = new gpioevent_data();
int sizeOfEventData = Marshal.SizeOf(typeof(gpioevent_data));
do
{
if (Interop.read(_reqFd, new IntPtr(&eventData), sizeOfEventData) == sizeOfEventData)
{
Value = (eventData.id == (uint)GpioEvent.GPIOEVENT_EVENT_RISING_EDGE);
PinChanged?.Invoke(this, Value);
}
else
{
throw new IOException("Read returned invalid size");
}
}while (!cancellationToken.IsCancellationRequested);
}));
}
public override void OnGPIO(int number, bool value)
{
base.OnGPIO(number, value);
if (CheckPinNumber(number))
{
PinChanged?.Invoke(Pins[number], value);
}
}
private async Task ClearPin(HttpListenerContext context, IPin pin)
{
bool currentState = false;
pin.Write(currentState ? PinValue.High : PinValue.Low);
await RespondPinValue(context, pin.PinNumber, currentState);
PinChanged?.Invoke(this, new PinEventArgs(context.Request, pin));
}
private async Task UpdatePin(HttpListenerContext context, IPin pin)
{
var request = context.Request;
var inputStream = request.InputStream;
var currentState = pin.Read() == PinValue.High;
using (var streamReader = new StreamReader(inputStream))
{
var content = await streamReader.ReadToEndAsync();
var obj = JObject.Parse(content);
JToken token = null;
if (obj.TryGetValue("state", out token))
{
switch (token.Type)
{
case JTokenType.Boolean:
currentState = token.Value <bool>();
break;
case JTokenType.String:
var str = token.Value <string>();
if (str == "toggle")
{
currentState = !currentState;
}
break;
}
}
}
pin.Write(currentState ? PinValue.High : PinValue.Low);
await RespondPinValue(context, pin.PinNumber, currentState);
PinChanged?.Invoke(this, new PinEventArgs(request, pin));
}
void OnPinChanged(int port, bool value)
{
PinChanged?.Invoke(this, new RelayChangedEventArgs(port, value));
}
private void btnPin_Click(object sender, EventArgs e)
{
SetPinned(!Pinned);
PinChanged?.Invoke(this, EventArgs.Empty);
}