private Task InitializeEventDetectionTask(CancellationToken token, SafeLineHandle pinHandle)
{
return(Task.Run(() =>
{
while (!(token.IsCancellationRequested || _disposing))
{
// WaitEventResult can be TimedOut, EventOccured or Error, in case of TimedOut will continue waiting
TimeSpec timeout = new TimeSpec
{
TvSec = new IntPtr(0),
TvNsec = new IntPtr(1000000)
};
WaitEventResult waitResult = Interop.libgpiod.gpiod_line_event_wait(pinHandle, ref timeout);
if (waitResult == WaitEventResult.Error)
{
throw ExceptionHelper.GetIOException(ExceptionResource.EventWaitError, Marshal.GetLastWin32Error(), _pinNumber);
}
if (waitResult == WaitEventResult.EventOccured)
{
GpioLineEvent eventResult = new GpioLineEvent();
int checkForEvent = Interop.libgpiod.gpiod_line_event_read(pinHandle, ref eventResult);
if (checkForEvent == -1)
{
throw ExceptionHelper.GetIOException(ExceptionResource.EventReadError, Marshal.GetLastWin32Error());
}
PinEventTypes eventType = (eventResult.event_type == 1) ? PinEventTypes.Rising : PinEventTypes.Falling;
this?.OnPinValueChanged(new PinValueChangedEventArgs(eventType, _pinNumber), eventType);
}
}
}, token));
}
private Task InitializeEventDetectionTask(CancellationToken token, SafeLineHandle pinHandle)
{
return(Task.Run(() =>
{
while (!(token.IsCancellationRequested || _disposing))
{
// WaitEventResult can be TimedOut, EventOccured or Error, in case of TimedOut will continue waiting
WaitEventResult waitResult = Interop.WaitForEventOnLine(pinHandle);
if (waitResult == WaitEventResult.Error)
{
throw ExceptionHelper.GetIOException(ExceptionResource.EventWaitError, Marshal.GetLastWin32Error(), _pinNumber);
}
if (waitResult == WaitEventResult.EventOccured)
{
int readResult = Interop.ReadEventForLine(pinHandle);
if (readResult == -1)
{
throw ExceptionHelper.GetIOException(ExceptionResource.EventReadError, Marshal.GetLastWin32Error());
}
PinEventTypes eventType = (readResult == 1) ? PinEventTypes.Rising : PinEventTypes.Falling;
this?.OnPinValueChanged(new PinValueChangedEventArgs(eventType, _pinNumber), eventType);
}
}
}, token));
}
