// http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html
private static IDisposable InternalSetupPolled(int pin, InterruptModeEnum mode, Action handler)
{
Unmanaged.Interrupts.InterruptServiceRoutine(pin, (int)mode, null);
var thread = new Thread(o =>
{
var token = (CancellationToken)o;
while (!token.IsCancellationRequested)
{
var result = Unmanaged.Interrupts.WaitForInterrupt(pin, 500);
switch (result)
{
case -1:
var error = Marshal.GetLastWin32Error();
if (error == 4) // EINTR
{
continue;
}
throw new Exception($"Error #{error} occured while waiting for interrupt.");
case -2:
throw new Exception("Pin descriptor not initialized.");
case 0:
break;
case 1:
handler();
break;
default:
throw new Exception($"Unrecognized result value '{result}' received from WaitForInterrupt .");
}
}
});
return(new ThreadStopper(thread));
}
public static IDisposable SetupPolled(BroadcomPinNumberEnum pin, InterruptModeEnum mode, Action handler) => InternalSetupPolled((int)pin, mode, handler);
private static void InternalSetup(int pin, InterruptModeEnum mode, Action handler)
{
var callback = handler != null ? new InterruptCallback(handler) : null;
Unmanaged.Interrupts.InterruptServiceRoutine(pin, (int)mode, callback);
}
public static void Setup(BroadcomPinNumberEnum pin, InterruptModeEnum mode, Action handler) => InternalSetup((int)pin, mode, handler);