/// <summary>
/// Registers the interrupt callback on the pin. Pin mode has to be set to Input.
///
/// </summary>
/// <param name="edgeDetection">The edge detection.</param>
/// <param name="callback">The callback.</param>
/// <exception cref="System.ArgumentException">callback</exception>
/// <exception cref="System.InvalidOperationException">
/// An interrupt callback was already registered.
/// or
/// RegisterInterruptCallback
/// </exception>
/// <exception cref="System.InvalidProgramException"></exception>
public void RegisterInterruptCallback(EdgeDetection edgeDetection, InterrputServiceRoutineCallback callback)
{
if (callback == null)
{
throw new ArgumentException($"{nameof(callback)} cannot be null");
}
if (InterruptCallback != null)
{
throw new InvalidOperationException("An interrupt callback was already registered.");
}
if (PinMode != GpioPinDriveMode.Input)
{
throw new InvalidOperationException($"Unable to {nameof(RegisterInterruptCallback)} for pin {PinNumber} because operating mode is {PinMode}."
+ $" Calling {nameof(RegisterInterruptCallback)} is only allowed if {nameof(PinMode)} is set to {GpioPinDriveMode.Input}");
}
lock (_syncLock)
{
var registerResult = WiringPi.wiringPiISR(PinNumber, (int)edgeDetection, callback);
if (registerResult == 0)
{
InterruptEdgeDetection = edgeDetection;
InterruptCallback = callback;
}
else
{
HardwareException.Throw(nameof(GpioPin), nameof(RegisterInterruptCallback));
}
}
}
public static extern int wiringPiISR(int pin, int mode, InterrputServiceRoutineCallback method);
