Use of WKUP input after Power.Shutdown

TinyCLR OS
9

Yes, im trying to use PA0 as an ON/OFF button. Once the code runs PA0 should run Shutdown and once its shutdown it should by design Wakeup (restart).

This works with LDR button but not when i use PA0.
Btw i don’t have any more interrupts available. All 16 are used as buttons.

This is not a big issue atm, i can just shutdown every 5 minutes of inactivity (not pressing any of the buttons) and PA0 will then work as expected.
But i need to know if the button will be labeled ON/OFF on the membrane keyboard or just ON.

class Program
    {
        static GpioController gpio;
        static GpioPin led;
        static GpioPin ldr;
        static Thread wkupThread;
        static void Main()
        {
            gpio = GpioController.GetDefault();

            led = gpio.OpenPin(SC20100.GpioPin.PA6);
            led.SetDriveMode(GpioPinDriveMode.Output);

            ldr = gpio.OpenPin(SC20100.GpioPin.PE3);
            ldr.SetDriveMode(GpioPinDriveMode.InputPullUp);

            wkupThread = new Thread(PollWkup);
            wkupThread.Start();

            while (true)
            {
                for (int i = 0; i < 10; i++)
                {
                    led.Write(GpioPinValue.High);
                    Thread.Sleep(500);
                    led.Write(GpioPinValue.Low);
                    Thread.Sleep(500);
                }
            }
        }

        static void PollWkup()
        {
            while (true)
            {
                Debug.WriteLine("poll wkup");
                if (ldr.Read() == GpioPinValue.Low)
                {
                    Debug.WriteLine("ldr low");
                    Power.Shutdown(true, DateTime.MaxValue);
                }
                else {
                    Debug.WriteLine("ldr high");
                }
                Thread.Sleep(100);
            }
        }
    }