Is it possible to open a pin with PinMode.Input and PinMode.Output?

I’m trying to write 1/0 to pin and listening all changes.

my code:

using System.Device.Gpio;
using System.Device.Gpio.Drivers;

var _gpioController = new GpioController(
    numberingScheme: PinNumberingScheme.Logical,
    driver: new SysFsDriver());

var relayPin = 128 + 21;
var highTime = 1000;
var lowTime = 200;

System.Console.WriteLine("start openning");

_gpioController.OpenPin(
    relayPin,
    PinMode.Input );

System.Console.WriteLine("opened");

System.Console.WriteLine("registering handlers");

_gpioController.RegisterCallbackForPinValueChangedEvent(
    pinNumber: relayPin,
    eventTypes: PinEventTypes.Rising,
    callback: (_, args) =>
    {
        Console.WriteLine($"{args.PinNumber} is rising");
    });

System.Console.WriteLine("try to set new pin mode");

_gpioController.SetPinMode(
    pinNumber: relayPin,
    mode: PinMode.Output);

System.Console.WriteLine("start relay test");

while (true)
{
    _gpioController.Write(relayPin, PinValue.High);
    Thread.Sleep(highTime);

    _gpioController.Write(relayPin, PinValue.Low);
    Thread.Sleep(lowTime);
}

Unfortunately only _gpioController.Write.. works. Is it possible to listen and to write?

[INTERNALINTERFERENCE]

thanks for help! I appreciate this

[joperezr]

@INTERNALINTERFERENCE the main issue with your code is that, as @raffaeler explained, you can’t really have a pin operating both as input and output. The easiest way to do a hello world program that tests for detecting events uses two pins instead of just one. You connect them via a wire physically, and set one as input (and configure the callback exactly like you do in your code) and then you set the other pin as output. Then you write to the output pin 0s and 1s, and your callback should get fired every time that you write a 1 to the output pin after writing a 0.