nanoFramework.Iot.Device.Button

Button

The ButtonBase class is a base implementation for buttons that is hardware independent and can be used across devices. The GpioButton is a GPIO implementation of the button and inherits from the ButtonBase class. This implementation has been tested on an ESP32 platform, specifically on the M5StickC Plus.

Documentation

Documentation for the M5StickC Plus, including pin mapping, can be found here. Information regarding standard mouse events, used as inspiration for the button events, can be found here.

Usage

You can find an example in the samples directory.

// Initialize a new button with the corresponding button pin
GpioButton button = new GpioButton(buttonPin: 37);

Debug.WriteLine("Button is initialized, starting to read state");

// Enable or disable holding or doublepress events
button.IsDoublePressEnabled = true;
button.IsHoldingEnabled = true;

// Write to debug if the button is down
button.ButtonDown += (sender, e) =>
{
    Debug.WriteLine($"buttondown IsPressed={button.IsPressed}");
};

// Write to debug if the button is up
button.ButtonUp += (sender, e) =>
{
    Debug.WriteLine($"buttonup IsPressed={button.IsPressed}");
};

// Write to debug if the button is pressed
button.Press += (sender, e) =>
{
    Debug.WriteLine($"Press");
};

// Write to debug if the button is double pressed
button.DoublePress += (sender, e) =>
{
    Debug.WriteLine($"Double press");
};

// Write to debug if the button is held and released
button.Holding += (sender, e) =>
{
    switch (e.HoldingState)
    {
        case ButtonHoldingState.Started:
            Debug.WriteLine($"Holding Started");
            break;
        case ButtonHoldingState.Completed:
            Debug.WriteLine($"Holding Completed");
            break;
    }
};

Thread.Sleep(Timeout.Infinite);

Expected output

Button is initialized, starting to read state
buttondown IsPressed=True
buttonup IsPressed=False
Press
buttondown IsPressed=True
buttonup IsPressed=False
Press
Double press
buttondown IsPressed=True
Holding Started
buttonup IsPressed=False
Press
Holding Completed

Testing

The unit test project can be found in the tests directory. You can simply run them using the VS2019 built-in test capabilites: