highLowFloating()

bool fl::ButtonLowLevel::highLowFloating

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Definition at line 22 of file button.cpp.

                                     {
    // FastLED doesn't have reliable support for pullups/pulldowns.
    // So we instead use a strategy where the pin is set to high, then
    // checked if it's high, then set to low, and then checked if it's low
    // if this is the case, then the pin is floating and thefore the button is
    // not being pressed.
    mPin.setPinMode(DigitalPin::kOutput);
    mPin.write(true); // set pin to high
    mPin.setPinMode(DigitalPin::kInput);
    const bool was_high = mPin.high(); // check if pin is high
    mPin.setPinMode(DigitalPin::kOutput);
    mPin.write(false); // set pin to low
    mPin.setPinMode(DigitalPin::kInput);
    const bool was_low = !mPin.high(); // check if pin is low
    const bool floating =
        was_high && was_low; // if both are true, then the pin is floating
    const bool pressed =
        !floating; // if the pin is floating, then the button is not pressed
    return pressed;
}

References fl::DigitalPin::kInput, fl::DigitalPin::kOutput, and mPin.

Referenced by isPressed().

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