Adding User - Input

This section focuses on getting the buttons to work, so you can interact with the hardware!

An example of this implementation can be found here: 5_led_with_buttons.rs.

The buttons on the board are numbered pins, just like the on-board LED's. Their pins are p0.11, p0.12, p0.24 and p0.25.

✅ Bring the gpio module with p0 parts into scope and add a line to fn main() that gives you access to the p0 pins.

✅ Build a type and a static method for the buttons. This static method will take pins of any configuration and turn them into a pull-up input.

#![allow(unused)]
fn main() {
pub struct Button(Pin<Input<PullUp>>);

impl Button {
    fn new<Mode>(pin: Pin<Mode>) -> Self {
        Button(pin.into_pullup_input())
    }
}
}

✅ Create an instance of a button:

#![allow(unused)]
fn main() {
let button_1 = Button::new(pins.p0_11.degrade());
}

In order to have an effect, we first need to know the status of the button. Is the button pushed or not? Next, we have to connect an event with the button state.

✅ Inside the impl Button block, implement an instance method that returns true if the button is pressed:

#![allow(unused)]
fn main() {
pub fn is_pressed(&self) -> bool {
    self.0.is_low().unwrap()
}
}

Note, that struct Button does not have any named fields. To access the associated type, index with 0.

✅ Inside fn main(), implement one of the onboard LEDs.

✅ Continue to write the program, so that the LED is on, when the button is pushed and off, when the button is not pushed.