simple key debounce

src/main.rs

@@ -1,21 +1,53 @@
 #![no_std]
 #![no_main]
 
+use defmt::info;
 use embassy_executor::Spawner;
-use embassy_rp::gpio::{Level, Output};
+use embassy_rp::gpio::{Input, Level, Output, Pull};
 use embassy_time::{Duration, Timer};
 use {defmt_rtt as _, panic_probe as _};
 
+pub struct Debouncer<'a> {
+    input: Input<'a>,
+    debounce: Duration,
+}
+
+impl<'a> Debouncer<'a> {
+    pub fn new(input: Input<'a>, debounce: Duration) -> Self {
+        Self { input, debounce }
+    }
+
+    pub async fn debounce(&mut self) -> Level {
+        loop {
+            let l1 = self.input.get_level();
+
+            self.input.wait_for_any_edge().await;
+
+            Timer::after(self.debounce).await;
+
+            let l2 = self.input.get_level();
+            if l1 != l2 {
+                break l2;
+            }
+        }
+    }
+}
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) -> ! {
     let p = embassy_rp::init(Default::default());
     let mut led = Output::new(p.PIN_25, Level::Low);
+    let mut switch_input = Debouncer::new(Input::new(p.PIN_0, Pull::Up), Duration::from_millis(20));
+    switch_input.input.set_schmitt(true);
     loop {
-        defmt::info!("led on");
-        led.set_high();
-        Timer::after(Duration::from_millis(300)).await;
-        defmt::info!("led off");
+        defmt::info!("switch off");
         led.set_low();
-        Timer::after(Duration::from_millis(300)).await;
+
+        switch_input.debounce().await;
+
+        info!("switch on");
+        led.set_high();
+
+        switch_input.debounce().await;
     }
 }