Improve button press logic

arduino/src/buttons.rs

@@ -12,7 +12,7 @@ pub const BUTTON_COUNT: usize = 8;
 pub struct Button {
     pub index: usize,
     pub pin: Pin<Input<PullUp>, Dynamic>,
-    pub is_low: bool,
+    pub was_low: bool,
     // pub last_debounce_time: u64,
 }
 
@@ -20,8 +20,8 @@ impl Button {
     pub fn new(index: usize, pin: Pin<Input<PullUp>, Dynamic>) -> Self {
         Button {
             index,
+            was_low: pin.is_low(),
             pin,
-            is_low: true,
             // last_debounce_time: 0,
         }
     }
@@ -30,14 +30,13 @@ impl Button {
     where
         F: FnMut(usize, bool),
     {
-        match (self.pin.is_high(), self.is_low) {
-            (true, true) | (false, false) => {
-                self.is_low = !self.is_low;
+        // check if current state is different from previous one
+        if self.pin.is_high() == self.was_low {
+            // change state
+            self.was_low = !self.was_low;
 
-                f(self.index, !self.is_low);
-            }
-
-            _ => (),
+            //
+            f(self.index, !self.was_low);
         }
     }
 }

arduino/src/main.rs

@@ -55,7 +55,7 @@ fn main() -> ! {
     loop {
         for button in buttons.iter_mut() {
             button.check_state(|index, pressed| {
-                if !pressed {
+                if pressed {
                     ufmt::uwriteln!(&mut serial, "{}{}{}", MESSAGE_START, index, MESSAGE_END)
                         .unwrap();
                 }