default.nix: update cargoSha256

default.nix

@@ -49,7 +49,7 @@ let
     name = "${crate}";
     src = ./.;
     crateSubdir = crate;
-    cargoSha256 = "1fvild4mygcvnfcnmni4icg5nj16dj7hkzjpahzhpbyv9rr24722";
+    cargoSha256 = "02k72zj6qfbw9y69w3r9a1b1dg9pvkc7cl511hcv4w9rbnn3jlld";
     cargoFeatures = features;
     doCheck = false;
   };

libasync/src/delay.rs

@@ -0,0 +1,7 @@
+use embedded_hal::timer::CountDown;
+use crate::block_async;
+
+pub async fn delay<T: CountDown<Time=C>, C>(timer: &mut T, count: C) {
+    timer.start(count);
+    let _ = block_async!(timer.wait()).await;
+}