From 617aab43d7ee92e384842a6fedb0c5f12ce0256b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Franti=C5=A1ek=20Boh=C3=A1=C4=8Dek?=
 <fandabohacek@gmail.com>
Date: Fri, 28 Jul 2023 21:23:55 +0200
Subject: [PATCH] feat(src): add CountDown abstraction

---
 src/count_down.rs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/count_down.rs

diff --git a/src/count_down.rs b/src/count_down.rs
new file mode 100644
index 0000000..e858ca0
--- /dev/null
+++ b/src/count_down.rs
@@ -0,0 +1,38 @@
+use fugit::MicrosDurationU32;
+use nb::Result;
+use stm32f1xx_hal::timer::{self, CounterUs, Instance};
+
+pub trait CountDown {
+    type Time;
+
+    fn start(&mut self, count: Self::Time);
+    fn wait(&mut self) -> Result<(), timer::Error>;
+}
+
+pub struct CountDowner<T> {
+    counter: CounterUs<T>,
+}
+
+impl<T> CountDowner<T>
+where
+    T: Instance,
+{
+    pub fn new(counter: CounterUs<T>) -> Self {
+        Self { counter }
+    }
+}
+
+impl<T> CountDown for CountDowner<T>
+where
+    T: Instance,
+{
+    type Time = MicrosDurationU32;
+
+    fn start(&mut self, count: Self::Time) {
+        self.counter.start(count.into()).unwrap();
+    }
+
+    fn wait(&mut self) -> nb::Result<(), timer::Error> {
+        self.counter.wait()
+    }
+}
-- 
2.48.1