From 4cab71b5bac6bb8d41b9b9558cd6bfd930dd5e4d Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Wed, 24 Jan 2024 19:50:56 +0100
Subject: [PATCH 1/4] Add async `Delay` implementation for `tokio`.

---
 Cargo.toml   |  4 +++-
 src/delay.rs | 13 ++++++++++---
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index ea35bed..590aa91 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ edition = "2018"
 [features]
 gpio_sysfs = ["sysfs_gpio"]
 gpio_cdev = ["gpio-cdev"]
-async-tokio = ["gpio-cdev/async-tokio"]
+async-tokio = ["gpio-cdev/async-tokio", "dep:embedded-hal-async", "tokio/time"]
 i2c = ["i2cdev"]
 spi = ["spidev"]
 
@@ -24,6 +24,7 @@ default = [ "gpio_cdev", "gpio_sysfs", "i2c", "spi" ]
 [dependencies]
 embedded-hal = "1"
 embedded-hal-nb = "1"
+embedded-hal-async = { version = "1", optional = true }
 gpio-cdev = { version = "0.6.0", optional = true }
 sysfs_gpio = { version = "0.6.1", optional = true }
 i2cdev = { version = "0.6.0", optional = true }
@@ -31,6 +32,7 @@ nb = "1"
 serialport = { version = "4.2.0", default-features = false }
 spidev = { version = "0.6.0", optional = true }
 nix = "0.27.1"
+tokio = { version = "1", default-features = false, optional = true }
 
 [dev-dependencies]
 openpty = "0.2.0"
diff --git a/src/delay.rs b/src/delay.rs
index ffd435a..7dac367 100644
--- a/src/delay.rs
+++ b/src/delay.rs
@@ -2,16 +2,23 @@
 //!
 //! [`embedded-hal`]: https://docs.rs/embedded-hal
 
-use cast::u64;
 use embedded_hal::delay::DelayNs;
 use std::thread;
 use std::time::Duration;
 
-/// Empty struct that provides delay functionality on top of `thread::sleep`
+/// Empty struct that provides delay functionality on top of `thread::sleep`,
+/// and `tokio::time::sleep` if the `async-tokio` feature is enabled.
 pub struct Delay;
 
 impl DelayNs for Delay {
     fn delay_ns(&mut self, n: u32) {
-        thread::sleep(Duration::from_nanos(u64(n)));
+        thread::sleep(Duration::from_nanos(n.into()));
+    }
+}
+
+#[cfg(feature = "async-tokio")]
+impl embedded_hal_async::delay::DelayNs for Delay {
+    async fn delay_ns(&mut self, n: u32) {
+        tokio::time::sleep(Duration::from_nanos(n.into())).await;
     }
 }

From b80b2f8f887796bb907fbc2d8d0ca949c7ca57e5 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Wed, 24 Jan 2024 20:01:44 +0100
Subject: [PATCH 2/4] Also implement `delay_us` and `delay_ms`.

---
 src/delay.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/delay.rs b/src/delay.rs
index 7dac367..b9eaea9 100644
--- a/src/delay.rs
+++ b/src/delay.rs
@@ -14,6 +14,14 @@ impl DelayNs for Delay {
     fn delay_ns(&mut self, n: u32) {
         thread::sleep(Duration::from_nanos(n.into()));
     }
+
+    fn delay_us(&mut self, n: u32) {
+        thread::sleep(Duration::from_micros(n.into()));
+    }
+
+    fn delay_ms(&mut self, n: u32) {
+        thread::sleep(Duration::from_millis(n.into()));
+    }
 }
 
 #[cfg(feature = "async-tokio")]
@@ -21,4 +29,12 @@ impl embedded_hal_async::delay::DelayNs for Delay {
     async fn delay_ns(&mut self, n: u32) {
         tokio::time::sleep(Duration::from_nanos(n.into())).await;
     }
+
+    async fn delay_us(&mut self, n: u32) {
+        tokio::time::sleep(Duration::from_micros(n.into())).await;
+    }
+
+    async fn delay_ms(&mut self, n: u32) {
+        tokio::time::sleep(Duration::from_millis(n.into())).await;
+    }
 }

From 6f8c35632d03ba5b9e0129727089ff1fac260a35 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Wed, 24 Jan 2024 19:54:01 +0100
Subject: [PATCH 3/4] Increase Rust version used for `clippy`.

---
 .github/workflows/clippy.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clippy.yml b/.github/workflows/clippy.yml
index f5fc395..af11e80 100644
--- a/.github/workflows/clippy.yml
+++ b/.github/workflows/clippy.yml
@@ -13,6 +13,6 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.73.0
+          toolchain: 1.75.0
           components: clippy
       - run: cargo clippy --all-features -- --deny=warnings

From f7b1505a1eecd2a9e4c9e9c39ecbfd122534e13a Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Wed, 24 Jan 2024 20:03:46 +0100
Subject: [PATCH 4/4] Update changelog.

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8d0219..06cdae9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Added
+
+- Added async `DelayNs` implementation for `tokio`.
+
 ## [v0.4.0] - 2024-01-10
 
 ### Changed