rtic-monotonics: Implement blocking DelayUs from embedded-hal 1

rtic-monotonics/src/nrf/rtc.rs

@@ -180,6 +180,13 @@ macro_rules! make_rtc {
             }
         }
 
+        impl embedded_hal::delay::DelayUs for $mono_name {
+            fn delay_us(&mut self, us: u32) {
+                let done = Self::now() + u64::from(us).micros();
+                while Self::now() < done {}
+            }
+        }
+
         impl Monotonic for $mono_name {
             const ZERO: Self::Instant = Self::Instant::from_ticks(0);
 

rtic-monotonics/src/nrf/timer.rs

@@ -216,6 +216,13 @@ macro_rules! make_timer {
             }
         }
 
+        impl embedded_hal::delay::DelayUs for $mono_name {
+            fn delay_us(&mut self, us: u32) {
+                let done = Self::now() + (us as u64).micros();
+                while Self::now() < done {}
+            }
+        }
+
         impl Monotonic for $mono_name {
             const ZERO: Self::Instant = Self::Instant::from_ticks(0);
 

rtic-monotonics/src/rp2040.rs

@@ -162,6 +162,13 @@ impl embedded_hal_async::delay::DelayUs for Timer {
     }
 }
 
+impl embedded_hal::delay::DelayUs for Timer {
+    fn delay_us(&mut self, us: u32) {
+        let done = Self::now() + u64::from(us).micros();
+        while Self::now() < done {}
+    }
+}
+
 /// Register the Timer interrupt for the monotonic.
 #[macro_export]
 macro_rules! create_rp2040_monotonic_token {

rtic-monotonics/src/stm32.rs

@@ -230,6 +230,13 @@ macro_rules! make_timer {
             }
         }
 
+        impl embedded_hal::delay::DelayUs for $mono_name {
+            fn delay_us(&mut self, us: u32) {
+                let done = Self::now() + (us as u64).micros();
+                while Self::now() < done {}
+            }
+        }
+
         impl Monotonic for $mono_name {
             type Instant = fugit::TimerInstantU64<TIMER_HZ>;
             type Duration = fugit::TimerDurationU64<TIMER_HZ>;

rtic-monotonics/src/systick.rs

@@ -203,6 +203,15 @@ impl embedded_hal_async::delay::DelayUs for Systick {
     }
 }
 
+impl embedded_hal::delay::DelayUs for Systick {
+    fn delay_us(&mut self, us: u32) {
+        #[cfg(feature = "systick-64bit")]
+        let us = u64::from(us);
+        let done = Self::now() + us.micros();
+        while Self::now() < done {}
+    }
+}
+
 /// Register the Systick interrupt for the monotonic.
 #[macro_export]
 macro_rules! create_systick_token {