Round up in delay_nanos (#2256)

esp-hal/CHANGELOG.md

@@ -77,6 +77,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - PARL_IO: Fixed an issue that caused garbage to be output at the start of some requests (#2211)
 - TWAI on ESP32 (#2207)
 - TWAI should no longer panic when receiving a non-compliant frame (#2255)
+- OneShotTimer: fixed `delay_nanos` behaviour (#2256)
 
 ### Removed
 

esp-hal/src/timer/mod.rs

@@ -138,7 +138,7 @@ where
 
     /// Pauses execution for *at least* `ns` nanoseconds.
     pub fn delay_nanos(&self, ns: u32) {
-        self.delay((ns as u64 / 1000).micros())
+        self.delay((ns.div_ceil(1000) as u64).micros())
     }
 
     fn delay(&self, us: MicrosDurationU64) {