From c7e426655dfb82d932d7f63dc73838cd090dbfb5 Mon Sep 17 00:00:00 2001
From: huntc <huntchr@gmail.com>
Date: Mon, 18 Oct 2021 11:28:43 +1100
Subject: [PATCH] Ensure the compiler doesn't reorder things before calling the
 sampler

---
 embassy-nrf/src/saadc.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/embassy-nrf/src/saadc.rs b/embassy-nrf/src/saadc.rs
index fd7e64e7..41644120 100644
--- a/embassy-nrf/src/saadc.rs
+++ b/embassy-nrf/src/saadc.rs
@@ -316,6 +316,8 @@ impl<'d, const N: usize> Saadc<'d, N> {
             WAKER.register(cx.waker());
 
             if r.events_end.read().bits() != 0 {
+                compiler_fence(Ordering::SeqCst);
+
                 r.events_end.reset();
                 r.intenset.write(|w| w.end().set());