From 406f3b7cbf2242be2e455a748352265cfb65f750 Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Mon, 15 Feb 2021 01:22:38 +0100
Subject: [PATCH] rtc: use SeqCst for periods.

---
 embassy-nrf/src/rtc.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/embassy-nrf/src/rtc.rs b/embassy-nrf/src/rtc.rs
index 5d1cc0ee..079e9b32 100644
--- a/embassy-nrf/src/rtc.rs
+++ b/embassy-nrf/src/rtc.rs
@@ -143,7 +143,7 @@ impl<T: Instance> RTC<T> {
 
     fn next_period(&self) {
         interrupt::free(|cs| {
-            let period = self.period.fetch_add(1, Ordering::Relaxed) + 1;
+            let period = self.period.fetch_add(1, Ordering::SeqCst) + 1;
             let t = (period as u64) << 23;
 
             for n in 0..ALARM_COUNT {
@@ -231,7 +231,7 @@ impl<T: Instance> RTC<T> {
 impl<T: Instance> embassy::time::Clock for RTC<T> {
     fn now(&self) -> u64 {
         // `period` MUST be read before `counter`, see comment at the top for details.
-        let period = self.period.load(Ordering::Relaxed);
+        let period = self.period.load(Ordering::SeqCst);
         let counter = self.rtc.counter.read().bits();
         calc_now(period, counter)
     }