From b6cc800a702d75b045631c4d8ed68e81aabd8112 Mon Sep 17 00:00:00 2001
From: Andrew Walbran <qwandor@google.com>
Date: Tue, 16 Apr 2024 15:18:04 +0100
Subject: [PATCH] Add more compiler fences.

---
 nrf-hal-common/src/twim.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/nrf-hal-common/src/twim.rs b/nrf-hal-common/src/twim.rs
index 2071684d..d7eaa827 100644
--- a/nrf-hal-common/src/twim.rs
+++ b/nrf-hal-common/src/twim.rs
@@ -399,6 +399,7 @@ where
     }
 
     fn write_part(&mut self, buffer: &[u8], final_operation: bool) -> Result<(), Error> {
+        compiler_fence(SeqCst);
         unsafe { self.set_tx_buffer(buffer)? };
 
         // Set appropriate lasttx shortcut.
@@ -413,6 +414,7 @@ where
         self.0.tasks_resume.write(|w| unsafe { w.bits(1) });
 
         self.wait();
+        compiler_fence(SeqCst);
         self.read_errorsrc()?;
         if self.0.txd.amount.read().bits() != buffer.len() as u32 {
             return Err(Error::Transmit);
@@ -435,6 +437,7 @@ where
         self.0.tasks_resume.write(|w| unsafe { w.bits(1) });
 
         self.wait();
+        compiler_fence(SeqCst);
         self.read_errorsrc()?;
         if self.0.rxd.amount.read().bits() != buffer.len() as u32 {
             return Err(Error::Receive);