From 59d5a43dc3632577a62b7e66f038f47defb27061 Mon Sep 17 00:00:00 2001
From: Anton <anton.frappe@outlook.com>
Date: Wed, 3 Mar 2021 18:03:28 +0100
Subject: [PATCH] bare4_2
---
examples/rtic_bare4.rs | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/examples/rtic_bare4.rs b/examples/rtic_bare4.rs
index 6b4284b..9f7f176 100644
--- a/examples/rtic_bare4.rs
+++ b/examples/rtic_bare4.rs
@@ -35,8 +35,8 @@ use address::*;
#[inline(always)]
fn read_u32(addr: u32) -> u32 {
- unsafe { core::ptr::read_volatile(addr as *const _) }
- // core::ptr::read_volatile(addr as *const _)
+ //unsafe { core::ptr::read_volatile(addr as *const _) }
+ core::ptr::read_volatile(addr as *const _);
}
#[inline(always)]
@@ -100,12 +100,13 @@ const APP: () = {
//
// What was the error message and explain why.
//
-// ** your answer here **
+// This operation is unsafe and requires an unsafe function or block.
+// The function read_volatile is declared to be unsafe.
//
// Digging a bit deeper, why do you think `read_volatile` is declared `unsafe`.
// (https://doc.rust-lang.org/core/ptr/fn.read_volatile.html, for some food for thought )
//
-// ** your answer here **
+// It is unsafe because it can't guarantee the value is the expected value.
//
// Commit your answers (bare4_2)
//
--
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