From 3979185e0e23b7eecd015974e38c86221716bef8 Mon Sep 17 00:00:00 2001
From: Josef Utbult <josutb-7@student.ltu.se>
Date: Fri, 5 Mar 2021 15:14:53 +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 f9f2fe7..28e5e2e 100644
--- a/examples/rtic_bare4.rs
+++ b/examples/rtic_bare4.rs
@@ -36,8 +36,8 @@ use address::*;
// Here we have low level access to a bit in a register
#[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 _)
}
// Here we have low level access to a bit in a register
@@ -102,12 +102,13 @@ const APP: () = {
//
// What was the error message and explain why.
//
-// ** your answer here **
+// error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+// I guess this is because you cant make sure that the adress is valid.
//
// 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 **
+// Because you can get undefined behaviour
//
// Commit your answers (bare4_2)
//
--
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