bare4_2

examples/bare4.rs

@@ -36,8 +36,8 @@ 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)]
@@ -107,12 +107,14 @@ fn main() -> ! {
 //
 //    What was the error message and explain why.
 //
-//    ** your answer here **
+//    call to unsafe function is unsafe and requires unsafe function or block.
+//    This happens because the variable is volatile. 
 //
 //    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 **
+//    The volatile value might not be guaranteed to be the same between reads. So it is declared unsafe since it might not
+//    be the same as intended.
 //
 //    Commit your answers (bare4_2)
 //