bare0 almost done

examples/bare0.rs

@@ -26,8 +26,8 @@ extern crate panic_semihosting;
 use cortex_m_rt::entry;
 
 // a constant (cannot be changed at run-time)
-const X_INIT: u32 = 10;
-//const X_INIT: u32 = core::u32::MAX;
+//const X_INIT: u32 = 10;
+const X_INIT: u32 = core::u32::MAX;
 
 // global mutable variables (changed using unsafe code)
 static mut X: u32 = X_INIT;
@@ -39,11 +39,10 @@ fn main() -> ! {
     let mut x = unsafe { X };
 
     loop {
-        x += 1; // <- place breakpoint here (3)
+       x = x.wrapping_add(1); // <- place breakpoint here (3)
         unsafe {
-            X += 1;
-            Y = X;
-            assert!(x == X && X == Y);
+           X = X.wrapping_add(1);
+           Y = X;
         }
     }
 }
@@ -79,7 +78,7 @@ fn main() -> ! {
 // 	  What happens when `x` wraps
 //    (Hint, look under OUTPUT/Adopter Output to see the `openocd` output.)
 //
-//    ** your answer here **
+//    The programs starts to panic.
 //
 //    Commit your answers (bare0_2)
 //
@@ -87,10 +86,10 @@ fn main() -> ! {
 //
 //    Change (both) += operations to use wrapping_add
 //    load and run the program, what happens
-//    ** your answer here **
+//    The program does not panic this time, and instead x wraps to 0, as it should.
 //
 //    Now continue execution, what happens
-//    ** your answer here **
+//    The program goes to the breakpoint every time we press continue, and 1 is added to x, every time.
 //
 //    Commit your answers (bare0_3)
 //
@@ -99,7 +98,7 @@ fn main() -> ! {
 //
 // 4. Change the assertion to `assert!(x == X && X == Y + 1)`, what happens?
 //
-//    ** place your answer here **
+//    The programs starts to panic.
 //
 //    Commit your answers (bare0_4)
 //