only re-export core peripherals available on all Cortex-M devices

Author: japaric

src/generate.rs

@@ -86,6 +86,7 @@ pub fn device(d: &Device, target: &Target, items: &mut Vec<Tokens>) -> Result<()
     ::generate::interrupt(d, target, &d.peripherals, items);
 
     const CORE_PERIPHERALS: &[&str] = &[
+        "CBP",
         "CPUID",
         "DCB",
         "DWT",
@@ -106,13 +107,19 @@ pub fn device(d: &Device, target: &Target, items: &mut Vec<Tokens>) -> Result<()
             pub use cortex_m::peripheral::Peripherals as CorePeripherals;
         });
 
-        for p in CORE_PERIPHERALS {
-            let id = Ident::new(*p);
-
-            items.push(quote! {
-                pub use cortex_m::peripheral::#id;
-            });
-        }
+        // NOTE re-export only core peripherals available on *all* Cortex-M devices
+        // (if we want to re-export all core peripherals available for the target then we are going
+        // to need to replicate the `#[cfg]` stuff that cortex-m uses and that would require all
+        // device crates to define the custom `#[cfg]`s that cortex-m uses in their build.rs ...)
+        items.push(quote! {
+            pub use cortex_m::peripheral::CPUID;
+            pub use cortex_m::peripheral::DCB;
+            pub use cortex_m::peripheral::DWT;
+            pub use cortex_m::peripheral::MPU;
+            pub use cortex_m::peripheral::NVIC;
+            pub use cortex_m::peripheral::SCB;
+            pub use cortex_m::peripheral::SYST;
+        });
     }
 
     for p in &d.peripherals {