1 files changed, 4 insertions, 1 deletions
diff --git a/examples/periodic.rs b/examples/periodic.rs
index f84744a..405346e 100644
--- a/examples/periodic.rs
+++ b/examples/periodic.rs
@@ -29,7 +29,10 @@ const APP: () = {
         cx.schedule.foo(cx.scheduled + PERIOD.cycles()).unwrap();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };