From 8e636f0d1286cf905518022d42adf9624bed44df Mon Sep 17 00:00:00 2001
From: Danilo Bargen <mail@dbrgn.ch>
Date: Fri, 26 Jun 2020 23:46:09 +0200
Subject: Examples: Clarify extern section

Some beginners are confused about the "extern" section, so I added an
explanation comment to all examples. Furthermore, using the UARTx
interrupts when UART is actually being used in the same example may be
confusing, so I changed them all to SSI0/QEI0.
---
 examples/periodic.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'examples/periodic.rs')

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();
     }
 };
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