rename periodic -> eq to be more consistent

examples/eq.rs

@@ -46,7 +46,7 @@ fn main() {
   let mut STATE = S8001;
 
   for i in 0..HORIZON {
-    periodic(
+    eq(
       &mut STATE,
       &mut TIMEOUT_CNTR,
       &mut DATA[i],
@@ -151,7 +151,7 @@ fn main() {
   }
 }
 
-fn periodic(
+fn eq(
   STATE: &mut State,
   TIMEOUT_CNTR: &mut u32,
   data: &Data,