Add a "reset defaults" button and handler.

1 files changed, 13 insertions, 3 deletions

diff --git a/main/pattern/twinkle.c b/main/pattern/twinkle.c
index d23b111..450cda6 100644
--- a/main/pattern/twinkle.c
+++ b/main/pattern/twinkle.c
@@ -1,8 +1,8 @@
+#include "pattern/twinkle.h"
+
 #include <stdint.h>
 #include <stdlib.h>
 
-#include "pattern/twinkle.h"
-
 // The shape of a "spike"
 uint8_t w_arr[91] = {1,   2,   4,   7,   11,  17,  24,  33,  44,  56,  70,  85,
                      101, 117, 134, 151, 167, 183, 197, 210, 222, 232, 240, 247,
@@ -36,7 +36,7 @@ static uint8_t pseudo_random(uint8_t x)
 }
 
 /* Produces a randomize "twinkle" effect. */
-uint8_t twinkle(uint32_t time, size_t x, uint8_t amt)
+static uint8_t twinkle_raw(uint32_t time, size_t x, uint8_t amt)
 {
   uint8_t time_offset = pseudo_random(x);
 
@@ -51,3 +51,13 @@ uint8_t twinkle(uint32_t time, size_t x, uint8_t amt)
     return 0;
   }
 }
+
+uint8_t twinkle(uint32_t time, size_t x, uint8_t amt)
+{
+  if (time % 2 == 0) {
+    return twinkle_raw(time / 2, x, amt);
+  } else {
+    return (twinkle_raw(time / 2, x, amt) + twinkle_raw(time / 2 + 1, x, amt)) /
+           2;
+  }
+}