From 4d82db1f972968a3fade39d80e8ca0fb1d8e7bc4 Mon Sep 17 00:00:00 2001
From: Nate Soares <nate@so8r.es>
Date: Wed, 3 Jan 2018 20:33:03 -0800
Subject: [PATCH] better wrap-around

---
 src/Kaleidoscope-LEDControl.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/Kaleidoscope-LEDControl.cpp b/src/Kaleidoscope-LEDControl.cpp
index b955892d..3a9a0d53 100644
--- a/src/Kaleidoscope-LEDControl.cpp
+++ b/src/Kaleidoscope-LEDControl.cpp
@@ -35,13 +35,15 @@ void LEDControl::next_mode(void) {
 }
 
 void LEDControl::prev_mode(void) {
-  mode--;
-
-  if (mode >= LED_MAX_MODES || !modes[mode]) {
-    return set_mode(0);
+  if (mode == 0) {
+    // wrap around
+    mode = LED_MAX_MODES;
+    // then  count down until reaching a valid mode
+    while (mode > 0 && !modes[mode]) mode--;
+  } else {
+    mode--;
   }
-
-  return set_mode(mode);
+  set_mode(mode);
 }
 
 void