From d2e2bb169520a90857d7c5aee0dc031c24c3b771 Mon Sep 17 00:00:00 2001
From: Olaf Rempel <razzor@kopf-tisch.de>
Date: Sun, 11 Mar 2012 13:08:06 +0100
Subject: [PATCH] use helper functions

---
 main.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/main.c b/main.c
index b4da684..d963b6c 100644
--- a/main.c
+++ b/main.c
@@ -130,13 +130,20 @@ void color_div(uint8_t *color, uint8_t div, uint8_t *output)
 {
     uint8_t i;
     for (i = 0; i < 3; i++) {
-        output[i] = color[i] / div;
-        if ((output[i] == 0) && (color[i] != 0)) {
-            output[i] = 0x01;
+        if (color[i] != 0) {
+            output[i] = color[i] / div;
+            if (output[i] == 0) {
+                output[i] = 0x01;
+            }
+
+        } else {
+            output[i] = 0x00;
         }
     }
 }
 
+static uint8_t chan_decay[16][3];
+
 int main(void) __attribute__ ((noreturn));
 int main(void)
 {
@@ -152,7 +159,6 @@ int main(void)
     uint8_t x = 0;
     uint8_t xdir = 1;
     uint16_t ramp = 0;
-    uint8_t step = 0;
 
     /* wait for complete update */
     rgb_update(COLOR_MASK, 1);
@@ -163,24 +169,17 @@ int main(void)
         /* wait for complete update */
         rgb_update(COLOR_MASK, 1);
 
-//         _delay_ms(1);
+        _delay_ms(50);
 
 #if 1
-        step++;
-        if (step == 16) {
-            step = 0;
-            x = sequence_chase(x, &xdir, 0x1F1F);
-        }
+        x = sequence_chase(x, &xdir, 0x1F1F);
+        ramp = color_ramp(ramp +8, chan_value[x]);
+        color_div(chan_value[x], 4, chan_decay[x]);
 
-        uint8_t color[3] = { 0, 0, 0 };
-        ramp = color_ramp(ramp +1, chan_value[x]);
-
-        uint8_t i, j;
+        uint8_t i;
         for (i = 0; i < 16; i++) {
             if (x != i) {
-                chan_value[i][0] = 0;
-                chan_value[i][1] = 0;
-                chan_value[i][2] = 0;
+                color_sub(chan_value[i], chan_decay[i], chan_value[i]);
             }
         }
 #endif