Rob Dobson / Mbed 2 deprecated SpideyWallWeb

Spidey Wall is the name for a physical wall lit up by multiple addressable LED strips. This program is an LPC1768 web server to control the wall from a browser.

Dependencies:   EthernetInterfacePlusHostname RdWebServer mbed-rtos mbed

This project is part of a Light-Wall using addressable LED strips (WS2801). I have published a few posts on my blog about the construction of the wall and building a game to play on it (PacMan). I have also had a guest post from a friend who has set his children the task of producing some interesting animations. The original post is http://robdobson.com/2015/07/spidey-wall/ /media/uploads/Bobty/20130722_112945_img_9674_62895-1184x1579.jpg

So far, however, I hadn't fully connected the physical (and electronic) wall with the web-browser creations to drive it. This project is hopefully the final link. A fast and reliable web server using REST commands to drive the 1686 LEDs in the Spidey Wall from code running in a browser (say on an iPad while you are playing a game).

The approach taken here results in the ability to control the RGB values of all 1686 LEDs at a rate of 20 frames per second.

A blog post describing the whole thing is here:

http://robdobson.com/2015/08/a-reliable-mbed-webserver/

Diff: colourconverters.cpp

Revision:
6:8df79fe1afcd
Parent:
0:887096209439
--- a/colourconverters.cpp	Tue Sep 01 15:53:52 2015 +0000
+++ b/colourconverters.cpp	Thu Sep 03 20:17:23 2015 +0000
@@ -1,8 +1,7 @@
 #include "colourconverters.h"
 
-RgbColor HsvToRgb(HsvColor hsv)
+void HsvToRgb(HsvColor hsv, RgbColor& rgb)
 {
-    RgbColor rgb(0,0,0);
     unsigned char region, remainder, p, q, t;
 
     if (hsv.s == 0)
@@ -10,7 +9,7 @@
         rgb.r = hsv.v;
         rgb.g = hsv.v;
         rgb.b = hsv.v;
-        return rgb;
+        return;
     }
 
     region = hsv.h / 43;
@@ -41,13 +40,10 @@
             rgb.r = hsv.v; rgb.g = p; rgb.b = q;
             break;
     }
-
-    return rgb;
 }
 
-HsvColor RgbToHsv(RgbColor rgb)
+void RgbToHsv(RgbColor rgb, HsvColor& hsv)
 {
-    HsvColor hsv(0,0,0);
     unsigned char rgbMin, rgbMax;
 
     rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b);
@@ -58,14 +54,14 @@
     {
         hsv.h = 0;
         hsv.s = 0;
-        return hsv;
+        return;
     }
 
     hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v;
     if (hsv.s == 0)
     {
         hsv.h = 0;
-        return hsv;
+        return;
     }
 
     if (rgbMax == rgb.r)
@@ -74,6 +70,4 @@
         hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin);
     else
         hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin);
-
-    return hsv;
 }