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/

colourconverters.cpp@6:8df79fe1afcd, 2015-09-03 (annotated)

Committer:
Bobty
Date:
Thu Sep 03 20:17:23 2015 +0000
Revision:
6:8df79fe1afcd
Parent:
0:887096209439 
Fixed an unforeseen problem with messages not aligned on RGB boundaries; Fixed potential hanging pointer problem in colourconverters; Changed Idle screen to a set of colourful snakes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bobty 0:887096209439 1 #include "colourconverters.h"
Bobty 0:887096209439 2
Bobty 6:8df79fe1afcd 3 void HsvToRgb(HsvColor hsv, RgbColor& rgb)
Bobty 0:887096209439 4 {
Bobty 0:887096209439 5 unsigned char region, remainder, p, q, t;
Bobty 0:887096209439 6
Bobty 0:887096209439 7 if (hsv.s == 0)
Bobty 0:887096209439 8 {
Bobty 0:887096209439 9 rgb.r = hsv.v;
Bobty 0:887096209439 10 rgb.g = hsv.v;
Bobty 0:887096209439 11 rgb.b = hsv.v;
Bobty 6:8df79fe1afcd 12 return;
Bobty 0:887096209439 13 }
Bobty 0:887096209439 14
Bobty 0:887096209439 15 region = hsv.h / 43;
Bobty 0:887096209439 16 remainder = (hsv.h - (region * 43)) * 6;
Bobty 0:887096209439 17
Bobty 0:887096209439 18 p = (hsv.v * (255 - hsv.s)) >> 8;
Bobty 0:887096209439 19 q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8;
Bobty 0:887096209439 20 t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8;
Bobty 0:887096209439 21
Bobty 0:887096209439 22 switch (region)
Bobty 0:887096209439 23 {
Bobty 0:887096209439 24 case 0:
Bobty 0:887096209439 25 rgb.r = hsv.v; rgb.g = t; rgb.b = p;
Bobty 0:887096209439 26 break;
Bobty 0:887096209439 27 case 1:
Bobty 0:887096209439 28 rgb.r = q; rgb.g = hsv.v; rgb.b = p;
Bobty 0:887096209439 29 break;
Bobty 0:887096209439 30 case 2:
Bobty 0:887096209439 31 rgb.r = p; rgb.g = hsv.v; rgb.b = t;
Bobty 0:887096209439 32 break;
Bobty 0:887096209439 33 case 3:
Bobty 0:887096209439 34 rgb.r = p; rgb.g = q; rgb.b = hsv.v;
Bobty 0:887096209439 35 break;
Bobty 0:887096209439 36 case 4:
Bobty 0:887096209439 37 rgb.r = t; rgb.g = p; rgb.b = hsv.v;
Bobty 0:887096209439 38 break;
Bobty 0:887096209439 39 default:
Bobty 0:887096209439 40 rgb.r = hsv.v; rgb.g = p; rgb.b = q;
Bobty 0:887096209439 41 break;
Bobty 0:887096209439 42 }
Bobty 0:887096209439 43 }
Bobty 0:887096209439 44
Bobty 6:8df79fe1afcd 45 void RgbToHsv(RgbColor rgb, HsvColor& hsv)
Bobty 0:887096209439 46 {
Bobty 0:887096209439 47 unsigned char rgbMin, rgbMax;
Bobty 0:887096209439 48
Bobty 0:887096209439 49 rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b);
Bobty 0:887096209439 50 rgbMax = rgb.r > rgb.g ? (rgb.r > rgb.b ? rgb.r : rgb.b) : (rgb.g > rgb.b ? rgb.g : rgb.b);
Bobty 0:887096209439 51
Bobty 0:887096209439 52 hsv.v = rgbMax;
Bobty 0:887096209439 53 if (hsv.v == 0)
Bobty 0:887096209439 54 {
Bobty 0:887096209439 55 hsv.h = 0;
Bobty 0:887096209439 56 hsv.s = 0;
Bobty 6:8df79fe1afcd 57 return;
Bobty 0:887096209439 58 }
Bobty 0:887096209439 59
Bobty 0:887096209439 60 hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v;
Bobty 0:887096209439 61 if (hsv.s == 0)
Bobty 0:887096209439 62 {
Bobty 0:887096209439 63 hsv.h = 0;
Bobty 6:8df79fe1afcd 64 return;
Bobty 0:887096209439 65 }
Bobty 0:887096209439 66
Bobty 0:887096209439 67 if (rgbMax == rgb.r)
Bobty 0:887096209439 68 hsv.h = 0 + 43 * (rgb.g - rgb.b) / (rgbMax - rgbMin);
Bobty 0:887096209439 69 else if (rgbMax == rgb.g)
Bobty 0:887096209439 70 hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin);
Bobty 0:887096209439 71 else
Bobty 0:887096209439 72 hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin);
Bobty 0:887096209439 73 }