Rob Dobson
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/ 
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/
Revision 6:8df79fe1afcd, committed 2015-09-03
- Comitter:
- Bobty
- Date:
- Thu Sep 03 20:17:23 2015 +0000
- Parent:
- 5:910909f34907
- Commit message:
- 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
Changed in this revision
diff -r 910909f34907 -r 8df79fe1afcd DrawingManager.cpp
--- a/DrawingManager.cpp Tue Sep 01 15:53:52 2015 +0000
+++ b/DrawingManager.cpp Thu Sep 03 20:17:23 2015 +0000
@@ -11,6 +11,7 @@
{
pLedStrip = NULL;
isBusy = false;
+ rawFillPayloadOverhangBytes = 0;
}
void DrawingManager::Init(int numLeds, int splitPoint)
@@ -35,10 +36,28 @@
int startLed = GetIntFromNameValPair(args, "start=", -1);
if (startLed != -1 && payloadLen > 0)
{
- int numLeds = payloadLen / 3;
+ // Include any overhang bytes from the last payload
+ int numLeds = (rawFillPayloadOverhangBytes + payloadLen) / 3;
int fromLed = startLed + (payloadOffset / 3);
+ unsigned char newPayload[numLeds*3];
+ memcpy(newPayload, pRawFillPayloadOverhang, rawFillPayloadOverhangBytes);
+ memcpy(newPayload+rawFillPayloadOverhangBytes, payload, numLeds*3-rawFillPayloadOverhangBytes);
+
+ // Send the data
// printf("RAWFILL fromLed %d numLeds %d\r\n", fromLed, numLeds);
- pLedStrip->RawFill(fromLed, numLeds, payload);
+// for (int i = 0; i < numLeds*3; i+=3)
+// {
+// printf("%02x %02x %02x\r\n", newPayload[i], newPayload[i+1], newPayload[i+2]);
+// }
+ pLedStrip->RawFill(fromLed, numLeds, newPayload);
+
+ // Save any overhanging bytes for the next fill
+ int overhangStart = (numLeds * 3) - rawFillPayloadOverhangBytes;
+ rawFillPayloadOverhangBytes = rawFillPayloadOverhangBytes + payloadLen - (numLeds * 3);
+ for (int i = 0; i < rawFillPayloadOverhangBytes; i++)
+ {
+ pRawFillPayloadOverhang[i] = payload[overhangStart + i];
+ }
}
}
@@ -65,6 +84,7 @@
void DrawingManager::ShowLeds()
{
// printf("SHOWLEDS\r\n");
+ rawFillPayloadOverhangBytes = 0;
if (pLedStrip)
pLedStrip->ShowLeds();
}
@@ -77,12 +97,22 @@
if (pLedStrip->IsBusy())
return;
pLedStrip->Clear();
- int ledsPerGroup = pLedStrip->GetNumLeds() / 10;
- for (int i = 0; i < pLedStrip->GetNumLeds(); i += ledsPerGroup)
+ int numSnakes = 15;
+ int ledsPerGroup = pLedStrip->GetNumLeds() / numSnakes;
+ int snakeLen = 10;
+ int snakeStep = stepCount % ledsPerGroup;
+ int colrBase = (stepCount / ledsPerGroup);
+ // Create a set of colourful snakes that roam around the wall
+ for (int i = 0; i < numSnakes; i ++)
{
- RgbColor colrVal((stepCount * 7) + (i * 23) % 64, (stepCount * 17) + 77 + (i * 3) % 64, (stepCount * 37) + 117 + (i * 13) % 64);
- RgbColor colrVal2((stepCount * 17) + (i * 33) % 64, (stepCount * 3) + 13 + (i * 13) % 64, (stepCount * 77) + 11 + (i * 23) % 64);
- pLedStrip->Fill(i,ledsPerGroup,colrVal.r, colrVal.g, colrVal.b, colrVal2.r, colrVal2.g, colrVal2.b);
+ HsvColor hsv1(((colrBase + i) * 237) % 255, 128, 10);
+ RgbColor rgb1(0,0,0);
+ HsvToRgb(hsv1, rgb1);
+ HsvColor hsv2(((colrBase + i + 27) * 13) % 255, 255, 255);
+ RgbColor rgb2(0,0,0);
+ HsvToRgb(hsv2, rgb2);
+ pLedStrip->Fill((i*ledsPerGroup)+snakeStep,snakeLen/2, rgb1.r, rgb1.g, rgb1.b, rgb2.r, rgb2.g, rgb2.b);
+ pLedStrip->Fill((i*ledsPerGroup)+snakeStep+snakeLen/2, snakeLen/2, rgb2.r, rgb2.g, rgb2.b, rgb1.r, rgb1.g, rgb1.b);
}
pLedStrip->ShowLeds();
}
diff -r 910909f34907 -r 8df79fe1afcd DrawingManager.h
--- a/DrawingManager.h Tue Sep 01 15:53:52 2015 +0000
+++ b/DrawingManager.h Thu Sep 03 20:17:23 2015 +0000
@@ -24,6 +24,8 @@
ledstrip* pLedStrip;
bool isBusy;
int GetIntFromNameValPair(char* buf, char* name, int invalidVal);
+ unsigned char pRawFillPayloadOverhang[2];
+ int rawFillPayloadOverhangBytes;
};
#endif
diff -r 910909f34907 -r 8df79fe1afcd Idler.cpp
--- a/Idler.cpp Tue Sep 01 15:53:52 2015 +0000
+++ b/Idler.cpp Thu Sep 03 20:17:23 2015 +0000
@@ -2,6 +2,7 @@
#include "Idler.h"
DigitalOut* Idler::_pStatusLed = NULL;
+bool Idler::_isRunning = false;
bool Idler::_isIdle = true;
unsigned int Idler::_stepCount = 0;
DrawingManager* Idler::_pDrawingManager = NULL;
@@ -17,8 +18,17 @@
_idleTicker.attach(&tick, 0.1);
}
+void Idler::start()
+{
+ _isRunning = true;
+}
+
void Idler::tick()
{
+ // Check if we are running
+ if (!_isRunning)
+ return;
+
// Check if idle
if (!_isIdle)
{
diff -r 910909f34907 -r 8df79fe1afcd Idler.h
--- a/Idler.h Tue Sep 01 15:53:52 2015 +0000
+++ b/Idler.h Thu Sep 03 20:17:23 2015 +0000
@@ -11,9 +11,11 @@
static void tick();
static void notIdle();
static void displayStep();
+ static void start();
private:
static DigitalOut* _pStatusLed;
+ static bool _isRunning;
static bool _isIdle;
static unsigned int _stepCount;
static DrawingManager* _pDrawingManager;
diff -r 910909f34907 -r 8df79fe1afcd colourconverters.cpp
--- 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;
}
diff -r 910909f34907 -r 8df79fe1afcd colourconverters.h --- a/colourconverters.h Tue Sep 01 15:53:52 2015 +0000 +++ b/colourconverters.h Thu Sep 03 20:17:23 2015 +0000 @@ -30,8 +30,8 @@ } HsvColor; -RgbColor HsvToRgb(HsvColor hsv); +void HsvToRgb(HsvColor hsv, RgbColor& rgb); -HsvColor RgbToHsv(RgbColor rgb); +void RgbToHsv(RgbColor rgb, HsvColor& hsv); #endif
diff -r 910909f34907 -r 8df79fe1afcd ledstrip.cpp
--- a/ledstrip.cpp Tue Sep 01 15:53:52 2015 +0000
+++ b/ledstrip.cpp Thu Sep 03 20:17:23 2015 +0000
@@ -160,7 +160,8 @@
// Copy over the values converting each to RGB
for (int i = 0; i < numLeds; i++)
{
- RgbColor colrVal = HsvToRgb(HsvColor(pLedVals[0],pLedVals[1] & 0xf0, (pLedVals[1] << 4) & 0xf0));
+ RgbColor colrVal(0,0,0);
+ HsvToRgb(HsvColor(pLedVals[0],pLedVals[1] & 0xf0, (pLedVals[1] << 4) & 0xf0), colrVal);
pBuf[pos] = colrVal.r;
pBuf[pos+1] = colrVal.g;
pBuf[pos+2] = colrVal.b;
@@ -209,9 +210,11 @@
numLeds = mLedsInStrip - startLed;
int pos = startLed * mColoursPerLed;
RgbColor startRGB(r1,g1,b1);
- HsvColor startHsv = RgbToHsv(startRGB);
+ HsvColor startHsv(0,0,0);
+ RgbToHsv(startRGB, startHsv);
RgbColor endRGB(r2,g2,b2);
- HsvColor endHsv = RgbToHsv(endRGB);
+ HsvColor endHsv(0,0,0);
+ RgbToHsv(endRGB, endHsv);
int curH = startHsv.h << 16;
int curS = startHsv.s << 16;
int curV = startHsv.v << 16;
@@ -238,7 +241,8 @@
unsigned char* pBuf = GetBuffer();
for (int i = 0; i < numLeds; i++)
{
- RgbColor colrVal = HsvToRgb(HsvColor((curH>>16)&0xff,curS>>16,curV>>16));
+ RgbColor colrVal(0,0,0);
+ HsvToRgb(HsvColor((curH>>16)&0xff,curS>>16,curV>>16), colrVal);
pBuf[pos] = colrVal.r;
pBuf[pos+1] = colrVal.g;
pBuf[pos+2] = colrVal.b;
diff -r 910909f34907 -r 8df79fe1afcd main.cpp
--- a/main.cpp Tue Sep 01 15:53:52 2015 +0000
+++ b/main.cpp Thu Sep 03 20:17:23 2015 +0000
@@ -139,13 +139,19 @@
// Init
pc.baud(115200);
pc.printf("Light Wall - Rob Dobson 2015\r\n");
+
+ // Wait for a moment
+ wait(1);
// Get the configuration of the system
getSystemConfig();
-
+
// Drawing manager controls the LEDs
drawingManager.Init(systemNumLEDS, systemLEDSSplitPoint);
+ // Start idler
+ idler.start();
+
// Setup ethernet interface
char macAddr[6];
mbed_mac_address(macAddr);