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 5:910909f34907, committed 2015-09-01
- Comitter:
- Bobty
- Date:
- Tue Sep 01 15:53:52 2015 +0000
- Parent:
- 4:b521815f2657
- Child:
- 6:8df79fe1afcd
- Commit message:
- Added an idle handler so there is something to show when nothing is being sent over HTTP
Changed in this revision
--- a/DrawingManager.cpp Mon Aug 31 15:21:47 2015 +0000 +++ b/DrawingManager.cpp Tue Sep 01 15:53:52 2015 +0000 @@ -5,6 +5,7 @@ #include "DrawingManager.h" #include "rtos.h" +#include "colourconverters.h" DrawingManager::DrawingManager() { @@ -68,6 +69,24 @@ pLedStrip->ShowLeds(); } +void DrawingManager::DisplayIdle(unsigned int stepCount) +{ + // Display a step in an auto sequence + if (!pLedStrip) + return; + if (pLedStrip->IsBusy()) + return; + pLedStrip->Clear(); + int ledsPerGroup = pLedStrip->GetNumLeds() / 10; + for (int i = 0; i < pLedStrip->GetNumLeds(); i += ledsPerGroup) + { + 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); + } + pLedStrip->ShowLeds(); +} + int DrawingManager::GetIntFromNameValPair(char* buf, char* name, int invalidVal) { int val = invalidVal; @@ -76,3 +95,4 @@ val = atoi(pFnd + strlen(name)); return val; } +
--- a/DrawingManager.h Mon Aug 31 15:21:47 2015 +0000 +++ b/DrawingManager.h Tue Sep 01 15:53:52 2015 +0000 @@ -18,7 +18,7 @@ void RawFill(char* args, unsigned char* payload, int payloadLen, int payloadOffset); void Fill(char* args); void ShowLeds(); - + void DisplayIdle(unsigned int stepCount); private: ledstrip* pLedStrip;
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Idler.cpp Tue Sep 01 15:53:52 2015 +0000 @@ -0,0 +1,49 @@ + +#include "Idler.h" + +DigitalOut* Idler::_pStatusLed = NULL; +bool Idler::_isIdle = true; +unsigned int Idler::_stepCount = 0; +DrawingManager* Idler::_pDrawingManager = NULL; +Ticker Idler::_idleTicker; +Timer Idler::_idleTimer; + +const int IDLE_TIMEOUT = 10; // N seconds of no REST commands -> idle + +Idler::Idler(DigitalOut* pStatusLed, DrawingManager* pDrawingManager) +{ + _pStatusLed = pStatusLed; + _pDrawingManager = pDrawingManager; + _idleTicker.attach(&tick, 0.1); +} + +void Idler::tick() +{ + // Check if idle + if (!_isIdle) + { + // Check time since last notIdle + if (_idleTimer.read() < IDLE_TIMEOUT) + return; + + // Now idle again + _idleTimer.stop(); + _isIdle = true; + } + + // Blink LED + *_pStatusLed = !(*_pStatusLed); + + // Step through display + _pDrawingManager->DisplayIdle(_stepCount); + _stepCount++; +} + +void Idler::notIdle() +{ + _isIdle = false; + *_pStatusLed = false; + _idleTimer.reset(); + _idleTimer.start(); + _stepCount = 0; +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Idler.h Tue Sep 01 15:53:52 2015 +0000 @@ -0,0 +1,25 @@ +#ifndef IDLER__H +#define IDLER__H + +#include "mbed.h" +#include "DrawingManager.h" + +class Idler +{ + public: + Idler(DigitalOut* pStatusLed, DrawingManager* pDrawingManager); + static void tick(); + static void notIdle(); + static void displayStep(); + + private: + static DigitalOut* _pStatusLed; + static bool _isIdle; + static unsigned int _stepCount; + static DrawingManager* _pDrawingManager; + static Ticker _idleTicker; + static Timer _idleTimer; + +}; + +#endif
--- a/main.cpp Mon Aug 31 15:21:47 2015 +0000 +++ b/main.cpp Tue Sep 01 15:53:52 2015 +0000 @@ -10,6 +10,7 @@ #include "EthernetInterface.h" #include "RdWebServer.h" #include "DrawingManager.h" +#include "Idler.h" #include <string.h> // Web port @@ -30,6 +31,9 @@ // Drawing Manager DrawingManager drawingManager; +// Idler - to display something when not being driven by the web interface +Idler idler(&led2, &drawingManager); + // General response string for REST requests char* generalRespStr = "HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nAccess-Control-Allow-Origin: *\r\nAccess-Control-Allow-Methods: POST, GET, OPTIONS\r\nAccess-Control-Allow-Headers:accept, content-type\r\nContent-Length: 0\r\nContent-Type: application/octet-stream\r\n\r\n"; @@ -45,6 +49,7 @@ char* lightwallClear(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos) { + idler.notIdle(); drawingManager.Clear(); return generalRespStr; } @@ -54,6 +59,7 @@ char* lightwallRawFill(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos) { + idler.notIdle(); drawingManager.RawFill(argStr, pPayload, payloadLen, splitPayloadPos); return generalRespStr; } @@ -64,6 +70,7 @@ char* lightwallFill(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos) { + idler.notIdle(); drawingManager.Fill(argStr); return generalRespStr; } @@ -75,6 +82,7 @@ // Blink LED led1 = !led1; // Show LEDS + idler.notIdle(); drawingManager.ShowLeds(); return generalRespStr; } @@ -131,7 +139,7 @@ // Init pc.baud(115200); pc.printf("Light Wall - Rob Dobson 2015\r\n"); - + // Get the configuration of the system getSystemConfig(); @@ -143,14 +151,14 @@ mbed_mac_address(macAddr); pc.printf("Ethernet MAC address: %02x:%02x:%02x:%02x:%02x:%02x\r\n", macAddr[0], macAddr[1], macAddr[2], macAddr[3], macAddr[4], macAddr[5]); pc.printf("Connecting to ethernet ...\r\n"); - + // Init ethernet EthernetInterface::init(); // Using code described here https://developer.mbed.org/questions/1602/How-to-set-the-TCPIP-stack-s-hostname-pr/ // to setName on the ethernet interface EthernetInterface::setName(systemName); - + // Connect ethernet EthernetInterface::connect(); pc.printf("IP Address: %s HostName %s\r\n", EthernetInterface::getIPAddress(), EthernetInterface::getName()); @@ -161,7 +169,7 @@ // This is the previous code... // Thread httpServer(&http_server, NULL, osPriorityNormal, (DEFAULT_STACK_SIZE * 3)); http_server(""); - + // Forever - actually it won't even get here as the server has a forever loop in it too while(true) {