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/

main.cpp

Committer:
Bobty
Date:
2015-08-18
Revision:
0:887096209439
Child:
1:362331cec9b7

File content as of revision 0:887096209439:

/* main.cpp
   Rob Dobson 2013
   More details at ???
*/

#include "mbed.h"
#include "EthernetInterface.h"
#include <stdio.h>
#include <string.h>
#include "RdWebServer.h"
#include "ledstrip.h"
#include "LedCmdHandler.h"

#define PORT   80

Serial pc(USBTX, USBRX);

RdWebServer webServer;

EthernetInterface eth;

DigitalOut led1(LED1); //server listning status
DigitalOut led2(LED2); //socket connecting status

Ticker ledTick;

char nameOfLights[50];
int ledsCount = 904;
int ledSplitPoint = 448;
ledstrip* pLedStrip = NULL;

char* indexHtmName = "index.htm";

const int TICK_MS = 100;
LedCmdHandler* pLedCmdHandler = NULL;
int blinkCtr = 0;

void ledTickfunc()
{
    if(webServer.isListening())
    {
        blinkCtr++;
        if (blinkCtr > 1)
        {
            led1 = !led1;
            blinkCtr = 0;
        }
    }
    else
    {
        led1 = false;
    }
    
    if (pLedCmdHandler != NULL)
        pLedCmdHandler->NextGen();
}

void handleCmd_ledControl(char* cmdStr, char* argStr)
{
    printf("LEDS COMMAND %s %s\r\n", cmdStr, argStr);
    if (argStr == NULL)
        return;
    pLedCmdHandler->DoCommand(argStr);
    
    // Store last command
    LocalFileSystem local("local");
    FILE* fp = fopen("/local/lastcmd.inf", "w");
    if (fp != NULL)
    {
        fwrite(argStr, 1, strlen(argStr)+1, fp);
        fclose(fp);
    }    
}

void reRunLastCommand()
{
    // Store last command
    LocalFileSystem local("local");
    FILE* fp = fopen("/local/lastcmd.inf", "r");
    if (fp != NULL)
    {
        char buf[501];
        buf[sizeof(buf)-1] = 0;
        int nread = fread(buf, 1, sizeof(buf), fp);
        fclose(fp);
        if (nread > 0 && nread <= sizeof(buf))
        {
            buf[nread] = 0;
            pLedCmdHandler->DoCommand(buf);
        }
    }    
}

#include "colourconverters.h"

void BodgeSmooth(ledstrip* pLedStrip)
{
    pLedStrip->Clear();
    pLedStrip->ShowLeds();


    RgbColor startRGB(50,0,0);
    HsvColor curHsv = RgbToHsv(startRGB);
    while(1)
    for (int k = 0; k < 1000; k++)
    for (int j = 0; j < 255; j++)
    {
        pLedStrip->Clear();
        RgbColor colrVal = HsvToRgb(curHsv);        
        pLedStrip->Fill(0,pLedStrip->GetNumLeds(),colrVal.r, colrVal.g, colrVal.b);
        pLedStrip->ShowLeds();
        wait_ms(250);
        curHsv.h++;
    }
}

void setLightsConfig()
{
    printf("Rob LightWall - Configured for ");
    // Check for a config file on the local file system
    strcpy(nameOfLights, "Spidey");
    LocalFileSystem local("local");
    FILE* fp = fopen("/local/spidey.cnf", "r");
    if (fp != NULL)
    {
        char buf[201];
        buf[sizeof(buf)-1] = 0;
        int nread = fread(buf, 1, sizeof(buf), fp);
        if (nread > 0 && nread <= sizeof(buf))
        {
            buf[nread] = 0;
            sscanf(buf, "%s %d %d", nameOfLights, &ledsCount, &ledSplitPoint);
        }
        fclose(fp);
        printf("%s (%d LEDs, Split at %d)", nameOfLights, ledsCount, ledSplitPoint);
        printf("\n\r");
    }
    
    // Leds setup
    pLedStrip = new ledstrip(ledsCount, ledSplitPoint);
    wait_ms(100);
    pLedStrip->Clear();
    pLedStrip->ShowLeds();

    // Cmd handler
    pLedCmdHandler = new LedCmdHandler(pLedStrip);
}

int main (void)
{
    pc.baud(115200);
    
    setLightsConfig();
    
    BodgeSmooth(pLedStrip);
    
    ledTick.attach(&ledTickfunc,TICK_MS / 1000.0);

//    reRunLastCommand();
    
    // setup ethernet interface
    eth.init(); //Use DHCP
    eth.connect();
    printf("IP Address is %s\n\r", eth.getIPAddress());

    webServer.addCommand("", RdWebServerCmdDef::CMD_LOCALFILE, NULL, indexHtmName, true);
    webServer.addCommand("cmd", RdWebServerCmdDef::CMD_CALLBACK, &handleCmd_ledControl);
    webServer.init(PORT, &led2);
    webServer.run();
}