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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/
Diff: main.cpp
- Revision:
- 2:99eb4c6e9ea4
- Parent:
- 1:362331cec9b7
- Child:
- 3:e5ea80fae61d
diff -r 362331cec9b7 -r 99eb4c6e9ea4 main.cpp --- a/main.cpp Thu Aug 20 07:41:02 2015 +0000 +++ b/main.cpp Sat Aug 29 05:33:30 2015 +0000 @@ -1,5 +1,5 @@ // -// Spidey Wall WebServer +// LightWall WebServer // // Rob Dobson 2015 @@ -14,13 +14,18 @@ // Debugging and status RawSerial pc(USBTX, USBRX); -DigitalOut led1(LED1); // ticking (flashes) +DigitalOut led1(LED1); // flashes on command received DigitalOut led2(LED2); // DigitalOut led3(LED3); // DigitalOut led4(LED4); // web server status +// System configuration +char systemName[20] = "LightWall"; +int systemNumLEDS = 20; +int systemLEDSSplitPoint = systemNumLEDS; + // Drawing Manager -DrawingManager drawingManager(1686, 780); +DrawingManager drawingManager; //int ledsCount = 904; //int ledSplitPoint = 448; @@ -142,7 +147,7 @@ // // Cmd handler // pLedCmdHandler = new LedCmdHandler(pLedStrip); //} -// + //int main (void) //{ // pc.baud(115200); @@ -169,41 +174,83 @@ // Handle a command char* lightwallCmd(int method, char* cmdStr, char* argStr, char* msgBuf) { + // Blink LED + led1 = !led1; + + // Get message payload int cmdLen = RdWebServer::getPayloadLengthFromMsg(msgBuf); unsigned char* cmdBuf = RdWebServer::getPayloadDataFromMsg(msgBuf); pc.printf("Command Payload Len %d\r\n", cmdLen); - if (cmdLen == 256) - { - for (int i = 0; i < cmdLen; i++) - if (cmdBuf[i] != i) - { - printf("Binary content err at %d\r\n", i); - break; - } - } + + // Process command char* respStr = ""; respStr = drawingManager.start(cmdBuf, cmdLen); return respStr; } +// Get system name +char* lightwallGetSystemName(int method, char* cmdStr, char* argStr, char* msgBuf) +{ + // Return the system name + return systemName; +} + // Create, configure and run the web server void http_thread(void const* arg) { + // Init the web server pc.printf("Starting web server\r\n"); char* baseWebFolder = "/sd/"; // should be /sd/ for SDcard files - not used for local file system RdWebServer webServer; + + // Add commands to handle the home page and favicon webServer.addCommand("", RdWebServerCmdDef::CMD_LOCALFILE, NULL, "index.htm", true); webServer.addCommand("favicon.ico", RdWebServerCmdDef::CMD_LOCALFILE, NULL, NULL, true); + + // Add the lightwall control commands webServer.addCommand("cmd", RdWebServerCmdDef::CMD_CALLBACK, &lightwallCmd); + webServer.addCommand("name", RdWebServerCmdDef::CMD_CALLBACK, &lightwallGetSystemName); + + // Start the server webServer.init(WEBPORT, &led4, baseWebFolder); webServer.run(); } +void getSystemConfig() +{ + printf("LightWall - Configured for "); + // Check for a config file on the local file system + strcpy(systemName, "Spidey"); + LocalFileSystem local("local"); + FILE* fp = fopen("/local/lights.txt", "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; + // Read config details from the file + sscanf(buf, "%s %d %d", systemName, &systemNumLEDS, &systemLEDSSplitPoint); + } + fclose(fp); + printf("%s (%d LEDs, Split at %d)", systemName, systemNumLEDS, systemLEDSSplitPoint); + printf("\r\n"); + } +} + int main() { // Init pc.baud(115200); pc.printf("Light Wall - Rob Dobson 2015\r\n"); + + // Get the configuration of the system + getSystemConfig(); + + // Drawing manager controls the LEDs + drawingManager.init(systemNumLEDS, systemLEDSSplitPoint); // Setup ethernet interface char macAddr[6]; @@ -215,16 +262,12 @@ pc.printf("IP Address: %s\r\n", EthernetInterface::getIPAddress()); // Web Server - Thread httpServer(&http_thread, NULL, osPriorityNormal, (DEFAULT_STACK_SIZE * 4)); + Thread httpServer(&http_thread, NULL, osPriorityNormal, (DEFAULT_STACK_SIZE * 3)); - // Home - drawingManager.init(); - + // Forever while(true) { -// led1=!led1; // Service drawing manager drawingManager.service(); -// Thread::wait(500); } }