realtime_webpage.c

embedded_ethernet_complete_code_rabbit

// The Rabbit serves a Web page that displays how long the current application
// has been running.
// The application uses the server-side-include (SSI) #echo directive to insert
// the current values of time variables on the page.

// This file and other embedded Ethernet and Internet code and resources are
// available from www.Lvr.com.

// Select a network configuration from \lib\tcpip\tcp_config.lib
// in the Dynamic C distribution.
#define TCPCONFIG 1

// All C functions not declared as root go to extended memory.
#memmap xmem

// The dcrtcp library supports IP and TCP; the http library supports HTTP functions.
#use "dcrtcp.lib"
#use "http.lib"

// ximport loads a file from the development PC into the Rabbit's flash memory.
// The symbol (index_html) is a macro that gives the file's length and
// physical address in the Rabbit's memory.

// YOU MUST CHANGE THE PATH to match the location of the file in your system.
// OK to use forward or back slashes as separators.
#ximport "c:\embedded_ethernet_code\rabbit\realtimewebpage\index.shtml" index_html

// The HttpType structure names the handler to use with specific file extensions.
// The first item in the structure is the handler used when a request
// doesn't name a page or other resource.
// This structure has just one handler, which handles HTML pages that include
// SSI directives.
const HttpType http_types[] = {
   { ".shtml", "text/html", shtml_handler},
};

// The time variables to display on the Web page.
unsigned long days;
unsigned long seconds;
unsigned long hours;
unsigned long minutes;

// The HttpSpec structure contains information about the files, variables,
// and structures the Web server can access.

// On receiving a request for the file index.shtml or a request with no file
// name specified, the Web server serves the page that the index_html macro
// points to.
// The Web server can also access four variables that contain time information.
const HttpSpec http_flashspec[] =
{
   { HTTPSPEC_FILE,  "/",              index_html,    NULL, 0, NULL, NULL},
   { HTTPSPEC_FILE,  "/index.shtml",   index_html,    NULL, 0, NULL, NULL},

   { HTTPSPEC_VARIABLE, "days",          0,    &days, INT32,   "%d", NULL},
   { HTTPSPEC_VARIABLE, "hours",         0,    &hours, INT32,   "%d", NULL},
   { HTTPSPEC_VARIABLE, "minutes",       0,    &minutes, INT32,   "%d", NULL},
   { HTTPSPEC_VARIABLE, "seconds",       0,    &seconds, INT32,   "%d", NULL},
};

main() {

	// Update the time variables periodically and wait for and respond to
   // requests for the Web page.

   unsigned long start_time;
   unsigned long total_seconds;

	// Initialize the TCP/IP stack and Web server.
   sock_init();
   http_init();

   // For improved performance, reserve port 80 for the Web server.
   tcp_reserveport(80);

   // Get an initial seconds count for measuring elapsed time.
   start_time = SEC_TIMER;

	// An infinite while loop upates the time variables once per second
	// and calls http_handler to process network requests. Code to perform
	// other tasks can be placed in the loop as well.
   while (1) {

   	// http_handler must be called periodically to process HTTP requests.
      http_handler();

  		costate {

			// Wait DelaySec seconds between updates.
			waitfor(DelaySec(1));

			// Update the uptime value.
			// Get the elapsed time in seconds since the program began running.
   	   total_seconds = SEC_TIMER - start_time;

   	   // For the number of days, divide by the number of seconds per day.
			days = total_seconds /86400;

			// For the number of hours excluding full days, divide the total hours
			// by the number of hours per day and use the remainder.
			hours = (total_seconds / 3600) % 24;

			// For the number of minutes excluding full hours, divide the total minutes
			// by the number of minutes per hour and use the remainder.
			minutes = (total_seconds / 60) % 60;

			// For the number of seconds excluding full minutes, divide the elapsed time
			// by the number of seconds per minute and use the remainder.
			seconds = total_seconds % 60;

     	} // end costate

      // Can place code to perform other tasks here.

   } // end while (1)
} // end main()