httpdemo.c

freescale k40/k60 freertos-lwip例程

/*
    FreeRTOS V6.0.4 - Copyright (C) 2010 Real Time Engineers Ltd.

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    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
    ***NOTE*** The exception to the GPL is included to allow you to distribute
    a combined work that includes FreeRTOS without being obliged to provide the
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    License and the FreeRTOS license exception along with FreeRTOS; if not it 
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*/

/*
    Implements a simplistic WEB server.  Every time a connection is made and
    data is received a dynamic page that shows the current TCP/IP statistics
    is generated and returned.  The connection is then closed.

    This file was adapted from a FreeRTOS lwIP slip demo supplied by a third
    party.
*/

/* ------------------------ System includes ------------------------------- */


/* ------------------------ FreeRTOS includes ----------------------------- */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

/* ------------------------ lwIP includes --------------------------------- */
#include "lwip/api.h"
#include "lwip/tcpip.h"
#include "lwip/ip.h"
#include "lwip/memp.h"
#include "lwip/stats.h"
#include "netif/loopif.h"

/* ------------------------ Project includes ------------------------------ */
#include "common.h"
#include <string.h>

#include "HTTPDemo.h"

/* ------------------------ Defines --------------------------------------- */
/* The size of the buffer in which the dynamic WEB page is created. */
#define webMAX_PAGE_SIZE        ( 1024 ) /*FSL: buffer containing array*/

/* Standard GET response. */
#define webHTTP_OK  "HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n"

/* The port on which we listen. */
#define webHTTP_PORT            ( 80 )

/* Delay on close error. */
#define webSHORT_DELAY          ( 10 )

/* Format of the dynamic page that is returned on each connection. */
#define webHTML_START \
"<html>\
<head>\
</head>\
<BODY onLoad=\"window.setTimeout(&quot;location.href='index.html'&quot;,1000)\"bgcolor=\"#CCCCff\">\
\r\n\r\nPage Hits = "

#define webHTML_END \
"\r\n" \
"</pre>\r\n" \
"</BODY>\r\n" \
"</html>"

#if INCLUDE_uxTaskGetStackHighWaterMark
	static volatile unsigned portBASE_TYPE uxHighWaterMark_web = 0;
#endif

/* ------------------------ Prototypes ------------------------------------ */
static void     vProcessConnection( struct netconn *pxNetCon );

/*------------------------------------------------------------------------------*/
/*                            GLOBALS                                          */
/*------------------------------------------------------------------------------*/
static struct netif ENET_if;

/*
 * Process an incoming connection on port 80.
 *
 * This simply checks to see if the incoming data contains a GET request, and
 * if so sends back a single dynamically created page.  The connection is then
 * closed.  A more complete implementation could create a task for each
 * connection.
 */
static void vProcessConnection( struct netconn *pxNetCon )
{
    static portCHAR cDynamicPage[webMAX_PAGE_SIZE], cPageHits[11];
    struct netbuf  *pxRxBuffer;
    portCHAR       *pcRxString;
    unsigned portSHORT usLength;
    static unsigned portLONG ulPageHits = 0;

    /* We expect to immediately get data. */
    pxRxBuffer = netconn_recv( pxNetCon );

    if( pxRxBuffer != NULL )
    {
        /* Where is the data? */
        netbuf_data( pxRxBuffer, ( void * )&pcRxString, &usLength );

        /* Is this a GET?  We don't handle anything else. */
        if( !strncmp( pcRxString, "GET", 3 ) )
        {
            pcRxString = cDynamicPage;

            /* Update the hit count. */
            ulPageHits++;
            sprintf( cPageHits, "%d", (int)ulPageHits );

            /* Write out the HTTP OK header. */            
            netconn_write( pxNetCon, webHTTP_OK, ( u16_t ) strlen( webHTTP_OK ), NETCONN_COPY );

            /* Generate the dynamic page...
            
               ... First the page header. */
            strcpy( cDynamicPage, webHTML_START );
            /* ... Then the hit count... */
            strcat( cDynamicPage, cPageHits );
            
            strcat( cDynamicPage,
                    "<p><pre>Task          State  Priority  Stack      #<br>************************************************<br>" );
            /* ... Then the list of tasks and their status... */
            vTaskList( ( signed portCHAR * )cDynamicPage + strlen( cDynamicPage ) );            
            
            /* ... Finally the page footer. */
            strcat( cDynamicPage, webHTML_END );

            /* Write out the dynamically generated page. */
            netconn_write( pxNetCon, cDynamicPage, ( u16_t ) strlen( cDynamicPage ), NETCONN_COPY );
        }
        netbuf_delete( pxRxBuffer );
    }
    netconn_close( pxNetCon );
}

/*------------------------------------------------------------*/

void vlwIPInit( void )
{
    /* Initialize lwIP and its interface layer. */
    tcpip_init( NULL, NULL );
}

/*------------------------------------------------------------*/

void vBasicWEBServer( void *pvParameters )
{
    struct netconn *pxHTTPListener, *pxNewConnection;
    struct ip_addr  xIpAddr, xNetMast, xGateway;
    extern err_t ethernetif_init( struct netif *netif );

    /* Parameters are not used - suppress compiler error. */
    ( void )pvParameters;

	vlwIPInit();

    /* Create and configure the FEC interface. */
    IP4_ADDR( &xIpAddr, configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
    IP4_ADDR( &xNetMast, configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 );
    IP4_ADDR( &xGateway, configGW_ADDR0, configGW_ADDR1, configGW_ADDR2, configGW_ADDR3 );
    netif_add( &ENET_if, &xIpAddr, &xNetMast, &xGateway, NULL, ethernetif_init, tcpip_input );

    /* make it the default interface */
    netif_set_default( &ENET_if );

    /* bring it up */
    netif_set_up( &ENET_if );

    /* Create a new tcp connection handle */
    pxHTTPListener = netconn_new( NETCONN_TCP );
    netconn_bind( pxHTTPListener, NULL, webHTTP_PORT );
    netconn_listen( pxHTTPListener );

    /* Loop forever */
    for( ;; )
    {	
        /* Wait for connection. */
        pxNewConnection = netconn_accept( pxHTTPListener );

        if( pxNewConnection != NULL )
        {
            /* Service connection. */
            vProcessConnection( pxNewConnection );
            while( netconn_delete( pxNewConnection ) != ERR_OK )
            {
                vTaskDelay( webSHORT_DELAY );
            }
        }
    }
}