📄 httptask.c
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/*
FreeRTOS.org V4.2.0 - Copyright (C) 2003-2007 Richard Barry.
This file is part of the FreeRTOS.org distribution.
FreeRTOS.org is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS.org is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FreeRTOS.org; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS.org, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
See http://www.FreeRTOS.org for documentation, latest information, license
and contact details. Please ensure to read the configuration and relevant
port sections of the online documentation.
***************************************************************************
*/
/*
* Very simple task that responds with a single WEB page to http requests.
*
* The WEB page displays task and system status. A semaphore is used to
* wake the task when there is processing to perform as determined by the
* interrupts generated by the Ethernet interface.
*/
/* Standard includes. */
#include <string.h>
#include <stdio.h>
/* Tern includes. */
#include "utils\system_common.h"
#include "i2chip_hw.h"
#include "socket.h"
/* FreeRTOS.org includes. */
#include <FreeRTOS.h>
#include <task.h>
#include <semphr.h>
/* The standard http port on which we are going to listen. */
#define httpPORT 80
#define httpTX_WAIT 2
/* Network address configuration. */
const unsigned portCHAR ucMacAddress[] = { 12, 128, 12, 34, 56, 78 };
const unsigned portCHAR ucGatewayAddress[] = { 192, 168, 2, 1 };
const unsigned portCHAR ucIPAddress[] = { 172, 25, 218, 210 };
const unsigned portCHAR ucSubnetMask[] = { 255, 255, 255, 0 };
/* The number of sockets this task is going to handle. */
#define httpSOCKET_NUM 3
unsigned portCHAR ucConnection[ httpSOCKET_NUM ];
/* The maximum data buffer size we can handle. */
#define httpSOCKET_BUFFER_SIZE 2048
/* Standard HTTP response. */
#define httpOUTPUT_OK "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n"
/* Hard coded HTML components. Other data is generated dynamically. */
#define HTML_OUTPUT_BEGIN "\
<HTML><head><meta http-equiv=\"Refresh\" content=\"1\;url=index.htm\"></head>\
<BODY bgcolor=\"#CCCCFF\"><font face=\"arial\"><H2>FreeRTOS.org<sup>tm</sup> + Tern E-Engine<sup>tm</sup></H2>\
<a href=\"http:\/\/www.FreeRTOS.org\">FreeRTOS.org Homepage</a><P>\
<HR>Task status table:\r\n\
<p><font face=\"courier\"><pre>Task State Priority Stack #<br>\
************************************************<br>"
#define HTML_OUTPUT_END "\
</font></BODY></HTML>"
/*-----------------------------------------------------------*/
/*
* Initialise the data structures used to hold the socket status.
*/
static void prvHTTPInit( void );
/*
* Setup the Ethernet interface with the network addressing information.
*/
static void prvNetifInit( void );
/*
* Generate the dynamic components of the served WEB page and transmit the
* entire page through the socket.
*/
static void prvTransmitHTTP( unsigned portCHAR socket );
/*-----------------------------------------------------------*/
/* This variable is simply incremented by the idle task hook so the number of
iterations the idle task has performed can be displayed as part of the served
page. */
unsigned portLONG ulIdleLoops = 0UL;
/* Data buffer shared by sockets. */
unsigned portCHAR ucSocketBuffer[ httpSOCKET_BUFFER_SIZE ];
/* The semaphore used by the Ethernet ISR to signal that the task should wake
and process whatever caused the interrupt. */
xSemaphoreHandle xTCPSemaphore = NULL;
/*-----------------------------------------------------------*/
void vHTTPTask( void * pvParameters )
{
portSHORT i, sLen;
unsigned portCHAR ucState;
( void ) pvParameters;
/* Create the semaphore used to communicate between this task and the
WIZnet ISR. */
vSemaphoreCreateBinary( xTCPSemaphore );
/* Make sure everything is setup before we start. */
prvNetifInit();
prvHTTPInit();
for( ;; )
{
/* Wait until the ISR tells us there is something to do. */
xSemaphoreTake( xTCPSemaphore, portMAX_DELAY );
/* Check each socket. */
for( i = 0; i < httpSOCKET_NUM; i++ )
{
ucState = select( i, SEL_CONTROL );
switch (ucState)
{
case SOCK_ESTABLISHED : /* new connection established. */
if( ( sLen = select( i, SEL_RECV ) ) > 0 )
{
if( sLen > httpSOCKET_BUFFER_SIZE )
{
sLen = httpSOCKET_BUFFER_SIZE;
}
disable();
sLen = recv( i, ucSocketBuffer, sLen );
if( ucConnection[ i ] == 1 )
{
/* This is our first time processing a HTTP
request on this connection. */
prvTransmitHTTP( i );
ucConnection[i] = 0;
}
enable();
}
break;
case SOCK_CLOSE_WAIT :
close(i);
break;
case SOCK_CLOSED :
ucConnection[i] = 1;
socket( i, SOCK_STREAM, 80, 0x00 );
NBlisten( i ); /* reinitialize socket. */
break;
}
}
}
}
/*-----------------------------------------------------------*/
static void prvHTTPInit( void )
{
unsigned portCHAR ucIndex;
/* There are 4 total sockets available; we will claim 3 for HTTP. */
for(ucIndex = 0; ucIndex < httpSOCKET_NUM; ucIndex++)
{
socket( ucIndex, SOCK_STREAM, httpPORT, 0x00 );
NBlisten( ucIndex );
ucConnection[ ucIndex ] = 1;
}
}
/*-----------------------------------------------------------*/
static void prvNetifInit( void )
{
i2chip_init();
initW3100A();
setMACAddr( ( unsigned portCHAR * ) ucMacAddress );
setgateway( ( unsigned portCHAR * ) ucGatewayAddress );
setsubmask( ( unsigned portCHAR * ) ucSubnetMask );
setIP( ( unsigned portCHAR * ) ucIPAddress );
/* See definition of 'sysinit' in socket.c
- 8 KB transmit buffer, and 8 KB receive buffer available. These buffers
are shared by all 4 channels.
- (0x55, 0x55) configures the send and receive buffers at
httpSOCKET_BUFFER_SIZE bytes for each of the 4 channels. */
sysinit( 0x55, 0x55 );
}
/*-----------------------------------------------------------*/
static void prvTransmitHTTP(unsigned portCHAR socket)
{
extern portSHORT usCheckStatus;
/* Send the http and html headers. */
send( socket, ( unsigned portCHAR * ) httpOUTPUT_OK, strlen( httpOUTPUT_OK ) );
send( socket, ( unsigned portCHAR * ) HTML_OUTPUT_BEGIN, strlen( HTML_OUTPUT_BEGIN ) );
/* Generate then send the table showing the status of each task. */
vTaskList( ucSocketBuffer );
send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
/* Send the number of times the idle task has looped. */
sprintf( ucSocketBuffer, "</pre></font><p><br>The idle task has looped 0x%08lx times<br>", ulIdleLoops );
send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
/* Send the tick count. */
sprintf( ucSocketBuffer, "The tick count is 0x%08lx<br>", xTaskGetTickCount() );
send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
/* Show a message indicating whether or not the check task has discovered
an error in any of the standard demo tasks. */
if( usCheckStatus == 0 )
{
sprintf( ucSocketBuffer, "No errors detected." );
send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
}
else
{
sprintf( ucSocketBuffer, "<font color=\"red\">An error has been detected in at least one task %x.</font><p>", usCheckStatus );
send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
}
/* Finish the page off. */
send( socket, (unsigned portCHAR*)HTML_OUTPUT_END, strlen(HTML_OUTPUT_END));
/* Must make sure the data is gone before closing the socket. */
while( !tx_empty( socket ) )
{
vTaskDelay( httpTX_WAIT );
}
close(socket);
}
/*-----------------------------------------------------------*/
void vApplicationIdleHook( void )
{
ulIdleLoops++;
}
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