/*
    FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    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 modification to the GPL is included to allow you to
    distribute a combined work that includes FreeRTOS without being obliged to
    provide the source code for proprietary components outside of the FreeRTOS
    kernel.

    FreeRTOS 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
    and the FreeRTOS license exception along with FreeRTOS; if not it can be
    viewed here: http://www.freertos.org/a00114.html and also obtained by
    writing to Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************


    http://www.FreeRTOS.org - Documentation, books, training, latest versions, 
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, and our new
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
    indemnification and middleware, under the OpenRTOS brand.
    
    http://www.SafeRTOS.com - High Integrity Systems also provide a safety 
    engineered and independently SIL3 certified version for use in safety and 
    mission critical applications that require provable dependability.
*/

/* Standard includes. */
#include <string.h>

/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "timers.h"

/* uip includes. */
#include "net/uip.h"
#include "net/uip_arp.h"
#include "apps/httpd/httpd.h"
#include "sys/timer.h"
#include "net/clock-arch.h"
#include "emac.h"

/* Demo includes. */
#include "ParTest.h"

/* The buffer used by the uIP stack to both receive and send.  In this case,
because the Ethernet driver is implemented to be zero copy - the uip_buf
variable is just a pointer to an Ethernet buffer, and not a buffer in its own
right. */
extern unsigned char *uip_buf;

/* The ARP timer and the periodic timer share a callback function, so the
respective timer IDs are used to determine which timer actually expired.  These
constants are assigned to the timer IDs. */
#define uipARP_TIMER				0
#define uipPERIODIC_TIMER			1

/* The length of the queue used to send events from timers or the Ethernet
driver to the uIP stack. */
#define uipEVENT_QUEUE_LENGTH		10

/* A block time of zero simply means "don't block". */
#define uipDONT_BLOCK				0UL

/* Shortcut to the header within the Rx buffer. */
#define xHeader ((struct uip_eth_hdr *) &uip_buf[ 0 ])

/*-----------------------------------------------------------*/

/*
 * Setup the MAC address in the MAC itself, and in the uIP stack.
 */
static void prvSetMACAddress( void );

/*
 * Perform any uIP initialisation required to ready the stack for http
 * processing.
 */
static void prvInitialise_uIP( void );

/*
 * The callback function that is assigned to both the periodic timer and the
 * ARP timer.
 */
static void prvUIPTimerCallback( xTimerHandle xTimer );

/*
 * Port functions required by the uIP stack.
 */
clock_time_t clock_time( void );

/*-----------------------------------------------------------*/

/* The queue used to send TCP/IP events to the uIP stack. */
xQueueHandle xEMACEventQueue = NULL;

/*-----------------------------------------------------------*/

clock_time_t clock_time( void )
{
	return xTaskGetTickCount();
}
/*-----------------------------------------------------------*/

void vuIP_Task( void *pvParameters )
{
long i;
unsigned long ulNewEvent = 0UL, ulUIP_Events = 0UL;
unsigned short usPacketLength;

	/* Just to prevent compiler warnings about the unused parameter. */
	( void ) pvParameters;

	/* Initialise the uIP stack, configuring for web server usage. */
	prvInitialise_uIP();

	/* Initialise the MAC and PHY. */
	vEMACInit();

	for( ;; )
	{
		/* Is there received data ready to be processed? */
		usPacketLength = usEMACRead();

		/* Statements to be executed if data has been received on the Ethernet. */
		if( ( usPacketLength > 0U ) && ( uip_buf != NULL ) )
		{
			uip_len = usPacketLength;
			
			if( xHeader->type == htons( UIP_ETHTYPE_IP ) )
			{
				uip_arp_ipin();
				uip_input();

				/* If the above function invocation resulted in data that
				should be sent out on the network, the global variable
				uip_len is set to a value > 0. */
				if( uip_len > 0 )
				{
					uip_arp_out();
					vEMACWrite();
				}
			}
			else if( xHeader->type == htons( UIP_ETHTYPE_ARP ) )
			{
				uip_arp_arpin();

				/* If the above function invocation resulted in data that
				should be sent out on the network, the global variable
				uip_len is set to a value > 0. */
				if( uip_len > 0 )
				{
					vEMACWrite();
				}
			}
		}
		else
		{
			/* Clear the RX event latched in ulUIP_Events - if one was latched. */
			ulUIP_Events &= ~uipETHERNET_RX_EVENT;
		}

		/* Statements to be executed if the TCP/IP period timer has expired. */
		if( ( ulUIP_Events & uipPERIODIC_TIMER_EVENT ) != 0UL )
		{
			ulUIP_Events &= ~uipPERIODIC_TIMER_EVENT;

			if( uip_buf != NULL )
			{
				for( i = 0; i < UIP_CONNS; i++ )
				{
					uip_periodic( i );
	
					/* If the above function invocation resulted in data that
					should be sent out on the network, the global variable
					uip_len is set to a value > 0. */
					if( uip_len > 0 )
					{
						uip_arp_out();
						vEMACWrite();
					}
				}
			}
		}

		/* Statements to be executed if the ARP timer has expired. */
		if( ( ulUIP_Events & uipARP_TIMER_EVENT ) != 0 )
		{
			ulUIP_Events &= ~uipARP_TIMER_EVENT;
			uip_arp_timer();
		}

		/* If all latched events have been cleared - block until another event
		occurs. */
		if( ulUIP_Events == pdFALSE )
		{
			xQueueReceive( xEMACEventQueue, &ulNewEvent, portMAX_DELAY );
			ulUIP_Events |= ulNewEvent;
		}
	}
}
/*-----------------------------------------------------------*/

static void prvSetMACAddress( void )
{
struct uip_eth_addr xAddr;

	/* Configure the MAC address in the uIP stack. */
	xAddr.addr[ 0 ] = configMAC_ADDR0;
	xAddr.addr[ 1 ] = configMAC_ADDR1;
	xAddr.addr[ 2 ] = configMAC_ADDR2;
	xAddr.addr[ 3 ] = configMAC_ADDR3;
	xAddr.addr[ 4 ] = configMAC_ADDR4;
	xAddr.addr[ 5 ] = configMAC_ADDR5;
	uip_setethaddr( xAddr );
}
/*-----------------------------------------------------------*/

static void prvInitialise_uIP( void )
{
uip_ipaddr_t xIPAddr;
xTimerHandle xARPTimer, xPeriodicTimer;

	uip_init();
	uip_ipaddr( &xIPAddr, configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
	uip_sethostaddr( &xIPAddr );
	uip_ipaddr( &xIPAddr, configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 );
	uip_setnetmask( &xIPAddr );
	prvSetMACAddress();
	httpd_init();

	/* Create the queue used to sent TCP/IP events to the uIP stack. */
	xEMACEventQueue = xQueueCreate( uipEVENT_QUEUE_LENGTH, sizeof( unsigned long ) );

	/* Create and start the uIP timers. */
	xARPTimer = xTimerCreate( 	( signed char * ) "ARPTimer", /* Just a name that is helpful for debugging, not used by the kernel. */
								( 10000UL / portTICK_RATE_MS ), /* Timer period. */
								pdTRUE, /* Autor-reload. */
								( void * ) uipARP_TIMER,
								prvUIPTimerCallback
							);

	xPeriodicTimer = xTimerCreate( 	( signed char * ) "PeriodicTimer",
									( 500UL / portTICK_RATE_MS ),
									pdTRUE, /* Autor-reload. */
									( void * ) uipPERIODIC_TIMER,
									prvUIPTimerCallback
								);

	/* Sanity check that the timers were indeed created. */
	configASSERT( xARPTimer );
	configASSERT( xPeriodicTimer );
	configASSERT( xEMACEventQueue );

	/* These commands will block indefinitely until they succeed, so there is
	no point in checking their return values. */
	xTimerStart( xARPTimer, portMAX_DELAY );
	xTimerStart( xPeriodicTimer, portMAX_DELAY );
}
/*-----------------------------------------------------------*/

static void prvUIPTimerCallback( xTimerHandle xTimer )
{
static const unsigned long ulARPTimerExpired = uipARP_TIMER_EVENT;
static const unsigned long ulPeriodicTimerExpired = uipPERIODIC_TIMER_EVENT;

	/* This is a time callback, so calls to xQueueSend() must not attempt to
	block.  As this callback is assigned to both the ARP and Periodic timers, the
	first thing to do is ascertain which timer it was that actually expired. */
	switch( ( int ) pvTimerGetTimerID( xTimer ) )
	{
		case uipARP_TIMER		:	xQueueSend( xEMACEventQueue, &ulARPTimerExpired, uipDONT_BLOCK );
									break;

		case uipPERIODIC_TIMER	:	xQueueSend( xEMACEventQueue, &ulPeriodicTimerExpired, uipDONT_BLOCK );
									break;

		default					:  	/* Should not get here. */
									break;
	}
}
/*-----------------------------------------------------------*/

void vApplicationProcessFormInput( char *pcInputString )
{
char *c;
const unsigned long ulYellowLED = 2UL;

	/* Only interested in processing form input if this is the IO page. */
	c = strstr( pcInputString, "io.shtml" );
	
	if( c )
	{
		/* Is there a command in the string? */
		c = strstr( pcInputString, "?" );
	    if( c )
	    {
			/* Turn the LEDs on or off in accordance with the check box status. */
			if( strstr( c, "LED0=1" ) != NULL )
			{
				/* Turn the LEDs on. */
				vParTestSetLED( ulYellowLED, pdTRUE );
			}
			else
			{
				/* Turn the LEDs off. */
				vParTestSetLED( ulYellowLED, pdFALSE );
			}
	    }
		else
		{
			/* Some browsers will only imply that a check box is off. */
			vParTestSetLED( ulYellowLED, pdFALSE );
		}
	}
}
/*-----------------------------------------------------------*/