/*
    FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
	

    ***************************************************************************
     *                                                                       *
     *    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 Richard Barry, 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, training, latest information, 
    license and contact details.
    
    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool.

    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.OpenRTOS.com.  High Integrity Systems also
    provide a safety engineered and independently SIL3 certified version under 
    the SafeRTOS brand: http://www.SafeRTOS.com.
*/

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* Constants required for interrupt management. */
#define tcpCLEAR_VIC_INTERRUPT	( 0 )
#define tcpEINT0_VIC_CHANNEL_BIT	( ( unsigned long ) 0x4000 )

/* EINT0 interrupt handler.  This processes interrupts from the WIZnet device. */
void vEINT0_ISR_Wrapper( void ) __attribute__((naked));

/* The handler that goes with the EINT0 wrapper. */
void vEINT0_ISR_Handler( void );

/* Variable is required for its address, but does not otherwise get used. */
static long lDummyVariable;

/*
 * When the WIZnet device asserts an interrupt we send an (empty) message to
 * the TCP task.  This wakes the task so the interrupt can be processed.  The
 * source of the interrupt has to be ascertained by the TCP task as this 
 * requires an I2C transaction which cannot be performed from this ISR.
 * Note this code predates the introduction of semaphores, a semaphore should
 * be used in place of the empty queue message.
 */
void vEINT0_ISR_Handler( void )
{
extern xQueueHandle xTCPISRQueue;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

	/* Just wake the TCP task so it knows an ISR has occurred. */
	xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken );	

	/* We cannot carry on processing interrupts until the TCP task has 
	processed this one - so for now interrupts are disabled.  The TCP task will
	re-enable it. */
	VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT;

	/* Clear the interrupt bit. */	
	VICVectAddr = tcpCLEAR_VIC_INTERRUPT;

	if( xHigherPriorityTaskWoken )
	{
		portYIELD_FROM_ISR();
	}
}
/*-----------------------------------------------------------*/

void vEINT0_ISR_Wrapper( void )
{
	/* Save the context of the interrupted task. */
	portSAVE_CONTEXT();

	/* The handler must be a separate function from the wrapper to
	ensure the correct stack frame is set up. */
	vEINT0_ISR_Handler();

	/* Restore the context of whichever task is going to run next. */
	portRESTORE_CONTEXT();
}