FreeRTOS-Kernel/Demo/ARM7_AT91SAM7X256_Eclipse/RTOSDemo/webserver/EMAC_ISR.c

/*
    FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.

    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
    source code for proprietary components outside of the FreeRTOS kernel.
    Alternative commercial license and support terms are also available upon
    request.  See the licensing section of http://www.FreeRTOS.org for full
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    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
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    You should have received a copy of the GNU General Public License along
    with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
    Temple Place, Suite 330, Boston, MA  02111-1307  USA.


    ***************************************************************************
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    Please ensure to read the configuration and relevant port sections of the
    online documentation.

    http://www.FreeRTOS.org - Documentation, latest information, license and
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*/

#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"

/* Wrapper for the EMAC interrupt. */
void vEMACISR_Wrapper( void ) __attribute__((naked));

/* Handler called by the ISR wrapper.  This must be kept a separate
function to ensure the stack frame is correctly set up. */
void vEMACISR_Handler( void ) __attribute__((noinline));

static xSemaphoreHandle xEMACSemaphore;

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

void vPassEMACSemaphore( xSemaphoreHandle xSemaphore )
{
	xEMACSemaphore = xSemaphore;
}
/*-----------------------------------------------------------*/

void vEMACISR_Handler( void )
{
volatile unsigned long ulIntStatus, ulRxStatus;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

	ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR;
	ulRxStatus = AT91C_BASE_EMAC->EMAC_RSR;

	if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulRxStatus & AT91C_EMAC_REC ) )
	{
		/* A frame has been received, signal the uIP task so it can process
		the Rx descriptors. */
		xSemaphoreGiveFromISR( xEMACSemaphore, &xHigherPriorityTaskWoken );
		AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC;
	}

	/* Clear the interrupt. */
	AT91C_BASE_AIC->AIC_EOICR = 0;
	
    /* Switch to the uIP task. */
    if( xHigherPriorityTaskWoken )
    {
    	/* If a task of higher priority than the interrupted task was
    	unblocked by the ISR then this call will ensure that the 
    	unblocked task is the task the ISR returns to. */
    	portYIELD_FROM_ISR();
    }
}
/*-----------------------------------------------------------*/

void vEMACISR_Wrapper( void )
{
	/* Save the context of the interrupted task. */
	portSAVE_CONTEXT();
	
	/* Call the handler task to do the actual work.  This must be a separate
	function to ensure the stack frame is correctly set up. */
	__asm volatile ("bl vEMACISR_Handler");
	
	/* Restore the context of whichever task is the next to run. */
	portRESTORE_CONTEXT();
}